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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   /* rfc7770 */
  75 #define LS_OPAQUE_TYPE_EP       7   /* rfc7684 */
  76 #define LS_OPAQUE_TYPE_EL       8   /* rfc7684 */
  77
  78 #define LS_OPAQUE_TE_TLV_ROUTER 1   /* rfc3630 */
  79 #define LS_OPAQUE_TE_TLV_LINK   2   /* rfc3630 */
  80
  81 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE             1 /* rfc3630 */
  82 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID               2 /* rfc3630 */
  83 #define LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP              3 /* rfc3630 */
  84 #define LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP             4 /* rfc3630 */
  85 #define LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC             5 /* rfc3630 */
  86 #define LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW                6 /* rfc3630 */
  87 #define LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW            7 /* rfc3630 */
  88 #define LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW              8 /* rfc3630 */
  89 #define LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP           9 /* rfc3630 */
  90 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID 11 /* rfc4203 */
  91 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE 14 /* rfc4203 */
  92 #define LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR    15 /* rfc4203 */
  93 #define LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP    16 /* rfc4203 */
  94 #define LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS       17 /* rfc4124 */
  95
  96 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP        1  /* rfc3630 */
  97 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA         2  /* rfc3630 */
  98
  99 #define LS_OPAQUE_RI_SUBTLV_SID_LABEL                 1  /* rfc8665 */
 100
 101 #define LS_OPAQUE_EP_EXTD_PREFIX_TLV                  1  /* rfc7684 */
 102 #define LS_OPAQUE_EP_EXTD_PREFIX_RANGE_TLV            2  /* rfc8665 */
 103 #define LS_OPAQUE_EP_SUBTLV_PREFIX_SID                2  /* rfc8665 */
 104
 105 #define LS_OPAQUE_GRACE_TLV_PERIOD       1 /* rfc3623 */
 106 #define LS_OPAQUE_GRACE_TLV_REASON       2 /* rfc3623 */
 107 #define LS_OPAQUE_GRACE_TLV_INT_ADDRESS  3 /* rfc3623 */
 108
 109 #define LS_OPAQUE_GRACE_TLV_REASON_UNKNOWN     0 /* rfc3623 */
 110 #define LS_OPAQUE_GRACE_TLV_REASON_SW_RESTART  1 /* rfc3623 */
 111 #define LS_OPAQUE_GRACE_TLV_REASON_SW_UPGRADE  2 /* rfc3623 */
 112 #define LS_OPAQUE_GRACE_TLV_REASON_CP_SWITCH   3 /* rfc3623 */
 113
 114 #define LS_OPAQUE_RI_TLV_CAP               1 /* rfc7770 */
 115 #define LS_OPAQUE_RI_TLV_HOSTNAME          7 /* rfc5642 */
 116 #define LS_OPAQUE_RI_TLV_SR_ALGO           8 /* rfc8865 */
 117 #define LS_OPAQUE_RI_TLV_SID_LABEL_RANGE   9 /* rfc8865 */
 118 #define LS_OPAQUE_RI_TLV_SR_LOCAL_BLOCK   14 /* rfc8865 */
 119 #define LS_OPAQUE_RI_TLV_SRMS_PREFERENCE  15 /* rfc8865 */
 120
 121 /* rla_link.link_type   */
 122 #define RLA_TYPE_ROUTER         1   /* point-to-point to another router */
 123 #define RLA_TYPE_TRANSIT        2   /* connection to transit network    */
 124 #define RLA_TYPE_STUB           3   /* connection to stub network       */
 125 #define RLA_TYPE_VIRTUAL        4   /* virtual link                     */
 126
 127 /* rla_flags    */
 128 #define RLA_FLAG_B      0x01
 129 #define RLA_FLAG_E      0x02
 130 #define RLA_FLAG_V      0x04
 131 #define RLA_FLAG_W      0x08
