isisd/isis_adjacency.c

   1 /*
   2  * IS-IS Rout(e)ing protocol - isis_adjacency.c
   3  *                             handling of IS-IS adjacencies
   4  *
   5  * Copyright (C) 2001,2002   Sampo Saaristo
   6  *                           Tampere University of Technology
   7  *                           Institute of Communications Engineering
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public Licenseas published by the Free
  11  * Software Foundation; either version 2 of the License, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; see the file COPYING; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <zebra.h>
  25
  26 #include "log.h"
  27 #include "memory.h"
  28 #include "hash.h"
  29 #include "vty.h"
  30 #include "linklist.h"
  31 #include "thread.h"
  32 #include "if.h"
  33 #include "stream.h"
  34
  35 #include "isisd/dict.h"
  36 #include "isisd/isis_constants.h"
  37 #include "isisd/isis_common.h"
  38 #include "isisd/isis_flags.h"
  39 #include "isisd/isisd.h"
  40 #include "isisd/isis_circuit.h"
  41 #include "isisd/isis_adjacency.h"
  42 #include "isisd/isis_misc.h"
  43 #include "isisd/isis_dr.h"
  44 #include "isisd/isis_dynhn.h"
  45 #include "isisd/isis_pdu.h"
  46 #include "isisd/isis_lsp.h"
  47 #include "isisd/isis_spf.h"
  48 #include "isisd/isis_events.h"
  49 #include "isisd/isis_mt.h"
  50 #include "isisd/isis_tlvs.h"
  51 #include "isisd/fabricd.h"
  52
  53 extern struct isis *isis;
  54
  55 static struct isis_adjacency *adj_alloc(const uint8_t *id)
  56 {
  57         struct isis_adjacency *adj;
  58
  59         adj = XCALLOC(MTYPE_ISIS_ADJACENCY, sizeof(struct isis_adjacency));
  60         memcpy(adj->sysid, id, ISIS_SYS_ID_LEN);
  61
  62         return adj;
  63 }
  64
  65 struct isis_adjacency *isis_new_adj(const uint8_t *id, const uint8_t *snpa,
  66                                     int level, struct isis_circuit *circuit)
  67 {
  68         struct isis_adjacency *adj;
  69         int i;
  70
  71         adj = adj_alloc(id); /* P2P kludge */
  72
  73         if (snpa) {
  74                 memcpy(adj->snpa, snpa, ETH_ALEN);
  75         } else {
  76                 memset(adj->snpa, ' ', ETH_ALEN);
  77         }
  78
  79         adj->circuit = circuit;
  80         adj->level = level;
  81         adj->flaps = 0;
  82         adj->last_flap = time(NULL);
  83         adj->threeway_state = ISIS_THREEWAY_DOWN;
  84         if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
  85                 listnode_add(circuit->u.bc.adjdb[level - 1], adj);
  86                 adj->dischanges[level - 1] = 0;
  87                 for (i = 0; i < DIS_RECORDS;
  88                      i++) /* clear N DIS state change records */
  89                 {
  90                         adj->dis_record[(i * ISIS_LEVELS) + level - 1].dis =
  91                                 ISIS_UNKNOWN_DIS;
  92                         adj->dis_record[(i * ISIS_LEVELS) + level - 1]
  93                                 .last_dis_change = time(NULL);
  94                 }
  95         }
  96
  97         return adj;
  98 }
  99
 100 struct isis_adjacency *isis_adj_lookup(const uint8_t *sysid, struct list *adjdb)
 101 {
 102         struct isis_adjacency *adj;
 103         struct listnode *node;
 104
 105         for (ALL_LIST_ELEMENTS_RO(adjdb, node, adj))
 106                 if (memcmp(adj->sysid, sysid, ISIS_SYS_ID_LEN) == 0)
 107                         return adj;
 108
 109         return NULL;
 110 }
 111
 112 struct isis_adjacency *isis_adj_lookup_snpa(const uint8_t *ssnpa,
 113                                             struct list *adjdb)
 114 {
 115         struct listnode *node;
 116         struct isis_adjacency *adj;
 117
 118         for (ALL_LIST_ELEMENTS_RO(adjdb, node, adj))
 119                 if (memcmp(adj->snpa, ssnpa, ETH_ALEN) == 0)
 120                         return adj;
 121
 122         return NULL;
 123 }
 124
 125 DEFINE_HOOK(isis_adj_state_change_hook, (struct isis_adjacency *adj), (adj))
 126
