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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_T   0x01    /* T bit: TOS support   */
  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_EA  0x10    /* EA bit: External Attribute capable */
  42 #define OSPF_OPTION_L   0x10    /* L bit: Packet contains LLS data block */
  43 #define OSPF_OPTION_DC  0x20    /* DC bit: Demand circuit capable */
  44 #define OSPF_OPTION_O   0x40    /* O bit: Opaque LSA capable */
  45 #define OSPF_OPTION_DN  0x80    /* DN bit: Up/Down Bit capable - draft-ietf-ospf-2547-dnbit-04 */
  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_SIMPLE_LEN    8       /* max length of simple authentication */
  51 #define OSPF_AUTH_MD5           2       /* MD5 authentication */
  52 #define OSPF_AUTH_MD5_LEN       16      /* length of MD5 authentication */
  53
  54 /* db_flags     */
  55 #define OSPF_DB_INIT            0x04
  56 #define OSPF_DB_MORE            0x02
  57 #define OSPF_DB_MASTER          0x01
  58 #define OSPF_DB_RESYNC          0x08  /* RFC4811 */
  59
  60 /* ls_type      */
  61 #define LS_TYPE_ROUTER          1   /* router link */
  62 #define LS_TYPE_NETWORK         2   /* network link */
  63 #define LS_TYPE_SUM_IP          3   /* summary link */
  64 #define LS_TYPE_SUM_ABR         4   /* summary area link */
  65 #define LS_TYPE_ASE             5   /* ASE  */
  66 #define LS_TYPE_GROUP           6   /* Group membership (multicast */
  67                                     /* extensions 23 July 1991) */
  68 #define LS_TYPE_NSSA            7   /* rfc3101 - Not so Stubby Areas */
  69 #define LS_TYPE_OPAQUE_LL       9   /* rfc2370 - Opaque Link Local */
  70 #define LS_TYPE_OPAQUE_AL      10   /* rfc2370 - Opaque Link Local */
  71 #define LS_TYPE_OPAQUE_DW      11   /* rfc2370 - Opaque Domain Wide */
  72
  73 #define LS_OPAQUE_TYPE_TE       1   /* rfc3630 */
  74 #define LS_OPAQUE_TYPE_GRACE    3   /* rfc3623 */
  75 #define LS_OPAQUE_TYPE_RI       4   /* draft-ietf-ospf-cap-03 */
  76
  77 #define LS_OPAQUE_TE_TLV_ROUTER 1   /* rfc3630 */
  78 #define LS_OPAQUE_TE_TLV_LINK   2   /* rfc3630 */
  79
  80 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE             1 /* rfc3630 */
  81 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID               2 /* rfc3630 */
  82 #define LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP              3 /* rfc3630 */
  83 #define LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP             4 /* rfc3630 */
  84 #define LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC             5 /* rfc3630 */
  85 #define LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW                6 /* rfc3630 */
  86 #define LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW            7 /* rfc3630 */
  87 #define LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW              8 /* rfc3630 */
  88 #define LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP           9 /* rfc3630 */
  89 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID 11 /* rfc4203 */
  90 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE 14 /* rfc4203 */
  91 #define LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR    15 /* rfc4203 */
  92 #define LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP    16 /* rfc4203 */
  93 #define LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS       17 /* rfc4124 */
  94
  95 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP        1  /* rfc3630 */
  96 #define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA         2  /* rfc3630 */
  97
  98 #define LS_OPAQUE_GRACE_TLV_PERIOD       1 /* rfc3623 */
  99 #define LS_OPAQUE_GRACE_TLV_REASON       2 /* rfc3623 */
 100 #define LS_OPAQUE_GRACE_TLV_INT_ADDRESS  3 /* rfc3623 */
 101
