eigrpd/eigrp_interface.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * EIGRP Interface Functions.
   4  * Copyright (C) 2013-2016
   5  * Authors:
   6  *   Donnie Savage
   7  *   Jan Janovic
   8  *   Matej Perina
   9  *   Peter Orsag
  10  *   Peter Paluch
  11  *   Frantisek Gazo
  12  *   Tomas Hvorkovy
  13  *   Martin Kontsek
  14  *   Lukas Koribsky
  15  */
  16
  17 #include <zebra.h>
  18
  19 #include "frrevent.h"
  20 #include "linklist.h"
  21 #include "prefix.h"
  22 #include "if.h"
  23 #include "table.h"
  24 #include "memory.h"
  25 #include "network.h"
  26 #include "command.h"
  27 #include "stream.h"
  28 #include "log.h"
  29 #include "keychain.h"
  30 #include "vrf.h"
  31
  32 #include "eigrpd/eigrp_structs.h"
  33 #include "eigrpd/eigrpd.h"
  34 #include "eigrpd/eigrp_interface.h"
  35 #include "eigrpd/eigrp_neighbor.h"
  36 #include "eigrpd/eigrp_packet.h"
  37 #include "eigrpd/eigrp_zebra.h"
  38 #include "eigrpd/eigrp_vty.h"
  39 #include "eigrpd/eigrp_network.h"
  40 #include "eigrpd/eigrp_topology.h"
  41 #include "eigrpd/eigrp_fsm.h"
  42 #include "eigrpd/eigrp_dump.h"
  43 #include "eigrpd/eigrp_types.h"
  44 #include "eigrpd/eigrp_metric.h"
  45
  46 DEFINE_MTYPE_STATIC(EIGRPD, EIGRP_IF,      "EIGRP interface");
  47 DEFINE_MTYPE_STATIC(EIGRPD, EIGRP_IF_INFO, "EIGRP Interface Information");
  48
  49 struct eigrp_interface *eigrp_if_new(struct eigrp *eigrp, struct interface *ifp,
  50                                      struct prefix *p)
  51 {
  52         struct eigrp_interface *ei = ifp->info;
  53         int i;
  54
  55         if (ei)
  56                 return ei;
  57
  58         ei = XCALLOC(MTYPE_EIGRP_IF, sizeof(struct eigrp_interface));
  59
  60         /* Set zebra interface pointer. */
  61         ei->ifp = ifp;
  62         prefix_copy(&ei->address, p);
  63
  64         ifp->info = ei;
  65         listnode_add(eigrp->eiflist, ei);
  66
  67         ei->type = EIGRP_IFTYPE_BROADCAST;
  68
  69         /* Initialize neighbor list. */
  70         ei->nbrs = list_new();
  71
  72         ei->crypt_seqnum = frr_sequence32_next();
  73
  74         /* Initialize lists */
  75         for (i = 0; i < EIGRP_FILTER_MAX; i++) {
  76                 ei->list[i] = NULL;
  77                 ei->prefix[i] = NULL;
  78                 ei->routemap[i] = NULL;
  79         }
  80
  81         ei->eigrp = eigrp;
  82
  83         ei->params.v_hello = EIGRP_HELLO_INTERVAL_DEFAULT;
  84         ei->params.v_wait = EIGRP_HOLD_INTERVAL_DEFAULT;
  85         ei->params.bandwidth = EIGRP_BANDWIDTH_DEFAULT;
  86         ei->params.delay = EIGRP_DELAY_DEFAULT;
  87         ei->params.reliability = EIGRP_RELIABILITY_DEFAULT;
  88         ei->params.load = EIGRP_LOAD_DEFAULT;
  89         ei->params.auth_type = EIGRP_AUTH_TYPE_NONE;
  90         ei->params.auth_keychain = NULL;
  91
  92         ei->curr_bandwidth = ifp->bandwidth;
  93         ei->curr_mtu = ifp->mtu;
  94
  95         return ei;
  96 }
  97
  98 int eigrp_if_delete_hook(struct interface *ifp)
  99 {
 100         struct eigrp_interface *ei = ifp->info;
 101         struct eigrp *eigrp;
 102
 103         if (!ei)
 104                 return 0;
 105
 106         list_delete(&ei->nbrs);
 107
 108         eigrp = ei->eigrp;
 109         listnode_delete(eigrp->eiflist, ei);
 110
 111         eigrp_fifo_free(ei->obuf);
 112
 113         XFREE(MTYPE_EIGRP_IF_INFO, ifp->info);
 114
 115         return 0;
 116 }
 117
 118 static int eigrp_ifp_create(struct interface *ifp)
 119 {