 127 void isis_delete_adj(void *arg)
 128 {
 129         struct isis_adjacency *adj = arg;
 130
 131         if (!adj)
 132                 return;
 133
 134         THREAD_TIMER_OFF(adj->t_expire);
 135         if (adj->adj_state != ISIS_ADJ_DOWN) {
 136                 adj->adj_state = ISIS_ADJ_DOWN;
 137                 hook_call(isis_adj_state_change_hook, adj);
 138         }
 139
 140         /* remove from SPF trees */
 141         spftree_area_adj_del(adj->circuit->area, adj);
 142
 143         if (adj->area_addresses)
 144                 XFREE(MTYPE_ISIS_ADJACENCY_INFO, adj->area_addresses);
 145         if (adj->ipv4_addresses)
 146                 XFREE(MTYPE_ISIS_ADJACENCY_INFO, adj->ipv4_addresses);
 147         if (adj->ipv6_addresses)
 148                 XFREE(MTYPE_ISIS_ADJACENCY_INFO, adj->ipv6_addresses);
 149
 150         adj_mt_finish(adj);
 151
 152         XFREE(MTYPE_ISIS_ADJACENCY, adj);
 153         return;
 154 }
 155
 156 static const char *adj_state2string(int state)
 157 {
 158
 159         switch (state) {
 160         case ISIS_ADJ_INITIALIZING:
 161                 return "Initializing";
 162         case ISIS_ADJ_UP:
 163                 return "Up";
 164         case ISIS_ADJ_DOWN:
 165                 return "Down";
 166         default:
 167                 return "Unknown";
 168         }
 169
 170         return NULL; /* not reached */
 171 }
 172
 173 void isis_adj_process_threeway(struct isis_adjacency *adj,
 174                                struct isis_threeway_adj *tw_adj,
 175                                enum isis_adj_usage adj_usage)
 176 {
 177         enum isis_threeway_state next_tw_state = ISIS_THREEWAY_DOWN;
 178
 179         if (tw_adj && !adj->circuit->disable_threeway_adj) {
 180                 if (tw_adj->state == ISIS_THREEWAY_DOWN) {
 181                         next_tw_state = ISIS_THREEWAY_INITIALIZING;
 182                 } else if (tw_adj->state == ISIS_THREEWAY_INITIALIZING) {
 183                         next_tw_state = ISIS_THREEWAY_UP;
 184                 } else if (tw_adj->state == ISIS_THREEWAY_UP) {
 185                         if (adj->threeway_state == ISIS_THREEWAY_DOWN)
 186                                 next_tw_state = ISIS_THREEWAY_DOWN;
 187                         else
 188                                 next_tw_state = ISIS_THREEWAY_UP;
 189                 }
 190         } else {
 191                 next_tw_state = ISIS_THREEWAY_UP;
 192         }
 193
 194         if (next_tw_state != adj->threeway_state) {
 195                 if (isis->debugs & DEBUG_ADJ_PACKETS) {
 196                         zlog_info("ISIS-Adj (%s): Threeway state change %s to %s",
 197                                   adj->circuit->area->area_tag,
 198                                   isis_threeway_state_name(adj->threeway_state),
 199                                   isis_threeway_state_name(next_tw_state));
 200                 }
 201         }
 202
 203         if (next_tw_state != ISIS_THREEWAY_DOWN)
 204                 fabricd_initial_sync_hello(adj->circuit);
 205
 206         if (next_tw_state == ISIS_THREEWAY_DOWN) {
 207                 isis_adj_state_change(adj, ISIS_ADJ_DOWN, "Neighbor restarted");
 208                 return;
 209         }
 210
 211         if (next_tw_state == ISIS_THREEWAY_UP) {
 212                 if (adj->adj_state != ISIS_ADJ_UP) {
 213                         isis_adj_state_change(adj, ISIS_ADJ_UP, NULL);
 214                         adj->adj_usage = adj_usage;
 215                 }
 216         }
 217
 218         if (adj->threeway_state != next_tw_state) {
 219                 send_hello_sched(adj->circuit, 0, TRIGGERED_IIH_DELAY);
 220         }
 221
 222         adj->threeway_state = next_tw_state;
 223 }
 224
 225 void isis_adj_state_change(struct isis_adjacency *adj,
 226                            enum isis_adj_state new_state, const char *reason)
 227 {
 228         enum isis_adj_state old_state = adj->adj_state;
 229         struct isis_circuit *circuit = adj->circuit;
