ldpd/adjacency.c

   1 /*      $OpenBSD$ */
   2
   3 /*
   4  * Copyright (c) 2013, 2015 Renato Westphal <renato@openbsd.org>
   5  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
   6  * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
   7  * Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org>
   8  *
   9  * Permission to use, copy, modify, and distribute this software for any
  10  * purpose with or without fee is hereby granted, provided that the above
  11  * copyright notice and this permission notice appear in all copies.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  14  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  15  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  16  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  17  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  18  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  19  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  20  */
  21
  22 #include <zebra.h>
  23
  24 #include "ldpd.h"
  25 #include "ldpe.h"
  26 #include "log.h"
  27
  28 static __inline int adj_compare(struct adj *, struct adj *);
  29 static int       adj_itimer(struct thread *);
  30 static __inline int tnbr_compare(struct tnbr *, struct tnbr *);
  31 static void      tnbr_del(struct ldpd_conf *, struct tnbr *);
  32 static void      tnbr_start(struct tnbr *);
  33 static void      tnbr_stop(struct tnbr *);
  34 static int       tnbr_hello_timer(struct thread *);
  35 static void      tnbr_start_hello_timer(struct tnbr *);
  36 static void      tnbr_stop_hello_timer(struct tnbr *);
  37
  38 RB_GENERATE(global_adj_head, adj, global_entry, adj_compare)
  39 RB_GENERATE(nbr_adj_head, adj, nbr_entry, adj_compare)
  40 RB_GENERATE(ia_adj_head, adj, ia_entry, adj_compare)
  41 RB_GENERATE(tnbr_head, tnbr, entry, tnbr_compare)
  42
  43 static __inline int
  44 adj_compare(struct adj *a, struct adj *b)
  45 {
  46         if (adj_get_af(a) < adj_get_af(b))
  47                 return (-1);
  48         if (adj_get_af(a) > adj_get_af(b))
  49                 return (1);
  50
  51         if (ntohl(a->lsr_id.s_addr) < ntohl(b->lsr_id.s_addr))
  52                 return (-1);
  53         if (ntohl(a->lsr_id.s_addr) > ntohl(b->lsr_id.s_addr))
  54                 return (1);
  55
  56         if (a->source.type < b->source.type)
  57                 return (-1);
  58         if (a->source.type > b->source.type)
  59                 return (1);
  60
  61         switch (a->source.type) {
  62         case HELLO_LINK:
  63                 if (strcmp(a->source.link.ia->iface->name,
  64                     b->source.link.ia->iface->name) < 0)
  65                         return (-1);
  66                 if (strcmp(a->source.link.ia->iface->name,
  67                     b->source.link.ia->iface->name) > 0)
  68                         return (1);
  69                 return (ldp_addrcmp(a->source.link.ia->af,
  70                     &a->source.link.src_addr, &b->source.link.src_addr));
  71         case HELLO_TARGETED:
  72                 return (ldp_addrcmp(a->source.target->af,
  73                     &a->source.target->addr, &b->source.target->addr));
  74         default:
  75                 fatalx("adj_compare: unknown hello type");
  76         }
  77
  78         return (0);
  79 }
  80
  81 struct adj *
  82 adj_new(struct in_addr lsr_id, struct hello_source *source,
  83     union ldpd_addr *addr)
  84 {
  85         struct adj      *adj;
  86
  87         log_debug("%s: lsr-id %s, %s", __func__, inet_ntoa(lsr_id),
  88             log_hello_src(source));
  89
  90         if ((adj = calloc(1, sizeof(*adj))) == NULL)
  91                 fatal(__func__);
  92
  93         adj->lsr_id = lsr_id;
  94         adj->nbr = NULL;
  95         adj->source = *source;
  96         adj->trans_addr = *addr;
  97
  98         RB_INSERT(global_adj_head, &global.adj_tree, adj);
  99
 100         switch (source->type) {
 101         case HELLO_LINK:
 102                 RB_INSERT(ia_adj_head, &source->link.ia->adj_tree, adj);
 103                 break;
 104         case HELLO_TARGETED:
 105                 source->target->adj = adj;
 106                 break;
 107         }
 108
 109         return (adj);
 110 }
 111
 112 static void
 113 adj_del_single(struct adj *adj)
 114 {
 115         log_debug("%s: lsr-id %s, %s (%s)", __func__, inet_ntoa(adj->lsr_id),
 116             log_hello_src(&adj->source), af_name(adj_get_af(adj)));
 117
 118         adj_stop_itimer(adj);
 119
 120         RB_REMOVE(global_adj_head, &global.adj_tree, adj);
 121         if (adj->nbr)
 122                 RB_REMOVE(nbr_adj_head, &adj->nbr->adj_tree, adj);
 123         switch (adj->source.type) {
 124         case HELLO_LINK:
 125                 RB_REMOVE(ia_adj_head, &adj->source.link.ia->adj_tree, adj);
 126                 break;
 127         case HELLO_TARGETED:
 128                 adj->source.target->adj = NULL;
 129                 break;
 130         }
 131
 132         free(adj);
 133 }
 134
 135 void
 136 adj_del(struct adj *adj, uint32_t notif_status)
 137 {
 138         struct nbr      *nbr = adj->nbr;
 139         struct adj      *atmp;
 140
 141         adj_del_single(adj);
 142
 143         /*
 144          * If the neighbor still exists but none of its remaining
 145          * adjacencies (if any) are from the preferred address-family,
 146          * then delete it.