 120         struct eigrp_interface *ei = ifp->info;
 121
 122         if (!ei)
 123                 return 0;
 124
 125         ei->params.type = eigrp_default_iftype(ifp);
 126
 127         eigrp_if_update(ifp);
 128
 129         return 0;
 130 }
 131
 132 static int eigrp_ifp_up(struct interface *ifp)
 133 {
 134         struct eigrp_interface *ei = ifp->info;
 135
 136         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 137                 zlog_debug("Zebra: Interface[%s] state change to up.",
 138                            ifp->name);
 139
 140         if (!ei)
 141                 return 0;
 142
 143         if (ei->curr_bandwidth != ifp->bandwidth) {
 144                 if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 145                         zlog_debug(
 146                                 "Zebra: Interface[%s] bandwidth change %d -> %d.",
 147                                 ifp->name, ei->curr_bandwidth,
 148                                 ifp->bandwidth);
 149
 150                 ei->curr_bandwidth = ifp->bandwidth;
 151                 // eigrp_if_recalculate_output_cost (ifp);
 152         }
 153
 154         if (ei->curr_mtu != ifp->mtu) {
 155                 if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 156                         zlog_debug(
 157                                 "Zebra: Interface[%s] MTU change %u -> %u.",
 158                                 ifp->name, ei->curr_mtu, ifp->mtu);
 159
 160                 ei->curr_mtu = ifp->mtu;
 161                 /* Must reset the interface (simulate down/up) when MTU
 162                  * changes. */
 163                 eigrp_if_reset(ifp);
 164                 return 0;
 165         }
 166
 167         eigrp_if_up(ifp->info);
 168
 169         return 0;
 170 }
 171
 172 static int eigrp_ifp_down(struct interface *ifp)
 173 {
 174         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 175                 zlog_debug("Zebra: Interface[%s] state change to down.",
 176                            ifp->name);
 177
 178         if (ifp->info)
 179                 eigrp_if_down(ifp->info);
 180
 181         return 0;
 182 }
 183
 184 static int eigrp_ifp_destroy(struct interface *ifp)
 185 {
 186         if (if_is_up(ifp))
 187                 zlog_warn("Zebra: got delete of %s, but interface is still up",
 188                           ifp->name);
 189
 190         if (IS_DEBUG_EIGRP(zebra, ZEBRA_INTERFACE))
 191                 zlog_debug(
 192                         "Zebra: interface delete %s index %d flags %llx metric %d mtu %d",
 193                         ifp->name, ifp->ifindex, (unsigned long long)ifp->flags,
 194                         ifp->metric, ifp->mtu);
 195
 196         if (ifp->info)
 197                 eigrp_if_free(ifp->info, INTERFACE_DOWN_BY_ZEBRA);
 198
 199         return 0;
 200 }
 201
 202 struct list *eigrp_iflist;
 203
 204 void eigrp_if_init(void)
 205 {
 206         if_zapi_callbacks(eigrp_ifp_create, eigrp_ifp_up,
 207                           eigrp_ifp_down, eigrp_ifp_destroy);
 208         /* Initialize Zebra interface data structure. */
 209         // hook_register_prio(if_add, 0, eigrp_if_new);
 210         hook_register_prio(if_del, 0, eigrp_if_delete_hook);
 211 }
 212
 213
 214 void eigrp_del_if_params(struct eigrp_if_params *eip)
 215 {
 216         if (eip->auth_keychain)
 217                 free(eip->auth_keychain);
 218 }
 219
 220 /*
 221  * Set the network byte order of the 3 bytes we send
 222  * of the mtu of the link.
