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   1 /* @(#) $Header: /tcpdump/master/tcpdump/ospf.h,v 1.9 2003-10-03 13:00:33 hannes Exp $ (LBL) */
   2 /*
   3  * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that: (1) source code distributions
   8  * retain the above copyright notice and this paragraph in its entirety, (2)
   9  * distributions including binary code include the above copyright notice and
  10  * this paragraph in its entirety in the documentation or other materials
  11  * provided with the distribution, and (3) all advertising materials mentioning
  12  * features or use of this software display the following acknowledgement:
  13  * ``This product includes software developed by the University of California,
  14  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  15  * the University nor the names of its contributors may be used to endorse
  16  * or promote products derived from this software without specific prior
  17  * written permission.
  18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  19  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  20  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  21  *
  22  * OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu)
  23  */
  24 #define OSPF_TYPE_UMD           0       /* UMd's special monitoring packets */
  25 #define OSPF_TYPE_HELLO         1       /* Hello */
  26 #define OSPF_TYPE_DD            2       /* Database Description */
  27 #define OSPF_TYPE_LS_REQ        3       /* Link State Request */
  28 #define OSPF_TYPE_LS_UPDATE     4       /* Link State Update */
  29 #define OSPF_TYPE_LS_ACK        5       /* Link State Ack */
  30
  31 /* Options field
  32  *
  33  * +------------------------------------+
  34  * | * | O | DC | EA | N/P | MC | E | T |
  35  * +------------------------------------+
  36  *
  37  */
  38
  39 #define OSPF_OPTION_T   0x01    /* T bit: TOS support   */
  40 #define OSPF_OPTION_E   0x02    /* E bit: External routes advertised    */
  41 #define OSPF_OPTION_MC  0x04    /* MC bit: Multicast capable */
  42 #define OSPF_OPTION_NP  0x08    /* N/P bit: NSSA capable */
  43 #define OSPF_OPTION_EA  0x10    /* EA bit: External Attribute capable */
  44 #define OSPF_OPTION_DC  0x20    /* DC bit: Demand circuit capable */
  45 #define OSPF_OPTION_O   0x40    /* O bit: Opaque LSA capable */
  46
  47 /* ospf_authtype        */
  48 #define OSPF_AUTH_NONE          0       /* No auth-data */
  49 #define OSPF_AUTH_SIMPLE        1       /* Simple password */
  50 #define OSPF_AUTH_MD5           2       /* MD5 authentication */
  51 #define OSPF_AUTH_MD5_LEN       16      /* length of MD5 authentication */
  52
  53 /* db_flags     */
  54 #define OSPF_DB_INIT            0x04        /*  */
  55 #define OSPF_DB_MORE            0x02
  56 #define OSPF_DB_MASTER          0x01
  57
  58 /* ls_type      */
  59 #define LS_TYPE_ROUTER          1   /* router link */
  60 #define LS_TYPE_NETWORK         2   /* network link */
  61 #define LS_TYPE_SUM_IP          3   /* summary link */
  62 #define LS_TYPE_SUM_ABR         4   /* summary area link */
  63 #define LS_TYPE_ASE             5   /* ASE  */
  64 #define LS_TYPE_GROUP           6   /* Group membership (multicast */
  65                                     /* extensions 23 July 1991) */
  66 #define LS_TYPE_NSSA            7   /* rfc1587 - Not so Stubby Areas */
  67 #define LS_TYPE_OPAQUE_LL       9   /* rfc2370 - Opaque Link Local */
  68 #define LS_TYPE_OPAQUE_AL      10   /* rfc2370 - Opaque Link Local */
  69 #define LS_TYPE_OPAQUE_DW      11   /* rfc2370 - Opaque Domain Wide */
  70
  71 /*************************************************
  72  *
  73  * is the above a bug in the documentation?
