File: ospf_interface.c

package info (click to toggle)
quagga 0.98.3-7.5
  • links: PTS
  • area: main
  • in suites: sarge
  • size: 11,424 kB
  • ctags: 11,439
  • sloc: ansic: 164,201; sh: 9,243; perl: 638; makefile: 413; lisp: 62
file content (1215 lines) | stat: -rw-r--r-- 29,951 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
/*
 * OSPF Interface functions.
 * Copyright (C) 1999, 2000 Toshiaki Takada
 *
 * This file is part of GNU Zebra.
 * 
 * GNU Zebra is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Zebra; see the file COPYING.  If not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <zebra.h>

#include "thread.h"
#include "linklist.h"
#include "prefix.h"
#include "if.h"
#include "table.h"
#include "memory.h"
#include "command.h"
#include "stream.h"
#include "log.h"

#include "ospfd/ospfd.h"
#include "ospfd/ospf_spf.h"
#include "ospfd/ospf_interface.h"
#include "ospfd/ospf_ism.h"
#include "ospfd/ospf_asbr.h"
#include "ospfd/ospf_lsa.h"
#include "ospfd/ospf_lsdb.h"
#include "ospfd/ospf_neighbor.h"
#include "ospfd/ospf_nsm.h"
#include "ospfd/ospf_packet.h"
#include "ospfd/ospf_abr.h"
#include "ospfd/ospf_network.h"
#include "ospfd/ospf_dump.h"
#ifdef HAVE_SNMP
#include "ospfd/ospf_snmp.h"
#endif /* HAVE_SNMP */


int
ospf_if_get_output_cost (struct ospf_interface *oi)
{
  /* If all else fails, use default OSPF cost */
  u_int32_t cost;
  u_int32_t bw, refbw;

  bw = oi->ifp->bandwidth ? oi->ifp->bandwidth : OSPF_DEFAULT_BANDWIDTH;
  refbw = oi->ospf->ref_bandwidth;

  /* A specifed ip ospf cost overrides a calculated one. */
  if (OSPF_IF_PARAM_CONFIGURED (IF_DEF_PARAMS (oi->ifp), output_cost_cmd) ||
      OSPF_IF_PARAM_CONFIGURED (oi->params, output_cost_cmd))
    cost = OSPF_IF_PARAM (oi, output_cost_cmd);
  /* See if a cost can be calculated from the zebra processes
     interface bandwidth field. */
  else
    {
      cost = (u_int32_t) ((double)refbw / (double)bw + (double)0.5);
      if (cost < 1)
	cost = 1;
      else if (cost > 65535)
	cost = 65535;
    }

  return cost;
}

void
ospf_if_recalculate_output_cost (struct interface *ifp)
{
  u_int32_t newcost;
  struct route_node *rn;
  
  for (rn = route_top (IF_OIFS (ifp)); rn; rn = route_next (rn))
    {
      struct ospf_interface *oi;
      
      if ( (oi = rn->info) == NULL)
	continue;

      newcost = ospf_if_get_output_cost (oi);

      /* Is actual output cost changed? */
      if (oi->output_cost != newcost)
	{
	  oi->output_cost = newcost;
	  ospf_router_lsa_timer_add (oi->area);
	}
    }
}

/* Simulate down/up on the interface.  This is needed, for example, when 
   the MTU changes. */
void
ospf_if_reset(struct interface *ifp)
{
  struct route_node *rn;
  
  for (rn = route_top (IF_OIFS (ifp)); rn; rn = route_next (rn))
    {
      struct ospf_interface *oi;
      
      if ( (oi = rn->info) == NULL)
	continue;

      ospf_if_down(oi);
      ospf_if_up(oi);
    }
}

void
ospf_if_reset_variables (struct ospf_interface *oi)
{
  /* Set default values. */
  /* don't clear this flag.  oi->flag = OSPF_IF_DISABLE; */

  if (oi->vl_data)
    oi->type = OSPF_IFTYPE_VIRTUALLINK;
  else 
  /* preserve network-type */
  if (oi->type != OSPF_IFTYPE_NBMA)
    oi->type = OSPF_IFTYPE_BROADCAST;

  oi->state = ISM_Down;

  oi->crypt_seqnum = 0;

  /* This must be short, (less than RxmtInterval) 
     - RFC 2328 Section 13.5 para 3.  Set to 1 second to avoid Acks being
       held back for too long - MAG */
  oi->v_ls_ack = 1;  
}

