eigrpd/eigrp_structs.h

   1 /*
   2  * EIGRP Definition of Data Structures.
   3  * Copyright (C) 2013-2016
   4  * Authors:
   5  *   Donnie Savage
   6  *   Jan Janovic
   7  *   Matej Perina
   8  *   Peter Orsag
   9  *   Peter Paluch
  10  *   Frantisek Gazo
  11  *   Tomas Hvorkovy
  12  *   Martin Kontsek
  13  *   Lukas Koribsky
  14  *
  15  * This file is part of GNU Zebra.
  16  *
  17  * GNU Zebra is free software; you can redistribute it and/or modify it
  18  * under the terms of the GNU General Public License as published by the
  19  * Free Software Foundation; either version 2, or (at your option) any
  20  * later version.
  21  *
  22  * GNU Zebra is distributed in the hope that it will be useful, but
  23  * WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  25  * General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License along
  28  * with this program; see the file COPYING; if not, write to the Free Software
  29  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  30  */
  31
  32 #ifndef _ZEBRA_EIGRP_STRUCTS_H_
  33 #define _ZEBRA_EIGRP_STRUCTS_H_
  34
  35 #include "filter.h"
  36
  37 #include "eigrpd/eigrp_const.h"
  38 #include "eigrpd/eigrp_macros.h"
  39
  40 /* EIGRP master for system wide configuration and variables. */
  41 struct eigrp_master {
  42         /* EIGRP instance. */
  43         struct list *eigrp;
  44
  45         /* EIGRP thread master. */
  46         struct thread_master *master;
  47
  48         /* Zebra interface list. */
  49         struct list *iflist;
  50
  51         /* EIGRP start time. */
  52         time_t start_time;
  53
  54         /* Various EIGRP global configuration. */
  55         uint8_t options;
  56
  57 #define EIGRP_MASTER_SHUTDOWN (1 << 0) /* deferred-shutdown */
  58 };
  59
  60 struct eigrp_metrics {
  61         uint32_t delay;
  62         uint32_t bandwidth;
  63         unsigned char mtu[3];
  64         uint8_t hop_count;
  65         uint8_t reliability;
  66         uint8_t load;
  67         uint8_t tag;
  68         uint8_t flags;
  69 };
  70
  71 struct eigrp {
  72         uint16_t AS;     /* Autonomous system number */
  73         uint16_t vrid;       /* Virtual Router ID */
  74         uint8_t k_values[6]; /*Array for K values configuration*/
  75         uint8_t variance;    /*Metric variance multiplier*/
  76         uint8_t max_paths;   /*Maximum allowed paths for 1 prefix*/
  77
  78         /*Name of this EIGRP instance*/
  79         char *name;
  80
  81         /* EIGRP Router ID. */
  82         uint32_t router_id;     /* Configured automatically. */
  83         uint32_t router_id_static; /* Configured manually. */
  84
  85         struct list *eiflist;             /* eigrp interfaces */
  86         uint8_t passive_interface_default; /* passive-interface default */
  87
  88         unsigned int fd;
  89         unsigned int maxsndbuflen;
  90
  91         uint32_t sequence_number; /*Global EIGRP sequence number*/
  92
  93         struct stream *ibuf;
  94         struct list *oi_write_q;
  95
  96         /*Threads*/
  97         struct thread *t_write;
  98         struct thread *t_read;
  99         struct thread *t_distribute; /* timer for distribute list */
 100
 101         struct route_table *networks; /* EIGRP config networks. */
 102
 103         struct route_table *topology_table;
 104
 105         uint64_t serno; /* Global serial number counter for topology entry
 106                            changes*/
 107         uint64_t serno_last_update; /* Highest serial number of information send
 108                                        by last update*/
 109         struct list *topology_changes_internalIPV4;
 110         struct list *topology_changes_externalIPV4;
 111
 112         /*Neighbor self*/
 113         struct eigrp_neighbor *neighbor_self;
 114
 115         /*Configured metric for redistributed routes*/
 116         struct eigrp_metrics dmetric[ZEBRA_ROUTE_MAX + 1];
 117         int redistribute; /* Num of redistributed protocols. */
 118
 119         /* Access-list. */
 120         struct access_list *list[EIGRP_FILTER_MAX];
 121         /* Prefix-list. */
 122         struct prefix_list *prefix[EIGRP_FILTER_MAX];
 123         /* Route-map. */
 124         struct route_map *routemap[EIGRP_FILTER_MAX];
