summaryrefslogtreecommitdiffstats
path: root/proto/ospf/ospf.c
blob: ce01a37b4a7a4a66edd1d4558cc9718385738de5 (plain)
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
/*
 *	BIRD -- OSPF
 *
 *	(c) 1999--2004 Ondrej Filip <feela@network.cz>
 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

/**
 * DOC: Open Shortest Path First (OSPF)
 * 
 * The OSPF protocol is quite complicated and its complex implemenation is
 * split to many files. In |ospf.c|, you will find mainly the interface
 * for communication with the core (e.g., reconfiguration hooks, shutdown
 * and initialisation and so on). In |packet.c|, you will find various
 * functions for sending and receiving generic OSPF packets. There are
 * also routines for authentication and checksumming. File |iface.c| contains
 * the interface state machine and functions for allocation and deallocation of OSPF's
 * interface data structures. Source |neighbor.c| includes the neighbor state
 * machine and functions for election of Designated Router and Backup
 * Designated router. In |hello.c|, there are routines for sending
 * and receiving of hello packets as well as functions for maintaining
 * wait times and the inactivity timer. Files |lsreq.c|, |lsack.c|, |dbdes.c|
 * contain functions for sending and receiving of link-state requests,
 * link-state acknowledgements and database descriptions respectively.
 * In |lsupd.c|, there are functions for sending and receiving
 * of link-state updates and also the flooding algorithm. Source |topology.c| is
 * a place where routines for searching LSAs in the link-state database,
 * adding and deleting them reside, there also are functions for originating
 * of various types of LSAs (router LSA, net LSA, external LSA). File |rt.c|
 * contains routines for calculating the routing table. |lsalib.c| is a set
 * of various functions for working with the LSAs (endianity conversions,
 * calculation of checksum etc.).
 *
 * One instance of the protocol is able to hold LSA databases for
 * multiple OSPF areas, to exchange routing information between
 * multiple neighbors and to calculate the routing tables. The core
 * structure is &proto_ospf to which multiple &ospf_area and
 * &ospf_iface structures are connected. &ospf_area is also connected to
 * &top_hash_graph which is a dynamic hashing structure that
 * describes the link-state database. It allows fast search, addition
 * and deletion. Each LSA is kept in two pieces: header and body. Both of them are
 * kept in the endianity of the CPU.
 *
 * The heart beat of ospf is ospf_disp(). It is called at regular intervals
 * (&proto_ospf->tick). It is responsible for aging and flushing of LSAs in
 * the database, for routing table calculaction and it call area_disp() of every
 * ospf_area.
 * 
 * The function area_disp() is
 * responsible for late originating of router LSA and network LSA
 * and for cleanup after routing table calculation process in
 * the area.
 * To every &ospf_iface, we connect one or more
 * &ospf_neighbor's -- a structure containing many timers and queues
 * for building adjacency and for exchange of routing messages.
 *
 * BIRD's OSPF implementation respects RFC2328 in every detail, but
 * some of internal algorithms do differ. The RFC recommends making a snapshot
 * of the link-state database when a new adjacency is forming and sending
 * the database description packets based on the information in this 
 * snapshot. The database can be quite large in some networks, so
 * rather we walk through a &slist structure which allows us to
 * continue even if the actual LSA we were working with is deleted. New
 * LSAs are added at the tail of this &slist.
 *
 * We also don't keep a separate OSPF routing table, because the core
 * helps us by being able to recognize when a route is updated
 * to an identical one and it suppresses the update automatically.
 * Due to this, we can flush all the routes we've recalculated and
 * also those we've deleted to the core's routing table and the
 * core will take care of the rest. This simplifies the process
 * and conserves memory.
 */

