summaryrefslogtreecommitdiffstats
path: root/proto/ospf/iface.c
blob: 83d591b48839ec6f8b9d6bf5e450db498d38f755 (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
/*
 *	BIRD -- OSPF
 *
 *	(c) 1999--2005 Ondrej Filip <feela@network.cz>
 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

#include "ospf.h"

char *ospf_is[] = { "down", "loop", "waiting", "point-to-point", "drother",
  "backup", "dr"
};

char *ospf_ism[] = { "interface up", "wait timer fired", "backup seen",
  "neighbor change", "loop indicated", "unloop indicated", "interface down"
};

char *ospf_it[] = { "broadcast", "nbma", "point-to-point", "virtual link" };

static void
poll_timer_hook(timer * timer)
{
  ospf_hello_send(timer, 1, NULL);
}

static void
hello_timer_hook(timer * timer)
{
  ospf_hello_send(timer, 0, NULL);
}

static void
wait_timer_hook(timer * timer)
{
  struct ospf_iface *ifa = (struct ospf_iface *) timer->data;
  struct proto *p = &ifa->oa->po->proto;

  OSPF_TRACE(D_EVENTS, "Wait timer fired on interface %s.", ifa->iface->name);
  ospf_iface_sm(ifa, ISM_WAITF);
}

u32
rxbufsize(struct ospf_iface *ifa)
{
  switch(ifa->rxbuf)
  {
    case OSPF_RXBUF_NORMAL:
      return (ifa->iface->mtu * 2);
      break;
    case OSPF_RXBUF_LARGE:
      return OSPF_MAX_PKT_SIZE;
      break;
    default:
      return ifa->rxbuf;
      break;
  }
}

static int
ospf_sk_open(struct ospf_iface *ifa)
{
  sock *sk;
  struct proto *p = &ifa->oa->po->proto;

  sk = sk_new(p->pool);
  sk->type = SK_IP;
  sk->dport = OSPF_PROTO;

#ifdef OSPFv2
  /*
   * In Linux IPv4, binding a raw socket to an IP address of an iface causes
   * that the socket does not receive multicast packets, as they have
   * different (multicast) destination IP address.
   */
  sk->saddr = IPA_NONE;
#else /* OSPFv3 */
  sk->saddr = ifa->addr->ip; /* link-local addr */
#endif

  sk->tos = IP_PREC_INTERNET_CONTROL;
  sk->rx_hook = ospf_rx_hook;
  sk->tx_hook = ospf_tx_hook;
  sk->err_hook = ospf_err_hook;
  sk->iface = ifa->iface;
  sk->rbsize = rxbufsize(ifa);
  sk->tbsize = ifa->iface->mtu;
  sk->data = (void *) ifa;
  sk->flags = SKF_LADDR_RX;

  if (sk_open(sk) != 0)
    goto err;

#ifdef OSPFv3
  /* 12 is an offset of the checksum in an OSPF packet */
  if (sk_set_ipv6_checksum(sk, 12) < 0)
    goto err;
#endif

  /*
   * For OSPFv2: When sending a packet, it is important to have a
   * proper source address. We expect that when we send one-hop
   * unicast packets, OS chooses a source address according to the
   * destination address (to be in the same prefix). We also expect
   * that when we send multicast packets, OS uses the source address
   * from sk->saddr registered to OS by sk_setup_multicast(). This
   * behavior is needed to implement multiple virtual ifaces (struct
   * ospf_iface) on one physical iface and is signalized by
   * CONFIG_MC_PROPER_SRC.
   *
   * If this behavior is not available (for example on BSD), we create
   * non-stub iface just for the primary IP address (see
   * ospf_iface_stubby()) and we expect OS to use primary IP address
   * as a source address for both unicast and multicast packets.
   *
   * FIXME: the primary IP address is currently just the
   * lexicographically smallest address on an interface, it should be
   * signalized by sysdep code which one is really the primary.
   */

