ldp/ldp_fec.c

   1
   2 /*
   3  *  Copyright (C) James R. Leu 2000
   4  *  jleu@mindspring.com
   5  *
   6  *  This software is covered under the LGPL, for more
   7  *  info check out http://www.gnu.org/copyleft/lgpl.html
   8  */
   9
  10 #include "ldp_struct.h"
  11 #include "ldp_fec.h"
  12 #include "ldp_if.h"
  13 #include "ldp_attr.h"
  14 #include "ldp_addr.h"
  15 #include "ldp_nexthop.h"
  16 #include "ldp_session.h"
  17 #include "ldp_inlabel.h"
  18 #include "ldp_outlabel.h"
  19 #include "ldp_global.h"
  20 #include "ldp_label_mapping.h"
  21 #include "ldp_label_request.h"
  22 #include "ldp_label_abort.h"
  23 #include "ldp_label_rel_with.h"
  24 #include "mpls_assert.h"
  25 #include "mpls_compare.h"
  26 #include "mpls_mm_impl.h"
  27 #include "mpls_tree_impl.h"
  28 #include "mpls_policy_impl.h"
  29 #include "mpls_trace_impl.h"
  30
  31 #if MPLS_USE_LSR
  32 #include "lsr_cfg.h"
  33 #else
  34 #include "mpls_mpls_impl.h"
  35 #endif
  36
  37 static uint32_t _ldp_fec_next_index = 1;
  38 static uint32_t _ldp_fec_get_next_index();
  39
  40 ldp_nexthop *ldp_fec_nexthop_find(ldp_fec *f, mpls_nexthop *n)
  41 {
  42   ldp_nexthop *nh = NULL;
  43
  44   MPLS_ASSERT(f && n);
  45
  46   nh = MPLS_LIST_HEAD(&f->nh_root);
  47   do {
  48     if (!mpls_nexthop_compare(&nh->info, n)) {
  49       return nh;
  50     }
  51     nh = MPLS_LIST_NEXT(&f->nh_root, nh, _fec);
  52   } while((nh = MPLS_LIST_NEXT(&f->nh_root, nh, _fec)));
  53
  54   return NULL;
  55 }
  56
  57 ldp_fec *ldp_fec_find(ldp_global *g, mpls_fec *fec)
  58 {
  59   ldp_fec *f = NULL;
  60   uint32_t key;
  61   uint8_t len;
  62
  63   switch(fec->type) {
  64     case MPLS_FEC_PREFIX:
  65       key = fec->u.prefix.network.u.ipv4;
  66       len = fec->u.prefix.length;
  67       break;
  68     case MPLS_FEC_HOST:
  69       key = fec->u.host.u.ipv4;
  70       len = 32;
  71     case MPLS_FEC_L2CC:
  72       if (ldp_global_find_fec(g, fec, &f) == MPLS_SUCCESS) {
  73         return f;
  74       }
  75       return NULL;
  76     default:
  77       MPLS_ASSERT(0);
  78   }
  79
  80   if (mpls_tree_get(g->fec_tree, key, len, (void **)&f) != MPLS_SUCCESS) {
  81     return NULL;
  82   }
  83   return f;
  84 }
  85
  86 mpls_return_enum ldp_fec_insert2(ldp_global *g, ldp_fec * fec)
  87 {
  88   uint32_t key;
  89   uint8_t len;
  90
  91   MPLS_ASSERT(MPLS_LIST_EMPTY(&fec->nh_root));
  92
  93   switch(fec->info.type) {
  94     case MPLS_FEC_PREFIX:
  95       key = fec->info.u.prefix.network.u.ipv4;
  96       len = fec->info.u.prefix.length;
  97       break;
  98     case MPLS_FEC_HOST:
  99       key = fec->info.u.host.u.ipv4;
 100       len = 32;
 101     case MPLS_FEC_L2CC:
 102       /* they had better insert it into the global list */
 103       return MPLS_SUCCESS;
 104     default:
 105       MPLS_ASSERT(0);
 106   }
 107
 108   /* hold it since it is going in the tree */
 109   MPLS_REFCNT_HOLD(fec);
 110
 111   if (mpls_tree_insert(g->fec_tree, key, len, (void *)fec) != MPLS_SUCCESS) {
 112     LDP_PRINT(g->user_data, "ldp_fec_insert: error adding addr\n");
 113
 114     /* delete the refcnt we just took */
