/src/wireshark/epan/dissectors/packet-ospf.c

Source
/* packet-ospf.c
 * Routines for OSPF packet disassembly
 * (c) Copyright Hannes R. Boehm <hannes@boehm.org>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */
/*
 * At this time, this module is able to analyze OSPF
 * packets as specified in RFC2328. MOSPF (RFC1584) and other
 * OSPF Extensions which introduce new Packet types
 * (e.g the External Attributes LSA) are not supported.
 * Furthermore RFC2740 (OSPFv3 - OSPF for IPv6) is now supported
 *   - (c) 2001 Palle Lyckegaard <palle[AT]lyckegaard.dk>
 *
 * Added support to E-NNI routing (OIF2003.259.02)
 *   - (c) 2004 Roberto Morro <roberto.morro[AT]tilab.com>
 *
 * Added support for OSPF restart signaling:
 *       draft-nguyen-ospf-lls-05.txt
 *       draft-nguyen-ospf-oob-resync-05.txt
 *       draft-nguyen-ospf-restart-05.txt
 *   - (c) 2005 Michael Rozhavsky <mrozhavsky@fortinet.com>
 *
 * Added support of MPLS Diffserv-aware TE (RFC 4124); new BC sub-TLV
 *   - (c) 2006 (FF) <francesco.fondelli[AT]gmail.com>
 *
 * Added support for decoding the TLVs in a grace-LSA
 *   - (c) 2007 Todd J Martin <todd.martin@acm.org>
 *
 * Added support for draft-ietf-ospf-manet-or-02
 * Added support for draft-ietf-ospf-af-alt-06
 *   - (c) 2008 Cisco Systems
 *
 * Added support for Multi-Topology (MT) Routing (RFC4915)
 *   - (c) 2009 Stig Bjorlykke <stig@bjorlykke.org>, Thales Norway AS
 *
 * Added support for OSPFv2 & OSPFv3 Router Information (RI) Opaque LSA (RFC4970); RI Capabilities TLV
 * Added support for OSPFv2 & OSPFv3 Dynamic Hostname TLV in RI Opaque LSA (RFC5642)
 *   - (c) 2011 Salil Kanitkar <sskanitk@ncsu.edu>, North Carolina State University
 *
 * Added support for Type Classification of Experimental and Reserved sub-TLVs (RFC3630)
 *   - (c) 2013 Kaushal Shah <kshah3@ncsu.edu>, North Carolina State University
 *
 * Added support for Authentication Trailer for OSPFv3 (RFC6506)
 *   - (c) 2014 Alexis La Goutte (See AUTHORS)
 *
 * Added support for optical spectrum occupation for fixed grid WDM links (RFC 7688)
 * Added support for optical spectrum occupation for flexi grid WDM links (RFC 8363)
 *   - (c) 2018 Julien Meuric <julien.meuric@orange.com>
 *   - (c) 2018 Khalifa Ndiaye <khalifa.ndiaye@orange.com>
 *
 * Added support for OSPFv3 Link State Advertisement Extensibility (RFC 8362)
 *   - (c) 2024 Jacob Lodge
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/tfs.h>
#include <epan/capture_dissectors.h>
#include <epan/in_cksum.h>
#include <epan/expert.h>
#include <epan/addr_resolv.h>
#include <epan/unit_strings.h>
#include <epan/iana-info.h>

#include <wsutil/ws_roundup.h>
#include <wsutil/ws_padding_to.h>

#include "packet-rsvp.h"

void proto_register_ospf(void);
void proto_reg_handoff_ospf(void);

static dissector_handle_t ospf_handle;
static capture_dissector_handle_t ospf_cap_handle;

/* Preferences */
static bool ospf_v3_expect_at = false;

#define OSPF_VERSION_2 2
#define OSPF_VERSION_3 3
#define OSPF_AF_4 4
#define OSPF_AF_6 6
#define OSPF_VERSION_2_HEADER_LENGTH    24
#define OSPF_VERSION_3_HEADER_LENGTH    16


#define OSPF_HELLO      1
#define OSPF_DB_DESC    2
#define OSPF_LS_REQ     3
#define OSPF_LS_UPD     4
#define OSPF_LS_ACK     5
#define OSPF_LS_BASE    OSPF_HELLO

static const value_string pt_vals[] = {
    {OSPF_HELLO,   "Hello Packet"   },
    {OSPF_DB_DESC, "DB Description" },
    {OSPF_LS_REQ,  "LS Request"     },
    {OSPF_LS_UPD,  "LS Update"      },
    {OSPF_LS_ACK,  "LS Acknowledge" },
    {0,             NULL            }
};

static const value_string ospf_at_authentication_type_vals[] = {
    {0, "Reserved" },
    {1, "HMAC Cryptographic Authentication" },
    {0, NULL }
};

#define OSPF_AUTH_NONE          0
#define OSPF_AUTH_SIMPLE        1
#define OSPF_AUTH_CRYPT         2

static const value_string auth_vals[] = {
    {OSPF_AUTH_NONE,   "Null"            },
    {OSPF_AUTH_SIMPLE, "Simple password" },
    {OSPF_AUTH_CRYPT,  "Cryptographic"   },
    {0,                NULL              }
};

#define OSPF_V2_OPTIONS_MT              0x01
#define OSPF_V2_OPTIONS_E               0x02
#define OSPF_V2_OPTIONS_MC              0x04
#define OSPF_V2_OPTIONS_NP              0x08
#define OSPF_V2_OPTIONS_L               0x10
#define OSPF_V2_OPTIONS_DC              0x20
#define OSPF_V2_OPTIONS_O               0x40
#define OSPF_V2_OPTIONS_DN              0x80
#define OSPF_V3_OPTIONS_V6              0x000001
#define OSPF_V3_OPTIONS_E               0x000002
#define OSPF_V3_OPTIONS_MC              0x000004
#define OSPF_V3_OPTIONS_N               0x000008
#define OSPF_V3_OPTIONS_R               0x000010
#define OSPF_V3_OPTIONS_DC              0x000020
#define OSPF_V3_OPTIONS_AF              0x000100
#define OSPF_V3_OPTIONS_L               0x000200
#define OSPF_V3_OPTIONS_AT              0x000400

/* Bitmask definitions for the informational capabilities bits. */
#define OSPF_RI_OPTIONS_GRC             0x80
#define OSPF_RI_OPTIONS_GRH             0x40
#define OSPF_RI_OPTIONS_SRS             0x20
#define OSPF_RI_OPTIONS_TES             0x10
#define OSPF_RI_OPTIONS_P2PLAN          0x08
#define OSPF_RI_OPTIONS_ETE             0x04
#define OSPF_RI_OPTIONS_HOST            0x01

#define OSPF_LLS_EXT_OPTIONS_LR         0x00000001
#define OSPF_LLS_EXT_OPTIONS_RS         0x00000002

#define OSPF_V3_LLS_EXT_OPTIONS_LR      0x00000001
#define OSPF_V3_LLS_EXT_OPTIONS_RS      0x00000002

#define OSPF_V3_LLS_STATE_OPTIONS_R     0x80
#define OSPF_V3_LLS_STATE_OPTIONS_A     0x40
#define OSPF_V3_LLS_STATE_OPTIONS_N     0x20
#define OSPF_V3_LLS_RELAY_OPTIONS_A     0x80
#define OSPF_V3_LLS_RELAY_OPTIONS_N     0x40

#define OSPF_DBD_FLAG_MS        1
#define OSPF_DBD_FLAG_M         2
#define OSPF_DBD_FLAG_I         4
#define OSPF_DBD_FLAG_R         8

#define OSPF_LS_REQ_LENGTH      12

#define OSPF_LSTYPE_ROUTER      1
#define OSPF_LSTYPE_NETWORK     2
#define OSPF_LSTYPE_SUMMARY     3
#define OSPF_LSTYPE_ASBR        4
#define OSPF_LSTYPE_ASEXT       5
#define OSPF_LSTYPE_GRPMEMBER   6
#define OSPF_LSTYPE_ASEXT7      7
#define OSPF_LSTYPE_EXTATTR     8
#define OSPF_LSTYPE_BASE        OSPF_LSTYPE_ROUTER
#define OSPF_V3_LSTYPE_ROUTER                1
#define OSPF_V3_LSTYPE_NETWORK               2
#define OSPF_V3_LSTYPE_INTER_AREA_PREFIX     3
#define OSPF_V3_LSTYPE_INTER_AREA_ROUTER     4
#define OSPF_V3_LSTYPE_AS_EXTERNAL           5
#define OSPF_V3_LSTYPE_GROUP_MEMBERSHIP      6
#define OSPF_V3_LSTYPE_NSSA                  7
#define OSPF_V3_LSTYPE_LINK                  8
#define OSPF_V3_LSTYPE_INTRA_AREA_PREFIX     9
#define OSPF_V3_LSTYPE_INTRA_AREA_TE        10
#define OSPF_V3_LSTYPE_GRACE                11
#define OSPF_V3_LSTYPE_OPAQUE_RI            12
#define OSPF_V3_LSTYPE_INTER_AS_TE_V3       13
#define OSPF_V3_LSTYPE_OSPF_V3_L1VPN        14
#define OSPF_V3_LSTYPE_OSPF_V3_AC           15
#define OSPF_V3_LSTYPE_OSPF_V3_DF           16

/* OSPFv3 E-LSA*/
#define OSPF_V3_LSTYPE_E_ROUTER            33
#define OSPF_V3_LSTYPE_E_NETWORK           34
#define OSPF_V3_LSTYPE_E_INTER_AREA_PREFIX 35
#define OSPF_V3_LSTYPE_E_INTER_AREA_ROUTER 36
#define OSPF_V3_LSTYPE_E_AS_EXTERNAL       37
// Not to be used per RFC 8362             38
#define OSPF_V3_LSTYPE_E_TYPE_7            39
#define OSPF_V3_LSTYPE_E_LINK              40
#define OSPF_V3_LSTYPE_E_INTRA_AREA_PREFIX 41

#define OSPF_V3_LSTYPE_SRV6_LOCATOR        42

/* Opaque LSA types */
#define OSPF_LSTYPE_OP_BASE      8
#define OSPF_LSTYPE_OP_LINKLOCAL 9
#define OSPF_LSTYPE_OP_AREALOCAL 10
#define OSPF_LSTYPE_OP_ASWIDE    11

#define OSPF_V3_LSA_FUNCTION_CODE_ROUTER            1
#define OSPF_V3_LSA_FUNCTION_CODE_NETWORK           2
#define OSPF_V3_LSA_FUNCTION_CODE_INTER_AREA_PREFIX 3
#define OSPF_V3_LSA_FUNCTION_CODE_INTER_AREA_ROUTER 4
#define OSPF_V3_LSA_FUNCTION_CODE_AS_EXTERNAL       5
#define OSPF_V3_LSA_FUNCTION_CODE_GROUP_MEMBERSHIP  6
#define OSPF_V3_LSA_FUNCTION_CODE_NSSA              7
#define OSPF_V3_LSA_FUNCTION_CODE_LINK              8
#define OSPF_V3_LSA_FUNCTION_CODE_INTRA_AREA_PREFIX 9
#define OSPF_V3_LSA_FUNCTION_CODE_BASE              OSPF_V3_LSA_FUNCTION_CODE_ROUTER
#define OSPF_V3_LSA_FUNCTION_CODE_OPAQUE_RI         12
#define OSPF_V3_LSA_FUNCTION_CODE_OPAQUE_RI_BASE    9

#define OSPF_LINK_PTP           1
#define OSPF_LINK_TRANSIT       2
#define OSPF_LINK_STUB          3
#define OSPF_LINK_VIRTUAL       4

#define OSPF_V3_LINK_PTP        1
#define OSPF_V3_LINK_TRANSIT    2
#define OSPF_V3_LINK_RESERVED   3
#define OSPF_V3_LINK_VIRTUAL    4

#define OSPF_LSA_HEADER_LENGTH  20

#define OSPF_DNA_LSA            0x8000
/* Opaque Link-State Advertisements (LSA) Option Types
 * https://www.iana.org/assignments/ospf-opaque-types/ospf-opaque-types.xhtml */
#define OSPF_LSA_MPLS_TE        1
#define OSPF_LSA_SYCAMORE       2
#define OSPF_LSA_GRACE          3
#define OSPF_LSA_OPAQUE_RI      4
#define OSPF_LSA_L1VPN          5
#define OSPF_LSA_IAS_TE_V2      6
#define OSPF_LSA_EXT_PREFIX     7
#define OSPF_LSA_EXT_LINK       8
#define OSPF_LSA_TTZ            9
#define OSPF_LSA_DYN_FLOODING   10
#define OSPF_LSA_EXT_IA_ASBR    11
#define OSPF_RESTART_REASON_UNKNOWN   0
#define OSPF_RESTART_REASON_SWRESTART 1
#define OSPF_RESTART_REASON_SWRELOAD  2
#define OSPF_RESTART_REASON_SWITCH    3

static const value_string restart_reason_vals[] = {
    {OSPF_RESTART_REASON_UNKNOWN,     "Unknown"                  },
    {OSPF_RESTART_REASON_SWRESTART,   "Software Restart"         },
    {OSPF_RESTART_REASON_SWRELOAD,    "Software Reload/Upgrade"  },
    {OSPF_RESTART_REASON_SWITCH,      "Processor Switchover"     },
    {0, NULL}
};

/* grace-LSA TLV Types */
#define GRACE_TLV_PERIOD 1
#define GRACE_TLV_REASON 2
#define GRACE_TLV_IP 3

static const value_string grace_tlv_type_vals[] = {
    {GRACE_TLV_PERIOD,     "Grace-LSA Grace Period"   },
    {GRACE_TLV_REASON,     "Grace-LSA Restart Reason" },
    {GRACE_TLV_IP,         "Grace-LSA Restart IP"     },
    {0,                    NULL                       }
};

/* http://www.iana.org/assignments/ospf-parameters/ospf-parameters.xhtml#ri-tlv */

/* Opaque-LSA - Router Informational Capabilities: TLV Types*/
#define OPAQUE_TLV_RI               1
#define OPAQUE_TLV_RF               2
#define OPAQUE_TLV_TMG_IP4          3
#define OPAQUE_TLV_TMG_IP6          4
#define OPAQUE_TLV_TNCD             5
#define OPAQUE_TLV_PCED             6
#define OPAQUE_TLV_DH               7
#define OPAQUE_TLV_SA               8
#define OPAQUE_TLV_SLR              9
#define OPAQUE_TLV_NAT              10
#define OPAQUE_TLV_SBD              11
#define OPAQUE_TLV_NODE_MSD         12
#define OPAQUE_TLV_TUNN_ENCAPS      13
#define OPAQUE_TLV_SRLB             14
#define OPAQUE_TLV_SRMS_PREF        15
#define OPAQUE_TLV_FLEX_ALGO_DEF    16
#define OPAQUE_TLV_OSPF_AREA_LEADER 17
#define OPAQUE_TLV_OSPF_DYN_FLOOD   18
#define OPAQUE_TLV_SRV6_CAPS        20
#define OPAQUE_TLV_IP_ALGO          21

/* The Opaque RI LSA TLV types definitions. */
static const value_string ri_tlv_type_vals[] = {
    {OPAQUE_TLV_RI,                 "Router Informational Capabilities"  },
    {OPAQUE_TLV_RF,                 "Router Functional Capabilities"     },
    {OPAQUE_TLV_TMG_IP4,            "TE-MESH-GROUP TLV (IPv4)"           },
    {OPAQUE_TLV_TMG_IP6,            "TE-MESH-GROUP TLV (IPv6)"           },
    {OPAQUE_TLV_TNCD,               "TE Node Capability Descriptor"      },
    {OPAQUE_TLV_PCED,               "PCED"                               },
    {OPAQUE_TLV_DH,                 "OSPF Dynamic Hostname"              },
    {OPAQUE_TLV_SA,                 "SR-Algorithm "                      },
    {OPAQUE_TLV_SLR,                "SID/Label Range"                    },
    {OPAQUE_TLV_NAT,                "Node Admin Tag "                    },
    {OPAQUE_TLV_SBD,                "S-BFD Discriminator"                },
    {OPAQUE_TLV_NODE_MSD,           "Node MSD"                           },
    {OPAQUE_TLV_TUNN_ENCAPS,        "Tunnel Encapsulations"              },
    {OPAQUE_TLV_SRLB,               "SR Local Block"                     },
    {OPAQUE_TLV_SRMS_PREF,          "SRMS Preference"                    },
    {OPAQUE_TLV_FLEX_ALGO_DEF,      "Flexible Algorithm Definition"      },
    {OPAQUE_TLV_OSPF_AREA_LEADER,   "OSPF Area Leader"                   },
    {OPAQUE_TLV_OSPF_DYN_FLOOD,     "OSPF Dynamic Flooding"              },
    {OPAQUE_TLV_SRV6_CAPS,          "SRv6 Capabilities"                  },
    {OPAQUE_TLV_IP_ALGO,            "IP Algorithm"                       },
    {0, NULL}
};

static const value_string ri_lsa_sa_tlv_type_vals[] = {
    {0,                             "Shortest Path First"                },
    {1,                             "Strict Shortest Path First"         },
    {0, NULL}
};

/* https://www.iana.org/assignments/ospfv3-parameters/ospfv3-parameters.xhtml#extended-lsa-tlvs */

/* OSPFv3 Extended-LSA TLVS (RFC 8362)*/
#define OSPF6_TLV_RESERVED  0
#define OSPF6_TLV_ROUTER_LINK  1
#define OSPF6_TLV_ATTACHED_ROUTERS  2
#define OSPF6_TLV_INTER_AREA_PREFIX  3
#define OSPF6_TLV_INTER_AREA_ROUTER  4
#define OSPF6_TLV_EXTERNAL_PREFIX  5
#define OSPF6_TLV_INTRA_AREA_PREFIX  6
#define OSPF6_TLV_IPV6_LL_ADDR  7
#define OSPF6_TLV_IPV4_LL_ADDR  8

static const value_string ospf6_extended_lsa_tlv_type_vals[] = {
    {OSPF6_TLV_ROUTER_LINK, "Router-Link TLV"},
    {OSPF6_TLV_ATTACHED_ROUTERS, "Attached-Routers TLV"},
    {OSPF6_TLV_INTER_AREA_PREFIX, "Inter-Area-Prefix TLV"},
    {OSPF6_TLV_INTER_AREA_ROUTER, "Inter-Area-Router TLV"},
    {OSPF6_TLV_EXTERNAL_PREFIX, "External-Prefix TLV"},
    {OSPF6_TLV_INTRA_AREA_PREFIX, "Intra-Area-Prefix TLV"},
    {OSPF6_TLV_IPV6_LL_ADDR, "IPv6 Link-Local Address TLV"},
    {OSPF6_TLV_IPV4_LL_ADDR, "IPv4 Link-Local Address TLV"},
    { 0, NULL }

};

/* OSPFv3 Extended-LSA Sub-TLVs  */
#define OSPF6_STLV_RESERVED 0
#define OSPF6_STLV_IPV6_FWD_ADDR 1
#define OSPF6_STLV_IPV4_FWD_ADDR 2

/* IGP MSD Type (rfc8491) */
#define IGP_MSD_TYPE_RESERVED           0
#define IGP_MSD_TYPE_MPLS               1
#define IGP_MSD_TYPE_SEGMENT_LEFT       41
#define IGP_MSD_TYPE_END_POP            42
#define IGP_MSD_TYPE_T_INSERT           43
#define IGP_MSD_TYPE_T_ENCAP            44
#define IGP_MSD_TYPE_END_D              45

static const value_string ospf_igp_msd_types[] = {
    { IGP_MSD_TYPE_RESERVED,            "Reserved" },
    { IGP_MSD_TYPE_MPLS,                "Base MPLS Imposition" },
    { IGP_MSD_TYPE_SEGMENT_LEFT,        "Maximum Segments Left" },
    { IGP_MSD_TYPE_END_POP,             "Maximum End Pop" },
    { IGP_MSD_TYPE_T_INSERT,            "Maximum T.Insert" },
    { IGP_MSD_TYPE_T_ENCAP,             "Maximum T.Encaps" },
    { IGP_MSD_TYPE_END_D,               "Maximum End D" },
    { 0, NULL }
};

static const value_string ri_lsa_fad_metric_type_vals[] = {
    {0,                             "IGP Metric"                         },
    {1,                             "Min Unidirectional Link Delay"      },
    {2,                             "Traffic Engineering Metric"         },
    {0, NULL}
};

/* Flex Algo Definition Sub-TLV (rfc9350) */
#define FAD_EXCLUDE_AG              1
#define FAD_INCLUDE_ANY_AG          2
#define FAD_INCLUDE_ALL_AG          3
#define FAD_DEF_FLAGS               4
#define FAD_EXCLUDE_SRLG            5

static const value_string ri_lsa_fad_stlv_type_vals[] = {
    { FAD_EXCLUDE_AG,       "Flexible Algorithm Exclude Admin Group"},
    { FAD_INCLUDE_ANY_AG,   "Flexible Algorithm Include-Any Admin Group"},
    { FAD_INCLUDE_ALL_AG,   "Flexible Algorithm Include-All Admin Group"},
    { FAD_DEF_FLAGS,        "Flexible Algorithm Definition Flags"},
    { FAD_EXCLUDE_SRLG,     "Flexible Algorithm Exclude SRLG"},
    { 0, NULL }
};

/* Flex Algo Definition Flags (rfc9350) */
#define FAD_DEF_FLAGS_M             0x80000000

/* Flex Algo Prefix Metric Flags (rfc9350) */
#define FAPM_FLAGS_E                0x80

static const value_string ls_type_vals[] = {
    {OSPF_LSTYPE_ROUTER,                  "Router-LSA"                   },
    {OSPF_LSTYPE_NETWORK,                 "Network-LSA"                  },
    {OSPF_LSTYPE_SUMMARY,                 "Summary-LSA (IP network)"     },
    {OSPF_LSTYPE_ASBR,                    "Summary-LSA (ASBR)"           },
    {OSPF_LSTYPE_ASEXT,                   "AS-External-LSA (ASBR)"       },
    {OSPF_LSTYPE_GRPMEMBER,               "Group Membership LSA"         },
    {OSPF_LSTYPE_ASEXT7,                  "NSSA AS-External-LSA"         },
    {OSPF_LSTYPE_EXTATTR,                 "External Attributes LSA"      },
    {OSPF_LSTYPE_OP_LINKLOCAL,            "Opaque LSA, Link-local scope" },
    {OSPF_LSTYPE_OP_AREALOCAL,            "Opaque LSA, Area-local scope" },
    {OSPF_LSTYPE_OP_ASWIDE,               "Opaque LSA, AS-local scope" },
    {0,                                   NULL                           }

};

static const value_string ls_opaque_type_vals[] = {
    {OSPF_LSA_MPLS_TE,      "Traffic Engineering LSA"                   },
    {OSPF_LSA_SYCAMORE,     "Sycamore Optical Topology Descriptions"    },
    {OSPF_LSA_GRACE,        "Grace-LSA"                                 },
    {OSPF_LSA_OPAQUE_RI,    "Router Information (RI)"                   },
    {OSPF_LSA_L1VPN,        "L1VPN LSA"                                 },
    {OSPF_LSA_IAS_TE_V2,    "Inter-AS-TE-v2 LSA"                        },
    {OSPF_LSA_EXT_PREFIX,   "OSPFv2 Extended Prefix Opaque LSA"         },
    {OSPF_LSA_EXT_LINK,     "OSPFv2 Extended Link Opaque LSA"           },
    {OSPF_LSA_TTZ,          "TTZ LSA"                                   },
    {OSPF_LSA_DYN_FLOODING, "OSPFv2 Dynamic Flooding Opaque LSA"        },
    {OSPF_LSA_EXT_IA_ASBR,  "OSPFv2 Extended Inter-Area ASBR LSA"       },
    {0,                     NULL                                        }
};

static const value_string v3_ls_type_vals[] = {
    {OSPF_V3_LSTYPE_ROUTER,               "Router-LSA"                   },
    {OSPF_V3_LSTYPE_NETWORK,              "Network-LSA"                  },
    {OSPF_V3_LSTYPE_INTER_AREA_PREFIX,    "Inter-Area-Prefix-LSA"        },
    {OSPF_V3_LSTYPE_INTER_AREA_ROUTER,    "Inter-Area-Router-LSA"        },
    {OSPF_V3_LSTYPE_AS_EXTERNAL,          "AS-External-LSA"              },
    {OSPF_V3_LSTYPE_GROUP_MEMBERSHIP,     "Group-Membership-LSA"         },
    {OSPF_V3_LSTYPE_NSSA,                 "NSSA-LSA"                     },
    {OSPF_V3_LSTYPE_LINK,                 "Link-LSA"                     },
    {OSPF_V3_LSTYPE_INTRA_AREA_PREFIX,    "Intra-Area-Prefix-LSA"        },
    {OSPF_V3_LSTYPE_INTRA_AREA_TE,        "Intra-Area-TE-LSA"            },
    {OSPF_V3_LSTYPE_GRACE,                "GRACE-LSA"                    },
    {OSPF_V3_LSTYPE_OPAQUE_RI,            "Router Information Opaque-LSA"},
    {OSPF_V3_LSTYPE_INTER_AS_TE_V3,       "Inter-AS-TE-V3 LSA"           },
    {OSPF_V3_LSTYPE_OSPF_V3_L1VPN,        "OSPFv3 L1VPN LSA"             },
    {OSPF_V3_LSTYPE_OSPF_V3_AC,           "OSPFv3 Autoconfiguration LSA" },
    {OSPF_V3_LSTYPE_OSPF_V3_DF,           "OSPFv3 Dynamic Flooding LSA"  },
    {OSPF_V3_LSTYPE_E_ROUTER,             "E-Router-LSA"                 },
    {OSPF_V3_LSTYPE_E_NETWORK,            "E-Network-LSA"                },
    {OSPF_V3_LSTYPE_E_INTER_AREA_PREFIX,  "E-Inter-Area-Prefix-LSA"      },
    {OSPF_V3_LSTYPE_E_INTER_AREA_ROUTER,  "E-Inter-Area-Router-LSA"      },
    {OSPF_V3_LSTYPE_E_AS_EXTERNAL,        "E-AS-External-LSA"            },
    {OSPF_V3_LSTYPE_E_TYPE_7,             "E-Type-7-LSA"                 },
    {OSPF_V3_LSTYPE_E_LINK,               "E-Link-LSA"                   },
    {OSPF_V3_LSTYPE_E_INTRA_AREA_PREFIX,  "E-Intra-Area-Prefix-LSA"      },
    {OSPF_V3_LSTYPE_SRV6_LOCATOR,         "SRv6 Locator LSA"             },
    {0,                                   NULL                           }
};

static const value_string v3_ls_type_s12_vals[] = {
    {0, "Link-Local Scoping - Flooded only on originating link"          },
    {1, "Area Scoping - Flooded only in originating area"                },
    {2, "AS Scoping - Flooded throughout AS"                             },
    {3, "Reserved"                                                       },
    {0, NULL                                                             }
};

static const true_false_string tfs_v3_ls_type_u = {
    "Treat the LSA as if it had link-local flooding scope",
    "Store and flood the LSA as if the type is understood"
};

static const true_false_string tfs_lsa_external_type = { "Type 2 (metric is larger than any other link state path)",
                                                         "Type 1 (metric is specified in the same units as interface cost)" };

static const value_string ospf_v3_lsa_type_vals[] = {
    {OSPF_V3_LINK_PTP, "Point-to-point connection to another router"},
    {OSPF_V3_LINK_TRANSIT, "Connection to a transit network"},
    {OSPF_LINK_STUB, "Connection to a stub network"},
    {OSPF_V3_LINK_VIRTUAL, "Virtual link"},
    {0, NULL},
};

static const value_string ospf_v3_lsa_type_short_vals[] = {
    {OSPF_V3_LINK_PTP, "PTP"},
    {OSPF_V3_LINK_TRANSIT, "Transit"},
    {OSPF_LINK_STUB, "Stub"},
    {OSPF_V3_LINK_VIRTUAL, "Virtual"},
    {0, NULL},
};

static const value_string ospf_v3_lsa_link_id_vals[] = {
    {OSPF_V3_LINK_PTP, "Neighboring router's Router ID"},
    {OSPF_V3_LINK_TRANSIT, "IP address of Designated Router"},
    {OSPF_LINK_STUB, "IP network/subnet number"},
    {OSPF_V3_LINK_VIRTUAL, "Neighboring router's Router ID"},
    {0, NULL},
};

/* OSPFv3 LLS TLV Types */
#define LLS_V2_EXT_OPT         1
#define LLS_V2_CRYPTO_OPT      2
#define LLS_V2_LI_ID_OPT       18

static const value_string lls_tlv_type_vals[] = {
    {LLS_V2_EXT_OPT,                      "Extended options TLV"         },
    {LLS_V2_CRYPTO_OPT,                   "Crypto Authentication TLV"    },
    {LLS_V2_LI_ID_OPT,                    "Local Interface ID"           },
    {0,                                   NULL                           }
};

/* OSPFv3 LLS TLV Types */
#define LLS_V3_EXT_OPT       1
#define LLS_V3_STATE_CHECK   3
#define LLS_V3_NBR_DROP      4
#define LLS_V3_RELAYS        7
#define LLS_V3_WILLING       8
#define LLS_V3_RQST_FROM     5
#define LLS_V3_FULL_STATE    6

static const value_string lls_v3_tlv_type_vals[] = {
    {LLS_V3_EXT_OPT,                      "Extended Options TLV"          },
    {LLS_V3_STATE_CHECK,                  "State Check Sequence TLV"      },
    {LLS_V3_NBR_DROP,                     "Neighbor Drop TLV"             },
    {LLS_V3_RELAYS,                       "Active Overlapping Relays TLV" },
    {LLS_V3_WILLING,                      "Willingness TLV"               },
    {LLS_V3_RQST_FROM,                    "Request From LTV"              },
    {LLS_V3_FULL_STATE,                   "Full State For TLV"            },
    {0,                                   NULL                            }
};

static const value_string mpls_link_stlv_ltype_str[] = {
    {1, "Point-to-point"},
    {2, "Multi-access"},
    {0, NULL}
};

/* FF: from www.iana.org/assignments/bandwidth-constraints-model-ids */
static const range_string mpls_link_stlv_bcmodel_rvals[] = {
    { 0,     0, "(Russian Dolls Model - RDM)"                       },
    { 1,     1, "(Maximum Allocation Model - MAM)"                  },
    { 2,     2, "(Maximum Allocation with Reservation Model - MAR)" },
    { 3,   239, "(Unassigned, Specification Required)"              },
    { 240, 255, "(Reserved, Private Use)"                           },
    { 0,     0, NULL                                                }
};

static const true_false_string tfs_arbitrary_standard = { "Arbitrary", "Standard" };

#define OSPF_V2_ROUTER_LSA_FLAG_B 0x01
#define OSPF_V2_ROUTER_LSA_FLAG_E 0x02
#define OSPF_V2_ROUTER_LSA_FLAG_V 0x04
#define OSPF_V2_ROUTER_LSA_FLAG_W 0x08
#define OSPF_V2_ROUTER_LSA_FLAG_N 0x10
#define OSPF_V2_ROUTER_LSA_FLAG_S 0x20
#define OSPF_V2_ROUTER_LSA_FLAG_H 0x80
#define OSPF_V3_ROUTER_LSA_FLAG_B 0x01
#define OSPF_V3_ROUTER_LSA_FLAG_E 0x02
#define OSPF_V3_ROUTER_LSA_FLAG_V 0x04
#define OSPF_V3_ROUTER_LSA_FLAG_W 0x08

#define OSPF_V3_PREFIX_OPTION_NU 0x01
#define OSPF_V3_PREFIX_OPTION_LA 0x02
#define OSPF_V3_PREFIX_OPTION_MC 0x04
#define OSPF_V3_PREFIX_OPTION_P  0x08

#define OSPF_V3_AS_EXTERNAL_FLAG_T 0x01
#define OSPF_V3_AS_EXTERNAL_FLAG_F 0x02
#define OSPF_V3_AS_EXTERNAL_FLAG_E 0x04

/* OSPFv2 Extended Prefix LSA TLV types definitions. (RFC7684) */
/* OSPF Extended Prefix TLV Registry */
#define EXT_PREFIX_TLV_PREFIX             1
#define EXT_PREFIX_TLV_PREFIX_RANGE       2

#define EXT_PREFIX_TLV_ROUTE_UNSPEC       0
#define EXT_PREFIX_TLV_ROUTE_INTRA        1
#define EXT_PREFIX_TLV_ROUTE_INTER        3
#define EXT_PREFIX_TLV_ROUTE_ASEXT        5
#define EXT_PREFIX_TLV_ROUTE_NSSAEXT      7

#define EXT_PREFIX_TLV_AF_IPV4_UNI        0

#define EXT_PREFIX_TLV_FLAG_A             0x80
#define EXT_PREFIX_TLV_FLAG_N             0x40
#define EXT_PREFIX_TLV_FLAG_UNKNOWN       ~(EXT_PREFIX_TLV_FLAG_A | EXT_PREFIX_TLV_FLAG_N)

#define EXT_PREFIX_RANGE_TLV_FLAG_IA      0x80
#define EXT_PREFIX_RANGE_TLV_FLAG_UNKNOWN ~(EXT_PREFIX_RANGE_TLV_FLAG_IA)

static const value_string ext_pfx_tlv_type_vals[] = {
    {EXT_PREFIX_TLV_PREFIX,               "OSPFv2 Extended Prefix"       },
    {EXT_PREFIX_TLV_PREFIX_RANGE,         "OSPFv2 Extended Prefix Range" },
    {0, NULL}
};
static const value_string ext_pfx_tlv_route_vals[] = {
    {EXT_PREFIX_TLV_ROUTE_UNSPEC,         "Unspecified"                  },
    {EXT_PREFIX_TLV_ROUTE_INTRA,          "Intra-Area"                   },
    {EXT_PREFIX_TLV_ROUTE_INTER,          "Inter-Area"                   },
    {EXT_PREFIX_TLV_ROUTE_ASEXT,          "AS-External"                  },
    {EXT_PREFIX_TLV_ROUTE_NSSAEXT,        "NSSA-External"                },
    {0, NULL}
};
static const value_string ext_pfx_tlv_af_vals[] = {
    {EXT_PREFIX_TLV_AF_IPV4_UNI,          "IPv4 Unicast"                 },
    {0, NULL}
};

/* OSPF Extended Prefix Sub-TLV Registry */
#define SR_STLV_SID_LABEL                 1
#define SR_STLV_PREFIX_SID                2
#define SR_STLV_FLEX_ALGO_PREFIX_METRIC   3

#define SR_STLV_PFXSID_FLAG_NP            0x40
#define SR_STLV_PFXSID_FLAG_M             0x20
#define SR_STLV_PFXSID_FLAG_E             0x10
#define SR_STLV_PFXSID_FLAG_V             0x08
#define SR_STLV_PFXSID_FLAG_L             0x04
#define SR_STLV_PFXSID_FLAG_UNKNOWN       ~(SR_STLV_PFXSID_FLAG_NP | SR_STLV_PFXSID_FLAG_M | SR_STLV_PFXSID_FLAG_E | SR_STLV_PFXSID_FLAG_V | SR_STLV_PFXSID_FLAG_L)

static const value_string ext_pfx_stlv_type_vals[] = {
    {SR_STLV_SID_LABEL,                   "SID/Label"                    },
    {SR_STLV_PREFIX_SID,                  "Prefix SID"                   },
    {SR_STLV_FLEX_ALGO_PREFIX_METRIC,     "Flexible Algorithm Prefix Metric" },
    {0, NULL}
};

/* OSPFv2 Extended Link LSA TLV types definitions. (RFC7684) */
/* OSPF Extended Link TLV Registry */
#define EXT_LINK_TLV_LINK                 1

static const value_string ext_link_tlv_type_vals[] = {
    {EXT_LINK_TLV_LINK,                   "OSPFv2 Extended Link"         },
    {0, NULL}
};

/* OSPF Extended Link Sub-TLV Registry */
#define SR_STLV_ADJSID                    2
#define SR_STLV_LAN_ADJSID                3
#define SR_STLV_LINK_MSD                  6
#define SR_STLV_GRACEFUL_LINK_SHUTDOWN    7
#define SR_STLV_REMOTE_IPV4_ADDRESS       8
#define SR_STLV_LOCAL_REMOTE_INTERFACE_ID 9
#define SR_STLV_APP_SPEC_LINK_ATTR        10
#define SR_STLV_SRLG                      11
#define SR_STLV_UNIDIR_LINK_DELAY         12
#define SR_STLV_UNIDIR_LINK_DELAY_MIN_MAX 13
#define SR_STLV_UNIDIR_DELAY_VARIATION    14
#define SR_STLV_ADMIN_GROUP               19
#define SR_STLV_EXT_ADMIN_GROUP           20
#define SR_STLV_TE_METRIC                 22