/* lookup oi for specified prefix/ifp */
struct ospf_interface *
ospf_if_table_lookup (struct interface *ifp, struct prefix *prefix)
{
  struct prefix p;
  struct route_node *rn;
  struct ospf_interface *rninfo;
  
  p = *prefix;

  rn = route_node_get (IF_OIFS (ifp), &p);
  /* route_node_get implicitely locks */
  rninfo = (struct ospf_interface *) rn->info;
  route_unlock_node (rn);
  return rninfo;
}

void
ospf_add_to_if (struct interface *ifp, struct ospf_interface *oi)
{
  struct route_node *rn;
  struct prefix p;

  p = *oi->address;
  p.prefixlen = IPV4_MAX_PREFIXLEN;

  rn = route_node_get (IF_OIFS (ifp), &p);
  /* rn->info should either be NULL or equal to this oi
   * as route_node_get may return an existing node
   */
  assert (!rn->info || rn->info == oi);
  rn->info = oi;
}

void
ospf_delete_from_if (struct interface *ifp, struct ospf_interface *oi)
{
  struct route_node *rn;
  struct prefix p;

  p = *oi->address;
  p.prefixlen = IPV4_MAX_PREFIXLEN;

  rn = route_node_lookup (IF_OIFS (oi->ifp), &p);
  assert (rn);
  assert (rn->info);
  rn->info = NULL;
  route_unlock_node (rn);
  route_unlock_node (rn);
}

struct ospf_interface *
ospf_if_new (struct ospf *ospf, struct interface *ifp, struct prefix *p)
{
  struct ospf_interface *oi;

  if ((oi = ospf_if_table_lookup (ifp, p)) == NULL)
    {
      oi = XCALLOC (MTYPE_OSPF_IF, sizeof (struct ospf_interface));
      memset (oi, 0, sizeof (struct ospf_interface));
    }
  else
    return oi;
    
  /* Set zebra interface pointer. */
  oi->ifp = ifp;
  oi->address = p;
  
  ospf_add_to_if (ifp, oi);
  listnode_add (ospf->oiflist, oi);
  
  /* Clear self-originated network-LSA. */
  oi->network_lsa_self = NULL;

  /* Initialize neighbor list. */
  oi->nbrs = route_table_init ();

  /* Initialize static neighbor list. */
  oi->nbr_nbma = list_new ();

  /* Initialize Link State Acknowledgment list. */
  oi->ls_ack = list_new ();
  oi->ls_ack_direct.ls_ack = list_new ();

  /* Set default values. */
  ospf_if_reset_variables (oi);

  /* Add pseudo neighbor. */
  oi->nbr_self = ospf_nbr_new (oi);
  oi->nbr_self->state = NSM_TwoWay;
  oi->nbr_self->priority = OSPF_IF_PARAM (oi, priority);
  oi->nbr_self->options = OSPF_OPTION_E;

  oi->ls_upd_queue = route_table_init ();
  oi->t_ls_upd_event = NULL;
  oi->t_ls_ack_direct = NULL;

  oi->crypt_seqnum = time (NULL);

#ifdef HAVE_OPAQUE_LSA
  ospf_opaque_type9_lsa_init (oi);
#endif /* HAVE_OPAQUE_LSA */

  oi->ospf = ospf;
  
  return oi;
}

/* Restore an interface to its pre UP state
   Used from ism_interface_down only */
void
ospf_if_cleanup (struct ospf_interface *oi)
{
  struct route_node *rn;
  struct listnode *node;
  struct ospf_neighbor *nbr;

  /* oi->nbrs and oi->nbr_nbma should be deletete on InterafceDown event */
  /* delete all static neighbors attached to this interface */
  for (node = listhead (oi->nbr_nbma); node; )
    {
      struct ospf_nbr_nbma *nbr_nbma = getdata (node);
      nextnode (node);

      OSPF_POLL_TIMER_OFF (nbr_nbma->t_poll);

      if (nbr_nbma->nbr)
	{
	  nbr_nbma->nbr->nbr_nbma = NULL;
	  nbr_nbma->nbr = NULL;
	}

      nbr_nbma->oi = NULL;
      
      listnode_delete (oi->nbr_nbma, nbr_nbma);
    }

  /* send Neighbor event KillNbr to all associated neighbors. */
  for (rn = route_top (oi->nbrs); rn; rn = route_next (rn))
    if ((nbr = rn->info) != NULL)
      if (nbr != oi->nbr_self)
	OSPF_NSM_EVENT_EXECUTE (nbr, NSM_KillNbr);

  /* Cleanup Link State Acknowlegdment list. */
  for (node = listhead (oi->ls_ack); node; nextnode (node))
    ospf_lsa_unlock (node->data);
  list_delete_all_node (oi->ls_ack);

  oi->crypt_seqnum = 0;
  
  /* Empty link state update queue */
  ospf_ls_upd_queue_empty (oi);
  
 /* Handle pseudo neighbor. */
  ospf_nbr_delete (oi->nbr_self);
  oi->nbr_self = ospf_nbr_new (oi);
  oi->nbr_self->state = NSM_TwoWay;
  oi->nbr_self->priority = OSPF_IF_PARAM (oi, priority);

  switch (oi->area->external_routing)
    {
    case OSPF_AREA_DEFAULT:
      SET_FLAG (oi->nbr_self->options, OSPF_OPTION_E);
      break;
    case OSPF_AREA_STUB:
      UNSET_FLAG (oi->nbr_self->options, OSPF_OPTION_E);
      break;
    case OSPF_AREA_NSSA:
      UNSET_FLAG (oi->nbr_self->options, OSPF_OPTION_E);
      SET_FLAG (oi->nbr_self->options, OSPF_OPTION_NP);
      break;
    }

  ospf_lsa_unlock (oi->network_lsa_self);
  oi->network_lsa_self = NULL;
  OSPF_TIMER_OFF (oi->t_network_lsa_self);
}

void
ospf_if_free (struct ospf_interface *oi)
{
  ospf_if_down (oi);

  assert (oi->state == ISM_Down);

