ospf.h - platform/external/tcpdump - Git at Google

 /* @(#) $Header: /tcpdump/master/tcpdump/ospf.h,v 1.16.2.2 2006/12/13 08:24:27 hannes Exp $ (LBL) */
 /*
  * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
  *	The Regents of the University of California.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that: (1) source code distributions
  * retain the above copyright notice and this paragraph in its entirety, (2)
  * distributions including binary code include the above copyright notice and
  * this paragraph in its entirety in the documentation or other materials
  * provided with the distribution, and (3) all advertising materials mentioning
  * features or use of this software display the following acknowledgement:
  * ``This product includes software developed by the University of California,
  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  * the University nor the names of its contributors may be used to endorse
  * or promote products derived from this software without specific prior
  * written permission.
  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
  * OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu)
  */
 #define	OSPF_TYPE_UMD           0	/* UMd's special monitoring packets */
 #define	OSPF_TYPE_HELLO         1	/* Hello */
 #define	OSPF_TYPE_DD            2	/* Database Description */
 #define	OSPF_TYPE_LS_REQ        3	/* Link State Request */
 #define	OSPF_TYPE_LS_UPDATE     4	/* Link State Update */
 #define	OSPF_TYPE_LS_ACK        5	/* Link State Ack */

 /* Options field
  *
  * +------------------------------------+
  * | * | O | DC | EA | N/P | MC | E | T |
  * +------------------------------------+
  *
  */

 #define OSPF_OPTION_T	0x01	/* T bit: TOS support	*/
 #define OSPF_OPTION_E	0x02	/* E bit: External routes advertised	*/
 #define	OSPF_OPTION_MC	0x04	/* MC bit: Multicast capable */
 #define	OSPF_OPTION_NP	0x08	/* N/P bit: NSSA capable */
 #define	OSPF_OPTION_EA	0x10	/* EA bit: External Attribute capable */
 #define	OSPF_OPTION_DC	0x20	/* DC bit: Demand circuit capable */
 #define	OSPF_OPTION_O	0x40	/* O bit: Opaque LSA capable */
 #define	OSPF_OPTION_DN	0x80	/* DN bit: Up/Down Bit capable - draft-ietf-ospf-2547-dnbit-04 */

 /* ospf_authtype	*/
 #define	OSPF_AUTH_NONE		0	/* No auth-data */
 #define	OSPF_AUTH_SIMPLE	1	/* Simple password */
 #define OSPF_AUTH_SIMPLE_LEN	8	/* max length of simple authentication */
 #define OSPF_AUTH_MD5		2	/* MD5 authentication */
 #define OSPF_AUTH_MD5_LEN	16	/* length of MD5 authentication */

 /* db_flags	*/
 #define	OSPF_DB_INIT		0x04	    /*	*/
 #define	OSPF_DB_MORE		0x02
 #define	OSPF_DB_MASTER		0x01

 /* ls_type	*/
 #define	LS_TYPE_ROUTER		1   /* router link */
 #define	LS_TYPE_NETWORK		2   /* network link */
 #define	LS_TYPE_SUM_IP		3   /* summary link */
 #define	LS_TYPE_SUM_ABR		4   /* summary area link */
 #define	LS_TYPE_ASE		5   /* ASE  */
 #define	LS_TYPE_GROUP		6   /* Group membership (multicast */
 				    /* extensions 23 July 1991) */
 #define	LS_TYPE_NSSA            7   /* rfc3101 - Not so Stubby Areas */
 #define	LS_TYPE_OPAQUE_LL       9   /* rfc2370 - Opaque Link Local */
 #define	LS_TYPE_OPAQUE_AL      10   /* rfc2370 - Opaque Link Local */
 #define	LS_TYPE_OPAQUE_DW      11   /* rfc2370 - Opaque Domain Wide */

 #define LS_OPAQUE_TYPE_TE       1   /* rfc3630 */
 #define LS_OPAQUE_TYPE_GRACE    3   /* rfc3623 */
 #define LS_OPAQUE_TYPE_RI       4   /* draft-ietf-ospf-cap-03 */