 125
 126         /* For redistribute route map. */
 127         struct {
 128                 char *name;
 129                 struct route_map *map;
 130                 int metric_config;
 131                 uint32_t metric;
 132         } route_map[ZEBRA_ROUTE_MAX];
 133
 134         QOBJ_FIELDS
 135 };
 136 DECLARE_QOBJ_TYPE(eigrp)
 137
 138 struct eigrp_if_params {
 139         uint8_t passive_interface;
 140         uint32_t v_hello;
 141         uint16_t v_wait;
 142         uint8_t type; /* type of interface */
 143         uint32_t bandwidth;
 144         uint32_t delay;
 145         uint8_t reliability;
 146         uint8_t load;
 147
 148         char *auth_keychain; /* Associated keychain with interface*/
 149         int auth_type;       /* EIGRP authentication type */
 150 };
 151
 152 enum { MEMBER_ALLROUTERS = 0,
 153        MEMBER_MAX,
 154 };
 155
 156 /*EIGRP interface structure*/
 157 struct eigrp_interface {
 158         struct eigrp_if_params params;
 159
 160         /*multicast group refcnts */
 161         bool member_allrouters;
 162
 163         /* This interface's parent eigrp instance. */
 164         struct eigrp *eigrp;
 165
 166         /* Interface data from zebra. */
 167         struct interface *ifp;
 168
 169         /* Packet send buffer. */
 170         struct eigrp_fifo *obuf; /* Output queue */
 171
 172         /* To which multicast groups do we currently belong? */
 173
 174
 175         uint8_t multicast_memberships;
 176
 177         /* EIGRP Network Type. */
 178         uint8_t type;
 179
 180         struct prefix *address;      /* Interface prefix */
 181         struct connected *connected; /* Pointer to connected */
 182
 183         /* Neighbor information. */
 184         struct list *nbrs; /* EIGRP Neighbor List */
 185
 186         /* Threads. */
 187         struct thread *t_hello;      /* timer */
 188         struct thread *t_distribute; /* timer for distribute list */
 189
 190         int on_write_q;
 191
 192         /* Statistics fields. */
 193         uint32_t hello_in;   /* Hello message input count. */
 194         uint32_t update_in;  /* Update message input count. */
 195         uint32_t query_in;   /* Querry message input count. */
 196         uint32_t reply_in;   /* Reply message input count. */
 197         uint32_t hello_out;  /* Hello message output count. */
 198         uint32_t update_out; /* Update message output count. */
 199         uint32_t query_out;  /* Query message output count. */
 200         uint32_t reply_out;  /* Reply message output count. */
 201         uint32_t siaQuery_in;
 202         uint32_t siaQuery_out;
 203         uint32_t siaReply_in;
 204         uint32_t siaReply_out;
 205         uint32_t ack_out;
 206         uint32_t ack_in;
 207
 208         uint32_t crypt_seqnum; /* Cryptographic Sequence Number */
 209
 210         /* Access-list. */
 211         struct access_list *list[EIGRP_FILTER_MAX];
 212         /* Prefix-list. */
 213         struct prefix_list *prefix[EIGRP_FILTER_MAX];
 214         /* Route-map. */
 215         struct route_map *routemap[EIGRP_FILTER_MAX];
 216 };
 217
 218 /* Determines if it is first or last packet
 219  * when packet consists of multiple packet
 220  * chunks because of many route TLV
 221  * (all won't fit into one packet) */
 222 enum Packet_part_type {
 223         EIGRP_PACKET_PART_NA,
 224         EIGRP_PACKET_PART_FIRST,
 225         EIGRP_PACKET_PART_LAST
 226 };
 227
 228 /* Neighbor Data Structure */
 229 struct eigrp_neighbor {
 230         /* This neighbor's parent eigrp interface. */
 231         struct eigrp_interface *ei;
 232
 233         /* EIGRP neighbor Information */
 234         uint8_t state; /* neigbor status. */
 235
 236         uint32_t recv_sequence_number; /* Last received sequence Number. */
 237         uint32_t init_sequence_number;
 238
 239         /*If packet is unacknowledged, we try to send it again 16 times*/
 240         uint8_t retrans_counter;
 241
 242         struct in_addr src; /* Neighbor Src address. */
 243
 244         uint8_t os_rel_major;  // system version - just for show
 245         uint8_t os_rel_minor;  // system version - just for show
 246         uint8_t tlv_rel_major; // eigrp version - tells us what TLV format to
 247                                // use