#define SR_STLV_ADJSID_FLAG_B             0x80
#define SR_STLV_ADJSID_FLAG_V             0x40
#define SR_STLV_ADJSID_FLAG_L             0x20
#define SR_STLV_ADJSID_FLAG_G             0x10
#define SR_STLV_ADJSID_FLAG_P             0x08
#define SR_STLV_ADJSID_FLAG_UNKNOWN       ~(SR_STLV_ADJSID_FLAG_B | SR_STLV_ADJSID_FLAG_V | SR_STLV_ADJSID_FLAG_L | SR_STLV_ADJSID_FLAG_G | SR_STLV_ADJSID_FLAG_P)

static const value_string ext_link_stlv_type_vals[] = {
    {SR_STLV_SID_LABEL,                   "SID/Label"                    },
    {SR_STLV_ADJSID,                      "Adj-SID"                      },
    {SR_STLV_LAN_ADJSID,                  "LAN Adj-SID"                  },
    {SR_STLV_LINK_MSD,                    "Link MSD"                     },
    {SR_STLV_GRACEFUL_LINK_SHUTDOWN,      "Graceful Link Shutdown"       },
    {SR_STLV_REMOTE_IPV4_ADDRESS,         "Remote IPv4 Address"          },
    {SR_STLV_LOCAL_REMOTE_INTERFACE_ID,   "Local/Remote Interface ID"    },
    {SR_STLV_APP_SPEC_LINK_ATTR,          "Application-Specific Link Attributes"},
    {SR_STLV_SRLG,                        "Shared Risk Link Group"       },
    {SR_STLV_UNIDIR_LINK_DELAY,           "Unidirectional Link Delay"    },
    {SR_STLV_UNIDIR_LINK_DELAY_MIN_MAX,   "Min/Max Unidirectional Link Delay"},
    {SR_STLV_UNIDIR_DELAY_VARIATION,      "Unidirectional Delay Variation"},
    {SR_STLV_ADMIN_GROUP,                 "Administrative Group"         },
    {SR_STLV_EXT_ADMIN_GROUP,             "Extended Administrative Group"},
    {SR_STLV_TE_METRIC,                   "TE Metric"                    },
    {0, NULL}
};

/* OSPFv2 Extended Inter-Area ASBR LSA TLV types definitions. (RFC9350) */
/* OSPFv2 Extended Inter-Area ASBR TLV Registry */
#define EXT_IA_ASBR_TLV_EIA_ASBR          1

static const value_string ext_ia_asbr_tlv_type_vals[] = {
    {EXT_IA_ASBR_TLV_EIA_ASBR,            "OSPFv2 Extended Inter-Area ASBR"       },
    {0, NULL}
};

/* OSPFv2 Extended Inter-Area ASBR Sub-TLVs Registry */
#define SR_STLV_FLEX_ALGO_ASBR_METRIC     1

static const value_string ext_ia_asbr_stlv_type_vals[] = {
    {SR_STLV_FLEX_ALGO_ASBR_METRIC,       "Flexible Algorithm ASBR Metric"        },
    {0, NULL}
};

static int proto_ospf;

static int ett_ospf;
static int ett_ospf_at;
static int ett_ospf_hdr;
static int ett_ospf_hello;
static int ett_ospf_desc;
static int ett_ospf_lsr;
static int ett_ospf_lsa;
static int ett_ospf_elsa;
static int ett_ospf_elsa_pfx_tlv;
static int ett_ospf_lsa_router_link;
static int ett_ospf_lsa_upd;
static int ett_ospf_v2_options;
static int ett_ospf_ri_options;
static int ett_ospf_v3_options;
static int ett_ospf_dbd;
static int ett_ospf_lls_data_block;
static int ett_ospf_lls_tlv;
static int ett_ospf_lls_ext_options;
static int ett_ospf_v3_lls_ext_options_tlv;
static int ett_ospf_v3_lls_ext_options;
static int ett_ospf_v3_lls_state_tlv;
static int ett_ospf_v3_lls_state_scs;
static int ett_ospf_v3_lls_state_options;
static int ett_ospf_v3_lls_drop_tlv;
static int ett_ospf_v3_lls_relay_tlv;
static int ett_ospf_v3_lls_relay_added;
static int ett_ospf_v3_lls_relay_options;
static int ett_ospf_v3_lls_willingness_tlv;
static int ett_ospf_v3_lls_willingness;
static int ett_ospf_v3_lls_rf_tlv;
static int ett_ospf_v3_lls_fsf_tlv;
static int ett_ospf_v2_router_lsa_flags;
static int ett_ospf_v3_router_lsa_flags;
static int ett_ospf_v3_as_external_flags;
static int ett_ospf_v3_prefix_options;
static int ett_ospf_v3_router_interface;
static int ett_ospf_v3_router_interface_entry;
static int ett_ospf_mpls_pri;
static int ett_ospf_mpls_bitmap;

/* Trees for opaque LSAs */
static int ett_ospf_lsa_mpls;
static int ett_ospf_lsa_mpls_bandwidth_sstlv;
static int ett_ospf_lsa_mpls_base_label;
static int ett_ospf_lsa_mpls_router;
static int ett_ospf_lsa_mpls_link;
static int ett_ospf_lsa_mpls_link_stlv;
static int ett_ospf_lsa_mpls_link_stlv_admingrp;
static int ett_ospf_lsa_oif_tna;
static int ett_ospf_lsa_oif_tna_stlv;
static int ett_ospf_lsa_grace_tlv;
static int ett_ospf_lsa_opaque_ri;
static int ett_ospf_lsa_ri_tlv;
static int ett_ospf_lsa_dh_tlv;
static int ett_ospf_lsa_sa_tlv;
static int ett_ospf_lsa_slr_tlv;
static int ett_ospf_lsa_slr_stlv;
static int ett_ospf_lsa_srms_tlv;
static int ett_ospf_lsa_node_msd_tlv;
static int ett_ospf_lsa_fad_tlv;
static int ett_ospf_lsa_fad_stlv;
static int ett_ospf_lsa_fad_def_flags;
static int ett_ospf_lsa_fapm_flags;
static int ett_ospf_lsa_elink;
static int ett_ospf_lsa_epfx;
static int ett_ospf_lsa_elink_tlv;
static int ett_ospf_lsa_elink_stlv;
static int ett_ospf_lsa_epfx_tlv;
static int ett_ospf_lsa_epfx_flags;
static int ett_ospf_lsa_epfx_stlv;
static int ett_ospf_lsa_epfx_range_flags;
static int ett_ospf_lsa_pfxsid_flags;
static int ett_ospf_lsa_adjsid_flags;
static int ett_ospf_lsa_app_sabm_bits;
static int ett_ospf_lsa_app_link_attrs_stlv;
static int ett_ospf_lsa_unidir_link_flags;
static int ett_ospf_lsa_eia_asbr;
static int ett_ospf_lsa_eia_asbr_tlv;
static int ett_ospf_lsa_eia_asbr_stlv;
static int ett_ospf_lsa_unknown_tlv;

static int ett_ospf_lsa_type;


/* The Options field in the first TLV of the Opaque RI LSA with type field set to "4" for OSPFv2
   and type field set to "12" in OSPFv3, is interpreted as advertizing optional router capabilties.
   (RFC4970) */
static const true_false_string tfs_v3_as_external_flags_e = {
    "Type 2",
    "Type 1"
};

/*-----------------------------------------------------------------------
 * OSPF Filtering
 *-----------------------------------------------------------------------*/

/* OSPF MSG Type */
static int hf_ospf_msg_hello;
static int hf_ospf_msg_db_desc;
static int hf_ospf_msg_ls_req;
static int hf_ospf_msg_ls_upd;
static int hf_ospf_msg_ls_ack;

static int *hf_ospf_msg_type_array[] = {
        &hf_ospf_msg_hello,
        &hf_ospf_msg_db_desc,
        &hf_ospf_msg_ls_req,
        &hf_ospf_msg_ls_upd,
        &hf_ospf_msg_ls_ack,
};

static int hf_ospf_ls_type;
static int hf_ospf_ls_age;
static int hf_ospf_ls_donotage;
static int hf_ospf_ls_id;
static int hf_ospf_ls_seqnum;
static int hf_ospf_ls_chksum;
static int hf_ospf_ls_length;
static int hf_ospf_ls_opaque_type;
static int hf_ospf_ls_mpls_te_instance;

/* OSPF V2 LSA Type  */
static int hf_ospf_ls_router;
static int hf_ospf_ls_router_linktype;
static int hf_ospf_ls_router_linkid;
static int hf_ospf_ls_router_linkdata;
static int hf_ospf_ls_router_nummetrics;
static int hf_ospf_ls_router_metric0;
static int hf_ospf_ls_network;
static int hf_ospf_ls_network_netmask;
static int hf_ospf_ls_network_attachrtr;
static int hf_ospf_ls_summary;
static int hf_ospf_ls_asbr;
static int hf_ospf_ls_asbr_netmask;
static int hf_ospf_ls_asext;
static int hf_ospf_ls_asext_netmask;
static int hf_ospf_ls_asext_fwdaddr;
static int hf_ospf_ls_asext_extrtrtag;
static int hf_ospf_ls_grpmember;
static int hf_ospf_ls_asext7;
static int hf_ospf_ls_extattr;
static int hf_ospf_ls_opaque;

static int *hf_ospf_ls_type_array[] = {
        &hf_ospf_ls_router,
        &hf_ospf_ls_network,
        &hf_ospf_ls_summary,
        &hf_ospf_ls_asbr,
        &hf_ospf_ls_asext,
        &hf_ospf_ls_grpmember,
        &hf_ospf_ls_asext7,
        &hf_ospf_ls_extattr,
        &hf_ospf_ls_opaque
};

static int hf_ospf_v3_ls_type;
static int hf_ospf_v3_ls_type_u;
static int hf_ospf_v3_ls_type_s12;
static int hf_ospf_v3_ls_type_fc;

/* OSPF V3 LSA Type */
static int hf_ospf_v3_ls_router;
static int hf_ospf_v3_ls_network;
static int hf_ospf_v3_ls_inter_area_prefix;
static int hf_ospf_v3_ls_inter_area_router;
static int hf_ospf_v3_ls_as_external;
static int hf_ospf_v3_ls_group_membership;
static int hf_ospf_v3_ls_nssa;
static int hf_ospf_v3_ls_link;
static int hf_ospf_v3_ls_intra_area_prefix;
static int hf_ospf_v3_ls_opaque_ri;

static int hf_ospf_v3_elsa_intra_area_prefix;

static int *hf_ospf_v3_ls_type_array[] = {
        &hf_ospf_v3_ls_router,
        &hf_ospf_v3_ls_network,
        &hf_ospf_v3_ls_inter_area_prefix,
        &hf_ospf_v3_ls_inter_area_router,
        &hf_ospf_v3_ls_as_external,
        &hf_ospf_v3_ls_group_membership,
        &hf_ospf_v3_ls_nssa,
        &hf_ospf_v3_ls_link,
        &hf_ospf_v3_ls_intra_area_prefix,
        &hf_ospf_v3_ls_opaque_ri,
        &hf_ospf_v3_elsa_intra_area_prefix
};

static int hf_ospf_adv_router;
static int hf_ospf_ls_mpls;
static int hf_ospf_ls_mpls_routerid;
static int hf_ospf_ls_mpls_linktype;
static int hf_ospf_ls_mpls_linkid;
static int hf_ospf_ls_mpls_local_addr;
static int hf_ospf_ls_mpls_remote_addr;
static int hf_ospf_ls_mpls_local_ifid;
static int hf_ospf_ls_mpls_remote_ifid;
static int hf_ospf_ls_mpls_te_metric;
static int hf_ospf_ls_mpls_linkcolor;
static int hf_ospf_ls_mpls_group;
static int hf_ospf_ls_mpls_link_max_bw;
static int hf_ospf_ls_mpls_bc_model_id;
static int hf_ospf_ls_oif_local_node_id;
static int hf_ospf_ls_oif_remote_node_id;
static int hf_ospf_v2_options;
static int hf_ospf_v2_options_mt;
static int hf_ospf_v2_options_e;
static int hf_ospf_v2_options_mc;
static int hf_ospf_v2_options_n;
static int hf_ospf_v2_options_p;
static int hf_ospf_v2_options_l;
static int hf_ospf_v2_options_dc;
static int hf_ospf_v2_options_o;
static int hf_ospf_v2_options_dn;

static int hf_ospf_tlv_type_opaque;

static int hf_ospf_ri_options;
/* OSPF Router Informational Capabilities Options */
static int hf_ospf_ri_options_grc;
static int hf_ospf_ri_options_grh;
static int hf_ospf_ri_options_srs;
static int hf_ospf_ri_options_tes;
static int hf_ospf_ri_options_p2plan;
static int hf_ospf_ri_options_ete;
static int hf_ospf_ri_options_host;

/* OSPF Extended Link Opaque LSA */
static int hf_ospf_ls_elink_tlv;
static int hf_ospf_ls_elink_stlv;
static int hf_ospf_ls_elink_mt_id;
static int hf_ospf_ls_elink_weight;
static int hf_ospf_ls_elink_nbr;
static int hf_ospf_ls_pfxsid_flags;
static int hf_ospf_ls_pfxsid_flag_np;
static int hf_ospf_ls_pfxsid_flag_m;
static int hf_ospf_ls_pfxsid_flag_e;
static int hf_ospf_ls_pfxsid_flag_v;
static int hf_ospf_ls_pfxsid_flag_l;
static int hf_ospf_ls_pfxsid_flag_unknown;
static int hf_ospf_ls_adjsid_flags;
static int hf_ospf_ls_adjsid_flag_b;
static int hf_ospf_ls_adjsid_flag_v;
static int hf_ospf_ls_adjsid_flag_l;
static int hf_ospf_ls_adjsid_flag_g;
static int hf_ospf_ls_adjsid_flag_p;
static int hf_ospf_ls_adjsid_flag_unknown;
static int hf_ospf_ls_app_sabm_length;
static int hf_ospf_ls_app_udabm_length;
static int hf_ospf_ls_app_sabm_bits;
static int hf_ospf_ls_app_sabm_bits_r;
static int hf_ospf_ls_app_sabm_bits_s;
static int hf_ospf_ls_app_sabm_bits_f;
static int hf_ospf_ls_app_sabm_bits_x;
static int hf_ospf_ls_app_udabm_bits;
static int hf_ospf_ls_app_link_attrs_stlv;
static int hf_ospf_ls_srlg;
static int hf_ospf_ls_admin_group;
static int hf_ospf_ls_ext_admin_group;
static int hf_ospf_ls_unidir_link_flags;
static int hf_ospf_ls_unidir_link_flags_a;
static int hf_ospf_ls_unidir_link_flags_reserved;
static int hf_ospf_ls_unidir_link_delay;
static int hf_ospf_ls_unidir_link_reserved;
static int hf_ospf_ls_unidir_link_delay_min;
static int hf_ospf_ls_unidir_link_delay_max;
static int hf_ospf_ls_unidir_delay_variation;

/* OSPF Extended Prefix Opaque LSA */
static int hf_ospf_ls_epfx_tlv;
static int hf_ospf_ls_epfx_stlv;
static int hf_ospf_ls_epfx_route_type;
static int hf_ospf_ls_epfx_af;
static int hf_ospf_ls_epfx_flags;
static int hf_ospf_ls_epfx_flag_a;
static int hf_ospf_ls_epfx_flag_n;
static int hf_ospf_ls_epfx_flag_unknown;
static int hf_ospf_ls_epfx_range_flags;
static int hf_ospf_ls_epfx_range_flag_ia;
static int hf_ospf_ls_epfx_range_flag_unknown;

/* OSPF Extended Inter-Area ASBR LSA */
static int hf_ospf_ls_eia_asbr_tlv;
static int hf_ospf_ls_eia_asbr_stlv;
static int hf_ospf_ls_eia_asbr_asbr_routerid;
static int hf_ospf_ls_faam_reserved;
static int hf_ospf_ls_faam_metric;

/* OSPF Dynamic Hostname support (RFC5642) */
static int hf_ospf_v3_options;
static int hf_ospf_v3_options_v6;
static int hf_ospf_v3_options_e;
static int hf_ospf_v3_options_mc;
static int hf_ospf_v3_options_n;
static int hf_ospf_v3_options_r;
static int hf_ospf_v3_options_dc;
static int hf_ospf_v3_options_af;
static int hf_ospf_v3_options_l;
static int hf_ospf_v3_options_at;
static int hf_ospf_dbd;
static int hf_ospf_dbd_r;
static int hf_ospf_dbd_i;
static int hf_ospf_dbd_m;
static int hf_ospf_dbd_ms;
static int hf_ospf_lls_ext_options;
static int hf_ospf_lls_ext_options_lr;
static int hf_ospf_lls_ext_options_rs;
static int hf_ospf_v2_router_lsa_flag;
static int hf_ospf_v2_router_lsa_flag_b;
static int hf_ospf_v2_router_lsa_flag_e;
static int hf_ospf_v2_router_lsa_flag_v;
static int hf_ospf_v2_router_lsa_flag_w;
static int hf_ospf_v2_router_lsa_flag_n;
static int hf_ospf_v2_router_lsa_flag_s;
static int hf_ospf_v2_router_lsa_flag_h;
static int hf_ospf_v3_router_lsa_flag;
static int hf_ospf_v3_router_lsa_flag_b;
static int hf_ospf_v3_router_lsa_flag_e;
static int hf_ospf_v3_router_lsa_flag_v;
static int hf_ospf_v3_router_lsa_flag_w;
static int hf_ospf_v3_as_external_flag;
static int hf_ospf_v3_as_external_flag_t;
static int hf_ospf_v3_as_external_flag_f;
static int hf_ospf_v3_as_external_flag_e;
static int hf_ospf_v3_prefix_option;
static int hf_ospf_v3_prefix_option_nu;
static int hf_ospf_v3_prefix_option_la;
static int hf_ospf_v3_prefix_option_mc;
static int hf_ospf_v3_prefix_option_p;
static int hf_ospf_dyn_hostname;
static int hf_ospf_lsa_sa;
static int hf_ospf_ls_slr_stlv;
static int hf_ospf_ls_range_size;
static int hf_ospf_ls_sid_label;
static int hf_ospf_ls_preference;
static int hf_ospf_ls_igp_msd_type;
static int hf_ospf_ls_igp_msd_value;
static int hf_ospf_ls_remote_ipv4_addr;
static int hf_ospf_ls_local_interface_id;
static int hf_ospf_ls_remote_interface_id;
static int hf_ospf_ls_flex_algorithm;
static int hf_ospf_ls_fad_metric_type;
static int hf_ospf_ls_fad_calc_type;
static int hf_ospf_ls_fad_priority;
static int hf_ospf_ls_fad_stlv;
static int hf_ospf_ls_fad_def_flags;
static int hf_ospf_ls_fad_def_flags_m;
static int hf_ospf_ls_fapm_flags;
static int hf_ospf_ls_fapm_flags_e;
static int hf_ospf_ls_fapm_metric;
static int hf_ospf_unknown_tlv;
static int hf_ospf_grace_tlv;
static int hf_ospf_grace_period;
static int hf_ospf_grace_reason;
static int hf_ospf_grace_ip;
static int hf_ospf_v3_lls_ext_options_tlv;
static int hf_ospf_v3_lls_ext_options;
static int hf_ospf_v3_lls_ext_options_lr;
static int hf_ospf_v3_lls_ext_options_rs;
static int hf_ospf_v3_lls_state_tlv;
static int hf_ospf_v3_lls_state_scs;
static int hf_ospf_v3_lls_state_options;
static int hf_ospf_v3_lls_state_options_r;
static int hf_ospf_v3_lls_state_options_a;
static int hf_ospf_v3_lls_state_options_n;
static int hf_ospf_v3_lls_drop_tlv;
static int hf_ospf_v3_lls_relay_tlv;
static int hf_ospf_v3_lls_relay_added;
static int hf_ospf_v3_lls_relay_options;
static int hf_ospf_v3_lls_relay_options_a;
static int hf_ospf_v3_lls_relay_options_n;
static int hf_ospf_v3_lls_willingness_tlv;
static int hf_ospf_v3_lls_willingness;
static int hf_ospf_v3_lls_rf_tlv;
static int hf_ospf_v3_lls_fsf_tlv;

static int hf_ospf_header;
static int hf_ospf_header_version;
static int hf_ospf_header_msg_type;
static int hf_ospf_header_packet_length;
static int hf_ospf_header_src_router;
static int hf_ospf_header_area_id;
static int hf_ospf_header_checksum;
static int hf_ospf_tlv_type;
static int hf_ospf_tlv_length;


/* OSPF v3 Extended LSA TLV's RFC 8362*/
static int hf_ospf_v3_e_lsa_tlv_type;
static int hf_ospf_v3_e_lsa_tlv_length;

/* Header OSPF v2 auth + multi-instance */
static int hf_ospf_header_instance_id;
static int hf_ospf_header_auth_type;
static int hf_ospf_header_auth_data_none;
static int hf_ospf_header_auth_data_simple;
static int hf_ospf_header_auth_crypt_key_id;
static int hf_ospf_header_auth_crypt_data_length;
static int hf_ospf_header_auth_crypt_seq_nbr;
static int hf_ospf_header_auth_crypt_data;
static int hf_ospf_header_auth_data_unknown;

/* Header OSPF v3 */
static int hf_ospf_v3_header_instance_id;
static int hf_ospf_header_reserved;

/* Hello */
static int hf_ospf_hello;
static int hf_ospf_hello_network_mask;
static int hf_ospf_hello_interface_id;
static int hf_ospf_hello_hello_interval;
static int hf_ospf_hello_router_priority;
static int hf_ospf_hello_router_dead_interval;
static int hf_ospf_hello_designated_router;
static int hf_ospf_hello_backup_designated_router;
static int hf_ospf_hello_active_neighbor;

/* Authentication Trailer RFC6506 */
static int hf_ospf_at;
static int hf_ospf_at_auth_type;
static int hf_ospf_at_auth_data_len;
static int hf_ospf_at_reserved;
static int hf_ospf_at_sa_id;
static int hf_ospf_at_crypto_seq_nbr;
static int hf_ospf_at_auth_data;

/* Generated from convert_proto_tree_add_text.pl */
static int hf_ospf_referenced_advertising_router;
static int hf_ospf_v3_lsa_referenced_link_state_id;
static int hf_ospf_mpls_protection_capability;
static int hf_ospf_oif_encoding;
static int hf_ospf_ls_id_te_lsa_reserved;
static int hf_ospf_db_interface_mtu;
static int hf_ospf_v3_lls_full_state_for;
static int hf_ospf_v3_lsa_interface_id;
static int hf_ospf_v3_lsa_router_priority;
static int hf_ospf_v3_lsa_forwarding_address_ipv6;
static int hf_ospf_v3_lls_dropped_neighbor;
static int hf_ospf_v3_lsa_external_route_tag;
static int hf_ospf_tna_addr;
static int hf_ospf_v3_lsa_neighbor_router_id;
static int hf_ospf_mpls_switching_type;
static int hf_ospf_oif_tna_addr_length;
static int hf_ospf_oif_tna_addr_ipv4;
static int hf_ospf_link_state_id;
static int hf_ospf_ls_id_opaque_id;
static int hf_ospf_v2_lls_sequence_number;
static int hf_ospf_v3_lsa_do_not_age;
static int hf_ospf_lls_data_length;
static int hf_ospf_mpls_shared_risk_link_group;
static int hf_ospf_db_dd_sequence;
static int hf_ospf_v3_lsa_destination_router_id;
static int hf_ospf_tna_addr_ipv6;
static int hf_ospf_v3_lsa_link_local_interface_address;
static int hf_ospf_mpls_interface_mtu;
static int hf_ospf_v3_lsa_neighbor_interface_id;
static int hf_ospf_lsa_number_of_links;
static int hf_ospf_v2_lls_auth_data;
static int hf_ospf_v2_lls_li_id;
static int hf_ospf_oif_switching_cap;
static int hf_ospf_ls_number_of_lsas;
static int hf_ospf_v3_lls_neighbor;
static int hf_ospf_v3_lls_request_from;
static int hf_ospf_lls_checksum;
static int hf_ospf_v3_lsa_attached_router;
static int hf_ospf_v3_lsa_referenced_ls_type;
static int hf_ospf_mpls_encoding;
static int hf_ospf_mpls_num_labels;
static int hf_ospf_lsa_external_type;
static int hf_ospf_lsa_tos;
static int hf_ospf_lsa_external_tos;
static int hf_ospf_v3_lsa_type;
static int hf_ospf_metric;
static int hf_ospf_prefix_length;
static int hf_ospf_ls_mpls_pri;
static int hf_ospf_ls_mpls_bc;
static int hf_ospf_mpls_action;
static int hf_ospf_mpls_bandwidth_type;
static int hf_ospf_mpls_bitmap;
static int hf_ospf_mpls_grid;
static int hf_ospf_mpls_cs2;
static int hf_ospf_mpls_n;
static int hf_ospf_mpls_cs;
static int hf_ospf_mpls_length;
static int hf_ospf_mpls_minimum_lsp_bandwidth;
static int hf_ospf_mpls_pri;
static int hf_ospf_mpls_sonet_sdh;
static int hf_ospf_mpls_starting;
static int hf_ospf_mpls_no_effective_bits;
static int hf_ospf_mpls_type;
static int hf_ospf_oif_signal_type;
static int hf_ospf_tlv_value;
static int hf_ospf_oif_node_id;
static int hf_ospf_pad_bytes;
static int hf_ospf_ls_metric;
static int hf_ospf_v3_lsa_forwarding_address_ipv4;
static int hf_ospf_link_local_interface_address_ipv4;
static int hf_ospf_v3_lsa_num_prefixes;
static int hf_ospf_v3_address_prefix_ipv6;
static int hf_ospf_v3_address_prefix_ipv4;

static expert_field ei_ospf_header_reserved;
static expert_field ei_ospf_lsa_bad_length;
static expert_field ei_ospf_lsa_constraint_missing;
static expert_field ei_ospf_lsa_bc_error;
static expert_field ei_ospf_lsa_unknown_type;
static expert_field ei_ospf_unknown_link_subtype;
static expert_field ei_ospf_stlv_length_invalid;

static int ospf_msg_type_to_filter (uint8_t msg_type)
{
    if (msg_type >= OSPF_HELLO &&
        msg_type <= OSPF_LS_ACK)
        return msg_type - OSPF_LS_BASE;
    return -1;
}

static int ospf_ls_type_to_filter (uint8_t ls_type)
{
    if (ls_type >= OSPF_LSTYPE_ROUTER &&
        ls_type <= OSPF_LSTYPE_EXTATTR)
        return ls_type - OSPF_LSTYPE_BASE;
    else if (ls_type >= OSPF_LSTYPE_OP_LINKLOCAL &&
             ls_type <= OSPF_LSTYPE_OP_ASWIDE)
        return OSPF_LSTYPE_OP_BASE;
    else
        return -1;
}

static int ospf_v3_ls_type_to_filter (uint16_t ls_type)
{
    uint16_t function_code;

    function_code = ls_type & 0x1fff;
    if (function_code >= OSPF_V3_LSA_FUNCTION_CODE_ROUTER &&
        function_code <= OSPF_V3_LSA_FUNCTION_CODE_INTRA_AREA_PREFIX)
        return function_code - OSPF_V3_LSA_FUNCTION_CODE_BASE;
    else if (function_code == OSPF_V3_LSA_FUNCTION_CODE_OPAQUE_RI)
        return OSPF_V3_LSA_FUNCTION_CODE_OPAQUE_RI_BASE;
    else
        return -1;
}

static int * const bf_dbd[] = {
    &hf_ospf_dbd_r,
    &hf_ospf_dbd_i,
    &hf_ospf_dbd_m,
    &hf_ospf_dbd_ms,
    NULL
};
static int * const bf_lls_ext_options[] = {
    &hf_ospf_lls_ext_options_rs,
    &hf_ospf_lls_ext_options_lr,
    NULL
};
static int * const bf_v3_lls_ext_options[] = {
    &hf_ospf_v3_lls_ext_options_lr,
    &hf_ospf_v3_lls_ext_options_rs,
    NULL
};

static int * const bf_v3_lls_state_options[] = {
    &hf_ospf_v3_lls_state_options_r,
    &hf_ospf_v3_lls_state_options_a,
    &hf_ospf_v3_lls_state_options_n,
    NULL
};
static int * const bf_v3_lls_relay_options[] = {
    &hf_ospf_v3_lls_relay_options_a,
    &hf_ospf_v3_lls_relay_options_n,
    NULL
};
static int * const bf_v2_router_lsa_flags[] = {
    &hf_ospf_v2_router_lsa_flag_h,
    &hf_ospf_v2_router_lsa_flag_s,
    &hf_ospf_v2_router_lsa_flag_n,
    &hf_ospf_v2_router_lsa_flag_w,
    &hf_ospf_v2_router_lsa_flag_v,
    &hf_ospf_v2_router_lsa_flag_e,
    &hf_ospf_v2_router_lsa_flag_b,
    NULL
};
static int * const bf_v3_router_lsa_flags[] = {
    &hf_ospf_v3_router_lsa_flag_w,
    &hf_ospf_v3_router_lsa_flag_v,
    &hf_ospf_v3_router_lsa_flag_e,
    &hf_ospf_v3_router_lsa_flag_b,
    NULL
};
static int * const bf_v3_as_external_flags[] = {
    &hf_ospf_v3_as_external_flag_e,
    &hf_ospf_v3_as_external_flag_f,
    &hf_ospf_v3_as_external_flag_t,
    NULL
};
static int * const bf_v2_options[] = {
    &hf_ospf_v2_options_dn,
    &hf_ospf_v2_options_o,
    &hf_ospf_v2_options_dc,
    &hf_ospf_v2_options_l,
    &hf_ospf_v2_options_n,
    &hf_ospf_v2_options_mc,
    &hf_ospf_v2_options_e,
    &hf_ospf_v2_options_mt,
    NULL
};
static int * const bf_v2_options_lsa7[] = {
    &hf_ospf_v2_options_dn,
    &hf_ospf_v2_options_o,
    &hf_ospf_v2_options_dc,
    &hf_ospf_v2_options_l,
    &hf_ospf_v2_options_p,
    &hf_ospf_v2_options_mc,
    &hf_ospf_v2_options_e,
    &hf_ospf_v2_options_mt,
    NULL
};
/* Structures for handling the bitfield of the Options field of Optional Router Capabilities LSA (RFC4970). */
static int * const bf_ri_options[] = {
    &hf_ospf_ri_options_grc,
    &hf_ospf_ri_options_grh,
    &hf_ospf_ri_options_srs,
    &hf_ospf_ri_options_tes,
    &hf_ospf_ri_options_p2plan,
    &hf_ospf_ri_options_ete,
    &hf_ospf_ri_options_host,
    NULL
};
static int * const bf_v3_options[] = {
    &hf_ospf_v3_options_at,
    &hf_ospf_v3_options_l,
    &hf_ospf_v3_options_af,
    &hf_ospf_v3_options_dc,
    &hf_ospf_v3_options_r,
    &hf_ospf_v3_options_n,
    &hf_ospf_v3_options_mc,
    &hf_ospf_v3_options_e,
    &hf_ospf_v3_options_v6,
    NULL
};
static int * const bf_v3_prefix_options[] = {
    &hf_ospf_v3_prefix_option_p,
    &hf_ospf_v3_prefix_option_mc,
    &hf_ospf_v3_prefix_option_la,
    &hf_ospf_v3_prefix_option_nu,
    NULL
};
static int * const bf_ospf_epfx_flags[] = {
    &hf_ospf_ls_epfx_flag_a,
    &hf_ospf_ls_epfx_flag_n,
    &hf_ospf_ls_epfx_flag_unknown,
    NULL
};
static int * const bf_ospf_epfx_range_flags[] = {
    &hf_ospf_ls_epfx_range_flag_ia,
    &hf_ospf_ls_epfx_range_flag_unknown,
    NULL
};
static int * const bf_ospf_pfxsid_flags[] = {
    &hf_ospf_ls_pfxsid_flag_np,
    &hf_ospf_ls_pfxsid_flag_m,
    &hf_ospf_ls_pfxsid_flag_e,
    &hf_ospf_ls_pfxsid_flag_v,
    &hf_ospf_ls_pfxsid_flag_l,
    &hf_ospf_ls_pfxsid_flag_unknown,
    NULL
};
static int * const bf_ospf_adjsid_flags[] = {
    &hf_ospf_ls_adjsid_flag_b,
    &hf_ospf_ls_adjsid_flag_v,
    &hf_ospf_ls_adjsid_flag_l,
    &hf_ospf_ls_adjsid_flag_g,
    &hf_ospf_ls_adjsid_flag_p,
    &hf_ospf_ls_adjsid_flag_unknown,
    NULL
};
static int * const bf_ospf_app_sabm_bits[] = {
    &hf_ospf_ls_app_sabm_bits_r,
    &hf_ospf_ls_app_sabm_bits_s,
    &hf_ospf_ls_app_sabm_bits_f,
    &hf_ospf_ls_app_sabm_bits_x,
    NULL,
};
static int * const unidir_link_flags[] = {
    &hf_ospf_ls_unidir_link_flags_a,
    &hf_ospf_ls_unidir_link_flags_reserved,
    NULL,
};
static int * const bf_ospf_fad_def_flags[] = {
    &hf_ospf_ls_fad_def_flags_m,
    NULL,
};
static int * const bf_ospf_fapm_flags[] = {
    &hf_ospf_ls_fapm_flags_e,
    NULL,
};

static void dissect_ospf_hello(tvbuff_t*, int, proto_tree*, uint8_t, uint16_t);
static void dissect_ospf_db_desc(tvbuff_t*, packet_info*, int, proto_tree*, uint8_t, uint16_t, uint8_t);
static void dissect_ospf_ls_req(tvbuff_t*, packet_info*, int, proto_tree*, uint8_t, uint16_t);
static void dissect_ospf_ls_upd(tvbuff_t*, packet_info*, int, proto_tree*, uint8_t, uint16_t, uint8_t);
static void dissect_ospf_ls_ack(tvbuff_t*, packet_info*, int, proto_tree*, uint8_t, uint16_t, uint8_t);
static int dissect_ospf_authentication_trailer(tvbuff_t*, int, proto_tree*);
static int dissect_ospf_lls_data_block(tvbuff_t*, packet_info*, int, proto_tree*, uint8_t);

/* dissect_ospf_v[23]lsa returns the offset of the next LSA
 * if disassemble_body is set to false (e.g. in LSA ACK
 * packets), the offset is set to the offset of the next
 * LSA header
 */
static int dissect_ospf_v2_lsa(tvbuff_t*, packet_info*, int, proto_tree*, bool disassemble_body);
static int dissect_ospf_v3_lsa(tvbuff_t*, packet_info*, int, proto_tree*, bool disassemble_body,
                               uint8_t);

static void dissect_ospf_v3_address_prefix(tvbuff_t *, packet_info *, int, int, proto_tree *, uint8_t);

static int
ospf_has_lls_block(tvbuff_t *tvb, int offset, uint8_t packet_type, uint8_t version)
{
    uint8_t flags;
    uint32_t v3flags;

    /* LLS block can be found only in HELLO and DBDESC packets */
    switch (packet_type) {
    case OSPF_HELLO:
        switch (version) {
        case OSPF_VERSION_2:
            flags = tvb_get_uint8 (tvb, offset + 6);
            return flags & OSPF_V2_OPTIONS_L;
        case OSPF_VERSION_3:
            v3flags = tvb_get_ntohl(tvb, offset + 5);
            v3flags = v3flags >> 8;
            return v3flags & OSPF_V3_OPTIONS_L;
        }
        break;
    case OSPF_DB_DESC:
        switch (version) {
        case OSPF_VERSION_2:
            flags = tvb_get_uint8 (tvb, offset + 2);
            return flags & OSPF_V2_OPTIONS_L;
        case OSPF_VERSION_3:
            v3flags = tvb_get_ntohl(tvb, offset + 1);
            v3flags = v3flags >> 8;
            return v3flags & OSPF_V3_OPTIONS_L;
        }
        break;
    }

    return 0;
}

static int
ospf_has_at_block(tvbuff_t *tvb, int offset, uint8_t packet_type, uint8_t version)
{
    uint32_t v3flags;