#ifdef HAVE_OPAQUE_LSA
  ospf_opaque_type9_lsa_term (oi);
#endif /* HAVE_OPAQUE_LSA */

  /* Free Pseudo Neighbour */
  ospf_nbr_delete (oi->nbr_self);
  
  route_table_finish (oi->nbrs);
  route_table_finish (oi->ls_upd_queue);
  
  /* Free any lists that should be freed */
  list_free (oi->nbr_nbma);
  
  list_free (oi->ls_ack);
  list_free (oi->ls_ack_direct.ls_ack);
  
  ospf_delete_from_if (oi->ifp, oi);

  listnode_delete (oi->ospf->oiflist, oi);
  listnode_delete (oi->area->oiflist, oi);

  memset (oi, 0, sizeof (*oi));
  XFREE (MTYPE_OSPF_IF, oi);
}


/*
*  check if interface with given address is configured and
*  return it if yes.  special treatment for PtP networks.
*/
struct ospf_interface *
ospf_if_is_configured (struct ospf *ospf, struct in_addr *address)
{
  struct listnode *node;
  struct ospf_interface *oi;
  struct prefix_ipv4 addr;

  addr.family = AF_INET;
  addr.prefix = *address;
  addr.prefixlen = IPV4_MAX_PREFIXLEN;
  
  for (node = listhead (ospf->oiflist); node; nextnode (node))
    if ((oi = getdata (node)) != NULL && oi->type != OSPF_IFTYPE_VIRTUALLINK)
      {
	if (oi->type == OSPF_IFTYPE_POINTOPOINT)
	  {
	    if (CONNECTED_DEST_HOST(oi->connected))
	      {
		/* match only destination addr, since local addr is most likely
		 * not unique (borrowed from another interface) */
		if (IPV4_ADDR_SAME (address,
				    &oi->connected->destination->u.prefix4))
		return oi;
	      }
	    else
	      {
		/* special leniency: match if addr is anywhere on PtP subnet */
		if (prefix_match(oi->address,(struct prefix *)&addr))
		  return oi;
	      }
	  }
	else
	  {
	    if (IPV4_ADDR_SAME (address, &oi->address->u.prefix4))
	      return oi;
	  }
      }
  return NULL;
}

int
ospf_if_is_up (struct ospf_interface *oi)
{
  return if_is_up (oi->ifp);
}

struct ospf_interface *
ospf_if_exists (struct ospf_interface *oic)
{ 
  struct listnode *node;
  struct ospf *ospf;
  struct ospf_interface *oi;

  ospf = ospf_lookup ();

  for (node = listhead (ospf->oiflist); node; nextnode (node))
  {
    if (((oi = getdata (node)) != NULL) && (oi == oic))
      return oi;
  }
  return NULL;
}

struct ospf_interface *
ospf_if_lookup_by_local_addr (struct ospf *ospf,
			      struct interface *ifp, struct in_addr address)
{
  struct listnode *node;
  struct ospf_interface *oi;
  
  for (node = listhead (ospf->oiflist); node; nextnode (node))
    if ((oi = getdata (node)) != NULL && oi->type != OSPF_IFTYPE_VIRTUALLINK)
      {
	if (ifp && oi->ifp != ifp)
	  continue;
	
	if (IPV4_ADDR_SAME (&address, &oi->address->u.prefix4))
	  return oi;
      }

  return NULL;
}

struct ospf_interface *
ospf_if_lookup_by_prefix (struct ospf *ospf, struct prefix_ipv4 *p)
{
  struct listnode *node;
  struct ospf_interface *oi;
  struct prefix ptmp;
  
  /* Check each Interface. */
  for (node = listhead (ospf->oiflist); node; nextnode (node))
    {
      if ((oi = getdata (node)) != NULL && oi->type != OSPF_IFTYPE_VIRTUALLINK)
	{
	  if ((oi->type == OSPF_IFTYPE_POINTOPOINT) &&
	      CONNECTED_DEST_HOST(oi->connected))
	    {
	      prefix_copy (&ptmp, oi->connected->destination);
	      ptmp.prefixlen = IPV4_MAX_BITLEN;
	    }
	  else
	    prefix_copy (&ptmp, oi->address);
	
	  apply_mask (&ptmp);
	  if (prefix_same (&ptmp, (struct prefix *) p))
	    return oi;
	}
    }
  return NULL;
}

