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
  52 extern struct isis *isis;
  53
  54 static struct isis_adjacency *adj_alloc(const uint8_t *id)
  55 {
  56         struct isis_adjacency *adj;
  57
  58         adj = XCALLOC(MTYPE_ISIS_ADJACENCY, sizeof(struct isis_adjacency));
  59         memcpy(adj->sysid, id, ISIS_SYS_ID_LEN);
  60
  61         return adj;
  62 }
  63
  64 struct isis_adjacency *isis_new_adj(const uint8_t *id, const uint8_t *snpa,
  65                                     int level, struct isis_circuit *circuit)
  66 {
  67         struct isis_adjacency *adj;
  68         int i;
  69
  70         adj = adj_alloc(id); /* P2P kludge */
  71
  72         if (snpa) {
  73                 memcpy(adj->snpa, snpa, ETH_ALEN);
  74         } else {
  75                 memset(adj->snpa, ' ', ETH_ALEN);
  76         }
  77
  78         adj->circuit = circuit;
  79         adj->level = level;
  80         adj->flaps = 0;
  81         adj->last_flap = time(NULL);
  82         adj->threeway_state = ISIS_THREEWAY_DOWN;
  83         if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
  84                 listnode_add(circuit->u.bc.adjdb[level - 1], adj);
  85                 adj->dischanges[level - 1] = 0;
  86                 for (i = 0; i < DIS_RECORDS;
  87                      i++) /* clear N DIS state change records */
  88                 {
  89                         adj->dis_record[(i * ISIS_LEVELS) + level - 1].dis =
  90                                 ISIS_UNKNOWN_DIS;
  91                         adj->dis_record[(i * ISIS_LEVELS) + level - 1]
  92                                 .last_dis_change = time(NULL);
  93                 }
  94         }
  95
  96         return adj;
  97 }
  98
  99 struct isis_adjacency *isis_adj_lookup(const uint8_t *sysid, struct list *adjdb)
 100 {
 101         struct isis_adjacency *adj;
 102         struct listnode *node;
 103
 104         for (ALL_LIST_ELEMENTS_RO(adjdb, node, adj))
 105                 if (memcmp(adj->sysid, sysid, ISIS_SYS_ID_LEN) == 0)
 106                         return adj;
 107
 108         return NULL;
 109 }
 110
 111 struct isis_adjacency *isis_adj_lookup_snpa(const uint8_t *ssnpa,
 112                                             struct list *adjdb)
 113 {
 114         struct listnode *node;
 115         struct isis_adjacency *adj;
 116
 117         for (ALL_LIST_ELEMENTS_RO(adjdb, node, adj))
 118                 if (memcmp(adj->snpa, ssnpa, ETH_ALEN) == 0)
 119                         return adj;
 120
 121         return NULL;
 122 }
 123
 124 void isis_delete_adj(void *arg)
 125 {
 126         struct isis_adjacency *adj = arg;
 127
 128         if (!adj)
 129                 return;
 130
 131         THREAD_TIMER_OFF(adj->t_expire);
 132
 133         /* remove from SPF trees */
 134         spftree_area_adj_del(adj->circuit->area, adj);
 135
 136         if (adj->area_addresses)
 137                 XFREE(MTYPE_ISIS_ADJACENCY_INFO, adj->area_addresses);
 138         if (adj->ipv4_addresses)
 139                 XFREE(MTYPE_ISIS_ADJACENCY_INFO, adj->ipv4_addresses);
 140         if (adj->ipv6_addresses)
 141                 XFREE(MTYPE_ISIS_ADJACENCY_INFO, adj->ipv6_addresses);
 142
 143         adj_mt_finish(adj);
 144
 145         XFREE(MTYPE_ISIS_ADJACENCY, adj);
 146         return;
 147 }
 148
 149 static const char *adj_state2string(int state)
 150 {
 151
 152         switch (state) {
 153         case ISIS_ADJ_INITIALIZING:
 154                 return "Initializing";
 155         case ISIS_ADJ_UP:
 156                 return "Up";
 157         case ISIS_ADJ_DOWN:
 158                 return "Down";
 159         default:
 160                 return "Unknown";
 161         }
 162
 163         return NULL; /* not reached */
 164 }
 165
 166 void isis_adj_process_threeway(struct isis_adjacency *adj,
 167                                struct isis_threeway_adj *tw_adj,
 168                                enum isis_adj_usage adj_usage)
 169 {
 170         enum isis_threeway_state next_tw_state = ISIS_THREEWAY_DOWN;
 171
 172         if (tw_adj && !adj->circuit->disable_threeway_adj) {
 173                 if (tw_adj->state == ISIS_THREEWAY_DOWN) {
 174                         next_tw_state = ISIS_THREEWAY_INITIALIZING;
 175                 } else if (tw_adj->state == ISIS_THREEWAY_INITIALIZING) {
 176                         next_tw_state = ISIS_THREEWAY_UP;
 177                 } else if (tw_adj->state == ISIS_THREEWAY_UP) {
