summaryrefslogtreecommitdiff
path: root/ripngd/ripng_interface.c
blob: 369c3d6fb77875cedc5b65a4626097315879c506 (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
/*
 * Interface related function for RIPng.
 * Copyright (C) 1998 Kunihiro Ishiguro
 *
 * 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 "linklist.h"
#include "if.h"
#include "prefix.h"
#include "memory.h"
#include "network.h"
#include "filter.h"
#include "log.h"
#include "stream.h"
#include "zclient.h"
#include "command.h"
#include "table.h"
#include "thread.h"

#include "ripngd/ripngd.h"
#include "ripngd/ripng_debug.h"

/* If RFC2133 definition is used. */
#ifndef IPV6_JOIN_GROUP
#define IPV6_JOIN_GROUP  IPV6_ADD_MEMBERSHIP 
#endif
#ifndef IPV6_LEAVE_GROUP
#define IPV6_LEAVE_GROUP IPV6_DROP_MEMBERSHIP 
#endif

/* Static utility function. */
static void ripng_enable_apply (struct interface *);
static void ripng_passive_interface_apply (struct interface *);

/* Join to the all rip routers multicast group. */
int
ripng_multicast_join (struct interface *ifp)
{
  int ret;
  struct ipv6_mreq mreq;

  memset (&mreq, 0, sizeof (mreq));
  inet_pton(AF_INET6, RIPNG_GROUP, &mreq.ipv6mr_multiaddr);
  mreq.ipv6mr_interface = ifp->ifindex;

  ret = setsockopt (ripng->sock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
		    (char *) &mreq, sizeof (mreq));
  if (ret < 0)
    zlog_warn ("can't setsockopt IPV6_JOIN_GROUP: %s", strerror (errno));

  if (IS_RIPNG_DEBUG_EVENT)
    zlog_info ("RIPng %s join to all-rip-routers multicast group", ifp->name);

  return ret;
}

/* Leave from the all rip routers multicast group. */
int
ripng_multicast_leave (struct interface *ifp)
{
  int ret;
  struct ipv6_mreq mreq;

  memset (&mreq, 0, sizeof (mreq));
  inet_pton(AF_INET6, RIPNG_GROUP, &mreq.ipv6mr_multiaddr);
  mreq.ipv6mr_interface = ifp->ifindex;

  ret = setsockopt (ripng->sock, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
		    (char *) &mreq, sizeof (mreq));
  if (ret < 0)
    zlog_warn ("can't setsockopt IPV6_LEAVE_GROUP: %s\n", strerror (errno));

  if (IS_RIPNG_DEBUG_EVENT)
    zlog_info ("RIPng %s leave from all-rip-routers multicast group",
	       ifp->name);

  return ret;
}

/* Check max mtu size. */
int
ripng_check_max_mtu ()
{
  listnode node;
  struct interface *ifp;
  int mtu;

  mtu = 0;
  for (node = listhead (iflist); node; nextnode (node))
    {
      ifp = getdata (node);
      if (mtu < ifp->mtu)
	mtu = ifp->mtu;
    }
  return mtu;
}

int
ripng_if_down (struct interface *ifp)
{
  struct route_node *rp;
  struct ripng_info *rinfo;
  struct ripng_interface *ri;

  if (ripng->table)
    {
      for (rp = route_top (ripng->table); rp; rp = route_next (rp))
	if ((rinfo = rp->info) != NULL)
	  {
	    /* Routes got through this interface. */
	    if (rinfo->ifindex == ifp->ifindex
		&& rinfo->type == ZEBRA_ROUTE_RIPNG
		&& rinfo->sub_type == RIPNG_ROUTE_RTE)
	      {
		ripng_zebra_ipv6_delete ((struct prefix_ipv6 *) &rp->p,
					 &rinfo->nexthop,
					 rinfo->ifindex);

		RIPNG_TIMER_OFF (rinfo->t_timeout);
		RIPNG_TIMER_OFF (rinfo->t_garbage_collect);
	      
		rp->info = NULL;
		route_unlock_node (rp);
	      
		ripng_info_free (rinfo);
	      }
	    else
	      {
		/* All redistributed routes got through this interface. */
		if (rinfo->ifindex == ifp->ifindex)
		  ripng_redistribute_delete (rinfo->type, rinfo->sub_type,
					     (struct prefix_ipv6 *) &rp->p,
					     rinfo->ifindex);
	      }
	  }
    }

  ri = ifp->info;
  
  if (ripng && ri->running)
   {
     if (IS_RIPNG_DEBUG_EVENT)
       zlog_info ("turn off %s", ifp->name);

     /* Leave from multicast group. */
     ripng_multicast_leave (ifp);

     ri->running = 0;
   }

  return 0;
}

/* Inteface link up message processing. */
int
ripng_interface_up (int command, struct zclient *zclient, zebra_size_t length)
{
  struct stream *s;
  struct interface *ifp;