 132 #define RLA_FLAG_NT     0x10 /* RFC3101 Appendix B */
 133 #define RLA_FLAG_H      0x80
 134
 135 /* sla_tosmetric breakdown      */
 136 #define SLA_MASK_TOS            0x7f000000
 137 #define SLA_MASK_METRIC         0x00ffffff
 138 #define SLA_SHIFT_TOS           24
 139
 140 /* asla_tosmetric breakdown     */
 141 #define ASLA_FLAG_EXTERNAL      0x80000000
 142 #define ASLA_MASK_TOS           0x7f000000
 143 #define ASLA_SHIFT_TOS          24
 144 #define ASLA_MASK_METRIC        0x00ffffff
 145
 146 /* multicast vertex type */
 147 #define MCLA_VERTEX_ROUTER      1
 148 #define MCLA_VERTEX_NETWORK     2
 149
 150 /* Link-Local-Signaling */
 151 #define OSPF_LLS_HDRLEN         4U /* RFC5613 Section 2.2 */
 152
 153 #define OSPF_LLS_EO             1  /* RFC4811, RFC4812 */
 154 #define OSPF_LLS_MD5            2  /* RFC4813 */
 155
 156 #define OSPF_LLS_EO_LR          0x00000001              /* RFC4811 */
 157 #define OSPF_LLS_EO_RS          0x00000002              /* RFC4812 */
 158
 159 /*
 160  * TOS metric struct (will be 0 or more in router links update)
 161  */
 162 struct tos_metric {
 163     nd_uint8_t  tos_type;
 164     nd_uint8_t  reserved;
 165     nd_uint16_t tos_metric;
 166 };
 167 struct tos_link {
 168     nd_uint8_t  link_type;
 169     nd_uint8_t  link_tos_count;
 170     nd_uint16_t tos_metric;
 171 };
 172 union un_tos {
 173     struct tos_link link;
 174     struct tos_metric metrics;
 175 };
 176
 177 /* link state advertisement header */
 178 struct lsa_hdr {
 179     nd_uint16_t ls_age;
 180     nd_uint8_t  ls_options;
 181     nd_uint8_t  ls_type;
 182     union {
 183         nd_ipv4 lsa_id;
 184         struct { /* opaque LSAs change the LSA-ID field */
 185             nd_uint8_t  opaque_type;
 186             nd_uint24_t opaque_id;
 187         } opaque_field;
 188     } un_lsa_id;
 189     nd_ipv4     ls_router;
 190     nd_uint32_t ls_seq;
 191     nd_uint16_t ls_chksum;
 192     nd_uint16_t ls_length;
 193 };
 194
 195 /* link state advertisement */
 196 struct lsa {
 197     struct lsa_hdr ls_hdr;
 198
 199     /* Link state types */
 200     union {
 201         /* Router links advertisements */
 202         struct {
 203             nd_uint8_t  rla_flags;
 204             nd_byte     rla_zero;
 205             nd_uint16_t rla_count;
 206             struct rlalink {
 207                 nd_ipv4 link_id;
 208                 nd_ipv4 link_data;
 209                 union un_tos un_tos;
 210             } rla_link[1];              /* may repeat   */
 211         } un_rla;
 212
 213         /* Network links advertisements */
 214         struct {
 215             nd_ipv4 nla_mask;
 216             nd_ipv4 nla_router[1];      /* may repeat   */
 217         } un_nla;
 218
 219         /* Summary links advertisements */
 220         struct {
 221             nd_ipv4     sla_mask;
 222             nd_uint32_t sla_tosmetric[1];       /* may repeat   */
 223         } un_sla;
 224
 225         /* AS external links advertisements */
 226         struct {
 227             nd_ipv4 asla_mask;
 228             struct aslametric {
 229                 nd_uint32_t asla_tosmetric;
 230                 nd_ipv4     asla_forward;
 231                 nd_ipv4     asla_tag;
 232             } asla_metric[1];           /* may repeat   */
 233         } un_asla;
 234
 235         /* Multicast group membership */
 236         struct mcla {
 237             nd_uint32_t mcla_vtype;