#include "ospf.h"

static int ospf_rte_better(struct rte *new, struct rte *old);
static int ospf_rte_same(struct rte *new, struct rte *old);
static void ospf_disp(timer *timer);

static void
ospf_area_initfib(struct fib_node *fn)
{
  struct area_net *an = (struct area_net *) fn;
  an->hidden = 0;
  an->active = -1;	/* Force to regenerate summary lsa */
	/* ac->oldactive will be rewritten by ospf_rt_spf() */
}

static void
add_area_nets(struct ospf_area *oa, struct ospf_area_config *ac)
{
    struct proto_ospf *po = oa->po;
    struct proto *p = &po->proto;
    struct area_net_config *anet;
    struct area_net *antmp;

    fib_init(&oa->net_fib, p->pool, sizeof(struct area_net), 16, ospf_area_initfib);

    WALK_LIST(anet, ac->net_list)
    {
      antmp = (struct area_net *) fib_get(&oa->net_fib, &anet->px.addr, anet->px.len);
      antmp->hidden = anet->hidden;
    }
}

static int
ospf_start(struct proto *p)
{
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct ospf_config *c = (struct ospf_config *) (p->cf);
  struct ospf_area_config *ac;
  struct ospf_area *oa;

  po->rfc1583 = c->rfc1583;
  po->ebit = 0;

  po->tick = c->tick;
  po->disp_timer = tm_new(p->pool);
  po->disp_timer->data = po;
  po->disp_timer->randomize = 0;
  po->disp_timer->hook = ospf_disp;
  po->disp_timer->recurrent = po->tick;
  tm_start(po->disp_timer, 1);
  init_list(&(po->iface_list));
  init_list(&(po->area_list));
  fib_init(&po->rtf, p->pool, sizeof(ort), 16, ospf_rt_initort);
  po->areano = 0;
  po->gr = ospf_top_new(p->pool);
  po->cleanup = 1;
  s_init_list(&(po->lsal));
  if (EMPTY_LIST(c->area_list))
  {
    log(L_ERR "Cannot start, no OSPF areas configured!");
    return PS_DOWN;
  }

  WALK_LIST(ac, c->area_list)
  {
    oa = mb_allocz(p->pool, sizeof(struct ospf_area));
    add_tail(&po->area_list, NODE oa);
    po->areano++;
    oa->stub = ac->stub;
    oa->areaid = ac->areaid;
    oa->rt = NULL;
    oa->po = po;
    add_area_nets(oa, ac);
    fib_init(&oa->rtr, p->pool, sizeof(ort), 16, ospf_rt_initort);
    if (oa->areaid == 0) po->backbone = oa;
    oa->opt.byte = 0;
    if(!oa->stub) oa->opt.bit.e = 1;
  }

  /* Add all virtual links as interfaces */
  {
    struct ospf_iface_patt *ipatt;
    WALK_LIST(ac, c->area_list)
    {
      WALK_LIST(ipatt, ac->vlink_list)
      {
        if(!po->backbone)
	{
          oa = mb_allocz(p->pool, sizeof(struct ospf_area));
          add_tail(&po->area_list, NODE oa);
          po->areano++;
          oa->stub = 0;
          oa->areaid = 0;
          oa->rt = NULL;
          oa->po = po;
	  fib_init(&oa->net_fib, p->pool, sizeof(struct area_net), 16, ospf_area_initfib);
          fib_init(&oa->rtr, p->pool, sizeof(ort), 16, ospf_rt_initort);
          po->backbone = oa;
          oa->opt.byte = 0;
          oa->opt.bit.e = 1;
	}
        ospf_iface_new(po, NULL, ac, ipatt);
      }
    }
  }
  return PS_UP;
}

static void
ospf_dump(struct proto *p)
{
  struct ospf_iface *ifa;
  struct ospf_neighbor *n;
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct ospf_area *oa;

  OSPF_TRACE(D_EVENTS, "Area number: %d", po->areano);

  WALK_LIST(ifa, po->iface_list)
  {
    OSPF_TRACE(D_EVENTS, "Interface: %s", (ifa->iface ? ifa->iface->name : "(null)"));
    OSPF_TRACE(D_EVENTS, "state: %u", ifa->state);
    OSPF_TRACE(D_EVENTS, "DR:  %I", ifa->drid);
    OSPF_TRACE(D_EVENTS, "BDR: %I", ifa->bdrid);
    WALK_LIST(n, ifa->neigh_list)
    {
      OSPF_TRACE(D_EVENTS, "  neighbor %I in state %u", n->rid, n->state);
    }
  }