 #define LS_OPAQUE_TE_TLV_ROUTER 1   /* rfc3630 */
 #define LS_OPAQUE_TE_TLV_LINK   2   /* rfc3630 */

 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE             1 /* rfc3630 */
 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID               2 /* rfc3630 */
 #define LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP              3 /* rfc3630 */
 #define LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP             4 /* rfc3630 */
 #define LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC             5 /* rfc3630 */
 #define LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW                6 /* rfc3630 */
 #define LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW            7 /* rfc3630 */
 #define LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW              8 /* rfc3630 */
 #define LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP           9 /* rfc3630 */
 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID 11 /* draft-ietf-ccamp-ospf-gmpls-extensions */
 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE 14 /* draft-ietf-ccamp-ospf-gmpls-extensions */
 #define LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR    15 /* draft-ietf-ccamp-ospf-gmpls-extensions */
 #define LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP    16 /* draft-ietf-ccamp-ospf-gmpls-extensions */
 #define LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS       17 /* rfc4124 */

 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP        1  /* rfc3630 */
 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA         2  /* rfc3630 */

 #define LS_OPAQUE_GRACE_TLV_PERIOD       1 /* rfc3623 */
 #define LS_OPAQUE_GRACE_TLV_REASON       2 /* rfc3623 */
 #define LS_OPAQUE_GRACE_TLV_INT_ADDRESS  3 /* rfc3623 */

 #define LS_OPAQUE_GRACE_TLV_REASON_UNKNOWN     0 /* rfc3623 */
 #define LS_OPAQUE_GRACE_TLV_REASON_SW_RESTART  1 /* rfc3623 */
 #define LS_OPAQUE_GRACE_TLV_REASON_SW_UPGRADE  2 /* rfc3623 */
 #define LS_OPAQUE_GRACE_TLV_REASON_CP_SWITCH   3 /* rfc3623 */

 #define LS_OPAQUE_RI_TLV_CAP             1 /* draft-ietf-ospf-cap-03 */

 /*************************************************
  *
  * is the above a bug in the documentation?
  *
  *************************************************/


 /* rla_link.link_type	*/
 #define	RLA_TYPE_ROUTER		1   /* point-to-point to another router	*/
 #define	RLA_TYPE_TRANSIT	2   /* connection to transit network	*/
 #define	RLA_TYPE_STUB		3   /* connection to stub network	*/
 #define RLA_TYPE_VIRTUAL	4   /* virtual link			*/

 /* rla_flags	*/
 #define	RLA_FLAG_B	0x01
 #define	RLA_FLAG_E	0x02
 #define	RLA_FLAG_W1	0x04
 #define	RLA_FLAG_W2	0x08

 /* sla_tosmetric breakdown	*/
 #define	SLA_MASK_TOS		0x7f000000
 #define	SLA_MASK_METRIC		0x00ffffff
 #define SLA_SHIFT_TOS		24

 /* asla_tosmetric breakdown	*/
 #define	ASLA_FLAG_EXTERNAL	0x80000000
 #define	ASLA_MASK_TOS		0x7f000000
 #define	ASLA_SHIFT_TOS		24
 #define	ASLA_MASK_METRIC	0x00ffffff

 /* multicast vertex type */
 #define	MCLA_VERTEX_ROUTER	1
 #define	MCLA_VERTEX_NETWORK	2

 /* link state advertisement header */
 struct lsa_hdr {
     u_int16_t ls_age;
     u_int8_t ls_options;
     u_int8_t ls_type;
     union {
         struct in_addr lsa_id;
         struct { /* opaque LSAs change the LSA-ID field */
             u_int8_t opaque_type;
             u_int8_t opaque_id[3];
 	} opaque_field;
     } un_lsa_id;
     struct in_addr ls_router;
     u_int32_t ls_seq;
     u_int16_t ls_chksum;
     u_int16_t ls_length;
 };

 /* link state advertisement */
 struct lsa {
     struct lsa_hdr ls_hdr;