 115     MPLS_REFCNT_RELEASE(fec, ldp_fec_delete);
 116     goto ldp_fec_insert2_error;
 117   }
 118   return MPLS_SUCCESS;
 119
 120 ldp_fec_insert2_error:
 121   return MPLS_FATAL;
 122 }
 123
 124 ldp_fec *ldp_fec_insert(ldp_global *g, mpls_fec * fec)
 125 {
 126   ldp_fec *f = NULL;
 127
 128   if ((f = ldp_fec_create()) == NULL) {
 129     LDP_PRINT(g->user_data, "ldp_fec_insert: error creating address\n");
 130     return NULL;
 131   }
 132
 133   mpls_fec2ldp_fec(fec,f);
 134
 135   MPLS_REFCNT_HOLD(f);
 136
 137   if (ldp_fec_insert2(g,f) != MPLS_SUCCESS) {
 138     MPLS_REFCNT_RELEASE(f, ldp_fec_delete);
 139     return NULL;
 140   }
 141   return f;
 142 }
 143
 144 void ldp_fec_remove(ldp_global *g, mpls_fec *fec)
 145 {
 146   ldp_fec *f = NULL;
 147   uint32_t key;
 148   uint8_t len;
 149
 150   switch(fec->type) {
 151     case MPLS_FEC_PREFIX:
 152       key = fec->u.prefix.network.u.ipv4;
 153       len = fec->u.prefix.length;
 154       break;
 155     case MPLS_FEC_HOST:
 156       key = fec->u.host.u.ipv4;
 157       len = 32;
 158     case MPLS_FEC_L2CC:
 159       /* they had better remove it from the global list */
 160       return;
 161     default:
 162       MPLS_ASSERT(0);
 163   }
 164
 165   mpls_tree_remove(g->fec_tree, key, len, (void **)&f);
 166   if (!f) {
 167     return;
 168   }
 169
 170   MPLS_ASSERT(MPLS_LIST_EMPTY(&f->nh_root));
 171
 172   MPLS_REFCNT_RELEASE(f, ldp_fec_delete);
 173 }
 174
 175 mpls_bool ldp_fec_empty(ldp_fec *fec)
 176 {
 177   if (MPLS_LIST_EMPTY(&fec->fs_root_us) &&
 178       MPLS_LIST_EMPTY(&fec->fs_root_ds)) {
 179     return MPLS_BOOL_TRUE;
 180   }
 181   return MPLS_BOOL_FALSE;
 182 }
 183
 184 mpls_return_enum ldp_fec_find_nexthop_index(ldp_fec *f, int index,
 185   ldp_nexthop **n)
 186 {
 187   ldp_nexthop *nh = NULL;
 188
 189   MPLS_ASSERT(f);
 190
 191   if (index > 0) {
 192
 193     /* because we sort our inserts by index, this lets us know
 194        if we've "walked" past the end of the list */
 195
 196     nh = MPLS_LIST_TAIL(&f->nh_root);
 197     if (!nh || nh->index < index) {
 198       *n = NULL;
 199       return MPLS_END_OF_LIST;
 200     }
 201
 202     nh = MPLS_LIST_HEAD(&f->nh_root);
 203     do {
 204       if (nh->index == index) {
 205         *n = nh;
 206         return MPLS_SUCCESS;
 207       }
 208     } while((nh = MPLS_LIST_NEXT(&f->nh_root, nh, _fec)));
 209   }
 210   *n = NULL;
 211   return MPLS_FAILURE;
 212 }
 213
 214 mpls_return_enum ldp_fec_add_nexthop(ldp_global *g, ldp_fec * f,
 215   ldp_nexthop * nh)
 216 {
 217   MPLS_ASSERT(f && nh);
 218
 219   MPLS_REFCNT_HOLD(nh);
 220   MPLS_LIST_ADD_HEAD(&f->nh_root, nh, _fec, ldp_nexthop);
 221
 222   ldp_nexthop_add_fec(nh, f);
 223
 224   if (nh->type & MPLS_NH_IP) {
 225     ldp_addr *addr = NULL;
 226     if (!(addr = ldp_addr_find(g, &nh->info.ip))) {
 227       if (!(addr = ldp_addr_insert(g, &nh->info.ip))) {
 228         goto ldp_fec_add_nexthop_error;
 229       }
 230     }
 231
 232     ldp_addr_add_nexthop(addr, nh);
 233   }
 234
 235   if (nh->type & MPLS_NH_IF) {
 236     ldp_if *iff = NULL;
 237     if (!(iff = ldp_global_find_if_handle(g, nh->info.if_handle))) {
