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(const struct adj *, const struct adj *);
  29 static int       adj_itimer(struct thread *);
  30 static __inline int tnbr_compare(const struct tnbr *, const 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(const struct adj *a, const 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 (if_cmp_name_func(a->source.link.ia->iface->name,
  64                                      b->source.link.ia->iface->name) < 0)
  65                         return (-1);
  66                 if (if_cmp_name_func(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 %pI4, %s", __func__, &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 void
 113 adj_del(struct adj *adj, uint32_t notif_status)
 114 {
 115         struct nbr      *nbr = adj->nbr;
 116
 117         log_debug("%s: lsr-id %pI4, %s (%s)", __func__, &adj->lsr_id,
 118             log_hello_src(&adj->source), af_name(adj_get_af(adj)));
 119
 120         adj_stop_itimer(adj);
 121
 122         RB_REMOVE(global_adj_head, &global.adj_tree, adj);
 123         if (nbr)
 124                 RB_REMOVE(nbr_adj_head, &nbr->adj_tree, adj);
 125         switch (adj->source.type) {
 126         case HELLO_LINK:
 127                 RB_REMOVE(ia_adj_head, &adj->source.link.ia->adj_tree, adj);
 128
 129                 if (nbr)
 130                         ldp_sync_fsm_adj_event(adj, LDP_SYNC_EVT_ADJ_DEL);
 131                 break;
 132         case HELLO_TARGETED:
 133                 adj->source.target->adj = NULL;
 134                 break;
 135         }
 136
 137         free(adj);
 138
 139         /*
 140          * If the neighbor still exists but none of its remaining
 141          * adjacencies (if any) are from the preferred address-family,
 142          * then delete it.
 143          */
 144         if (nbr && nbr_adj_count(nbr, nbr->af) == 0) {
 145                 session_shutdown(nbr, notif_status, 0, 0);
 146                 nbr_del(nbr);
 147         }
 148 }
 149
 150 struct adj *
 151 adj_find(struct in_addr lsr_id, struct hello_source *source)
 152 {
 153         struct adj       adj;
 154         adj.lsr_id = lsr_id;
 155         adj.source = *source;
 156         return (RB_FIND(global_adj_head, &global.adj_tree, &adj));
 157 }
 158
 159 int
 160 adj_get_af(const struct adj *adj)
 161 {
 162         switch (adj->source.type) {
 163         case HELLO_LINK:
 164                 return (adj->source.link.ia->af);
 165         case HELLO_TARGETED:
 166                 return (adj->source.target->af);
 167         default:
 168                 fatalx("adj_get_af: unknown hello type");
 169         }
 170 }
 171
 172 /* adjacency timers */
 173
 174 /* ARGSUSED */
 175 static int
 176 adj_itimer(struct thread *thread)
 177 {
 178         struct adj *adj = THREAD_ARG(thread);
 179
 180         adj->inactivity_timer = NULL;
 181
 182         log_debug("%s: lsr-id %pI4", __func__, &adj->lsr_id);
 183
 184         if (adj->source.type == HELLO_TARGETED) {
 185                 if (!(adj->source.target->flags & F_TNBR_CONFIGURED) &&
 186                     adj->source.target->pw_count == 0 &&
 187                     adj->source.target->rlfa_count == 0) {
 188                         /* remove dynamic targeted neighbor */
 189                         tnbr_del(leconf, adj->source.target);
 190                         return (0);
 191                 }
 192         }
 193
 194         adj_del(adj, S_HOLDTIME_EXP);
 195
 196         return (0);
 197 }
 198
 199 void
 200 adj_start_itimer(struct adj *adj)
 201 {
 202         thread_cancel(&adj->inactivity_timer);
 203         adj->inactivity_timer = NULL;
 204         thread_add_timer(master, adj_itimer, adj, adj->holdtime,
 205                          &adj->inactivity_timer);
 206 }
 207
 208 void
 209 adj_stop_itimer(struct adj *adj)
 210 {
 211         thread_cancel(&adj->inactivity_timer);
 212 }
 213
 214 /* targeted neighbors */
 215
 216 static __inline int
 217 tnbr_compare(const struct tnbr *a, const struct tnbr *b)
 218 {
 219         if (a->af < b->af)
 220                 return (-1);
 221         if (a->af > b->af)
 222                 return (1);
 223
 224         return (ldp_addrcmp(a->af, &a->addr, &b->addr));
 225 }
 226
 227 struct tnbr *
 228 tnbr_new(int af, union ldpd_addr *addr)
 229 {
 230         struct tnbr             *tnbr;
 231
 232         if ((tnbr = calloc(1, sizeof(*tnbr))) == NULL)
 233                 fatal(__func__);
 234
 235         tnbr->af = af;
 236         tnbr->addr = *addr;
 237         tnbr->state = TNBR_STA_DOWN;
 238
 239         return (tnbr);
 240 }
 241
 242 static void
 243 tnbr_del(struct ldpd_conf *xconf, struct tnbr *tnbr)