     /* Link state types */
     union {
 	/* Router links advertisements */
 	struct {
 	    u_int8_t rla_flags;
 	    u_int8_t rla_zero[1];
 	    u_int16_t rla_count;
 	    struct rlalink {
 		struct in_addr link_id;
 		struct in_addr link_data;
 		u_int8_t link_type;
 		u_int8_t link_toscount;
 		u_int16_t link_tos0metric;
 	    } rla_link[1];		/* may repeat	*/
 	} un_rla;

 	/* Network links advertisements */
 	struct {
 	    struct in_addr nla_mask;
 	    struct in_addr nla_router[1];	/* may repeat	*/
 	} un_nla;

 	/* Summary links advertisements */
 	struct {
 	    struct in_addr sla_mask;
 	    u_int32_t sla_tosmetric[1];	/* may repeat	*/
 	} un_sla;

 	/* AS external links advertisements */
 	struct {
 	    struct in_addr asla_mask;
 	    struct aslametric {
 		u_int32_t asla_tosmetric;
 		struct in_addr asla_forward;
 		struct in_addr asla_tag;
 	    } asla_metric[1];		/* may repeat	*/
 	} un_asla;

 	/* Multicast group membership */
 	struct mcla {
 	    u_int32_t mcla_vtype;
 	    struct in_addr mcla_vid;
 	} un_mcla[1];

         /* Opaque TE LSA */
         struct {
 	    u_int16_t type;
 	    u_int16_t length;
 	    u_int8_t data[1]; /* may repeat   */
 	} un_te_lsa_tlv;

         /* Opaque Grace LSA */
         struct {
 	    u_int16_t type;
 	    u_int16_t length;
 	    u_int8_t data[1]; /* may repeat   */
 	} un_grace_tlv;

         /* Opaque Router information LSA */
         struct {
 	    u_int16_t type;
 	    u_int16_t length;
 	    u_int8_t data[1]; /* may repeat   */
 	} un_ri_tlv;

         /* Unknown LSA */
         struct unknown {
 	    u_int8_t data[1]; /* may repeat   */
 	} un_unknown[1];

     } lsa_un;
 };


 /*
  * TOS metric struct (will be 0 or more in router links update)
  */
 struct tos_metric {
     u_int8_t tos_type;
     u_int8_t tos_zero;
     u_int16_t tos_metric;
 };

 #define	OSPF_AUTH_SIZE	8

 /*
  * the main header
  */
 struct ospfhdr {
     u_int8_t ospf_version;
     u_int8_t ospf_type;
     u_int16_t ospf_len;
     struct in_addr ospf_routerid;
     struct in_addr ospf_areaid;
     u_int16_t ospf_chksum;
     u_int16_t ospf_authtype;
     u_int8_t ospf_authdata[OSPF_AUTH_SIZE];
     union {

 	/* Hello packet */
 	struct {
 	    struct in_addr hello_mask;
 	    u_int16_t hello_helloint;
 	    u_int8_t hello_options;
 	    u_int8_t hello_priority;
 	    u_int32_t hello_deadint;
 	    struct in_addr hello_dr;
 	    struct in_addr hello_bdr;
 	    struct in_addr hello_neighbor[1]; /* may repeat	*/
 	} un_hello;

 	/* Database Description packet */
 	struct {
 	    u_int8_t db_zero[2];
 	    u_int8_t db_options;
 	    u_int8_t db_flags;
 	    u_int32_t db_seq;
 	    struct lsa_hdr db_lshdr[1]; /* may repeat	*/
 	} un_db;

 	/* Link State Request */
 	struct lsr {
 	    u_int8_t ls_type[4];
             union {
                 struct in_addr ls_stateid;
                 struct { /* opaque LSAs change the LSA-ID field */
                     u_int8_t opaque_type;
                     u_int8_t opaque_id[3];
                 } opaque_field;
             } un_ls_stateid;
 	    struct in_addr ls_router;
 	} un_lsr[1];		/* may repeat	*/

 	/* Link State Update */
 	struct {
 	    u_int32_t lsu_count;
 	    struct lsa lsu_lsa[1]; /* may repeat	*/
 	} un_lsu;

 	/* Link State Acknowledgement */
 	struct {
 	    struct lsa_hdr lsa_lshdr[1]; /* may repeat	*/
 	} un_lsa ;
     } ospf_un ;
 };

