ldpd/lde_lib.c

   1 /*      $OpenBSD$ */
   2
   3 /*
   4  * Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org>
   5  * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #include <zebra.h>
  21
  22 #include "ldpd.h"
  23 #include "lde.h"
  24 #include "log.h"
  25
  26 #include "mpls.h"
  27
  28 static __inline int      fec_compare(struct fec *, struct fec *);
  29 static int               lde_nbr_is_nexthop(struct fec_node *,
  30                             struct lde_nbr *);
  31 static void              fec_free(void *);
  32 static struct fec_node  *fec_add(struct fec *fec);
  33 static struct fec_nh    *fec_nh_add(struct fec_node *, int, union ldpd_addr *,
  34                             ifindex_t, uint8_t);
  35 static void              fec_nh_del(struct fec_nh *);
  36
  37 RB_GENERATE(fec_tree, fec, entry, fec_compare)
  38
  39 struct fec_tree          ft = RB_INITIALIZER(&ft);
  40 struct thread           *gc_timer;
  41
  42 /* FEC tree functions */
  43 void
  44 fec_init(struct fec_tree *fh)
  45 {
  46         RB_INIT(fh);
  47 }
  48
  49 static __inline int
  50 fec_compare(struct fec *a, struct fec *b)
  51 {
  52         if (a->type < b->type)
  53                 return (-1);
  54         if (a->type > b->type)
  55                 return (1);
  56
  57         switch (a->type) {
  58         case FEC_TYPE_IPV4:
  59                 if (ntohl(a->u.ipv4.prefix.s_addr) <
  60                     ntohl(b->u.ipv4.prefix.s_addr))
  61                         return (-1);
  62                 if (ntohl(a->u.ipv4.prefix.s_addr) >
  63                     ntohl(b->u.ipv4.prefix.s_addr))
  64                         return (1);
  65                 if (a->u.ipv4.prefixlen < b->u.ipv4.prefixlen)
  66                         return (-1);
  67                 if (a->u.ipv4.prefixlen > b->u.ipv4.prefixlen)
  68                         return (1);
  69                 return (0);
  70         case FEC_TYPE_IPV6:
  71                 if (memcmp(&a->u.ipv6.prefix, &b->u.ipv6.prefix,
  72                     sizeof(struct in6_addr)) < 0)
  73                         return (-1);
  74                 if (memcmp(&a->u.ipv6.prefix, &b->u.ipv6.prefix,
  75                     sizeof(struct in6_addr)) > 0)
  76                         return (1);
  77                 if (a->u.ipv6.prefixlen < b->u.ipv6.prefixlen)
  78                         return (-1);
  79                 if (a->u.ipv6.prefixlen > b->u.ipv6.prefixlen)
  80                         return (1);
  81                 return (0);
  82         case FEC_TYPE_PWID:
  83                 if (a->u.pwid.type < b->u.pwid.type)
  84                         return (-1);
  85                 if (a->u.pwid.type > b->u.pwid.type)
  86                         return (1);
  87                 if (a->u.pwid.pwid < b->u.pwid.pwid)
  88                         return (-1);
  89                 if (a->u.pwid.pwid > b->u.pwid.pwid)
  90                         return (1);
  91                 if (ntohl(a->u.pwid.lsr_id.s_addr) <
  92                     ntohl(b->u.pwid.lsr_id.s_addr))
  93                         return (-1);
  94                 if (ntohl(a->u.pwid.lsr_id.s_addr) >
  95                     ntohl(b->u.pwid.lsr_id.s_addr))
  96                         return (1);
  97                 return (0);
  98         }
  99
 100         return (-1);
 101 }
 102
 103 struct fec *
 104 fec_find(struct fec_tree *fh, struct fec *f)
 105 {
 106         return (RB_FIND(fec_tree, fh, f));
 107 }
 108
 109 int
 110 fec_insert(struct fec_tree *fh, struct fec *f)
 111 {
 112         if (RB_INSERT(fec_tree, fh, f) != NULL)
 113                 return (-1);
 114         return (0);
 115 }
 116
 117 int
 118 fec_remove(struct fec_tree *fh, struct fec *f)
 119 {
 120         if (RB_REMOVE(fec_tree, fh, f) == NULL) {
 121                 log_warnx("%s failed for %s", __func__, log_fec(f));
 122                 return (-1);
 123         }
 124         return (0);
 125 }
 126