 178                         if (adj->threeway_state == ISIS_THREEWAY_DOWN)
 179                                 next_tw_state = ISIS_THREEWAY_DOWN;
 180                         else
 181                                 next_tw_state = ISIS_THREEWAY_UP;
 182                 }
 183         } else {
 184                 next_tw_state = ISIS_THREEWAY_UP;
 185         }
 186
 187         if (next_tw_state != adj->threeway_state) {
 188                 if (isis->debugs & DEBUG_ADJ_PACKETS) {
 189                         zlog_info("ISIS-Adj (%s): Threeway state change %s to %s",
 190                                   adj->circuit->area->area_tag,
 191                                   isis_threeway_state_name(adj->threeway_state),
 192                                   isis_threeway_state_name(next_tw_state));
 193                 }
 194         }
 195
 196         if (next_tw_state == ISIS_THREEWAY_DOWN) {
 197                 isis_adj_state_change(adj, ISIS_ADJ_DOWN, "Neighbor restarted");
 198                 return;
 199         }
 200
 201         if (next_tw_state == ISIS_THREEWAY_UP) {
 202                 if (adj->adj_state != ISIS_ADJ_UP) {
 203                         isis_adj_state_change(adj, ISIS_ADJ_UP, NULL);
 204                         adj->adj_usage = adj_usage;
 205                 }
 206         }
 207
 208         adj->threeway_state = next_tw_state;
 209 }
 210
 211 void isis_adj_state_change(struct isis_adjacency *adj,
 212                            enum isis_adj_state new_state, const char *reason)
 213 {
 214         int old_state;
 215         int level;
 216         struct isis_circuit *circuit;
 217         bool del;
 218
 219         old_state = adj->adj_state;
 220         adj->adj_state = new_state;
 221
 222         circuit = adj->circuit;
 223
 224         if (isis->debugs & DEBUG_ADJ_PACKETS) {
 225                 zlog_debug("ISIS-Adj (%s): Adjacency state change %d->%d: %s",
 226                            circuit->area->area_tag, old_state, new_state,
 227                            reason ? reason : "unspecified");
 228         }
 229
 230         if (circuit->area->log_adj_changes) {
 231                 const char *adj_name;
 232                 struct isis_dynhn *dyn;
 233
 234                 dyn = dynhn_find_by_id(adj->sysid);
 235                 if (dyn)
 236                         adj_name = dyn->hostname;
 237                 else
 238                         adj_name = sysid_print(adj->sysid);
 239
 240                 zlog_info(
 241                         "%%ADJCHANGE: Adjacency to %s (%s) changed from %s to %s, %s",
 242                         adj_name, adj->circuit->interface->name,
 243                         adj_state2string(old_state),
 244                         adj_state2string(new_state),
 245                         reason ? reason : "unspecified");
 246         }
 247
 248         if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
 249                 del = false;
 250                 for (level = IS_LEVEL_1; level <= IS_LEVEL_2; level++) {
 251                         if ((adj->level & level) == 0)
 252                                 continue;
 253                         if (new_state == ISIS_ADJ_UP) {
 254                                 circuit->upadjcount[level - 1]++;
 255                                 isis_event_adjacency_state_change(adj,
 256                                                                   new_state);
 257                                 /* update counter & timers for debugging
 258                                  * purposes */
 259                                 adj->last_flap = time(NULL);
 260                                 adj->flaps++;
 261                         } else if (new_state == ISIS_ADJ_DOWN) {
 262                                 listnode_delete(circuit->u.bc.adjdb[level - 1],
 263                                                 adj);
 264
 265                                 circuit->upadjcount[level - 1]--;
 266                                 if (circuit->upadjcount[level - 1] == 0)
 267                                         isis_circuit_lsp_queue_clean(circuit);
 268
 269                                 isis_event_adjacency_state_change(adj,
 270                                                                   new_state);
 271                                 del = true;
 272                         }
 273
 274                         if (circuit->u.bc.lan_neighs[level - 1]) {
