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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_HELLO         1       /* Hello */
  24 #define OSPF_TYPE_DD            2       /* Database Description */
  25 #define OSPF_TYPE_LS_REQ        3       /* Link State Request */
  26 #define OSPF_TYPE_LS_UPDATE     4       /* Link State Update */
  27 #define OSPF_TYPE_LS_ACK        5       /* Link State Ack */
  28
  29 /* Options field
  30  *
  31  * +------------------------------------+
  32  * | DN | O | DC | L | N/P | MC | E | T |
  33  * +------------------------------------+
  34  *
  35  */
  36
  37 #define OSPF_OPTION_MT  0x01    /* MT bit: multi-topology */
  38 #define OSPF_OPTION_E   0x02    /* E bit: External routes advertised */
  39 #define OSPF_OPTION_MC  0x04    /* MC bit: Multicast capable */
  40 #define OSPF_OPTION_NP  0x08    /* N/P bit: NSSA capable */
  41 #define OSPF_OPTION_L   0x10    /* L bit: Packet contains LLS data block */
  42 #define OSPF_OPTION_DC  0x20    /* DC bit: Demand circuit capable */
  43 #define OSPF_OPTION_O   0x40    /* O bit: Opaque LSA capable */
  44 #define OSPF_OPTION_DN  0x80    /* DN bit: Up/Down Bit capable - draft-ietf-ospf-2547-dnbit-04 */
  45
  46 /* ospf_authtype        */
  47 #define OSPF_AUTH_NONE          0       /* No auth-data */
  48 #define OSPF_AUTH_SIMPLE        1       /* Simple password */
  49 #define OSPF_AUTH_SIMPLE_LEN    8       /* max length of simple authentication */
  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 #define OSPF_DB_RESYNC          0x08  /* RFC4811 */
  58
  59 /* ls_type      */
  60 #define LS_TYPE_ROUTER          1   /* router link */
  61 #define LS_TYPE_NETWORK         2   /* network link */
  62 #define LS_TYPE_SUM_IP          3   /* summary link */
  63 #define LS_TYPE_SUM_ABR         4   /* summary area link */
  64 #define LS_TYPE_ASE             5   /* ASE  */
  65 #define LS_TYPE_GROUP           6   /* Group membership (multicast */
  66                                     /* extensions 23 July 1991) */
  67 #define LS_TYPE_NSSA            7   /* rfc3101 - Not so Stubby Areas */
  68 #define LS_TYPE_OPAQUE_LL       9   /* rfc2370 - Opaque Link Local */
  69 #define LS_TYPE_OPAQUE_AL      10   /* rfc2370 - Opaque Link Local */
  70 #define LS_TYPE_OPAQUE_DW      11   /* rfc2370 - Opaque Domain Wide */
  71
  72 #define LS_OPAQUE_TYPE_TE       1   /* rfc3630 */
  73 #define LS_OPAQUE_TYPE_GRACE    3   /* rfc3623 */
  74 #define LS_OPAQUE_TYPE_RI       4   /* draft-ietf-ospf-cap-03 */
  75
  76 #define LS_OPAQUE_TE_TLV_ROUTER 1   /* rfc3630 */
  77 #define LS_OPAQUE_TE_TLV_LINK   2   /* rfc3630 */
  78
  79 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE             1 /* rfc3630 */
  80 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID               2 /* rfc3630 */
  81 #define LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP              3 /* rfc3630 */
  82 #define LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP             4 /* rfc3630 */
  83 #define LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC             5 /* rfc3630 */
  84 #define LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW                6 /* rfc3630 */
  85 #define LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW            7 /* rfc3630 */
  86 #define LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW              8 /* rfc3630 */
  87 #define LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP           9 /* rfc3630 */
  88 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID 11 /* rfc4203 */
  89 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE 14 /* rfc4203 */
  90 #define LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR    15 /* rfc4203 */
  91 #define LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP    16 /* rfc4203 */
  92 #define LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS       17 /* rfc4124 */
  93