 230         bool del;
 231
 232         adj->adj_state = new_state;
 233         if (new_state != old_state) {
 234                 send_hello_sched(circuit, adj->level, TRIGGERED_IIH_DELAY);
 235         }
 236
 237         if (isis->debugs & DEBUG_ADJ_PACKETS) {
 238                 zlog_debug("ISIS-Adj (%s): Adjacency state change %d->%d: %s",
 239                            circuit->area->area_tag, old_state, new_state,
 240                            reason ? reason : "unspecified");
 241         }
 242
 243         if (circuit->area->log_adj_changes) {
 244                 const char *adj_name;
 245                 struct isis_dynhn *dyn;
 246
 247                 dyn = dynhn_find_by_id(adj->sysid);
 248                 if (dyn)
 249                         adj_name = dyn->hostname;
 250                 else
 251                         adj_name = sysid_print(adj->sysid);
 252
 253                 zlog_info(
 254                         "%%ADJCHANGE: Adjacency to %s (%s) changed from %s to %s, %s",
 255                         adj_name, adj->circuit->interface->name,
 256                         adj_state2string(old_state),
 257                         adj_state2string(new_state),
 258                         reason ? reason : "unspecified");
 259         }
 260
 261         if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
 262                 del = false;
 263                 for (int level = IS_LEVEL_1; level <= IS_LEVEL_2; level++) {
 264                         if ((adj->level & level) == 0)
 265                                 continue;
 266                         if (new_state == ISIS_ADJ_UP) {
 267                                 circuit->upadjcount[level - 1]++;
 268                                 hook_call(isis_adj_state_change_hook, adj);
 269                                 /* update counter & timers for debugging
 270                                  * purposes */
 271                                 adj->last_flap = time(NULL);
 272                                 adj->flaps++;
 273                         } else if (new_state == ISIS_ADJ_DOWN) {
 274                                 listnode_delete(circuit->u.bc.adjdb[level - 1],
 275                                                 adj);
 276
 277                                 circuit->upadjcount[level - 1]--;
 278                                 if (circuit->upadjcount[level - 1] == 0)
 279                                         isis_tx_queue_clean(circuit->tx_queue);
 280
 281                                 hook_call(isis_adj_state_change_hook, adj);
 282                                 del = true;
 283                         }
 284
 285                         if (circuit->u.bc.lan_neighs[level - 1]) {
 286                                 list_delete_all_node(
 287                                         circuit->u.bc.lan_neighs[level - 1]);
 288                                 isis_adj_build_neigh_list(
 289                                         circuit->u.bc.adjdb[level - 1],
 290                                         circuit->u.bc.lan_neighs[level - 1]);
 291                         }
 292
 293                         /* On adjacency state change send new pseudo LSP if we
 294                          * are the DR */
 295                         if (circuit->u.bc.is_dr[level - 1])
 296                                 lsp_regenerate_schedule_pseudo(circuit, level);
 297                 }
 298
 299                 if (del)
 300                         isis_delete_adj(adj);
 301
 302         } else if (circuit->circ_type == CIRCUIT_T_P2P) {
 303                 del = false;
 304                 for (int level = IS_LEVEL_1; level <= IS_LEVEL_2; level++) {
 305                         if ((adj->level & level) == 0)
 306                                 continue;
 307                         if (new_state == ISIS_ADJ_UP) {
 308                                 circuit->upadjcount[level - 1]++;
 309                                 hook_call(isis_adj_state_change_hook, adj);
 310