/* determine receiving interface by source of packet */
struct ospf_interface *
ospf_if_lookup_recv_if (struct ospf *ospf, struct in_addr src)
{
  struct listnode *node;
  struct prefix_ipv4 addr;
  struct ospf_interface *oi, *match;

  addr.family = AF_INET;
  addr.prefix = src;
  addr.prefixlen = IPV4_MAX_BITLEN;

  match = NULL;

  for (node = listhead (ospf->oiflist); node; nextnode (node))
    {
      oi = getdata (node);
      
      if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
	continue;
      
      if ((oi->type == OSPF_IFTYPE_POINTOPOINT) &&
	  CONNECTED_DEST_HOST(oi->connected))
	{
	  if (IPV4_ADDR_SAME (&oi->connected->destination->u.prefix4, &src))
	    return oi;
	}
      else
	{
	  if (prefix_match (oi->address, (struct prefix *) &addr))
	    {
	      if ( (match == NULL) || 
	           (match->address->prefixlen < oi->address->prefixlen)
	         )
	        match = oi;
	    }
	}
    }

  return match;
}

void
ospf_if_stream_set (struct ospf_interface *oi)
{
  /* set output fifo queue. */
  if (oi->obuf == NULL) 
    oi->obuf = ospf_fifo_new ();
}

void
ospf_if_stream_unset (struct ospf_interface *oi)
{
  struct ospf *ospf = oi->ospf;

  if (oi->obuf)
    {
     ospf_fifo_free (oi->obuf);
     oi->obuf = NULL;

     if (oi->on_write_q)
       {
	 listnode_delete (ospf->oi_write_q, oi);
         if (list_isempty(ospf->oi_write_q))
           OSPF_TIMER_OFF (ospf->t_write);
	 oi->on_write_q = 0;
       }
    }
}


struct ospf_if_params *
ospf_new_if_params ()
{
  struct ospf_if_params *oip;

  oip = XMALLOC (MTYPE_OSPF_IF_PARAMS, sizeof (struct ospf_if_params));

  if (!oip)
    return NULL;

  memset (oip, 0, sizeof (struct ospf_if_params));

  UNSET_IF_PARAM (oip, output_cost_cmd);
  UNSET_IF_PARAM (oip, transmit_delay);
  UNSET_IF_PARAM (oip, retransmit_interval);
  UNSET_IF_PARAM (oip, passive_interface);
  UNSET_IF_PARAM (oip, v_hello);
  UNSET_IF_PARAM (oip, v_wait);
  UNSET_IF_PARAM (oip, priority);
  UNSET_IF_PARAM (oip, type);
  UNSET_IF_PARAM (oip, auth_simple);
  UNSET_IF_PARAM (oip, auth_crypt);
  UNSET_IF_PARAM (oip, auth_type);

  oip->auth_crypt = list_new ();
  
  return oip;
}

void
ospf_del_if_params (struct ospf_if_params *oip)
{
  list_delete (oip->auth_crypt);
  XFREE (MTYPE_OSPF_IF_PARAMS, oip);
}

void
ospf_free_if_params (struct interface *ifp, struct in_addr addr)
{
  struct ospf_if_params *oip;
  struct prefix_ipv4 p;
  struct route_node *rn;

  p.family = AF_INET;
  p.prefixlen = IPV4_MAX_PREFIXLEN;
  p.prefix = addr;
  rn = route_node_lookup (IF_OIFS_PARAMS (ifp), (struct prefix*)&p);
  if (!rn || !rn->info)
    return;

  oip = rn->info;
  route_unlock_node (rn);
  
  if (!OSPF_IF_PARAM_CONFIGURED (oip, output_cost_cmd) &&
      !OSPF_IF_PARAM_CONFIGURED (oip, transmit_delay) &&
      !OSPF_IF_PARAM_CONFIGURED (oip, retransmit_interval) &&
      !OSPF_IF_PARAM_CONFIGURED (oip, passive_interface) &&
      !OSPF_IF_PARAM_CONFIGURED (oip, v_hello) &&
      !OSPF_IF_PARAM_CONFIGURED (oip, v_wait) &&
      !OSPF_IF_PARAM_CONFIGURED (oip, priority) &&
      !OSPF_IF_PARAM_CONFIGURED (oip, type) &&
      !OSPF_IF_PARAM_CONFIGURED (oip, auth_simple) &&
      !OSPF_IF_PARAM_CONFIGURED (oip, auth_type) &&
      listcount (oip->auth_crypt) == 0)
    {
      ospf_del_if_params (oip);
      rn->info = NULL;
      route_unlock_node (rn);
    }
}

struct ospf_if_params *
ospf_lookup_if_params (struct interface *ifp, struct in_addr addr)
{
  struct prefix_ipv4 p;
  struct route_node *rn;

  p.family = AF_INET;
  p.prefixlen = IPV4_MAX_PREFIXLEN;
  p.prefix = addr;

  rn = route_node_lookup (IF_OIFS_PARAMS (ifp), (struct prefix*)&p);
  
