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   while (nh) {
  48     if (!mpls_nexthop_compare(&nh->info, n)) {
  49       return nh;
  50     }
  51     nh = MPLS_LIST_NEXT(&f->nh_root, nh, _fec);
  52   }
  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       ldp_if_add_nexthop(iff, nh);
 239     }
 240   }
 241
 242   if (nh->type & MPLS_NH_OUTSEGMENT) {
 243     ldp_outlabel *out = NULL;
 244     MPLS_ASSERT((out = ldp_global_find_outlabel_handle(g,
 245       nh->info.outsegment_handle)));
 246
 247     ldp_outlabel_add_nexthop(out, nh);
 248   }
 249   return MPLS_SUCCESS;
 250
 251 ldp_fec_add_nexthop_error:
 252
 253   ldp_fec_del_nexthop(g, f, nh);
 254   return MPLS_FATAL;
 255 }
 256
 257 void ldp_fec_del_nexthop(ldp_global *g, ldp_fec * f, ldp_nexthop *nh)
 258 {
 259   MPLS_ASSERT(f && nh);
 260
 261   if (nh->addr) {
 262     ldp_addr_del_nexthop(g, nh->addr, nh);
 263   }
 264   if (nh->iff) {
 265     ldp_if_del_nexthop(g, nh->iff, nh);
 266   }
 267   if (nh->outlabel) {
 268     ldp_outlabel_del_nexthop(nh->outlabel, nh);
 269   }
 270
 271   MPLS_LIST_REMOVE(&f->nh_root, nh, _fec);
 272   ldp_nexthop_del_fec(nh);
 273
 274   MPLS_REFCNT_RELEASE(nh, ldp_nexthop_delete);
 275 }
 276
 277 mpls_return_enum ldp_fec_process_add(ldp_global * g, ldp_fec * f,
 278   ldp_nexthop *nh)
 279 {
 280   ldp_session *nh_session = NULL;
 281   ldp_session *peer = NULL;
 282   ldp_attr *ds_attr = NULL;
 283   ldp_attr *us_attr = NULL;
 284   mpls_bool egress = MPLS_BOOL_FALSE;
 285   ldp_outlabel *out;
 286
 287   LDP_ENTER(g->user_data, "ldp_fec_process_add");
 288
 289   /*
 290    * find the info about the next hop for this FEC
 291    */
 292   nh_session = ldp_session_for_nexthop(nh);
 293
 294   if (nh_session) {
 295     ds_attr = ldp_attr_find_downstream_state2(g, nh_session, f,
 296       LDP_LSP_STATE_MAP_RECV);
 297     if (ds_attr && !ds_attr->outlabel) {
 298       out = ldp_outlabel_create_complete(g, nh_session, ds_attr, nh);
 299       if (!out) {
 300         return MPLS_FAILURE;
 301       }
 302       ds_attr->outlabel = out;
 303     }
 304   }
 305
 306   /*
 307    * for every peer except the nh hop peer, check to see if we need to
 308    * send a mapping
 309    */
 310   peer = MPLS_LIST_HEAD(&g->session);
 311   while (peer != NULL) {        /* FEC.1 */
 312     if ((peer->state != LDP_STATE_OPERATIONAL) ||
 313       (nh_session && peer->index == nh_session->index)) {
 314       goto next_peer;
 315     }
 316     /* have I already sent a mapping for FEC to peer */
 317     if ((us_attr = ldp_attr_find_upstream_state2(g, peer, f,
 318       LDP_LSP_STATE_MAP_SENT))) {
 319       /* yep, don't send another */
 320       if (ds_attr) {
 321         if (ldp_inlabel_add_outlabel(g, us_attr->inlabel,
 322           ds_attr->outlabel) != MPLS_SUCCESS) {
 323           return MPLS_FAILURE;
 324         }
 325       }
 326       goto next_peer;
 327     }
 328
 329     if (peer->oper_distribution_mode == LDP_DISTRIBUTION_UNSOLICITED) {
 330       if (g->lsp_control_mode == LDP_CONTROL_INDEPENDENT) {
 331         us_attr =
 332           ldp_attr_find_upstream_state2(g, peer, f, LDP_LSP_STATE_REQ_RECV);
 333
 334         /* FEC.1.DUI3,4 */