 127 void
 128 fec_clear(struct fec_tree *fh, void (*free_cb)(void *))
 129 {
 130         struct fec      *f;
 131
 132         while ((f = RB_ROOT(fh)) != NULL) {
 133                 fec_remove(fh, f);
 134                 free_cb(f);
 135         }
 136 }
 137
 138 /* routing table functions */
 139 static int
 140 lde_nbr_is_nexthop(struct fec_node *fn, struct lde_nbr *ln)
 141 {
 142         struct fec_nh           *fnh;
 143
 144         LIST_FOREACH(fnh, &fn->nexthops, entry)
 145                 if (lde_address_find(ln, fnh->af, &fnh->nexthop))
 146                         return (1);
 147
 148         return (0);
 149 }
 150
 151 void
 152 rt_dump(pid_t pid)
 153 {
 154         struct fec              *f;
 155         struct fec_node         *fn;
 156         struct lde_map          *me;
 157         static struct ctl_rt     rtctl;
 158
 159         RB_FOREACH(f, fec_tree, &ft) {
 160                 fn = (struct fec_node *)f;
 161                 if (fn->local_label == NO_LABEL &&
 162                     RB_EMPTY(&fn->downstream))
 163                         continue;
 164
 165                 memset(&rtctl, 0, sizeof(rtctl));
 166                 switch (fn->fec.type) {
 167                 case FEC_TYPE_IPV4:
 168                         rtctl.af = AF_INET;
 169                         rtctl.prefix.v4 = fn->fec.u.ipv4.prefix;
 170                         rtctl.prefixlen = fn->fec.u.ipv4.prefixlen;
 171                         break;
 172                 case FEC_TYPE_IPV6:
 173                         rtctl.af = AF_INET6;
 174                         rtctl.prefix.v6 = fn->fec.u.ipv6.prefix;
 175                         rtctl.prefixlen = fn->fec.u.ipv6.prefixlen;
 176                         break;
 177                 default:
 178                         continue;
 179                 }
 180
 181                 rtctl.local_label = fn->local_label;
 182                 if (RB_EMPTY(&fn->downstream)) {
 183                         rtctl.in_use = 0;
 184                         rtctl.nexthop.s_addr = INADDR_ANY;
 185                         rtctl.remote_label = NO_LABEL;
 186                         rtctl.no_downstream = 1;
 187                 }
 188                 lde_imsg_compose_ldpe(IMSG_CTL_SHOW_LIB_BEGIN, 0, pid, &rtctl,
 189                     sizeof(rtctl));
 190
 191                 RB_FOREACH(me, lde_map_head, &fn->upstream) {
 192                         rtctl.nexthop = me->nexthop->id;
 193                         lde_imsg_compose_ldpe(IMSG_CTL_SHOW_LIB_SENT, 0, pid,
 194                             &rtctl, sizeof(rtctl));
 195                 }
 196
 197                 RB_FOREACH(me, lde_map_head, &fn->downstream) {
 198                         rtctl.in_use = lde_nbr_is_nexthop(fn, me->nexthop);
 199                         rtctl.nexthop = me->nexthop->id;
 200                         rtctl.remote_label = me->map.label;
 201                         lde_imsg_compose_ldpe(IMSG_CTL_SHOW_LIB_RCVD, 0, pid,
 202                             &rtctl, sizeof(rtctl));
 203                 }
 204                 lde_imsg_compose_ldpe(IMSG_CTL_SHOW_LIB_END, 0, pid, &rtctl,
 205                     sizeof(rtctl));
 206         }
 207 }
 208
 209 void
 210 fec_snap(struct lde_nbr *ln)
 211 {
 212         struct fec      *f;
 213         struct fec_node *fn;
 214
 215         RB_FOREACH(f, fec_tree, &ft) {
 216                 fn = (struct fec_node *)f;
 217                 if (fn->local_label == NO_LABEL)
 218                         continue;
 219
 220                 lde_send_labelmapping(ln, fn, 0);
 221         }
 222
 223         lde_imsg_compose_ldpe(IMSG_MAPPING_ADD_END, ln->peerid, 0, NULL, 0);
 224 }
 225
 226 static void
 227 fec_free(void *arg)
 228 {
 229         struct fec_node *fn = arg;
 230         struct fec_nh   *fnh;
 231
 232         while ((fnh = LIST_FIRST(&fn->nexthops)))
 233                 fec_nh_del(fnh);
 234         if (!RB_EMPTY(&fn->downstream))