  OSPF_TRACE(D_EVENTS, "LSA graph dump start:");
  ospf_top_dump(po->gr, p);
  OSPF_TRACE(D_EVENTS, "LSA graph dump finished");
  neigh_dump_all();
}

static struct proto *
ospf_init(struct proto_config *c)
{
  struct proto *p = proto_new(c, sizeof(struct proto_ospf));

  p->import_control = ospf_import_control;
  p->make_tmp_attrs = ospf_make_tmp_attrs;
  p->store_tmp_attrs = ospf_store_tmp_attrs;
  p->rt_notify = ospf_rt_notify;
  p->if_notify = ospf_iface_notify;
  p->rte_better = ospf_rte_better;
  p->rte_same = ospf_rte_same;

  return p;
}

/* If new is better return 1 */
static int
ospf_rte_better(struct rte *new, struct rte *old)
{
  if (new->u.ospf.metric1 == LSINFINITY)
    return 0;

  if(new->attrs->source < old->attrs->source) return 1;
  if(new->attrs->source > old->attrs->source) return 0;

  if(new->attrs->source == RTS_OSPF_EXT2)
  {
    if(new->u.ospf.metric2 < old->u.ospf.metric2) return 1;
    if(new->u.ospf.metric2 > old->u.ospf.metric2) return 0;
  }

  if (new->u.ospf.metric1 < old->u.ospf.metric1)
    return 1;

  return 0;			/* Old is shorter or same */
}

static int
ospf_rte_same(struct rte *new, struct rte *old)
{
  /* new->attrs == old->attrs always */
  return
    new->u.ospf.metric1 == old->u.ospf.metric1 &&
    new->u.ospf.metric2 == old->u.ospf.metric2 &&
    new->u.ospf.tag == old->u.ospf.tag;
}

static ea_list *
ospf_build_attrs(ea_list * next, struct linpool *pool, u32 m1, u32 m2,
		 u32 tag)
{
  struct ea_list *l =
    lp_alloc(pool, sizeof(struct ea_list) + 3 * sizeof(eattr));

  l->next = next;
  l->flags = EALF_SORTED;
  l->count = 3;
  l->attrs[0].id = EA_OSPF_METRIC1;
  l->attrs[0].flags = 0;
  l->attrs[0].type = EAF_TYPE_INT | EAF_TEMP;
  l->attrs[0].u.data = m1;
  l->attrs[1].id = EA_OSPF_METRIC2;
  l->attrs[1].flags = 0;
  l->attrs[1].type = EAF_TYPE_INT | EAF_TEMP;
  l->attrs[1].u.data = m2;
  l->attrs[2].id = EA_OSPF_TAG;
  l->attrs[2].flags = 0;
  l->attrs[2].type = EAF_TYPE_INT | EAF_TEMP;
  l->attrs[2].u.data = tag;
  return l;
}

void
schedule_net_lsa(struct ospf_iface *ifa)
{
  ifa->orignet = 1;
}

void
schedule_rt_lsa(struct ospf_area *oa)
{
  struct proto *p = &oa->po->proto;

  OSPF_TRACE(D_EVENTS, "Scheduling RT lsa origination for area %I.",
	     oa->areaid);
  oa->origrt = 1;
}

void
schedule_rtcalc(struct proto_ospf *po)
{
  struct proto *p = &po->proto;

  if (po->calcrt)
    return;

  OSPF_TRACE(D_EVENTS, "Scheduling RT calculation.");
  po->calcrt = 1;
}

/**
 * area_disp - invokes origination of
 * router LSA and routing table cleanup
 * @oa: ospf area
 *
 * It invokes aging and when @ospf_area->origrt is set to 1, start
 * function for origination of router LSA and network LSAs.
 */
void
area_disp(struct ospf_area *oa)
{
  struct proto_ospf *po = oa->po;
  struct ospf_iface *ifa;

  /* Now try to originage rt_lsa */
  if (oa->origrt)
    originate_rt_lsa(oa);