    /* AT (Authentication Trailer) block can be found in OSPFv3 HELLO and DD packets */
    switch (packet_type) {
    case OSPF_HELLO:
        switch (version) {
        case OSPF_VERSION_3:
            v3flags = tvb_get_ntohl(tvb, offset + 5);
            v3flags = v3flags >> 8;
            return v3flags & OSPF_V3_OPTIONS_AT;
        }
        break;
    case OSPF_DB_DESC:
        switch (version) {
        case OSPF_VERSION_3:
            v3flags = tvb_get_ntohl(tvb, offset + 1);
            v3flags = v3flags >> 8;
            return v3flags & OSPF_V3_OPTIONS_AT;
        }
        break;
    }

    return 0;
}

static bool
capture_ospf(const unsigned char *pd _U_, int offset _U_, int len _U_, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
{
    capture_dissector_increment_count(cpinfo, proto_ospf);
    return true;
}

static int
dissect_ospf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
    proto_tree *ospf_tree = NULL;
    proto_item *ti, *ti_sum, *hidden_item;
    proto_tree *ospf_header_tree;
    uint8_t version;
    uint8_t packet_type;
    uint16_t ospflen;
    vec_t cksum_vec[4];
    int cksum_vec_len, has_at_block;
    uint32_t phdr[2];
    uint16_t cksum, computed_cksum;
    unsigned length, reported_length;
    uint8_t auth_type;
    int crypto_len = 0;
    unsigned int ospf_header_length;
    uint8_t instance_id;
    uint32_t areaid;
    uint8_t address_family = OSPF_AF_6;
    int offset;

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

    version = tvb_get_uint8(tvb, 0);
    switch (version) {
    case OSPF_VERSION_2:
        ospf_header_length = OSPF_VERSION_2_HEADER_LENGTH;
        break;
    case OSPF_VERSION_3:
        ospf_header_length = OSPF_VERSION_3_HEADER_LENGTH;
        break;
    default:
        ospf_header_length = 14;
        break;
    }

    packet_type = tvb_get_uint8(tvb, 1);
    col_add_str(pinfo->cinfo, COL_INFO,
                val_to_str(pinfo->pool, packet_type, pt_vals, "Unknown (%u)"));

    ospflen = tvb_get_ntohs(tvb, 2);

    ti = proto_tree_add_item(tree, proto_ospf, tvb, 0, -1, ENC_NA);
    ospf_tree = proto_item_add_subtree(ti, ett_ospf);


    ti = proto_tree_add_item(ospf_tree, hf_ospf_header, tvb, 0, ospf_header_length, ENC_NA);
    ospf_header_tree = proto_item_add_subtree(ti, ett_ospf_hdr);

    proto_tree_add_item(ospf_header_tree, hf_ospf_header_version, tvb, 0, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(ospf_header_tree, hf_ospf_header_msg_type, tvb, 1, 1, ENC_BIG_ENDIAN);

    if (ospf_msg_type_to_filter(packet_type) != -1) {
        hidden_item = proto_tree_add_item(ospf_header_tree,
                                          *hf_ospf_msg_type_array[ospf_msg_type_to_filter(packet_type)],
                                          tvb, 1, 1, ENC_BIG_ENDIAN);
        proto_item_set_hidden(hidden_item);
    }
    proto_tree_add_item(ospf_header_tree, hf_ospf_header_packet_length, tvb, 2, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(ospf_header_tree, hf_ospf_header_src_router, tvb, 4, 4, ENC_BIG_ENDIAN);


    ti = proto_tree_add_item_ret_ipv4(ospf_header_tree, hf_ospf_header_area_id, tvb, 8, 4, ENC_BIG_ENDIAN, &areaid);
    if(areaid == 0){
        proto_item_append_text(ti, " (Backbone)");
    }

    ti_sum = proto_tree_add_item_ret_uint16(ospf_header_tree, hf_ospf_header_checksum, tvb, 12, 2, ENC_BIG_ENDIAN, &cksum);
    if(cksum == 0){
        proto_item_append_text(ti_sum, " (None)");
    }

    /* Quit at this point if it's an unknown OSPF version. */
    if(version != OSPF_VERSION_2 && version != OSPF_VERSION_3) {
        return 12;
    }

    length = tvb_captured_length(tvb);
    /* XXX - include only the length from the OSPF header? */
    reported_length = tvb_reported_length(tvb);
    if (cksum !=0 && !pinfo->fragmented && length >= reported_length
               && length >= ospf_header_length) {
        /* The packet isn't part of a fragmented datagram and isn't
           truncated, so we can checksum it. */

        switch (version) {

        case OSPF_VERSION_2:
            /* Header, not including the authentication data (the OSPFv2
               checksum excludes the 64-bit authentication field). */
            SET_CKSUM_VEC_TVB(cksum_vec[0], tvb, 0, 16);
            if (length > ospf_header_length) {
                /* Rest of the packet, again not including the
                   authentication data. */
                reported_length -= ospf_header_length;
                SET_CKSUM_VEC_TVB(cksum_vec[1], tvb, ospf_header_length, reported_length);
                cksum_vec_len = 2;
            } else {
                /* There's nothing but a header. */
                cksum_vec_len = 1;
            }
            break;

        case OSPF_VERSION_3:
            /* IPv6-style checksum, covering the entire OSPF packet
               and a prepended IPv6 pseudo-header. */

            /* Set up the fields of the pseudo-header. */
            SET_CKSUM_VEC_PTR(cksum_vec[0], (const uint8_t *)pinfo->src.data, pinfo->src.len);
            SET_CKSUM_VEC_PTR(cksum_vec[1], (const uint8_t *)pinfo->dst.data, pinfo->dst.len);
            phdr[0] = g_htonl(ospflen);
            phdr[1] = g_htonl(IP_PROTO_OSPFIGP);
            SET_CKSUM_VEC_PTR(cksum_vec[2], (const uint8_t *)&phdr, 8);
            SET_CKSUM_VEC_TVB(cksum_vec[3], tvb, 0, reported_length);
            cksum_vec_len = 4;
            break;

        default:
            DISSECTOR_ASSERT_NOT_REACHED();
            break;
        }
        computed_cksum = in_cksum(cksum_vec, cksum_vec_len);
        /*
         * in_cksum() should never return 0xFFFF here, because, to quote
         * RFC 1624 section 3 "Discussion":
         *
         *     In one's complement, there are two representations of
         *     zero: the all zero and the all one bit values, often
         *     referred to as +0 and -0.  One's complement addition
         *     of non-zero inputs can produce -0 as a result, but
         *     never +0.  Since there is guaranteed to be at least
         *     one non-zero field in the IP header, and the checksum
         *     field in the protocol header is the complement of the
         *     sum, the checksum field can never contain ~(+0), which
         *     is -0 (0xFFFF).  It can, however, contain ~(-0), which
         *     is +0 (0x0000).
         *
         * RFC 1624 is discussing the checksum of the *IPv4* header,
         * where the "version" field is 4, ensuring that, in a valid
         * IPv4 header, there is at least one non-zero field, but it
         * also applies to an OSPF packet, because, for OSPFv2, the
         * header includes a version field with the value 2 and, for
         * OSPFv3, the pseudo-header includes the non-zero IP protocol
         * number for OSPF, so at least one field in the checksummed
         * data is non-zero.
         *
         * in_cksum() returns the negation of the one's-complement
         * sum of all the data handed to it, and that data won't be
         * all zero, so the sum won't be 0 (+0), and thus the negation
         * won't be -0, i.e. won't be 0xFFFF.
         */
        if (computed_cksum == 0) {
            proto_item_append_text(ti_sum, " [correct]");
        } else {
            proto_item_append_text(ti_sum, " [incorrect, should be 0x%04x]", in_cksum_shouldbe(cksum, computed_cksum));
        }
    }

    switch (version) {

    case OSPF_VERSION_2:
        /* Authentication and multi-instance is only valid for OSPFv2 */
        proto_tree_add_item(ospf_header_tree, hf_ospf_header_instance_id, tvb, 14, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item_ret_uint8(ospf_header_tree, hf_ospf_header_auth_type, tvb, 15, 1, ENC_BIG_ENDIAN, &auth_type);
        switch (auth_type) {
        case OSPF_AUTH_NONE:
            proto_tree_add_item(ospf_header_tree, hf_ospf_header_auth_data_none, tvb, 16, 8, ENC_NA);
            break;

        case OSPF_AUTH_SIMPLE:
            proto_tree_add_item(ospf_header_tree, hf_ospf_header_auth_data_simple, tvb, 16, 8, ENC_ASCII);
            break;

        case OSPF_AUTH_CRYPT:
            proto_tree_add_item(ospf_header_tree, hf_ospf_header_auth_crypt_key_id, tvb, 18, 1, ENC_BIG_ENDIAN);

            proto_tree_add_item(ospf_header_tree, hf_ospf_header_auth_crypt_data_length, tvb, 19, 1, ENC_BIG_ENDIAN);
            crypto_len = tvb_get_uint8(tvb, 19);

            proto_tree_add_item(ospf_header_tree, hf_ospf_header_auth_crypt_seq_nbr, tvb, 20, 4, ENC_BIG_ENDIAN);
               /* Show the message digest that was appended to the end of the
               OSPF message - but only if it's present (we don't want
               to get an exception before we've tried dissecting OSPF
               message). */
            if (tvb_bytes_exist(tvb, ospflen, crypto_len)) {
                proto_tree_add_item(ospf_header_tree, hf_ospf_header_auth_crypt_data, tvb, ospflen, crypto_len, ENC_NA);
                proto_tree_set_appendix(ospf_header_tree, tvb, ospflen, crypto_len);
            }
            break;

        default:
            proto_tree_add_item(ospf_header_tree, hf_ospf_header_auth_data_unknown, tvb, 16, 8, ENC_NA);
            break;
        }
        break;

    case OSPF_VERSION_3:
        /* Instance ID and "reserved" is OSPFv3-only */
        proto_tree_add_item_ret_uint8(ospf_header_tree, hf_ospf_v3_header_instance_id, tvb, 14, 1, ENC_BIG_ENDIAN, &instance_id);
        /* By default set address_family to OSPF_AF_6 */
        address_family = OSPF_AF_6;
        if(instance_id > 65 && instance_id < 128) {
            address_family = OSPF_AF_4;
        }

        ti = proto_tree_add_item(ospf_header_tree, hf_ospf_header_reserved, tvb, 15, 1, ENC_NA);
        if(tvb_get_uint8(tvb, 15)){
            expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
        }
        break;

    default:
        DISSECTOR_ASSERT_NOT_REACHED();
        break;
    }

    switch (packet_type){

    case OSPF_HELLO:
        dissect_ospf_hello(tvb, ospf_header_length, ospf_tree, version,
                           (uint16_t)(ospflen - ospf_header_length));
        break;

    case OSPF_DB_DESC:
        dissect_ospf_db_desc(tvb, pinfo, (int)ospf_header_length, ospf_tree, version,
                             (uint16_t)(ospflen - ospf_header_length),
                                 address_family);
        break;

    case OSPF_LS_REQ:
        dissect_ospf_ls_req(tvb, pinfo, (int)ospf_header_length, ospf_tree, version,
                            (uint16_t)(ospflen - ospf_header_length));
        break;

    case OSPF_LS_UPD:
        dissect_ospf_ls_upd(tvb, pinfo, (int)ospf_header_length, ospf_tree, version,
                            (uint16_t)(ospflen - ospf_header_length),
                            address_family);
        break;

    case OSPF_LS_ACK:
        dissect_ospf_ls_ack(tvb, pinfo, (int)ospf_header_length, ospf_tree, version,
                            (uint16_t)(ospflen - ospf_header_length),
                            address_family);
        break;

    default:
        call_data_dissector(tvb_new_subset_remaining(tvb, ospf_header_length), pinfo, tree);
        break;
    }

    offset = ospflen + crypto_len;

    /* Take care of the LLS data block (RFC 5613)
     * This block can only be present in Hello and DB Description packets.
     */
    if (ospf_has_lls_block(tvb, ospf_header_length, packet_type, version)) {
        offset = dissect_ospf_lls_data_block(tvb, pinfo, offset, ospf_tree,
                                    version);
    }

    /* Take care of the AT (Authentication Trailer) data block (RFC 7166)
     * This block can be present in all OSPFv3 packets, but is is only indicated by flags
     * in Hello and DB Description packets. Because Wireshark does not have a neighbor state DB,
     * we expect the AT based on a protocol preference if the indicating flags are not present.
     */
    has_at_block = ospf_has_at_block(tvb, ospf_header_length, packet_type, version);
    if (
        has_at_block || (
            !has_at_block &&
            ospf_v3_expect_at &&
            tvb_reported_length_remaining(tvb, offset)
        )
    ) {
        dissect_ospf_authentication_trailer(tvb, offset, ospf_tree);
    }

    return tvb_captured_length(tvb);
}

static int
dissect_ospfv2_lls_tlv(tvbuff_t *tvb, int offset, proto_tree *tree)
{
    proto_tree *ospf_lls_tlv_tree;
    uint16_t type;
    uint16_t length;

    type = tvb_get_ntohs(tvb, offset);
    length = tvb_get_ntohs(tvb, offset + 2);

    ospf_lls_tlv_tree = proto_tree_add_subtree(tree, tvb, offset, length + 4, ett_ospf_lls_tlv,
                             NULL, val_to_str_const(type, lls_tlv_type_vals, "Unknown LLS TLV"));

    proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_tlv_type, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);

    switch(type) {
    case LLS_V2_EXT_OPT:
        proto_tree_add_bitmask(ospf_lls_tlv_tree, tvb, offset + 4, hf_ospf_lls_ext_options, ett_ospf_lls_ext_options, bf_lls_ext_options, ENC_BIG_ENDIAN);
        break;
    case LLS_V2_CRYPTO_OPT:
        proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_v2_lls_sequence_number, tvb, offset + 4, 4, ENC_BIG_ENDIAN);
        proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_v2_lls_auth_data, tvb, offset + 8, length - 4, ENC_NA);
        break;
    case LLS_V2_LI_ID_OPT:
        proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_v2_lls_li_id, tvb, offset + 4, 4, ENC_NA);
    }

    return offset + length + 4;
}

static int
dissect_ospfv3_lls_tlv(tvbuff_t *tvb, int offset, proto_tree *tree)
{
    proto_item *ti = NULL;
    proto_tree *ospf_lls_tlv_tree = NULL;
    uint16_t type;
    uint16_t length;
    uint8_t relays_added;
    int orig_offset;

    type = tvb_get_ntohs(tvb, offset);
    length = tvb_get_ntohs(tvb, offset + 2);

    switch(type) {
    case LLS_V3_EXT_OPT:
        ti = proto_tree_add_item(tree, hf_ospf_v3_lls_ext_options_tlv, tvb,
                                 offset, length + 4, ENC_NA);
       break;
    case LLS_V3_STATE_CHECK:
        ti = proto_tree_add_item(tree, hf_ospf_v3_lls_state_tlv, tvb,
                                 offset, length + 4, ENC_NA);
        break;
    case LLS_V3_NBR_DROP:
        ti = proto_tree_add_item(tree, hf_ospf_v3_lls_drop_tlv, tvb,
                                 offset, length + 4, ENC_NA);
        break;
    case LLS_V3_RELAYS:
        ti = proto_tree_add_item(tree, hf_ospf_v3_lls_relay_tlv, tvb,
                                 offset, length + 4, ENC_NA);
        break;
    case LLS_V3_WILLING:
        ti = proto_tree_add_item(tree, hf_ospf_v3_lls_willingness_tlv, tvb,
                                 offset, length + 4, ENC_NA);
        break;
    case LLS_V3_RQST_FROM:
         ti = proto_tree_add_item(tree, hf_ospf_v3_lls_rf_tlv, tvb,
                                  offset, length + 4, ENC_NA);
         break;
    case LLS_V3_FULL_STATE:
        ti = proto_tree_add_item(tree, hf_ospf_v3_lls_fsf_tlv, tvb,
                                 offset, length + 4, ENC_NA);
        break;
    default:
        ospf_lls_tlv_tree = proto_tree_add_subtree_format(tree, tvb, offset, length + 4, ett_ospf_lls_tlv, NULL,
                                 "%s", val_to_str_const(type, lls_v3_tlv_type_vals, "Unknown LLS TLV"));
    }

    if (ti != NULL)
        ospf_lls_tlv_tree = proto_item_add_subtree(ti, ett_ospf_lls_tlv);
    proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_tlv_type, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);

    orig_offset = offset;

    switch (type) {
    case LLS_V3_EXT_OPT:
        proto_tree_add_bitmask(ospf_lls_tlv_tree, tvb, offset + 4, hf_ospf_v3_lls_ext_options, ett_ospf_v3_lls_ext_options, bf_v3_lls_ext_options, ENC_BIG_ENDIAN);
        break;
    case LLS_V3_STATE_CHECK:
        proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_v3_lls_state_scs,
                            tvb, offset+4, 2, ENC_BIG_ENDIAN);
        proto_tree_add_bitmask(ospf_lls_tlv_tree, tvb, offset + 6, hf_ospf_v3_lls_state_options, ett_ospf_v3_lls_state_options, bf_v3_lls_state_options, ENC_BIG_ENDIAN);
        break;
    case LLS_V3_NBR_DROP:
        offset += 4;
        while (orig_offset + length >= offset) {
            proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_v3_lls_dropped_neighbor, tvb, offset, 4, ENC_BIG_ENDIAN);
            offset += 4;
        }
        offset = orig_offset;
        break;
    case LLS_V3_RELAYS:
        relays_added = tvb_get_uint8(tvb, offset+4);
        proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_v3_lls_relay_added,
                            tvb, offset+4, 1, ENC_BIG_ENDIAN);
        proto_tree_add_bitmask(ospf_lls_tlv_tree, tvb, offset + 5, hf_ospf_v3_lls_relay_options, ett_ospf_v3_lls_relay_options, bf_v3_lls_relay_options, ENC_BIG_ENDIAN);
        offset += 8;
        while (orig_offset + length >= offset) {
            ti = proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_v3_lls_neighbor, tvb, offset, 4, ENC_BIG_ENDIAN);
            if (relays_added > 0) {
                proto_item_append_text(ti, " Added");
            } else {
                proto_item_append_text(ti, " Deleted");
            }

            relays_added--;
            offset += 4;
        }
        break;
    case LLS_V3_WILLING:
        proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_v3_lls_willingness,
                            tvb, offset+4, 1, ENC_BIG_ENDIAN);

        break;
    case LLS_V3_RQST_FROM:
        offset += 4;
        while (orig_offset + length >= offset) {
            proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_v3_lls_request_from, tvb, offset, 4, ENC_BIG_ENDIAN);
            offset += 4;
        }
        offset = orig_offset;
        break;
    case LLS_V3_FULL_STATE:
           offset += 4;
        while (orig_offset + length >= offset) {
            proto_tree_add_item(ospf_lls_tlv_tree, hf_ospf_v3_lls_full_state_for, tvb, offset, 4, ENC_BIG_ENDIAN);
            offset += 4;
        }
        offset = orig_offset;
        break;
    }

    return offset + length + 4;
}


static int
dissect_ospf_lls_data_block(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree,
                            uint8_t version)
{
    proto_tree *ospf_lls_data_block_tree;
    int ospf_lls_len;
    int orig_offset = offset;
    unsigned length_remaining;

    length_remaining = tvb_reported_length_remaining(tvb, offset);
    if (length_remaining < 4) {
        proto_tree_add_expert_format(tree, pinfo, &ei_ospf_lsa_bad_length,
            tvb, offset, length_remaining, "LLS option bit set but data block missing");
        return offset;
    }

    ospf_lls_len = tvb_get_ntohs(tvb, offset + 2) * 4;
    ospf_lls_data_block_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_ospf_lls_data_block, NULL, "OSPF LLS Data Block");

    /* TODO: verify checksum */
    proto_tree_add_checksum(ospf_lls_data_block_tree, tvb, offset, hf_ospf_lls_checksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
    proto_tree_add_uint(ospf_lls_data_block_tree, hf_ospf_lls_data_length, tvb, offset + 2, 2, ospf_lls_len);

    offset += 4;
    DISSECTOR_ASSERT((version == OSPF_VERSION_2) || (version == OSPF_VERSION_3));
    while (orig_offset + ospf_lls_len > offset) {
        if (version == OSPF_VERSION_2)
            offset = dissect_ospfv2_lls_tlv (tvb, offset, ospf_lls_data_block_tree);
        else
            offset = dissect_ospfv3_lls_tlv (tvb, offset, ospf_lls_data_block_tree);
    }

    return offset;
}

static int
dissect_ospf_authentication_trailer(tvbuff_t *tvb, int offset, proto_tree *tree)
{
    proto_tree *ospf_at_tree;
    proto_item *ti;
    uint32_t auth_data_len;

    ti = proto_tree_add_item(tree, hf_ospf_at, tvb, offset, -1, ENC_NA);
    ospf_at_tree = proto_item_add_subtree(ti, ett_ospf_at);

    proto_tree_add_item(ospf_at_tree, hf_ospf_at_auth_type, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    proto_tree_add_item_ret_uint(ospf_at_tree, hf_ospf_at_auth_data_len, tvb, offset, 2, ENC_BIG_ENDIAN, &auth_data_len);
    offset += 2;
    if (auth_data_len < (2 + 2 + 2 + 8)) {
        /* XXX - report an error here */
        proto_item_set_len(ti, 4);
        return offset;
    }
    proto_item_set_len(ti, auth_data_len);

    proto_tree_add_item(ospf_at_tree, hf_ospf_at_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    proto_tree_add_item(ospf_at_tree, hf_ospf_at_sa_id, tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    proto_tree_add_item(ospf_at_tree, hf_ospf_at_crypto_seq_nbr, tvb, offset, 8, ENC_BIG_ENDIAN);
    offset += 8;

    /* Add Check of Data ? */
    proto_tree_add_item(ospf_at_tree, hf_ospf_at_auth_data, tvb, offset, auth_data_len - ( 2 + 2 + 2 + 2 + 8), ENC_NA);
    offset = auth_data_len;

    return offset;
}

static void
dissect_ospf_hello(tvbuff_t *tvb, int offset, proto_tree *tree, uint8_t version,
                   uint16_t length)
{
    proto_tree *ospf_hello_tree;
    proto_item *ti;
    int orig_offset = offset;

    ti = proto_tree_add_item(tree, hf_ospf_hello, tvb, offset, length, ENC_NA);
    ospf_hello_tree = proto_item_add_subtree(ti, ett_ospf_hello);

    switch (version) {
    case OSPF_VERSION_2:
        proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_network_mask, tvb, offset, 4, ENC_BIG_ENDIAN);
        proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_hello_interval, tvb, offset + 4, 2, ENC_BIG_ENDIAN);
        proto_tree_add_bitmask(ospf_hello_tree, tvb, offset + 6, hf_ospf_v2_options, ett_ospf_v2_options, bf_v2_options, ENC_BIG_ENDIAN);
        proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_router_priority, tvb, offset + 7, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_router_dead_interval, tvb, offset + 8, 4, ENC_BIG_ENDIAN);
        proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_designated_router, tvb, offset + 12, 4, ENC_BIG_ENDIAN);
        proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_backup_designated_router, tvb, offset + 16, 4, ENC_BIG_ENDIAN);
        offset += 20;

        while (orig_offset + length > offset) {
            proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_active_neighbor, tvb, offset, 4, ENC_BIG_ENDIAN);
            offset += 4;
        }
        break;
    case OSPF_VERSION_3:
        proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_interface_id, tvb, offset, 4, ENC_BIG_ENDIAN);
        proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_router_priority, tvb, offset + 4, 1, ENC_BIG_ENDIAN);
        proto_tree_add_bitmask(ospf_hello_tree, tvb, offset + 5, hf_ospf_v3_options, ett_ospf_v3_options, bf_v3_options, ENC_BIG_ENDIAN);
        proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_hello_interval, tvb, offset + 8, 2, ENC_BIG_ENDIAN);
        proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_router_dead_interval, tvb, offset + 10, 2, ENC_BIG_ENDIAN);
        proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_designated_router, tvb, offset + 12, 4, ENC_BIG_ENDIAN);
        proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_backup_designated_router, tvb, offset + 16, 4, ENC_BIG_ENDIAN);
        offset += 20;

        while (orig_offset + length > offset) {
            proto_tree_add_item(ospf_hello_tree, hf_ospf_hello_active_neighbor, tvb, offset, 4, ENC_BIG_ENDIAN);
            offset += 4;
        }
        break;
    }
}

static void
dissect_ospf_db_desc(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree,
                     uint8_t version, uint16_t length, uint8_t address_family)
{
    proto_tree *ospf_db_desc_tree;
    proto_item *ti;
    uint8_t reserved;
    int orig_offset = offset;

    if (tree) {
        ospf_db_desc_tree = proto_tree_add_subtree(tree, tvb, offset, length, ett_ospf_desc, NULL, "OSPF DB Description");

        switch (version ) {

        case OSPF_VERSION_2:
            proto_tree_add_item(ospf_db_desc_tree, hf_ospf_db_interface_mtu, tvb, offset, 2, ENC_BIG_ENDIAN);

            proto_tree_add_bitmask(ospf_db_desc_tree, tvb, offset + 2, hf_ospf_v2_options, ett_ospf_v2_options, bf_v2_options, ENC_BIG_ENDIAN);
            proto_tree_add_bitmask(ospf_db_desc_tree, tvb, offset + 3, hf_ospf_dbd, ett_ospf_dbd, bf_dbd, ENC_BIG_ENDIAN);

            proto_tree_add_item(ospf_db_desc_tree, hf_ospf_db_dd_sequence, tvb, offset + 4, 4, ENC_BIG_ENDIAN);
            break;

        case OSPF_VERSION_3:

            reserved = tvb_get_uint8(tvb, offset);
            ti = proto_tree_add_item(ospf_db_desc_tree, hf_ospf_header_reserved, tvb, offset, 1, ENC_NA);
            if (reserved != 0)
                expert_add_info(pinfo, ti, &ei_ospf_header_reserved);

            proto_tree_add_bitmask(ospf_db_desc_tree, tvb, offset + 1, hf_ospf_v3_options, ett_ospf_v3_options, bf_v3_options, ENC_BIG_ENDIAN);

            proto_tree_add_item(ospf_db_desc_tree, hf_ospf_db_interface_mtu, tvb, offset + 4, 2, ENC_BIG_ENDIAN);

            reserved = tvb_get_uint8(tvb, offset + 6);
            ti = proto_tree_add_item(ospf_db_desc_tree, hf_ospf_header_reserved, tvb, offset + 6, 1, ENC_NA);
            if (reserved != 0)
                expert_add_info(pinfo, ti, &ei_ospf_header_reserved);

            proto_tree_add_bitmask(ospf_db_desc_tree, tvb, offset + 7, hf_ospf_dbd, ett_ospf_dbd, bf_dbd, ENC_BIG_ENDIAN);

            proto_tree_add_item(ospf_db_desc_tree, hf_ospf_db_dd_sequence, tvb, offset + 8, 4, ENC_BIG_ENDIAN);
            break;
        }
    }
    switch (version ) {
    case OSPF_VERSION_2:
        offset += 8;
        break;
    case OSPF_VERSION_3:
        offset += 12;
        break;
    }

    /* LS Headers will be processed here */
    /* skip to the end of DB-Desc header */
    DISSECTOR_ASSERT((version == OSPF_VERSION_2) || (version == OSPF_VERSION_3));
    while (orig_offset + length > offset) {
        if ( version == OSPF_VERSION_2)
            offset = dissect_ospf_v2_lsa(tvb, pinfo, offset, tree, false);
        else
            offset = dissect_ospf_v3_lsa(tvb, pinfo, offset, tree, false, address_family);
    }

}

static void
dissect_ospf_ls_req(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree, uint8_t version,
                    uint16_t length)
{
    proto_item *ti;
    proto_tree *ospf_lsr_tree;
    proto_tree *lsa_type_tree;
    uint16_t reserved;
    int orig_offset = offset;

    /* zero or more LS requests may be within a LS Request */
    /* we place every request for a LSA in a single subtree */
    while (orig_offset + length > offset) {
        ospf_lsr_tree = proto_tree_add_subtree(tree, tvb, offset, OSPF_LS_REQ_LENGTH,
                                 ett_ospf_lsr, NULL, "Link State Request");

        switch ( version ) {

        case OSPF_VERSION_2:
            proto_tree_add_item(ospf_lsr_tree, hf_ospf_ls_type,
                                tvb, offset, 4, ENC_BIG_ENDIAN);
            break;
        case OSPF_VERSION_3:
            reserved = tvb_get_ntohs(tvb, offset);
            ti = proto_tree_add_item(ospf_lsr_tree, hf_ospf_header_reserved, tvb, offset, 2, ENC_NA);
            if (reserved != 0)
                expert_add_info(pinfo, ti, &ei_ospf_header_reserved);

            ti = proto_tree_add_item(ospf_lsr_tree, hf_ospf_v3_ls_type,
                                tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            lsa_type_tree = proto_item_add_subtree(ti, ett_ospf_lsa_type);
            proto_tree_add_item(lsa_type_tree, hf_ospf_v3_ls_type_u, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(lsa_type_tree, hf_ospf_v3_ls_type_s12, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(lsa_type_tree, hf_ospf_v3_ls_type_fc, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            break;
        }


        proto_tree_add_item(ospf_lsr_tree, hf_ospf_link_state_id, tvb, offset + 4, 4, ENC_BIG_ENDIAN);
        proto_tree_add_item(ospf_lsr_tree, hf_ospf_adv_router,
                            tvb, offset + 8, 4, ENC_BIG_ENDIAN);

        offset += 12;
    }
}

static void
dissect_ospf_ls_upd(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree, uint8_t version,
                    uint16_t length, uint8_t address_family)
{
    proto_tree *ospf_lsa_upd_tree;
    uint32_t lsa_nr;
    uint32_t lsa_counter;

    ospf_lsa_upd_tree = proto_tree_add_subtree(tree, tvb, offset, length, ett_ospf_lsa_upd, NULL, "LS Update Packet");

    lsa_nr = tvb_get_ntohl(tvb, offset);
    proto_tree_add_item(ospf_lsa_upd_tree, hf_ospf_ls_number_of_lsas, tvb, offset, 4, ENC_BIG_ENDIAN);
    /* skip to the beginning of the first LSA */
    offset += 4; /* the LS Upd Packet contains only a 32 bit #LSAs field */

    DISSECTOR_ASSERT((version == OSPF_VERSION_2) || (version == OSPF_VERSION_3));
    lsa_counter = 0;
    while (lsa_counter < lsa_nr) {
        if (version == OSPF_VERSION_2)
            offset = dissect_ospf_v2_lsa(tvb, pinfo, offset, ospf_lsa_upd_tree, true);
        else
            offset = dissect_ospf_v3_lsa(tvb, pinfo, offset, ospf_lsa_upd_tree, true,
                                         address_family);
        lsa_counter += 1;
    }
}

static void
dissect_ospf_ls_ack(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree, uint8_t version,
                    uint16_t length, uint8_t address_family)
{
    int orig_offset = offset;
    DISSECTOR_ASSERT((version == OSPF_VERSION_2) || (version == OSPF_VERSION_3));
    /* the body of a LS Ack packet simply contains zero or more LSA Headers */
    while (orig_offset + length > offset) {
        if (version == OSPF_VERSION_2)
            offset = dissect_ospf_v2_lsa(tvb, pinfo, offset, tree, false);
        else
            offset = dissect_ospf_v3_lsa(tvb, pinfo, offset, tree, false, address_family);
    }
}

/*
 * Returns if an LSA is opaque, i.e. requires special treatment
 */
static int
is_opaque(int lsa_type)
{
    return (lsa_type >= OSPF_LSTYPE_OP_LINKLOCAL &&
        lsa_type <= OSPF_LSTYPE_OP_ASWIDE);
}

/* MPLS/TE TLV types */
#define MPLS_TLV_ROUTER    1
#define MPLS_TLV_LINK      2
#define OIF_TLV_TNA    32768

/* MPLS/TE Link STLV types */
enum {
    MPLS_LINK_TYPE       = 1,           /* RFC 3630, OSPF-TE   */
    MPLS_LINK_ID,
    MPLS_LINK_LOCAL_IF,
    MPLS_LINK_REMOTE_IF,
    MPLS_LINK_TE_METRIC,
    MPLS_LINK_MAX_BW,
    MPLS_LINK_MAX_RES_BW,
    MPLS_LINK_UNRES_BW,
    MPLS_LINK_COLOR,
    MPLS_LINK_LOCAL_REMOTE_ID = 11,     /* RFC 4203, GMPLS     */
    MPLS_LINK_PROTECTION = 14,
    MPLS_LINK_IF_SWITCHING_DESC,
    MPLS_LINK_SHARED_RISK_GROUP,
    MPLS_LINK_BANDWIDTH_CONSTRAINT = 17,/* RFC 4124, OSPF-DSTE */
    MPLS_LINK_EXT_ADMIN_GROUP = 26,     /* RFC 7308            */
    MPLS_LINK_UNIDIR_LINK_DELAY,        /* RFC 7471            */
    MPLS_LINK_UNIDIR_LINK_DELAY_MIN_MAX,
    MPLS_LINK_UNIDIR_DELAY_VARIATION,
};

enum {
    MPLS_BANDWIDTH_AVAILABLE       = 1,           /* RFC 3630, OSPF-TE   */
    MPLS_BANDWIDTH_SHARED          = 2
};

/* OIF TLV types */
enum {
    OIF_LOCAL_NODE_ID = 32773,
    OIF_REMOTE_NODE_ID,
    OIF_SONET_SDH_SWITCHING_CAPABILITY,
    OIF_TNA_IPv4_ADDRESS,
    OIF_NODE_ID,
    OIF_TNA_IPv6_ADDRESS,
    OIF_TNA_NSAP_ADDRESS
};

static const value_string mpls_link_stlv_str[] = {
    {MPLS_LINK_TYPE, "Link Type"},
    {MPLS_LINK_ID, "Link ID"},
    {MPLS_LINK_LOCAL_IF, "Local Interface IP Address"},
    {MPLS_LINK_REMOTE_IF, "Remote Interface IP Address"},
    {MPLS_LINK_TE_METRIC, "Traffic Engineering Metric"},
    {MPLS_LINK_MAX_BW, "Maximum Bandwidth"},
    {MPLS_LINK_MAX_RES_BW, "Maximum Reservable Bandwidth"},
    {MPLS_LINK_UNRES_BW, "Unreserved Bandwidth"},
    {MPLS_LINK_COLOR, "Resource Class/Color"},
    {MPLS_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier"},
    {MPLS_LINK_PROTECTION, "Link Protection Type"},
    {MPLS_LINK_IF_SWITCHING_DESC, "Interface Switching Capability Descriptor"},
    {MPLS_LINK_SHARED_RISK_GROUP, "Shared Risk Link Group"},
    {MPLS_LINK_BANDWIDTH_CONSTRAINT, "Bandwidth Constraints"},
    {MPLS_LINK_EXT_ADMIN_GROUP, "Extended Administrative Group"},
    {MPLS_LINK_UNIDIR_LINK_DELAY, "Unidirectional Link Delay"},
    {MPLS_LINK_UNIDIR_LINK_DELAY_MIN_MAX, "Min/Max Unidirectional Link Delay"},
    {MPLS_LINK_UNIDIR_DELAY_VARIATION, "Unidirectional Delay Variation"},
    {OIF_LOCAL_NODE_ID, "Local Node ID"},
    {OIF_REMOTE_NODE_ID, "Remote Node ID"},
    {OIF_SONET_SDH_SWITCHING_CAPABILITY, "Sonet/SDH Interface Switching Capability"},
    {0, NULL},
};

static const value_string mpls_bandwidth_sstlv_str[] = {
    {MPLS_BANDWIDTH_AVAILABLE, "Available Label"},
    {MPLS_BANDWIDTH_SHARED, "Shared Backup Label"},
    {0, NULL},
};

static const range_string mpls_te_tlv_rvals[] = {
    { 3,     32767, "(Assigned via Standards Action)"},
    { 32768, 32777, "(For Experimental Use)"},
    { 32778, 65535, "(Not to be Assigned)"},
    { 0,         0, NULL}
};

static const range_string mpls_te_sub_tlv_rvals[] = {
    { 10,     32767, "(Assigned via Standards Action)"},
    { 32768, 32777, "(For Experimental Use)"},
    { 32778, 65535, "(Not to be Assigned)"},
    { 0,         0, NULL}
};

static const value_string oif_stlv_str[] = {
    {OIF_TNA_IPv4_ADDRESS, "TNA address"},
    {OIF_NODE_ID, "Node ID"},
    {OIF_TNA_IPv6_ADDRESS, "TNA address"},
    {OIF_TNA_NSAP_ADDRESS, "TNA address"},
    {0, NULL},
};