  /* zebra_interface_state_read() updates interface structure in iflist. */
  s = zclient->ibuf;
  ifp = zebra_interface_state_read (s);

  if (ifp == NULL)
    return 0;

  if (IS_RIPNG_DEBUG_ZEBRA)
    zlog_info ("interface up %s index %d flags %ld metric %d mtu %d",
	       ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu);

  /* Check if this interface is RIPng enabled or not. */
  ripng_enable_apply (ifp);

  /* Check for a passive interface. */
  ripng_passive_interface_apply (ifp);

  /* Apply distribute list to the all interface. */
  ripng_distribute_update_interface (ifp);

  return 0;
}

/* Inteface link down message processing. */
int
ripng_interface_down (int command, struct zclient *zclient,
		      zebra_size_t length)
{
  struct stream *s;
  struct interface *ifp;

  /* zebra_interface_state_read() updates interface structure in iflist. */
  s = zclient->ibuf;
  ifp = zebra_interface_state_read (s);

  if (ifp == NULL)
    return 0;

  ripng_if_down (ifp);

  if (IS_RIPNG_DEBUG_ZEBRA)
    zlog_info ("interface down %s index %d flags %ld metric %d mtu %d",
	       ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu);

  return 0;
}

/* Inteface addition message from zebra. */
int
ripng_interface_add (int command, struct zclient *zclient, zebra_size_t length)
{
  struct interface *ifp;

  ifp = zebra_interface_add_read (zclient->ibuf);

  if (IS_RIPNG_DEBUG_ZEBRA)
    zlog_info ("RIPng interface add %s index %d flags %ld metric %d mtu %d",
	       ifp->name, ifp->ifindex, ifp->flags, ifp->metric, ifp->mtu);

  /* Check is this interface is RIP enabled or not.*/
  ripng_enable_apply (ifp);

  /* Apply distribute list to the interface. */
  ripng_distribute_update_interface (ifp);

  /* Check interface routemap. */
  ripng_if_rmap_update_interface (ifp);

  return 0;
}

int
ripng_interface_delete (int command, struct zclient *zclient,
			zebra_size_t length)
{
  return 0;
}

int
ripng_interface_address_add (int command, struct zclient *zclient,
			     zebra_size_t length)
{
  struct connected *c;
  struct prefix *p;
  char buf[INET6_ADDRSTRLEN];

  c = zebra_interface_address_add_read (zclient->ibuf);

  if (c == NULL)
    return 0;

  p = c->address;

  if (p->family == AF_INET6)
    {
      if (IS_RIPNG_DEBUG_ZEBRA)
	zlog_info ("RIPng connected address %s/%d add",
		   inet_ntop (AF_INET6, &p->u.prefix6, buf, INET6_ADDRSTRLEN),
		   p->prefixlen);
      
      /* Check is this interface is RIP enabled or not.*/
      ripng_enable_apply (c->ifp);
    }

  return 0;
}

int
ripng_interface_address_delete (int command, struct zclient *zclient,
				zebra_size_t length)
{
  struct connected *ifc;
  struct prefix *p;
  char buf[INET6_ADDRSTRLEN];

  ifc = zebra_interface_address_delete_read (zclient->ibuf);
  
  if (ifc)
    {
      p = ifc->address;

      if (p->family == AF_INET6)
	{
	  if (IS_RIPNG_DEBUG_ZEBRA)
	    zlog_info ("RIPng connected address %s/%d delete",
		       inet_ntop (AF_INET6, &p->u.prefix6, buf,
				  INET6_ADDRSTRLEN),
		       p->prefixlen);

	  /* Check is this interface is RIP enabled or not.*/
	  ripng_enable_apply (ifc->ifp);
	}
      connected_free (ifc);
    }

  return 0;
}

/* RIPng enable interface vector. */
vector ripng_enable_if;

/* RIPng enable network table. */
struct route_table *ripng_enable_network;

/* Lookup RIPng enable network. */
int
ripng_enable_network_lookup (struct interface *ifp)
{
  listnode listnode;
  struct connected *connected;

  for (listnode = listhead (ifp->connected); listnode; nextnode (listnode))
    if ((connected = getdata (listnode)) != NULL)
      {
	struct prefix *p; 
	struct route_node *node;

	p = connected->address;

	if (p->family == AF_INET6)
	  {
	    node = route_node_match (ripng_enable_network, p);
	    if (node)
	      {
		route_unlock_node (node);
		return 1;
	      }
	  }
      }
  return -1;
}

/* Add RIPng enable network. */
int
ripng_enable_network_add (struct prefix *p)
{
  struct route_node *node;

  node = route_node_get (ripng_enable_network, p);

  if (node->info)
    {
      route_unlock_node (node);
      return -1;
    }
  else
    node->info = "enabled";

  return 1;
}

/* Delete RIPng enable network. */
int
ripng_enable_network_delete (struct prefix *p)
{
  struct route_node *node;

  node = route_node_lookup (ripng_enable_network, p);
  if (node)
    {
      node->info = NULL;

      /* Unlock info lock. */
      route_unlock_node (node);