  sk->saddr = ifa->addr->ip;
  if (sk_setup_multicast(sk) < 0)
    goto err;

  ifa->sk = sk;
  ifa->sk_spf = 0;
  ifa->sk_dr = 0;
  return 1;

 err:
  rfree(sk);
  return 0;
}

static inline void
ospf_sk_join_spf(struct ospf_iface *ifa)
{
  if (ifa->sk_spf)
    return;

  sk_join_group(ifa->sk, AllSPFRouters);
  ifa->sk_spf = 1;
}

static inline void
ospf_sk_join_dr(struct ospf_iface *ifa)
{
  if (ifa->sk_dr)
    return;

  sk_join_group(ifa->sk, AllDRouters);
  ifa->sk_dr = 1;
}

static inline void
ospf_sk_leave_spf(struct ospf_iface *ifa)
{
  if (!ifa->sk_spf)
    return;

  sk_leave_group(ifa->sk, AllSPFRouters);
  ifa->sk_spf = 0;
}

static inline void
ospf_sk_leave_dr(struct ospf_iface *ifa)
{
  if (!ifa->sk_dr)
    return;

  sk_leave_group(ifa->sk, AllDRouters);
  ifa->sk_dr = 0;
}

static inline void
ospf_sk_close(struct ospf_iface *ifa)
{
  ASSERT(ifa->sk);

  rfree(ifa->sk);
  ifa->sk = NULL;
}


/**
 * ospf_iface_chstate - handle changes of interface state
 * @ifa: OSPF interface
 * @state: new state
 *
 * Many actions must be taken according to interface state changes. New network
 * LSAs must be originated, flushed, new multicast sockets to listen for messages for
 * %ALLDROUTERS have to be opened, etc.
 */
void
ospf_iface_chstate(struct ospf_iface *ifa, u8 state)
{
  struct proto_ospf *po = ifa->oa->po;
  struct proto *p = &po->proto;
  u8 oldstate = ifa->state;

  if (oldstate != state)
  {
    ifa->state = state;

    if (ifa->type == OSPF_IT_VLINK)
    {
      OSPF_TRACE(D_EVENTS,
		 "Changing state of virtual link %R from \"%s\" into \"%s\".",
		 ifa->vid, ospf_is[oldstate], ospf_is[state]);
    }
    else
    {
      OSPF_TRACE(D_EVENTS,
		 "Changing state of iface: %s from \"%s\" into \"%s\".",
		 ifa->iface->name, ospf_is[oldstate], ospf_is[state]);
      if (ifa->iface->flags & IF_MULTICAST)
      {
	if ((ifa->type != OSPF_IT_NBMA) && (ifa->ioprob == OSPF_I_OK) &&
	    ((state == OSPF_IS_BACKUP) || (state == OSPF_IS_DR)))
	  ospf_sk_join_dr(ifa);
	else
	  ospf_sk_leave_dr(ifa);

	if ((oldstate == OSPF_IS_DR) && (ifa->net_lsa != NULL))
	{
	  ifa->net_lsa->lsa.age = LSA_MAXAGE;
	  if (state >= OSPF_IS_WAITING)
	  {
	    ospf_lsupd_flush_nlsa(po, ifa->net_lsa);
	  }
	  if (can_flush_lsa(po))
	    flush_lsa(ifa->net_lsa, po);
	  ifa->net_lsa = NULL;
	}
      }
      // FIXME flushling of link LSA
    }
  }
}

static void
ospf_iface_down(struct ospf_iface *ifa)
{
  struct ospf_neighbor *n, *nx;
  struct proto_ospf *po = ifa->oa->po;
  struct proto *p = &po->proto;
  struct ospf_iface *iff;

  OSPF_TRACE(D_EVENTS, "Removing interface %s", ifa->iface->name);

  /* First of all kill all the related vlinks */
  if (ifa->type != OSPF_IT_VLINK)
  {
    WALK_LIST(iff, po->iface_list)
    {
      if ((iff->type == OSPF_IT_VLINK) && (iff->vifa == ifa))
	ospf_iface_sm(iff, ISM_DOWN);
    }
  }