 335         if (ldp_label_mapping_with_xc(g, peer, f, &us_attr, ds_attr) !=
 336           MPLS_SUCCESS) {
 337           if (!us_attr->in_tree) {
 338             ldp_attr_remove_complete(g, us_attr, MPLS_BOOL_FALSE);
 339           }
 340           goto next_peer;
 341         }
 342       } else {
 343         /*
 344          *LDP_CONTROL_ORDERED
 345          */
 346
 347         if (ds_attr || egress == MPLS_BOOL_TRUE) { /* FEC.1.DUO2 */
 348           if (!(us_attr = ldp_attr_create(&f->info))) {
 349             return MPLS_FAILURE;
 350           }
 351           /* FEC.1.DUO3-4 */
 352           if ((egress == MPLS_BOOL_TRUE) && (mpls_policy_egress_check(
 353             g->user_data, &f->info, &nh->info) == MPLS_BOOL_TRUE)) {
 354             goto next_peer;
 355           }
 356
 357           if (ldp_label_mapping_with_xc(g, peer, f, &us_attr, ds_attr) !=
 358             MPLS_SUCCESS) {
 359             return MPLS_FAILURE;
 360           }
 361         }
 362       }
 363     }
 364   next_peer:
 365     peer = MPLS_LIST_NEXT(&g->session, peer, _global);
 366   }
 367
 368   if (ds_attr) {                /* FEC.2 */
 369     if (ldp_label_mapping_process(g, nh_session, NULL, NULL, ds_attr, f) ==
 370       MPLS_FAILURE) { /* FEC.5 */
 371       return MPLS_FAILURE;
 372     }
 373     return MPLS_SUCCESS;
 374   }
 375
 376   /*
 377    * LDP_DISTRIBUTION_ONDEMAND
 378    */
 379   /* FEC.3 */
 380   if (nh_session &&
 381       nh_session->oper_distribution_mode == LDP_DISTRIBUTION_ONDEMAND) {
 382     /* assume we're always "request when needed" */
 383     ds_attr = NULL;
 384     if (ldp_label_request_for_xc(g, nh_session, &f->info, NULL, &ds_attr) ==
 385       MPLS_FAILURE) { /* FEC.4 */
 386       return MPLS_FAILURE;
 387     }
 388   }
 389
 390   LDP_EXIT(g->user_data, "ldp_fec_process_add");
 391
 392   return MPLS_SUCCESS;           /* FEC.6 */
 393 }
 394
 395 mpls_return_enum ldp_fec_process_change(ldp_global * g, ldp_fec * f,
 396   ldp_nexthop *nh, ldp_session *nh_session_old) {
 397   ldp_session *peer = NULL;
 398   ldp_attr *us_attr = NULL;
 399   ldp_attr *ds_attr = NULL;
 400   ldp_session *nh_session_new = NULL;
 401
 402   LDP_ENTER(g->user_data, "ldp_fec_process_change");
 403
 404   /*
 405    * NH 1-5 decide if we need to release an existing mapping
 406    */
 407   ds_attr = ldp_attr_find_downstream_state2(g, nh_session_old, f,
 408       LDP_LSP_STATE_MAP_RECV);
 409   if (!ds_attr) {               /* NH.1 */
 410     goto Detect_Change_Fec_Next_Hop_6;
 411   }
 412
 413   if (ds_attr->ingress == MPLS_BOOL_TRUE) {
 414
 415 #if MPLS_USE_LSR
 416     lsr_ftn ftn;
 417     ftn.outsegment_index = ds_attr->outlabel->info.handle;
 418     memcpy(&ftn.fec, &f->info, sizeof(mpls_fec));
 419     lsr_cfg_ftn_set2(g->lsr_handle, &ftn, LSR_CFG_DEL);
 420 #else
 421     mpls_mpls_fec2out_del(g->mpls_handle, &f->info, &ds_attr->outlabel->info);
 422 #endif
 423     ds_attr->ingress = MPLS_BOOL_FALSE;
 424     ds_attr->outlabel->merge_count--;
 425   }
 426
 427   if (g->label_retention_mode == LDP_RETENTION_LIBERAL) { /* NH.3 */
 428     ldp_attr *us_temp;
 429     us_attr = MPLS_LIST_HEAD(&ds_attr->us_attr_root);