  if (rn)
    {
      route_unlock_node (rn);
      return rn->info;
    }

  return NULL;
}

struct ospf_if_params *
ospf_get_if_params (struct interface *ifp, struct in_addr addr)
{
  struct prefix_ipv4 p;
  struct route_node *rn;

  p.family = AF_INET;
  p.prefixlen = IPV4_MAX_PREFIXLEN;
  p.prefix = addr;

  rn = route_node_get (IF_OIFS_PARAMS (ifp), (struct prefix*)&p);
  
  if (rn->info == NULL)
    rn->info = ospf_new_if_params ();
  else
    route_unlock_node (rn);
  
  return rn->info;
}

void
ospf_if_update_params (struct interface *ifp, struct in_addr addr)
{
  struct route_node *rn;
  struct ospf_interface *oi;
  
  for (rn = route_top (IF_OIFS (ifp)); rn; rn = route_next (rn))
    {
      if ((oi = rn->info) == NULL)
	continue;

      if (IPV4_ADDR_SAME (&oi->address->u.prefix4, &addr))
	oi->params = ospf_lookup_if_params (ifp, oi->address->u.prefix4);
    }
}

int
ospf_if_new_hook (struct interface *ifp)
{
  int rc = 0;

  ifp->info = XMALLOC (MTYPE_OSPF_IF_INFO, sizeof (struct ospf_if_info));
  memset (ifp->info, 0, sizeof (struct ospf_if_info));
  
  IF_OIFS (ifp) = route_table_init ();
  IF_OIFS_PARAMS (ifp) = route_table_init ();
  
  IF_DEF_PARAMS (ifp) = ospf_new_if_params ();
  
  SET_IF_PARAM (IF_DEF_PARAMS (ifp), transmit_delay);
  IF_DEF_PARAMS (ifp)->transmit_delay = OSPF_TRANSMIT_DELAY_DEFAULT;
  
  SET_IF_PARAM (IF_DEF_PARAMS (ifp), retransmit_interval);
  IF_DEF_PARAMS (ifp)->retransmit_interval = OSPF_RETRANSMIT_INTERVAL_DEFAULT;

  SET_IF_PARAM (IF_DEF_PARAMS (ifp), priority);
  IF_DEF_PARAMS (ifp)->priority = OSPF_ROUTER_PRIORITY_DEFAULT;

  SET_IF_PARAM (IF_DEF_PARAMS (ifp), passive_interface);
  IF_DEF_PARAMS (ifp)->passive_interface = OSPF_IF_ACTIVE;

  SET_IF_PARAM (IF_DEF_PARAMS (ifp), v_hello);
  IF_DEF_PARAMS (ifp)->v_hello = OSPF_HELLO_INTERVAL_DEFAULT;

  SET_IF_PARAM (IF_DEF_PARAMS (ifp), v_wait);
  IF_DEF_PARAMS (ifp)->v_wait = OSPF_ROUTER_DEAD_INTERVAL_DEFAULT;

  SET_IF_PARAM (IF_DEF_PARAMS (ifp), auth_simple);
  memset (IF_DEF_PARAMS (ifp)->auth_simple, 0, OSPF_AUTH_SIMPLE_SIZE);
  
  SET_IF_PARAM (IF_DEF_PARAMS (ifp), auth_type);
  IF_DEF_PARAMS (ifp)->auth_type = OSPF_AUTH_NOTSET;
  
#ifdef HAVE_OPAQUE_LSA
  rc = ospf_opaque_new_if (ifp);
#endif /* HAVE_OPAQUE_LSA */
  return rc;
}

int
ospf_if_delete_hook (struct interface *ifp)
{
  int rc = 0;
  struct route_node *rn;
#ifdef HAVE_OPAQUE_LSA
  rc = ospf_opaque_del_if (ifp);
#endif /* HAVE_OPAQUE_LSA */

  route_table_finish (IF_OIFS (ifp));

  for (rn = route_top (IF_OIFS_PARAMS (ifp)); rn; rn = route_next (rn))
    if (rn->info)
      ospf_del_if_params (rn->info);
  route_table_finish (IF_OIFS_PARAMS (ifp));

  ospf_del_if_params ((struct ospf_if_params *) IF_DEF_PARAMS (ifp));
  XFREE (MTYPE_OSPF_IF_INFO, ifp->info);
  ifp->info = NULL;

  return rc;
}

int
ospf_if_is_enable (struct ospf_interface *oi)
{
  if (!if_is_loopback (oi->ifp))
    if (if_is_up (oi->ifp))
	return 1;

  return 0;
}

int
ospf_if_up (struct ospf_interface *oi)
{
  if (oi == NULL)
    return 0;

  if (oi->type == OSPF_IFTYPE_LOOPBACK)
    OSPF_ISM_EVENT_SCHEDULE (oi, ISM_LoopInd);
  else
    {
      if (oi->type != OSPF_IFTYPE_VIRTUALLINK)
	ospf_if_add_allspfrouters (oi->ospf, oi->address, oi->ifp->ifindex);
      ospf_if_stream_set (oi);
      OSPF_ISM_EVENT_SCHEDULE (oi, ISM_InterfaceUp);
    }

  return 1;
}

int
ospf_if_down (struct ospf_interface *oi)
{
  if (oi == NULL)
    return 0;