 311                                 /* update counter & timers for debugging
 312                                  * purposes */
 313                                 adj->last_flap = time(NULL);
 314                                 adj->flaps++;
 315
 316                                 if (level == IS_LEVEL_1) {
 317                                         thread_add_timer(master, send_l1_csnp,
 318                                                          circuit, 0,
 319                                                          &circuit->t_send_csnp[0]);
 320                                 } else {
 321                                         thread_add_timer(master, send_l2_csnp,
 322                                                          circuit, 0,
 323                                                          &circuit->t_send_csnp[1]);
 324                                 }
 325                         } else if (new_state == ISIS_ADJ_DOWN) {
 326                                 if (adj->circuit->u.p2p.neighbor == adj)
 327                                         adj->circuit->u.p2p.neighbor = NULL;
 328                                 circuit->upadjcount[level - 1]--;
 329                                 if (circuit->upadjcount[level - 1] == 0)
 330                                         isis_tx_queue_clean(circuit->tx_queue);
 331
 332                                 hook_call(isis_adj_state_change_hook, adj);
 333                                 del = true;
 334                         }
 335                 }
 336
 337                 if (del)
 338                         isis_delete_adj(adj);
 339         }
 340 }
 341
 342
 343 void isis_adj_print(struct isis_adjacency *adj)
 344 {
 345         struct isis_dynhn *dyn;
 346
 347         if (!adj)
 348                 return;
 349         dyn = dynhn_find_by_id(adj->sysid);
 350         if (dyn)
 351                 zlog_debug("%s", dyn->hostname);
 352
 353         zlog_debug("SystemId %20s SNPA %s, level %d\nHolding Time %d",
 354                    sysid_print(adj->sysid), snpa_print(adj->snpa), adj->level,
 355                    adj->hold_time);
 356         if (adj->ipv4_address_count) {
 357                 zlog_debug("IPv4 Address(es):");
 358                 for (unsigned int i = 0; i < adj->ipv4_address_count; i++)
 359                         zlog_debug("%s", inet_ntoa(adj->ipv4_addresses[i]));
 360         }
 361
 362         if (adj->ipv6_address_count) {
 363                 zlog_debug("IPv6 Address(es):");
 364                 for (unsigned int i = 0; i < adj->ipv6_address_count; i++) {
 365                         char buf[INET6_ADDRSTRLEN];
 366                         inet_ntop(AF_INET6, &adj->ipv6_addresses[i], buf,
 367                                   sizeof(buf));
 368                         zlog_debug("%s", buf);
 369                 }
 370         }
 371         zlog_debug("Speaks: %s", nlpid2string(&adj->nlpids));
 372
 373         return;
 374 }
 375
 376 int isis_adj_expire(struct thread *thread)
 377 {
 378         struct isis_adjacency *adj;
 379
 380         /*
 381          * Get the adjacency
 382          */
 383         adj = THREAD_ARG(thread);
 384         assert(adj);
 385         adj->t_expire = NULL;
 386
 387         /* trigger the adj expire event */
 388         isis_adj_state_change(adj, ISIS_ADJ_DOWN, "holding time expired");
 389
 390         return 0;
 391 }
 392
 393 /*
 394  * show isis neighbor [detail]
 395  */
 396 void isis_adj_print_vty(struct isis_adjacency *adj, struct vty *vty,
 397                         char detail)
 398 {
 399         time_t now;
 400         struct isis_dynhn *dyn;
 401         int level;
 402
 403         dyn = dynhn_find_by_id(adj->sysid);
 404         if (dyn)
 405                 vty_out(vty, "  %-20s", dyn->hostname);
 406         else
 407                 vty_out(vty, "  %-20s", sysid_print(adj->sysid));
 408
 409         if (detail == ISIS_UI_LEVEL_BRIEF) {
 410                 if (adj->circuit)
 411                         vty_out(vty, "%-12s", adj->circuit->interface->name);