/* Ref. https://www.iana.org/assignments/ospfv2-parameters/ospfv2-parameters.xhtml#instance-ids */
static const range_string ospf_instance_id_rvals[] = {
    {   0,   0, "Base IPv4 Unicast Instance" },
    {   1,   1, "Base IPv4 Multicast Instance" },
    {   2,   2, "Base IPv4 In-band Management Instance" },
    {   3, 127, "Private Use" },
    { 128, 255, "Unassigned" },
    {   0,   0, NULL },
};

/* Ref. https://www.iana.org/assignments/ospfv3-parameters/ospfv3-parameters.xhtml#ospfv3-parameters-9 */
static const range_string ospfv3_instance_id_rvals[] = {
    {   0,   0, "Base IPv6 Unicast AF" },
    {   1,  31, "Base IPv6 Unicast AF (local policy)" },
    {  32,  32, "Base IPv6 Multicast" },
    {  33,  63, "IPv6 Multicast AFs (local policy)" },
    {  64,  64, "Base IPv4 Unicast AF" },
    {  65,  95, "IPv4 Unicast AFs (local policy)" },
    {  96,  96, "Base IPv4 Multicast" },
    {  97, 127, "IPv4 Multicast AFs (local policy)" },
    { 128, 191, "Unassigned" },
    { 192, 255, "Private Use" },
    {   0,   0, NULL },
};

/*
 * Name : dissect_ospf_subtlv_ext_admin_group()
 *
 * Description :
 *
 *   Dissect Extended Administrative Groups Sub-TLV
 *
 * Input :
 *   tvbuff_t * : tvbuffer for packet data
 *   proto_tree * : protocol display tree to fill out.
 *   int : offset into packet data where we are (beginning of the sub_clv value).
 *   int : subtlv type
 *   int : subtlv length
 *
 * Output:
 *   void
 */
static void
dissect_ospf_subtlv_ext_admin_group(tvbuff_t *tvb, proto_tree *tree,
                                    int offset, int subtype _U_, int sublen)
{
    int i;
    uint32_t admin_group;

    /* Number of Extended Admin Groups */
    for (i = 0; i < (sublen / 4); i++) {
        admin_group = tvb_get_uint32(tvb, offset + (i * 4), ENC_BIG_ENDIAN);
        proto_tree_add_uint_format(tree, hf_ospf_ls_ext_admin_group,
                                   tvb, offset + (i * 4), 4, admin_group,
                                   "Extended Admin Group[%d]: 0x%08x",
                                   i, admin_group);
    }
}

/*
 * Dissect MPLS/TE opaque LSA
 */
static void
dissect_ospf_lsa_mpls(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree,
                      uint32_t length)
{
    proto_item *ti, *hidden_item;
    proto_tree *mpls_tree, *cs_tree, *label_tree, *grid_tree;
    proto_tree *tlv_tree;
    proto_tree *stlv_tree;
    proto_tree *sstlv_tree;
    proto_tree *stlv_admingrp_tree = NULL;

    int tlv_type;
    int tlv_length;
    int tlv_end_offset;

    int stlv_type, stlv_len, stlv_offset;
    int sstlv_type, sstlv_len, sstlv_offset;
    int bitmap_length, no_eff_bits, nb_octets;
    int bitmap_offset, bitmap_end_offset;
    uint8_t grid;
    const char *stlv_name;
    const char *sstlv_name;
    uint32_t stlv_admingrp, mask, reserved;
    int i;
    uint8_t switch_cap;
    uint8_t action;
    float tmp_float;

    static const value_string lambda_grid_vals[] = {
        {   1, "DWDM"},
        {   2, "CWDM"},
        {   3, "Flexi"},
        {   0, NULL }
    };

    static const value_string grid1_cs_vals[] = {
        {   1, "100GHz"},
        {   2, "50GHz"},
        {   3, "25GHz"},
        {   4, "12.5GHz"},
        {   0, NULL }
    };
    static const value_string grid2_cs_vals[] = {
        {   1, "20nm"},
        {   0, NULL }
    };
    static const value_string grid3_cs_vals[] = {
        {   5, "6.25GHz"},
        {   0, NULL }
    };

    static const uint8_t allzero[] = { 0x00, 0x00, 0x00 };
    unsigned num_bcs = 0;

    mpls_tree = proto_tree_add_subtree(tree, tvb, offset, length,
                             ett_ospf_lsa_mpls, NULL, "MPLS Traffic Engineering LSA");
    hidden_item = proto_tree_add_item(tree, hf_ospf_ls_mpls,
                                      tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_item_set_hidden(hidden_item);

    while (length != 0) {
        tlv_type = tvb_get_ntohs(tvb, offset);
        tlv_length = tvb_get_ntohs(tvb, offset + 2);
        tlv_end_offset = offset + tlv_length + 4;

        switch (tlv_type) {

        case MPLS_TLV_ROUTER:
            tlv_tree = proto_tree_add_subtree_format(mpls_tree, tvb, offset, tlv_length+4,
                                     ett_ospf_lsa_mpls_router, NULL, "Router Address: %s",
                                     tvb_ip_to_str(pinfo->pool, tvb, offset+4));
            proto_tree_add_uint_format_value(tlv_tree, hf_ospf_tlv_type, tvb, offset, 2, tlv_type, "1 - Router Address");
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset+2, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_ls_mpls_routerid,
                                tvb, offset+4, 4, ENC_BIG_ENDIAN);
            break;

        case MPLS_TLV_LINK:
            tlv_tree = proto_tree_add_subtree(mpls_tree, tvb, offset, tlv_length+4,
                                     ett_ospf_lsa_mpls_link, NULL, "Link Information");
            proto_tree_add_uint_format_value(tlv_tree, hf_ospf_tlv_type, tvb, offset, 2, tlv_type, "2 - Link Information");
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset+2, 2, ENC_BIG_ENDIAN);
            stlv_offset = offset + 4;

            /* Walk down the sub-TLVs for link information */
            while (stlv_offset < tlv_end_offset) {
                stlv_type = tvb_get_ntohs(tvb, stlv_offset);
                stlv_len = tvb_get_ntohs(tvb, stlv_offset + 2);
                stlv_name = val_to_str_const(stlv_type, mpls_link_stlv_str, "Unknown sub-TLV");
                switch (stlv_type) {

                case MPLS_LINK_TYPE:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, "%s: %u - %s", stlv_name,
                                             tvb_get_uint8(tvb, stlv_offset + 4),
                                             val_to_str_const(tvb_get_uint8(tvb, stlv_offset + 4),
                                                              mpls_link_stlv_ltype_str, "Unknown Link Type"));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_mpls_linktype,
                                        tvb, stlv_offset+4, 1,ENC_BIG_ENDIAN);
                    break;

                case MPLS_LINK_ID:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, "%s: %s", stlv_name,
                                             tvb_ip_to_str(pinfo->pool, tvb, stlv_offset + 4));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_mpls_linkid,
                                        tvb, stlv_offset+4, 4, ENC_BIG_ENDIAN);
                    break;

                case MPLS_LINK_LOCAL_IF:
                case MPLS_LINK_REMOTE_IF:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, "%s: %s", stlv_name,
                                             tvb_ip_to_str(pinfo->pool, tvb, stlv_offset + 4));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    /*   The Local/Remote Interface IP Address sub-TLV is TLV type 3/4, and is 4N
                         octets in length, where N is the number of neighbor addresses. */
                    for (i=0; i < stlv_len; i+=4)
                        proto_tree_add_item(stlv_tree,
                                            stlv_type==MPLS_LINK_LOCAL_IF ?
                                            hf_ospf_ls_mpls_local_addr :
                                            hf_ospf_ls_mpls_remote_addr,
                                            tvb, stlv_offset+4+i, 4, ENC_BIG_ENDIAN);
                    break;

                case MPLS_LINK_TE_METRIC:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, "%s: %u", stlv_name,
                                             tvb_get_ntohl(tvb, stlv_offset + 4));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_uint_format(stlv_tree, hf_ospf_ls_mpls_te_metric, tvb, stlv_offset+4, 4,
                                        tvb_get_ntohl(tvb, stlv_offset + 4), "%s: %u", stlv_name,
                                        tvb_get_ntohl(tvb, stlv_offset + 4));
                    break;

                case MPLS_LINK_COLOR:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, "%s: 0x%08x", stlv_name,
                                             tvb_get_ntohl(tvb, stlv_offset + 4));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    stlv_admingrp = tvb_get_ntohl(tvb, stlv_offset + 4);
                    mask = 1;
                    ti = proto_tree_add_item(stlv_tree, hf_ospf_ls_mpls_linkcolor,
                                             tvb, stlv_offset+4, 4, ENC_BIG_ENDIAN);
                    stlv_admingrp_tree = proto_item_add_subtree(ti, ett_ospf_lsa_mpls_link_stlv_admingrp);
                    if (stlv_admingrp_tree == NULL)
                        return;
                    for (i = 0 ; i < 32 ; i++) {
                        if ((stlv_admingrp & mask) != 0) {
                            proto_tree_add_uint_format(stlv_admingrp_tree, hf_ospf_ls_mpls_group, tvb, stlv_offset+4,
                                                4, 1 << i, "Group %d", i);
                        }
                        mask <<= 1;
                    }
                    break;

                case MPLS_LINK_MAX_BW:
                case MPLS_LINK_MAX_RES_BW:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, "%s: %.10g bytes/s (%.0f bits/s)", stlv_name,
                                             tvb_get_ntohieee_float(tvb, stlv_offset + 4),
                                             tvb_get_ntohieee_float(tvb, stlv_offset + 4) * 8.0);
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_float_format(stlv_tree, hf_ospf_ls_mpls_link_max_bw, tvb, stlv_offset+4, 4,
                                        tvb_get_ntohieee_float(tvb, stlv_offset + 4), "%s: %.10g bytes/s (%.0f bits/s)", stlv_name,
                                        tvb_get_ntohieee_float(tvb, stlv_offset + 4),
                                        tvb_get_ntohieee_float(tvb, stlv_offset + 4) * 8.0);
                    break;

                case MPLS_LINK_UNRES_BW:
                    stlv_tree = proto_tree_add_subtree(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, stlv_name);
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    for (i = 0; i < 8; i++) {
                        tmp_float = tvb_get_ntohieee_float(tvb, stlv_offset + 4 + i*4);
                        proto_tree_add_float_format(stlv_tree, hf_ospf_ls_mpls_pri, tvb, stlv_offset+4+(i*4), 4,
                                            tmp_float, "Pri (or TE-Class) %d: %.10g bytes/s (%.0f bits/s)", i,
                                            tmp_float, tmp_float * 8.0);
                    }
                    break;

                case MPLS_LINK_BANDWIDTH_CONSTRAINT:
                    /*
                      The "Bandwidth Constraints" sub-TLV format is illustrated below:

                      0                   1                   2                   3
                      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
                      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                      | BC Model Id   |           Reserved                            |
                      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                      |                       BC0 value                               |
                      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                      //                       . . .                                 //
                      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                      |                       BCh value                               |
                      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                    */

                    stlv_tree = proto_tree_add_subtree(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, stlv_name);

                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);

                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);

                    proto_tree_add_item(stlv_tree, hf_ospf_ls_mpls_bc_model_id,
                                        tvb, stlv_offset+4, 1, ENC_BIG_ENDIAN);

                    /* 3 octets reserved +5, +6 and +7 (all 0x00) */
                    if(tvb_memeql(tvb, stlv_offset+5, allzero, 3) == -1) {
                        proto_tree_add_expert_format(stlv_tree, pinfo, &ei_ospf_header_reserved,
                                            tvb, stlv_offset+5, 3,
                                            "These bytes are reserved and must be 0x00");
                    }

                    if(((stlv_len % 4)!=0)) {
                        proto_tree_add_expert_format(stlv_tree, pinfo, &ei_ospf_lsa_bad_length, tvb, stlv_offset+4, stlv_len,
                                            "Malformed Packet: Length must be N x 4 octets");
                        break;
                    }

                    /* stlv_len should range from 4 to 36 bytes */
                    num_bcs = (stlv_len - 4)/4;

                    if(num_bcs>8) {
                        proto_tree_add_expert_format(stlv_tree, pinfo, &ei_ospf_lsa_bc_error, tvb, stlv_offset+4, stlv_len,
                                            "Malformed Packet: too many BC (%u)", num_bcs);
                        break;
                    }

                    if(num_bcs==0) {
                        proto_tree_add_expert_format(stlv_tree, pinfo, &ei_ospf_lsa_bc_error, tvb, stlv_offset+4, stlv_len,
                                            "Malformed Packet: Bandwidth Constraints sub-TLV with no BC?");
                        break;
                    }

                    for(i = 0; i < (int) num_bcs; i++) {
                        tmp_float = tvb_get_ntohieee_float(tvb, stlv_offset + 8 + i*4);
                        proto_tree_add_float_format(stlv_tree, hf_ospf_ls_mpls_bc, tvb, stlv_offset+8+(i*4), 4,
                                            tmp_float, "BC %d: %.10g bytes/s (%.0f bits/s)", i,
                                            tmp_float, tmp_float * 8.0);
                    }
                    break;

                case MPLS_LINK_LOCAL_REMOTE_ID:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, "%s: %d (0x%x) - %d (0x%x)", stlv_name,
                                             tvb_get_ntohl(tvb, stlv_offset + 4),
                                             tvb_get_ntohl(tvb, stlv_offset + 4),
                                             tvb_get_ntohl(tvb, stlv_offset + 8),
                                             tvb_get_ntohl(tvb, stlv_offset + 8));

                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree,
                                        hf_ospf_ls_mpls_local_ifid,
                                        tvb, stlv_offset+4, 4, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree,
                                        hf_ospf_ls_mpls_remote_ifid,
                                        tvb, stlv_offset+8, 4, ENC_BIG_ENDIAN);
                    break;

                case MPLS_LINK_IF_SWITCHING_DESC:
                    stlv_tree = proto_tree_add_subtree(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, stlv_name);
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    switch_cap = tvb_get_uint8 (tvb, stlv_offset + 4);
                    proto_tree_add_item(stlv_tree, hf_ospf_mpls_switching_type, tvb, stlv_offset + 4, 1, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_mpls_encoding, tvb, stlv_offset+5, 1, ENC_BIG_ENDIAN);
                    for (i = 0; i < 8; i++) {
                        tmp_float = tvb_get_ntohieee_float(tvb, stlv_offset + 8 + i*4);
                        proto_tree_add_float_format(stlv_tree, hf_ospf_ls_mpls_pri, tvb, stlv_offset+8+(i*4), 4,
                                            tmp_float, "Pri %d: %.10g bytes/s (%.0f bits/s)", i,
                                            tmp_float, tmp_float * 8.0);
                    }
                    if (switch_cap >=1 && switch_cap <=4) {           /* PSC-1 .. PSC-4 */
                        tmp_float = tvb_get_ntohieee_float(tvb, stlv_offset + 40);
                        proto_tree_add_float_format_value(stlv_tree, hf_ospf_mpls_minimum_lsp_bandwidth, tvb, stlv_offset+40, 4,
                                            tmp_float, "%.10g bytes/s (%.0f bits/s)",
                                            tmp_float, tmp_float * 8.0);
                        proto_tree_add_item(stlv_tree, hf_ospf_mpls_interface_mtu, tvb, stlv_offset+44, 2, ENC_BIG_ENDIAN);
                    }

                    if (switch_cap == 100) {                         /* TDM */
                        tmp_float = tvb_get_ntohieee_float(tvb, stlv_offset + 40);
                        proto_tree_add_float_format_value(stlv_tree, hf_ospf_mpls_minimum_lsp_bandwidth, tvb, stlv_offset+40, 4,
                                            tmp_float, "%.10g bytes/s (%.0f bits/s)",
                                            tmp_float, tmp_float * 8.0);
                        proto_tree_add_item(stlv_tree, hf_ospf_mpls_sonet_sdh, tvb, stlv_offset+44, 1, ENC_NA);
                    }
                    if (switch_cap == 150) {
                        if(tvb_get_ntohs(tvb, stlv_offset+2) > 36){
                            sstlv_offset = stlv_offset + 40;
                            sstlv_type = tvb_get_ntohs(tvb, sstlv_offset);
                            sstlv_len = tvb_get_ntohs(tvb, sstlv_offset + 2);
                            sstlv_name = val_to_str_const(sstlv_type, mpls_bandwidth_sstlv_str, "Unknown sub-TLV");

                            sstlv_tree = proto_tree_add_subtree(stlv_tree, tvb, sstlv_offset, sstlv_len,ett_ospf_lsa_mpls_bandwidth_sstlv, NULL, sstlv_name);
                            proto_tree_add_item(sstlv_tree, hf_ospf_mpls_bandwidth_type, tvb, sstlv_offset, 2, ENC_BIG_ENDIAN);
                            proto_tree_add_item(sstlv_tree, hf_ospf_mpls_length, tvb, sstlv_offset + 2, 2, ENC_BIG_ENDIAN);
                            proto_tree_add_item(sstlv_tree, hf_ospf_mpls_pri, tvb, sstlv_offset + 4, 1, ENC_NA);
                            proto_tree_add_item_ret_uint8(sstlv_tree, hf_ospf_mpls_action, tvb, sstlv_offset + 8, 1, ENC_NA, &action);
                            proto_tree_add_item(sstlv_tree, hf_ospf_mpls_num_labels, tvb, sstlv_offset + 8, 2, ENC_BIG_ENDIAN);
                            proto_tree_add_item(sstlv_tree, hf_ospf_mpls_length, tvb, sstlv_offset + 10, 2, ENC_BIG_ENDIAN);
                            bitmap_length = tvb_get_ntohs(tvb, sstlv_offset + 10);
                            if(action == 4){
                                bitmap_offset = sstlv_offset + 16;
                                bitmap_end_offset = sstlv_offset + 8 + bitmap_length;
                                label_tree = proto_tree_add_subtree(sstlv_tree, tvb, sstlv_offset + 12, 4,ett_ospf_lsa_mpls_bandwidth_sstlv, NULL, "Base label");
                                proto_tree_add_item(label_tree, hf_ospf_mpls_grid, tvb, sstlv_offset + 12, 1, ENC_NA);
                                proto_tree_add_item(label_tree, hf_ospf_mpls_cs2, tvb, sstlv_offset + 12, 1, ENC_NA);
                                proto_tree_add_item(label_tree, hf_ospf_mpls_n, tvb, sstlv_offset + 14, 2, ENC_BIG_ENDIAN);
                                while(bitmap_offset < bitmap_end_offset){
                                    proto_tree_add_item(sstlv_tree, hf_ospf_mpls_bitmap, tvb, bitmap_offset, 4, ENC_BIG_ENDIAN);
                                    bitmap_offset += 4;
                                }
                            }
                        }
                    }

                    /*   WSON_LSC, see RFC 7579 */
                    if (switch_cap == 151) {
                        sstlv_offset = stlv_offset + 40;
                        sstlv_type = tvb_get_ntohs(tvb, sstlv_offset);
                        sstlv_len = tvb_get_ntohs(tvb, sstlv_offset + 2);
                        sstlv_name = val_to_str_const(sstlv_type, mpls_bandwidth_sstlv_str, "Unknown sub-TLV");
                        sstlv_tree = proto_tree_add_subtree(stlv_tree, tvb, sstlv_offset, sstlv_len,ett_ospf_lsa_mpls_bandwidth_sstlv, NULL, sstlv_name);
                        proto_tree_add_item(sstlv_tree, hf_ospf_mpls_bandwidth_type, tvb, sstlv_offset, 2, ENC_BIG_ENDIAN);
                        proto_tree_add_item(sstlv_tree, hf_ospf_mpls_length, tvb, sstlv_offset + 2, 2, ENC_BIG_ENDIAN);
                        proto_tree_add_item(sstlv_tree, hf_ospf_mpls_pri, tvb, sstlv_offset + 4, 1, ENC_NA);
                        proto_tree_add_item_ret_uint8(sstlv_tree, hf_ospf_mpls_action, tvb, sstlv_offset + 8, 1, ENC_NA, &action);
                        proto_tree_add_item(sstlv_tree, hf_ospf_mpls_num_labels, tvb, sstlv_offset+8, 2, ENC_BIG_ENDIAN);
                        proto_tree_add_item(sstlv_tree, hf_ospf_mpls_length, tvb, sstlv_offset + 10, 2, ENC_BIG_ENDIAN);
                        bitmap_length = tvb_get_ntohs(tvb, sstlv_offset + 10);
                        if(action == 4){
                            bitmap_offset = sstlv_offset + 16;
                            bitmap_end_offset = sstlv_offset + 8 + bitmap_length;
                            grid =((tvb_get_uint8(tvb, sstlv_offset + 12) & 0xE0) >> 5);
                            label_tree = proto_tree_add_subtree(sstlv_tree, tvb, sstlv_offset + 12, 4,ett_ospf_lsa_mpls_bandwidth_sstlv, NULL, "Base label");
                            grid_tree = proto_tree_add_item(label_tree, hf_ospf_mpls_grid, tvb, sstlv_offset + 12, 1, ENC_NA);
                            proto_item_set_text(grid_tree, "Grid: %s (%u)",val_to_str_const(grid, lambda_grid_vals, "Unknown"),
                                                (grid ));
                            switch(grid){
                            case 1:
                                cs_tree = proto_tree_add_item(label_tree, hf_ospf_mpls_cs2, tvb, stlv_offset + 12, 1, ENC_NA);
                                proto_item_set_text(cs_tree, "Channel Spacing: %s (%d)",val_to_str_const((tvb_get_uint8(tvb, stlv_offset + 12) & 0x1E) >> 1, grid1_cs_vals, "Unknown"),
                                         (tvb_get_uint8(tvb, stlv_offset + 12) & 0x1E) >> 1 );
                                break;
                            case 2:
                                cs_tree = proto_tree_add_item(label_tree, hf_ospf_mpls_cs2, tvb, stlv_offset + 12, 1, ENC_NA);
                                proto_item_set_text(cs_tree, "Channel Spacing: %s (%d)",val_to_str_const((tvb_get_uint8(tvb, stlv_offset + 12) & 0x1E) >> 1, grid2_cs_vals, "Unknown"),
                                         (tvb_get_uint8(tvb, stlv_offset + 12) & 0x1E) >> 1 );
                                break;
                            default:
                                proto_tree_add_item(label_tree, hf_ospf_mpls_cs2, tvb, sstlv_offset + 12, 1, ENC_NA);
                                break;
                            }
                            proto_tree_add_item(label_tree, hf_ospf_mpls_n, tvb, sstlv_offset + 14, 2, ENC_BIG_ENDIAN);
                            while(bitmap_offset < bitmap_end_offset){
                                proto_tree_add_item(sstlv_tree, hf_ospf_mpls_bitmap, tvb, bitmap_offset, 4, ENC_BIG_ENDIAN);
                                bitmap_offset += 4;
                            }
                        }
                    }
                    /*   flexi-grid_lsc, see RFC 8363 */
                    if (switch_cap == 152){
                        bitmap_offset = stlv_offset + 40 + 16;
                        no_eff_bits = tvb_get_ntohs(tvb, stlv_offset + 54) & 0x0FFF;
                        if(no_eff_bits % 32 == 0){
                            nb_octets = (( no_eff_bits / 32 ) * 4);
                        }
                        else{
                            nb_octets = ((( no_eff_bits / 32 ) + 1 ) * 4);
                        }
                        bitmap_end_offset = bitmap_offset + nb_octets;
                        proto_tree_add_item(stlv_tree, hf_ospf_mpls_type, tvb, stlv_offset + 40, 2, ENC_BIG_ENDIAN);
                        proto_tree_add_item(stlv_tree, hf_ospf_mpls_length, tvb, stlv_offset + 42, 2, ENC_BIG_ENDIAN);
                        proto_tree_add_item(stlv_tree, hf_ospf_mpls_pri, tvb, stlv_offset + 44, 1, ENC_NA);
                        cs_tree = proto_tree_add_item(stlv_tree, hf_ospf_mpls_cs, tvb, stlv_offset + 52, 1, ENC_NA);
                        proto_item_set_text(cs_tree, "Channel Spacing: %s (%d)",val_to_str_const((tvb_get_uint8(tvb, stlv_offset + 52) & 0xF0) >> 4, grid3_cs_vals, "Unknown"),
                                         (tvb_get_uint8(tvb, stlv_offset + 52) & 0xF0) >> 4 );
                        proto_tree_add_item(stlv_tree, hf_ospf_mpls_starting, tvb, stlv_offset + 52, 4, ENC_BIG_ENDIAN);
                        proto_tree_add_item(stlv_tree, hf_ospf_mpls_no_effective_bits, tvb, stlv_offset + 54, 2, ENC_BIG_ENDIAN);
                        while(bitmap_offset < bitmap_end_offset){
                            proto_tree_add_item(stlv_tree, hf_ospf_mpls_bitmap, tvb, bitmap_offset, 4, ENC_BIG_ENDIAN);
                            bitmap_offset += 4;
                        }
                    }
                    break;
                case MPLS_LINK_PROTECTION:
                    stlv_tree = proto_tree_add_subtree(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, stlv_name);
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_mpls_protection_capability, tvb, stlv_offset+4, 1, ENC_BIG_ENDIAN);
                    break;

                case MPLS_LINK_SHARED_RISK_GROUP:
                    stlv_tree = proto_tree_add_subtree(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, stlv_name);
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    for (i=0; i < stlv_len; i+=4)
                        proto_tree_add_item(stlv_tree, hf_ospf_mpls_shared_risk_link_group, tvb, stlv_offset+4+i, 4, ENC_BIG_ENDIAN);
                    break;

                case MPLS_LINK_EXT_ADMIN_GROUP:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                                              ett_ospf_lsa_mpls_link_stlv, NULL,
                                                              "%s", stlv_name);
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    dissect_ospf_subtlv_ext_admin_group(tvb, stlv_tree, stlv_offset+4, stlv_type, stlv_len);
                    break;

                case MPLS_LINK_UNIDIR_LINK_DELAY:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL,
                                             "%s: %u usec", stlv_name,
                                             tvb_get_uint24(tvb, stlv_offset + 5, ENC_BIG_ENDIAN));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    ti = proto_tree_add_bitmask(stlv_tree, tvb, stlv_offset+4,
                                                hf_ospf_ls_unidir_link_flags,
                                                ett_ospf_lsa_unidir_link_flags,
                                                unidir_link_flags, ENC_NA);
                    reserved = tvb_get_uint8(tvb, stlv_offset) & 0x7f;
                    if (reserved != 0) {
                        expert_add_info_format(pinfo, ti, &ei_ospf_header_reserved,
                                               "Reserved field should be 0");
                    }
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_unidir_link_delay, tvb, stlv_offset+5, 3, ENC_BIG_ENDIAN);
                    break;

                case MPLS_LINK_UNIDIR_LINK_DELAY_MIN_MAX:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL,
                                             "%s: Min/Max %u/%u usec", stlv_name,
                                             tvb_get_uint24(tvb, stlv_offset + 5, ENC_BIG_ENDIAN),
                                             tvb_get_uint24(tvb, stlv_offset + 9, ENC_BIG_ENDIAN));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    ti = proto_tree_add_bitmask(stlv_tree, tvb, stlv_offset+4,
                                                hf_ospf_ls_unidir_link_flags,
                                                ett_ospf_lsa_unidir_link_flags,
                                                unidir_link_flags, ENC_NA);
                    reserved = tvb_get_uint8(tvb, stlv_offset) & 0x7f;
                    if (reserved != 0) {
                        expert_add_info_format(pinfo, ti, &ei_ospf_header_reserved,
                                               "Reserved field should be 0");
                    }
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_unidir_link_delay_min, tvb, stlv_offset+5, 3, ENC_BIG_ENDIAN);
                    ti = proto_tree_add_item_ret_uint(stlv_tree, hf_ospf_ls_unidir_link_reserved, tvb, stlv_offset+8, 1, ENC_NA, &reserved);
                    if (reserved != 0) {
                        expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
                    }
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_unidir_link_delay_max, tvb, stlv_offset+9, 3, ENC_BIG_ENDIAN);
                    break;

                case MPLS_LINK_UNIDIR_DELAY_VARIATION:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL,
                                             "%s: %u usec", stlv_name,
                                             tvb_get_uint24(tvb, stlv_offset + 5, ENC_BIG_ENDIAN));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    ti = proto_tree_add_item_ret_uint(stlv_tree, hf_ospf_ls_unidir_link_reserved, tvb, stlv_offset+4, 1, ENC_NA, &reserved);
                    if (reserved != 0) {
                        expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
                    }
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_unidir_delay_variation, tvb, stlv_offset+5, 3, ENC_BIG_ENDIAN);
                    break;

                case OIF_LOCAL_NODE_ID:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, "%s: %s", stlv_name,
                                             tvb_ip_to_str(pinfo->pool, tvb, stlv_offset + 4));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree,
                                        hf_ospf_ls_oif_local_node_id,
                                        tvb, stlv_offset + 4, 4, ENC_BIG_ENDIAN);
                    break;

                case OIF_REMOTE_NODE_ID:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, "%s: %s", stlv_name,
                                             tvb_ip_to_str(pinfo->pool, tvb, stlv_offset + 4));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree,
                                        hf_ospf_ls_oif_remote_node_id,
                                        tvb, stlv_offset + 4, 4, ENC_BIG_ENDIAN);
                    break;

                case OIF_SONET_SDH_SWITCHING_CAPABILITY:
                    stlv_tree = proto_tree_add_subtree(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, stlv_name);
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_oif_switching_cap, tvb, stlv_offset+4, 1, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_oif_encoding, tvb, stlv_offset+5, 1, ENC_BIG_ENDIAN);
                    for (i = 0; i < (stlv_len - 4) / 4; i++) {
                        proto_tree_add_uint_format(stlv_tree, hf_ospf_oif_signal_type, tvb, stlv_offset+8+(i*4), 4,
                                            tvb_get_uint8(tvb, stlv_offset+8+(i*4)), "%s: %d free timeslots",
                                            val_to_str_ext(pinfo->pool, tvb_get_uint8(tvb, stlv_offset+8+(i*4)),
                                                           &gmpls_sonet_signal_type_str_ext,
                                                           "Unknown Signal Type (%d)"),
                                            tvb_get_ntoh24(tvb, stlv_offset + 9 + i*4));
                    }

                    break;
                default:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_mpls_link_stlv, NULL, "Unknown Link sub-TLV: %u %s", stlv_type,
                                             rval_to_str_const(stlv_type, mpls_te_sub_tlv_rvals, "Unknown"));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s %s", stlv_type, stlv_name,
                                        rval_to_str_const(stlv_type, mpls_te_sub_tlv_rvals, "Unknown"));
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_value, tvb, stlv_offset+4, stlv_len, ENC_NA);
                    break;
                }
                stlv_offset += ((stlv_len+4+3)/4)*4;
            }
            break;

        case OIF_TLV_TNA:
            tlv_tree = proto_tree_add_subtree(mpls_tree, tvb, offset, tlv_length+4,
                                     ett_ospf_lsa_oif_tna, NULL, "TNA Information");
            proto_tree_add_uint_format_value(tlv_tree, hf_ospf_tlv_type, tvb, offset, 2, 32768, "32768 - TNA Information");
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset+2, 2, ENC_BIG_ENDIAN);
            stlv_offset = offset + 4;

            /* Walk down the sub-TLVs for TNA information */
            while (stlv_offset < tlv_end_offset) {
                stlv_type = tvb_get_ntohs(tvb, stlv_offset);
                stlv_len = tvb_get_ntohs(tvb, stlv_offset + 2);

                if (stlv_len < 4) {
                  proto_tree_add_expert_format(tlv_tree, pinfo, &ei_ospf_stlv_length_invalid, tvb, stlv_offset + 2, 2,
                                        "Invalid sub-TLV length: %u", stlv_len);
                  break;
                }

                stlv_name = val_to_str_const(stlv_type, oif_stlv_str, "Unknown sub-TLV");
                switch (stlv_type) {

                case OIF_NODE_ID:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_oif_tna_stlv, NULL, "%s: %s", stlv_name,
                                             tvb_ip_to_str(pinfo->pool, tvb, stlv_offset + 4));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_ipv4_format(stlv_tree, hf_ospf_oif_node_id, tvb, stlv_offset+4, 4,
                                        tvb_get_ntohl(tvb, stlv_offset + 4), "%s: %s", stlv_name,
                                        tvb_ip_to_str(pinfo->pool, tvb, stlv_offset + 4));
                    break;

                case OIF_TNA_IPv4_ADDRESS:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_oif_tna_stlv, NULL, "%s (IPv4): %s", stlv_name,
                                             tvb_ip_to_str(pinfo->pool, tvb, stlv_offset + 8));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s (IPv4)", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_oif_tna_addr_length, tvb, stlv_offset+4, 1, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_oif_tna_addr_ipv4, tvb, stlv_offset+8, stlv_len - 4, ENC_BIG_ENDIAN);
                    break;

                case OIF_TNA_IPv6_ADDRESS:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_oif_tna_stlv, NULL, "%s (IPv6): %s", stlv_name,
                                             tvb_ip6_to_str(pinfo->pool, tvb, stlv_offset + 8));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s (IPv6)", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_oif_tna_addr_length, tvb, stlv_offset+4, 1, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_tna_addr_ipv6, tvb, stlv_offset+8, stlv_len - 4, ENC_NA);
                    break;

                case OIF_TNA_NSAP_ADDRESS:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_len+4,
                                             ett_ospf_lsa_oif_tna_stlv, NULL, "%s (NSAP): %s", stlv_name,
                                             tvb_bytes_to_str(pinfo->pool, tvb, stlv_offset + 8, stlv_len - 4));
                    proto_tree_add_uint_format_value(stlv_tree, hf_ospf_tlv_type, tvb, stlv_offset, 2,
                                        stlv_type, "%u: %s (NSAP)", stlv_type, stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset+2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_oif_tna_addr_length, tvb, stlv_offset+4, 1, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_tna_addr, tvb, stlv_offset+8, stlv_len - 4, ENC_NA);
                    break;

                default:
                    proto_tree_add_expert_format(tlv_tree, pinfo, &ei_ospf_unknown_link_subtype, tvb, stlv_offset, stlv_len+4,
                                        "Unknown Link sub-TLV: %u", stlv_type);
                    break;
                }
                stlv_offset += ((stlv_len+4+3)/4)*4;
            }
            break;
        default:
            tlv_tree = proto_tree_add_subtree_format(mpls_tree, tvb, offset, tlv_length+4,
                                     ett_ospf_lsa_mpls_link, NULL, "Unknown LSA: %u %s", tlv_type,
                                     rval_to_str_const(tlv_type, mpls_te_tlv_rvals, "Unknown"));
            proto_tree_add_uint_format_value(tlv_tree, hf_ospf_tlv_type, tvb, offset, 2, tlv_type, "%u - Unknown %s",
                                tlv_type, rval_to_str_const(tlv_type, mpls_te_tlv_rvals, "Unknown"));
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset+2, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_value, tvb, offset+4, tlv_length, ENC_NA);
            break;
        }

        offset += tlv_length + 4;
        length -= tlv_length + 4;
    }
}

/*
 * Dissect the TLVs within a grace-LSA as defined by RFC 3623 and 5187.
 */
static void dissect_ospf_lsa_grace_tlv (tvbuff_t *tvb, packet_info *pinfo, int offset,
                                        proto_tree *tree, uint32_t length, uint8_t ospf_version)
{
    uint16_t tlv_type;
    uint16_t tlv_length;
    unsigned tlv_total_length; /* The total length of the TLV including the type
                                  and length fields and any padding */
    uint32_t grace_period;
    uint8_t restart_reason;
    proto_tree *tlv_tree;
    proto_item *tree_item;

    while (length > 0)
    {
        tlv_type = tvb_get_ntohs(tvb, offset);
        tlv_length = tvb_get_ntohs(tvb, offset + 2);
        /* The total length of the TLV including the type, length, value and
         * pad bytes (TLVs are padded to 4 octet alignment).
         */
        tlv_total_length = tlv_length + 4 + WS_PADDING_TO_4(tlv_length);

        tree_item = proto_tree_add_item(tree, hf_ospf_grace_tlv, tvb, offset,
                                        tlv_total_length, ENC_NA);
        tlv_tree = proto_item_add_subtree(tree_item, ett_ospf_lsa_grace_tlv);
        proto_tree_add_uint_format_value(tlv_tree, hf_ospf_tlv_type, tvb, offset, 2, tlv_type, "%s (%u)",
                            val_to_str_const(tlv_type, grace_tlv_type_vals, "Unknown grace-LSA TLV"), tlv_type);
        proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);

        if(tlv_type == GRACE_TLV_PERIOD)
        {
            proto_tree_add_item_ret_uint(tlv_tree, hf_ospf_grace_period, tvb, offset + 4, tlv_length, ENC_BIG_ENDIAN, &grace_period);
            proto_item_set_text(tree_item, "Grace Period: %u seconds", grace_period);
        }
        else if(tlv_type == GRACE_TLV_REASON)
        {
            restart_reason = tvb_get_uint8(tvb, offset + 4);
            proto_tree_add_item(tlv_tree, hf_ospf_grace_reason, tvb, offset + 4, tlv_length, ENC_BIG_ENDIAN);
            proto_item_set_text(tree_item, "Restart Reason: %s (%u)",
                                val_to_str_const(restart_reason, restart_reason_vals, "Unknown Restart Reason"),
                                restart_reason);
        }
        else if(tlv_type == GRACE_TLV_IP && ospf_version == OSPF_VERSION_2)
        {
            /* Type 3 is only applicable to OSPFv2. */
            proto_tree_add_item(tlv_tree, hf_ospf_grace_ip, tvb, offset + 4, tlv_length, ENC_BIG_ENDIAN);
            proto_item_set_text(tree_item, "Restart IP: %s", tvb_address_with_resolution_to_str(pinfo->pool, tvb, AT_IPv4, offset + 4));
            break;
        }
        else
        {
            proto_item_set_text(tree_item, "Unknown grace-LSA TLV");
        }

        if (4U + tlv_length < tlv_total_length) {
            proto_tree_add_item(tlv_tree, hf_ospf_pad_bytes, tvb, offset + 4U + tlv_length, tlv_total_length - (4U + tlv_length), ENC_NA);
        }
        offset += tlv_total_length;
        length -= tlv_total_length;
    }
}