  OSPF_ISM_EVENT_EXECUTE (oi, ISM_InterfaceDown);
  /* Shutdown packet reception and sending */
  ospf_if_stream_unset (oi);
  if (oi->type != OSPF_IFTYPE_VIRTUALLINK)
    ospf_if_drop_allspfrouters (oi->ospf, oi->address, oi->ifp->ifindex);


  return 1;
}


/* Virtual Link related functions. */

struct ospf_vl_data *
ospf_vl_data_new (struct ospf_area *area, struct in_addr vl_peer)
{
  struct ospf_vl_data *vl_data;

  vl_data = XMALLOC (MTYPE_OSPF_VL_DATA, sizeof (struct ospf_vl_data));
  memset (vl_data, 0, sizeof (struct ospf_vl_data));

  vl_data->vl_peer.s_addr = vl_peer.s_addr;
  vl_data->vl_area_id = area->area_id;
  vl_data->format = area->format;

  return vl_data;
}

void
ospf_vl_data_free (struct ospf_vl_data *vl_data)
{
  XFREE (MTYPE_OSPF_VL_DATA, vl_data);
}

u_int vlink_count = 0;

struct ospf_interface * 
ospf_vl_new (struct ospf *ospf, struct ospf_vl_data *vl_data)
{
  struct ospf_interface * voi;
  struct interface * vi;
  char   ifname[INTERFACE_NAMSIZ + 1];
  struct ospf_area *area;
  struct in_addr area_id;
  struct connected *co;
  struct prefix_ipv4 *p;
  
  if (IS_DEBUG_OSPF_EVENT)
    zlog_debug ("ospf_vl_new(): Start");
  if (vlink_count == OSPF_VL_MAX_COUNT)
    {
      if (IS_DEBUG_OSPF_EVENT)
	zlog_debug ("ospf_vl_new(): Alarm: "
		   "cannot create more than OSPF_MAX_VL_COUNT virtual links");
      return NULL;
    }

  if (IS_DEBUG_OSPF_EVENT)
    zlog_debug ("ospf_vl_new(): creating pseudo zebra interface");

  snprintf (ifname, INTERFACE_NAMSIZ + 1, "VLINK%d", vlink_count);
  vi = if_create (ifname, INTERFACE_NAMSIZ);
  co = connected_new ();
  co->ifp = vi;
  listnode_add (vi->connected, co);

  p = prefix_ipv4_new ();
  p->family = AF_INET;
  p->prefix.s_addr = 0;
  p->prefixlen = 0;
 
  co->address = (struct prefix *)p;
  
  voi = ospf_if_new (ospf, vi, co->address);
  if (voi == NULL)
    {
      if (IS_DEBUG_OSPF_EVENT)
	zlog_debug ("ospf_vl_new(): Alarm: OSPF int structure is not created");
      return NULL;
    }
  voi->connected = co;
  voi->vl_data = vl_data;
  voi->ifp->mtu = OSPF_VL_MTU;
  voi->type = OSPF_IFTYPE_VIRTUALLINK;

  vlink_count++;
  if (IS_DEBUG_OSPF_EVENT)
    zlog_debug ("ospf_vl_new(): Created name: %s", ifname);
  if (IS_DEBUG_OSPF_EVENT)
    zlog_debug ("ospf_vl_new(): set if->name to %s", vi->name);

  area_id.s_addr = 0;
  area = ospf_area_get (ospf, area_id, OSPF_AREA_ID_FORMAT_ADDRESS);
  voi->area = area;

  if (IS_DEBUG_OSPF_EVENT)
    zlog_debug ("ospf_vl_new(): set associated area to the backbone");

  ospf_area_add_if (voi->area, voi);

  ospf_if_stream_set (voi);

  if (IS_DEBUG_OSPF_EVENT)
    zlog_debug ("ospf_vl_new(): Stop");
  return voi;
}

void
ospf_vl_if_delete (struct ospf_vl_data *vl_data)
{
  struct interface *ifp = vl_data->vl_oi->ifp;
  vl_data->vl_oi->address->u.prefix4.s_addr = 0;
  vl_data->vl_oi->address->prefixlen = 0;
  ospf_if_free (vl_data->vl_oi);
  if_delete (ifp);
  vlink_count--;
}

struct ospf_vl_data *
ospf_vl_lookup (struct ospf_area *area, struct in_addr vl_peer)
{
  struct ospf_vl_data *vl_data;
  struct listnode *node;

  for (node = listhead (area->ospf->vlinks); node; nextnode (node))
    if ((vl_data = getdata (node)) != NULL)
      if (vl_data->vl_peer.s_addr == vl_peer.s_addr &&
          IPV4_ADDR_SAME (&vl_data->vl_area_id, &area->area_id))
        return vl_data;

  return NULL;
}

void 
ospf_vl_shutdown (struct ospf_vl_data *vl_data)
{
  struct ospf_interface *oi;

  if ((oi = vl_data->vl_oi) == NULL)
    return;

  oi->address->u.prefix4.s_addr = 0;
  oi->address->prefixlen = 0;