  WALK_LIST_DELSAFE(n, nx, ifa->neigh_list)
  {
    OSPF_TRACE(D_EVENTS, "Removing neighbor %I", n->ip);
    ospf_neigh_remove(n);
  }

  if (ifa->type == OSPF_IT_VLINK)
  {
    ifa->vifa = NULL;
    ifa->iface = NULL;
    ifa->addr = NULL;
    ifa->sk = NULL;
    ifa->vip = IPA_NONE;
    return;
  }
  else
  {
    ospf_sk_close(ifa);
    rfree(ifa->wait_timer);
    rfree(ifa->hello_timer);
    rfree(ifa->poll_timer);
    rfree(ifa->lock);
    rem_node(NODE ifa);
    mb_free(ifa);
  }
}

/**
 * ospf_iface_sm - OSPF interface state machine
 * @ifa: OSPF interface
 * @event: event comming to state machine
 *
 * This fully respects 9.3 of RFC 2328 except we don't use %LOOP state of
 * interface.
 */
void
ospf_iface_sm(struct ospf_iface *ifa, int event)
{
  struct ospf_area *oa = ifa->oa;

  DBG("SM on %s %s. Event is '%s'\n", (ifa->type == OSPF_IT_VLINK) ? "vlink" : "iface",
    ifa->iface ? ifa->iface->name : "(none)" , ospf_ism[event]);

  switch (event)
  {
  case ISM_UP:
    if (ifa->state == OSPF_IS_DOWN)
    {
      /* Now, nothing should be adjacent */
      if ((ifa->type == OSPF_IT_PTP) || (ifa->type == OSPF_IT_VLINK))
      {
	ospf_iface_chstate(ifa, OSPF_IS_PTP);
      }
      else
      {
	if (ifa->priority == 0)
	  ospf_iface_chstate(ifa, OSPF_IS_DROTHER);
	else
	{
	  ospf_iface_chstate(ifa, OSPF_IS_WAITING);
	  tm_start(ifa->wait_timer, ifa->waitint);
	}
      }

      tm_start(ifa->hello_timer, ifa->helloint);

      if (ifa->poll_timer)
	tm_start(ifa->poll_timer, ifa->pollint);

      hello_timer_hook(ifa->hello_timer);
    }
    schedule_link_lsa(ifa);
    schedule_rt_lsa(ifa->oa);
    break;
  case ISM_BACKS:
  case ISM_WAITF:
    if (ifa->state == OSPF_IS_WAITING)
    {
      bdr_election(ifa);
    }
    break;
  case ISM_NEICH:
    if ((ifa->state == OSPF_IS_DROTHER) || (ifa->state == OSPF_IS_DR) ||
	(ifa->state == OSPF_IS_BACKUP))
    {
      bdr_election(ifa);
      schedule_rt_lsa(ifa->oa);
    }
    break;
  case ISM_DOWN:
    ospf_iface_chstate(ifa, OSPF_IS_DOWN);
    ospf_iface_down(ifa);
    schedule_rt_lsa(oa);
    break;
    /*
  case ISM_LOOP:
    ospf_iface_chstate(ifa, OSPF_IS_LOOP);
    break;
  case ISM_UNLOOP:
    ospf_iface_chstate(ifa, OSPF_IS_DOWN);
    break;
    */
  default:
    bug("OSPF_I_SM - Unknown event?");
    break;
  }

}

u8
ospf_iface_clasify(struct iface *ifa, struct ifa *addr)
{
  if (addr->flags & IA_UNNUMBERED)
    return OSPF_IT_PTP;

  if ((ifa->flags & (IF_MULTIACCESS | IF_MULTICAST)) ==
      (IF_MULTIACCESS | IF_MULTICAST))
    return OSPF_IT_BCAST;

  if ((ifa->flags & (IF_MULTIACCESS | IF_MULTICAST)) == IF_MULTIACCESS)
    return OSPF_IT_NBMA;

  return OSPF_IT_PTP;
}

struct ospf_iface *
ospf_iface_find(struct proto_ospf *p, struct iface *what)
{
  struct ospf_iface *i;