  94 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP        1  /* rfc3630 */
  95 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA         2  /* rfc3630 */
  96
  97 #define LS_OPAQUE_GRACE_TLV_PERIOD       1 /* rfc3623 */
  98 #define LS_OPAQUE_GRACE_TLV_REASON       2 /* rfc3623 */
  99 #define LS_OPAQUE_GRACE_TLV_INT_ADDRESS  3 /* rfc3623 */
 100
 101 #define LS_OPAQUE_GRACE_TLV_REASON_UNKNOWN     0 /* rfc3623 */
 102 #define LS_OPAQUE_GRACE_TLV_REASON_SW_RESTART  1 /* rfc3623 */
 103 #define LS_OPAQUE_GRACE_TLV_REASON_SW_UPGRADE  2 /* rfc3623 */
 104 #define LS_OPAQUE_GRACE_TLV_REASON_CP_SWITCH   3 /* rfc3623 */
 105
 106 #define LS_OPAQUE_RI_TLV_CAP             1 /* draft-ietf-ospf-cap-03 */
 107
 108
 109 /* rla_link.link_type   */
 110 #define RLA_TYPE_ROUTER         1   /* point-to-point to another router */
 111 #define RLA_TYPE_TRANSIT        2   /* connection to transit network    */
 112 #define RLA_TYPE_STUB           3   /* connection to stub network       */
 113 #define RLA_TYPE_VIRTUAL        4   /* virtual link                     */
 114
 115 /* rla_flags    */
 116 #define RLA_FLAG_B      0x01
 117 #define RLA_FLAG_E      0x02
 118 #define RLA_FLAG_V      0x04
 119 #define RLA_FLAG_W      0x08
 120 #define RLA_FLAG_NT     0x10 /* RFC3101 Appendix B */
 121 #define RLA_FLAG_H      0x80
 122
 123 /* sla_tosmetric breakdown      */
 124 #define SLA_MASK_TOS            0x7f000000
 125 #define SLA_MASK_METRIC         0x00ffffff
 126 #define SLA_SHIFT_TOS           24
 127
 128 /* asla_tosmetric breakdown     */
 129 #define ASLA_FLAG_EXTERNAL      0x80000000
 130 #define ASLA_MASK_TOS           0x7f000000
 131 #define ASLA_SHIFT_TOS          24
 132 #define ASLA_MASK_METRIC        0x00ffffff
 133
 134 /* multicast vertex type */
 135 #define MCLA_VERTEX_ROUTER      1
 136 #define MCLA_VERTEX_NETWORK     2
 137
 138 /* Link-Local-Signaling */
 139 #define OSPF_LLS_HDRLEN         4U /* RFC5613 Section 2.2 */
 140
 141 #define OSPF_LLS_EO             1  /* RFC4811, RFC4812 */
 142 #define OSPF_LLS_MD5            2  /* RFC4813 */
 143
 144 #define OSPF_LLS_EO_LR          0x00000001              /* RFC4811 */
 145 #define OSPF_LLS_EO_RS          0x00000002              /* RFC4812 */
 146
 147 /*
 148  * TOS metric struct (will be 0 or more in router links update)
 149  */
 150 struct tos_metric {
 151     nd_uint8_t  tos_type;
 152     nd_uint8_t  reserved;
 153     nd_uint16_t tos_metric;
 154 };
 155 struct tos_link {
 156     nd_uint8_t  link_type;
 157     nd_uint8_t  link_tos_count;
 158     nd_uint16_t tos_metric;
 159 };
 160 union un_tos {
 161     struct tos_link link;
 162     struct tos_metric metrics;
 163 };
 164
 165 /* link state advertisement header */
 166 struct lsa_hdr {
 167     nd_uint16_t ls_age;
 168     nd_uint8_t  ls_options;
 169     nd_uint8_t  ls_type;
 170     union {
 171         nd_ipv4 lsa_id;
 172         struct { /* opaque LSAs change the LSA-ID field */
 173             nd_uint8_t  opaque_type;
 174             nd_uint24_t opaque_id;
 175         } opaque_field;
 176     } un_lsa_id;
 177     nd_ipv4     ls_router;
 178     nd_uint32_t ls_seq;
 179     nd_uint16_t ls_chksum;
 180     nd_uint16_t ls_length;
 181 };
 182
 183 /* link state advertisement */
 184 struct lsa {
 185     struct lsa_hdr ls_hdr;
 186
 187     /* Link state types */
 188     union {
 189         /* Router links advertisements */
 190         struct {
 191             nd_uint8_t  rla_flags;
 192             nd_byte     rla_zero;
 193             nd_uint16_t rla_count;
 194             struct rlalink {
 195                 nd_ipv4 link_id;
 196                 nd_ipv4 link_data;
 197                 union un_tos un_tos;
 198             } rla_link[1];              /* may repeat   */
 199         } un_rla;
 200
 201         /* Network links advertisements */
 202         struct {
 203             nd_ipv4 nla_mask;
 204             nd_ipv4 nla_router[1];      /* may repeat   */
 205         } un_nla;
