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