 412                 else
 413                         vty_out(vty, "NULL circuit!");
 414                 vty_out(vty, "%-3u", adj->level); /* level */
 415                 vty_out(vty, "%-13s", adj_state2string(adj->adj_state));
 416                 now = time(NULL);
 417                 if (adj->last_upd)
 418                         vty_out(vty, "%-9llu",
 419                                 (unsigned long long)adj->last_upd
 420                                         + adj->hold_time - now);
 421                 else
 422                         vty_out(vty, "-        ");
 423                 vty_out(vty, "%-10s", snpa_print(adj->snpa));
 424                 vty_out(vty, "\n");
 425         }
 426
 427         if (detail == ISIS_UI_LEVEL_DETAIL) {
 428                 level = adj->level;
 429                 vty_out(vty, "\n");
 430                 if (adj->circuit)
 431                         vty_out(vty, "    Interface: %s",
 432                                 adj->circuit->interface->name);
 433                 else
 434                         vty_out(vty, "    Interface: NULL circuit");
 435                 vty_out(vty, ", Level: %u", adj->level); /* level */
 436                 vty_out(vty, ", State: %s", adj_state2string(adj->adj_state));
 437                 now = time(NULL);
 438                 if (adj->last_upd)
 439                         vty_out(vty, ", Expires in %s",
 440                                 time2string(adj->last_upd + adj->hold_time
 441                                             - now));
 442                 else
 443                         vty_out(vty, ", Expires in %s",
 444                                 time2string(adj->hold_time));
 445                 vty_out(vty, "\n");
 446                 vty_out(vty, "    Adjacency flaps: %u", adj->flaps);
 447                 vty_out(vty, ", Last: %s ago",
 448                         time2string(now - adj->last_flap));
 449                 vty_out(vty, "\n");
 450                 vty_out(vty, "    Circuit type: %s",
 451                         circuit_t2string(adj->circuit_t));
 452                 vty_out(vty, ", Speaks: %s", nlpid2string(&adj->nlpids));
 453                 vty_out(vty, "\n");
 454                 if (adj->mt_count != 1
 455                     || adj->mt_set[0] != ISIS_MT_IPV4_UNICAST) {
 456                         vty_out(vty, "    Topologies:\n");
 457                         for (unsigned int i = 0; i < adj->mt_count; i++)
 458                                 vty_out(vty, "      %s\n",
 459                                         isis_mtid2str(adj->mt_set[i]));
 460                 }
 461                 vty_out(vty, "    SNPA: %s", snpa_print(adj->snpa));
 462                 if (adj->circuit
 463                     && (adj->circuit->circ_type == CIRCUIT_T_BROADCAST)) {
 464                         dyn = dynhn_find_by_id(adj->lanid);
 465                         if (dyn)
 466                                 vty_out(vty, ", LAN id: %s.%02x", dyn->hostname,
 467                                         adj->lanid[ISIS_SYS_ID_LEN]);
 468                         else
 469                                 vty_out(vty, ", LAN id: %s.%02x",
 470                                         sysid_print(adj->lanid),
 471                                         adj->lanid[ISIS_SYS_ID_LEN]);
 472
 473                         vty_out(vty, "\n");
 474                         vty_out(vty, "    LAN Priority: %u",
 475                                 adj->prio[adj->level - 1]);
 476
 477                         vty_out(vty, ", %s, DIS flaps: %u, Last: %s ago",
 478                                 isis_disflag2string(
 479                                         adj->dis_record[ISIS_LEVELS + level - 1]
 480                                                 .dis),
 481                                 adj->dischanges[level - 1],
 482                                 time2string(now - (adj->dis_record[ISIS_LEVELS
 483                                                                    + level - 1]