 275                                 list_delete_all_node(
 276                                         circuit->u.bc.lan_neighs[level - 1]);
 277                                 isis_adj_build_neigh_list(
 278                                         circuit->u.bc.adjdb[level - 1],
 279                                         circuit->u.bc.lan_neighs[level - 1]);
 280                         }
 281
 282                         /* On adjacency state change send new pseudo LSP if we
 283                          * are the DR */
 284                         if (circuit->u.bc.is_dr[level - 1])
 285                                 lsp_regenerate_schedule_pseudo(circuit, level);
 286                 }
 287
 288                 if (del)
 289                         isis_delete_adj(adj);
 290
 291                 adj = NULL;
 292         } else if (circuit->circ_type == CIRCUIT_T_P2P) {
 293                 del = false;
 294                 for (level = IS_LEVEL_1; level <= IS_LEVEL_2; level++) {
 295                         if ((adj->level & level) == 0)
 296                                 continue;
 297                         if (new_state == ISIS_ADJ_UP) {
 298                                 circuit->upadjcount[level - 1]++;
 299                                 isis_event_adjacency_state_change(adj,
 300                                                                   new_state);
 301
 302                                 if (adj->sys_type == ISIS_SYSTYPE_UNKNOWN)
 303                                         send_hello(circuit, level);
 304
 305                                 /* update counter & timers for debugging
 306                                  * purposes */
 307                                 adj->last_flap = time(NULL);
 308                                 adj->flaps++;
 309
 310                                 /* 7.3.17 - going up on P2P -> send CSNP */
 311                                 /* FIXME: yup, I know its wrong... but i will do
 312                                  * it! (for now) */
 313                                 send_csnp(circuit, level);
 314                         } else if (new_state == ISIS_ADJ_DOWN) {
 315                                 if (adj->circuit->u.p2p.neighbor == adj)
 316                                         adj->circuit->u.p2p.neighbor = NULL;
 317                                 circuit->upadjcount[level - 1]--;
 318                                 if (circuit->upadjcount[level - 1] == 0)
 319                                         isis_circuit_lsp_queue_clean(circuit);
 320
 321                                 isis_event_adjacency_state_change(adj,
 322                                                                   new_state);
 323                                 del = true;
 324                         }
 325                 }
 326
 327                 if (del)
 328                         isis_delete_adj(adj);
 329
 330                 adj = NULL;
 331         }
 332
 333         return;
 334 }
 335
 336
 337 void isis_adj_print(struct isis_adjacency *adj)
 338 {
 339         struct isis_dynhn *dyn;
 340
 341         if (!adj)
 342                 return;
 343         dyn = dynhn_find_by_id(adj->sysid);
 344         if (dyn)
 345                 zlog_debug("%s", dyn->hostname);
 346
 347         zlog_debug("SystemId %20s SNPA %s, level %d\nHolding Time %d",
 348                    sysid_print(adj->sysid), snpa_print(adj->snpa), adj->level,
 349                    adj->hold_time);
 350         if (adj->ipv4_address_count) {
 351                 zlog_debug("IPv4 Address(es):");
 352                 for (unsigned int i = 0; i < adj->ipv4_address_count; i++)
 353                         zlog_debug("%s", inet_ntoa(adj->ipv4_addresses[i]));
 354         }
 355
 356         if (adj->ipv6_address_count) {
 357                 zlog_debug("IPv6 Address(es):");
 358                 for (unsigned int i = 0; i < adj->ipv6_address_count; i++) {
 359                         char buf[INET6_ADDRSTRLEN];
 360                         inet_ntop(AF_INET6, &adj->ipv6_addresses[i], buf,
 361                                   sizeof(buf));
 362                         zlog_debug("%s", buf);
 363                 }
 364         }
 365         zlog_debug("Speaks: %s", nlpid2string(&adj->nlpids));
 366
 367         return;
 368 }
 369
 370 int isis_adj_expire(struct thread *thread)
 371 {
 372         struct isis_adjacency *adj;
 373
 374         /*
 375          * Get the adjacency
 376          */