  WALK_LIST(i, p->iface_list) if ((i->iface == what) && (i->type != OSPF_IT_VLINK))
    return i;
  return NULL;
}

static void
ospf_iface_add(struct object_lock *lock)
{
  struct ospf_iface *ifa = lock->data;
  struct proto_ospf *po = ifa->oa->po;
  struct proto *p = &po->proto;

  ifa->lock = lock;

  if (ospf_sk_open(ifa))
  {
    if (ifa->type != OSPF_IT_NBMA)
      ospf_sk_join_spf(ifa);
  }
  else
  {
    log(L_ERR "%s: Socket open failed on interface %s, declaring as stub", p->name, ifa->iface->name);
    ifa->ioprob = OSPF_I_SK;
    ifa->stub = 1;
  }

  ifa->state = OSPF_IS_DOWN;
  ospf_iface_sm(ifa, ISM_UP);
}

void
ospf_iface_new(struct proto_ospf *po, struct iface *iface, struct ifa *addr,
	       struct ospf_area_config *ac, struct ospf_iface_patt *ip)
{
  struct proto *p = &po->proto;
  struct ospf_iface *ifa;
  struct nbma_node *nbma, *nb;
  struct object_lock *lock;
  struct ospf_area *oa;

  if (ip->type != OSPF_IT_VLINK)
    OSPF_TRACE(D_EVENTS, "Adding interface %s", iface->name);

  ifa = mb_allocz(p->pool, sizeof(struct ospf_iface));
  ifa->iface = iface;
  ifa->addr = addr;

  ifa->cost = ip->cost;
  ifa->rxmtint = ip->rxmtint;
  ifa->inftransdelay = ip->inftransdelay;
  ifa->priority = ip->priority;
  ifa->helloint = ip->helloint;
  ifa->pollint = ip->pollint;
  ifa->strictnbma = ip->strictnbma;
  ifa->waitint = ip->waitint;
  ifa->dead = (ip->dead == 0) ? ip->deadc * ifa->helloint : ip->dead;
  ifa->stub = ospf_iface_stubby(ip, addr);
  ifa->ioprob = OSPF_I_OK;
  ifa->rxbuf = ip->rxbuf;

#ifdef OSPFv2
  ifa->autype = ip->autype;
  ifa->passwords = ip->passwords;
#endif

#ifdef OSPFv3
  ifa->instance_id = ip->instance_id;

  /*
  addr = NULL;
  if (ifa->type != OSPF_IT_VLINK)
    {
      struct ifa *a;
      WALK_LIST(a, iface->addrs)
	if (a->scope == SCOPE_LINK)
	  {
	    addr = a;
	    break;
	  }

      if (!addr)
      {
	log(L_ERR "%s: Missing link-local address on interface %s, declaring as stub", p->name,  iface->name);
	ifa->ioprob = OSPF_I_LL;
	ifa->stub = 1;
      }
    }
  */
#endif

  if (ip->type == OSPF_IT_UNDEF)
    ifa->type = ospf_iface_clasify(iface, addr);
  else
    ifa->type = ip->type;

#ifdef OSPFv2
  if ((ifa->type != OSPF_IT_PTP) && (ifa->type != OSPF_IT_VLINK) &&
      (addr->flags & IA_UNNUMBERED))
  {
    log(L_WARN "%s: Missing proper IP prefix on interface %s, forcing point-to-point mode",
	p->name,  iface->name);
    ifa->type = OSPF_IT_PTP;
  }
#endif

  init_list(&ifa->neigh_list);
  init_list(&ifa->nbma_list);

