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