 #define	ospf_hello	ospf_un.un_hello
 #define	ospf_db		ospf_un.un_db
 #define	ospf_lsr	ospf_un.un_lsr
 #define	ospf_lsu	ospf_un.un_lsu
 #define	ospf_lsa	ospf_un.un_lsa
	/* @(#) $Header: /tcpdump/master/tcpdump/ospf.h,v 1.16.2.2 2006/12/13 08:24:27 hannes Exp $ (LBL) */
	/*
	* Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
	* The Regents of the University of California. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that: (1) source code distributions
	* retain the above copyright notice and this paragraph in its entirety, (2)
	* distributions including binary code include the above copyright notice and
	* this paragraph in its entirety in the documentation or other materials
	* provided with the distribution, and (3) all advertising materials mentioning
	* features or use of this software display the following acknowledgement:
	* ``This product includes software developed by the University of California,
	* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
	* the University nor the names of its contributors may be used to endorse
	* or promote products derived from this software without specific prior
	* written permission.
	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
	* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	*
	* OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu)
	*/
	#define OSPF_TYPE_UMD 0 /* UMd's special monitoring packets */
	#define OSPF_TYPE_HELLO 1 /* Hello */
	#define OSPF_TYPE_DD 2 /* Database Description */
	#define OSPF_TYPE_LS_REQ 3 /* Link State Request */
	#define OSPF_TYPE_LS_UPDATE 4 /* Link State Update */
	#define OSPF_TYPE_LS_ACK 5 /* Link State Ack */

	/* Options field
	*
	* +------------------------------------+
	* \| * \| O \| DC \| EA \| N/P \| MC \| E \| T \|
	* +------------------------------------+
	*
	*/

	#define OSPF_OPTION_T 0x01 /* T bit: TOS support */
	#define OSPF_OPTION_E 0x02 /* E bit: External routes advertised */
	#define OSPF_OPTION_MC 0x04 /* MC bit: Multicast capable */
	#define OSPF_OPTION_NP 0x08 /* N/P bit: NSSA capable */
	#define OSPF_OPTION_EA 0x10 /* EA bit: External Attribute capable */
	#define OSPF_OPTION_DC 0x20 /* DC bit: Demand circuit capable */
	#define OSPF_OPTION_O 0x40 /* O bit: Opaque LSA capable */
	#define OSPF_OPTION_DN 0x80 /* DN bit: Up/Down Bit capable - draft-ietf-ospf-2547-dnbit-04 */

	/* ospf_authtype */
	#define OSPF_AUTH_NONE 0 /* No auth-data */
	#define OSPF_AUTH_SIMPLE 1 /* Simple password */
	#define OSPF_AUTH_SIMPLE_LEN 8 /* max length of simple authentication */
	#define OSPF_AUTH_MD5 2 /* MD5 authentication */
	#define OSPF_AUTH_MD5_LEN 16 /* length of MD5 authentication */

	/* db_flags */
	#define OSPF_DB_INIT 0x04 /* */
	#define OSPF_DB_MORE 0x02
	#define OSPF_DB_MASTER 0x01

	/* ls_type */
	#define LS_TYPE_ROUTER 1 /* router link */
	#define LS_TYPE_NETWORK 2 /* network link */
	#define LS_TYPE_SUM_IP 3 /* summary link */
	#define LS_TYPE_SUM_ABR 4 /* summary area link */
	#define LS_TYPE_ASE 5 /* ASE */
	#define LS_TYPE_GROUP 6 /* Group membership (multicast */
	/* extensions 23 July 1991) */
	#define LS_TYPE_NSSA 7 /* rfc3101 - Not so Stubby Areas */
	#define LS_TYPE_OPAQUE_LL 9 /* rfc2370 - Opaque Link Local */
	#define LS_TYPE_OPAQUE_AL 10 /* rfc2370 - Opaque Link Local */
	#define LS_TYPE_OPAQUE_DW 11 /* rfc2370 - Opaque Domain Wide */

	#define LS_OPAQUE_TYPE_TE 1 /* rfc3630 */
	#define LS_OPAQUE_TYPE_GRACE 3 /* rfc3623 */
	#define LS_OPAQUE_TYPE_RI 4 /* draft-ietf-ospf-cap-03 */