 147          */
 148         if (nbr && nbr_adj_count(nbr, nbr->af) == 0) {
 149                 RB_FOREACH_SAFE(adj, nbr_adj_head, &nbr->adj_tree, atmp)
 150                         adj_del_single(adj);
 151                 session_shutdown(nbr, notif_status, 0, 0);
 152                 nbr_del(nbr);
 153         }
 154 }
 155
 156 struct adj *
 157 adj_find(struct in_addr lsr_id, struct hello_source *source)
 158 {
 159         struct adj       adj;
 160         adj.lsr_id = lsr_id;
 161         adj.source = *source;
 162         return (RB_FIND(global_adj_head, &global.adj_tree, &adj));
 163 }
 164
 165 int
 166 adj_get_af(struct adj *adj)
 167 {
 168         switch (adj->source.type) {
 169         case HELLO_LINK:
 170                 return (adj->source.link.ia->af);
 171         case HELLO_TARGETED:
 172                 return (adj->source.target->af);
 173         default:
 174                 fatalx("adj_get_af: unknown hello type");
 175         }
 176 }
 177
 178 /* adjacency timers */
 179
 180 /* ARGSUSED */
 181 static int
 182 adj_itimer(struct thread *thread)
 183 {
 184         struct adj *adj = THREAD_ARG(thread);
 185
 186         adj->inactivity_timer = NULL;
 187
 188         log_debug("%s: lsr-id %s", __func__, inet_ntoa(adj->lsr_id));
 189
 190         if (adj->source.type == HELLO_TARGETED) {
 191                 if (!(adj->source.target->flags & F_TNBR_CONFIGURED) &&
 192                     adj->source.target->pw_count == 0) {
 193                         /* remove dynamic targeted neighbor */
 194                         tnbr_del(leconf, adj->source.target);
 195                         return (0);
 196                 }
 197                 adj->source.target->adj = NULL;
 198         }
 199
 200         adj_del(adj, S_HOLDTIME_EXP);
 201
 202         return (0);
 203 }
 204
 205 void
 206 adj_start_itimer(struct adj *adj)
 207 {
 208         THREAD_TIMER_OFF(adj->inactivity_timer);
 209         adj->inactivity_timer = thread_add_timer(master, adj_itimer, adj,
 210             adj->holdtime);
 211 }
 212
 213 void
 214 adj_stop_itimer(struct adj *adj)
 215 {
 216         THREAD_TIMER_OFF(adj->inactivity_timer);
 217 }
 218
 219 /* targeted neighbors */
 220
 221 static __inline int
 222 tnbr_compare(struct tnbr *a, struct tnbr *b)
 223 {
 224         if (a->af < b->af)
 225                 return (-1);
 226         if (a->af > b->af)
 227                 return (1);
 228
 229         return (ldp_addrcmp(a->af, &a->addr, &b->addr));
 230 }
 231
 232 struct tnbr *
 233 tnbr_new(int af, union ldpd_addr *addr)
 234 {
 235         struct tnbr             *tnbr;
 236
 237         if ((tnbr = calloc(1, sizeof(*tnbr))) == NULL)
 238                 fatal(__func__);
 239
 240         tnbr->af = af;
 241         tnbr->addr = *addr;
 242         tnbr->state = TNBR_STA_DOWN;
 243
 244         return (tnbr);
 245 }
 246
 247 static void
 248 tnbr_del(struct ldpd_conf *xconf, struct tnbr *tnbr)
 249 {
 250         tnbr_stop(tnbr);
 251         RB_REMOVE(tnbr_head, &xconf->tnbr_tree, tnbr);
 252         free(tnbr);
 253 }
 254
 255 struct tnbr *
 256 tnbr_find(struct ldpd_conf *xconf, int af, union ldpd_addr *addr)
 257 {
 258         struct tnbr      tnbr;
 259         tnbr.af = af;
 260         tnbr.addr = *addr;
 261         return (RB_FIND(tnbr_head, &xconf->tnbr_tree, &tnbr));
 262 }
 263
 264 struct tnbr *
 265 tnbr_check(struct ldpd_conf *xconf, struct tnbr *tnbr)
 266 {
 267         if (!(tnbr->flags & (F_TNBR_CONFIGURED|F_TNBR_DYNAMIC)) &&
 268             tnbr->pw_count == 0) {
 269                 tnbr_del(xconf, tnbr);
 270                 return (NULL);
 271         }
 272
 273         return (tnbr);
 274 }
 275
 276 static void
 277 tnbr_start(struct tnbr *tnbr)
 278 {
 279         send_hello(HELLO_TARGETED, NULL, tnbr);