 235                 log_warnx("%s: fec %s downstream list not empty", __func__,
 236                     log_fec(&fn->fec));
 237         if (!RB_EMPTY(&fn->upstream))
 238                 log_warnx("%s: fec %s upstream list not empty", __func__,
 239                     log_fec(&fn->fec));
 240
 241         free(fn);
 242 }
 243
 244 void
 245 fec_tree_clear(void)
 246 {
 247         fec_clear(&ft, fec_free);
 248 }
 249
 250 static struct fec_node *
 251 fec_add(struct fec *fec)
 252 {
 253         struct fec_node *fn;
 254
 255         fn = calloc(1, sizeof(*fn));
 256         if (fn == NULL)
 257                 fatal(__func__);
 258
 259         fn->fec = *fec;
 260         fn->local_label = NO_LABEL;
 261         RB_INIT(&fn->upstream);
 262         RB_INIT(&fn->downstream);
 263         LIST_INIT(&fn->nexthops);
 264
 265         if (fec_insert(&ft, &fn->fec))
 266                 log_warnx("failed to add %s to ft tree",
 267                     log_fec(&fn->fec));
 268
 269         return (fn);
 270 }
 271
 272 struct fec_nh *
 273 fec_nh_find(struct fec_node *fn, int af, union ldpd_addr *nexthop,
 274     ifindex_t ifindex, uint8_t priority)
 275 {
 276         struct fec_nh   *fnh;
 277
 278         LIST_FOREACH(fnh, &fn->nexthops, entry)
 279                 if (fnh->af == af &&
 280                     ldp_addrcmp(af, &fnh->nexthop, nexthop) == 0 &&
 281                     fnh->ifindex == ifindex &&
 282                     fnh->priority == priority)
 283                         return (fnh);
 284
 285         return (NULL);
 286 }
 287
 288 static struct fec_nh *
 289 fec_nh_add(struct fec_node *fn, int af, union ldpd_addr *nexthop,
 290     ifindex_t ifindex, uint8_t priority)
 291 {
 292         struct fec_nh   *fnh;
 293
 294         fnh = calloc(1, sizeof(*fnh));
 295         if (fnh == NULL)
 296                 fatal(__func__);
 297
 298         fnh->af = af;
 299         fnh->nexthop = *nexthop;
 300         fnh->ifindex = ifindex;
 301         fnh->remote_label = NO_LABEL;
 302         fnh->priority = priority;
 303         LIST_INSERT_HEAD(&fn->nexthops, fnh, entry);
 304
 305         return (fnh);
 306 }
 307
 308 static void
 309 fec_nh_del(struct fec_nh *fnh)
 310 {
 311         LIST_REMOVE(fnh, entry);
 312         free(fnh);
 313 }
 314
 315 void
 316 lde_kernel_insert(struct fec *fec, int af, union ldpd_addr *nexthop,
 317     ifindex_t ifindex, uint8_t priority, int connected, void *data)
 318 {
 319         struct fec_node         *fn;
 320         struct fec_nh           *fnh;
 321
 322         fn = (struct fec_node *)fec_find(&ft, fec);
 323         if (fn == NULL)
 324                 fn = fec_add(fec);
 325         if (data)
 326                 fn->data = data;
 327
 328         fnh = fec_nh_find(fn, af, nexthop, ifindex, priority);
 329         if (fnh == NULL)
 330                 fnh = fec_nh_add(fn, af, nexthop, ifindex, priority);
 331         fnh->flags |= F_FEC_NH_NEW;
 332         if (connected)
 333                 fnh->flags |= F_FEC_NH_CONNECTED;
 334 }
 335
 336 void
 337 lde_kernel_remove(struct fec *fec, int af, union ldpd_addr *nexthop,
 338     ifindex_t ifindex, uint8_t priority)
 339 {
 340         struct fec_node         *fn;
 341         struct fec_nh           *fnh;
 342
 343         fn = (struct fec_node *)fec_find(&ft, fec);
 344         if (fn == NULL)
 345                 /* route lost */
 346                 return;
 347         fnh = fec_nh_find(fn, af, nexthop, ifindex, priority);
 348         if (fnh == NULL)
 349                 /* route lost */
 350                 return;
 351
 352         lde_send_delete_klabel(fn, fnh);
 353         fec_nh_del(fnh);
 354 }
 355
 356 /*
 357  * Whenever a route is changed, zebra advertises its new version without
 358  * withdrawing the old one. So, after processing a ZEBRA_REDISTRIBUTE_IPV[46]_ADD
 359  * message, we need to check for nexthops that were removed and, for each of
 360  * them (if any), withdraw the associated labels from zebra.