  /* Now try to originate network LSA's */
  WALK_LIST(ifa, po->iface_list)
  {
    if (ifa->orignet && (ifa->oa == oa))
      originate_net_lsa(ifa);
  }
}

/**
 * ospf_disp - invokes routing table calctulation, aging and also area_disp()
 * @timer: timer usually called every @proto_ospf->tick second, @timer->data
 * point to @proto_ospf
 */
void
ospf_disp(timer * timer)
{
  struct proto_ospf *po = timer->data;
  struct ospf_area *oa;

  WALK_LIST(oa, po->area_list)
    area_disp(oa);

  /* Age LSA DB */
  ospf_age(po);

  /* Calculate routing table */
  if (po->calcrt)
    ospf_rt_spf (po);
}



/**
 * ospf_import_control - accept or reject new route from nest's routing table
 * @p: current instance of protocol
 * @new: the new route
 * @attrs: list of attributes
 * @pool: pool for allocation of attributes
 *
 * Its quite simple. It does not accept our own routes and leaves the decision on
 * import to the filters.
 */

int
ospf_import_control(struct proto *p, rte ** new, ea_list ** attrs,
		    struct linpool *pool)
{
  rte *e = *new;

  if (p == e->attrs->proto)
    return -1;			/* Reject our own routes */
  *attrs = ospf_build_attrs(*attrs, pool, LSINFINITY, 10000, 0);
  return 0;			/* Leave decision to the filters */
}

struct ea_list *
ospf_make_tmp_attrs(struct rte *rt, struct linpool *pool)
{
  return ospf_build_attrs(NULL, pool, rt->u.ospf.metric1, rt->u.ospf.metric2,
			  rt->u.ospf.tag);
}

void
ospf_store_tmp_attrs(struct rte *rt, struct ea_list *attrs)
{
  rt->u.ospf.metric1 = ea_get_int(attrs, EA_OSPF_METRIC1, LSINFINITY);
  rt->u.ospf.metric2 = ea_get_int(attrs, EA_OSPF_METRIC2, 10000);
  rt->u.ospf.tag = ea_get_int(attrs, EA_OSPF_TAG, 0);
}

/**
 * ospf_shutdown - Finish of OSPF instance
 * @p: current instance of protocol
 *
 * RFC does not define any action that should be taken before router
 * shutdown. To make my neighbors react as fast as possible, I send
 * them hello packet with empty neighbor list. They should start
 * their neighbor state machine with event %NEIGHBOR_1WAY.
 */

static int
ospf_shutdown(struct proto *p)
{
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct ospf_iface *ifa;
  OSPF_TRACE(D_EVENTS, "Shutdown requested");

  /* And send to all my neighbors 1WAY */
  WALK_LIST(ifa, po->iface_list) ospf_iface_shutdown(ifa);

  return PS_DOWN;
}

void
ospf_rt_notify(struct proto *p, net * n, rte * new, rte * old UNUSED,
	       ea_list * attrs)
{
  struct proto_ospf *po = (struct proto_ospf *) p;

/* Temporarily down write anything
  OSPF_TRACE(D_EVENTS, "Got route %I/%d %s", p->name, n->n.prefix,
    n->n.pxlen, new ? "up" : "down");
*/

  if (new)			/* Got some new route */
  {
    originate_ext_lsa(n, new, po, attrs);
  }
  else
  {
    u32 rtid = po->proto.cf->global->router_id;
    struct ospf_area *oa;
    struct top_hash_entry *en;
    u32 pr = ipa_to_u32(n->n.prefix);
    struct ospf_lsa_ext *ext;
    int i;
    int max = max_ext_lsa(n->n.pxlen);

    /* Flush old external LSA */
    for (i = 0; i < max; i++, pr++)
    {
      if (en = ospf_hash_find(po->gr, 0, pr, rtid, LSA_T_EXT))
      {
        ext = en->lsa_body;
	if (ipa_compare(ext->netmask, ipa_mkmask(n->n.pxlen)) == 0)
	{
          WALK_LIST(oa, po->area_list)
          {
	    ospf_lsupd_flush_nlsa(en, oa);
	  }
	}
        break;
      }
    }
  }
}

static void
ospf_get_status(struct proto *p, byte * buf)
{
  struct proto_ospf *po = (struct proto_ospf *) p;

  if (p->proto_state == PS_DOWN)
    buf[0] = 0;
  else
  {
    struct ospf_iface *ifa;
    struct ospf_neighbor *n;
    int adj = 0;