	#define LS_OPAQUE_TE_TLV_ROUTER 1 /* rfc3630 */
	#define LS_OPAQUE_TE_TLV_LINK 2 /* rfc3630 */

	#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE 1 /* rfc3630 */
	#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID 2 /* rfc3630 */
	#define LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP 3 /* rfc3630 */
	#define LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP 4 /* rfc3630 */
	#define LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC 5 /* rfc3630 */
	#define LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW 6 /* rfc3630 */
	#define LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW 7 /* rfc3630 */
	#define LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW 8 /* rfc3630 */
	#define LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP 9 /* rfc3630 */
	#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID 11 /* draft-ietf-ccamp-ospf-gmpls-extensions */
	#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE 14 /* draft-ietf-ccamp-ospf-gmpls-extensions */
	#define LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR 15 /* draft-ietf-ccamp-ospf-gmpls-extensions */
	#define LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP 16 /* draft-ietf-ccamp-ospf-gmpls-extensions */
	#define LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS 17 /* rfc4124 */

	#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP 1 /* rfc3630 */
	#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA 2 /* rfc3630 */

	#define LS_OPAQUE_GRACE_TLV_PERIOD 1 /* rfc3623 */
	#define LS_OPAQUE_GRACE_TLV_REASON 2 /* rfc3623 */
	#define LS_OPAQUE_GRACE_TLV_INT_ADDRESS 3 /* rfc3623 */

	#define LS_OPAQUE_GRACE_TLV_REASON_UNKNOWN 0 /* rfc3623 */
	#define LS_OPAQUE_GRACE_TLV_REASON_SW_RESTART 1 /* rfc3623 */
	#define LS_OPAQUE_GRACE_TLV_REASON_SW_UPGRADE 2 /* rfc3623 */
	#define LS_OPAQUE_GRACE_TLV_REASON_CP_SWITCH 3 /* rfc3623 */

	#define LS_OPAQUE_RI_TLV_CAP 1 /* draft-ietf-ospf-cap-03 */

	/*************************************************
	*
	* is the above a bug in the documentation?
	*
	*************************************************/


	/* rla_link.link_type */
	#define RLA_TYPE_ROUTER 1 /* point-to-point to another router */
	#define RLA_TYPE_TRANSIT 2 /* connection to transit network */
	#define RLA_TYPE_STUB 3 /* connection to stub network */
	#define RLA_TYPE_VIRTUAL 4 /* virtual link */

	/* rla_flags */
	#define RLA_FLAG_B 0x01
	#define RLA_FLAG_E 0x02
	#define RLA_FLAG_W1 0x04
	#define RLA_FLAG_W2 0x08

	/* sla_tosmetric breakdown */
	#define SLA_MASK_TOS 0x7f000000
	#define SLA_MASK_METRIC 0x00ffffff
	#define SLA_SHIFT_TOS 24

	/* asla_tosmetric breakdown */
	#define ASLA_FLAG_EXTERNAL 0x80000000
	#define ASLA_MASK_TOS 0x7f000000
	#define ASLA_SHIFT_TOS 24
	#define ASLA_MASK_METRIC 0x00ffffff

	/* multicast vertex type */
	#define MCLA_VERTEX_ROUTER 1
	#define MCLA_VERTEX_NETWORK 2

	/* link state advertisement header */
	struct lsa_hdr {
	u_int16_t ls_age;
	u_int8_t ls_options;
	u_int8_t ls_type;
	union {
	struct in_addr lsa_id;
	struct { /* opaque LSAs change the LSA-ID field */
	u_int8_t opaque_type;
	u_int8_t opaque_id[3];
	} opaque_field;
	} un_lsa_id;
	struct in_addr ls_router;
	u_int32_t ls_seq;
	u_int16_t ls_chksum;
	u_int16_t ls_length;
	};

	/* link state advertisement */
	struct lsa {
	struct lsa_hdr ls_hdr;