  UNSET_FLAG (oi->ifp->flags, IFF_UP);
  /* OSPF_ISM_EVENT_SCHEDULE (oi, ISM_InterfaceDown); */
  OSPF_ISM_EVENT_EXECUTE (oi, ISM_InterfaceDown);
}

void
ospf_vl_add (struct ospf *ospf, struct ospf_vl_data *vl_data)
{
  listnode_add (ospf->vlinks, vl_data);
#ifdef HAVE_SNMP
  ospf_snmp_vl_add (vl_data);
#endif /* HAVE_SNMP */
}

void
ospf_vl_delete (struct ospf *ospf, struct ospf_vl_data *vl_data)
{
  ospf_vl_shutdown (vl_data);
  ospf_vl_if_delete (vl_data);

#ifdef HAVE_SNMP
  ospf_snmp_vl_delete (vl_data);
#endif /* HAVE_SNMP */
  listnode_delete (ospf->vlinks, vl_data);

  ospf_vl_data_free (vl_data);
}

int
ospf_vl_set_params (struct ospf_vl_data *vl_data, struct vertex *v)
{
  int changed = 0;
  struct ospf_interface *voi;
  struct listnode *node;
  struct vertex_nexthop *nh;
  int i;
  struct router_lsa *rl;

  voi = vl_data->vl_oi;

  if (voi->output_cost != v->distance)
    {
     
      voi->output_cost = v->distance;
      changed = 1;
    }

  for (node = listhead (v->nexthop); node; nextnode (node))
    if ((nh = getdata (node)) != NULL)
      {
        vl_data->out_oi = (struct ospf_interface *) nh->oi;
        
        if (!IPV4_ADDR_SAME(&voi->address->u.prefix4,
                            &vl_data->out_oi->address->u.prefix4))
          changed = 1;
          
        voi->address->u.prefix4 = vl_data->out_oi->address->u.prefix4;
        voi->address->prefixlen = vl_data->out_oi->address->prefixlen;

        break; /* We take the first interface. */
      }

  rl = (struct router_lsa *)v->lsa;

  /* use SPF determined backlink index in struct vertex
   * for virtual link destination address
   */
  if (v->backlink >= 0)
    {
      if (!IPV4_ADDR_SAME (&vl_data->peer_addr,
                           &rl->link[v->backlink].link_data))
        changed = 1;
      vl_data->peer_addr = rl->link[v->backlink].link_data;
    }
  else
    {
      /* This is highly odd, there is no backlink index
       * there should be due to the ospf_spf_has_link() check
       * in SPF. Lets warn and try pick a link anyway.
       */
      zlog_warn ("ospf_vl_set_params: No backlink for %s!",
                 vl_data->vl_oi->ifp->name);
      for (i = 0; i < ntohs (rl->links); i++)
        {
          switch (rl->link[i].type)
            {
              case LSA_LINK_TYPE_VIRTUALLINK:
                if (IS_DEBUG_OSPF_EVENT)
                  zlog_debug ("found back link through VL");
              case LSA_LINK_TYPE_TRANSIT:
              case LSA_LINK_TYPE_POINTOPOINT:
                if (!IPV4_ADDR_SAME (&vl_data->peer_addr,
                                     &rl->link[i].link_data))
                  changed = 1;
                vl_data->peer_addr = rl->link[i].link_data;
              if (IS_DEBUG_OSPF_EVENT)
                zlog_debug ("ospf_vl_set_params: %s peer address is %s\n",
                               vl_data->vl_oi->ifp->name, 
                               inet_ntoa(vl_data->peer_addr));
              return changed;
            }
        }
    }
    
  if (IS_DEBUG_OSPF_EVENT)
    zlog_debug ("ospf_vl_set_params: %s peer address is %s\n",
               vl_data->vl_oi->ifp->name,
               inet_ntoa(vl_data->peer_addr));
               
  return changed;
}


void
ospf_vl_up_check (struct ospf_area *area, struct in_addr rid,
                  struct vertex *v)
{
  struct ospf *ospf = area->ospf;
  struct listnode *node;
  struct ospf_vl_data *vl_data;
  struct ospf_interface *oi;

  if (IS_DEBUG_OSPF_EVENT)
    {
      zlog_debug ("ospf_vl_up_check(): Start");
      zlog_debug ("ospf_vl_up_check(): Router ID is %s", inet_ntoa (rid));
      zlog_debug ("ospf_vl_up_check(): Area is %s", inet_ntoa (area->area_id));
    }

  for (node = listhead (ospf->vlinks); node; nextnode (node))
    {
      if ((vl_data = getdata (node)) == NULL)
        continue;
  