 361  */
 362 void
 363 lde_kernel_update(struct fec *fec)
 364 {
 365         struct fec_node         *fn;
 366         struct fec_nh           *fnh, *safe;
 367         struct lde_nbr          *ln;
 368         struct lde_map          *me;
 369
 370         fn = (struct fec_node *)fec_find(&ft, fec);
 371         if (fn == NULL)
 372                 return;
 373
 374         LIST_FOREACH_SAFE(fnh, &fn->nexthops, entry, safe) {
 375                 if (fnh->flags & F_FEC_NH_NEW)
 376                         fnh->flags &= ~F_FEC_NH_NEW;
 377                 else {
 378                         lde_send_delete_klabel(fn, fnh);
 379                         fec_nh_del(fnh);
 380                 }
 381         }
 382
 383         if (LIST_EMPTY(&fn->nexthops)) {
 384                 RB_FOREACH(ln, nbr_tree, &lde_nbrs)
 385                         lde_send_labelwithdraw(ln, fn, NULL, NULL);
 386                 fn->data = NULL;
 387
 388                 /*
 389                  * Do not deallocate the local label now, do that only in the
 390                  * LIB garbage collector. This will prevent ldpd from changing
 391                  * the input label of some prefixes too often when running on
 392                  * an unstable network. Also, restart the garbage collector
 393                  * timer so that labels are deallocated only when the network
 394                  * is stabilized.
 395                  */
 396                 lde_gc_start_timer();
 397         } else {
 398                 fn->local_label = lde_update_label(fn);
 399                 if (fn->local_label != NO_LABEL && RB_EMPTY(&fn->upstream))
 400                         /* FEC.1: perform lsr label distribution procedure */
 401                         RB_FOREACH(ln, nbr_tree, &lde_nbrs)
 402                                 lde_send_labelmapping(ln, fn, 1);
 403         }
 404
 405         LIST_FOREACH(fnh, &fn->nexthops, entry) {
 406                 lde_send_change_klabel(fn, fnh);
 407
 408                 switch (fn->fec.type) {
 409                 case FEC_TYPE_IPV4:
 410                 case FEC_TYPE_IPV6:
 411                         ln = lde_nbr_find_by_addr(fnh->af, &fnh->nexthop);
 412                         break;
 413                 case FEC_TYPE_PWID:
 414                         ln = lde_nbr_find_by_lsrid(fn->fec.u.pwid.lsr_id);
 415                         break;
 416                 default:
 417                         ln = NULL;
 418                         break;
 419                 }
 420
 421                 if (ln) {
 422                         /* FEC.2  */
 423                         me = (struct lde_map *)fec_find(&ln->recv_map, &fn->fec);
 424                         if (me)
 425                                 /* FEC.5 */
 426                                 lde_check_mapping(&me->map, ln);
 427                 }
 428         }
 429 }
 430
 431 void
 432 lde_check_mapping(struct map *map, struct lde_nbr *ln)
 433 {
 434         struct fec               fec;
 435         struct fec_node         *fn;
 436         struct fec_nh           *fnh;
 437         struct lde_req          *lre;
 438         struct lde_map          *me;
 439         struct l2vpn_pw         *pw;
 440
 441         lde_map2fec(map, ln->id, &fec);
 442
 443         switch (fec.type) {
 444         case FEC_TYPE_IPV4:
 445                 if (lde_acl_check(ldeconf->ipv4.acl_label_accept_from,
 446                     AF_INET, (union ldpd_addr *)&ln->id, 32) != FILTER_PERMIT)
 447                         return;
 448                 if (lde_acl_check(ldeconf->ipv4.acl_label_accept_for,
 449                     AF_INET, (union ldpd_addr *)&fec.u.ipv4.prefix,
 450                     fec.u.ipv4.prefixlen) != FILTER_PERMIT)
 451                         return;
 452                 break;
 453         case FEC_TYPE_IPV6:
 454                 if (lde_acl_check(ldeconf->ipv6.acl_label_accept_from,
 455                     AF_INET, (union ldpd_addr *)&ln->id, 32) != FILTER_PERMIT)
 456                         return;
 457                 if (lde_acl_check(ldeconf->ipv6.acl_label_accept_for,
 458                     AF_INET6, (union ldpd_addr *)&fec.u.ipv6.prefix,
 459                     fec.u.ipv6.prefixlen) != FILTER_PERMIT)
 460                         return;
 461                 break;
 462         default:
 463                 break;
 464         }
 465
 466         fn = (struct fec_node *)fec_find(&ft, &fec);
 467         if (fn == NULL)
 468                 fn = fec_add(&fec);
 469
 470         /* LMp.1: first check if we have a pending request running */
 471         lre = (struct lde_req *)fec_find(&ln->sent_req, &fn->fec);
 472         if (lre)
 473                 /* LMp.2: delete record of outstanding label request */
 474                 lde_req_del(ln, lre, 1);
 475
 476         /* RFC 4447 control word and status tlv negotiation */
 477         if (map->type == MAP_TYPE_PWID && l2vpn_pw_negotiate(ln, fn, map))
 478                 return;
 479
 480         /*
 481          * LMp.3 - LMp.8: loop detection - unnecessary for frame-mode
 482          * mpls networks.