  74  *
  75  *************************************************/
  76
  77
  78 /* rla_link.link_type   */
  79 #define RLA_TYPE_ROUTER         1   /* point-to-point to another router */
  80 #define RLA_TYPE_TRANSIT        2   /* connection to transit network    */
  81 #define RLA_TYPE_STUB           3   /* connection to stub network       */
  82 #define RLA_TYPE_VIRTUAL        4   /* virtual link                     */
  83
  84 /* rla_flags    */
  85 #define RLA_FLAG_B      0x01
  86 #define RLA_FLAG_E      0x02
  87 #define RLA_FLAG_W1     0x04
  88 #define RLA_FLAG_W2     0x08
  89
  90 /* sla_tosmetric breakdown      */
  91 #define SLA_MASK_TOS            0x7f000000
  92 #define SLA_MASK_METRIC         0x00ffffff
  93 #define SLA_SHIFT_TOS           24
  94
  95 /* asla_tosmetric breakdown     */
  96 #define ASLA_FLAG_EXTERNAL      0x80000000
  97 #define ASLA_MASK_TOS           0x7f000000
  98 #define ASLA_SHIFT_TOS          24
  99 #define ASLA_MASK_METRIC        0x00ffffff
 100
 101 /* multicast vertex type */
 102 #define MCLA_VERTEX_ROUTER      1
 103 #define MCLA_VERTEX_NETWORK     2
 104
 105 /* link state advertisement header */
 106 struct lsa_hdr {
 107     u_int16_t ls_age;
 108     u_int8_t ls_options;
 109     u_int8_t ls_type;
 110     union {
 111         struct in_addr ls_stateid;
 112         struct { /* opaque LSAs change the LSA-ID field */
 113             u_int8_t opaque_type;
 114             u_int8_t opaque_id[3];
 115         };
 116     };
 117     struct in_addr ls_router;
 118     u_int32_t ls_seq;
 119     u_int16_t ls_chksum;
 120     u_int16_t ls_length;
 121 };
 122
 123 /* link state advertisement */
 124 struct lsa {
 125     struct lsa_hdr ls_hdr;
 126
 127     /* Link state types */
 128     union {
 129         /* Router links advertisements */
 130         struct {
 131             u_int8_t rla_flags;
 132             u_int8_t rla_zero[1];
 133             u_int16_t rla_count;
 134             struct rlalink {
 135                 struct in_addr link_id;
 136                 struct in_addr link_data;
 137                 u_int8_t link_type;
 138                 u_int8_t link_toscount;
 139                 u_int16_t link_tos0metric;
 140             } rla_link[1];              /* may repeat   */
 141         } un_rla;
 142
 143         /* Network links advertisements */
 144         struct {
 145             struct in_addr nla_mask;
 146             struct in_addr nla_router[1];       /* may repeat   */
 147         } un_nla;
 148
 149         /* Summary links advertisements */
 150         struct {
 151             struct in_addr sla_mask;
 152             u_int32_t sla_tosmetric[1]; /* may repeat   */
 153         } un_sla;
 154
 155         /* AS external links advertisements */
 156         struct {
 157             struct in_addr asla_mask;
 158             struct aslametric {
 159                 u_int32_t asla_tosmetric;
 160                 struct in_addr asla_forward;
 161                 struct in_addr asla_tag;
 162             } asla_metric[1];           /* may repeat   */
 163         } un_asla;
 164
 165         /* Multicast group membership */
 166         struct mcla {
 167             u_int32_t mcla_vtype;
 168             struct in_addr mcla_vid;
 169         } un_mcla[1];
 170
 171         /* Unknown LSA */
 172         struct unknown {
 173             u_int8_t data[1]; /* may repeat   */
 174         } un_unknown[1];
 175
 176     } lsa_un;
 177 };
 178
 179
 180 /*
 181  * TOS metric struct (will be 0 or more in router links update)
 182  */
 183 struct tos_metric {
 184     u_int8_t tos_type;
 185     u_int8_t tos_zero;
 186     u_int16_t tos_metric;
 187 };
 188
 189 #define OSPF_AUTH_SIZE  8
 190
 191 /*
 192  * the main header
 193  */
 194 struct ospfhdr {
 195     u_int8_t ospf_version;
 196     u_int8_t ospf_type;
 197     u_int16_t ospf_len;
 198     struct in_addr ospf_routerid;
 199     struct in_addr ospf_areaid;
 200     u_int16_t ospf_chksum;
 201     u_int16_t ospf_authtype;
 202     u_int8_t ospf_authdata[OSPF_AUTH_SIZE];
 203     union {
 204
 205         /* Hello packet */
 206         struct {
 207             struct in_addr hello_mask;
 208             u_int16_t hello_helloint;
 209             u_int8_t hello_options;
 210             u_int8_t hello_priority;
 211             u_int32_t hello_deadint;
 212             struct in_addr hello_dr;
 213             struct in_addr hello_bdr;
 214             struct in_addr hello_neighbor[1]; /* may repeat     */
 215         } un_hello;
 216
 217         /* Database Description packet */
 218         struct {
 219             u_int8_t db_zero[2];
 220             u_int8_t db_options;
 221             u_int8_t db_flags;
 222             u_int32_t db_seq;
 223             struct lsa_hdr db_lshdr[1]; /* may repeat   */
 224         } un_db;
 225
 226         /* Link State Request */
 227         struct lsr {
 228             u_int32_t ls_type;
 229             struct in_addr ls_stateid;
 230             struct in_addr ls_router;
 231         } un_lsr[1];            /* may repeat   */
 232
 233         /* Link State Update */
 234         struct {
 235             u_int32_t lsu_count;
 236             struct lsa lsu_lsa[1]; /* may repeat        */
 237         } un_lsu;
 238
 239         /* Link State Acknowledgement */
 240         struct {
 241             struct lsa_hdr lsa_lshdr[1]; /* may repeat  */
 242         } un_lsa ;
 243     } ospf_un ;
 244 };
 245
 246 #define ospf_hello      ospf_un.un_hello
 247 #define ospf_db         ospf_un.un_db
 248 #define ospf_lsr        ospf_un.un_lsr
 249 #define ospf_lsu        ospf_un.un_lsu
 250 #define ospf_lsa        ospf_un.un_lsa
 251