    WALK_LIST(ifa, po->iface_list)
      WALK_LIST(n, ifa->neigh_list) if (n->state == NEIGHBOR_FULL)
      adj = 1;

    if (adj == 0)
      strcpy(buf, "Alone");
    else
      strcpy(buf, "Running");
  }
}

static void
ospf_get_route_info(rte * rte, byte * buf, ea_list * attrs UNUSED)
{
  char *type = "<bug>";

  switch(rte->attrs->source)
  {
    case RTS_OSPF:
      type = "I";
      break;
    case RTS_OSPF_IA:
      type = "IA";
      break;
    case RTS_OSPF_EXT1:
      type = "E1";
      break;
    case RTS_OSPF_EXT2:
      type = "E2";
      break;
  }

  buf += bsprintf(buf, " %s", type);
  buf += bsprintf(buf, " (%d/%d", rte->pref, rte->u.ospf.metric1);
  if (rte->attrs->source == RTS_OSPF_EXT2)
    buf += bsprintf(buf, "/%d", rte->u.ospf.metric2);
  buf += bsprintf(buf, ")");
  if ((rte->attrs->source == RTS_OSPF_EXT2 || rte->attrs->source == RTS_OSPF_EXT1) && rte->u.ospf.tag)
  {
    buf += bsprintf(buf, " [%x]", rte->u.ospf.tag);
  }
}

static int
ospf_get_attr(eattr * a, byte * buf)
{
  switch (a->id)
  {
  case EA_OSPF_METRIC1:
    bsprintf(buf, "metric1");
    return GA_NAME;
  case EA_OSPF_METRIC2:
    bsprintf(buf, "metric2");
    return GA_NAME;
  case EA_OSPF_TAG:
    bsprintf(buf, "tag: %08x", a->u.data);
    return GA_FULL;
  default:
    return GA_UNKNOWN;
  }
}

static int
ospf_patt_compare(struct ospf_iface_patt *a, struct ospf_iface_patt *b)
{
  return ((a->type == b->type) && (a->priority == b->priority));
}

/**
 * ospf_reconfigure - reconfiguration hook
 * @p: current instance of protocol (with old configuration)
 * @c: new configuration requested by user
 *
 * This hook tries to be a little bit intelligent. Instance of OSPF
 * will survive change of many constants like hello interval,
 * password change, addition or deletion of some neighbor on
 * nonbroadcast network, cost of interface, etc.
 */
static int
ospf_reconfigure(struct proto *p, struct proto_config *c)
{
  struct ospf_config *old = (struct ospf_config *) (p->cf);
  struct ospf_config *new = (struct ospf_config *) c;
  struct ospf_area_config *ac1, *ac2;
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct ospf_iface_patt *ip1, *ip2;
  struct ospf_iface *ifa;
  struct nbma_node *nb1, *nb2, *nbnx;
  struct ospf_area *oa = NULL;
  struct area_net *anet, *antmp;
  int found;

  /* FIXME Temporarily disabled */

  return !memcmp(((byte *) old) + sizeof(struct proto_config),
     ((byte *) new) + sizeof(struct proto_config),
     sizeof(struct ospf_config) - sizeof(struct proto_config));


  po->rfc1583 = new->rfc1583;
  schedule_rtcalc(po);

  ac1 = HEAD(old->area_list);
  ac2 = HEAD(new->area_list);

  /* I should get it in same order */

  while (((NODE(ac1))->next != NULL) && ((NODE(ac2))->next != NULL))
  {
    if (ac1->areaid != ac2->areaid)
      return 0;
    if (ac1->stub != ac2->stub)
      return 0;			/* FIXME: non zero values can change */