 483          */
 484
 485         /* LMp.9 */
 486         me = (struct lde_map *)fec_find(&ln->recv_map, &fn->fec);
 487         if (me) {
 488                 /* LMp.10 */
 489                 if (me->map.label != map->label && lre == NULL) {
 490                         /* LMp.10a */
 491                         lde_send_labelrelease(ln, fn, NULL, me->map.label);
 492
 493                         /*
 494                          * Can not use lde_nbr_find_by_addr() because there's
 495                          * the possibility of multipath.
 496                          */
 497                         LIST_FOREACH(fnh, &fn->nexthops, entry) {
 498                                 if (lde_address_find(ln, fnh->af,
 499                                     &fnh->nexthop) == NULL)
 500                                         continue;
 501
 502                                 lde_send_delete_klabel(fn, fnh);
 503                                 fnh->remote_label = NO_LABEL;
 504                         }
 505                 }
 506         }
 507
 508         /*
 509          * LMp.11 - 12: consider multiple nexthops in order to
 510          * support multipath
 511          */
 512         LIST_FOREACH(fnh, &fn->nexthops, entry) {
 513                 /* LMp.15: install FEC in FIB */
 514                 switch (fec.type) {
 515                 case FEC_TYPE_IPV4:
 516                 case FEC_TYPE_IPV6:
 517                         if (!lde_address_find(ln, fnh->af, &fnh->nexthop))
 518                                 continue;
 519
 520                         fnh->remote_label = map->label;
 521                         lde_send_change_klabel(fn, fnh);
 522                         break;
 523                 case FEC_TYPE_PWID:
 524                         pw = (struct l2vpn_pw *) fn->data;
 525                         if (pw == NULL)
 526                                 continue;
 527
 528                         pw->remote_group = map->fec.pwid.group_id;
 529                         if (map->flags & F_MAP_PW_IFMTU)
 530                                 pw->remote_mtu = map->fec.pwid.ifmtu;
 531                         if (map->flags & F_MAP_PW_STATUS)
 532                                 pw->remote_status = map->pw_status;
 533                         fnh->remote_label = map->label;
 534                         if (l2vpn_pw_ok(pw, fnh))
 535                                 lde_send_change_klabel(fn, fnh);
 536                         break;
 537                 default:
 538                         break;
 539                 }
 540         }
 541         /* LMp.13 & LMp.16: Record the mapping from this peer */
 542         if (me == NULL)
 543                 me = lde_map_add(ln, fn, 0);
 544         me->map = *map;
 545
 546         /*
 547          * LMp.17 - LMp.27 are unnecessary since we don't need to implement
 548          * loop detection. LMp.28 - LMp.30 are unnecessary because we are
 549          * merging capable.
 550          */
 551 }
 552
 553 void
 554 lde_check_request(struct map *map, struct lde_nbr *ln)
 555 {
 556         struct fec       fec;
 557         struct lde_req  *lre;
 558         struct fec_node *fn;
 559         struct fec_nh   *fnh;
 560
 561         /* wildcard label request */
 562         if (map->type == MAP_TYPE_TYPED_WCARD) {
 563                 lde_check_request_wcard(map, ln);
 564                 return;
 565         }
 566
 567         /* LRq.1: skip loop detection (not necessary) */
 568
 569         /* LRq.2: is there a next hop for fec? */
 570         lde_map2fec(map, ln->id, &fec);
 571         fn = (struct fec_node *)fec_find(&ft, &fec);
 572         if (fn == NULL || LIST_EMPTY(&fn->nexthops)) {
 573                 /* LRq.5: send No Route notification */
 574                 lde_send_notification(ln, S_NO_ROUTE, map->msg_id,
 575                     htons(MSG_TYPE_LABELREQUEST));
 576                 return;
 577         }
 578
 579         /* LRq.3: is MsgSource the next hop? */
 580         LIST_FOREACH(fnh, &fn->nexthops, entry) {
 581                 switch (fec.type) {
 582                 case FEC_TYPE_IPV4:
 583                 case FEC_TYPE_IPV6:
 584                         if (!lde_address_find(ln, fnh->af, &fnh->nexthop))
 585                                 continue;
 586
 587                         /* LRq.4: send Loop Detected notification */
 588                         lde_send_notification(ln, S_LOOP_DETECTED, map->msg_id,
 589                             htons(MSG_TYPE_LABELREQUEST));
 590                         return;
 591                 default:
 592                         break;
 593                 }
 594         }
 595
 596         /* LRq.6: first check if we have a pending request running */
 597         lre = (struct lde_req *)fec_find(&ln->recv_req, &fn->fec);
 598         if (lre != NULL)
 599                 /* LRq.7: duplicate request */
 600                 return;
 601
 602         /* LRq.8: record label request */
 603         lre = lde_req_add(ln, &fn->fec, 0);
 604         if (lre != NULL)
 605                 lre->msg_id = ntohl(map->msg_id);
 606
 607         /* LRq.9: perform LSR label distribution */
 608         lde_send_labelmapping(ln, fn, 1);
 609
 610         /*
 611          * LRq.10: do nothing (Request Never) since we use liberal
 612          * label retention.