 238       if (!(iff = ldp_if_insert(g, nh->info.if_handle))) {
 239         goto ldp_fec_add_nexthop_error;
 240       }
 241     }
 242
 243     ldp_if_add_nexthop(iff, nh);
 244   }
 245
 246   if (nh->type & MPLS_NH_OUTSEGMENT) {
 247     ldp_outlabel *out = NULL;
 248     MPLS_ASSERT((out = ldp_global_find_outlabel_handle(g,
 249       nh->info.outsegment_handle)));
 250
 251     ldp_outlabel_add_nexthop(out, nh);
 252   }
 253   return MPLS_SUCCESS;
 254
 255 ldp_fec_add_nexthop_error:
 256
 257   ldp_fec_del_nexthop(g, f, nh);
 258   return MPLS_FATAL;
 259 }
 260
 261 void ldp_fec_del_nexthop(ldp_global *g, ldp_fec * f, ldp_nexthop *nh)
 262 {
 263   MPLS_ASSERT(f && nh);
 264
 265   if (nh->addr) {
 266     ldp_addr_del_nexthop(g, nh->addr, nh);
 267   }
 268   if (nh->iff) {
 269     ldp_if_del_nexthop(g, nh->iff, nh);
 270   }
 271   if (nh->outlabel) {
 272     ldp_outlabel_del_nexthop(nh->outlabel, nh);
 273   }
 274
 275   MPLS_LIST_REMOVE(&f->nh_root, nh, _fec);
 276   ldp_nexthop_del_fec(nh);
 277
 278   MPLS_REFCNT_RELEASE(nh, ldp_nexthop_delete);
 279 }
 280
 281 mpls_return_enum ldp_fec_process_add(ldp_global * g, ldp_fec * f,
 282   ldp_nexthop *nh)
 283 {
 284   ldp_session *nh_session = NULL;
 285   ldp_session *peer = NULL;
 286   ldp_attr *ds_attr = NULL;
 287   ldp_attr *us_attr = NULL;
 288   mpls_bool egress = MPLS_BOOL_FALSE;
 289   ldp_outlabel *out;
 290
 291   LDP_ENTER(g->user_data, "ldp_fec_process_add");
 292
 293   /*
 294    * find the info about the next hop for this FEC
 295    */
 296   nh_session = ldp_session_for_nexthop(nh);
 297
 298   if (nh_session) {
 299     ds_attr = ldp_attr_find_downstream_state2(g, nh_session, f,
 300       LDP_LSP_STATE_MAP_RECV);
 301     if (ds_attr && !ds_attr->outlabel) {
 302       out = ldp_outlabel_create_complete(g, nh_session, ds_attr, nh);
 303       if (!out) {
 304         return MPLS_FAILURE;
 305       }
 306       ds_attr->outlabel = out;
 307     }
 308   }
 309
 310   /*
 311    * for every peer except the nh hop peer, check to see if we need to
 312    * send a mapping
 313    */
 314   peer = MPLS_LIST_HEAD(&g->session);
 315   while (peer != NULL) {        /* FEC.1 */
 316     if ((peer->state != LDP_STATE_OPERATIONAL) ||
 317       (nh_session && peer->index == nh_session->index)) {
 318       goto next_peer;
 319     }
 320     /* have I already sent a mapping for FEC to peer */
 321     if ((us_attr = ldp_attr_find_upstream_state2(g, peer, f,
 322       LDP_LSP_STATE_MAP_SENT))) {
 323       /* yep, don't send another */
 324       if (ds_attr) {
 325         if (ldp_inlabel_add_outlabel(g, us_attr->inlabel,
 326           ds_attr->outlabel) != MPLS_SUCCESS) {
 327           return MPLS_FAILURE;
 328         }
 329       }
 330       goto next_peer;
 331     }
 332
 333     if (peer->oper_distribution_mode == LDP_DISTRIBUTION_UNSOLICITED) {
 334       if (g->lsp_control_mode == LDP_CONTROL_INDEPENDENT) {
 335         us_attr =
 336           ldp_attr_find_upstream_state2(g, peer, f, LDP_LSP_STATE_REQ_RECV);
 337
 338         /* FEC.1.DUI3,4 */
 339         if (ldp_label_mapping_with_xc(g, peer, f, &us_attr, ds_attr) !=
 340           MPLS_SUCCESS) {