    WALK_LIST(oa, po->area_list) if (oa->areaid == ac2->areaid)
      break;

    if (!oa)
      return 0;

    /* Change net_list */
    fib_free(&oa->net_fib);
    add_area_nets(oa, ac2);

    if (!iface_patts_equal(&ac1->patt_list, &ac2->patt_list,
			   (void *) ospf_patt_compare))
      return 0;

    WALK_LIST(ifa, po->iface_list)
    {
      if (ip1 = (struct ospf_iface_patt *)
	  iface_patt_match(&ac1->patt_list, ifa->iface))
      {
	/* Now reconfigure interface */
	if (!(ip2 = (struct ospf_iface_patt *)
	      iface_patt_match(&ac2->patt_list, ifa->iface)))
	  return 0;

	/* HELLO TIMER */
	if (ip1->helloint != ip2->helloint)
	{
	  ifa->helloint = ip2->helloint;
	  ifa->hello_timer->recurrent = ifa->helloint;
	  tm_start(ifa->hello_timer, ifa->helloint);
	  OSPF_TRACE(D_EVENTS,
		     "Changing hello interval on interface %s from %d to %d",
		     ifa->iface->name, ip1->helloint, ip2->helloint);
	}

	/* POLL TIMER */
	if (ip1->pollint != ip2->pollint)
	{
	  ifa->pollint = ip2->helloint;
	  ifa->poll_timer->recurrent = ifa->pollint;
	  tm_start(ifa->poll_timer, ifa->pollint);
	  OSPF_TRACE(D_EVENTS,
		     "Changing poll interval on interface %s from %d to %d",
		     ifa->iface->name, ip1->pollint, ip2->pollint);
	}

	/* COST */
	if (ip1->cost != ip2->cost)
	{
	  ifa->cost = ip2->cost;
	  OSPF_TRACE(D_EVENTS,
		     "Changing cost interface %s from %d to %d",
		     ifa->iface->name, ip1->cost, ip2->cost);
	  schedule_rt_lsa(ifa->oa);
	}

	/* strict nbma */
	if ((ip1->strictnbma == 0) && (ip2->strictnbma != 0))
	{
	  ifa->strictnbma = ip2->strictnbma;
	  OSPF_TRACE(D_EVENTS,
		     "Interface %s is now strict NBMA.", ifa->iface->name);
	}
	if ((ip1->strictnbma != 0) && (ip2->strictnbma == 0))
	{
	  ifa->strictnbma = ip2->strictnbma;
	  OSPF_TRACE(D_EVENTS,
		     "Interface %s is no longer strict NBMA.",
		     ifa->iface->name);
	}

	/* stub */
	if ((ip1->stub == 0) && (ip2->stub != 0))
	{
	  ifa->stub = ip2->stub;
	  OSPF_TRACE(D_EVENTS, "Interface %s is now stub.", ifa->iface->name);
	}
	if ((ip1->stub != 0) && (ip2->stub == 0) &&
	    ((ifa->ioprob & OSPF_I_IP) == 0) &&
	    (((ifa->ioprob & OSPF_I_MC) == 0) || (ifa->type == OSPF_IT_NBMA)))
	{
	  ifa->stub = ip2->stub;
	  OSPF_TRACE(D_EVENTS,
		     "Interface %s is no longer stub.", ifa->iface->name);
	}

	/* AUTHENTICATION */
	if (ip1->autype != ip2->autype)
	{
	  ifa->autype = ip2->autype;
	  OSPF_TRACE(D_EVENTS,
		     "Changing authentication type on interface %s",
		     ifa->iface->name);
	}
        /* FIXME Add *passwords */

	/* RXMT */
	if (ip1->rxmtint != ip2->rxmtint)
	{
	  ifa->rxmtint = ip2->rxmtint;
	  OSPF_TRACE(D_EVENTS,
		     "Changing retransmit interval on interface %s from %d to %d",
		     ifa->iface->name, ip1->rxmtint, ip2->rxmtint);
	}