 613          * LRq.11 - 12 are unnecessary since we are merging capable.
 614          */
 615 }
 616
 617 void
 618 lde_check_request_wcard(struct map *map, struct lde_nbr *ln)
 619 {
 620         struct fec      *f;
 621         struct fec_node *fn;
 622         struct lde_req  *lre;
 623
 624         RB_FOREACH(f, fec_tree, &ft) {
 625                 fn = (struct fec_node *)f;
 626
 627                 /* only a typed wildcard is possible here */
 628                 if (lde_wildcard_apply(map, &fn->fec, NULL) == 0)
 629                         continue;
 630
 631                 /* LRq.2: is there a next hop for fec? */
 632                 if (LIST_EMPTY(&fn->nexthops))
 633                         continue;
 634
 635                 /* LRq.6: first check if we have a pending request running */
 636                 lre = (struct lde_req *)fec_find(&ln->recv_req, &fn->fec);
 637                 if (lre != NULL)
 638                         /* LRq.7: duplicate request */
 639                         continue;
 640
 641                 /* LRq.8: record label request */
 642                 lre = lde_req_add(ln, &fn->fec, 0);
 643                 if (lre != NULL)
 644                         lre->msg_id = ntohl(map->msg_id);
 645
 646                 /* LRq.9: perform LSR label distribution */
 647                 lde_send_labelmapping(ln, fn, 1);
 648         }
 649 }
 650
 651 void
 652 lde_check_release(struct map *map, struct lde_nbr *ln)
 653 {
 654         struct fec               fec;
 655         struct fec_node         *fn;
 656         struct lde_wdraw        *lw;
 657         struct lde_map          *me;
 658         struct fec              *pending_map;
 659
 660         /* wildcard label release */
 661         if (map->type == MAP_TYPE_WILDCARD ||
 662             map->type == MAP_TYPE_TYPED_WCARD ||
 663             (map->type == MAP_TYPE_PWID && !(map->flags & F_MAP_PW_ID))) {
 664                 lde_check_release_wcard(map, ln);
 665                 return;
 666         }
 667
 668         lde_map2fec(map, ln->id, &fec);
 669         fn = (struct fec_node *)fec_find(&ft, &fec);
 670         /* LRl.1: does FEC match a known FEC? */
 671         if (fn == NULL)
 672                 return;
 673
 674         /* LRl.6: check sent map list and remove it if available */
 675         me = (struct lde_map *)fec_find(&ln->sent_map, &fn->fec);
 676         if (me && (map->label == NO_LABEL || map->label == me->map.label))
 677                 lde_map_del(ln, me, 1);
 678
 679         /* LRl.3: first check if we have a pending withdraw running */
 680         lw = (struct lde_wdraw *)fec_find(&ln->sent_wdraw, &fn->fec);
 681         if (lw && (map->label == NO_LABEL || map->label == lw->label)) {
 682                 /* LRl.4: delete record of outstanding label withdraw */
 683                 lde_wdraw_del(ln, lw);
 684
 685                 /* send pending label mapping if any */
 686                 pending_map = fec_find(&ln->sent_map_pending, &fn->fec);
 687                 if (pending_map) {
 688                         lde_send_labelmapping(ln, fn, 1);
 689                         lde_map_pending_del(ln, pending_map);
 690                 }
 691         }
 692
 693         /*
 694          * LRl.11 - 13 are unnecessary since we remove the label from
 695          * forwarding/switching as soon as the FEC is unreachable.