 206
 207         /* Summary links advertisements */
 208         struct {
 209             nd_ipv4     sla_mask;
 210             nd_uint32_t sla_tosmetric[1];       /* may repeat   */
 211         } un_sla;
 212
 213         /* AS external links advertisements */
 214         struct {
 215             nd_ipv4 asla_mask;
 216             struct aslametric {
 217                 nd_uint32_t asla_tosmetric;
 218                 nd_ipv4     asla_forward;
 219                 nd_ipv4     asla_tag;
 220             } asla_metric[1];           /* may repeat   */
 221         } un_asla;
 222
 223         /* Multicast group membership */
 224         struct mcla {
 225             nd_uint32_t mcla_vtype;
 226             nd_ipv4     mcla_vid;
 227         } un_mcla[1];
 228
 229         /* Opaque TE LSA */
 230         struct {
 231             nd_uint16_t type;
 232             nd_uint16_t length;
 233             nd_byte     data[1]; /* may repeat   */
 234         } un_te_lsa_tlv[1]; /* may repeat */
 235
 236         /* Opaque Grace LSA */
 237         struct {
 238             nd_uint16_t type;
 239             nd_uint16_t length;
 240             nd_byte     data[1]; /* may repeat   */
 241         } un_grace_tlv[1]; /* may repeat */
 242
 243         /* Opaque Router information LSA */
 244         struct {
 245             nd_uint16_t type;
 246             nd_uint16_t length;
 247             nd_byte     data[1]; /* may repeat   */
 248         } un_ri_tlv[1]; /* may repeat */
 249
 250         /* Unknown LSA */
 251         struct unknown {
 252             nd_byte data[1]; /* may repeat   */
 253         } un_unknown[1];
 254
 255     } lsa_un;
 256 };
 257
 258 #define OSPF_AUTH_SIZE  8
 259
 260 /*
 261  * the main header
 262  */
 263 struct ospfhdr {
 264     nd_uint8_t  ospf_version;
 265     nd_uint8_t  ospf_type;
 266     nd_uint16_t ospf_len;
 267     nd_ipv4     ospf_routerid;
 268     nd_ipv4     ospf_areaid;
 269     nd_uint16_t ospf_chksum;
 270     nd_uint16_t ospf_authtype;
 271     nd_byte     ospf_authdata[OSPF_AUTH_SIZE];
 272     union {
 273
 274         /* Hello packet */
 275         struct {
 276             nd_ipv4     hello_mask;
 277             nd_uint16_t hello_helloint;
 278             nd_uint8_t  hello_options;
 279             nd_uint8_t  hello_priority;
 280             nd_uint32_t hello_deadint;
 281             nd_ipv4     hello_dr;
 282             nd_ipv4     hello_bdr;
 283             nd_ipv4     hello_neighbor[1]; /* may repeat        */
 284         } un_hello;
 285
 286         /* Database Description packet */
 287         struct {
 288             nd_uint16_t db_ifmtu;
 289             nd_uint8_t  db_options;
 290             nd_uint8_t  db_flags;
 291             nd_uint32_t db_seq;
 292             struct lsa_hdr db_lshdr[1]; /* may repeat   */
 293         } un_db;
 294
 295         /* Link State Request */
 296         struct lsr {
 297             nd_uint32_t ls_type;
 298             union {
 299                 nd_ipv4 ls_stateid;
 300                 struct { /* opaque LSAs change the LSA-ID field */
 301                     nd_uint8_t  opaque_type;
 302                     nd_uint24_t opaque_id;
 303                 } opaque_field;
 304             } un_ls_stateid;
 305             nd_ipv4 ls_router;
 306         } un_lsr[1];            /* may repeat   */
 307
 308         /* Link State Update */
 309         struct {
 310             nd_uint32_t lsu_count;
 311             struct lsa  lsu_lsa[1]; /* may repeat       */
 312         } un_lsu;
 313
 314         /* Link State Acknowledgement */
 315         struct {
 316             struct lsa_hdr lsa_lshdr[1]; /* may repeat  */
 317         } un_lsa ;
 318     } ospf_un ;
 319 };
 320
 321 #define ospf_hello      ospf_un.un_hello
 322 #define ospf_db         ospf_un.un_db
 323 #define ospf_lsr        ospf_un.un_lsr
 324 #define ospf_lsu        ospf_un.un_lsu
 325 #define ospf_lsa        ospf_un.un_lsa