 377         adj = THREAD_ARG(thread);
 378         assert(adj);
 379         adj->t_expire = NULL;
 380
 381         /* trigger the adj expire event */
 382         isis_adj_state_change(adj, ISIS_ADJ_DOWN, "holding time expired");
 383
 384         return 0;
 385 }
 386
 387 /*
 388  * show isis neighbor [detail]
 389  */
 390 void isis_adj_print_vty(struct isis_adjacency *adj, struct vty *vty,
 391                         char detail)
 392 {
 393         time_t now;
 394         struct isis_dynhn *dyn;
 395         int level;
 396
 397         dyn = dynhn_find_by_id(adj->sysid);
 398         if (dyn)
 399                 vty_out(vty, "  %-20s", dyn->hostname);
 400         else
 401                 vty_out(vty, "  %-20s", sysid_print(adj->sysid));
 402
 403         if (detail == ISIS_UI_LEVEL_BRIEF) {
 404                 if (adj->circuit)
 405                         vty_out(vty, "%-12s", adj->circuit->interface->name);
 406                 else
 407                         vty_out(vty, "NULL circuit!");
 408                 vty_out(vty, "%-3u", adj->level); /* level */
 409                 vty_out(vty, "%-13s", adj_state2string(adj->adj_state));
 410                 now = time(NULL);
 411                 if (adj->last_upd)
 412                         vty_out(vty, "%-9llu",
 413                                 (unsigned long long)adj->last_upd
 414                                         + adj->hold_time - now);
 415                 else
 416                         vty_out(vty, "-        ");
 417                 vty_out(vty, "%-10s", snpa_print(adj->snpa));
 418                 vty_out(vty, "\n");
 419         }
 420
 421         if (detail == ISIS_UI_LEVEL_DETAIL) {
 422                 level = adj->level;
 423                 vty_out(vty, "\n");
 424                 if (adj->circuit)
 425                         vty_out(vty, "    Interface: %s",
 426                                 adj->circuit->interface->name);
 427                 else
 428                         vty_out(vty, "    Interface: NULL circuit");
 429                 vty_out(vty, ", Level: %u", adj->level); /* level */
 430                 vty_out(vty, ", State: %s", adj_state2string(adj->adj_state));
 431                 now = time(NULL);
 432                 if (adj->last_upd)
 433                         vty_out(vty, ", Expires in %s",
 434                                 time2string(adj->last_upd + adj->hold_time
 435                                             - now));
 436                 else
 437                         vty_out(vty, ", Expires in %s",
 438                                 time2string(adj->hold_time));
 439                 vty_out(vty, "\n");
 440                 vty_out(vty, "    Adjacency flaps: %u", adj->flaps);
 441                 vty_out(vty, ", Last: %s ago",
 442                         time2string(now - adj->last_flap));
 443                 vty_out(vty, "\n");
 444                 vty_out(vty, "    Circuit type: %s",
 445                         circuit_t2string(adj->circuit_t));
 446                 vty_out(vty, ", Speaks: %s", nlpid2string(&adj->nlpids));
 447                 vty_out(vty, "\n");
 448                 if (adj->mt_count != 1
 449                     || adj->mt_set[0] != ISIS_MT_IPV4_UNICAST) {
 450                         vty_out(vty, "    Topologies:\n");
 451                         for (unsigned int i = 0; i < adj->mt_count; i++)
 452                                 vty_out(vty, "      %s\n",
 453                                         isis_mtid2str(adj->mt_set[i]));
 454                 }
 455                 vty_out(vty, "    SNPA: %s", snpa_print(adj->snpa));
 456                 if (adj->circuit
 457                     && (adj->circuit->circ_type == CIRCUIT_T_BROADCAST)) {
 458                         dyn = dynhn_find_by_id(adj->lanid);
 459                         if (dyn)
 460                                 vty_out(vty, ", LAN id: %s.%02x", dyn->hostname,
 461                                         adj->lanid[ISIS_SYS_ID_LEN]);
 462                         else
 463                                 vty_out(vty, ", LAN id: %s.%02x",
 464                                         sysid_print(adj->lanid),
 465                                         adj->lanid[ISIS_SYS_ID_LEN]);
 466
 467                         vty_out(vty, "\n");
 468                         vty_out(vty, "    LAN Priority: %u",
 469                                 adj->prio[adj->level - 1]);
 470
