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