	/* Link state types */
	union {
	/* Router links advertisements */
	struct {
	u_int8_t rla_flags;
	u_int8_t rla_zero[1];
	u_int16_t rla_count;
	struct rlalink {
	struct in_addr link_id;
	struct in_addr link_data;
	u_int8_t link_type;
	u_int8_t link_toscount;
	u_int16_t link_tos0metric;
	} rla_link[1]; /* may repeat */
	} un_rla;

	/* Network links advertisements */
	struct {
	struct in_addr nla_mask;
	struct in_addr nla_router[1]; /* may repeat */
	} un_nla;

	/* Summary links advertisements */
	struct {
	struct in_addr sla_mask;
	u_int32_t sla_tosmetric[1]; /* may repeat */
	} un_sla;

	/* AS external links advertisements */
	struct {
	struct in_addr asla_mask;
	struct aslametric {
	u_int32_t asla_tosmetric;
	struct in_addr asla_forward;
	struct in_addr asla_tag;
	} asla_metric[1]; /* may repeat */
	} un_asla;

	/* Multicast group membership */
	struct mcla {
	u_int32_t mcla_vtype;
	struct in_addr mcla_vid;
	} un_mcla[1];

	/* Opaque TE LSA */
	struct {
	u_int16_t type;
	u_int16_t length;
	u_int8_t data[1]; /* may repeat */
	} un_te_lsa_tlv;

	/* Opaque Grace LSA */
	struct {
	u_int16_t type;
	u_int16_t length;
	u_int8_t data[1]; /* may repeat */
	} un_grace_tlv;

	/* Opaque Router information LSA */
	struct {
	u_int16_t type;
	u_int16_t length;
	u_int8_t data[1]; /* may repeat */
	} un_ri_tlv;

	/* Unknown LSA */
	struct unknown {
	u_int8_t data[1]; /* may repeat */
	} un_unknown[1];

	} lsa_un;
	};


	/*
	* TOS metric struct (will be 0 or more in router links update)
	*/
	struct tos_metric {
	u_int8_t tos_type;
	u_int8_t tos_zero;
	u_int16_t tos_metric;
	};

	#define OSPF_AUTH_SIZE 8

	/*
	* the main header
	*/
	struct ospfhdr {
	u_int8_t ospf_version;
	u_int8_t ospf_type;
	u_int16_t ospf_len;
	struct in_addr ospf_routerid;
	struct in_addr ospf_areaid;
	u_int16_t ospf_chksum;
	u_int16_t ospf_authtype;
	u_int8_t ospf_authdata[OSPF_AUTH_SIZE];
	union {

	/* Hello packet */
	struct {
	struct in_addr hello_mask;
	u_int16_t hello_helloint;
	u_int8_t hello_options;
	u_int8_t hello_priority;
	u_int32_t hello_deadint;
	struct in_addr hello_dr;
	struct in_addr hello_bdr;
	struct in_addr hello_neighbor[1]; /* may repeat */
	} un_hello;

	/* Database Description packet */
	struct {
	u_int8_t db_zero[2];
	u_int8_t db_options;
	u_int8_t db_flags;
	u_int32_t db_seq;
	struct lsa_hdr db_lshdr[1]; /* may repeat */
	} un_db;

	/* Link State Request */
	struct lsr {
	u_int8_t ls_type[4];
	union {
	struct in_addr ls_stateid;
	struct { /* opaque LSAs change the LSA-ID field */
	u_int8_t opaque_type;
	u_int8_t opaque_id[3];
	} opaque_field;
	} un_ls_stateid;
	struct in_addr ls_router;
	} un_lsr[1]; /* may repeat */

	/* Link State Update */
	struct {
	u_int32_t lsu_count;
	struct lsa lsu_lsa[1]; /* may repeat */
	} un_lsu;

	/* Link State Acknowledgement */
	struct {
	struct lsa_hdr lsa_lshdr[1]; /* may repeat */
	} un_lsa ;
	} ospf_un ;
	};

	#define ospf_hello ospf_un.un_hello
	#define ospf_db ospf_un.un_db
	#define ospf_lsr ospf_un.un_lsr
	#define ospf_lsu ospf_un.un_lsu
	#define ospf_lsa ospf_un.un_lsa