 471                         vty_out(vty, ", %s, DIS flaps: %u, Last: %s ago",
 472                                 isis_disflag2string(
 473                                         adj->dis_record[ISIS_LEVELS + level - 1]
 474                                                 .dis),
 475                                 adj->dischanges[level - 1],
 476                                 time2string(now - (adj->dis_record[ISIS_LEVELS
 477                                                                    + level - 1]
 478                                                            .last_dis_change)));
 479                 }
 480                 vty_out(vty, "\n");
 481
 482                 if (adj->area_address_count) {
 483                         vty_out(vty, "    Area Address(es):\n");
 484                         for (unsigned int i = 0; i < adj->area_address_count;
 485                              i++) {
 486                                 vty_out(vty, "      %s\n",
 487                                         isonet_print(adj->area_addresses[i]
 488                                                              .area_addr,
 489                                                      adj->area_addresses[i]
 490                                                              .addr_len));
 491                         }
 492                 }
 493                 if (adj->ipv4_address_count) {
 494                         vty_out(vty, "    IPv4 Address(es):\n");
 495                         for (unsigned int i = 0; i < adj->ipv4_address_count;
 496                              i++)
 497                                 vty_out(vty, "      %s\n",
 498                                         inet_ntoa(adj->ipv4_addresses[i]));
 499                 }
 500                 if (adj->ipv6_address_count) {
 501                         vty_out(vty, "    IPv6 Address(es):\n");
 502                         for (unsigned int i = 0; i < adj->ipv6_address_count;
 503                              i++) {
 504                                 char buf[INET6_ADDRSTRLEN];
 505                                 inet_ntop(AF_INET6, &adj->ipv6_addresses[i],
 506                                           buf, sizeof(buf));
 507                                 vty_out(vty, "      %s\n", buf);
 508                         }
 509                 }
 510                 vty_out(vty, "\n");
 511         }
 512         return;
 513 }
 514
 515 void isis_adj_build_neigh_list(struct list *adjdb, struct list *list)
 516 {
 517         struct isis_adjacency *adj;
 518         struct listnode *node;
 519
 520         if (!list) {
 521                 zlog_warn("isis_adj_build_neigh_list(): NULL list");
 522                 return;
 523         }
 524
 525         for (ALL_LIST_ELEMENTS_RO(adjdb, node, adj)) {
 526                 if (!adj) {
 527                         zlog_warn("isis_adj_build_neigh_list(): NULL adj");
 528                         return;
 529                 }
 530
 531                 if ((adj->adj_state == ISIS_ADJ_UP
 532                      || adj->adj_state == ISIS_ADJ_INITIALIZING))
 533                         listnode_add(list, adj->snpa);
 534         }
 535         return;
 536 }
 537
 538 void isis_adj_build_up_list(struct list *adjdb, struct list *list)
 539 {
 540         struct isis_adjacency *adj;
 541         struct listnode *node;
 542
 543         if (adjdb == NULL) {
 544                 zlog_warn("isis_adj_build_up_list(): adjacency DB is empty");
 545                 return;
 546         }
 547
 548         if (!list) {
 549                 zlog_warn("isis_adj_build_up_list(): NULL list");
 550                 return;
 551         }
 552
 553         for (ALL_LIST_ELEMENTS_RO(adjdb, node, adj)) {
 554                 if (!adj) {
 555                         zlog_warn("isis_adj_build_up_list(): NULL adj");
 556                         return;
 557                 }
 558
 559                 if (adj->adj_state == ISIS_ADJ_UP)
 560                         listnode_add(list, adj);
 561         }
 562
 563         return;
 564 }
 565
 566 int isis_adj_usage2levels(enum isis_adj_usage usage)
 567 {
 568         switch (usage) {
 569         case ISIS_ADJ_LEVEL1:
 570                 return IS_LEVEL_1;
 571         case ISIS_ADJ_LEVEL2:
 572                 return IS_LEVEL_2;
 573         case ISIS_ADJ_LEVEL1AND2:
 574                 return IS_LEVEL_1 | IS_LEVEL_2;
 575         default:
 576                 break;
 577         }
 578         return 0;
 579 }