/*
 * Dissect the TLVs within a Extended-LSA as defined by RFC 8362
*/
static void dissect_ospf6_e_lsa_tlv(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree,
                           uint32_t length, uint8_t address_family)
{
    int tlv_type;
    unsigned tlv_length;
    uint8_t prefix_length;

    int offset_end = offset + length;

    proto_tree *tlv_tree;

    while(offset < offset_end) {
        tlv_type = tvb_get_ntohs(tvb, offset);
        tlv_length = tvb_get_ntohs(tvb, offset + 2);

        tlv_tree = proto_tree_add_subtree_format(tree, tvb, offset, tlv_length+4,
                                ett_ospf_elsa_pfx_tlv, NULL, "%s", val_to_str_const(tlv_type, ospf6_extended_lsa_tlv_type_vals, "Unknown E-LSA TLV"));

        proto_tree_add_item(tlv_tree, hf_ospf_v3_e_lsa_tlv_type, tvb, offset, 2, ENC_BIG_ENDIAN);

        proto_tree_add_item(tlv_tree, hf_ospf_v3_e_lsa_tlv_length, tvb, offset+2, 2, ENC_BIG_ENDIAN);

        switch(tlv_type)
        {
            case OSPF6_TLV_INTRA_AREA_PREFIX:
            /* metric */
            proto_tree_add_item(tlv_tree, hf_ospf_metric, tvb, offset + 4, 4, ENC_BIG_ENDIAN);

            /* prefix length */
            prefix_length=tvb_get_uint8(tvb, offset + 8);
            proto_tree_add_item(tlv_tree, hf_ospf_prefix_length, tvb, offset + 8, 1, ENC_BIG_ENDIAN);

            /* prefix options */
            proto_tree_add_bitmask(tlv_tree, tvb, offset + 9, hf_ospf_v3_prefix_option, ett_ospf_v3_prefix_options, bf_v3_prefix_options, ENC_BIG_ENDIAN);

            /* address_prefix */
            dissect_ospf_v3_address_prefix(tvb, pinfo, offset + 12, prefix_length, tlv_tree, address_family);

            offset +=  4 + WS_ROUNDUP_4(tlv_length);

            break;
            case OSPF6_TLV_ROUTER_LINK:
                /* Type */
                proto_tree_add_item(tlv_tree, hf_ospf_v3_lsa_type, tvb, offset + 4, 1, ENC_BIG_ENDIAN);
                /* Reserved */
                proto_tree_add_item(tlv_tree, hf_ospf_header_reserved, tvb, offset+5, 1, ENC_NA);
                /* Metric */
                proto_tree_add_item(tlv_tree, hf_ospf_metric, tvb, offset + 6, 2, ENC_BIG_ENDIAN);
                /* Interface ID */
                proto_tree_add_item(tlv_tree, hf_ospf_v3_lsa_interface_id, tvb, offset + 8, 4, ENC_BIG_ENDIAN);
                /* Neighbor Interface ID */
                proto_tree_add_item(tlv_tree, hf_ospf_v3_lsa_neighbor_interface_id, tvb, offset + 12, 4, ENC_BIG_ENDIAN);
                /* Neighbor Router ID */
                proto_tree_add_item(tlv_tree, hf_ospf_v3_lsa_neighbor_router_id, tvb, offset + 16, 4, ENC_BIG_ENDIAN);

                offset +=  4 + WS_ROUNDUP_4(tlv_length);

                break;
            case OSPF6_TLV_IPV6_LL_ADDR:
                /* Ipv6 addr */
                proto_tree_add_item(tlv_tree, hf_ospf_v3_lsa_link_local_interface_address, tvb, offset + 4, 16, ENC_NA);
                offset +=  4 + WS_ROUNDUP_4(tlv_length);
            break;
            case OSPF6_TLV_ATTACHED_ROUTERS:
                proto_tree_add_item(tlv_tree, hf_ospf_v3_lsa_attached_router, tvb, offset+4, 4, ENC_BIG_ENDIAN);
                offset +=  4 + WS_ROUNDUP_4(tlv_length);
            break;
            case OSPF6_TLV_EXTERNAL_PREFIX:
                /* FIXME: first 8 bits unclear in RFC 8362. */
                proto_tree_add_bitmask(tlv_tree, tvb, offset+4, hf_ospf_v3_as_external_flag, ett_ospf_v3_as_external_flags, bf_v3_as_external_flags, ENC_BIG_ENDIAN);

                /* metric */
                proto_tree_add_item(tlv_tree, hf_ospf_metric, tvb, offset+5, 3, ENC_BIG_ENDIAN);
                /* prefix length */
                prefix_length=tvb_get_uint8(tvb, offset+8);
                proto_tree_add_item(tlv_tree, hf_ospf_prefix_length, tvb, offset+8, 1, ENC_BIG_ENDIAN);

                /* prefix options */
                proto_tree_add_bitmask(tlv_tree, tvb, offset + 9, hf_ospf_v3_prefix_option, ett_ospf_v3_prefix_options, bf_v3_prefix_options, ENC_BIG_ENDIAN);

                /* address_prefix */
                dissect_ospf_v3_address_prefix(tvb, pinfo, offset + 12, prefix_length, tlv_tree, address_family);
                offset +=  4 + WS_ROUNDUP_4(tlv_length);

            break;
            default:
                offset +=  4 + WS_ROUNDUP_4(tlv_length);
            break;

        }
    }
}


/*
 * This function dissects the Optional Router capabilities LSA.
 * In case of OSPFv2, the Router Capabilities would be advertized via the first TLV
 * of an RI LSA and in the case of OSPFv3, the router capabilities would be advertized
 * using a special purpose type field value. (RFC 4970)
 * Also, the Dynamic Hostname or FQDN is advertized via a special purpose TLV type.
 * The below function adds the support to handle this as well. (RFC5642).
 */
static void
dissect_ospf_lsa_opaque_ri(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree,
                           uint32_t length)
{
    proto_tree *ri_tree;
    proto_tree *tlv_tree;
    proto_tree *stlv_tree;
    proto_item *ti_tree = NULL;
    proto_item *ti;
    int offset_end = offset + length;

    int tlv_type;
    unsigned tlv_length;
    int tlv_offset, tlv_end_offset;
    uint16_t stlv_type;
    uint16_t stlv_length;
    int stlv_offset;
    const char *tlv_name;
    const char *stlv_name;
    uint32_t range_size;
    uint32_t reserved;
    int i;

    ri_tree = proto_tree_add_subtree(tree, tvb, offset, length,
                             ett_ospf_lsa_opaque_ri, NULL, "Opaque Router Information LSA");

    while (offset < offset_end) {
        tlv_type = tvb_get_ntohs(tvb, offset);
        tlv_length = tvb_get_ntohs(tvb, offset + 2);
        tlv_end_offset = offset + tlv_length + 4;
        tlv_name = val_to_str_const(tlv_type, ri_tlv_type_vals, "Unknown");

        switch(tlv_type) {

        case OPAQUE_TLV_RI:
            tlv_tree = proto_tree_add_subtree_format(ri_tree, tvb, offset, tlv_length+4,
                                    ett_ospf_lsa_ri_tlv, NULL, "%s", val_to_str_const(tlv_type, ri_tlv_type_vals, "Unknown Opaque RI LSA TLV"));

            proto_tree_add_item(tlv_tree, hf_ospf_tlv_type_opaque, tvb, offset, 2, ENC_BIG_ENDIAN);

            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset+2, 2, ENC_BIG_ENDIAN);

            proto_tree_add_bitmask(tlv_tree, tvb, offset + 4, hf_ospf_ri_options, ett_ospf_ri_options, bf_ri_options, ENC_BIG_ENDIAN);
            break;

        case OPAQUE_TLV_DH:
            tlv_tree = proto_tree_add_subtree_format(ri_tree, tvb, offset, tlv_length+4,
                                    ett_ospf_lsa_dh_tlv, NULL, "%s", val_to_str_const(tlv_type, ri_tlv_type_vals, "Unknown Opaque RI LSA TLV"));

            proto_tree_add_item(tlv_tree, hf_ospf_tlv_type_opaque, tvb, offset, 2, ENC_BIG_ENDIAN);

            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset+2, 2, ENC_BIG_ENDIAN);

            proto_tree_add_item(tlv_tree, hf_ospf_dyn_hostname, tvb, offset+4, tlv_length, ENC_ASCII);
            break;

        case OPAQUE_TLV_SA:{
            unsigned sa_number;
            tlv_tree = proto_tree_add_subtree_format(ri_tree, tvb, offset, tlv_length+4,
                                    ett_ospf_lsa_sa_tlv, NULL, "%s", val_to_str_const(tlv_type, ri_tlv_type_vals, "Unknown Opaque RI LSA TLV"));

            proto_tree_add_item(tlv_tree, hf_ospf_tlv_type_opaque, tvb, offset, 2, ENC_BIG_ENDIAN);

            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset+2, 2, ENC_BIG_ENDIAN);

            for(sa_number = 0; sa_number < tlv_length; sa_number++){
                proto_tree_add_item(tlv_tree, hf_ospf_lsa_sa, tvb, offset+sa_number+4, 1, ENC_NA);
            }
            break;
            }

        case OPAQUE_TLV_SLR:
        case OPAQUE_TLV_SRLB:
            tlv_tree = proto_tree_add_subtree_format(ri_tree, tvb, offset, tlv_length + 4,
                                                     ett_ospf_lsa_slr_tlv, &ti_tree, "%s", tlv_name);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_type_opaque, tvb, offset, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item_ret_uint(tlv_tree, hf_ospf_ls_range_size, tvb, offset + 4, 3, ENC_BIG_ENDIAN, &range_size);
            proto_item_append_text(ti_tree, "  (Range Size: %u)", range_size);
            reserved = tvb_get_uint8(tvb, offset + 7);
            ti = proto_tree_add_item(tlv_tree, hf_ospf_header_reserved, tvb, offset + 7, 1, ENC_NA);
            if (reserved != 0) {
                expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
            }
            stlv_offset = offset + 8;

            /* Walk down the sub-TLVs in SID/Label Range TLV */
            while (stlv_offset < tlv_end_offset) {
                uint32_t sid_label;
                stlv_type = tvb_get_ntohs(tvb, stlv_offset);
                stlv_length = tvb_get_ntohs(tvb, stlv_offset + 2);
                stlv_name = val_to_str_const(stlv_type, ext_pfx_stlv_type_vals, "Unknown");

                switch (stlv_type) {

                case SR_STLV_SID_LABEL:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_length + 4,
                                                              ett_ospf_lsa_slr_stlv, &ti_tree,
                                                              "%s Sub-TLV", stlv_name);
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_slr_stlv, tvb, stlv_offset, 2, ENC_BIG_ENDIAN);
                    ti = proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset + 2, 2, ENC_BIG_ENDIAN);
                    if (stlv_length == 3) {
                        sid_label = tvb_get_ntoh24(tvb, stlv_offset + 4);
                    } else if (stlv_length == 4) {
                        sid_label = tvb_get_ntohl(tvb, stlv_offset + 4);
                    } else {
                        /* Invalid sub-TLV length. */
                        proto_item_append_text(ti, " [Invalid length - %u]", stlv_length);
                        proto_tree_add_item(stlv_tree, hf_ospf_tlv_value, tvb, stlv_offset + 4, stlv_length, ENC_NA);
                        break;
                    }
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_sid_label, tvb, stlv_offset + 4, stlv_length, ENC_BIG_ENDIAN);
                    proto_item_append_text(ti_tree, "  (SID/Label: %u)", sid_label);
                    break;

                default:
                    stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_length + 4,
                                                              ett_ospf_lsa_slr_stlv, NULL,
                                                              "%s Sub-TLV: %u", stlv_name, stlv_type);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset + 2, 2, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_value, tvb, stlv_offset + 4, stlv_length, ENC_NA);
                    break;
                }
                stlv_offset += 4 + WS_ROUNDUP_4(stlv_length);
            }
            break;

        case OPAQUE_TLV_SRMS_PREF:
            tlv_tree = proto_tree_add_subtree_format(ri_tree, tvb, offset, tlv_length + 4,
                                    ett_ospf_lsa_srms_tlv, NULL, "%s", val_to_str_const(tlv_type, ri_tlv_type_vals, "Unknown Opaque RI LSA TLV"));
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_type_opaque, tvb, offset, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_ls_preference, tvb, offset + 4, 1, ENC_BIG_ENDIAN);
            reserved = tvb_get_ntoh24(tvb, offset + 5);
            ti = proto_tree_add_item(tlv_tree, hf_ospf_header_reserved, tvb, offset + 5, 3, ENC_NA);
            if (reserved != 0) {
                expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
            }
            break;

        case OPAQUE_TLV_NODE_MSD:
            /* Node MSD (rfc8476) */
            tlv_offset = offset + 4;
            tlv_tree = proto_tree_add_subtree_format(ri_tree, tvb, offset, tlv_length + 4,
                                                     ett_ospf_lsa_node_msd_tlv, &ti_tree, "%s", tlv_name);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_type_opaque, tvb, offset, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            while (tlv_offset + 2 <= tlv_end_offset) {
                proto_tree_add_item(tlv_tree, hf_ospf_ls_igp_msd_type, tvb, tlv_offset, 1, ENC_NA);
                proto_tree_add_item(tlv_tree, hf_ospf_ls_igp_msd_value, tvb, tlv_offset+1, 1, ENC_NA);
                tlv_offset += 2;
            }
            break;

        case OPAQUE_TLV_FLEX_ALGO_DEF:
            /* Flex Algo Definition (FAD) (rfc9350) */
            tlv_tree = proto_tree_add_subtree_format(ri_tree, tvb, offset, tlv_length + 4,
                                                     ett_ospf_lsa_fad_tlv, &ti_tree, "%s", tlv_name);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_type_opaque, tvb, offset, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            proto_item_append_text(ti_tree, "  (%u)", tvb_get_uint8(tvb, offset + 4));
            proto_tree_add_item(tlv_tree, hf_ospf_ls_flex_algorithm, tvb, offset + 4, 1, ENC_NA);
            proto_tree_add_item(tlv_tree, hf_ospf_ls_fad_metric_type, tvb, offset + 5, 1, ENC_NA);
            proto_tree_add_item(tlv_tree, hf_ospf_ls_fad_calc_type, tvb, offset + 6, 1, ENC_NA);
            proto_tree_add_item(tlv_tree, hf_ospf_ls_fad_priority, tvb, offset + 7, 1, ENC_NA);

            /* Walk down sub-TLVs in FAD TLV */
            stlv_offset = offset + 8;
            while (stlv_offset < tlv_end_offset) {
                stlv_type = tvb_get_ntohs(tvb, stlv_offset);
                stlv_length = tvb_get_ntohs(tvb, stlv_offset + 2);
                stlv_name = val_to_str_const(stlv_type, ri_lsa_fad_stlv_type_vals, "Unknown");

                stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_length + 4,
                                                          ett_ospf_lsa_fad_stlv,
                                                          NULL, "%s", stlv_name);
                proto_tree_add_item(stlv_tree, hf_ospf_ls_fad_stlv, tvb, stlv_offset, 2, ENC_BIG_ENDIAN);
                proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset + 2, 2, ENC_BIG_ENDIAN);
                switch (stlv_type) {
                case FAD_EXCLUDE_AG:
                case FAD_INCLUDE_ANY_AG:
                case FAD_INCLUDE_ALL_AG:
                    dissect_ospf_subtlv_ext_admin_group(tvb, stlv_tree, stlv_offset + 4, stlv_type, stlv_length);
                    break;
                case FAD_DEF_FLAGS:
                    proto_tree_add_bitmask(stlv_tree, tvb, stlv_offset + 4, hf_ospf_ls_fad_def_flags, ett_ospf_lsa_fad_def_flags, bf_ospf_fad_def_flags, ENC_BIG_ENDIAN);
                    break;
                case FAD_EXCLUDE_SRLG:
                    for (i = 0; i < stlv_length; i += 4) {
                        proto_tree_add_item(stlv_tree, hf_ospf_ls_srlg, tvb, stlv_offset + 4 + i, 4, ENC_BIG_ENDIAN);
                    }
                    break;
                default:
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_value, tvb, stlv_offset + 4, stlv_length, ENC_NA);
                    break;
                }

                stlv_offset += 4 + WS_ROUNDUP_4(stlv_length);
            }
            break;

        default:
            if (tlv_length > (unsigned)(offset_end - offset)) {
                /* Invalid length, probably not TLV. */
                return;
            }
            tlv_tree = proto_tree_add_subtree_format(ri_tree, tvb, offset, tlv_length+4,
                                    ett_ospf_lsa_unknown_tlv, NULL, "%s  (t=%u, l=%u)",
                                    val_to_str_const(tlv_type, ri_tlv_type_vals, "Unknown Opaque RI LSA TLV"),
                                    tlv_type, tlv_length);

            proto_tree_add_item(tlv_tree, hf_ospf_tlv_type_opaque, tvb, offset, 2, ENC_BIG_ENDIAN);

            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset+2, 2, ENC_BIG_ENDIAN);

            proto_tree_add_item(tlv_tree, hf_ospf_unknown_tlv, tvb, offset+4, tlv_length, ENC_NA);
            break;

        }

        /*
         * RFC 7770, section 2.3: 4-octet aligned, but type, length and padding
         * is not included in the length.
         * */
        offset += 4 + WS_ROUNDUP_4(tlv_length);
    }
}

/*
 * Dissect Extended Prefix Opaque LSA
 *
 * This function dissects the Optional Extended Prefix Opaque LSA.
 * The below function adds the support to handle this as well. (RFC7684).
 */
static void
dissect_ospf_lsa_ext_prefix(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree,
                            uint32_t length)
{
    proto_tree *ep_tree;
    proto_tree *tlv_tree;
    proto_tree *stlv_tree;
    proto_item *ti_tree = NULL;
    proto_item *ti;
    int offset_end = offset + length;

    int tlv_type;
    unsigned tlv_length;
    int tlv_end_offset;
    uint16_t stlv_type;
    uint16_t stlv_length;
    int stlv_offset;
    const char *tlv_name;
    const char *stlv_name;
    uint8_t route_type;
    uint32_t prefix_length;
    uint32_t sid_label;
    uint32_t range_size;
    uint32_t reserved;
    uint32_t metric = 0;

    ep_tree = proto_tree_add_subtree(tree, tvb, offset, length,
                                     ett_ospf_lsa_epfx, NULL, "OSPFv2 Extended Prefix Opaque LSA");

    while (offset < offset_end) {
        tlv_type = tvb_get_ntohs(tvb, offset);
        tlv_length = tvb_get_ntohs(tvb, offset + 2);
        tlv_end_offset = offset + tlv_length + 4;
        tlv_name = val_to_str_const(tlv_type, ext_pfx_tlv_type_vals, "Unknown");

        switch(tlv_type) {

        case EXT_PREFIX_TLV_PREFIX:
            tlv_tree = proto_tree_add_subtree_format(ep_tree, tvb, offset, tlv_length + 4,
                                                     ett_ospf_lsa_epfx_tlv, &ti_tree, "%s TLV", tlv_name);
            proto_tree_add_item(tlv_tree, hf_ospf_ls_epfx_tlv, tvb, offset, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item_ret_uint8(tlv_tree, hf_ospf_ls_epfx_route_type, tvb, offset + 4, 1, ENC_BIG_ENDIAN, &route_type);
            proto_tree_add_item_ret_uint(tlv_tree, hf_ospf_prefix_length, tvb, offset + 5, 1, ENC_BIG_ENDIAN, &prefix_length);
            proto_tree_add_item(tlv_tree, hf_ospf_ls_epfx_af, tvb, offset + 6, 1, ENC_BIG_ENDIAN);
            proto_tree_add_bitmask(tlv_tree, tvb, offset + 7, hf_ospf_ls_epfx_flags, ett_ospf_lsa_epfx_flags, bf_ospf_epfx_flags, ENC_BIG_ENDIAN);
            if (prefix_length != 0) {
                proto_tree_add_item(tlv_tree, hf_ospf_v3_address_prefix_ipv4, tvb, offset + 8, 4, ENC_BIG_ENDIAN);
            }
            proto_item_append_text(ti_tree, "  (Type: %-13s Prefix: %s/%u)",
                                   val_to_str_const(route_type, ext_pfx_tlv_route_vals, "Unknown"),
                                   prefix_length == 0 ? "0.0.0.0" : tvb_ip_to_str(pinfo->pool, tvb, offset + 8),
                                   prefix_length);
            stlv_offset = offset + 8 + (prefix_length != 0 ? 4 : 0);
            break;

        case EXT_PREFIX_TLV_PREFIX_RANGE:
            tlv_tree = proto_tree_add_subtree_format(ep_tree, tvb, offset, tlv_length + 4,
                                                     ett_ospf_lsa_epfx_tlv, &ti_tree, "%s TLV", tlv_name);
            proto_tree_add_item(tlv_tree, hf_ospf_ls_epfx_tlv, tvb, offset, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item_ret_uint(tlv_tree, hf_ospf_prefix_length, tvb, offset + 4, 1, ENC_BIG_ENDIAN, &prefix_length);
            proto_tree_add_item(tlv_tree, hf_ospf_ls_epfx_af, tvb, offset + 5, 1, ENC_BIG_ENDIAN);
            proto_tree_add_item_ret_uint(tlv_tree, hf_ospf_ls_range_size, tvb, offset + 6, 2, ENC_BIG_ENDIAN, &range_size);
            proto_tree_add_bitmask(tlv_tree, tvb, offset + 8, hf_ospf_ls_epfx_range_flags, ett_ospf_lsa_epfx_range_flags, bf_ospf_epfx_range_flags, ENC_BIG_ENDIAN);
            reserved = tvb_get_ntoh24(tvb, offset + 9);
            ti = proto_tree_add_item(tlv_tree, hf_ospf_header_reserved, tvb, offset + 9, 3, ENC_NA);
            if (reserved != 0) {
                expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
            }
            if (prefix_length != 0) {
                proto_tree_add_item(tlv_tree, hf_ospf_v3_address_prefix_ipv4, tvb, offset + 12, 4, ENC_BIG_ENDIAN);
            }
            proto_item_append_text(ti_tree, "  (Range Size: %u, Prefix: %s/%u)",
                                   range_size,
                                   prefix_length == 0 ? "0.0.0.0" : tvb_ip_to_str(pinfo->pool, tvb, offset + 12),
                                   prefix_length);
            stlv_offset = offset + 12 + (prefix_length != 0 ? 4 : 0);
            break;

        default:
            if (tlv_length > (unsigned)(offset_end - offset)) {
                /* Invalid length, probably not TLV. */
                return;
            }
            tlv_tree = proto_tree_add_subtree_format(ep_tree, tvb, offset, tlv_length + 4,
                                                     ett_ospf_lsa_epfx_tlv, NULL,
                                                     "%s TLV: %u - Unknown", tlv_name, tlv_type);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_type_opaque, tvb, offset, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_unknown_tlv, tvb, offset + 4, tlv_length, ENC_NA);
            stlv_offset = offset + 4;
            break;
        }

        if (tlv_type == EXT_PREFIX_TLV_PREFIX || tlv_type == EXT_PREFIX_TLV_PREFIX_RANGE) {
            /* Walk down the sub-TLVs in Extended Link TLV */
            while (stlv_offset < tlv_end_offset) {
                stlv_type = tvb_get_ntohs(tvb, stlv_offset);
                stlv_length = tvb_get_ntohs(tvb, stlv_offset + 2);
                stlv_name = val_to_str_const(stlv_type, ext_pfx_stlv_type_vals, "Unknown");

                stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_length + 4,
                                                          ett_ospf_lsa_epfx_stlv, &ti_tree,
                                                          "%s Sub-TLV", stlv_name);
                proto_tree_add_item(stlv_tree, hf_ospf_ls_epfx_stlv, tvb, stlv_offset, 2, ENC_BIG_ENDIAN);
                ti = proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset + 2, 2, ENC_BIG_ENDIAN);

                switch (stlv_type) {

                case SR_STLV_PREFIX_SID:
                    if (stlv_length == 7) {
                        sid_label = tvb_get_ntoh24(tvb, stlv_offset + 8);
                    } else if (stlv_length == 8) {
                        sid_label = tvb_get_ntohl(tvb, stlv_offset + 8);
                    } else {
                        /* Invalid sub-TLV length. */
                        proto_item_append_text(ti, " [Invalid length - %u]", stlv_length);
                        proto_tree_add_item(stlv_tree, hf_ospf_tlv_value, tvb, stlv_offset + 4, stlv_length, ENC_NA);
                        break;
                    }
                    proto_tree_add_bitmask(stlv_tree, tvb, stlv_offset + 4, hf_ospf_ls_pfxsid_flags, ett_ospf_lsa_pfxsid_flags, bf_ospf_pfxsid_flags, ENC_BIG_ENDIAN);
                    reserved = tvb_get_uint8(tvb, stlv_offset + 5);
                    ti = proto_tree_add_item(stlv_tree, hf_ospf_header_reserved, tvb, stlv_offset + 5, 1, ENC_NA);
                    if (reserved != 0) {
                        expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
                    }
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_elink_mt_id, tvb, stlv_offset + 6, 1, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_lsa_sa, tvb, stlv_offset + 7, 1, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_sid_label, tvb, stlv_offset + 8, (stlv_length - 4), ENC_BIG_ENDIAN);
                    proto_item_append_text(ti_tree, "  (SID/Label: %u)",sid_label);
                    break;

                case SR_STLV_FLEX_ALGO_PREFIX_METRIC:
                    if (stlv_length != 8) {
                        proto_item_append_text(ti, " [Invalid length - %u]", stlv_length);
                        proto_tree_add_item(stlv_tree, hf_ospf_tlv_value, tvb, stlv_offset + 4, stlv_length, ENC_NA);
                        break;
                    }
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_flex_algorithm, tvb, stlv_offset + 4, 1, ENC_NA);
                    proto_tree_add_bitmask(stlv_tree, tvb, stlv_offset + 5, hf_ospf_ls_fapm_flags, ett_ospf_lsa_fapm_flags, bf_ospf_fapm_flags, ENC_NA);
                    reserved = tvb_get_ntoh24(tvb, stlv_offset + 6);
                    ti = proto_tree_add_item(stlv_tree, hf_ospf_header_reserved, tvb, stlv_offset + 6, 3, ENC_NA);
                    if (reserved != 0) {
                        expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
                    }
                    proto_tree_add_item_ret_uint(stlv_tree, hf_ospf_ls_fapm_metric, tvb, stlv_offset + 8, 4, ENC_BIG_ENDIAN, &metric);
                    proto_item_append_text(ti_tree, "  (Metric: %u)", metric);
                    break;

                default:
                    proto_item_append_text(ti, "  (t=%u, l=%u)", stlv_type, stlv_length);
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_value, tvb, stlv_offset + 4, stlv_length, ENC_NA);
                    break;
                }
                stlv_offset += 4 + WS_ROUNDUP_4(stlv_length);
            }
        }

        /*
         * RFC 7770, section 2.3: 4-octet aligned, but type, length and padding
         * is not included in the length.
         * */
        offset += 4 + WS_ROUNDUP_4(tlv_length);
    }
}

/*
 * Dissect Application-Specific Link Attributes Sub-Sub-TLVs
 */
static void
dissect_ospf_lsa_app_link_attributes(tvbuff_t *tvb, packet_info *pinfo _U_, int offset, proto_tree *tree,
                                     uint32_t length)
{
    proto_tree *stlv_tree = NULL;
    proto_item *ti_tree = NULL, *ti = NULL;
    int offset_end = offset + length;
    int stlv_offset = offset;
    uint16_t stlv_type, stlv_length;
    const char *stlv_name;
    uint32_t delay, delay_min, delay_max, reserved;
    uint32_t admin_group, te_metric;
    int i;

    while (stlv_offset < offset_end) {
        stlv_type = tvb_get_ntohs(tvb, stlv_offset);
        stlv_length = tvb_get_ntohs(tvb, stlv_offset + 2);
        stlv_name = val_to_str_const(stlv_type, ext_link_stlv_type_vals, "Unknown");

        stlv_tree = proto_tree_add_subtree_format(tree, tvb, stlv_offset, stlv_length + 4,
                                                  ett_ospf_lsa_app_link_attrs_stlv, &ti_tree,
                                                  "%s Sub-TLV", stlv_name);
        proto_tree_add_item(stlv_tree, hf_ospf_ls_app_link_attrs_stlv, tvb, stlv_offset, 2, ENC_BIG_ENDIAN);
        proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset + 2, 2, ENC_BIG_ENDIAN);
        stlv_offset += 4;

        switch (stlv_type) {
        case SR_STLV_SRLG:
            /* 11: Shared Risk Link Group */
            for (i = 0; i < stlv_length; i += 4) {
                proto_tree_add_item(stlv_tree, hf_ospf_ls_srlg, tvb, stlv_offset + i, 4, ENC_BIG_ENDIAN);
            }
            break;
        case SR_STLV_UNIDIR_LINK_DELAY:
            /* 12: Unidirectional Link Delay (rfc7471) */
            ti = proto_tree_add_bitmask(stlv_tree, tvb, stlv_offset,
                                        hf_ospf_ls_unidir_link_flags,
                                        ett_ospf_lsa_unidir_link_flags,
                                        unidir_link_flags, ENC_NA);
            reserved = tvb_get_uint8(tvb, stlv_offset) & 0x7f;
            if (reserved != 0) {
                expert_add_info_format(pinfo, ti, &ei_ospf_header_reserved,
                                       "Reserved field should be 0");
            }
            delay = tvb_get_uint24(tvb, stlv_offset + 1, ENC_BIG_ENDIAN);
            proto_tree_add_item(stlv_tree, hf_ospf_ls_unidir_link_delay, tvb, stlv_offset + 1, 3, ENC_BIG_ENDIAN);
            if (ti_tree) {
                proto_item_append_text(ti_tree, "  (Delay: %u usec)", delay);
            }
            break;

        case SR_STLV_UNIDIR_LINK_DELAY_MIN_MAX:
            /* 13: Min/Max Unidirectional Link Delay (rfc7471) */
            ti = proto_tree_add_bitmask(stlv_tree, tvb, stlv_offset,
                                        hf_ospf_ls_unidir_link_flags,
                                        ett_ospf_lsa_unidir_link_flags,
                                        unidir_link_flags, ENC_NA);
            reserved = tvb_get_uint8(tvb, stlv_offset) & 0x7f;
            if (reserved != 0) {
                expert_add_info_format(pinfo, ti, &ei_ospf_header_reserved,
                                       "Reserved field should be 0");
            }
            delay_min = tvb_get_uint24(tvb, stlv_offset + 1, ENC_BIG_ENDIAN);
            proto_tree_add_item(stlv_tree, hf_ospf_ls_unidir_link_delay_min, tvb, stlv_offset+1, 3, ENC_BIG_ENDIAN);
            ti = proto_tree_add_item_ret_uint(stlv_tree, hf_ospf_ls_unidir_link_reserved, tvb, stlv_offset+4, 1, ENC_NA, &reserved);
            if (reserved != 0) {
                expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
            }
            proto_tree_add_item_ret_uint(stlv_tree, hf_ospf_ls_unidir_link_delay_max, tvb, stlv_offset+5, 3, ENC_BIG_ENDIAN, &delay_max);
            if (ti_tree) {
                proto_item_append_text(ti_tree, "  (Min/Max Delay: %u/%u usec)", delay_min, delay_max);
            }
            break;

        case SR_STLV_UNIDIR_DELAY_VARIATION:
            /* 14: Unidirectional Delay Variation (rfc7471) */
            ti = proto_tree_add_item_ret_uint(stlv_tree, hf_ospf_ls_unidir_link_reserved, tvb, stlv_offset, 1, ENC_NA, &reserved);
            if (reserved != 0) {
                expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
            }
            proto_tree_add_item_ret_uint(stlv_tree, hf_ospf_ls_unidir_delay_variation, tvb, stlv_offset + 1, 3, ENC_BIG_ENDIAN, &delay);
            if (ti_tree) {
                proto_item_append_text(ti_tree, "  (Variation: %u usec)", delay);
            }
            break;

        case SR_STLV_ADMIN_GROUP:
            /* 19: Administrative Group (rfc3630) */
            proto_tree_add_item_ret_uint(stlv_tree, hf_ospf_ls_admin_group, tvb, stlv_offset, 4, ENC_BIG_ENDIAN, &admin_group);
            if (ti_tree) {
                proto_item_append_text(ti_tree, "  (Admin Group: 0x%08x)", admin_group);
            }
            break;

        case SR_STLV_EXT_ADMIN_GROUP:
            /* 20: Extended Administrative Group (rfc7308) */
            dissect_ospf_subtlv_ext_admin_group(tvb, stlv_tree, stlv_offset, stlv_type, stlv_length);
            break;

        case SR_STLV_TE_METRIC:
            /* 22: TE Metric (rfc3630) */
            proto_tree_add_item_ret_uint(stlv_tree, hf_ospf_ls_mpls_te_metric, tvb, stlv_offset, 4, ENC_BIG_ENDIAN, &te_metric);
            if (ti_tree) {
                proto_item_append_text(ti_tree, "  (TE Metric: %u)", te_metric);
            }
            break;

        default:
            proto_tree_add_item(stlv_tree, hf_ospf_tlv_value, tvb, stlv_offset, stlv_length, ENC_NA);
            break;
        }

        stlv_offset += WS_ROUNDUP_4(stlv_length);
    }
}

/*
 * Dissect Extended Link Opaque LSA
 *
 * This function dissects the Optional Extended Link Opaque LSA.
 * The below function adds the support to handle this as well. (RFC7684).
 */
static void
dissect_ospf_lsa_ext_link(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree,
                          uint32_t length)
{
    proto_tree *el_tree;
    proto_tree *tlv_tree;
    proto_tree *stlv_tree;
    proto_item *ti_tree = NULL;
    proto_item *ti;
    int offset_end = offset + length;

    int tlv_type;
    unsigned tlv_length;
    int tlv_end_offset;
    uint16_t stlv_type;
    uint16_t stlv_length;
    int stlv_offset;
    const char *tlv_name;
    const char *stlv_name;
    uint8_t link_type;
    uint32_t sid_label;
    uint32_t reserved;
    int local_offset;
    uint16_t local_length;
    uint32_t local_id = 0, remote_id = 0;
    uint8_t sabm_length = 0, udabm_length = 0;

    el_tree = proto_tree_add_subtree(tree, tvb, offset, length,
                                     ett_ospf_lsa_elink, NULL, "OSPFv2 Extended Link Opaque LSA");

    while (offset < offset_end) {
        tlv_type = tvb_get_ntohs(tvb, offset);
        tlv_length = tvb_get_ntohs(tvb, offset + 2);
        tlv_end_offset = offset + tlv_length + 4;
        tlv_name = val_to_str_const(tlv_type, ext_link_tlv_type_vals, "Unknown");

        switch(tlv_type) {

        case EXT_LINK_TLV_LINK:
            tlv_tree = proto_tree_add_subtree_format(el_tree, tvb, offset, tlv_length + 4,
                                                     ett_ospf_lsa_elink_tlv, &ti_tree, "%s TLV", tlv_name);
            proto_tree_add_item(tlv_tree, hf_ospf_ls_elink_tlv, tvb, offset, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);

            link_type = tvb_get_uint8(tvb, offset + 4);
            ti = proto_tree_add_item(tlv_tree, hf_ospf_ls_router_linktype, tvb, offset + 4, 1, ENC_BIG_ENDIAN);
            proto_item_append_text(ti, " - %s",
                                   val_to_str_const(link_type, ospf_v3_lsa_type_vals, "Unknown link type"));
            proto_item_append_text(ti_tree, "  (Type: %-8s ID: %-15s Data: %s)",
                                   val_to_str_const(link_type, ospf_v3_lsa_type_short_vals, "Unknown"),
                                   tvb_ip_to_str(pinfo->pool, tvb, offset + 8),
                                   tvb_ip_to_str(pinfo->pool, tvb, offset + 12));
            reserved = tvb_get_ntoh24(tvb, offset + 5);
            ti = proto_tree_add_item(tlv_tree, hf_ospf_header_reserved, tvb, offset + 5, 3, ENC_NA);
            if (reserved != 0) {
                expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
            }
            proto_tree_add_item(tlv_tree, hf_ospf_ls_router_linkid, tvb, offset + 8, 4, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_ls_router_linkdata, tvb, offset + 12, 4, ENC_BIG_ENDIAN);
            stlv_offset = offset + 16;