	/* WAIT */
	if (ip1->waitint != ip2->waitint)
	{
	  ifa->waitint = ip2->waitint;
	  if (ifa->wait_timer->expires != 0)
	    tm_start(ifa->wait_timer, ifa->waitint);
	  OSPF_TRACE(D_EVENTS,
		     "Changing wait interval on interface %s from %d to %d",
		     ifa->iface->name, ip1->waitint, ip2->waitint);
	}

	/* INFTRANS */
	if (ip1->inftransdelay != ip2->inftransdelay)
	{
	  ifa->inftransdelay = ip2->inftransdelay;
	  OSPF_TRACE(D_EVENTS,
		     "Changing transmit delay on interface %s from %d to %d",
		     ifa->iface->name, ip1->inftransdelay,
		     ip2->inftransdelay);
	}

	/* DEAD COUNT */
	if (ip1->deadc != ip2->deadc)
	{
	  ifa->deadc = ip2->deadc;
	  OSPF_TRACE(D_EVENTS,
		     "Changing dead count on interface %s from %d to %d",
		     ifa->iface->name, ip1->deadc, ip2->deadc);
	}

	/* NBMA LIST */
	/* First remove old */
	WALK_LIST_DELSAFE(nb1, nbnx, ifa->nbma_list)
	{
	  found = 0;
	  WALK_LIST(nb2, ip2->nbma_list)
	    if (ipa_compare(nb1->ip, nb2->ip) == 0)
	  {
	    found = 1;
	    if (nb1->eligible != nb2->eligible)
	      OSPF_TRACE(D_EVENTS,
			 "Changing neighbor eligibility %I on interface %s",
			 nb1->ip, ifa->iface->name);
	    break;
	  }

	  if (!found)
	  {
	    OSPF_TRACE(D_EVENTS,
		       "Removing NBMA neighbor %I on interface %s",
		       nb1->ip, ifa->iface->name);
	    rem_node(NODE nb1);
	    mb_free(nb1);
	  }
	}
	/* And then add new */
	WALK_LIST(nb2, ip2->nbma_list)
	{
	  found = 0;
	  WALK_LIST(nb1, ifa->nbma_list)
	    if (ipa_compare(nb1->ip, nb2->ip) == 0)
	  {
	    found = 1;
	    break;
	  }
	  if (!found)
	  {
	    nb1 = mb_alloc(p->pool, sizeof(struct nbma_node));
	    nb1->ip = nb2->ip;
	    nb1->eligible = nb2->eligible;
	    add_tail(&ifa->nbma_list, NODE nb1);
	    OSPF_TRACE(D_EVENTS,
		       "Adding NBMA neighbor %I on interface %s",
		       nb1->ip, ifa->iface->name);
	  }
	}
      }
    }

    ac1 = (struct ospf_area_config *)(NODE(ac1))->next;
    ac2 = (struct ospf_area_config *)(NODE(ac2))->next;
  }

  if (((NODE(ac1))->next) != ((NODE(ac2))->next))
    return 0;			/* One is not null */

  return 1;			/* Everything OK :-) */
}

void
ospf_sh_neigh(struct proto *p, char *iff)
{
  struct ospf_iface *ifa = NULL, *f;
  struct ospf_neighbor *n;
  struct proto_ospf *po = (struct proto_ospf *) p;

  if (p->proto_state != PS_UP)
  {
    cli_msg(-1013, "%s: is not up", p->name);
    cli_msg(0, "");
    return;
  }

  if (iff != NULL)
  {
    WALK_LIST(f, po->iface_list)
    {
      if (strcmp(iff, f->iface->name) == 0)
      {
	ifa = f;
	break;
      }
    }
    if (ifa == NULL)
    {
      cli_msg(0, "");
      return;
    }
    cli_msg(-1013, "%s:", p->name);
    cli_msg(-1013, "%-12s\t%3s\t%-15s\t%-5s\t%-12s\t%-10s", "Router ID",
	    "Pri", "     State", "DTime", "Router IP", "Interface");
    WALK_LIST(n, ifa->neigh_list) ospf_sh_neigh_info(n);
    cli_msg(0, "");
    return;
  }