 696          */
 697 }
 698
 699 void
 700 lde_check_release_wcard(struct map *map, struct lde_nbr *ln)
 701 {
 702         struct fec              *f;
 703         struct fec_node         *fn;
 704         struct lde_wdraw        *lw;
 705         struct lde_map          *me;
 706         struct fec              *pending_map;
 707
 708         RB_FOREACH(f, fec_tree, &ft) {
 709                 fn = (struct fec_node *)f;
 710                 me = (struct lde_map *)fec_find(&ln->sent_map, &fn->fec);
 711
 712                 /* LRl.1: does FEC match a known FEC? */
 713                 if (lde_wildcard_apply(map, &fn->fec, me) == 0)
 714                         continue;
 715
 716                 /* LRl.6: check sent map list and remove it if available */
 717                 if (me &&
 718                     (map->label == NO_LABEL || map->label == me->map.label))
 719                         lde_map_del(ln, me, 1);
 720
 721                 /* LRl.3: first check if we have a pending withdraw running */
 722                 lw = (struct lde_wdraw *)fec_find(&ln->sent_wdraw, &fn->fec);
 723                 if (lw && (map->label == NO_LABEL || map->label == lw->label)) {
 724                         /* LRl.4: delete record of outstanding lbl withdraw */
 725                         lde_wdraw_del(ln, lw);
 726
 727                         /* send pending label mapping if any */
 728                         pending_map = fec_find(&ln->sent_map_pending, &fn->fec);
 729                         if (pending_map) {
 730                                 lde_send_labelmapping(ln, fn, 1);
 731                                 lde_map_pending_del(ln, pending_map);
 732                         }
 733                 }
 734
 735                 /*
 736                  * LRl.11 - 13 are unnecessary since we remove the label from
 737                  * forwarding/switching as soon as the FEC is unreachable.
 738                  */
 739         }
 740 }
 741
 742 void
 743 lde_check_withdraw(struct map *map, struct lde_nbr *ln)
 744 {
 745         struct fec               fec;
 746         struct fec_node         *fn;
 747         struct fec_nh           *fnh;
 748         struct lde_map          *me;
 749         struct l2vpn_pw         *pw;
 750
 751         /* wildcard label withdraw */
 752         if (map->type == MAP_TYPE_WILDCARD ||
 753             map->type == MAP_TYPE_TYPED_WCARD ||
 754             (map->type == MAP_TYPE_PWID && !(map->flags & F_MAP_PW_ID))) {
 755                 lde_check_withdraw_wcard(map, ln);
 756                 return;
 757         }
 758
 759         lde_map2fec(map, ln->id, &fec);
 760         fn = (struct fec_node *)fec_find(&ft, &fec);
 761         if (fn == NULL)
 762                 fn = fec_add(&fec);
 763
 764         /* LWd.1: remove label from forwarding/switching use */
 765         LIST_FOREACH(fnh, &fn->nexthops, entry) {
 766                 switch (fec.type) {
 767                 case FEC_TYPE_IPV4:
 768                 case FEC_TYPE_IPV6:
 769                         if (!lde_address_find(ln, fnh->af, &fnh->nexthop))
 770                                 continue;
 771                         break;
 772                 case FEC_TYPE_PWID:
 773                         pw = (struct l2vpn_pw *) fn->data;
 774                         if (pw == NULL)
 775                                 continue;
 776                         break;
 777                 default:
 778                         break;
 779                 }
 780                 if (map->label != NO_LABEL && map->label != fnh->remote_label)
 781                         continue;
 782
 783                 lde_send_delete_klabel(fn, fnh);
 784                 fnh->remote_label = NO_LABEL;
 785         }
 786
 787         /* LWd.2: send label release */
 788         lde_send_labelrelease(ln, fn, NULL, map->label);
 789
 790         /* LWd.3: check previously received label mapping */
 791         me = (struct lde_map *)fec_find(&ln->recv_map, &fn->fec);
 792         if (me && (map->label == NO_LABEL || map->label == me->map.label))
 793                 /* LWd.4: remove record of previously received lbl mapping */
 794                 lde_map_del(ln, me, 0);
 795 }
 796
 797 void
 798 lde_check_withdraw_wcard(struct map *map, struct lde_nbr *ln)
 799 {
 800         struct fec      *f;
 801         struct fec_node *fn;
 802         struct fec_nh   *fnh;
 803         struct lde_map  *me;
 804
 805         /* LWd.2: send label release */
 806         lde_send_labelrelease(ln, NULL, map, map->label);
 807
 808         RB_FOREACH(f, fec_tree, &ft) {
 809                 fn = (struct fec_node *)f;
 810                 me = (struct lde_map *)fec_find(&ln->recv_map, &fn->fec);
 811
 812                 if (lde_wildcard_apply(map, &fn->fec, me) == 0)
 813                         continue;
 814