 248         uint8_t tlv_rel_minor; // eigrp version - tells us what TLV format to
 249                                // use
 250
 251         uint8_t K1;
 252         uint8_t K2;
 253         uint8_t K3;
 254         uint8_t K4;
 255         uint8_t K5;
 256         uint8_t K6;
 257
 258         /* Timer values. */
 259         uint16_t v_holddown;
 260
 261         /* Threads. */
 262         struct thread *t_holddown;
 263         struct thread *t_nbr_send_gr; /* thread for sending multiple GR packet
 264                                          chunks */
 265
 266         struct eigrp_fifo *retrans_queue;
 267         struct eigrp_fifo *multicast_queue;
 268
 269         uint32_t crypt_seqnum; /* Cryptographic Sequence Number. */
 270
 271         /* prefixes not received from neighbor during Graceful restart */
 272         struct list *nbr_gr_prefixes;
 273         /* prefixes not yet send to neighbor during Graceful restart */
 274         struct list *nbr_gr_prefixes_send;
 275         /* if packet is first or last during Graceful restart */
 276         enum Packet_part_type nbr_gr_packet_type;
 277 };
 278
 279 //---------------------------------------------------------------------------------------------------------------------------------------------
 280
 281
 282 struct eigrp_packet {
 283         struct eigrp_packet *next;
 284         struct eigrp_packet *previous;
 285
 286         /* Pointer to data stream. */
 287         struct stream *s;
 288
 289         /* IP destination address. */
 290         struct in_addr dst;
 291
 292         /*Packet retransmission thread*/
 293         struct thread *t_retrans_timer;
 294
 295         /*Packet retransmission counter*/
 296         uint8_t retrans_counter;
 297
 298         uint32_t sequence_number;
 299
 300         /* EIGRP packet length. */
 301         uint16_t length;
 302
 303         struct eigrp_neighbor *nbr;
 304 };
 305
 306 struct eigrp_fifo {
 307         struct eigrp_packet *head;
 308         struct eigrp_packet *tail;
 309
 310         unsigned long count;
 311 };
 312
 313 struct eigrp_header {
 314         uint8_t version;
 315         uint8_t opcode;
 316         uint16_t checksum;
 317         uint32_t flags;
 318         uint32_t sequence;
 319         uint32_t ack;
 320         uint16_t vrid;
 321         uint16_t ASNumber;
 322         char *tlv[0];
 323
 324 } __attribute__((packed));
 325
 326
 327 /**
 328  * Generic TLV type used for packet decoding.
 329  *
 330  *      +-----+------------------+
 331  *      |     |     |            |
 332  *      | Type| Len |    Vector  |
 333  *      |     |     |            |
 334  *      +-----+------------------+
 335  */
 336 struct eigrp_tlv_hdr_type {
 337         uint16_t type;
 338         uint16_t length;
 339         uint8_t value[0];
 340 } __attribute__((packed));
 341
 342 struct TLV_Parameter_Type {
 343         uint16_t type;
 344         uint16_t length;
 345         uint8_t K1;
 346         uint8_t K2;
 347         uint8_t K3;
 348         uint8_t K4;
 349         uint8_t K5;
 350         uint8_t K6;
 351         uint16_t hold_time;
 352 } __attribute__((packed));
 353
 354 struct TLV_MD5_Authentication_Type {
 355         uint16_t type;
 356         uint16_t length;
 357         uint16_t auth_type;
 358         uint16_t auth_length;
 359         uint32_t key_id;
 360         uint32_t key_sequence;
 361         uint8_t Nullpad[8];
 362         uint8_t digest[EIGRP_AUTH_TYPE_MD5_LEN];
 363
 364 } __attribute__((packed));
 365
 366 struct TLV_SHA256_Authentication_Type {
 367         uint16_t type;
 368         uint16_t length;
 369         uint16_t auth_type;
 370         uint16_t auth_length;
 371         uint32_t key_id;
 372         uint32_t key_sequence;
 373         uint8_t Nullpad[8];
 374         uint8_t digest[EIGRP_AUTH_TYPE_SHA256_LEN];
 375
 376 } __attribute__((packed));
 377
 378 struct TLV_Sequence_Type {
 379         uint16_t type;
 380         uint16_t length;
 381         uint8_t addr_length;
 382         struct in_addr *addresses;
 383 } __attribute__((packed));
 384
 385 struct TLV_Next_Multicast_Sequence {
 386         uint16_t type;
 387         uint16_t length;
 388         uint32_t multicast_sequence;
 389 } __attribute__((packed));
 390
 391 struct TLV_Software_Type {