 102 #define LS_OPAQUE_GRACE_TLV_REASON_UNKNOWN     0 /* rfc3623 */
 103 #define LS_OPAQUE_GRACE_TLV_REASON_SW_RESTART  1 /* rfc3623 */
 104 #define LS_OPAQUE_GRACE_TLV_REASON_SW_UPGRADE  2 /* rfc3623 */
 105 #define LS_OPAQUE_GRACE_TLV_REASON_CP_SWITCH   3 /* rfc3623 */
 106
 107 #define LS_OPAQUE_RI_TLV_CAP             1 /* draft-ietf-ospf-cap-03 */
 108
 109
 110 /* rla_link.link_type   */
 111 #define RLA_TYPE_ROUTER         1   /* point-to-point to another router */
 112 #define RLA_TYPE_TRANSIT        2   /* connection to transit network    */
 113 #define RLA_TYPE_STUB           3   /* connection to stub network       */
 114 #define RLA_TYPE_VIRTUAL        4   /* virtual link                     */
 115
 116 /* rla_flags    */
 117 #define RLA_FLAG_B      0x01
 118 #define RLA_FLAG_E      0x02
 119 #define RLA_FLAG_W1     0x04
 120 #define RLA_FLAG_W2     0x08
 121
 122 /* sla_tosmetric breakdown      */
 123 #define SLA_MASK_TOS            0x7f000000
 124 #define SLA_MASK_METRIC         0x00ffffff
 125 #define SLA_SHIFT_TOS           24
 126
 127 /* asla_tosmetric breakdown     */
 128 #define ASLA_FLAG_EXTERNAL      0x80000000
 129 #define ASLA_MASK_TOS           0x7f000000
 130 #define ASLA_SHIFT_TOS          24
 131 #define ASLA_MASK_METRIC        0x00ffffff
 132
 133 /* multicast vertex type */
 134 #define MCLA_VERTEX_ROUTER      1
 135 #define MCLA_VERTEX_NETWORK     2
 136
 137 /* Link-Local-Signaling */
 138 #define OSPF_LLS_HDRLEN         4U /* RFC5613 Section 2.2 */
 139
 140 #define OSPF_LLS_EO             1  /* RFC4811, RFC4812 */
 141 #define OSPF_LLS_MD5            2  /* RFC4813 */
 142
 143 #define OSPF_LLS_EO_LR          0x00000001              /* RFC4811 */
 144 #define OSPF_LLS_EO_RS          0x00000002              /* RFC4812 */
 145
 146 /*
 147  * TOS metric struct (will be 0 or more in router links update)
 148  */
 149 struct tos_metric {
 150     nd_uint8_t  tos_type;
 151     nd_uint8_t  reserved;
 152     nd_uint16_t tos_metric;
 153 };
 154 struct tos_link {
 155     nd_uint8_t  link_type;
 156     nd_uint8_t  link_tos_count;
 157     nd_uint16_t tos_metric;
 158 };
 159 union un_tos {
 160     struct tos_link link;
 161     struct tos_metric metrics;
 162 };
 163
 164 /* link state advertisement header */
 165 struct lsa_hdr {
 166     nd_uint16_t ls_age;
 167     nd_uint8_t  ls_options;
 168     nd_uint8_t  ls_type;
 169     union {
 170         struct in_addr lsa_id;
 171         struct { /* opaque LSAs change the LSA-ID field */
 172             nd_uint8_t  opaque_type;
 173             nd_uint24_t opaque_id;
 174         } opaque_field;
 175     } un_lsa_id;
 176     struct in_addr ls_router;
 177     nd_uint32_t ls_seq;
 178     nd_uint16_t ls_chksum;
 179     nd_uint16_t ls_length;
 180 };
 181
 182 /* link state advertisement */
 183 struct lsa {
 184     struct lsa_hdr ls_hdr;
 185
 186     /* Link state types */
 187     union {
 188         /* Router links advertisements */
 189         struct {
 190             nd_uint8_t  rla_flags;
 191             nd_byte     rla_zero;
 192             nd_uint16_t rla_count;
 193             struct rlalink {
 194                 struct in_addr link_id;
 195                 struct in_addr link_data;
 196                 union un_tos un_tos;
 197             } rla_link[1];              /* may repeat   */
 198         } un_rla;
 199
 200         /* Network links advertisements */
 201         struct {
 202             struct in_addr nla_mask;
 203             struct in_addr nla_router[1];       /* may repeat   */
 204         } un_nla;
 205
 206         /* Summary links advertisements */
 207         struct {
 208             struct in_addr sla_mask;
 209             nd_uint32_t sla_tosmetric[1];       /* may repeat   */
 210         } un_sla;
 211