      if (IS_DEBUG_OSPF_EVENT)
	{
	  zlog_debug ("ospf_vl_up_check(): considering VL, name: %s", 
		     vl_data->vl_oi->ifp->name);
	  zlog_debug ("ospf_vl_up_check(): VL area: %s, peer ID: %s", 
		     inet_ntoa (vl_data->vl_area_id),
		     inet_ntoa (vl_data->vl_peer));
	}

      if (IPV4_ADDR_SAME (&vl_data->vl_peer, &rid) &&
          IPV4_ADDR_SAME (&vl_data->vl_area_id, &area->area_id))
        {
          oi = vl_data->vl_oi;
          SET_FLAG (vl_data->flags, OSPF_VL_FLAG_APPROVED);

	  if (IS_DEBUG_OSPF_EVENT)
	    zlog_debug ("ospf_vl_up_check(): this VL matched");

          if (oi->state == ISM_Down)
            {
	      if (IS_DEBUG_OSPF_EVENT)
		zlog_debug ("ospf_vl_up_check(): VL is down, waking it up");
              SET_FLAG (oi->ifp->flags, IFF_UP);
              OSPF_ISM_EVENT_EXECUTE(oi,ISM_InterfaceUp);
            }

         if (ospf_vl_set_params (vl_data, v))
           {
             if (IS_DEBUG_OSPF (ism, ISM_EVENTS))
               zlog_debug ("ospf_vl_up_check: VL cost change,"
                          " scheduling router lsa refresh");
             if(ospf->backbone)
               ospf_router_lsa_timer_add (ospf->backbone);
             else if (IS_DEBUG_OSPF (ism, ISM_EVENTS))
               zlog_debug ("ospf_vl_up_check: VL cost change, no backbone!");
           }
        }
    }
}

void
ospf_vl_unapprove (struct ospf *ospf)
{
  struct listnode *node;
  struct ospf_vl_data *vl_data;

  for (node = listhead (ospf->vlinks); node; nextnode (node))
    if ((vl_data = getdata (node)) != NULL)
      UNSET_FLAG (vl_data->flags, OSPF_VL_FLAG_APPROVED);
}

void
ospf_vl_shut_unapproved (struct ospf *ospf)
{
  struct listnode *node;
  struct ospf_vl_data *vl_data;

  for (node = listhead (ospf->vlinks); node; nextnode (node))
    if ((vl_data = getdata (node)) != NULL)
      if (!CHECK_FLAG (vl_data->flags, OSPF_VL_FLAG_APPROVED))
        ospf_vl_shutdown (vl_data);
}

int
ospf_full_virtual_nbrs (struct ospf_area *area)
{
  if (IS_DEBUG_OSPF_EVENT)
    {
      zlog_debug ("counting fully adjacent virtual neighbors in area %s",
		 inet_ntoa (area->area_id));
      zlog_debug ("there are %d of them", area->full_vls);
    }

  return area->full_vls;
}

int
ospf_vls_in_area (struct ospf_area *area)
{
  struct listnode *node;
  struct ospf_vl_data *vl_data;
  int c = 0;

  for (node = listhead (area->ospf->vlinks); node; nextnode (node))
    if ((vl_data = getdata (node)) != NULL)
      if (IPV4_ADDR_SAME (&vl_data->vl_area_id, &area->area_id))
        c++;

  return c;
}


struct crypt_key *
ospf_crypt_key_new ()
{
  struct crypt_key *ck;

  ck = XMALLOC (MTYPE_OSPF_CRYPT_KEY, sizeof (struct crypt_key));
  memset (ck, 0, sizeof (struct crypt_key));

  return ck;
}

void
ospf_crypt_key_add (struct list *crypt, struct crypt_key *ck)
{
  listnode_add (crypt, ck);
}

struct crypt_key *
ospf_crypt_key_lookup (struct list *auth_crypt, u_char key_id)
{
  struct listnode *node;
  struct crypt_key *ck;

  for (node = listhead (auth_crypt); node; nextnode (node))
    {
      ck = getdata (node);
      if (ck->key_id == key_id)
        return ck;
    }

  return NULL;
}

int
ospf_crypt_key_delete (struct list *auth_crypt, u_char key_id)
{
  struct listnode *node;
  struct crypt_key *ck;

  for (node = listhead (auth_crypt); node; nextnode (node))
    {
      ck = getdata (node);
      if (ck->key_id == key_id)
        {
          listnode_delete (auth_crypt, ck);
          return 1;
        }
    }

  return 0;
}

u_char
ospf_default_iftype(struct interface *ifp)
{
  if (if_is_pointopoint (ifp))
    return OSPF_IFTYPE_POINTOPOINT;
  else if (if_is_loopback (ifp))
    return OSPF_IFTYPE_LOOPBACK;
  else
    return OSPF_IFTYPE_BROADCAST;
}

void
ospf_if_init ()
{
  /* Initialize Zebra interface data structure. */
  if_init ();
  om->iflist = iflist;
  if_add_hook (IF_NEW_HOOK, ospf_if_new_hook);
  if_add_hook (IF_DELETE_HOOK, ospf_if_delete_hook);
}