  WALK_LIST(nb, ip->nbma_list)
  {
    nbma = mb_alloc(p->pool, sizeof(struct nbma_node));
    nbma->ip = nb->ip;
    nbma->eligible = nb->eligible;
    add_tail(&ifa->nbma_list, NODE nbma);
  }

  /* Add hello timer */
  ifa->hello_timer = tm_new(p->pool);
  ifa->hello_timer->data = ifa;
  ifa->hello_timer->randomize = 0;
  ifa->hello_timer->hook = hello_timer_hook;
  ifa->hello_timer->recurrent = ifa->helloint;
  DBG("%s: Installing hello timer. (%u)\n", p->name, ifa->helloint);

  if (ifa->type == OSPF_IT_NBMA)
  {
    ifa->poll_timer = tm_new(p->pool);
    ifa->poll_timer->data = ifa;
    ifa->poll_timer->randomize = 0;
    ifa->poll_timer->hook = poll_timer_hook;
    ifa->poll_timer->recurrent = ifa->pollint;
    DBG("%s: Installing poll timer. (%u)\n", p->name, ifa->pollint);
  }
  else
    ifa->poll_timer = NULL;

  ifa->wait_timer = tm_new(p->pool);
  ifa->wait_timer->data = ifa;
  ifa->wait_timer->randomize = 0;
  ifa->wait_timer->hook = wait_timer_hook;
  ifa->wait_timer->recurrent = 0;
  DBG("%s: Installing wait timer. (%u)\n", p->name, ifa->waitint);
  add_tail(&((struct proto_ospf *) p)->iface_list, NODE ifa);
  ifa->state = OSPF_IS_DOWN;

  ifa->oa = NULL;
  WALK_LIST(oa, po->area_list)
  {
    if (oa->areaid == ac->areaid)
    {
      ifa->oa = oa;
      break;
    }
  }

  if (!ifa->oa)
    bug("Cannot add any area to accepted Interface");
  else

  if (ifa->type == OSPF_IT_VLINK)
  {
    ifa->oa = po->backbone;
    ifa->voa = oa;
    ifa->vid = ip->vid;
    return;			/* Don't lock, don't add sockets */
  }

  /*
   * In some cases we allow more ospf_ifaces on one physical iface.
   * In OSPFv2, if they use different IP address prefix.
   * In OSPFv3, if they use different instance_id.
   * Therefore, we store such info to lock->addr field.
   */

  lock = olock_new(p->pool);
#ifdef OSPFv2
  lock->addr = ifa->addr->prefix;
#else /* OSPFv3 */
  lock->addr = _MI(0,0,0,ifa->instance_id);
#endif
  lock->type = OBJLOCK_IP;
  lock->port = OSPF_PROTO;
  lock->iface = iface;
  lock->data = ifa;
  lock->hook = ospf_iface_add;

  olock_acquire(lock);
}


#ifdef OSPFv2

void
ospf_ifa_notify(struct proto *p, unsigned flags, struct ifa *a)
{
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct ospf_config *cf = (struct ospf_config *) (p->cf);

  if (a->flags & IA_SECONDARY)
    return;

  if (a->scope <= SCOPE_LINK)
    return;

  /* In OSPFv2, we create OSPF iface for each address. */
  if (flags & IF_CHANGE_UP)
  {
    int done = 0;
    struct ospf_area_config *ac;
    WALK_LIST(ac, cf->area_list)
    {
      struct ospf_iface_patt *ip = (struct ospf_iface_patt *)
	iface_patt_find(&ac->patt_list, a->iface, a);

      if (ip)
      {
	if (!done)
	  ospf_iface_new(po, a->iface, a, ac, ip);
	done++;
      }
    }

    if (done > 1)
      log(L_WARN "%s: Interface %s (IP %I) matches for multiple areas", p->name,  a->iface->name, a->ip);
  }

  if (flags & IF_CHANGE_DOWN)
  {
    struct ospf_iface *ifa, *ifx;
    WALK_LIST_DELSAFE(ifa, ifx, po->iface_list)
    {
      if ((ifa->type != OSPF_IT_VLINK) && (ifa->addr == a))
	ospf_iface_sm(ifa, ISM_DOWN);
      /* See a note in ospf_iface_notify() */
    }
  }
}