 341           if (!us_attr->in_tree) {
 342             ldp_attr_remove_complete(g, us_attr, MPLS_BOOL_FALSE);
 343           }
 344           goto next_peer;
 345         }
 346       } else {
 347         /*
 348          *LDP_CONTROL_ORDERED
 349          */
 350
 351         if (ds_attr || egress == MPLS_BOOL_TRUE) { /* FEC.1.DUO2 */
 352           if (!(us_attr = ldp_attr_create(&f->info))) {
 353             return MPLS_FAILURE;
 354           }
 355           /* FEC.1.DUO3-4 */
 356           if ((egress == MPLS_BOOL_TRUE) && (mpls_policy_egress_check(
 357             g->user_data, &f->info, &nh->info) == MPLS_BOOL_TRUE)) {
 358             goto next_peer;
 359           }
 360
 361           if (ldp_label_mapping_with_xc(g, peer, f, &us_attr, ds_attr) !=
 362             MPLS_SUCCESS) {
 363             return MPLS_FAILURE;
 364           }
 365         }
 366       }
 367     }
 368   next_peer:
 369     peer = MPLS_LIST_NEXT(&g->session, peer, _global);
 370   }
 371
 372   if (ds_attr) {                /* FEC.2 */
 373     if (ldp_label_mapping_process(g, nh_session, NULL, NULL, ds_attr, f) ==
 374       MPLS_FAILURE) { /* FEC.5 */
 375       return MPLS_FAILURE;
 376     }
 377     return MPLS_SUCCESS;
 378   }
 379
 380   /*
 381    * LDP_DISTRIBUTION_ONDEMAND
 382    */
 383   /* FEC.3 */
 384   if (nh_session &&
 385       nh_session->oper_distribution_mode == LDP_DISTRIBUTION_ONDEMAND) {
 386     /* assume we're always "request when needed" */
 387     ds_attr = NULL;
 388     if (ldp_label_request_for_xc(g, nh_session, &f->info, NULL, &ds_attr) ==
 389       MPLS_FAILURE) { /* FEC.4 */
 390       return MPLS_FAILURE;
 391     }
 392   }
 393
 394   LDP_EXIT(g->user_data, "ldp_fec_process_add");
 395
 396   return MPLS_SUCCESS;           /* FEC.6 */
 397 }
 398
 399 mpls_return_enum ldp_fec_process_change(ldp_global * g, ldp_fec * f,
 400   ldp_nexthop *nh, ldp_session *nh_session_old) {
 401   ldp_session *peer = NULL;
 402   ldp_attr *us_attr = NULL;
 403   ldp_attr *ds_attr = NULL;
 404   ldp_session *nh_session_new = NULL;
 405
 406   LDP_ENTER(g->user_data, "ldp_fec_process_change");
 407
 408   /*
 409    * NH 1-5 decide if we need to release an existing mapping
 410    */
 411   ds_attr = ldp_attr_find_downstream_state2(g, nh_session_old, f,
 412       LDP_LSP_STATE_MAP_RECV);
 413   if (!ds_attr) {               /* NH.1 */
 414     goto Detect_Change_Fec_Next_Hop_6;
 415   }
 416
 417   if (ds_attr->ingress == MPLS_BOOL_TRUE) {
 418
 419 #if MPLS_USE_LSR
 420     lsr_ftn ftn;
 421     ftn.outsegment_index = ds_attr->outlabel->info.handle;
 422     memcpy(&ftn.fec, &f->info, sizeof(mpls_fec));
 423     lsr_cfg_ftn_set2(g->lsr_handle, &ftn, LSR_CFG_DEL);
 424 #else
 425     mpls_mpls_fec2out_del(g->mpls_handle, &f->info, &ds_attr->outlabel->info);
 426 #endif
 427     ds_attr->ingress = MPLS_BOOL_FALSE;
 428     ds_attr->outlabel->merge_count--;
 429   }
 430
 431   if (g->label_retention_mode == LDP_RETENTION_LIBERAL) { /* NH.3 */
 432     ldp_attr *us_temp;
 433     us_attr = MPLS_LIST_HEAD(&ds_attr->us_attr_root);
 434     while (us_attr) {
 435       /* need to walk the list in such a way as not to