 223  */
 224 static void eigrp_mtu_convert(struct eigrp_metrics *metric, uint32_t host_mtu)
 225 {
 226         uint32_t network_mtu = htonl(host_mtu);
 227         uint8_t *nm = (uint8_t *)&network_mtu;
 228
 229         metric->mtu[0] = nm[1];
 230         metric->mtu[1] = nm[2];
 231         metric->mtu[2] = nm[3];
 232 }
 233
 234 int eigrp_if_up(struct eigrp_interface *ei)
 235 {
 236         struct eigrp_prefix_descriptor *pe;
 237         struct eigrp_route_descriptor *ne;
 238         struct eigrp_metrics metric;
 239         struct eigrp_interface *ei2;
 240         struct listnode *node, *nnode;
 241         struct eigrp *eigrp;
 242
 243         if (ei == NULL)
 244                 return 0;
 245
 246         eigrp = ei->eigrp;
 247         eigrp_adjust_sndbuflen(eigrp, ei->ifp->mtu);
 248
 249         eigrp_if_stream_set(ei);
 250
 251         /* Set multicast memberships appropriately for new state. */
 252         eigrp_if_set_multicast(ei);
 253
 254         event_add_event(master, eigrp_hello_timer, ei, (1), &ei->t_hello);
 255
 256         /*Prepare metrics*/
 257         metric.bandwidth = eigrp_bandwidth_to_scaled(ei->params.bandwidth);
 258         metric.delay = eigrp_delay_to_scaled(ei->params.delay);
 259         metric.load = ei->params.load;
 260         metric.reliability = ei->params.reliability;
 261         eigrp_mtu_convert(&metric, ei->ifp->mtu);
 262         metric.hop_count = 0;
 263         metric.flags = 0;
 264         metric.tag = 0;
 265
 266         /*Add connected entry to topology table*/
 267
 268         ne = eigrp_route_descriptor_new();
 269         ne->ei = ei;
 270         ne->reported_metric = metric;
 271         ne->total_metric = metric;
 272         ne->distance = eigrp_calculate_metrics(eigrp, metric);
 273         ne->reported_distance = 0;
 274         ne->adv_router = eigrp->neighbor_self;
 275         ne->flags = EIGRP_ROUTE_DESCRIPTOR_SUCCESSOR_FLAG;
 276
 277         struct prefix dest_addr;
 278
 279         dest_addr = ei->address;
 280         apply_mask(&dest_addr);
 281         pe = eigrp_topology_table_lookup_ipv4(eigrp->topology_table,
 282                                               &dest_addr);
 283
 284         if (pe == NULL) {
 285                 pe = eigrp_prefix_descriptor_new();
 286                 pe->serno = eigrp->serno;
 287                 pe->destination = (struct prefix *)prefix_ipv4_new();
 288                 prefix_copy(pe->destination, &dest_addr);
 289                 pe->af = AF_INET;
 290                 pe->nt = EIGRP_TOPOLOGY_TYPE_CONNECTED;
 291
 292                 ne->prefix = pe;
 293                 pe->reported_metric = metric;
 294                 pe->state = EIGRP_FSM_STATE_PASSIVE;
 295                 pe->fdistance = eigrp_calculate_metrics(eigrp, metric);
 296                 pe->req_action |= EIGRP_FSM_NEED_UPDATE;
 297                 eigrp_prefix_descriptor_add(eigrp->topology_table, pe);
 298                 listnode_add(eigrp->topology_changes_internalIPV4, pe);
 299
 300                 eigrp_route_descriptor_add(eigrp, pe, ne);
 301
 302                 for (ALL_LIST_ELEMENTS(eigrp->eiflist, node, nnode, ei2)) {
 303                         eigrp_update_send(ei2);
 304                 }
 305
 306                 pe->req_action &= ~EIGRP_FSM_NEED_UPDATE;
 307                 listnode_delete(eigrp->topology_changes_internalIPV4, pe);
 308         } else {
 309                 struct eigrp_fsm_action_message msg;
 310
 311                 ne->prefix = pe;
 312                 eigrp_route_descriptor_add(eigrp, pe, ne);
 313
 314                 msg.packet_type = EIGRP_OPC_UPDATE;
 315                 msg.eigrp = eigrp;
 316                 msg.data_type = EIGRP_CONNECTED;
 317                 msg.adv_router = NULL;
 318                 msg.entry = ne;
 319                 msg.prefix = pe;
 320
 321                 eigrp_fsm_event(&msg);
 322         }
 323
 324         return 1;
 325 }
 326
 327 int eigrp_if_down(struct eigrp_interface *ei)
 328 {
 329         struct listnode *node, *nnode;
 330         struct eigrp_neighbor *nbr;
 331
 332         if (ei == NULL)
 333                 return 0;
 334
 335         /* Shutdown packet reception and sending */
 336         EVENT_OFF(ei->t_hello);
 337
 338         eigrp_if_stream_unset(ei);
 339
 340         /*Set infinite metrics to routes learned by this interface and start
 341          * query process*/
 342         for (ALL_LIST_ELEMENTS(ei->nbrs, node, nnode, nbr)) {
 343                 eigrp_nbr_delete(nbr);
 344         }
 345
 346         return 1;
 347 }
 348
 349 void eigrp_if_stream_set(struct eigrp_interface *ei)
 350 {
 351         /* set output fifo queue. */
 352         if (ei->obuf == NULL)
 353                 ei->obuf = eigrp_fifo_new();
 354 }
 355
 356 void eigrp_if_stream_unset(struct eigrp_interface *ei)
 357 {
 358         struct eigrp *eigrp = ei->eigrp;
 359
 360         if (ei->on_write_q) {
 361                 listnode_delete(eigrp->oi_write_q, ei);
 362                 if (list_isempty(eigrp->oi_write_q))
 363                         event_cancel(&(eigrp->t_write));
 364                 ei->on_write_q = 0;
 365         }
 366 }
 367
 368 bool eigrp_if_is_passive(struct eigrp_interface *ei)
 369 {
 370         if (ei->params.passive_interface == EIGRP_IF_ACTIVE)
 371                 return false;
 372
 373         if (ei->eigrp->passive_interface_default == EIGRP_IF_ACTIVE)
 374                 return false;
 375
 376         return true;
 377 }
 378
 379 void eigrp_if_set_multicast(struct eigrp_interface *ei)
 380 {
 381         if (!eigrp_if_is_passive(ei)) {
 382                 /* The interface should belong to the EIGRP-all-routers group.