#else /* OSPFv3 */

static inline int iflag_test(u32 *a, u8 i)
{
  return a[i / 32] & (1u << (i % 32));
}

static inline void iflag_set(u32 *a, u8 i)
{
  a[i / 32] |= (1u << (i % 32));
}

void
ospf_ifa_notify(struct proto *p, unsigned flags, struct ifa *a)
{
  struct proto_ospf *po = (struct proto_ospf *) p;
  struct ospf_config *cf = (struct ospf_config *) (p->cf);

  if (a->flags & IA_SECONDARY)
    return;

  if (a->scope < SCOPE_LINK)
    return;

  /* In OSPFv3, we create OSPF iface for link-local address,
     other addresses are used for link-LSA. */
  if (a->scope == SCOPE_LINK)
  {
    if (flags & IF_CHANGE_UP)
    {
      u32 found_all[8] = {};
      struct ospf_area_config *ac;

      WALK_LIST(ac, cf->area_list)
      {
	u32 found_new[8] = {};
	struct iface_patt *p;

	WALK_LIST(p, ac->patt_list)
	{
	  if (iface_patt_match(p, i, a))
	  {
	    struct ospf_iface_patt *ip = (struct ospf_iface_patt *) p;

	    /* If true, we already assigned that IID and we skip
	       this to implement first-match behavior */
	    if (iflag_test(found_new, ip->instance_id))
	      continue;

	    /* If true, we already assigned that in a different area,
	       we log collision */
	    if (iflag_test(found_all, ip->instance_id))
	    {
	      log(L_WARN "%s: Interface %s (IID %d) matches for multiple areas",
		  p->name,  a->iface->name, ip->instance_id);
	      continue;
	    }

	    iflag_set(found_all, ip->instance_id);
	    iflag_set(found_new, ip->instance_id);
	    ospf_iface_new(po, a->iface, a, ac, ip);
	  }
	}
      }
    }

    if (flags & IF_CHANGE_DOWN)
    {
      struct ospf_iface *ifa, *ifx;
      WALK_LIST_DELSAFE(ifa, ifx, po->iface_list)
      {
	if ((ifa->type != OSPF_IT_VLINK) && (ifa->addr == a))
	  ospf_iface_sm(ifa, ISM_DOWN);
	/* See a note in ospf_iface_notify() */
      }
    }
  }
  else
  {
    struct ospf_iface *ifa;
    WALK_LIST(ifa, po->iface_list)
    {
      if (ifa->iface == a->iface)
      {
	schedule_rt_lsa(ifa->oa);
	/* Event 5 from RFC5340 4.4.3. */
	schedule_link_lsa(ifa);
	return;
      }
    }
  }
}

#endif

void
ospf_iface_change_mtu(struct proto_ospf *po, struct ospf_iface *ifa)
{
  struct proto *p = &po->proto;
  struct ospf_packet *op;
  struct ospf_neighbor *n;
  OSPF_TRACE(D_EVENTS, "Changing MTU on interface %s.", ifa->iface->name);

  if (ifa->sk)
  {
    ifa->sk->rbsize = rxbufsize(ifa);
    ifa->sk->tbsize = ifa->iface->mtu;
    sk_reallocate(ifa->sk);
  }

  WALK_LIST(n, ifa->neigh_list)
  {
    op = (struct ospf_packet *) n->ldbdes;
    n->ldbdes = mb_allocz(n->pool, ifa->iface->mtu);

    if (ntohs(op->length) <= ifa->iface->mtu)	/* If the packet in old buffer is bigger, let it filled by zeros */
      memcpy(n->ldbdes, op, ifa->iface->mtu);	/* If the packet is old is same or smaller, copy it */

    rfree(op);
  }
}

void
ospf_iface_notify(struct proto *p, unsigned flags, struct iface *iface)
{
  struct proto_ospf *po = (struct proto_ospf *) p;
    