            /* Walk down the sub-TLVs in Extended Link TLV */
            while (stlv_offset + 4 <= tlv_end_offset) {
                stlv_type = tvb_get_ntohs(tvb, stlv_offset);
                stlv_length = tvb_get_ntohs(tvb, stlv_offset + 2);
                stlv_name = val_to_str_const(stlv_type, ext_link_stlv_type_vals, "Unknown");

                stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_length + 4,
                                                          ett_ospf_lsa_elink_stlv, &ti_tree,
                                                          "%s Sub-TLV", stlv_name);
                proto_tree_add_item(stlv_tree, hf_ospf_ls_elink_stlv, tvb, stlv_offset, 2, ENC_BIG_ENDIAN);
                ti = proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset + 2, 2, ENC_BIG_ENDIAN);
                switch (stlv_type) {
                case SR_STLV_ADJSID:
                    if (stlv_length == 7) {
                        sid_label = tvb_get_ntoh24(tvb, stlv_offset + 8);
                    } else if (stlv_length == 8) {
                        sid_label = tvb_get_ntohl(tvb, stlv_offset + 8);
                    } else {
                        /* Invalid sub-TLV length. */
                        proto_item_append_text(ti, " [Invalid length - %u]", stlv_length);
                        proto_tree_add_item(stlv_tree, hf_ospf_tlv_value, tvb, stlv_offset + 4, stlv_length, ENC_NA);
                        break;
                    }
                    proto_tree_add_bitmask(stlv_tree, tvb, stlv_offset + 4, hf_ospf_ls_adjsid_flags, ett_ospf_lsa_adjsid_flags, bf_ospf_adjsid_flags, ENC_BIG_ENDIAN);
                    reserved = tvb_get_uint8(tvb, offset + 5);
                    ti = proto_tree_add_item(stlv_tree, hf_ospf_header_reserved, tvb, stlv_offset + 5, 1, ENC_NA);
                    if (reserved != 0) {
                        proto_item_append_text(ti, " [incorrect, should be 0]");
                    }
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_elink_mt_id, tvb, stlv_offset + 6, 1, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_elink_weight, tvb, stlv_offset + 7, 1, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_sid_label, tvb, stlv_offset + 8, (stlv_length - 4), ENC_BIG_ENDIAN);
                    proto_item_append_text(ti_tree, "  (SID/Label: %u)", sid_label);
                    break;

                case SR_STLV_LAN_ADJSID:
                    if (stlv_length == 11) {
                        sid_label = tvb_get_ntoh24(tvb, stlv_offset + 12);
                    } else if (stlv_length == 12) {
                        sid_label = tvb_get_ntohl(tvb, stlv_offset + 12);
                    } else {
                        /* Invalid sub-TLV length. */
                        proto_item_append_text(ti, " [Invalid length - %u]", stlv_length);
                        proto_tree_add_item(stlv_tree, hf_ospf_tlv_value, tvb, stlv_offset + 4, stlv_length, ENC_NA);
                        break;
                    }
                    proto_tree_add_bitmask(stlv_tree, tvb, stlv_offset + 4, hf_ospf_ls_adjsid_flags, ett_ospf_lsa_adjsid_flags, bf_ospf_adjsid_flags, ENC_BIG_ENDIAN);
                    reserved = tvb_get_uint8(tvb, offset + 5);
                    ti = proto_tree_add_item(stlv_tree, hf_ospf_header_reserved, tvb, stlv_offset + 5, 1, ENC_NA);
                    if (reserved != 0) {
                        expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
                    }
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_elink_mt_id, tvb, stlv_offset + 6, 1, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_elink_weight, tvb, stlv_offset + 7, 1, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_elink_nbr, tvb, stlv_offset + 8, 4, ENC_BIG_ENDIAN);
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_sid_label, tvb, stlv_offset + 12, (stlv_length - 8), ENC_BIG_ENDIAN);
                    proto_item_append_text(ti_tree, "  (SID/Label: %u, Neighbor: %s)",
                                           sid_label, tvb_ip_to_str(pinfo->pool, tvb, stlv_offset + 8));
                    break;

                case SR_STLV_LINK_MSD:
                    /* Link MSD Sub-TLV (rfc8476) */
                    local_length = stlv_length;
                    local_offset = stlv_offset + 4;
                    while (local_length >= 2) {
                        proto_tree_add_item(stlv_tree, hf_ospf_ls_igp_msd_type, tvb, local_offset, 1, ENC_NA);
                        proto_tree_add_item(stlv_tree, hf_ospf_ls_igp_msd_value, tvb, local_offset+1, 1, ENC_NA);
                        local_offset += 2;
                        local_length -= 2;
                    }
                    break;

                case SR_STLV_REMOTE_IPV4_ADDRESS:
                    /* Remote IPv4 Address Sub-TLV (rfc8379) */
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_remote_ipv4_addr, tvb, stlv_offset + 4, 4, ENC_BIG_ENDIAN);
                    proto_item_append_text(ti_tree, "  (%s)", tvb_ip_to_str(pinfo->pool, tvb, stlv_offset + 4));
                    break;

                case SR_STLV_LOCAL_REMOTE_INTERFACE_ID:
                    /* Local/Remote Interface ID Sub-TLV (rfc8379) */
                    proto_tree_add_item_ret_uint(stlv_tree, hf_ospf_ls_local_interface_id, tvb, stlv_offset + 4, 4, ENC_BIG_ENDIAN, &local_id);
                    proto_tree_add_item_ret_uint(stlv_tree, hf_ospf_ls_remote_interface_id, tvb, stlv_offset + 8, 4, ENC_BIG_ENDIAN, &remote_id);
                    proto_item_append_text(ti_tree, "  (Local: %u, Remote: %u)", local_id, remote_id);
                    break;

                case SR_STLV_APP_SPEC_LINK_ATTR:
                    /* Application-Specific Link Attributes Sub-TLV (rfc9492) */
                    local_length = stlv_length;
                    local_offset = stlv_offset + 4;
                    proto_tree_add_item_ret_uint8(stlv_tree, hf_ospf_ls_app_sabm_length, tvb, local_offset, 1, ENC_NA, &sabm_length);
                    proto_tree_add_item_ret_uint8(stlv_tree, hf_ospf_ls_app_udabm_length, tvb, local_offset + 1, 1, ENC_NA, &udabm_length);
                    reserved = tvb_get_uint16(tvb, local_offset + 2, ENC_BIG_ENDIAN);
                    ti = proto_tree_add_item(stlv_tree, hf_ospf_header_reserved, tvb, local_offset + 2, 2, ENC_NA);
                    if (reserved != 0) {
                        expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
                    }
                    local_offset += 4;
                    local_length -= 4;
                    if (sabm_length > 0 ) {
                        proto_tree_add_bitmask(stlv_tree, tvb, local_offset,
                                               hf_ospf_ls_app_sabm_bits,
                                               ett_ospf_lsa_app_sabm_bits,
                                               bf_ospf_app_sabm_bits, ENC_NA);
                        local_offset += sabm_length;
                        local_length -= sabm_length;
                    }
                    if (udabm_length > 0) {
                        proto_tree_add_item(stlv_tree, hf_ospf_ls_app_udabm_bits,
                                            tvb, local_offset, udabm_length, ENC_NA);
                        local_offset += udabm_length;
                        local_length -= udabm_length;
                    }
                    /* Link Attribute Sub-TLVs */
                    if (local_length > 4) {
                        dissect_ospf_lsa_app_link_attributes(tvb, pinfo, local_offset, stlv_tree, local_length);
                    }
                    break;

                default:
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_value, tvb, stlv_offset + 4, stlv_length, ENC_NA);
                    proto_item_append_text(ti_tree, "  (t=%u, l=%u)", stlv_type, stlv_length);
                    break;
                }
                stlv_offset += 4 + WS_ROUNDUP_4(stlv_length);
            }
            break;

        default:
            if (tlv_length > (unsigned)(offset_end - offset)) {
                /* Invalid length, probably not TLV. */
                return;
            }
            tlv_tree = proto_tree_add_subtree_format(el_tree, tvb, offset, tlv_length + 4,
                                                     ett_ospf_lsa_elink_tlv, NULL,
                                                     "%s TLV: %u - Unknown", tlv_name, tlv_type);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_type_opaque, tvb, offset, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_unknown_tlv, tvb, offset + 4, tlv_length, ENC_NA);
            break;

        }

        /*
         * RFC 7770, section 2.3: 4-octet aligned, but type, length and padding
         * is not included in the length.
         * */
        offset += 4 + WS_ROUNDUP_4(tlv_length);
    }
}

/*
 * Dissect Extended Inter-Area ASBR LSA
 *
 * This function dissects the Optional Extended Inter-Area ASBR LSA.
 * The below function adds the support to handle this as well. (RFC9350).
 */
static void
dissect_ospf_lsa_ext_ia_asbr(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree, uint32_t length)
{
    proto_tree *eia_tree;
    proto_tree *tlv_tree;
    proto_tree *stlv_tree;
    proto_item *ti_tree = NULL;
    proto_item *ti = NULL;
    int offset_end = offset + length;

    uint16_t tlv_type;
    uint16_t tlv_length;
    int tlv_offset_end;
    uint16_t stlv_type;
    uint16_t stlv_length;
    int stlv_offset, stlv_offset_end;
    const char *tlv_name;
    const char *stlv_name;
    uint32_t reserved, metric;

    eia_tree = proto_tree_add_subtree(tree, tvb, offset, length, ett_ospf_lsa_eia_asbr, NULL,
                                      "OSPFv2 Extended Inter-Area ASBR LSA");

    while (offset + 4 <= offset_end) {
        tlv_type = tvb_get_ntohs(tvb, offset);
        tlv_length = tvb_get_ntohs(tvb, offset + 2);
        tlv_offset_end = offset + tlv_length + 4;
        tlv_name = val_to_str_const(tlv_type, ext_ia_asbr_tlv_type_vals, "Unknown");

        switch(tlv_type) {
        case EXT_IA_ASBR_TLV_EIA_ASBR:
            tlv_tree = proto_tree_add_subtree_format(eia_tree, tvb, offset, tlv_length + 4,
                                                     ett_ospf_lsa_eia_asbr_tlv, &ti_tree,
                                                     "%s TLV", tlv_name);
            proto_tree_add_item(tlv_tree, hf_ospf_ls_eia_asbr_tlv, tvb, offset, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            if (tlv_length < 4 || tlv_offset_end > offset_end) {
                proto_tree_add_expert_format(tlv_tree, pinfo,
                                             &ei_ospf_stlv_length_invalid, tvb, offset + 2, 2,
                                             "Invalid TLV length: %u", tlv_length);
                return;
            }
            proto_tree_add_item(tlv_tree, hf_ospf_ls_eia_asbr_asbr_routerid, tvb, offset + 4, 4, ENC_BIG_ENDIAN);
            proto_item_append_text(ti_tree, "  (ASBR: %s)",
                                   tvb_ip_to_str(pinfo->pool, tvb, offset + 4));
            stlv_offset = offset + 8;

            /* Walk down the sub-TLVs in Extended Inter-Area ASBR TLV */
            while (stlv_offset + 4 <= tlv_offset_end) {
                stlv_type = tvb_get_ntohs(tvb, stlv_offset);
                stlv_length = tvb_get_ntohs(tvb, stlv_offset + 2);
                stlv_offset_end = stlv_offset + stlv_length + 4;
                stlv_name = val_to_str_const(stlv_type, ext_ia_asbr_stlv_type_vals, "Unknown");

                stlv_tree = proto_tree_add_subtree_format(tlv_tree, tvb, stlv_offset, stlv_length + 4,
                                                          ett_ospf_lsa_eia_asbr_stlv, &ti_tree,
                                                          "%s Sub-TLV", stlv_name);
                proto_tree_add_item(stlv_tree, hf_ospf_ls_eia_asbr_stlv, tvb, stlv_offset, 2, ENC_BIG_ENDIAN);
                proto_tree_add_item(stlv_tree, hf_ospf_tlv_length, tvb, stlv_offset + 2, 2, ENC_BIG_ENDIAN);
                if (stlv_offset_end > offset_end) {
                    proto_tree_add_expert_format(stlv_tree, pinfo,
                                                 &ei_ospf_stlv_length_invalid, tvb, stlv_offset + 2, 2,
                                                 "Invalid sub-TLV length: %u", stlv_length);
                    return;
                }
                switch (stlv_type) {
                case SR_STLV_FLEX_ALGO_ASBR_METRIC:
                    /* Flexible Algorithm ASBR Metric (FAAM) */
                    if (stlv_length != 8) {
                        proto_tree_add_expert_format(stlv_tree, pinfo,
                                                     &ei_ospf_stlv_length_invalid, tvb, stlv_offset + 2, 2,
                                                     "Invalid sub-TLV length: %u (should be 8)", stlv_length);
                        break;
                    }
                    proto_tree_add_item(stlv_tree, hf_ospf_ls_flex_algorithm, tvb, stlv_offset + 4, 1, ENC_NA);
                    reserved = tvb_get_uint24(tvb, stlv_offset + 5, ENC_BIG_ENDIAN);
                    ti = proto_tree_add_item(stlv_tree, hf_ospf_header_reserved, tvb, stlv_offset + 5, 3, ENC_NA);
                    if (reserved != 0) {
                        expert_add_info(pinfo, ti, &ei_ospf_header_reserved);
                    }
                    proto_tree_add_item_ret_uint(stlv_tree, hf_ospf_ls_faam_metric, tvb, stlv_offset + 8, 4, ENC_BIG_ENDIAN, &metric);
                    proto_item_append_text(ti_tree, "  (Metric: %u)", metric);
                    break;

                default:
                    proto_tree_add_item(stlv_tree, hf_ospf_tlv_value, tvb, stlv_offset + 4, stlv_length, ENC_NA);
                    proto_item_append_text(ti_tree, "  (t=%u, l=%u)", stlv_type, stlv_length);
                    break;
                }
                stlv_offset += 4 + WS_ROUNDUP_4(stlv_length);
            }
            break;

        default:
            if (tlv_length > (unsigned)(offset_end - offset)) {
                /* Invalid length, probably not TLV. */
                return;
            }
            tlv_tree = proto_tree_add_subtree_format(eia_tree, tvb, offset, tlv_length + 4,
                                                     ett_ospf_lsa_eia_asbr_tlv, NULL,
                                                     "%s TLV: %u - Unknown", tlv_name, tlv_type);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_type_opaque, tvb, offset, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_tlv_length, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
            proto_tree_add_item(tlv_tree, hf_ospf_unknown_tlv, tvb, offset + 4, tlv_length, ENC_NA);
            break;

        }

        /*
         * RFC 7770, section 2.3: 4-octet aligned, but type, length and padding
         * is not included in the length.
         * */
        offset += 4 + WS_ROUNDUP_4(tlv_length);
    }
}

/*
 * Dissect opaque LSAs
 */
static void
dissect_ospf_lsa_opaque(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree,
                        uint8_t ls_id_type, uint32_t length)
{
    switch (ls_id_type) {

    case OSPF_LSA_MPLS_TE:
        dissect_ospf_lsa_mpls(tvb, pinfo, offset, tree, length);
        break;
    case OSPF_LSA_OPAQUE_RI:
        dissect_ospf_lsa_opaque_ri(tvb, pinfo, offset, tree, length);
        break;
    case OSPF_LSA_GRACE:
        dissect_ospf_lsa_grace_tlv(tvb, pinfo, offset, tree, length, OSPF_VERSION_2);
        break;
    case OSPF_LSA_EXT_PREFIX:
        dissect_ospf_lsa_ext_prefix(tvb, pinfo, offset, tree, length);
        break;
    case OSPF_LSA_EXT_LINK:
        dissect_ospf_lsa_ext_link(tvb, pinfo, offset, tree, length);
        break;
    case OSPF_LSA_EXT_IA_ASBR:
        dissect_ospf_lsa_ext_ia_asbr(tvb, pinfo, offset, tree, length);
        break;

    default:
        proto_tree_add_expert_format(tree, pinfo, &ei_ospf_lsa_unknown_type, tvb, offset, length,
                            "Unknown LSA Type %u", ls_id_type);
        break;
    } /* switch on opaque LSA id */
}

static int
dissect_ospf_v2_lsa(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree,
                    bool disassemble_body)
{
    proto_tree *ospf_lsa_tree;
    proto_item *ti, *lsa_ti, *hidden_item;

    uint8_t              ls_type;
    uint16_t             ls_length;
    int                  end_offset;
    uint32_t             nr_links;
    uint16_t             nr_metric;

    /* router LSA */
    uint8_t              link_type;
    uint16_t             metric_counter;
    const char          *metric_type_str;

    /* AS-external LSA */
    uint8_t              options;

    /* opaque LSA */
    uint8_t              ls_id_type;

    uint8_t              ls_length_constraints[] = { 0, 24, 28, 28, 28, 36, 20, 36, 20, 20, 20, 20 };

    ls_type = tvb_get_uint8(tvb, offset + 3);
    ls_length = tvb_get_ntohs(tvb, offset + 18);
    end_offset = offset + ls_length;

    ospf_lsa_tree = proto_tree_add_subtree_format(tree, tvb, offset,
                        disassemble_body?ls_length:OSPF_LSA_HEADER_LENGTH,
                        ett_ospf_lsa, &lsa_ti, "LSA-type %d (%s), len %d",
                        ls_type, val_to_str_const(ls_type, ls_type_vals, "Unknown"),
                        ls_length);
    proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_age, tvb,
                        offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_donotage, tvb,
                        offset, 2, ENC_BIG_ENDIAN);
    options = tvb_get_uint8 (tvb, offset + 2);
    if (ls_type != 7)
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset + 2, hf_ospf_v2_options, ett_ospf_v2_options, bf_v2_options, ENC_BIG_ENDIAN);
    else
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset + 2, hf_ospf_v2_options, ett_ospf_v2_options, bf_v2_options_lsa7, ENC_BIG_ENDIAN);
    proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_type, tvb,
                        offset + 3, 1, ENC_BIG_ENDIAN);
    if (ospf_ls_type_to_filter(ls_type) != -1) {
        hidden_item = proto_tree_add_item(ospf_lsa_tree,
                                          *hf_ospf_ls_type_array[ospf_ls_type_to_filter(ls_type)], tvb,
                                          offset + 3, 1, ENC_BIG_ENDIAN);
        proto_item_set_hidden(hidden_item);
    }

    if (options & OSPF_V2_OPTIONS_MT) {
        metric_type_str = "MT-ID";
    } else {
        metric_type_str = "TOS";
    }

    if (is_opaque(ls_type)) {
        ls_id_type = tvb_get_uint8(tvb, offset + 4);
        proto_tree_add_uint(ospf_lsa_tree, hf_ospf_ls_opaque_type,
                            tvb, offset + 4, 1, ls_id_type);

        switch (ls_id_type) {

        case OSPF_LSA_MPLS_TE:
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_id_te_lsa_reserved, tvb, offset + 5, 1, ENC_BIG_ENDIAN);
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_mpls_te_instance,
                                tvb, offset + 6, 2, ENC_BIG_ENDIAN);
            break;

        case OSPF_LSA_OPAQUE_RI:
        default:
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_id_opaque_id, tvb, offset + 5, 3, ENC_BIG_ENDIAN);
            break;
        }
    } else {
        ls_id_type = 0;
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_id, tvb,
                            offset + 4, 4, ENC_BIG_ENDIAN);
    }

    proto_tree_add_item(ospf_lsa_tree, hf_ospf_adv_router,
                        tvb, offset + 8, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_seqnum, tvb,
                        offset + 12, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_chksum, tvb,
                        offset + 16, 2, ENC_BIG_ENDIAN);
    ti = proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_length, tvb,
                        offset + 18, 2, ENC_BIG_ENDIAN);

    if(ls_type && ls_type <= OSPF_LSTYPE_OP_ASWIDE) {
        if(ls_length < ls_length_constraints[ls_type]) {
            expert_add_info_format(pinfo, ti, &ei_ospf_lsa_bad_length, "Invalid LSA length (%u) for type %s, expected >= (%u)",
                                ls_length, val_to_str_const(ls_type, ls_type_vals, "Unknown"), ls_length_constraints[ls_type]);
            return -1;
        }
    } else if(ls_length < 20) { /* As type is unknown, we check for a minimum length of 20 */
        expert_add_info_format(pinfo, ti, &ei_ospf_lsa_bad_length, "Invalid LSA length (%u) for unknown LSA type (%u), expected minimum of (20)", ls_length, ls_type);
        return -1;
    }

    /* skip past the LSA header to the body */
    offset += OSPF_LSA_HEADER_LENGTH;
    if (ls_length <= OSPF_LSA_HEADER_LENGTH)
        return offset;  /* no data, or bogus length */
    ls_length -= OSPF_LSA_HEADER_LENGTH;

    if (!disassemble_body)
        return offset;

    switch (ls_type){

    case OSPF_LSTYPE_ROUTER:
        /* flags field in an router-lsa */
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset, hf_ospf_v2_router_lsa_flag, ett_ospf_v2_router_lsa_flags, bf_v2_router_lsa_flags, ENC_BIG_ENDIAN);
        /* TODO: flags are only 1 byte, so there is an apparently unused byte here */
        proto_tree_add_item_ret_uint(ospf_lsa_tree, hf_ospf_lsa_number_of_links, tvb, offset + 2, 2, ENC_BIG_ENDIAN, &nr_links);

        offset += 4;

        /* nr_links links follow
         * maybe we should put each of the links into its own subtree ???
         */
        for (unsigned link_counter = 0; link_counter < nr_links; link_counter++) {
            proto_tree *ospf_lsa_router_link_tree;
            proto_item *ti_item;


            /* check the Link Type and ID */
            link_type = tvb_get_uint8(tvb, offset + 8);
            nr_metric = tvb_get_uint8(tvb, offset + 9);

            ospf_lsa_router_link_tree = proto_tree_add_subtree_format(ospf_lsa_tree, tvb, offset, 12 + 4 * nr_metric,
                                           ett_ospf_lsa_router_link, NULL, "Type: %-8s ID: %-15s Data: %-15s Metric: %d",
                                           val_to_str_const(link_type, ospf_v3_lsa_type_short_vals, "Unknown"),
                                           tvb_ip_to_str(pinfo->pool, tvb, offset),
                                           tvb_ip_to_str(pinfo->pool, tvb, offset + 4),
                                           tvb_get_ntohs(tvb, offset + 10));

            ti_item = proto_tree_add_item(ospf_lsa_router_link_tree, hf_ospf_ls_router_linkid,
                        tvb, offset, 4, ENC_BIG_ENDIAN);
            proto_item_append_text(ti_item, " - %s", val_to_str_const(link_type, ospf_v3_lsa_link_id_vals, "Unknown link ID"));

            /* link_data should be specified in detail (e.g. network mask) (depends on link type)*/
            proto_tree_add_item(ospf_lsa_router_link_tree, hf_ospf_ls_router_linkdata,
                        tvb, offset +4, 4, ENC_BIG_ENDIAN);

            ti_item = proto_tree_add_item(ospf_lsa_router_link_tree, hf_ospf_ls_router_linktype,
                        tvb, offset + 8, 1, ENC_BIG_ENDIAN);
            proto_item_append_text(ti_item, " - %s", val_to_str_const(link_type, ospf_v3_lsa_type_vals, "Unknown link type"));

            ti_item = proto_tree_add_item(ospf_lsa_router_link_tree, hf_ospf_ls_router_nummetrics,
                                tvb, offset + 9, 1, ENC_BIG_ENDIAN);
            proto_item_append_text(ti_item, " - %s", metric_type_str);
            proto_tree_add_item(ospf_lsa_router_link_tree, hf_ospf_ls_router_metric0,
                                tvb, offset + 10, 2, ENC_BIG_ENDIAN);

            offset += 12;

            /* nr_metric metrics may follow each link
             * According to RFC4915 the TOS metrics was never deployed and was subsequently deprecated,
             * but decoding still present because MT-ID use the same structure.
             */
            for (metric_counter = 0; metric_counter < nr_metric; metric_counter++) {
                proto_tree_add_uint_format(ospf_lsa_router_link_tree, hf_ospf_ls_metric, tvb, offset, 4,
                                    tvb_get_ntohs(tvb, offset + 2), "%s: %u, Metric: %u",
                                    metric_type_str,
                                    tvb_get_uint8(tvb, offset),
                                    tvb_get_ntohs(tvb, offset + 2));
                offset += 4;
            }
        }
        break;

    case OSPF_LSTYPE_NETWORK:
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_network_netmask,
                            tvb, offset, 4, ENC_BIG_ENDIAN);
        offset += 4;

        if (offset == end_offset)
                proto_tree_add_expert_format(ospf_lsa_tree, pinfo, &ei_ospf_lsa_constraint_missing, tvb, offset - 4, 4, "1 or more router-IDs required");

        while (offset < end_offset) {
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_network_attachrtr,
                                tvb, offset, 4, ENC_BIG_ENDIAN);
            offset += 4;
        }
        break;

    case OSPF_LSTYPE_SUMMARY:
        /* Type 3 and 4 LSAs have the same format */
    case OSPF_LSTYPE_ASBR:
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_asbr_netmask,
                            tvb, offset, 4, ENC_BIG_ENDIAN);
        offset += 4;

        if ((offset+4) > end_offset)
                expert_add_info_format(pinfo, lsa_ti, &ei_ospf_lsa_constraint_missing, "1 or more TOS metrics required");

        while (offset < end_offset) {
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_lsa_tos, tvb, offset, 1, ENC_NA);
            offset += 1;
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_metric, tvb, offset, 3,
                                ENC_BIG_ENDIAN);
            offset += 3;
        }
        break;

    case OSPF_LSTYPE_ASEXT:
    case OSPF_LSTYPE_ASEXT7:
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_asext_netmask,
                            tvb, offset, 4, ENC_BIG_ENDIAN);
        offset += 4;

        if ((offset+12) > end_offset)
                expert_add_info_format(pinfo, lsa_ti, &ei_ospf_lsa_constraint_missing, "1 or more TOS forwarding blocks required");

        while (offset < end_offset) {
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_lsa_external_type, tvb, offset, 1, ENC_NA);
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_lsa_external_tos, tvb, offset, 1, ENC_NA);
            offset += 1;

            proto_tree_add_item(ospf_lsa_tree, hf_ospf_metric, tvb, offset, 3, ENC_BIG_ENDIAN);
            offset += 3;

            proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_asext_fwdaddr,
                                tvb, offset, 4, ENC_BIG_ENDIAN);
            offset += 4;

            proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_asext_extrtrtag,
                                tvb, offset, 4, ENC_BIG_ENDIAN);
            offset += 4;
        }
        break;

    case OSPF_LSTYPE_OP_LINKLOCAL:
    case OSPF_LSTYPE_OP_AREALOCAL:
    case OSPF_LSTYPE_OP_ASWIDE:
        /*
         * RFC 2370 opaque LSAs.
         */
        dissect_ospf_lsa_opaque(tvb, pinfo, offset, ospf_lsa_tree, ls_id_type,
                                ls_length);
        offset += ls_length;
        break;

    default:
        /* unknown LSA type */
        expert_add_info(pinfo, ti, &ei_ospf_lsa_unknown_type);
        offset += ls_length;
        break;
    }
    /* return the offset of the next LSA */
    return offset;
}

/* dissect common elements of the Network E-LSA and LSA */
static void dissect_ospf_v3_network_lsa_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *ospf_lsa_tree, int *offset, uint16_t *ls_length)
{
    /* reserved field */
    uint8_t reserved = tvb_get_uint8(tvb, *offset);
    proto_item *ti = proto_tree_add_item(ospf_lsa_tree, hf_ospf_header_reserved, tvb, *offset, 1, ENC_NA);
    if (reserved != 0)
        expert_add_info(pinfo, ti, &ei_ospf_header_reserved);

    /* options field in an network-lsa */
    proto_tree_add_bitmask(ospf_lsa_tree, tvb, *offset + 1, hf_ospf_v3_options, ett_ospf_v3_options, bf_v3_options, ENC_BIG_ENDIAN);

    *offset += 4;
    *ls_length-=4;
}

static int
dissect_ospf_v3_lsa(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *tree,
                    bool disassemble_body, uint8_t address_family)
{
    proto_tree *ospf_lsa_tree, *router_tree = NULL, *router_entry_tree, *lsa_type_tree;
    proto_item *ti, *hidden_item, *type_item;

    uint16_t             ls_type;
    uint16_t             ls_length;
    int                  end_offset;
    uint8_t              reserved;

    /* router LSA */
    uint32_t             number_prefixes;
    uint8_t              prefix_length;
    uint16_t             reserved16;

    uint16_t             referenced_ls_type;
    uint16_t             entry_count = 0;

    uint8_t              flags;


    ls_type = tvb_get_ntohs(tvb, offset + 2) & 0x1FFF;
    ls_length = tvb_get_ntohs(tvb, offset + 18);
    end_offset = offset + ls_length;

    ospf_lsa_tree = proto_tree_add_subtree_format(tree, tvb, offset,
                        disassemble_body?ls_length:OSPF_LSA_HEADER_LENGTH,
                        ett_ospf_lsa, &type_item, "LSA-type %d (%s), len %d",
                        ls_type, val_to_str_const(ls_type, v3_ls_type_vals, "Unknown"),
                        ls_length);
    proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_age, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_do_not_age, tvb, offset, 2, ENC_BIG_ENDIAN);

    ti = proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_ls_type, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
    lsa_type_tree = proto_item_add_subtree(ti, ett_ospf_lsa_type);
    proto_tree_add_item(lsa_type_tree, hf_ospf_v3_ls_type_u, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(lsa_type_tree, hf_ospf_v3_ls_type_s12, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(lsa_type_tree, hf_ospf_v3_ls_type_fc, tvb, offset + 2, 2, ENC_BIG_ENDIAN);

    if (ospf_v3_ls_type_to_filter(ls_type) != -1) {
        hidden_item = proto_tree_add_item(ospf_lsa_tree,
                                          *hf_ospf_v3_ls_type_array[ospf_v3_ls_type_to_filter(ls_type)], tvb,
                                          offset + 2, 2, ENC_BIG_ENDIAN);
        proto_item_set_hidden(hidden_item);
    }

    proto_tree_add_item(ospf_lsa_tree, hf_ospf_link_state_id, tvb, offset + 4, 4, ENC_BIG_ENDIAN);

    proto_tree_add_item(ospf_lsa_tree, hf_ospf_adv_router,
                        tvb, offset + 8, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_seqnum, tvb,
                        offset + 12, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_chksum, tvb,
                        offset + 16, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(ospf_lsa_tree, hf_ospf_ls_length, tvb,
                        offset + 18, 2, ENC_BIG_ENDIAN);

    /* skip past the LSA header to the body */
    offset += OSPF_LSA_HEADER_LENGTH;
    ls_length -= OSPF_LSA_HEADER_LENGTH;

    if (!disassemble_body)
        return offset;

    switch (ls_type)
    {
    case OSPF_V3_LSTYPE_ROUTER:
        /* flags field in an router-lsa */
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset, hf_ospf_v3_router_lsa_flag, ett_ospf_v3_router_lsa_flags, bf_v3_router_lsa_flags, ENC_BIG_ENDIAN);

        /* options field in an router-lsa */
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset + 1, hf_ospf_v3_options, ett_ospf_v3_options, bf_v3_options, ENC_BIG_ENDIAN);

        /* skip the router-lsa flags and options */
        offset+=4;
        ls_length-=4;

        if (ls_length > 0)
            router_tree = proto_tree_add_subtree(ospf_lsa_tree, tvb, offset, ls_length,
                                ett_ospf_v3_router_interface, NULL, "Router Interfaces");

        /* scan all router-lsa router interfaces */
        while (ls_length > 0 ) {
            entry_count++;
            router_entry_tree = proto_tree_add_subtree_format(router_tree, tvb, offset, 16,
                ett_ospf_v3_router_interface_entry, NULL, "Entry #%d", entry_count);

            proto_tree_add_item(router_entry_tree, hf_ospf_v3_lsa_type, tvb, offset, 1, ENC_BIG_ENDIAN);

            /* reserved field */
            reserved = tvb_get_uint8(tvb, offset+1);
            ti = proto_tree_add_item(router_entry_tree, hf_ospf_header_reserved, tvb, offset+1, 1, ENC_NA);
            if (reserved != 0)
                expert_add_info(pinfo, ti, &ei_ospf_header_reserved);

            /* metric */
            proto_tree_add_item(router_entry_tree, hf_ospf_metric, tvb, offset + 2, 2, ENC_BIG_ENDIAN);

            /* Interface ID */
            proto_tree_add_item(router_entry_tree, hf_ospf_v3_lsa_interface_id, tvb, offset + 4, 4, ENC_BIG_ENDIAN);

            /* Neighbor Interface ID */
            proto_tree_add_item(router_entry_tree, hf_ospf_v3_lsa_neighbor_interface_id, tvb, offset + 8, 4, ENC_BIG_ENDIAN);

            /* Neighbor Router ID */
            proto_tree_add_item(router_entry_tree, hf_ospf_v3_lsa_neighbor_router_id, tvb, offset + 12, 4, ENC_BIG_ENDIAN);

            /* skip to the (possible) next entry */
            offset+=16;
            ls_length-=16;

        }
        break;

    case OSPF_V3_LSTYPE_NETWORK:
        dissect_ospf_v3_network_lsa_common(tvb, pinfo, ospf_lsa_tree, &offset, &ls_length);

        while (ls_length > 0 ) {
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_attached_router, tvb, offset, 4, ENC_BIG_ENDIAN);
            ls_length-=4;
            offset += 4;
        }
        break;

    case OSPF_V3_LSTYPE_INTER_AREA_PREFIX:
        /* reserved field */
        reserved = tvb_get_uint8(tvb, offset);
        ti = proto_tree_add_item(ospf_lsa_tree, hf_ospf_header_reserved, tvb, offset, 1, ENC_NA);
        if (reserved != 0)
            expert_add_info(pinfo, ti, &ei_ospf_header_reserved);

        /* metric */
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_metric, tvb, offset + 1, 3, ENC_BIG_ENDIAN);

        /* prefix length */
        prefix_length=tvb_get_uint8(tvb, offset+4);
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_prefix_length, tvb, offset+4, 1, ENC_BIG_ENDIAN);

        /* prefix options */
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset + 5, hf_ospf_v3_prefix_option, ett_ospf_v3_prefix_options, bf_v3_prefix_options, ENC_BIG_ENDIAN);

        /* 16 bits reserved */
        reserved16=tvb_get_ntohs(tvb, offset+6);
        ti = proto_tree_add_item(ospf_lsa_tree, hf_ospf_header_reserved, tvb, offset+6, 2, ENC_NA);
        if (reserved16 != 0)
            expert_add_info(pinfo, ti, &ei_ospf_header_reserved);

        offset+=8;

        /* address_prefix */
        dissect_ospf_v3_address_prefix(tvb, pinfo, offset, prefix_length, ospf_lsa_tree, address_family);

        offset+=(prefix_length+31)/32*4;
        break;

    case OSPF_V3_LSTYPE_INTER_AREA_ROUTER:
        /* reserved field */
        reserved = tvb_get_uint8(tvb, offset);
        ti = proto_tree_add_item(ospf_lsa_tree, hf_ospf_header_reserved, tvb, offset, 1, ENC_NA);
        if (reserved != 0)
            expert_add_info(pinfo, ti, &ei_ospf_header_reserved);