 392         uint16_t type;
 393         uint16_t length;
 394         uint8_t vender_major;
 395         uint8_t vender_minor;
 396         uint8_t eigrp_major;
 397         uint8_t eigrp_minor;
 398 } __attribute__((packed));
 399
 400 struct TLV_IPv4_Internal_type {
 401         uint16_t type;
 402         uint16_t length;
 403         struct in_addr forward;
 404
 405         /*Metrics*/
 406         struct eigrp_metrics metric;
 407
 408         uint8_t prefix_length;
 409
 410         unsigned char destination_part[4];
 411         struct in_addr destination;
 412 } __attribute__((packed));
 413
 414 struct TLV_IPv4_External_type {
 415         uint16_t type;
 416         uint16_t length;
 417         struct in_addr next_hop;
 418         struct in_addr originating_router;
 419         uint32_t originating_as;
 420         uint32_t administrative_tag;
 421         uint32_t external_metric;
 422         uint16_t reserved;
 423         uint8_t external_protocol;
 424         uint8_t external_flags;
 425
 426         /*Metrics*/
 427         struct eigrp_metrics metric;
 428
 429         uint8_t prefix_length;
 430         unsigned char destination_part[4];
 431         struct in_addr destination;
 432 } __attribute__((packed));
 433
 434 /* EIGRP Peer Termination TLV - used for hard restart */
 435 struct TLV_Peer_Termination_type {
 436         uint16_t type;
 437         uint16_t length;
 438         uint8_t unknown;
 439         uint32_t neighbor_ip;
 440 } __attribute__((packed));
 441
 442 /* Who executed Graceful restart */
 443 enum GR_type { EIGRP_GR_MANUAL, EIGRP_GR_FILTER };
 444
 445 //---------------------------------------------------------------------------------------------------------------------------------------------
 446
 447 /* EIGRP Topology table node structure */
 448 struct eigrp_prefix_entry {
 449         struct list *entries, *rij;
 450         uint32_t fdistance;                   // FD
 451         uint32_t rdistance;                   // RD
 452         uint32_t distance;                    // D
 453         struct eigrp_metrics reported_metric; // RD for sending
 454
 455         uint8_t nt;      // network type
 456         uint8_t state;      // route fsm state
 457         uint8_t af;      // address family
 458         uint8_t req_action; // required action
 459
 460         struct prefix *destination;
 461
 462         // If network type is REMOTE_EXTERNAL, pointer will have reference to
 463         // its external TLV
 464         struct TLV_IPv4_External_type *extTLV;
 465
 466         uint64_t serno; /*Serial number for this entry. Increased with each
 467                            change of entry*/
 468 };
 469
 470 /* EIGRP Topology table record structure */
 471 struct eigrp_nexthop_entry {
 472         struct eigrp_prefix_entry *prefix;
 473         uint32_t reported_distance; // distance reported by neighbor
 474         uint32_t distance;        // sum of reported distance and link cost to
 475                                     // advertised neighbor
 476
 477         struct eigrp_metrics reported_metric;
 478         struct eigrp_metrics total_metric;
 479
 480         struct eigrp_neighbor *adv_router; // ip address of advertising neighbor
 481         uint8_t flags;                     // used for marking successor and FS
 482
 483         struct eigrp_interface *ei; // pointer for case of connected entry
 484 };
 485
 486 //---------------------------------------------------------------------------------------------------------------------------------------------
 487 typedef enum {
 488         EIGRP_CONNECTED,
 489         EIGRP_INT,
 490         EIGRP_EXT,
 491 } msg_data_t;
 492
 493 /* EIGRP Finite State Machine */
 494
 495 struct eigrp_fsm_action_message {
 496         uint8_t packet_type;               // UPDATE, QUERY, SIAQUERY, SIAREPLY
 497         struct eigrp *eigrp;               // which thread sent mesg
 498         struct eigrp_neighbor *adv_router; // advertising neighbor
 499         struct eigrp_nexthop_entry *entry;
 500         struct eigrp_prefix_entry *prefix;
 501         msg_data_t data_type; // internal or external tlv type
 502         struct eigrp_metrics metrics;
 503         enum metric_change change;
 504 };
 505
 506 #endif /* _ZEBRA_EIGRP_STRUCTURES_H_ */