 212         /* AS external links advertisements */
 213         struct {
 214             struct in_addr asla_mask;
 215             struct aslametric {
 216                 nd_uint32_t asla_tosmetric;
 217                 struct in_addr asla_forward;
 218                 struct in_addr asla_tag;
 219             } asla_metric[1];           /* may repeat   */
 220         } un_asla;
 221
 222         /* Multicast group membership */
 223         struct mcla {
 224             nd_uint32_t mcla_vtype;
 225             struct in_addr mcla_vid;
 226         } un_mcla[1];
 227
 228         /* Opaque TE LSA */
 229         struct {
 230             nd_uint16_t type;
 231             nd_uint16_t length;
 232             nd_byte     data[1]; /* may repeat   */
 233         } un_te_lsa_tlv[1]; /* may repeat */
 234
 235         /* Opaque Grace LSA */
 236         struct {
 237             nd_uint16_t type;
 238             nd_uint16_t length;
 239             nd_byte     data[1]; /* may repeat   */
 240         } un_grace_tlv[1]; /* may repeat */
 241
 242         /* Opaque Router information LSA */
 243         struct {
 244             nd_uint16_t type;
 245             nd_uint16_t length;
 246             nd_byte     data[1]; /* may repeat   */
 247         } un_ri_tlv[1]; /* may repeat */
 248
 249         /* Unknown LSA */
 250         struct unknown {
 251             nd_byte data[1]; /* may repeat   */
 252         } un_unknown[1];
 253
 254     } lsa_un;
 255 };
 256
 257 #define OSPF_AUTH_SIZE  8
 258
 259 /*
 260  * the main header
 261  */
 262 struct ospfhdr {
 263     nd_uint8_t  ospf_version;
 264     nd_uint8_t  ospf_type;
 265     nd_uint16_t ospf_len;
 266     struct in_addr ospf_routerid;
 267     struct in_addr ospf_areaid;
 268     nd_uint16_t ospf_chksum;
 269     nd_uint16_t ospf_authtype;
 270     nd_byte     ospf_authdata[OSPF_AUTH_SIZE];
 271     union {
 272
 273         /* Hello packet */
 274         struct {
 275             struct in_addr hello_mask;
 276             nd_uint16_t hello_helloint;
 277             nd_uint8_t  hello_options;
 278             nd_uint8_t  hello_priority;
 279             nd_uint32_t hello_deadint;
 280             struct in_addr hello_dr;
 281             struct in_addr hello_bdr;
 282             struct in_addr hello_neighbor[1]; /* may repeat     */
 283         } un_hello;
 284
 285         /* Database Description packet */
 286         struct {
 287             nd_uint16_t db_ifmtu;
 288             nd_uint8_t  db_options;
 289             nd_uint8_t  db_flags;
 290             nd_uint32_t db_seq;
 291             struct lsa_hdr db_lshdr[1]; /* may repeat   */
 292         } un_db;
 293
 294         /* Link State Request */
 295         struct lsr {
 296             nd_uint32_t ls_type;
 297             union {
 298                 struct in_addr ls_stateid;
 299                 struct { /* opaque LSAs change the LSA-ID field */
 300                     nd_uint8_t  opaque_type;
 301                     nd_uint24_t opaque_id;
 302                 } opaque_field;
 303             } un_ls_stateid;
 304             struct in_addr ls_router;
 305         } un_lsr[1];            /* may repeat   */
 306
 307         /* Link State Update */
 308         struct {
 309             nd_uint32_t lsu_count;
 310             struct lsa  lsu_lsa[1]; /* may repeat       */
 311         } un_lsu;
 312
 313         /* Link State Acknowledgement */
 314         struct {
 315             struct lsa_hdr lsa_lshdr[1]; /* may repeat  */
 316         } un_lsa ;
 317     } ospf_un ;
 318 };
 319
 320 #define ospf_hello      ospf_un.un_hello
 321 #define ospf_db         ospf_un.un_db
 322 #define ospf_lsr        ospf_un.un_lsr
 323 #define ospf_lsu        ospf_un.un_lsu
 324 #define ospf_lsa        ospf_un.un_lsa