 436        * "pull the rug out from under me self"
 437        */
 438       us_temp = MPLS_LIST_NEXT(&ds_attr->us_attr_root, us_attr, _ds_attr);
 439       if (us_attr->state == LDP_LSP_STATE_MAP_SENT) {
 440         ldp_inlabel_del_outlabel(g, us_attr->inlabel);  /* NH.2 */
 441         ldp_attr_del_us2ds(us_attr, ds_attr);
 442       }
 443       us_attr = us_temp;
 444     }
 445     goto Detect_Change_Fec_Next_Hop_6;
 446   }
 447
 448   ldp_label_release_send(g, nh_session_old, ds_attr, LDP_NOTIF_NONE); /* NH.4 */
 449   ldp_attr_remove_complete(g, ds_attr, MPLS_BOOL_FALSE); /* NH.2,5 */
 450
 451 Detect_Change_Fec_Next_Hop_6:
 452
 453   /*
 454    * NH 6-9 decides is we need to send a label request abort
 455    */
 456   ds_attr = ldp_attr_find_downstream_state2(g, nh_session_old, f,
 457     LDP_LSP_STATE_REQ_SENT);
 458   if (ds_attr) {               /* NH.6 */
 459     if (g->label_retention_mode != LDP_RETENTION_CONSERVATIVE) { /* NH.7 */
 460       /* NH.8,9 */
 461       if (ldp_label_abort_send(g, nh_session_old, ds_attr) != MPLS_SUCCESS) {
 462         return MPLS_FAILURE;
 463       }
 464     }
 465   }
 466
 467   /*
 468    * NH 10-12 decides if we can use a mapping from our database
 469    */
 470   if (!(nh_session_new = ldp_get_next_hop_session_for_fec2(f,nh))) {
 471     goto Detect_Change_Fec_Next_Hop_16;
 472   }
 473
 474   ds_attr = ldp_attr_find_downstream_state2(g, nh_session_new, f,
 475     LDP_LSP_STATE_MAP_RECV);
 476   if (!ds_attr) {               /* NH.11 */
 477     goto Detect_Change_Fec_Next_Hop_13;
 478   }
 479
 480   if (ldp_label_mapping_process(g, nh_session_new, NULL, NULL, ds_attr, f) !=
 481     MPLS_SUCCESS) { /* NH.12 */
 482     return MPLS_FAILURE;
 483   }
 484   goto Detect_Change_Fec_Next_Hop_20;
 485
 486 Detect_Change_Fec_Next_Hop_13:
 487
 488   /*
 489    * NH 13-15 decides if we need to make a label request
 490    */
 491   if (nh_session_new->oper_distribution_mode == LDP_DISTRIBUTION_ONDEMAND &&
 492     g->label_retention_mode == LDP_RETENTION_CONSERVATIVE) {
 493     /* NH.14-15 */
 494     if (ldp_label_request_for_xc(g, nh_session_new, &f->info, NULL, &ds_attr) !=
 495         MPLS_SUCCESS) {
 496       return MPLS_FAILURE;
 497     }
 498   }
 499   goto Detect_Change_Fec_Next_Hop_20;
 500
 501 Detect_Change_Fec_Next_Hop_16:
 502
 503   peer = MPLS_LIST_HEAD(&g->session);
 504   while (peer) {
 505     if (peer->state == LDP_STATE_OPERATIONAL) {
 506       us_attr = ldp_attr_find_upstream_state2(g, peer, f,
 507         LDP_LSP_STATE_MAP_SENT);
 508       if (us_attr) {    /* NH.17 */
 509         if (ldp_label_withdraw_send(g, peer, us_attr, LDP_NOTIF_NONE) !=
 510           MPLS_SUCCESS) { /* NH.18 */
 511           ldp_attr_remove_complete(g, us_attr, MPLS_BOOL_FALSE);
 512           return MPLS_FAILURE;
 513         }
 514       }
 515     }
 516     peer = MPLS_LIST_NEXT(&g->session, peer, _global);
 517   }
 518
 519 Detect_Change_Fec_Next_Hop_20:
 520
 521   LDP_EXIT(g->user_data, "ldp_fec_process_change");
 522
 523   return MPLS_SUCCESS;
 524 }
 525
 526 ldp_fec *ldp_fec_create()
 527 {
 528   ldp_fec *fec = (ldp_fec *) mpls_malloc(sizeof(ldp_fec));
