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                         /* remove dynamic targeted neighbor */
 188                         tnbr_del(leconf, adj->source.target);
 189                         return (0);
 190                 }
 191         }
 192
 193         adj_del(adj, S_HOLDTIME_EXP);
 194
 195         return (0);
 196 }
 197
 198 void
 199 adj_start_itimer(struct adj *adj)
 200 {
 201         thread_cancel(&adj->inactivity_timer);
 202         adj->inactivity_timer = NULL;
 203         thread_add_timer(master, adj_itimer, adj, adj->holdtime,
 204                          &adj->inactivity_timer);
 205 }
 206
 207 void
 208 adj_stop_itimer(struct adj *adj)
 209 {
 210         thread_cancel(&adj->inactivity_timer);
 211 }
 212
 213 /* targeted neighbors */
 214
 215 static __inline int
 216 tnbr_compare(const struct tnbr *a, const struct tnbr *b)
 217 {
 218         if (a->af < b->af)
 219                 return (-1);
 220         if (a->af > b->af)
 221                 return (1);
 222
 223         return (ldp_addrcmp(a->af, &a->addr, &b->addr));
 224 }
 225
 226 struct tnbr *
 227 tnbr_new(int af, union ldpd_addr *addr)
 228 {
 229         struct tnbr             *tnbr;
 230
 231         if ((tnbr = calloc(1, sizeof(*tnbr))) == NULL)
 232                 fatal(__func__);
 233
 234         tnbr->af = af;
 235         tnbr->addr = *addr;
 236         tnbr->state = TNBR_STA_DOWN;
 237
 238         return (tnbr);
 239 }
 240
 241 static void
 242 tnbr_del(struct ldpd_conf *xconf, struct tnbr *tnbr)
 243 {
 244         tnbr_stop(tnbr);
 245         RB_REMOVE(tnbr_head, &xconf->tnbr_tree, tnbr);
 246         free(tnbr);
 247 }
 248
 249 struct tnbr *
 250 tnbr_find(struct ldpd_conf *xconf, int af, union ldpd_addr *addr)
 251 {
 252         struct tnbr      tnbr;
 253         tnbr.af = af;
 254         tnbr.addr = *addr;
 255         return (RB_FIND(tnbr_head, &xconf->tnbr_tree, &tnbr));
 256 }
 257
 258 struct tnbr *
 259 tnbr_check(struct ldpd_conf *xconf, struct tnbr *tnbr)
 260 {
 261         if (!(tnbr->flags & (F_TNBR_CONFIGURED|F_TNBR_DYNAMIC)) &&
 262             tnbr->pw_count == 0) {
 263                 tnbr_del(xconf, tnbr);
 264                 return (NULL);
 265         }
 266
 267         return (tnbr);
 268 }
 269
 270 static void
 271 tnbr_start(struct tnbr *tnbr)
 272 {
 273         send_hello(HELLO_TARGETED, NULL, tnbr);
 274         tnbr_start_hello_timer(tnbr);
 275         tnbr->state = TNBR_STA_ACTIVE;
 276 }
 277
 278 static void
 279 tnbr_stop(struct tnbr *tnbr)
 280 {
 281         tnbr_stop_hello_timer(tnbr);
 282         if (tnbr->adj)
 283                 adj_del(tnbr->adj, S_SHUTDOWN);
 284         tnbr->state = TNBR_STA_DOWN;
 285 }
 286
 287 void
 288 tnbr_update(struct tnbr *tnbr)
 289 {
 290         int                      socket_ok, rtr_id_ok;
 291
 292         if ((ldp_af_global_get(&global, tnbr->af))->ldp_edisc_socket != -1)
 293                 socket_ok = 1;
 294         else
 295                 socket_ok = 0;
 296
 297         if (ldp_rtr_id_get(leconf) != INADDR_ANY)
 298                 rtr_id_ok = 1;
 299         else
 300                 rtr_id_ok = 0;
 301
 302         if (tnbr->state == TNBR_STA_DOWN) {
 303                 if (!socket_ok || !rtr_id_ok)
 304                         return;
 305
 306                 tnbr_start(tnbr);
 307         } else if (tnbr->state == TNBR_STA_ACTIVE) {
 308                 if (socket_ok && rtr_id_ok)
 309                         return;
 310
 311                 tnbr_stop(tnbr);
 312         }
 313 }
 314
 315 void
 316 tnbr_update_all(int af)
 317 {
 318         struct tnbr             *tnbr;
 319
 320         /* update targeted neighbors */
 321         RB_FOREACH(tnbr, tnbr_head, &leconf->tnbr_tree)
 322                 if (tnbr->af == af || af == AF_UNSPEC)
 323                         tnbr_update(tnbr);
 324 }
 325
 326 uint16_t
 327 tnbr_get_hello_holdtime(struct tnbr *tnbr)
 328 {
 329         if ((ldp_af_conf_get(leconf, tnbr->af))->thello_holdtime != 0)
 330                 return ((ldp_af_conf_get(leconf, tnbr->af))->thello_holdtime);
 331
 332         return (leconf->thello_holdtime);
 333 }
 334
 335 uint16_t
 336 tnbr_get_hello_interval(struct tnbr *tnbr)
 337 {
 338         if ((ldp_af_conf_get(leconf, tnbr->af))->thello_interval != 0)
 339                 return ((ldp_af_conf_get(leconf, tnbr->af))->thello_interval);
 340
 341         return (leconf->thello_interval);
 342 }
 343
 344 /* target neighbors timers */
 345
 346 /* ARGSUSED */
 347 static int
 348 tnbr_hello_timer(struct thread *thread)
 349 {
 350         struct tnbr     *tnbr = THREAD_ARG(thread);
 351
 352         tnbr->hello_timer = NULL;
 353         send_hello(HELLO_TARGETED, NULL, tnbr);
 354         tnbr_start_hello_timer(tnbr);
 355
 356         return (0);
 357 }
 358
 359 static void
 360 tnbr_start_hello_timer(struct tnbr *tnbr)
 361 {
 362         thread_cancel(&tnbr->hello_timer);
 363         tnbr->hello_timer = NULL;
 364         thread_add_timer(master, tnbr_hello_timer, tnbr, tnbr_get_hello_interval(tnbr),
 365                          &tnbr->hello_timer);
 366 }
 367
 368 static void
 369 tnbr_stop_hello_timer(struct tnbr *tnbr)
 370 {
 371         thread_cancel(&tnbr->hello_timer);
 372 }
 373
 374 struct ctl_adj *
 375 adj_to_ctl(struct adj *adj)
 376 {
 377         static struct ctl_adj    actl;
 378
 379         actl.af = adj_get_af(adj);
 380         actl.id = adj->lsr_id;
 381         actl.type = adj->source.type;
 382         switch (adj->source.type) {
 383         case HELLO_LINK:
 384                 memcpy(actl.ifname, adj->source.link.ia->iface->name,
 385                     sizeof(actl.ifname));
 386                 actl.src_addr = adj->source.link.src_addr;
 387                 break;
 388         case HELLO_TARGETED:
 389                 actl.src_addr = adj->source.target->addr;
 390                 break;
 391         }
 392         actl.holdtime = adj->holdtime;
 393         actl.holdtime_remaining =
 394             thread_timer_remain_second(adj->inactivity_timer);
 395         actl.trans_addr = adj->trans_addr;
 396         actl.ds_tlv = adj->ds_tlv;
 397
 398         return (&actl);
 399 }