 430     while (us_attr) {
 431       /* need to walk the list in such a way as not to
 432        * "pull the rug out from under me self"
 433        */
 434       us_temp = MPLS_LIST_NEXT(&ds_attr->us_attr_root, us_attr, _ds_attr);
 435       if (us_attr->state == LDP_LSP_STATE_MAP_SENT) {
 436         ldp_inlabel_del_outlabel(g, us_attr->inlabel);  /* NH.2 */
 437         ldp_attr_del_us2ds(us_attr, ds_attr);
 438       }
 439       us_attr = us_temp;
 440     }
 441     goto Detect_Change_Fec_Next_Hop_6;
 442   }
 443
 444   ldp_label_release_send(g, nh_session_old, ds_attr, LDP_NOTIF_NONE); /* NH.4 */
 445   ldp_attr_remove_complete(g, ds_attr, MPLS_BOOL_FALSE); /* NH.2,5 */
 446
 447 Detect_Change_Fec_Next_Hop_6:
 448
 449   /*
 450    * NH 6-9 decides is we need to send a label request abort
 451    */
 452   ds_attr = ldp_attr_find_downstream_state2(g, nh_session_old, f,
 453     LDP_LSP_STATE_REQ_SENT);
 454   if (ds_attr) {               /* NH.6 */
 455     if (g->label_retention_mode != LDP_RETENTION_CONSERVATIVE) { /* NH.7 */
 456       /* NH.8,9 */
 457       if (ldp_label_abort_send(g, nh_session_old, ds_attr) != MPLS_SUCCESS) {
 458         return MPLS_FAILURE;
 459       }
 460     }
 461   }
 462
 463   /*
 464    * NH 10-12 decides if we can use a mapping from our database
 465    */
 466   if (!(nh_session_new = ldp_get_next_hop_session_for_fec2(f,nh))) {
 467     goto Detect_Change_Fec_Next_Hop_16;
 468   }
 469
 470   ds_attr = ldp_attr_find_downstream_state2(g, nh_session_new, f,
 471     LDP_LSP_STATE_MAP_RECV);
 472   if (!ds_attr) {               /* NH.11 */
 473     goto Detect_Change_Fec_Next_Hop_13;
 474   }
 475
 476   if (ldp_label_mapping_process(g, nh_session_new, NULL, NULL, ds_attr, f) !=
 477     MPLS_SUCCESS) { /* NH.12 */
 478     return MPLS_FAILURE;
 479   }
 480   goto Detect_Change_Fec_Next_Hop_20;
 481
 482 Detect_Change_Fec_Next_Hop_13:
 483
 484   /*
 485    * NH 13-15 decides if we need to make a label request
 486    */
 487   if (nh_session_new->oper_distribution_mode == LDP_DISTRIBUTION_ONDEMAND &&
 488     g->label_retention_mode == LDP_RETENTION_CONSERVATIVE) {
 489     /* NH.14-15 */
 490     if (ldp_label_request_for_xc(g, nh_session_new, &f->info, NULL, &ds_attr) !=
 491         MPLS_SUCCESS) {
 492       return MPLS_FAILURE;
 493     }
 494   }
 495   goto Detect_Change_Fec_Next_Hop_20;
 496
 497 Detect_Change_Fec_Next_Hop_16:
 498
 499   peer = MPLS_LIST_HEAD(&g->session);
 500   while (peer) {
 501     if (peer->state == LDP_STATE_OPERATIONAL) {
 502       us_attr = ldp_attr_find_upstream_state2(g, peer, f,
 503         LDP_LSP_STATE_MAP_SENT);
 504       if (us_attr) {    /* NH.17 */
 505         if (ldp_label_withdraw_send(g, peer, us_attr, LDP_NOTIF_NONE) !=
 506           MPLS_SUCCESS) { /* NH.18 */
 507           ldp_attr_remove_complete(g, us_attr, MPLS_BOOL_FALSE);
 508           return MPLS_FAILURE;
 509         }
 510       }
 511     }
 512     peer = MPLS_LIST_NEXT(&g->session, peer, _global);
 513   }
 514
 515 Detect_Change_Fec_Next_Hop_20:
 516
 517   LDP_EXIT(g->user_data, "ldp_fec_process_change");
 518
 519   return MPLS_SUCCESS;
 520 }
 521
 522 ldp_fec *ldp_fec_create()
 523 {