 484                                                            .last_dis_change)));
 485                 }
 486                 vty_out(vty, "\n");
 487
 488                 if (adj->area_address_count) {
 489                         vty_out(vty, "    Area Address(es):\n");
 490                         for (unsigned int i = 0; i < adj->area_address_count;
 491                              i++) {
 492                                 vty_out(vty, "      %s\n",
 493                                         isonet_print(adj->area_addresses[i]
 494                                                              .area_addr,
 495                                                      adj->area_addresses[i]
 496                                                              .addr_len));
 497                         }
 498                 }
 499                 if (adj->ipv4_address_count) {
 500                         vty_out(vty, "    IPv4 Address(es):\n");
 501                         for (unsigned int i = 0; i < adj->ipv4_address_count;
 502                              i++)
 503                                 vty_out(vty, "      %s\n",
 504                                         inet_ntoa(adj->ipv4_addresses[i]));
 505                 }
 506                 if (adj->ipv6_address_count) {
 507                         vty_out(vty, "    IPv6 Address(es):\n");
 508                         for (unsigned int i = 0; i < adj->ipv6_address_count;
 509                              i++) {
 510                                 char buf[INET6_ADDRSTRLEN];
 511                                 inet_ntop(AF_INET6, &adj->ipv6_addresses[i],
 512                                           buf, sizeof(buf));
 513                                 vty_out(vty, "      %s\n", buf);
 514                         }
 515                 }
 516                 vty_out(vty, "\n");
 517         }
 518         return;
 519 }
 520
 521 void isis_adj_build_neigh_list(struct list *adjdb, struct list *list)
 522 {
 523         struct isis_adjacency *adj;
 524         struct listnode *node;
 525
 526         if (!list) {
 527                 zlog_warn("isis_adj_build_neigh_list(): NULL list");
 528                 return;
 529         }
 530
 531         for (ALL_LIST_ELEMENTS_RO(adjdb, node, adj)) {
 532                 if (!adj) {
 533                         zlog_warn("isis_adj_build_neigh_list(): NULL adj");
 534                         return;
 535                 }
 536
 537                 if ((adj->adj_state == ISIS_ADJ_UP
 538                      || adj->adj_state == ISIS_ADJ_INITIALIZING))
 539                         listnode_add(list, adj->snpa);
 540         }
 541         return;
 542 }
 543
 544 void isis_adj_build_up_list(struct list *adjdb, struct list *list)
 545 {
 546         struct isis_adjacency *adj;
 547         struct listnode *node;
 548
 549         if (adjdb == NULL) {
 550                 zlog_warn("isis_adj_build_up_list(): adjacency DB is empty");
 551                 return;
 552         }
 553
 554         if (!list) {
 555                 zlog_warn("isis_adj_build_up_list(): NULL list");
 556                 return;
 557         }
 558
 559         for (ALL_LIST_ELEMENTS_RO(adjdb, node, adj)) {
 560                 if (!adj) {
 561                         zlog_warn("isis_adj_build_up_list(): NULL adj");
 562                         return;
 563                 }
 564
 565                 if (adj->adj_state == ISIS_ADJ_UP)
 566                         listnode_add(list, adj);
 567         }
 568
 569         return;
 570 }
 571
 572 int isis_adj_usage2levels(enum isis_adj_usage usage)
 573 {
 574         switch (usage) {
 575         case ISIS_ADJ_LEVEL1:
 576                 return IS_LEVEL_1;
 577         case ISIS_ADJ_LEVEL2:
 578                 return IS_LEVEL_2;
 579         case ISIS_ADJ_LEVEL1AND2:
 580                 return IS_LEVEL_1 | IS_LEVEL_2;
 581         default:
 582                 break;
 583         }
 584         return 0;
 585 }