        /* options field in an inter-area-router-lsa */
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset + 1, hf_ospf_v3_options, ett_ospf_v3_options, bf_v3_options, ENC_BIG_ENDIAN);

        /* reserved field */
        reserved = tvb_get_uint8(tvb, offset+4);
        ti = proto_tree_add_item(ospf_lsa_tree, hf_ospf_header_reserved, tvb, offset+4, 1, ENC_NA);
        if (reserved != 0)
            expert_add_info(pinfo, ti, &ei_ospf_header_reserved);

        /* metric */
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_metric, tvb, offset + 5, 3, ENC_BIG_ENDIAN);

        /* Destination Router ID */
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_destination_router_id, tvb, offset + 8, 4, ENC_BIG_ENDIAN);

        offset+=12;
        break;

    case OSPF_V3_LSTYPE_NSSA:
    case OSPF_V3_LSTYPE_AS_EXTERNAL:
        /* flags */
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset, hf_ospf_v3_as_external_flag, ett_ospf_v3_as_external_flags, bf_v3_as_external_flags, ENC_BIG_ENDIAN);
        flags=tvb_get_uint8(tvb, offset);

        /* 24 bits metric */
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_metric, tvb, offset+1, 3, ENC_BIG_ENDIAN);

        /* prefix length */
        prefix_length=tvb_get_uint8(tvb, offset+4);
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_prefix_length, tvb, offset+4, 1, ENC_BIG_ENDIAN);

        /* prefix options */
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset + 5, hf_ospf_v3_prefix_option, ett_ospf_v3_prefix_options, bf_v3_prefix_options, ENC_BIG_ENDIAN);

        /* referenced LS type */
        referenced_ls_type=tvb_get_ntohs(tvb, offset+6);
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_referenced_ls_type, tvb, offset+6, 2, ENC_BIG_ENDIAN);

        offset+=8;

        /* address_prefix */
        dissect_ospf_v3_address_prefix(tvb, pinfo, offset, prefix_length, ospf_lsa_tree, address_family);

        offset+=(prefix_length+31)/32*4;

        /* Forwarding Address (optional - only if F-flag is on) */
        if ( (offset < end_offset) && (flags & OSPF_V3_AS_EXTERNAL_FLAG_F) ) {
            if (address_family == OSPF_AF_6) {
                proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_forwarding_address_ipv6, tvb, offset, 16, ENC_NA);
            } else {
                proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_forwarding_address_ipv4, tvb, offset, 4, ENC_BIG_ENDIAN);
            }

            offset+=16;
        }

        /* External Route Tag (optional - only if T-flag is on) */
        if ( (offset < end_offset) && (flags & OSPF_V3_AS_EXTERNAL_FLAG_T) ) {
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_external_route_tag, tvb, offset, 4, ENC_BIG_ENDIAN);
            offset+=4;
        }

        /* Referenced Link State ID (optional - only if Referenced LS type is non-zero */
        if ( (offset < end_offset) && (referenced_ls_type != 0) ) {
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_referenced_link_state_id, tvb, offset, 4, ENC_BIG_ENDIAN);
            offset+=4;
        }
        break;

    case OSPF_V3_LSTYPE_LINK:
        /* router priority */
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_router_priority, tvb, offset, 1, ENC_BIG_ENDIAN);

        /* options field in an link-lsa */
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset + 1, hf_ospf_v3_options, ett_ospf_v3_options, bf_v3_options, ENC_BIG_ENDIAN);

        /* Link-local Interface Address */
        if (address_family == OSPF_AF_6) {
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_link_local_interface_address, tvb, offset + 4, 16, ENC_NA);
        } else {
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_link_local_interface_address_ipv4, tvb, offset + 4, 4, ENC_BIG_ENDIAN);
        }
        /* Number prefixes */
        proto_tree_add_item_ret_uint(ospf_lsa_tree, hf_ospf_v3_lsa_num_prefixes, tvb, offset+20, 4, ENC_BIG_ENDIAN, &number_prefixes);

        offset+=24;

        while (number_prefixes > 0) {

            /* prefix length */
            prefix_length=tvb_get_uint8(tvb, offset);
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_prefix_length, tvb, offset, 1, ENC_BIG_ENDIAN);

            /* prefix options */
            proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset + 1, hf_ospf_v3_prefix_option, ett_ospf_v3_prefix_options, bf_v3_prefix_options, ENC_BIG_ENDIAN);

            /* 16 bits reserved */
            reserved16=tvb_get_ntohs(tvb, offset+2);
            ti = proto_tree_add_item(ospf_lsa_tree, hf_ospf_header_reserved, tvb, offset+2, 2, ENC_NA);
            if (reserved16 != 0)
                expert_add_info(pinfo, ti, &ei_ospf_header_reserved);

            offset+=4;

            /* address_prefix */
            dissect_ospf_v3_address_prefix(tvb, pinfo, offset, prefix_length, ospf_lsa_tree, address_family);

            offset+=(prefix_length+31)/32*4;

            number_prefixes--;

        }
        break;

    case OSPF_V3_LSTYPE_INTRA_AREA_PREFIX:
        /* # prefixes */
        proto_tree_add_item_ret_uint(ospf_lsa_tree, hf_ospf_v3_lsa_num_prefixes, tvb, offset, 2, ENC_BIG_ENDIAN, &number_prefixes);

        /* referenced LS type */
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_referenced_ls_type, tvb, offset+2, 2, ENC_BIG_ENDIAN);

        /* Referenced Link State ID */
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_referenced_link_state_id, tvb, offset + 4, 4, ENC_BIG_ENDIAN);

        /* Referenced Advertising Router */
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_referenced_advertising_router, tvb, offset + 8, 4, ENC_BIG_ENDIAN);

        offset+=12;

        while (number_prefixes > 0) {

            /* prefix length */
            prefix_length=tvb_get_uint8(tvb, offset);
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_prefix_length, tvb, offset, 1, ENC_BIG_ENDIAN);

            /* prefix options */
            proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset + 1, hf_ospf_v3_prefix_option, ett_ospf_v3_prefix_options, bf_v3_prefix_options, ENC_BIG_ENDIAN);

            /* 16 bits metric */
            proto_tree_add_item(ospf_lsa_tree, hf_ospf_metric, tvb, offset+2, 2, ENC_BIG_ENDIAN);

            offset+=4;

            /* address_prefix */
            dissect_ospf_v3_address_prefix(tvb, pinfo, offset, prefix_length, ospf_lsa_tree, address_family);

            offset+=(prefix_length+31)/32*4;

            number_prefixes--;
        }
        break;

    case OSPF_V3_LSTYPE_OPAQUE_RI:
        dissect_ospf_lsa_opaque_ri(tvb, pinfo, offset, ospf_lsa_tree, ls_length);
        offset += ls_length;
        break;

    case OSPF_V3_LSTYPE_E_INTRA_AREA_PREFIX:
        /* prefixes, 0 as per RFC  */
        proto_tree_add_item_ret_uint(ospf_lsa_tree, hf_ospf_v3_lsa_num_prefixes, tvb, offset, 2, ENC_BIG_ENDIAN, &number_prefixes);

        /* referenced LS type */
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_referenced_ls_type, tvb, offset+2, 2, ENC_BIG_ENDIAN);

        /* Referenced Link State ID */
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_referenced_link_state_id, tvb, offset + 4, 4, ENC_BIG_ENDIAN);

        /* Referenced Advertising Router */
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_referenced_advertising_router, tvb, offset + 8, 4, ENC_BIG_ENDIAN);

        offset+=12;
        ls_length-=12;

        dissect_ospf6_e_lsa_tlv(tvb, pinfo, offset, ospf_lsa_tree, ls_length, address_family);
        offset += ls_length;
        break;

    case OSPF_V3_LSTYPE_E_ROUTER:
        /* flags field in an router-lsa */
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset, hf_ospf_v3_router_lsa_flag, ett_ospf_v3_router_lsa_flags, bf_v3_router_lsa_flags, ENC_BIG_ENDIAN);

        /* options field in an router-lsa */
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset + 1, hf_ospf_v3_options, ett_ospf_v3_options, bf_v3_options, ENC_BIG_ENDIAN);

        /* skip the router-lsa flags and options */
        offset+=4;
        ls_length-=4;
        dissect_ospf6_e_lsa_tlv(tvb, pinfo, offset, ospf_lsa_tree, ls_length, address_family);
        offset += ls_length;
        break;

    case OSPF_V3_LSTYPE_E_NETWORK:
        /* reserved field & options */
        dissect_ospf_v3_network_lsa_common(tvb, pinfo, ospf_lsa_tree, &offset, &ls_length);

        /* Attached-Routers TLV */
        dissect_ospf6_e_lsa_tlv(tvb, pinfo, offset, ospf_lsa_tree, ls_length, address_family);
        offset += ls_length;
        break;

    case OSPF_V3_LSTYPE_E_AS_EXTERNAL:
        /* External-Prefix TLV */
        dissect_ospf6_e_lsa_tlv(tvb, pinfo, offset, ospf_lsa_tree, ls_length, address_family);
        offset += ls_length;
        break;

    case OSPF_V3_LSTYPE_E_LINK:
        /* router priority */
        proto_tree_add_item(ospf_lsa_tree, hf_ospf_v3_lsa_router_priority, tvb, offset, 1, ENC_BIG_ENDIAN);

        /* options field in an link-lsa */
        proto_tree_add_bitmask(ospf_lsa_tree, tvb, offset + 1, hf_ospf_v3_options, ett_ospf_v3_options, bf_v3_options, ENC_BIG_ENDIAN);

        offset+=4;
        ls_length-=4;

        dissect_ospf6_e_lsa_tlv(tvb, pinfo, offset, ospf_lsa_tree, ls_length, address_family);
        offset += ls_length;
        break;

    case OSPF_V3_LSTYPE_GRACE:
        /* Grace-TLV */
        dissect_ospf_lsa_grace_tlv(tvb, pinfo, offset, ospf_lsa_tree, ls_length, OSPF_VERSION_3);
        offset += ls_length;
        break;

    default:
        /* unknown LSA type */
        expert_add_info_format(pinfo, type_item, &ei_ospf_lsa_unknown_type,
                            "Unknown LSA Type %u",ls_type);
        offset += ls_length;
        break;
    }
    /* return the offset of the next LSA */
    return offset;
}

static void dissect_ospf_v3_address_prefix(tvbuff_t *tvb, packet_info *pinfo, int offset, int prefix_length, proto_tree *tree,
                                           uint8_t address_family)
{

    int bytes_to_process;
    ws_in6_addr prefix;

    bytes_to_process=((prefix_length+31)/32)*4;

    if (prefix_length > 128) {
        proto_tree_add_expert_format(tree, pinfo, &ei_ospf_lsa_bad_length, tvb, offset, bytes_to_process,
            "Address Prefix: length is invalid (%d, should be <= 128)",
            prefix_length);
        return;
    }

    memset(prefix.bytes, 0, sizeof prefix.bytes);
    if (bytes_to_process != 0) {
        tvb_memcpy(tvb, prefix.bytes, offset, bytes_to_process);
        if (prefix_length % 8) {
            prefix.bytes[bytes_to_process - 1] &=
                ((0xff00 >> (prefix_length % 8)) & 0xff);
        }
    }
    if (address_family == OSPF_AF_6) {
        proto_tree_add_ipv6(tree, hf_ospf_v3_address_prefix_ipv6, tvb, offset, bytes_to_process,
                            &prefix);
    } else {
        proto_tree_add_item(tree, hf_ospf_v3_address_prefix_ipv4, tvb, offset, 4, ENC_BIG_ENDIAN);
    }

}


void
proto_register_ospf(void)
{
    static hf_register_info ospff_info[] = {

        {&hf_ospf_header,
         { "OSPF Header", "ospf.header", FT_NONE, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_version,
         { "Version", "ospf.version", FT_UINT8, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},
        /* Message type number */
        {&hf_ospf_header_msg_type,
         { "Message Type", "ospf.msg", FT_UINT8, BASE_DEC, VALS(pt_vals), 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_packet_length,
         { "Packet Length", "ospf.packet_length", FT_UINT16, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_src_router,
         { "Source OSPF Router", "ospf.srcrouter", FT_IPv4, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_area_id,
         { "Area ID", "ospf.area_id", FT_IPv4, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_checksum,
         { "Checksum", "ospf.checksum", FT_UINT16, BASE_HEX, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_tlv_type,
         { "TLV Type", "ospf.tlv_type", FT_UINT16, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_tlv_length,
         { "TLV Length", "ospf.tlv_length", FT_UINT16, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_instance_id,
         { "Instance ID", "ospf.instance_id", FT_UINT8, BASE_RANGE_STRING | BASE_DEC, RVALS(ospf_instance_id_rvals), 0x0,
           NULL, HFILL }},
        /* OSPF Header v2 (Auth) */
        {&hf_ospf_header_auth_type,
         { "Auth Type", "ospf.auth.type", FT_UINT8, BASE_DEC, VALS(auth_vals), 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_auth_data_none,
         { "Auth Data (none)", "ospf.auth.none", FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_auth_data_simple,
         { "Auth Data (Simple)", "ospf.auth.simple", FT_STRING, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_auth_crypt_key_id,
         { "Auth Crypt Key id", "ospf.auth.crypt.key_id", FT_UINT8, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_auth_crypt_data_length,
         { "Auth Crypt Data Length", "ospf.auth.crypt.data_length", FT_UINT8, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_auth_crypt_seq_nbr,
         { "Auth Crypt Sequence Number", "ospf.auth.crypt.seq_nbr", FT_UINT32, BASE_HEX, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_auth_crypt_data,
         { "Auth Crypt Data", "ospf.auth.crypt.data", FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_header_auth_data_unknown,
         { "Auth Unknown", "ospf.auth.unknown", FT_BYTES, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        /* OSPF Header v3 */
        {&hf_ospf_v3_header_instance_id,
         { "Instance ID", "ospf.v3.instance_id", FT_UINT8, BASE_RANGE_STRING | BASE_DEC, RVALS(ospfv3_instance_id_rvals), 0x0,
           NULL, HFILL }},

        {&hf_ospf_header_reserved,
         { "Reserved", "ospf.reserved", FT_BYTES, BASE_NONE, NULL, 0x0,
           "Must be zero", HFILL }},

        /* Message types */
        {&hf_ospf_msg_hello,
         { "Hello", "ospf.msg.hello", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_msg_db_desc,
         { "Database Description", "ospf.msg.dbdesc", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_msg_ls_req,
         { "Link State Adv Request", "ospf.msg.lsreq", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_msg_ls_upd,
         { "Link State Adv Update", "ospf.msg.lsupdate", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_msg_ls_ack,
         { "Link State Adv Acknowledgement", "ospf.msg.lsack", FT_BOOLEAN,
           BASE_NONE, NULL, 0x0, NULL, HFILL }},

        /* Hello Packet */
        {&hf_ospf_hello,
         { "OSPF Hello Packet", "ospf.hello", FT_NONE,
           BASE_NONE, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_hello_network_mask,
         { "Network Mask", "ospf.hello.network_mask", FT_IPv4,
           BASE_NETMASK, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_hello_interface_id,
         { "Interface ID", "ospf.hello.interface_id", FT_UINT32,
           BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_hello_hello_interval,
         { "Hello Interval [sec]", "ospf.hello.hello_interval", FT_UINT32,
           BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_hello_router_priority,
         { "Router Priority", "ospf.hello.router_priority", FT_UINT8,
           BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_hello_router_dead_interval,
         { "Router Dead Interval [sec]", "ospf.hello.router_dead_interval", FT_UINT32,
           BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_hello_designated_router,
         { "Designated Router", "ospf.hello.designated_router", FT_IPv4,
           BASE_NONE, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_hello_backup_designated_router,
         { "Backup Designated Router", "ospf.hello.backup_designated_router", FT_IPv4,
           BASE_NONE, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_hello_active_neighbor,
         { "Active Neighbor", "ospf.hello.active_neighbor", FT_IPv4,
           BASE_NONE, NULL, 0x0, NULL, HFILL }},


        /* Authentication trailer */
        {&hf_ospf_at,
         { "OSPF Authentication Trailer", "ospf.at", FT_NONE,
           BASE_NONE, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_at_auth_type,
         { "Authentication Type", "ospf.at.auth_type", FT_UINT16,
           BASE_DEC, VALS(ospf_at_authentication_type_vals), 0x0, "Identifying the type of authentication", HFILL }},
        {&hf_ospf_at_auth_data_len,
         { "Authentication Data Length", "ospf.at.auth_data_len", FT_UINT16,
           BASE_DEC, NULL, 0x0, "The length in octets of the Authentication Trailer (AT) including both the 16-octet fixed header and the variable length message digest", HFILL }},
        {&hf_ospf_at_reserved,
         { "Reserved", "ospf.at.reserved", FT_UINT16,
           BASE_HEX, NULL, 0x0, "It SHOULD be set to 0", HFILL }},
        {&hf_ospf_at_sa_id,
         { "Security Association Identifier (SA ID)", "ospf.at.sa_id", FT_UINT16,
           BASE_HEX, NULL, 0x0, "That maps to the authentication algorithm and the secret key used to create the message digest", HFILL }},
        {&hf_ospf_at_crypto_seq_nbr,
         { "Cryptographic Sequence Number", "ospf.at.crypto_seq_nbr", FT_UINT64,
           BASE_DEC, NULL, 0x0, "Increasing sequence number that is used to guard against replay attacks", HFILL }},
        {&hf_ospf_at_auth_data,
         { "Authentication Data", "ospf.at.auth_data", FT_BYTES,
           BASE_NONE, NULL, 0x0, "Variable data that is carrying the digest for the protocol packet and optional LLS data block", HFILL }},

        /* LS Types */
        {&hf_ospf_ls_type,
         { "LS Type", "ospf.lsa", FT_UINT32, BASE_DEC,
           VALS(ls_type_vals), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_age,
         {"LS Age (seconds)", "ospf.lsa.age", FT_UINT16,
            BASE_DEC, NULL, ~OSPF_DNA_LSA, NULL, HFILL }},
        {&hf_ospf_ls_donotage,
         {"Do Not Age Flag", "ospf.lsa.donotage", FT_UINT16,
            BASE_DEC, NULL, OSPF_DNA_LSA, NULL, HFILL }},
        {&hf_ospf_ls_id,
         {"Link State ID", "ospf.lsa.id", FT_IPv4,
            BASE_NONE, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_seqnum,
         {"Sequence Number", "ospf.lsa.seqnum", FT_UINT32,
            BASE_HEX, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_chksum,
         {"Checksum", "ospf.lsa.chksum", FT_UINT16,
            BASE_HEX, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_length,
         {"Length", "ospf.lsa.length", FT_UINT16,
            BASE_DEC, NULL, 0x0, NULL, HFILL }},

        {&hf_ospf_ls_opaque_type,
         { "Link State ID Opaque Type", "ospf.lsid_opaque_type", FT_UINT8, BASE_DEC,
           VALS(ls_opaque_type_vals), 0x0, NULL, HFILL }},

        {&hf_ospf_ls_mpls_te_instance,
         { "Link State ID TE-LSA Instance", "ospf.lsid_te_lsa.instance", FT_UINT16, BASE_DEC,
           NULL, 0x0, NULL, HFILL }},

        {&hf_ospf_ls_router,
         { "Router LSA", "ospf.lsa.router", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_router_linktype,
         { "Link Type", "ospf.lsa.router.linktype", FT_UINT8, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_router_linkid,
         { "Link ID", "ospf.lsa.router.linkid", FT_IPv4, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_router_linkdata,
         { "Link Data", "ospf.lsa.router.linkdata", FT_IPv4, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_router_nummetrics,
         { "Number of Metrics", "ospf.lsa.router.nummetrics", FT_UINT8, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_router_metric0,
         { "0 Metric", "ospf.lsa.router.metric0", FT_UINT16, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},

        {&hf_ospf_ls_network,
         { "Network LSA", "ospf.lsa.network", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_network_netmask,
         { "Netmask", "ospf.lsa.network.netmask", FT_IPv4, BASE_NETMASK, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_network_attachrtr,
         { "Attached Router", "ospf.lsa.network.attchrtr", FT_IPv4, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        {&hf_ospf_ls_summary,
         { "Summary LSA (IP Network)", "ospf.lsa.summary", FT_BOOLEAN, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_asbr,
         { "Summary LSA (ASBR)", "ospf.lsa.asbr", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_asbr_netmask,
         { "Netmask", "ospf.lsa.asbr.netmask", FT_IPv4, BASE_NETMASK, NULL, 0x0,
           NULL, HFILL }},

        {&hf_ospf_ls_asext,
         { "AS-External LSA (ASBR)", "ospf.lsa.asext", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_asext_netmask,
         { "Netmask", "ospf.lsa.asext.netmask", FT_IPv4, BASE_NETMASK, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_asext_fwdaddr,
         { "Forwarding Address", "ospf.lsa.asext.fwdaddr", FT_IPv4, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_asext_extrtrtag,
         { "External Route Tag", "ospf.lsa.asext.extrttag", FT_UINT32, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},

        {&hf_ospf_ls_grpmember,
         { "Group Membership LSA", "ospf.lsa.member", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_asext7,
         { "NSSA AS-External LSA", "ospf.lsa.nssa", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_extattr,
         { "External Attributes LSA", "ospf.lsa.attr", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_opaque,
         { "Opaque LSA", "ospf.lsa.opaque", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        /* OSPFv3 E-LSA TLV */
        {&hf_ospf_v3_e_lsa_tlv_type,
         { "TLV Type", "ospf.v3.elsa.tlv_type", FT_UINT16, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_v3_e_lsa_tlv_length,
         { "TLV Length", "ospf.v3.elsa.tlv_length", FT_UINT16, BASE_DEC, NULL, 0x0,
           NULL, HFILL }},

        /* OSPFv3 LS Types */
        {&hf_ospf_v3_ls_type,
         { "LS Type", "ospf.v3.lsa", FT_UINT16, BASE_HEX, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_v3_ls_type_u,
         { "LSA Handling", "ospf.v3.lsa.u", FT_BOOLEAN, 16, TFS(&tfs_v3_ls_type_u), 0x8000,
           NULL, HFILL }},
        {&hf_ospf_v3_ls_type_s12,
         { "Flooding Scope", "ospf.v3.lsa.s12", FT_UINT16, BASE_HEX, VALS(v3_ls_type_s12_vals), 0x6000,
           NULL, HFILL }},
        {&hf_ospf_v3_ls_type_fc,
         { "Function Code", "ospf.v3.lsa.fc", FT_UINT16, BASE_DEC, VALS(v3_ls_type_vals), 0x1FFF,
           NULL, HFILL }},

        {&hf_ospf_v3_ls_router,
         { "Router-LSA", "ospf.v3.lsa.router", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_v3_ls_network,
         { "Network-LSA", "ospf.v3.lsa.network", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_v3_ls_inter_area_prefix,
         { "Inter-Area-Prefix-LSA", "ospf.v3.lsa.interprefix", FT_BOOLEAN, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_ls_inter_area_router,
         { "Inter-Area-Router-LSA", "ospf.v3.lsa.interrouter", FT_BOOLEAN, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_ls_as_external,
         { "AS-External-LSA", "ospf.v3.lsa.asext", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_v3_ls_group_membership,
         { "Group-Membership-LSA", "ospf.v3.lsa.member", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_v3_ls_nssa,
         { "NSSA-LSA", "ospf.v3.lsa.nssa", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_v3_ls_link,
         { "Link-LSA", "ospf.v3.lsa.link", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_v3_ls_intra_area_prefix,
         { "Intra-Area-Prefix-LSA", "ospf.v3.lsa.intraprefix", FT_BOOLEAN, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_elsa_intra_area_prefix,
         { "E-Intra-Area-Prefix-LSA", "ospf.v3.elsa.intraprefix", FT_BOOLEAN, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_ls_opaque_ri,
         { "Router Information Opaque-LSA", "ospf.v3.lsa.opaque", FT_BOOLEAN, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},

        /* Other interesting OSPF values */

        {&hf_ospf_adv_router,
         { "Advertising Router", "ospf.advrouter", FT_IPv4, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        {&hf_ospf_ls_mpls,
         { "MPLS Traffic Engineering LSA", "ospf.lsa.mpls", FT_BOOLEAN,
           BASE_NONE, NULL, 0x0, NULL, HFILL }},

        {&hf_ospf_ls_mpls_routerid,
         { "MPLS/TE Router ID", "ospf.mpls.routerid", FT_IPv4, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},

        {&hf_ospf_ls_mpls_linktype,
         { "MPLS/TE Link Type", "ospf.mpls.linktype", FT_UINT8, BASE_DEC,
           VALS(mpls_link_stlv_ltype_str), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_mpls_linkid,
         { "MPLS/TE Link ID", "ospf.mpls.linkid", FT_IPv4, BASE_NONE, NULL, 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_mpls_local_addr,
         { "MPLS/TE Local Interface Address", "ospf.mpls.local_addr", FT_IPv4,
           BASE_NONE, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_mpls_remote_addr,
         { "MPLS/TE Remote Interface Address", "ospf.mpls.remote_addr", FT_IPv4,
           BASE_NONE, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_mpls_te_metric,
         { "MPLS/TE Metric", "ospf.mpls.te_metric", FT_UINT32,
           BASE_DEC, NULL, 0x0, NULL, HFILL }},

        {&hf_ospf_ls_mpls_local_ifid,
         { "MPLS/TE Local Interface Index", "ospf.mpls.local_id", FT_UINT32,
           BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_mpls_remote_ifid,
         { "MPLS/TE Remote Interface Index", "ospf.mpls.remote_id", FT_UINT32,
           BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_mpls_linkcolor,
         { "MPLS/TE Link Resource Class/Color", "ospf.mpls.linkcolor", FT_UINT32,
           BASE_HEX, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_mpls_group,
         { "MPLS/TE Group", "ospf.mpls.group", FT_UINT32,
           BASE_HEX, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_mpls_link_max_bw,
         { "Link Max BW", "ospf.mpls.link_max_bw", FT_FLOAT,
           BASE_NONE, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_mpls_bc_model_id,
         { "MPLS/DSTE Bandwidth Constraints Model Id", "ospf.mpls.bc.model_id", FT_UINT8,
           BASE_RANGE_STRING | BASE_DEC, RVALS(mpls_link_stlv_bcmodel_rvals), 0x0,
           NULL, HFILL }},

        {&hf_ospf_ls_oif_local_node_id,
         { "Local Node ID", "ospf.oif.local_node_id", FT_IPv4,
           BASE_NONE, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_oif_remote_node_id,
         { "Remote Node ID", "ospf.oif.remote_node_id", FT_IPv4,
           BASE_NONE, NULL, 0x0, NULL, HFILL }},

        {&hf_ospf_v2_options,
         { "Options", "ospf.v2.options", FT_UINT8, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v2_options_mt,
         { "(MT) Multi-Topology Routing", "ospf.v2.options.mt", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_V2_OPTIONS_MT, NULL, HFILL }},
        {&hf_ospf_v2_options_e,
         { "(E) External Routing", "ospf.v2.options.e", FT_BOOLEAN, 8,
           TFS(&tfs_capable_not_capable), OSPF_V2_OPTIONS_E, NULL, HFILL }},
        {&hf_ospf_v2_options_mc,
         { "(MC) Multicast", "ospf.v2.options.mc", FT_BOOLEAN, 8,
           TFS(&tfs_capable_not_capable), OSPF_V2_OPTIONS_MC, NULL, HFILL }},
        {&hf_ospf_v2_options_n,
         { "(N) NSSA", "ospf.v2.options.n", FT_BOOLEAN, 8,
           TFS(&tfs_supported_not_supported), OSPF_V2_OPTIONS_NP, NULL, HFILL }},
        {&hf_ospf_v2_options_p,
         { "(P) Propagate", "ospf.v2.options.p", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_V2_OPTIONS_NP, NULL, HFILL }},
        {&hf_ospf_v2_options_l,
         { "(L) LLS Data block", "ospf.v2.options.l", FT_BOOLEAN, 8,
           TFS(&tfs_present_not_present), OSPF_V2_OPTIONS_L, NULL, HFILL }},
        {&hf_ospf_v2_options_dc,
         { "(DC) Demand Circuits", "ospf.v2.options.dc", FT_BOOLEAN, 8,
           TFS(&tfs_supported_not_supported), OSPF_V2_OPTIONS_DC, NULL, HFILL }},
        {&hf_ospf_v2_options_o,
         { "(O) Opaque", "ospf.v2.options.o", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_V2_OPTIONS_O, NULL, HFILL }},
        {&hf_ospf_v2_options_dn,
         { "DN", "ospf.v2.options.dn", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_V2_OPTIONS_DN, NULL, HFILL }},

        {&hf_ospf_ri_options,
         { "RI Options", "ospf.ri.options", FT_UINT8, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ri_options_grc,
         { "(GRC) Graceful Restart", "ospf.ri.options.grc", FT_BOOLEAN, 8,
           TFS(&tfs_capable_not_capable), OSPF_RI_OPTIONS_GRC, NULL, HFILL }},
        {&hf_ospf_ri_options_grh,
         { "(GRH) Graceful Restart Helper", "ospf.ri.options.grh", FT_BOOLEAN, 8,
           TFS(&tfs_enabled_disabled), OSPF_RI_OPTIONS_GRH, NULL, HFILL }},
        {&hf_ospf_ri_options_srs,
         { "Stub Router Support", "ospf.ri.options.srs", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_RI_OPTIONS_SRS, NULL, HFILL }},
        {&hf_ospf_ri_options_tes,
         { "(TES) Traffic Engineering", "ospf.ri.options.tes", FT_BOOLEAN, 8,
           TFS(&tfs_supported_not_supported), OSPF_RI_OPTIONS_TES, NULL, HFILL }},
        {&hf_ospf_ri_options_p2plan,
         { "(P2PLAN) Point-to-point over LAN", "ospf.ri.options.p2plan", FT_BOOLEAN, 8,
           TFS(&tfs_capable_not_capable), OSPF_RI_OPTIONS_P2PLAN, NULL, HFILL }},
        {&hf_ospf_ri_options_ete,
         { "(ETE) Experimental TE", "ospf.ri.options.ete", FT_BOOLEAN, 8,
           TFS(&tfs_capable_not_capable), OSPF_RI_OPTIONS_ETE, NULL, HFILL }},
        {&hf_ospf_ri_options_host,
         { "Host Router", "ospf.ri.options.host", FT_BOOLEAN, 8,
           TFS(&tfs_capable_not_capable), OSPF_RI_OPTIONS_HOST, NULL, HFILL }},

        {&hf_ospf_tlv_type_opaque,
         { "TLV Type", "ospf.tlv_type.opaque", FT_UINT16, BASE_DEC, VALS(ri_tlv_type_vals), 0x0,
           NULL, HFILL }},

        {&hf_ospf_v3_options,
         { "Options", "ospf.v3.options", FT_UINT24, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_options_v6,
         { "V6", "ospf.v3.options.v6", FT_BOOLEAN, 24,
           TFS(&tfs_set_notset), OSPF_V3_OPTIONS_V6, NULL, HFILL }},
        {&hf_ospf_v3_options_e,
         { "E", "ospf.v3.options.e", FT_BOOLEAN, 24,
           TFS(&tfs_set_notset), OSPF_V3_OPTIONS_E, NULL, HFILL }},
        {&hf_ospf_v3_options_mc,
         { "MC", "ospf.v3.options.mc", FT_BOOLEAN, 24,
           TFS(&tfs_set_notset), OSPF_V3_OPTIONS_MC, NULL, HFILL }},
        {&hf_ospf_v3_options_n,
         { "N", "ospf.v3.options.n", FT_BOOLEAN, 24,
           TFS(&tfs_set_notset), OSPF_V3_OPTIONS_N, NULL, HFILL }},
        {&hf_ospf_v3_options_r,
         { "R", "ospf.v3.options.r", FT_BOOLEAN, 24,
           TFS(&tfs_set_notset), OSPF_V3_OPTIONS_R, NULL, HFILL }},
        {&hf_ospf_v3_options_dc,
         { "DC", "ospf.v3.options.dc", FT_BOOLEAN, 24,
           TFS(&tfs_set_notset), OSPF_V3_OPTIONS_DC, NULL, HFILL }},
        {&hf_ospf_v3_options_af,
         { "AF", "ospf.v3.options.af", FT_BOOLEAN, 24,
           TFS(&tfs_set_notset), OSPF_V3_OPTIONS_AF, NULL, HFILL }},
        {&hf_ospf_v3_options_l,
         { "L", "ospf.v3.options.l", FT_BOOLEAN, 24,
           TFS(&tfs_set_notset), OSPF_V3_OPTIONS_L, NULL, HFILL }},
        {&hf_ospf_v3_options_at,
         { "AT", "ospf.v3.options.at", FT_BOOLEAN, 24,
           TFS(&tfs_set_notset), OSPF_V3_OPTIONS_AT, NULL, HFILL }},
        {&hf_ospf_dbd,
         { "DB Description", "ospf.dbd", FT_UINT8, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_dbd_r,
         { "(R) OOBResync", "ospf.dbd.r", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_DBD_FLAG_R, NULL, HFILL }},
        {&hf_ospf_dbd_i,
         { "(I) Init", "ospf.dbd.i", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_DBD_FLAG_I, NULL, HFILL }},
        {&hf_ospf_dbd_m,
         { "(M) More", "ospf.dbd.m", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_DBD_FLAG_M, NULL, HFILL }},
        {&hf_ospf_dbd_ms,
         { "(MS) Master", "ospf.dbd.ms", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_DBD_FLAG_MS, NULL, HFILL }},
        {&hf_ospf_lls_ext_options,
         { "Options", "ospf.lls.ext.options", FT_UINT32, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_lls_ext_options_lr,
         { "(LR) LSDB Resynchronization", "ospf.lls.ext.options.lr", FT_BOOLEAN, 32,
           TFS(&tfs_set_notset), OSPF_LLS_EXT_OPTIONS_LR, NULL, HFILL }},
        {&hf_ospf_lls_ext_options_rs,
         { "(RS) Restart Signal", "ospf.lls.ext.options.rs", FT_BOOLEAN, 32,
           TFS(&tfs_set_notset), OSPF_LLS_EXT_OPTIONS_RS, NULL, HFILL }},
        {&hf_ospf_v2_router_lsa_flag,
         { "Flags", "ospf.v2.router.lsa.flags", FT_UINT8, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v2_router_lsa_flag_b,
         { "(B) Area border router", "ospf.v2.router.lsa.flags.b", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_V2_ROUTER_LSA_FLAG_B, NULL, HFILL }},
        {&hf_ospf_v2_router_lsa_flag_e,
         { "(E) AS boundary router", "ospf.v2.router.lsa.flags.e", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_V2_ROUTER_LSA_FLAG_E, NULL, HFILL }},
        {&hf_ospf_v2_router_lsa_flag_v,
         { "(V) Virtual link endpoint", "ospf.v2.router.lsa.flags.v", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_V2_ROUTER_LSA_FLAG_V, NULL, HFILL }},
        {&hf_ospf_v2_router_lsa_flag_w,
         { "(W) Wild-card multicast receiver", "ospf.v2.router.lsa.flags.w", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_V2_ROUTER_LSA_FLAG_W, NULL, HFILL }},
        {&hf_ospf_v2_router_lsa_flag_n,
         { "(N) NSSA translation", "ospf.v2.router.lsa.flags.n", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_V2_ROUTER_LSA_FLAG_N, NULL, HFILL }},
        {&hf_ospf_v2_router_lsa_flag_s,
         { "(S) Shortcut-capable ABR", "ospf.v2.router.lsa.flags.s", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_V2_ROUTER_LSA_FLAG_S, NULL, HFILL }},
        {&hf_ospf_v2_router_lsa_flag_h,
         { "(H) Host", "ospf.v2.router.lsa.flags.h", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_V2_ROUTER_LSA_FLAG_H, NULL, HFILL }},
        {&hf_ospf_v3_router_lsa_flag,
         { "Flags", "ospf.v3.router.lsa.flags", FT_UINT8, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_router_lsa_flag_b,
         { "(B) Area border router", "ospf.v3.router.lsa.flags.b", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_V3_ROUTER_LSA_FLAG_B, NULL, HFILL }},
        {&hf_ospf_v3_router_lsa_flag_e,
         { "(E) AS boundary router", "ospf.v3.router.lsa.flags.e", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_V3_ROUTER_LSA_FLAG_E, NULL, HFILL }},
        {&hf_ospf_v3_router_lsa_flag_v,
         { "(V) Virtual link endpoint", "ospf.v3.router.lsa.flags.v", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_V3_ROUTER_LSA_FLAG_V, NULL, HFILL }},
        {&hf_ospf_v3_router_lsa_flag_w,
         { "(W) Wild-card multicast receiver", "ospf.v3.router.lsa.flags.w", FT_BOOLEAN, 8,
           TFS(&tfs_yes_no), OSPF_V3_ROUTER_LSA_FLAG_W, NULL, HFILL }},
        {&hf_ospf_v3_as_external_flag,
         { "Flags", "ospf.v3.as.external.flags", FT_UINT8, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_as_external_flag_t,
         { "(T) External Route Tag", "ospf.v3.as.external.flags.t", FT_BOOLEAN, 8,
           TFS(&tfs_present_not_present), OSPF_V3_AS_EXTERNAL_FLAG_T, NULL, HFILL }},
        {&hf_ospf_v3_as_external_flag_f,
         { "(F) Forwarding Address", "ospf.v3.as.external.flags.f", FT_BOOLEAN, 8,
           TFS(&tfs_present_absent), OSPF_V3_AS_EXTERNAL_FLAG_F, NULL, HFILL }},
        {&hf_ospf_v3_as_external_flag_e,
         { "(E) External Metric", "ospf.v3.as.external.flags.e", FT_BOOLEAN, 8,
           TFS(&tfs_v3_as_external_flags_e), OSPF_V3_AS_EXTERNAL_FLAG_E, NULL, HFILL }},
        {&hf_ospf_v3_prefix_option,
         { "PrefixOptions", "ospf.v3.prefix.options", FT_UINT8, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_prefix_option_nu,
         { "(NU) NoUnicast", "ospf.v3.prefix.options.nu", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_V3_PREFIX_OPTION_NU, NULL, HFILL }},
        {&hf_ospf_v3_prefix_option_la,
         { "(LA) Local Address", "ospf.v3.prefix.options.la", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_V3_PREFIX_OPTION_LA, NULL, HFILL }},
        {&hf_ospf_v3_prefix_option_mc,
         { "(MC) Multicast", "ospf.v3.prefix.options.mc", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_V3_PREFIX_OPTION_MC, NULL, HFILL }},
        {&hf_ospf_v3_prefix_option_p,
         { "(P) Propagate", "ospf.v3.prefix.options.p", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_V3_PREFIX_OPTION_P, NULL, HFILL }},