 524   ldp_fec *fec = (ldp_fec *) mpls_malloc(sizeof(ldp_fec));
 525
 526   if (fec != NULL) {
 527     memset(fec, 0, sizeof(ldp_fec));
 528     MPLS_REFCNT_INIT(fec, 0);
 529     MPLS_LIST_ELEM_INIT(fec, _global);
 530     MPLS_LIST_ELEM_INIT(fec, _inlabel);
 531     MPLS_LIST_ELEM_INIT(fec, _outlabel);
 532     MPLS_LIST_ELEM_INIT(fec, _fec);
 533     MPLS_LIST_INIT(&fec->nh_root, ldp_nexthop);
 534     MPLS_LIST_INIT(&fec->fs_root_us, ldp_fs);
 535     MPLS_LIST_INIT(&fec->fs_root_ds, ldp_fs);
 536     fec->info.type = MPLS_FEC_NONE;
 537     fec->index = _ldp_fec_get_next_index();
 538   }
 539   return fec;
 540 }
 541
 542 void mpls_fec2ldp_fec(mpls_fec * a, ldp_fec * b)
 543 {
 544   memcpy(&b->info, a, sizeof(mpls_fec));
 545 }
 546
 547 ldp_fec *ldp_fec_create_host(mpls_inet_addr * host)
 548 {
 549   ldp_fec *fec = ldp_fec_create();
 550
 551   if (fec != NULL) {
 552     fec->info.type = MPLS_FEC_HOST;
 553     memcpy(&fec->info.u.host, host, sizeof(mpls_inet_addr));
 554   }
 555   return fec;
 556 }
 557
 558 ldp_fec *ldp_fec_create_prefix(mpls_inet_addr * prefix, int prefix_len)
 559 {
 560   ldp_fec *fec = ldp_fec_create();
 561
 562   if (fec != NULL) {
 563     fec->info.type = MPLS_FEC_PREFIX;
 564     memcpy(&fec->info.u.prefix.network, prefix, sizeof(mpls_inet_addr));
 565     fec->info.u.prefix.length = prefix_len;
 566   }
 567   return fec;
 568 }
 569
 570 void ldp_fec_delete(ldp_fec * fec)
 571 {
 572   mpls_free(fec);
 573 }
 574
 575 void mpls_fec2fec_tlv(mpls_fec * lf, mplsLdpFecTlv_t * tlv, int i)
 576 {
 577   tlv->fecElArray[i].addressEl.addressFam = 1;
 578
 579   switch (lf->type) {
 580     case MPLS_FEC_PREFIX:
 581       tlv->fecElArray[i].addressEl.type = MPLS_PREFIX_FEC;
 582       tlv->fecElArray[i].addressEl.preLen = lf->u.prefix.length;
 583       tlv->fecElArray[i].addressEl.address = lf->u.prefix.network.u.ipv4;
 584       tlv->fecElemTypes[i] = MPLS_PREFIX_FEC;
 585       break;
 586     case MPLS_FEC_HOST:
 587       tlv->fecElArray[i].addressEl.type = MPLS_HOSTADR_FEC;
 588       tlv->fecElArray[i].addressEl.preLen = MPLS_IPv4LEN;
 589       tlv->fecElArray[i].addressEl.address = lf->u.host.u.ipv4;
 590       tlv->fecElemTypes[i] = MPLS_HOSTADR_FEC;
 591       break;
 592     default:
 593       MPLS_ASSERT(0);
 594   }
 595 }
 596
 597 void fec_tlv2mpls_fec(mplsLdpFecTlv_t * tlv, int i, mpls_fec * lf) {
 598   switch (tlv->fecElemTypes[i]) {
 599     case MPLS_PREFIX_FEC:
 600       lf->type = MPLS_FEC_PREFIX;
 601       lf->u.prefix.length = tlv->fecElArray[i].addressEl.preLen;
 602       lf->u.prefix.network.u.ipv4 = tlv->fecElArray[i].addressEl.address;
 603       lf->u.prefix.network.type = MPLS_FAMILY_IPV4;
 604       break;
 605     case MPLS_HOSTADR_FEC:
 606       lf->type = MPLS_FEC_HOST;
 607       lf->u.host.u.ipv4 = tlv->fecElArray[i].addressEl.address;
 608       lf->u.host.type = MPLS_FAMILY_IPV4;
 609       break;
 610     default:
 611       MPLS_ASSERT(0);
 612   }
 613 }
 614
 615 static uint32_t _ldp_fec_get_next_index()
 616 {
 617   uint32_t retval = _ldp_fec_next_index;
 618
 619   _ldp_fec_next_index++;
 620   if (retval > _ldp_fec_next_index) {
 621     _ldp_fec_next_index = 1;
 622   }
 623   return retval;
 624 }
 625
 626