  DBG("%s: If notify called\n", p->name);
  if (iface->flags & IF_IGNORE)
    return;

  if (flags & IF_CHANGE_DOWN)
  {
    struct ospf_iface *ifa, *ifx;
    WALK_LIST_DELSAFE(ifa, ifx, po->iface_list)
      if ((ifa->type != OSPF_IT_VLINK) && (ifa->iface == iface))
	ospf_iface_sm(ifa, ISM_DOWN);

    /* We use here that even shutting down iface also shuts down
       the vlinks, but vlinks are not freed and stays in the
       iface_list even when down */
  }

  if (flags & IF_CHANGE_MTU)
  {
    struct ospf_iface *ifa;
    WALK_LIST(ifa, po->iface_list)
      if ((ifa->type != OSPF_IT_VLINK) && (ifa->iface == iface))
	ospf_iface_change_mtu(po, ifa);
  }
}

void
ospf_iface_info(struct ospf_iface *ifa)
{
  char *strict = "(strict)";

  if ((ifa->type != OSPF_IT_NBMA) || (ifa->strictnbma == 0))
    strict = "";
  if (ifa->type == OSPF_IT_VLINK)
  {
    cli_msg(-1015, "Virtual link to %R:", ifa->vid);
    cli_msg(-1015, "\tPeer IP: %I", ifa->vip);
    cli_msg(-1015, "\tTransit area: %R (%u)", ifa->voa->areaid,
	    ifa->voa->areaid);
    cli_msg(-1015, "\tInterface: \"%s\"",
	    (ifa->iface ? ifa->iface->name : "(none)"));
  }
  else
  {
#ifdef OSPFv2
    if (ifa->addr->flags & IA_UNNUMBERED)
      cli_msg(-1015, "Interface %s (peer %I)", ifa->iface->name, ifa->addr->opposite);
    else
      cli_msg(-1015, "Interface %s (%I/%d)", ifa->iface->name, ifa->addr->prefix, ifa->addr->pxlen);
#else /* OSPFv3 */
    cli_msg(-1015, "Interface %s (IID %d)", ifa->iface->name, ifa->instance_id);
#endif
    cli_msg(-1015, "\tType: %s %s", ospf_it[ifa->type], strict);
    cli_msg(-1015, "\tArea: %R (%u)", ifa->oa->areaid, ifa->oa->areaid);
  }
  cli_msg(-1015, "\tState: %s %s", ospf_is[ifa->state],
	  ifa->stub ? "(stub)" : "");
  cli_msg(-1015, "\tPriority: %u", ifa->priority);
  cli_msg(-1015, "\tCost: %u", ifa->cost);
  cli_msg(-1015, "\tHello timer: %u", ifa->helloint);

  if (ifa->type == OSPF_IT_NBMA)
  {
    cli_msg(-1015, "\tPoll timer: %u", ifa->pollint);
  }
  cli_msg(-1015, "\tWait timer: %u", ifa->waitint);
  cli_msg(-1015, "\tDead timer: %u", ifa->dead);
  cli_msg(-1015, "\tRetransmit timer: %u", ifa->rxmtint);
  if ((ifa->type == OSPF_IT_BCAST) || (ifa->type == OSPF_IT_NBMA))
  {
    cli_msg(-1015, "\tDesigned router (ID): %R", ifa->drid);
    cli_msg(-1015, "\tDesigned router (IP): %I", ifa->drip);
    cli_msg(-1015, "\tBackup designed router (ID): %R", ifa->bdrid);
    cli_msg(-1015, "\tBackup designed router (IP): %I", ifa->bdrip);
  }
}

void
ospf_iface_shutdown(struct ospf_iface *ifa)
{
  init_list(&ifa->neigh_list);
  hello_timer_hook(ifa->hello_timer);
  ospf_sk_close(ifa);
}