 529
 530   if (fec != NULL) {
 531     memset(fec, 0, sizeof(ldp_fec));
 532     MPLS_REFCNT_INIT(fec, 0);
 533     MPLS_LIST_ELEM_INIT(fec, _global);
 534     MPLS_LIST_ELEM_INIT(fec, _inlabel);
 535     MPLS_LIST_ELEM_INIT(fec, _outlabel);
 536     MPLS_LIST_ELEM_INIT(fec, _fec);
 537     MPLS_LIST_INIT(&fec->nh_root, ldp_nexthop);
 538     MPLS_LIST_INIT(&fec->fs_root_us, ldp_fs);
 539     MPLS_LIST_INIT(&fec->fs_root_ds, ldp_fs);
 540     fec->info.type = MPLS_FEC_NONE;
 541     fec->index = _ldp_fec_get_next_index();
 542   }
 543   return fec;
 544 }
 545
 546 void mpls_fec2ldp_fec(mpls_fec * a, ldp_fec * b)
 547 {
 548   memcpy(&b->info, a, sizeof(mpls_fec));
 549 }
 550
 551 ldp_fec *ldp_fec_create_host(mpls_inet_addr * host)
 552 {
 553   ldp_fec *fec = ldp_fec_create();
 554
 555   if (fec != NULL) {
 556     fec->info.type = MPLS_FEC_HOST;
 557     memcpy(&fec->info.u.host, host, sizeof(mpls_inet_addr));
 558   }
 559   return fec;
 560 }
 561
 562 ldp_fec *ldp_fec_create_prefix(mpls_inet_addr * prefix, int prefix_len)
 563 {
 564   ldp_fec *fec = ldp_fec_create();
 565
 566   if (fec != NULL) {
 567     fec->info.type = MPLS_FEC_PREFIX;
 568     memcpy(&fec->info.u.prefix.network, prefix, sizeof(mpls_inet_addr));
 569     fec->info.u.prefix.length = prefix_len;
 570   }
 571   return fec;
 572 }
 573
 574 void ldp_fec_delete(ldp_fec * fec)
 575 {
 576   mpls_free(fec);
 577 }
 578
 579 void mpls_fec2fec_tlv(mpls_fec * lf, mplsLdpFecTlv_t * tlv, int i)
 580 {
 581   tlv->fecElArray[i].addressEl.addressFam = 1;
 582
 583   switch (lf->type) {
 584     case MPLS_FEC_PREFIX:
 585       tlv->fecElArray[i].addressEl.type = MPLS_PREFIX_FEC;
 586       tlv->fecElArray[i].addressEl.preLen = lf->u.prefix.length;
 587       tlv->fecElArray[i].addressEl.address = lf->u.prefix.network.u.ipv4;
 588       tlv->fecElemTypes[i] = MPLS_PREFIX_FEC;
 589       break;
 590     case MPLS_FEC_HOST:
 591       tlv->fecElArray[i].addressEl.type = MPLS_HOSTADR_FEC;
 592       tlv->fecElArray[i].addressEl.preLen = MPLS_IPv4LEN;
 593       tlv->fecElArray[i].addressEl.address = lf->u.host.u.ipv4;
 594       tlv->fecElemTypes[i] = MPLS_HOSTADR_FEC;
 595       break;
 596     default:
 597       MPLS_ASSERT(0);
 598   }
 599 }
 600
 601 void fec_tlv2mpls_fec(mplsLdpFecTlv_t * tlv, int i, mpls_fec * lf) {
 602   switch (tlv->fecElemTypes[i]) {
 603     case MPLS_PREFIX_FEC:
 604       lf->type = MPLS_FEC_PREFIX;
 605       lf->u.prefix.length = tlv->fecElArray[i].addressEl.preLen;
 606       lf->u.prefix.network.u.ipv4 = tlv->fecElArray[i].addressEl.address;
 607       lf->u.prefix.network.type = MPLS_FAMILY_IPV4;
 608       break;
 609     case MPLS_HOSTADR_FEC:
 610       lf->type = MPLS_FEC_HOST;
 611       lf->u.host.u.ipv4 = tlv->fecElArray[i].addressEl.address;
 612       lf->u.host.type = MPLS_FAMILY_IPV4;
 613       break;
 614     default:
 615       MPLS_ASSERT(0);
 616   }
 617 }
 618
 619 static uint32_t _ldp_fec_get_next_index()
 620 {
 621   uint32_t retval = _ldp_fec_next_index;
 622
 623   _ldp_fec_next_index++;
 624   if (retval > _ldp_fec_next_index) {
 625     _ldp_fec_next_index = 1;
 626   }
 627   return retval;
 628 }
 629
 630