 238             nd_ipv4     mcla_vid;
 239         } un_mcla[1];
 240
 241         /* Opaque TE LSA */
 242         struct {
 243             nd_uint16_t type;
 244             nd_uint16_t length;
 245             nd_byte     data[1]; /* may repeat   */
 246         } un_te_lsa_tlv[1]; /* may repeat */
 247
 248         /* Opaque Grace LSA */
 249         struct {
 250             nd_uint16_t type;
 251             nd_uint16_t length;
 252             nd_byte     data[1]; /* may repeat   */
 253         } un_grace_tlv[1]; /* may repeat */
 254
 255         /* Opaque Router information LSA */
 256         struct {
 257             nd_uint16_t type;
 258             nd_uint16_t length;
 259             nd_byte     data[1]; /* may repeat   */
 260         } un_ri_tlv[1]; /* may repeat */
 261
 262         /* Extended Prefix LSA */
 263         struct {
 264             nd_uint16_t type;
 265             nd_uint16_t length;
 266             nd_byte     data[1]; /* may repeat   */
 267         } un_ep_tlv[1]; /* may repeat */
 268
 269         /* Unknown LSA */
 270         struct unknown {
 271             nd_byte data[1]; /* may repeat   */
 272         } un_unknown[1];
 273
 274     } lsa_un;
 275 };
 276
 277 #define OSPF_AUTH_SIZE  8
 278
 279 /*
 280  * the main header
 281  */
 282 struct ospfhdr {
 283     nd_uint8_t  ospf_version;
 284     nd_uint8_t  ospf_type;
 285     nd_uint16_t ospf_len;
 286     nd_ipv4     ospf_routerid;
 287     nd_ipv4     ospf_areaid;
 288     nd_uint16_t ospf_chksum;
 289     nd_uint16_t ospf_authtype;
 290     nd_byte     ospf_authdata[OSPF_AUTH_SIZE];
 291     union {
 292
 293         /* Hello packet */
 294         struct {
 295             nd_ipv4     hello_mask;
 296             nd_uint16_t hello_helloint;
 297             nd_uint8_t  hello_options;
 298             nd_uint8_t  hello_priority;
 299             nd_uint32_t hello_deadint;
 300             nd_ipv4     hello_dr;
 301             nd_ipv4     hello_bdr;
 302             nd_ipv4     hello_neighbor[1]; /* may repeat        */
 303         } un_hello;
 304
 305         /* Database Description packet */
 306         struct {
 307             nd_uint16_t db_ifmtu;
 308             nd_uint8_t  db_options;
 309             nd_uint8_t  db_flags;
 310             nd_uint32_t db_seq;
 311             struct lsa_hdr db_lshdr[1]; /* may repeat   */
 312         } un_db;
 313
 314         /* Link State Request */
 315         struct lsr {
 316             nd_uint32_t ls_type;
 317             union {
 318                 nd_ipv4 ls_stateid;
 319                 struct { /* opaque LSAs change the LSA-ID field */
 320                     nd_uint8_t  opaque_type;
 321                     nd_uint24_t opaque_id;
 322                 } opaque_field;
 323             } un_ls_stateid;
 324             nd_ipv4 ls_router;
 325         } un_lsr[1];            /* may repeat   */
 326
 327         /* Link State Update */
 328         struct {
 329             nd_uint32_t lsu_count;
 330             struct lsa  lsu_lsa[1]; /* may repeat       */
 331         } un_lsu;
 332
 333         /* Link State Acknowledgement */
 334         struct {
 335             struct lsa_hdr lsa_lshdr[1]; /* may repeat  */
 336         } un_lsa ;
 337     } ospf_un ;
 338 };
 339
 340 #define ospf_hello      ospf_un.un_hello
 341 #define ospf_db         ospf_un.un_db
 342 #define ospf_lsr        ospf_un.un_lsr
 343 #define ospf_lsu        ospf_un.un_lsu
 344 #define ospf_lsa        ospf_un.un_lsa