 815                 /* LWd.1: remove label from forwarding/switching use */
 816                 LIST_FOREACH(fnh, &fn->nexthops, entry) {
 817                         switch (f->type) {
 818                         case FEC_TYPE_IPV4:
 819                         case FEC_TYPE_IPV6:
 820                                 if (!lde_address_find(ln, fnh->af,
 821                                     &fnh->nexthop))
 822                                         continue;
 823                                 break;
 824                         case FEC_TYPE_PWID:
 825                                 if (f->u.pwid.lsr_id.s_addr != ln->id.s_addr)
 826                                         continue;
 827                                 break;
 828                         default:
 829                                 break;
 830                         }
 831                         if (map->label != NO_LABEL && map->label !=
 832                             fnh->remote_label)
 833                                 continue;
 834
 835                         lde_send_delete_klabel(fn, fnh);
 836                         fnh->remote_label = NO_LABEL;
 837                 }
 838
 839                 /* LWd.3: check previously received label mapping */
 840                 if (me && (map->label == NO_LABEL ||
 841                     map->label == me->map.label))
 842                         /*
 843                          * LWd.4: remove record of previously received
 844                          * label mapping
 845                          */
 846                         lde_map_del(ln, me, 0);
 847         }
 848 }
 849
 850 int
 851 lde_wildcard_apply(struct map *wcard, struct fec *fec, struct lde_map *me)
 852 {
 853         switch (wcard->type) {
 854         case MAP_TYPE_WILDCARD:
 855                 /* full wildcard */
 856                 return (1);
 857         case MAP_TYPE_TYPED_WCARD:
 858                 switch (wcard->fec.twcard.type) {
 859                 case MAP_TYPE_PREFIX:
 860                         if (wcard->fec.twcard.u.prefix_af == AF_INET &&
 861                             fec->type != FEC_TYPE_IPV4)
 862                                 return (0);
 863                         if (wcard->fec.twcard.u.prefix_af == AF_INET6 &&
 864                             fec->type != FEC_TYPE_IPV6)
 865                                 return (0);
 866                         return (1);
 867                 case MAP_TYPE_PWID:
 868                         if (fec->type != FEC_TYPE_PWID)
 869                                 return (0);
 870                         if (wcard->fec.twcard.u.pw_type != PW_TYPE_WILDCARD &&
 871                             wcard->fec.twcard.u.pw_type != fec->u.pwid.type)
 872                                 return (0);
 873                         return (1);
 874                 default:
 875                         fatalx("lde_wildcard_apply: unexpected fec type");
 876                 }
 877                 break;
 878         case MAP_TYPE_PWID:
 879                 /* RFC4447 pw-id group wildcard */
 880                 if (fec->type != FEC_TYPE_PWID)
 881                         return (0);
 882                 if (fec->u.pwid.type != wcard->fec.pwid.type)
 883                         return (0);
 884                 if (me == NULL || (me->map.fec.pwid.group_id !=
 885                     wcard->fec.pwid.group_id))
 886                         return (0);
 887                 return (1);
 888         default:
 889                 fatalx("lde_wildcard_apply: unexpected fec type");
 890         }
 891 }
 892
 893 /* gabage collector timer: timer to remove dead entries from the LIB */
 894
 895 /* ARGSUSED */
 896 int
 897 lde_gc_timer(struct thread *thread)
 898 {
 899         struct fec      *fec, *safe;
 900         struct fec_node *fn;
 901         int              count = 0;
 902
 903         RB_FOREACH_SAFE(fec, fec_tree, &ft, safe) {
 904                 fn = (struct fec_node *) fec;
 905
 906                 if (!LIST_EMPTY(&fn->nexthops) ||
 907                     !RB_EMPTY(&fn->downstream) ||
 908                     !RB_EMPTY(&fn->upstream))
 909                         continue;
 910
 911                 fec_remove(&ft, &fn->fec);
 912                 free(fn);
 913                 count++;
 914         }
 915
 916         if (count > 0)
 917                 log_debug("%s: %u entries removed", __func__, count);
 918
 919         lde_gc_start_timer();
 920
 921         return (0);
 922 }
 923
 924 void
 925 lde_gc_start_timer(void)
 926 {
 927         THREAD_TIMER_OFF(gc_timer);
 928         gc_timer = NULL;
 929         thread_add_timer(master, lde_gc_timer, NULL, LDE_GC_INTERVAL,
 930                          &gc_timer);
 931 }
 932
 933 void
 934 lde_gc_stop_timer(void)
 935 {
 936         THREAD_TIMER_OFF(gc_timer);
 937 }