        /* Dynamic Hostname contained in the Opaque RI LSA - dynamic hostname TLV*/
        {&hf_ospf_dyn_hostname,
         { "Dynamic Hostname", "ospf.dynhostname", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},

        {&hf_ospf_lsa_sa,
         { "SR-Algorithm", "ospf.lsa_sa", FT_UINT8, BASE_DEC, VALS(ri_lsa_sa_tlv_type_vals), 0x0, NULL, HFILL }},

        {&hf_ospf_ls_slr_stlv,
         { "TLV Type", "ospf.tlv.sidlabel_range.type", FT_UINT16, BASE_DEC, VALS(ext_pfx_stlv_type_vals), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_range_size,
         { "Range Size", "ospf.tlv.range_size", FT_UINT24, BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_sid_label,
         { "SID/Label", "ospf.tlv.sid_label", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_preference,
         { "Preference", "ospf.tlv.preference", FT_UINT24, BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_igp_msd_type,
         { "MSD Type", "ospf.tlv.igp_msd_type", FT_UINT8, BASE_DEC, VALS(ospf_igp_msd_types), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_igp_msd_value,
         { "MSD Value", "ospf.tlv.igp_msd_value", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_remote_ipv4_addr,
         { "Remote IPv4 Address", "ospf.tlv.remote_ipv4_address", FT_IPv4, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_local_interface_id,
         { "Local Interface ID", "ospf.tlv.local_interface_id", FT_UINT32, BASE_DEC,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_remote_interface_id,
         { "Remote Interface ID", "ospf.tlv.remote_interface_id", FT_UINT32, BASE_DEC,
           NULL, 0x0, NULL, HFILL }},

        /* Flex Algo Definition TLV (rfc9350) */
        {&hf_ospf_ls_flex_algorithm,
         { "Flex-Algorithm", "ospf.tlv.flex_algorithm", FT_UINT8, BASE_DEC,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_fad_metric_type,
         { "Metric-Type", "ospf.tlv.fad.metric_type", FT_UINT8, BASE_DEC,
           VALS(ri_lsa_fad_metric_type_vals), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_fad_calc_type,
         { "Calc-Type", "ospf.tlv.fad.calc_type", FT_UINT8, BASE_DEC,
           VALS(ri_lsa_sa_tlv_type_vals), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_fad_priority,
         { "Priority", "ospf.tlv.fad.priority", FT_UINT8, BASE_DEC,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_fad_stlv,
         { "TLV Type", "ospf.tlv.fad.subtlv_type", FT_UINT16, BASE_DEC, VALS(ri_lsa_fad_stlv_type_vals), 0x0,
           NULL, HFILL }},
        {&hf_ospf_ls_fad_def_flags,
         { "Flags", "ospf.tlv.fad.definition_flags", FT_UINT32, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_fad_def_flags_m,
         { "M-flag (M)", "ospf.tlv.fad.definition_flags.m", FT_BOOLEAN, 32,
           TFS(&tfs_set_notset), FAD_DEF_FLAGS_M, NULL, HFILL }},
        {&hf_ospf_ls_fapm_flags,
         { "Flags", "ospf.tlv.fapm.flags", FT_UINT8, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_fapm_flags_e,
         { "E bit", "ospf.tlv.fapm.flags.e", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), FAPM_FLAGS_E, NULL, HFILL }},
        {&hf_ospf_ls_fapm_metric,
         { "Metric", "ospf.tlv.fapm.metric", FT_UINT32, BASE_DEC,
           NULL, 0, NULL, HFILL }},

        /* the Unknown TLV of the Opaque RI LSA */
        {&hf_ospf_unknown_tlv,
         { "Unknown TLV", "ospf.tlv.unknown", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},

        /* OSPF Extended Prefix TLV */
        {&hf_ospf_ls_epfx_tlv,
         { "TLV Type", "ospf.tlv.extpfx.tlv_type", FT_UINT16, BASE_DEC, VALS(ext_pfx_tlv_type_vals), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_epfx_stlv,
         { "TLV Type", "ospf.tlv.extpfx.subtlv_type", FT_UINT16, BASE_DEC, VALS(ext_pfx_stlv_type_vals), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_epfx_route_type,
         { "Route Type", "ospf.tlv.extpfx.routetype", FT_UINT8, BASE_DEC, VALS(ext_pfx_tlv_route_vals), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_epfx_af,
         { "Address Family", "ospf.tlv.extpfx.af", FT_UINT8, BASE_DEC, VALS(ext_pfx_tlv_af_vals), 0x0, NULL, HFILL }},

        {&hf_ospf_ls_epfx_flags,
         { "Flags", "ospf.tlv.extpfx.flags", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_epfx_flag_a,
         { "(A) Attach Flag", "ospf.tlv.extpfx.flags.a", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), EXT_PREFIX_TLV_FLAG_A, NULL, HFILL }},
        {&hf_ospf_ls_epfx_flag_n,
         { "(N) Node Flag", "ospf.tlv.extpfx.flags.n", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), EXT_PREFIX_TLV_FLAG_N, NULL, HFILL }},
        {&hf_ospf_ls_epfx_flag_unknown,
         { "(*) Unknown Flag", "ospf.tlv.extpfx.flags.unknown", FT_UINT8, BASE_HEX,
           NULL, EXT_PREFIX_TLV_FLAG_UNKNOWN, NULL, HFILL }},

        {&hf_ospf_ls_epfx_range_flags,
         { "Flags", "ospf.tlv.extpfx_range.flags", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_epfx_range_flag_ia,
         { "(IA) Inter-Area Flag", "ospf.tlv.extpfx_range.flags.ia", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), EXT_PREFIX_RANGE_TLV_FLAG_IA, NULL, HFILL }},
        {&hf_ospf_ls_epfx_range_flag_unknown,
         { "(*) Unknown Flag", "ospf.tlv.extpfx_range.flags.unknown", FT_UINT8, BASE_HEX,
           NULL, EXT_PREFIX_RANGE_TLV_FLAG_UNKNOWN, NULL, HFILL }},

        {&hf_ospf_ls_pfxsid_flags,
         { "Flags", "ospf.tlv.pfxsid.flags", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_pfxsid_flag_np,
         { "(NP) No-PHP Flag", "ospf.tlv.pfxsid.flags.np", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), SR_STLV_PFXSID_FLAG_NP, NULL, HFILL }},
        {&hf_ospf_ls_pfxsid_flag_m,
         { "(M) Mapping Server Flag", "ospf.tlv.pfxsid.flags.m", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), SR_STLV_PFXSID_FLAG_M, NULL, HFILL }},
        {&hf_ospf_ls_pfxsid_flag_e,
         { "(E) Explicit-Null Flag", "ospf.tlv.pfxsid.flags.e", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), SR_STLV_PFXSID_FLAG_E, NULL, HFILL }},
        {&hf_ospf_ls_pfxsid_flag_v,
         { "(V) Value/Index Flag", "ospf.tlv.pfxsid.flags.v", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), SR_STLV_PFXSID_FLAG_V, NULL, HFILL }},
        {&hf_ospf_ls_pfxsid_flag_l,
         { "(L) Local/Global Flag", "ospf.tlv.pfxsid.flags.l", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), SR_STLV_PFXSID_FLAG_L, NULL, HFILL }},
        {&hf_ospf_ls_pfxsid_flag_unknown,
         { "(*) Unknown Flag", "ospf.tlv.pfxsid.flags.unknown", FT_UINT8, BASE_HEX,
           NULL, SR_STLV_PFXSID_FLAG_UNKNOWN, NULL, HFILL }},

        /* OSPF Extended Link TLV */
        {&hf_ospf_ls_elink_tlv,
         { "TLV Type", "ospf.tlv.extlink.tlv_type", FT_UINT16, BASE_DEC, VALS(ext_link_tlv_type_vals), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_elink_stlv,
         { "TLV Type", "ospf.tlv.extlink.subtlv_type", FT_UINT16, BASE_DEC, VALS(ext_link_stlv_type_vals), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_elink_mt_id,
         { "Multi-Topology ID", "ospf.tlv.extlink.mt_id", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_elink_weight,
         { "Weight", "ospf.tlv.extlink.weight", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_elink_nbr,
         { "Neighbor ID", "ospf.tlv.extlink.nbr", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},

        {&hf_ospf_ls_adjsid_flags,
         { "Flags", "ospf.tlv.adjsid.flags", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_adjsid_flag_b,
         { "(B) Backup Flag", "ospf.tlv.adjsid.flags.b", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), SR_STLV_ADJSID_FLAG_B, NULL, HFILL }},
        {&hf_ospf_ls_adjsid_flag_v,
         { "(V) Value/Index Flag", "ospf.tlv.adjsid.flags.v", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), SR_STLV_ADJSID_FLAG_V, NULL, HFILL }},
        {&hf_ospf_ls_adjsid_flag_l,
         { "(L) Local/Global Flag", "ospf.tlv.adjsid.flags.l", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), SR_STLV_ADJSID_FLAG_L, NULL, HFILL }},
        {&hf_ospf_ls_adjsid_flag_g,
         { "(G) Group Flag", "ospf.tlv.adjsid.flags.g", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), SR_STLV_ADJSID_FLAG_G, NULL, HFILL }},
        {&hf_ospf_ls_adjsid_flag_p,
         { "(P) Persistent Flag", "ospf.tlv.adjsid.flags.p", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), SR_STLV_ADJSID_FLAG_P, NULL, HFILL }},
        {&hf_ospf_ls_adjsid_flag_unknown,
         { "(*) Unknown Flag", "ospf.tlv.adjsid.flags.unknown", FT_UINT8, BASE_HEX,
           NULL, SR_STLV_ADJSID_FLAG_UNKNOWN, NULL, HFILL }},
        /* Application-Specific Link Attributes Sub-TLV (rfc9492) */
        {&hf_ospf_ls_app_sabm_length,
         { "SABM Length", "ospf.tlv.application.sabm.length",
           FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_app_udabm_length,
         { "UDABM Length", "ospf.tlv.application.udabm.length",
           FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_app_sabm_bits,
         { "Standard Application Identifier Bit Mask", "ospf.tlv.application.sabm.bits",
           FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_app_sabm_bits_r,
         { "(R) RSVP-TE", "ospf.tlv.application.sabm.bits.r",
           FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x80, NULL, HFILL }},
        {&hf_ospf_ls_app_sabm_bits_s,
         { "(S) Segment Routing Policy", "ospf.tlv.application.sabm.bits.s",
           FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x40, NULL, HFILL }},
        {&hf_ospf_ls_app_sabm_bits_f,
         { "(F) Loop-Free Alternate (LFA)", "ospf.tlv.application.sabm.bits.f",
           FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x20, NULL, HFILL }},
        {&hf_ospf_ls_app_sabm_bits_x,
         { "(X) Flexible Algorithm", "ospf.tlv.application.sabm.bits.x",
           FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x10, NULL, HFILL }},
        {&hf_ospf_ls_app_udabm_bits,
         { "User-Defined Application Identifier Bit Mask", "ospf.tlv.application.udabm.bits",
           FT_BYTES, SEP_SPACE, NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_app_link_attrs_stlv,
         { "TLV Type", "ospf.tlv.application.subtlv_type",
           FT_UINT16, BASE_DEC, VALS(ext_link_stlv_type_vals), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_srlg,
         { "Shared Risk Link Group", "ospf.tlv.srlg",
           FT_UINT32, BASE_DEC_HEX, NULL, 0x0, NULL, HFILL }},
        /* OSPF Traffic Engineering (TE) Metric Extensions (rfc7471) */
        {&hf_ospf_ls_unidir_link_flags,
         { "Flags", "ospf.tlv.unidirectional_link_flags",
           FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }
        },
        {&hf_ospf_ls_unidir_link_flags_a,
         { "(A) Anomalous", "ospf.tlv.unidirectional_link_flags.a",
           FT_BOOLEAN, 8, TFS(&tfs_set_notset), 0x80, NULL, HFILL }
        },
        {&hf_ospf_ls_unidir_link_flags_reserved,
         { "Reserved", "ospf.tlv.unidirectional_link_flags.reserved",
           FT_UINT8, BASE_HEX, NULL, 0x7f, NULL, HFILL }
        },
        {&hf_ospf_ls_unidir_link_reserved,
         { "Reserved", "ospf.tlv.unidirectional_link_reserved",
           FT_UINT8, BASE_HEX, NULL, 0,NULL, HFILL }
        },
        {&hf_ospf_ls_unidir_link_delay,
         { "Delay", "ospf.tlv.unidirectional_link_delay",
           FT_UINT24, BASE_DEC, NULL, 0,NULL, HFILL }
        },
        {&hf_ospf_ls_unidir_link_delay_min,
         { "Min Delay", "ospf.tlv.unidirectional_link_delay_min",
           FT_UINT24, BASE_DEC, NULL, 0, NULL, HFILL }
        },
        {&hf_ospf_ls_unidir_link_delay_max,
         { "Max Delay", "ospf.tlv.unidirectional_link_delay_max",
           FT_UINT24, BASE_DEC, NULL, 0, NULL, HFILL }
        },
        {&hf_ospf_ls_unidir_delay_variation,
         { "Delay Variation", "ospf.tlv.unidirectional_delay_variation",
           FT_UINT24, BASE_DEC, NULL, 0, NULL, HFILL }
        },
        /* Administrative Group (rfc3630) */
        {&hf_ospf_ls_admin_group,
         { "Admin Group", "ospf.tlv.admin_group", FT_UINT32, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        /* Extended Administrative Group (rfc7308) */
        {&hf_ospf_ls_ext_admin_group,
         { "Extended Admin Group", "ospf.tlv.extended_admin_group", FT_UINT32, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},

        /* OSPF Extended Inter-Area ASBR TLV */
        {&hf_ospf_ls_eia_asbr_tlv,
         { "TLV Type", "ospf.tlv.extasbr.tlv_type", FT_UINT16, BASE_DEC,
           VALS(ext_ia_asbr_tlv_type_vals), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_eia_asbr_stlv,
         { "TLV Type", "ospf.tlv.extasbr.subtlv_type", FT_UINT16, BASE_DEC,
           VALS(ext_ia_asbr_stlv_type_vals), 0x0, NULL, HFILL }},
        {&hf_ospf_ls_eia_asbr_asbr_routerid,
         { "ASBR Router ID", "ospf.tlv.extasbr.asbr_routerid", FT_IPv4, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_faam_reserved,
         { "Reserved", "ospf.tlv.faam.reserved", FT_UINT24, BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_ls_faam_metric,
         { "Metric", "ospf.tlv.faam.metric", FT_UINT32, BASE_DEC,
           NULL, 0, NULL, HFILL }},

        /* OSPF Restart TLVs  */
        {&hf_ospf_grace_tlv,
         { "Grace TLV", "ospf.grace", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL}},
        {&hf_ospf_grace_period,
         { "Grace Period", "ospf.grace.period", FT_UINT32, BASE_DEC|BASE_UNIT_STRING,
           UNS(&units_seconds), 0x0,
           "The number of seconds neighbors should advertise the router as fully adjacent",
           HFILL }},
        {&hf_ospf_grace_reason,
         { "Restart Reason", "ospf.grace.reason", FT_UINT8, BASE_DEC,
           VALS(restart_reason_vals), 0x0, "The reason the router is restarting", HFILL }},
        {&hf_ospf_grace_ip,
         { "Restart IP", "ospf.grace.ip", FT_IPv4, BASE_NONE,
           NULL, 0x0, "The IP address of the interface originating this LSA", HFILL }},

        /* OSPFv3 LLS TLVs */
        {&hf_ospf_v3_lls_ext_options_tlv,
         { "Extended Options TLV", "ospf.v3.lls.ext.options.tlv", FT_NONE, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_lls_ext_options,
         { "Options", "ospf.v3.lls.ext.options", FT_UINT32,  BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_lls_ext_options_lr,
         { "(LR) LSDB Resynchronization", "ospf.v3.lls.ext.options.lr", FT_BOOLEAN, 32,
           TFS(&tfs_set_notset), OSPF_V3_LLS_EXT_OPTIONS_LR, NULL, HFILL }},
        {&hf_ospf_v3_lls_ext_options_rs,
         { "(RS) Restart Signal", "ospf.v3.lls.ext.options.rs", FT_BOOLEAN, 32,
           TFS(&tfs_set_notset), OSPF_V3_LLS_EXT_OPTIONS_RS, NULL, HFILL }},
        {&hf_ospf_v3_lls_state_tlv,
         { "State Check Sequence TLV", "ospf.v3.lls.state.tlv", FT_NONE, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_lls_state_scs,
         { "SCS Number", "ospf.v3.lls.state.scs", FT_UINT16,  BASE_DEC,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_lls_state_options,
         { "Options", "ospf.v3.lls.state.options", FT_UINT8,  BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_lls_state_options_r,
         { "(R) Request", "ospf.v3.lls.state.options.r", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_V3_LLS_STATE_OPTIONS_R, NULL, HFILL }},
        {&hf_ospf_v3_lls_state_options_a,
         { "(A) Answer", "ospf.v3.lls.state.options.a", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_V3_LLS_STATE_OPTIONS_A , NULL, HFILL }},
        {&hf_ospf_v3_lls_state_options_n,
         { "(N) Incomplete", "ospf.v3.lls.state.options.n", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_V3_LLS_STATE_OPTIONS_N ,NULL, HFILL }},
        {&hf_ospf_v3_lls_drop_tlv,
         { "Neighbor Drop TLV", "ospf.v3.lls.drop.tlv", FT_NONE, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_lls_relay_tlv,
         { "Active Overlapping Relays TLV", "ospf.v3.lls.relay.tlv", FT_NONE, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_lls_relay_added,
         { "Relays Added", "ospf.v3.lls.relay.added", FT_UINT8,  BASE_DEC,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_lls_relay_options,
         { "Options", "ospf.v3.lls.relay.options", FT_UINT8,  BASE_HEX,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_lls_relay_options_a,
         { "(A) Always", "ospf.v3.lls.relay.options.a", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_V3_LLS_RELAY_OPTIONS_A, NULL, HFILL }},
        {&hf_ospf_v3_lls_relay_options_n,
         { "(N) Never", "ospf.v3.lls.relay.options.n", FT_BOOLEAN, 8,
           TFS(&tfs_set_notset), OSPF_V3_LLS_RELAY_OPTIONS_N, NULL, HFILL }},
        {&hf_ospf_v3_lls_willingness_tlv,
         { "Willingness TLV", "ospf.v3.lls.willingness.tlv", FT_NONE, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_lls_willingness,
         { "Willingness", "ospf.v3.lls.willingness", FT_UINT8,  BASE_DEC,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_lls_rf_tlv,
         { "Request From TLV", "ospf.v3.lls.rf.tlv", FT_NONE, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v3_lls_fsf_tlv,
         { "Full State For TLV", "ospf.v3.lls.fsf.tlv", FT_NONE, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
        {&hf_ospf_v2_lls_li_id,
         { "Local Interface ID", "ospf.v3.lls.ll_id", FT_BYTES, BASE_NONE,
           NULL, 0x0, NULL, HFILL }},
      /* Generated from convert_proto_tree_add_text.pl */
      { &hf_ospf_v2_lls_sequence_number, { "Sequence number", "ospf.v2.lls.sequence_number", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v2_lls_auth_data, { "Auth Data", "ospf.v2.lls.auth_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lls_dropped_neighbor, { "Dropped Neighbor", "ospf.v3.lls.dropped_neighbor", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lls_neighbor, { "Neighbor", "ospf.v3.lls.neighbor", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lls_request_from, { "Request From", "ospf.v3.lls.request_from", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lls_full_state_for, { "Full State For", "ospf.v3.lls.full_state_for", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_lls_checksum, { "Checksum", "ospf.lls.checksum", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_lls_data_length, { "LLS Data Length", "ospf.lls.data_length", FT_UINT16, BASE_DEC|BASE_UNIT_STRING, UNS(&units_byte_bytes), 0x0, NULL, HFILL }},
      { &hf_ospf_db_interface_mtu, { "Interface MTU", "ospf.db.interface_mtu", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_db_dd_sequence, { "DD Sequence", "ospf.db.dd_sequence", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_link_state_id, { "Link State ID", "ospf.link_state_id", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_ls_number_of_lsas, { "Number of LSAs", "ospf.ls.number_of_lsas", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_mpls_action, { "Action", "ospf.mpls.action", FT_UINT8, BASE_DEC, NULL, 0xF0, NULL, HFILL }},
      { &hf_ospf_mpls_bandwidth_type, { "Bandwidth Type", "ospf.mpls.bandwidth.type", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_mpls_cs, { "Channel Spacing", "ospf.mpls.cs", FT_UINT8, BASE_DEC, NULL, 0xF0, NULL, HFILL }},
      { &hf_ospf_mpls_switching_type, { "Switching Type", "ospf.mpls.switching_type", FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(gmpls_switching_type_rvals), 0x0, NULL, HFILL }},
      { &hf_ospf_mpls_encoding, { "Encoding", "ospf.mpls.encoding", FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(gmpls_lsp_enc_rvals), 0x0, NULL, HFILL }},
      { &hf_ospf_mpls_num_labels, { "Num Labels", "ospf.mpls.num.labels", FT_UINT16, BASE_DEC, NULL, 0x0FFF, NULL, HFILL }},
      { &hf_ospf_mpls_interface_mtu, { "Interface MTU", "ospf.mpls.interface_mtu", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_mpls_length, { "Length", "ospf.mpls.length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_mpls_pri, { "Priority", "ospf.mpls.priority", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_mpls_protection_capability, { "Protection Capability", "ospf.mpls.protection_capability", FT_UINT8, BASE_HEX, VALS(gmpls_protection_cap_str), 0x0, NULL, HFILL }},
      { &hf_ospf_mpls_shared_risk_link_group, { "Shared Risk Link Group", "ospf.mpls.shared_risk_link_group", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_mpls_starting, { "Starting n", "ospf.mpls.starting", FT_UINT32, BASE_DEC, NULL, 0x0FFFF000, NULL, HFILL }},
      { &hf_ospf_mpls_no_effective_bits, { "No. of effective. Bits", "ospf.mpls.effective", FT_UINT16, BASE_DEC, NULL, 0x0FFF, NULL, HFILL }},
      { &hf_ospf_mpls_bitmap, { "Bitmap", "ospf.mpls.bitmap", FT_UINT32, BASE_HEX, NULL, 0xFFFFFFFF, NULL, HFILL }},
      { &hf_ospf_mpls_grid, { "Grid", "ospf.mpls.grid", FT_UINT8, BASE_DEC, NULL, 0xE0, NULL, HFILL }},
      { &hf_ospf_mpls_cs2, { "Channel Spacing", "ospf.mpls.cs", FT_UINT8, BASE_DEC, NULL, 0x1E, NULL, HFILL }},
      { &hf_ospf_mpls_n, { "Starting n", "ospf.mpls.n", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_mpls_type, { "Type", "ospf.mpls.type", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_oif_switching_cap, { "Switching Cap", "ospf.oif.switching_cap", FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(gmpls_switching_type_rvals), 0x0, NULL, HFILL }},
      { &hf_ospf_oif_encoding, { "Encoding", "ospf.oif.encoding", FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(gmpls_lsp_enc_rvals), 0x0, NULL, HFILL }},
      { &hf_ospf_oif_tna_addr_length, { "Addr Length", "ospf.oif.tna_addr_length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_oif_tna_addr_ipv4, { "TNA Addr", "ospf.oif.tna_addr.ipv4", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_tna_addr_ipv6, { "TNA Addr", "ospf.oif.tna_addr.ipv6", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_tna_addr, { "TNA Addr", "ospf.oif.tna_addr", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_ls_id_te_lsa_reserved, { "Link State ID TE-LSA Reserved", "ospf.lsid_te_lsa.reserved", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_ls_id_opaque_id, { "Link State ID Opaque ID", "ospf.lsid.opaque_id", FT_UINT24, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_lsa_number_of_links, { "Number of Links", "ospf.lsa.number_of_links", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_do_not_age, { "Do Not Age", "ospf.v3.lsa.do_not_age", FT_BOOLEAN, 16, NULL, OSPF_DNA_LSA, NULL, HFILL }},
      { &hf_ospf_v3_lsa_interface_id, { "Interface ID", "ospf.v3.lsa.interface_id", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_neighbor_interface_id, { "Neighbor Interface ID", "ospf.v3.lsa.neighbor_interface_id", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_neighbor_router_id, { "Neighbor Router ID", "ospf.v3.lsa.neighbor_router_id", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_attached_router, { "Attached Router", "ospf.v3.lsa.attached_router", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_destination_router_id, { "Destination Router ID", "ospf.v3.lsa.destination_router_id", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_referenced_ls_type, { "Referenced LS type", "ospf.v3.lsa.referenced_ls_type", FT_UINT16, BASE_HEX, VALS(v3_ls_type_vals), 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_forwarding_address_ipv6, { "Forwarding Address", "ospf.v3.lsa.forwarding_address.ipv6", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_external_route_tag, { "External Route Tag", "ospf.v3.lsa.external_route_tag", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_referenced_link_state_id, { "Referenced Link State ID", "ospf.v3.lsa.referenced_link_state_id", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_router_priority, { "Router Priority", "ospf.v3.lsa.router_priority", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_link_local_interface_address, { "Link-local Interface Address", "ospf.v3.lsa.link_local_interface_address.ipv6", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_referenced_advertising_router, { "Referenced Advertising Router", "ospf.v3.lsa.referenced_advertising_router", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_lsa_external_type, { "External Type", "ospf.lsa.asext.type", FT_BOOLEAN, 8, TFS(&tfs_lsa_external_type), 0x80, NULL, HFILL }},
      { &hf_ospf_lsa_tos, { "TOS", "ospf.lsa.tos", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_lsa_external_tos, { "TOS", "ospf.lsa.tos", FT_UINT8, BASE_DEC, NULL, 0x7f, NULL, HFILL }},
      { &hf_ospf_v3_lsa_type, { "Type", "ospf.v3.lsa.type", FT_UINT8, BASE_DEC, VALS(ospf_v3_lsa_type_vals), 0, NULL, HFILL }},
      { &hf_ospf_metric, { "Metric", "ospf.metric", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL }},
      { &hf_ospf_prefix_length, { "PrefixLength", "ospf.prefix_length", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }},
      { &hf_ospf_ls_mpls_pri, { "Pri (or TE-Class)", "ospf.mpls.pri", FT_FLOAT, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_ls_mpls_bc, { "BC", "ospf.mpls.bc", FT_FLOAT, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_mpls_minimum_lsp_bandwidth, { "Minimum LSP bandwidth", "ospf.mpls.minimum_lsp_bandwidth", FT_FLOAT, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_mpls_sonet_sdh, { "SONET/SDH", "ospf.mpls.sonet.sdh", FT_BOOLEAN, BASE_NONE, TFS(&tfs_arbitrary_standard), 0x0, NULL, HFILL }},
      { &hf_ospf_oif_signal_type, { "Signal Type", "ospf.oif.signal_type", FT_UINT8, BASE_DEC|BASE_EXT_STRING, &gmpls_sonet_signal_type_str_ext, 0x0, NULL, HFILL }},
      { &hf_ospf_tlv_value, { "TLV Value", "ospf.tlv_value", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_oif_node_id, { "Node ID", "ospf.oif.node_id", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_pad_bytes, { "Pad Bytes", "ospf.pad_bytes", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_ls_metric, { "Metric", "ospf.ls.metric", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_forwarding_address_ipv4, { "Forwarding Address", "ospf.v3.lsa.forwarding_address.ipv4", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_link_local_interface_address_ipv4, { "Link-local Interface Address", "ospf.v3.lsa.link_local_interface_address.ipv4", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_lsa_num_prefixes, { "# prefixes", "ospf.v3.lsa.num_prefixes", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_address_prefix_ipv6, { "Address Prefix", "ospf.v3.address_prefix.ipv6", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }},
      { &hf_ospf_v3_address_prefix_ipv4, { "Address Prefix", "ospf.v3.address_prefix.ipv4", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
    };

    static int *ett[] = {
        &ett_ospf,
        &ett_ospf_at,
        &ett_ospf_hdr,
        &ett_ospf_hello,
        &ett_ospf_desc,
        &ett_ospf_lsr,
        &ett_ospf_lsa,
        &ett_ospf_lsa_router_link,
        &ett_ospf_lsa_upd,
        &ett_ospf_lsa_mpls,
        &ett_ospf_lsa_mpls_bandwidth_sstlv,
        &ett_ospf_lsa_mpls_base_label,
        &ett_ospf_lsa_mpls_router,
        &ett_ospf_lsa_mpls_link,
        &ett_ospf_lsa_mpls_link_stlv,
        &ett_ospf_lsa_mpls_link_stlv_admingrp,
        &ett_ospf_lsa_opaque_ri,
        &ett_ospf_elsa,
        &ett_ospf_elsa_pfx_tlv,
        &ett_ospf_lsa_ri_tlv,
        &ett_ospf_lsa_dh_tlv,
        &ett_ospf_lsa_sa_tlv,
        &ett_ospf_lsa_slr_tlv,
        &ett_ospf_lsa_slr_stlv,
        &ett_ospf_lsa_srms_tlv,
        &ett_ospf_lsa_node_msd_tlv,
        &ett_ospf_lsa_fad_tlv,
        &ett_ospf_lsa_fad_stlv,
        &ett_ospf_lsa_fad_def_flags,
        &ett_ospf_lsa_fapm_flags,
        &ett_ospf_lsa_unknown_tlv,
        &ett_ospf_lsa_epfx,
        &ett_ospf_lsa_elink,
        &ett_ospf_lsa_elink_tlv,
        &ett_ospf_lsa_elink_stlv,
        &ett_ospf_lsa_epfx_tlv,
        &ett_ospf_lsa_epfx_flags,
        &ett_ospf_lsa_epfx_range_flags,
        &ett_ospf_lsa_epfx_stlv,
        &ett_ospf_lsa_pfxsid_flags,
        &ett_ospf_lsa_adjsid_flags,
        &ett_ospf_lsa_app_sabm_bits,
        &ett_ospf_lsa_app_link_attrs_stlv,
        &ett_ospf_lsa_unidir_link_flags,
        &ett_ospf_lsa_eia_asbr,
        &ett_ospf_lsa_eia_asbr_tlv,
        &ett_ospf_lsa_oif_tna,
        &ett_ospf_lsa_oif_tna_stlv,
        &ett_ospf_lsa_grace_tlv,
        &ett_ospf_lsa_type,
        &ett_ospf_v2_options,
        &ett_ospf_ri_options,
        &ett_ospf_v3_options,
        &ett_ospf_dbd,
        &ett_ospf_lls_data_block,
        &ett_ospf_lls_tlv,
        &ett_ospf_lls_ext_options,
        &ett_ospf_v3_router_interface,
        &ett_ospf_v3_router_interface_entry,
        &ett_ospf_v3_lls_ext_options_tlv,
        &ett_ospf_v3_lls_ext_options,
        &ett_ospf_v3_lls_state_tlv,
        &ett_ospf_v3_lls_state_scs,
        &ett_ospf_v3_lls_state_options,
        &ett_ospf_v3_lls_drop_tlv,
        &ett_ospf_v3_lls_relay_tlv,
        &ett_ospf_v3_lls_relay_added,
        &ett_ospf_v3_lls_relay_options,
        &ett_ospf_v3_lls_willingness_tlv,
        &ett_ospf_v3_lls_willingness,
        &ett_ospf_v3_lls_rf_tlv,
        &ett_ospf_v3_lls_fsf_tlv,
        &ett_ospf_v2_router_lsa_flags,
        &ett_ospf_v3_router_lsa_flags,
        &ett_ospf_v3_as_external_flags,
        &ett_ospf_v3_prefix_options,
        &ett_ospf_mpls_pri,
        &ett_ospf_mpls_bitmap,
        &ett_ospf_lsa_eia_asbr_stlv
    };

    static ei_register_info ei[] = {
        { &ei_ospf_header_reserved, { "ospf.reserved.not_zero", PI_PROTOCOL, PI_WARN, "incorrect, should be 0", EXPFILL }},
        { &ei_ospf_lsa_bad_length, { "ospf.lsa.invalid_length", PI_MALFORMED, PI_ERROR, "Invalid length", EXPFILL }},
        { &ei_ospf_lsa_constraint_missing, { "ospf.lsa.tos_missing", PI_MALFORMED, PI_WARN, "Blocks missing", EXPFILL }},
        { &ei_ospf_lsa_bc_error, { "ospf.lsa.bc_error", PI_PROTOCOL, PI_WARN, "BC error", EXPFILL }},
        { &ei_ospf_lsa_unknown_type, { "ospf.lsa.unknown_type", PI_PROTOCOL, PI_WARN, "Unknown LSA Type", EXPFILL }},
        { &ei_ospf_unknown_link_subtype, { "ospf.unknown_link_subtype", PI_PROTOCOL, PI_WARN, "Unknown Link sub-TLV", EXPFILL }},
        { &ei_ospf_stlv_length_invalid, { "ospf.stlv.invalid_length", PI_PROTOCOL, PI_WARN, "Invalid sub-TLV length", EXPFILL }},
    };

    expert_module_t* expert_ospf;
    module_t *module_ospf;

    proto_ospf = proto_register_protocol("Open Shortest Path First",
                                         "OSPF", "ospf");
    ospf_handle = register_dissector("ospf", dissect_ospf, proto_ospf);
    ospf_cap_handle = register_capture_dissector("ospf", capture_ospf, proto_ospf);
    proto_register_field_array(proto_ospf, ospff_info, array_length(ospff_info));
    proto_register_subtree_array(ett, array_length(ett));

    expert_ospf = expert_register_protocol(proto_ospf);
    expert_register_field_array(expert_ospf, ei, array_length(ei));

    module_ospf = prefs_register_protocol(proto_ospf, NULL);
    prefs_register_bool_preference(module_ospf, "ospfv3_expect_at",
        "Expect OSPFv3 Authentication Trailer",
        "The Authentication Trailer is indicated by flags only in OSPFv3 Hello "
        "and DB Description packets. When this option is enabled, remaining "
        "bytes at the end of a packet are expected to be an Authentication Trailer.",
        &ospf_v3_expect_at);
}

void
proto_reg_handoff_ospf(void)
{
    dissector_add_uint("ip.proto", IP_PROTO_OSPFIGP, ospf_handle);
    capture_dissector_add_uint("ip.proto", IP_PROTO_OSPFIGP, ospf_cap_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:
 */

Coverage Report

Created: 2026-08-14 06:45