 280         tnbr_start_hello_timer(tnbr);
 281         tnbr->state = TNBR_STA_ACTIVE;
 282 }
 283
 284 static void
 285 tnbr_stop(struct tnbr *tnbr)
 286 {
 287         tnbr_stop_hello_timer(tnbr);
 288         if (tnbr->adj)
 289                 adj_del(tnbr->adj, S_SHUTDOWN);
 290         tnbr->state = TNBR_STA_DOWN;
 291 }
 292
 293 void
 294 tnbr_update(struct tnbr *tnbr)
 295 {
 296         int                      socket_ok, rtr_id_ok;
 297
 298         if ((ldp_af_global_get(&global, tnbr->af))->ldp_edisc_socket != -1)
 299                 socket_ok = 1;
 300         else
 301                 socket_ok = 0;
 302
 303         if (ldp_rtr_id_get(leconf) != INADDR_ANY)
 304                 rtr_id_ok = 1;
 305         else
 306                 rtr_id_ok = 0;
 307
 308         if (tnbr->state == TNBR_STA_DOWN) {
 309                 if (!socket_ok || !rtr_id_ok)
 310                         return;
 311
 312                 tnbr_start(tnbr);
 313         } else if (tnbr->state == TNBR_STA_ACTIVE) {
 314                 if (socket_ok && rtr_id_ok)
 315                         return;
 316
 317                 tnbr_stop(tnbr);
 318         }
 319 }
 320
 321 void
 322 tnbr_update_all(int af)
 323 {
 324         struct tnbr             *tnbr;
 325
 326         /* update targeted neighbors */
 327         RB_FOREACH(tnbr, tnbr_head, &leconf->tnbr_tree)
 328                 if (tnbr->af == af || af == AF_UNSPEC)
 329                         tnbr_update(tnbr);
 330 }
 331
 332 uint16_t
 333 tnbr_get_hello_holdtime(struct tnbr *tnbr)
 334 {
 335         if ((ldp_af_conf_get(leconf, tnbr->af))->thello_holdtime != 0)
 336                 return ((ldp_af_conf_get(leconf, tnbr->af))->thello_holdtime);
 337
 338         return (leconf->thello_holdtime);
 339 }
 340
 341 uint16_t
 342 tnbr_get_hello_interval(struct tnbr *tnbr)
 343 {
 344         if ((ldp_af_conf_get(leconf, tnbr->af))->thello_interval != 0)
 345                 return ((ldp_af_conf_get(leconf, tnbr->af))->thello_interval);
 346
 347         return (leconf->thello_interval);
 348 }
 349
 350 /* target neighbors timers */
 351
 352 /* ARGSUSED */
 353 static int
 354 tnbr_hello_timer(struct thread *thread)
 355 {
 356         struct tnbr     *tnbr = THREAD_ARG(thread);
 357
 358         tnbr->hello_timer = NULL;
 359         send_hello(HELLO_TARGETED, NULL, tnbr);
 360         tnbr_start_hello_timer(tnbr);
 361
 362         return (0);
 363 }
 364
 365 static void
 366 tnbr_start_hello_timer(struct tnbr *tnbr)
 367 {
 368         THREAD_TIMER_OFF(tnbr->hello_timer);
 369         tnbr->hello_timer = thread_add_timer(master, tnbr_hello_timer, tnbr,
 370             tnbr_get_hello_interval(tnbr));
 371 }
 372
 373 static void
 374 tnbr_stop_hello_timer(struct tnbr *tnbr)
 375 {
 376         THREAD_TIMER_OFF(tnbr->hello_timer);
 377 }
 378
 379 struct ctl_adj *
 380 adj_to_ctl(struct adj *adj)
 381 {
 382         static struct ctl_adj    actl;
 383
 384         actl.af = adj_get_af(adj);
 385         actl.id = adj->lsr_id;
 386         actl.type = adj->source.type;
 387         switch (adj->source.type) {
 388         case HELLO_LINK:
 389                 memcpy(actl.ifname, adj->source.link.ia->iface->name,
 390                     sizeof(actl.ifname));
 391                 actl.src_addr = adj->source.link.src_addr;
 392                 break;
 393         case HELLO_TARGETED:
 394                 actl.src_addr = adj->source.target->addr;
 395                 break;
 396         }
 397         actl.holdtime = adj->holdtime;
 398         actl.holdtime_remaining =
 399             thread_timer_remain_second(adj->inactivity_timer);
 400         actl.trans_addr = adj->trans_addr;
 401         actl.ds_tlv = adj->ds_tlv;
 402
 403         return (&actl);
 404 }