 383                  */
 384                 if (!ei->member_allrouters
 385                     && (eigrp_if_add_allspfrouters(ei->eigrp, &ei->address,
 386                                                    ei->ifp->ifindex)
 387                         >= 0))
 388                         /* Set the flag only if the system call to join
 389                          * succeeded. */
 390                         ei->member_allrouters = true;
 391         } else {
 392                 /* The interface should NOT belong to the EIGRP-all-routers
 393                  * group. */
 394                 if (ei->member_allrouters) {
 395                         /* Only actually drop if this is the last reference */
 396                         eigrp_if_drop_allspfrouters(ei->eigrp, &ei->address,
 397                                                     ei->ifp->ifindex);
 398                         /* Unset the flag regardless of whether the system call
 399                            to leave
 400                            the group succeeded, since it's much safer to assume
 401                            that
 402                            we are not a member. */
 403                         ei->member_allrouters = false;
 404                 }
 405         }
 406 }
 407
 408 uint8_t eigrp_default_iftype(struct interface *ifp)
 409 {
 410         if (if_is_pointopoint(ifp))
 411                 return EIGRP_IFTYPE_POINTOPOINT;
 412         else if (if_is_loopback(ifp))
 413                 return EIGRP_IFTYPE_LOOPBACK;
 414         else
 415                 return EIGRP_IFTYPE_BROADCAST;
 416 }
 417
 418 void eigrp_if_free(struct eigrp_interface *ei, int source)
 419 {
 420         struct prefix dest_addr;
 421         struct eigrp_prefix_descriptor *pe;
 422         struct eigrp *eigrp = ei->eigrp;
 423
 424         if (source == INTERFACE_DOWN_BY_VTY) {
 425                 event_cancel(&ei->t_hello);
 426                 eigrp_hello_send(ei, EIGRP_HELLO_GRACEFUL_SHUTDOWN, NULL);
 427         }
 428
 429         dest_addr = ei->address;
 430         apply_mask(&dest_addr);
 431         pe = eigrp_topology_table_lookup_ipv4(eigrp->topology_table,
 432                                               &dest_addr);
 433         if (pe)
 434                 eigrp_prefix_descriptor_delete(eigrp, eigrp->topology_table,
 435                                                pe);
 436
 437         eigrp_if_down(ei);
 438
 439         listnode_delete(ei->eigrp->eiflist, ei);
 440 }
 441
 442 /* Simulate down/up on the interface.  This is needed, for example, when
 443    the MTU changes. */
 444 void eigrp_if_reset(struct interface *ifp)
 445 {
 446         struct eigrp_interface *ei = ifp->info;
 447
 448         if (!ei)
 449                 return;
 450
 451         eigrp_if_down(ei);
 452         eigrp_if_up(ei);
 453 }
 454
 455 struct eigrp_interface *eigrp_if_lookup_by_local_addr(struct eigrp *eigrp,
 456                                                       struct interface *ifp,
 457                                                       struct in_addr address)
 458 {
 459         struct listnode *node;
 460         struct eigrp_interface *ei;
 461
 462         for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) {
 463                 if (ifp && ei->ifp != ifp)
 464                         continue;
 465
 466                 if (IPV4_ADDR_SAME(&address, &ei->address.u.prefix4))
 467                         return ei;
 468         }
 469
 470         return NULL;
 471 }
 472
 473 /**
 474  * @fn eigrp_if_lookup_by_name
 475  *
 476  * @param[in]           eigrp           EIGRP process
 477  * @param[in]           if_name         Name of the interface
 478  *
 479  * @return struct eigrp_interface *
 480  *
 481  * @par
 482  * Function is used for lookup interface by name.
 483  */
 484 struct eigrp_interface *eigrp_if_lookup_by_name(struct eigrp *eigrp,
 485                                                 const char *if_name)
 486 {
 487         struct eigrp_interface *ei;
 488         struct listnode *node;
 489
 490         /* iterate over all eigrp interfaces */
 491         for (ALL_LIST_ELEMENTS_RO(eigrp->eiflist, node, ei)) {
 492                 /* compare int name with eigrp interface's name */
 493                 if (strcmp(ei->ifp->name, if_name) == 0) {
 494                         return ei;
 495                 }
 496         }
 497
 498         return NULL;
 499 }