  cli_msg(-1013, "%s:", p->name);
  cli_msg(-1013, "%-12s\t%3s\t%-15s\t%-5s\t%-12s\t%-10s", "Router ID", "Pri",
	  "     State", "DTime", "Router IP", "Interface");
  WALK_LIST(ifa, po->iface_list)
    WALK_LIST(n, ifa->neigh_list) ospf_sh_neigh_info(n);
  cli_msg(0, "");
}

void
ospf_sh(struct proto *p)
{
  struct ospf_area *oa;
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct ospf_iface *ifa;
  struct ospf_neighbor *n;
  int ifano, nno, adjno, firstfib;
  struct area_net *anet;

  if (p->proto_state != PS_UP)
  {
    cli_msg(-1014, "%s: is not up", p->name);
    cli_msg(0, "");
    return;
  }

  cli_msg(-1014, "%s:", p->name);
  cli_msg(-1014, "RFC1583 compatibility: %s", (po->rfc1583 ? "enable" : "disabled"));
  cli_msg(-1014, "RT scheduler tick: %d", po->tick);
  cli_msg(-1014, "Number of areas: %u", po->areano);
  cli_msg(-1014, "Number of LSAs in DB:\t%u", po->gr->hash_entries);

  WALK_LIST(oa, po->area_list)
  {
    cli_msg(-1014, "\tArea: %I (%u) %s", oa->areaid, oa->areaid,
	    oa->areaid == 0 ? "[BACKBONE]" : "");
    ifano = 0;
    nno = 0;
    adjno = 0;
    WALK_LIST(ifa, po->iface_list)
    {
      if (oa == ifa->oa)
      {
	ifano++;
        WALK_LIST(n, ifa->neigh_list)
        {
	  nno++;
	  if (n->state == NEIGHBOR_FULL)
	    adjno++;
        }
      }
    }
    cli_msg(-1014, "\t\tStub:\t%s", oa->stub ? "Yes" : "No");
    cli_msg(-1014, "\t\tTransit:\t%s", oa->trcap ? "Yes" : "No");
    cli_msg(-1014, "\t\tNumber of interfaces:\t%u", ifano);
    cli_msg(-1014, "\t\tNumber of neighbors:\t%u", nno);
    cli_msg(-1014, "\t\tNumber of adjacent neighbors:\t%u", adjno);

    firstfib = 1;
    FIB_WALK(&oa->net_fib, nftmp)
    {
      anet = (struct area_net *) nftmp;
      if(firstfib)
      {
        cli_msg(-1014, "\t\tArea networks:");
        firstfib = 0;
      }
      cli_msg(-1014, "\t\t\t%1I/%u\t%s\t%s", anet->fn.prefix, anet->fn.pxlen,
		anet->hidden ? "Hidden" : "Advertise", anet->active ? "Active" : "");
    }
    FIB_WALK_END;
  }
  cli_msg(0, "");
}

void
ospf_sh_iface(struct proto *p, char *iff)
{
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct ospf_iface *ifa = NULL, *f;

  if (p->proto_state != PS_UP)
  {
    cli_msg(-1015, "%s: is not up", p->name);
    cli_msg(0, "");
    return;
  }

  if (iff != NULL)
  {
    WALK_LIST(f, po->iface_list)
    {
      if (strcmp(iff, f->iface->name) == 0)
      {
	ifa = f;
	break;
      }
    }

    if (ifa == NULL)
    {
      cli_msg(0, "");
      return;
    }
    cli_msg(-1015, "%s:", p->name);
    ospf_iface_info(ifa);
    cli_msg(0, "");
    return;
  }
  cli_msg(-1015, "%s:", p->name);
  WALK_LIST(ifa, po->iface_list) ospf_iface_info(ifa);
  cli_msg(0, "");
}

struct protocol proto_ospf = {
  name:"OSPF",
  template:"ospf%d",
  attr_class:EAP_OSPF,
  init:ospf_init,
  dump:ospf_dump,
  start:ospf_start,
  shutdown:ospf_shutdown,
  get_route_info:ospf_get_route_info,
  get_attr:ospf_get_attr,
  get_status:ospf_get_status,
  reconfigure:ospf_reconfigure
};