ospf.h

This directory contains source code for tcpdump, a tool for network monitoring and data acquisition

/*
 * Copyright (c) 1991, 1993, 1994, 1995, 1996
 *      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 ([e-mail])
 */
#define OSPF_TYPE_UMD        0     /* UMd's special monitoring packets */
#define OSPF_TYPE_HELLO      1     /* Hello */
#define OSPF_TYPE_DB         2     /* Database Description */
#define OSPF_TYPE_LSR        3     /* Link State Request */
#define OSPF_TYPE_LSU        4     /* Link State Update */
#define OSPF_TYPE_LSA        5     /* Link State Ack */
#define OSPF_TYPE_MAX        6

/* Options *_options
 */
#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 */

/* ospf_authtype
 */
#define OSPF_AUTH_NONE       0     /* No auth-data */
#define OSPF_AUTH_SIMPLE     1     /* Simple password */
#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 */
#define LS_TYPE_MAX          7

/*************************************************
 *
 * 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_short        ls_age;
       u_char         ls_options;
       u_char         ls_type;
       struct in_addr ls_stateid;
       struct in_addr ls_router;
       u_int32_t      ls_seq;
       u_short        ls_chksum;
       u_short        ls_length;
     };

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

       /* Link state types */
       union {
         /* Router links advertisements */
         struct {
           u_char  rla_flags;
           u_char  rla_zero[1];
           u_short rla_count;
           struct rlalink {
             struct in_addr link_id;
             struct in_addr link_data;
             u_char         link_type;
             u_char         link_toscount;
             u_short        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];
       } lsa_un;
     };


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

#define OSPF_AUTH_SIZE  8

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

         /* Hello packet */
         struct {
           struct in_addr hello_mask;
           u_short        hello_helloint;
           u_char         hello_options;
           u_char         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_char         db_zero[2];
           u_char         db_options;
           u_char         db_flags;
           u_int32_t      db_seq;
           struct lsa_hdr db_lshdr[1]; /* may repeat   */
         } un_db;

         /* Link State Request */
         struct lsr {
           u_int32_t      ls_type;
           struct in_addr 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