 244 {
 245         tnbr_stop(tnbr);
 246         RB_REMOVE(tnbr_head, &xconf->tnbr_tree, tnbr);
 247         free(tnbr);
 248 }
 249
 250 struct tnbr *
 251 tnbr_find(struct ldpd_conf *xconf, int af, union ldpd_addr *addr)
 252 {
 253         struct tnbr      tnbr;
 254         tnbr.af = af;
 255         tnbr.addr = *addr;
 256         return (RB_FIND(tnbr_head, &xconf->tnbr_tree, &tnbr));
 257 }
 258
 259 struct tnbr *
 260 tnbr_check(struct ldpd_conf *xconf, struct tnbr *tnbr)
 261 {
 262         if (!(tnbr->flags & (F_TNBR_CONFIGURED|F_TNBR_DYNAMIC)) &&
 263             tnbr->pw_count == 0 && tnbr->rlfa_count == 0) {
 264                 tnbr_del(xconf, tnbr);
 265                 return (NULL);
 266         }
 267
 268         return (tnbr);
 269 }
 270
 271 static void
 272 tnbr_start(struct tnbr *tnbr)
 273 {
 274         send_hello(HELLO_TARGETED, NULL, tnbr);
 275         tnbr_start_hello_timer(tnbr);
 276         tnbr->state = TNBR_STA_ACTIVE;
 277 }
 278
 279 static void
 280 tnbr_stop(struct tnbr *tnbr)
 281 {
 282         tnbr_stop_hello_timer(tnbr);
 283         if (tnbr->adj)
 284                 adj_del(tnbr->adj, S_SHUTDOWN);
 285         tnbr->state = TNBR_STA_DOWN;
 286 }
 287
 288 void
 289 tnbr_update(struct tnbr *tnbr)
 290 {
 291         int                      socket_ok, rtr_id_ok;
 292
 293         if ((ldp_af_global_get(&global, tnbr->af))->ldp_edisc_socket != -1)
 294                 socket_ok = 1;
 295         else
 296                 socket_ok = 0;
 297
 298         if (ldp_rtr_id_get(leconf) != INADDR_ANY)
 299                 rtr_id_ok = 1;
 300         else
 301                 rtr_id_ok = 0;
 302
 303         if (tnbr->state == TNBR_STA_DOWN) {
 304                 if (!socket_ok || !rtr_id_ok)
 305                         return;
 306
 307                 tnbr_start(tnbr);
 308         } else if (tnbr->state == TNBR_STA_ACTIVE) {
 309                 if (socket_ok && rtr_id_ok)
 310                         return;
 311
 312                 tnbr_stop(tnbr);
 313         }
 314 }
 315
 316 void
 317 tnbr_update_all(int af)
 318 {
 319         struct tnbr             *tnbr;
 320
 321         /* update targeted neighbors */
 322         RB_FOREACH(tnbr, tnbr_head, &leconf->tnbr_tree)
 323                 if (tnbr->af == af || af == AF_UNSPEC)
 324                         tnbr_update(tnbr);
 325 }
 326
 327 uint16_t
 328 tnbr_get_hello_holdtime(struct tnbr *tnbr)
 329 {
 330         if ((ldp_af_conf_get(leconf, tnbr->af))->thello_holdtime != 0)
 331                 return ((ldp_af_conf_get(leconf, tnbr->af))->thello_holdtime);
 332
 333         return (leconf->thello_holdtime);
 334 }
 335
 336 uint16_t
 337 tnbr_get_hello_interval(struct tnbr *tnbr)
 338 {
 339         if ((ldp_af_conf_get(leconf, tnbr->af))->thello_interval != 0)
 340                 return ((ldp_af_conf_get(leconf, tnbr->af))->thello_interval);
 341
 342         return (leconf->thello_interval);
 343 }
 344
 345 /* target neighbors timers */
 346
 347 /* ARGSUSED */
 348 static int
 349 tnbr_hello_timer(struct thread *thread)
 350 {
 351         struct tnbr     *tnbr = THREAD_ARG(thread);
 352
 353         tnbr->hello_timer = NULL;
 354         send_hello(HELLO_TARGETED, NULL, tnbr);
 355         tnbr_start_hello_timer(tnbr);
 356
 357         return (0);
 358 }
 359
 360 static void
 361 tnbr_start_hello_timer(struct tnbr *tnbr)
 362 {
 363         thread_cancel(&tnbr->hello_timer);
 364         tnbr->hello_timer = NULL;
 365         thread_add_timer(master, tnbr_hello_timer, tnbr, tnbr_get_hello_interval(tnbr),
 366                          &tnbr->hello_timer);
 367 }
 368
 369 static void
 370 tnbr_stop_hello_timer(struct tnbr *tnbr)
 371 {
 372         thread_cancel(&tnbr->hello_timer);
 373 }
 374
 375 struct ctl_adj *
 376 adj_to_ctl(struct adj *adj)
 377 {
 378         static struct ctl_adj    actl;
 379
 380         actl.af = adj_get_af(adj);
 381         actl.id = adj->lsr_id;
 382         actl.type = adj->source.type;
 383         switch (adj->source.type) {
 384         case HELLO_LINK:
 385                 memcpy(actl.ifname, adj->source.link.ia->iface->name,
 386                     sizeof(actl.ifname));
 387                 actl.src_addr = adj->source.link.src_addr;
 388                 break;
 389         case HELLO_TARGETED:
 390                 actl.src_addr = adj->source.target->addr;
 391                 break;
 392         }
 393         actl.holdtime = adj->holdtime;
 394         actl.holdtime_remaining =
 395             thread_timer_remain_second(adj->inactivity_timer);
 396         actl.trans_addr = adj->trans_addr;
 397         actl.ds_tlv = adj->ds_tlv;
 398
 399         return (&actl);
 400 }