      /* Unlock lookup lock. */
      route_unlock_node (node);

      return 1;
    }
  return -1;
}

/* Lookup function. */
int
ripng_enable_if_lookup (char *ifname)
{
  int i;
  char *str;

  for (i = 0; i < vector_max (ripng_enable_if); i++)
    if ((str = vector_slot (ripng_enable_if, i)) != NULL)
      if (strcmp (str, ifname) == 0)
	return i;
  return -1;
}

/* Add interface to ripng_enable_if. */
int
ripng_enable_if_add (char *ifname)
{
  int ret;

  ret = ripng_enable_if_lookup (ifname);
  if (ret >= 0)
    return -1;

  vector_set (ripng_enable_if, strdup (ifname));

  return 1;
}

/* Delete interface from ripng_enable_if. */
int
ripng_enable_if_delete (char *ifname)
{
  int index;
  char *str;

  index = ripng_enable_if_lookup (ifname);
  if (index < 0)
    return -1;

  str = vector_slot (ripng_enable_if, index);
  free (str);
  vector_unset (ripng_enable_if, index);

  return 1;
}

/* Wake up interface. */
int
ripng_interface_wakeup (struct thread *t)
{
  struct interface *ifp;
  struct ripng_interface *ri;

  /* Get interface. */
  ifp = THREAD_ARG (t);

  ri = ifp->info;
  ri->t_wakeup = NULL;

  /* Join to multicast group. */
  ripng_multicast_join (ifp);

  /* Send RIP request to the interface. */
  ripng_request (ifp);

  return 0;
}

/* Check RIPng is enabed on this interface. */
void
ripng_enable_apply (struct interface *ifp)
{
  int ret;
  struct ripng_interface *ri = NULL;

  /* Check interface. */
  if (if_is_loopback (ifp))
    return;

  if (! if_is_up (ifp))
    return;
  
  ri = ifp->info;

  /* Check network configuration. */
  ret = ripng_enable_network_lookup (ifp);

  /* If the interface is matched. */
  if (ret > 0)
    ri->enable_network = 1;
  else
    ri->enable_network = 0;

  /* Check interface name configuration. */
  ret = ripng_enable_if_lookup (ifp->name);
  if (ret >= 0)
    ri->enable_interface = 1;
  else
    ri->enable_interface = 0;

  /* Update running status of the interface. */
  if (ri->enable_network || ri->enable_interface)
    {
      if (! ri->running)
	{
	  if (IS_RIPNG_DEBUG_EVENT)
	    zlog_info ("RIPng turn on %s", ifp->name);

	  /* Add interface wake up thread. */
	  if (! ri->t_wakeup)
	    ri->t_wakeup = thread_add_timer (master, ripng_interface_wakeup,
					     ifp, 1);
#if 0
	  /* Join to multicast group. */
	  ripng_multicast_join (ifp);

	  /* Send RIP request to the interface. */
	  ripng_request (ifp);
#endif /* 0 */

	  ri->running = 1;
	}
    }
  else
    {
      if (ri->running)
	{
	  if (IS_RIPNG_DEBUG_EVENT)
	    zlog_info ("RIPng turn off %s", ifp->name);

	  /* Leave from multicast group. */
	  ripng_multicast_leave (ifp);

	  ri->running = 0;
	}
    }
}

/* Set distribute list to all interfaces. */
static void
ripng_enable_apply_all ()
{
  struct interface *ifp;
  listnode node;

  for (node = listhead (iflist); node; nextnode (node))
    {
      ifp = getdata (node);
      ripng_enable_apply (ifp);
    }
}

/* Vector to store passive-interface name. */
vector Vripng_passive_interface;

/* Utility function for looking up passive interface settings. */
int
ripng_passive_interface_lookup (char *ifname)
{
  int i;
  char *str;

  for (i = 0; i < vector_max (Vripng_passive_interface); i++)
    if ((str = vector_slot (Vripng_passive_interface, i)) != NULL)
      if (strcmp (str, ifname) == 0)
	return i;
  return -1;
}

void
ripng_passive_interface_apply (struct interface *ifp)
{
  int ret;
  struct ripng_interface *ri;

  ri = ifp->info;

  ret = ripng_passive_interface_lookup (ifp->name);
  if (ret < 0)
    ri->passive = 0;
  else
    ri->passive = 1;
}

void
ripng_passive_interface_apply_all (void)
{
  struct interface *ifp;
  listnode node;

  for (node = listhead (iflist); node; nextnode (node))
    {
      ifp = getdata (node);
      ripng_passive_interface_apply (ifp);
    }
}

/* Passive interface. */
int
ripng_passive_interface_set (struct vty *vty, char *ifname)
{
  if (ripng_passive_interface_lookup (ifname) >= 0)
    return CMD_WARNING;

  vector_set (Vripng_passive_interface, strdup (ifname));

  ripng_passive_interface_apply_all ();

  return CMD_SUCCESS;
}

int
ripng_passive_interface_unset (struct vty *vty, char *ifname)
{
  int i;
  char *str;

  i = ripng_passive_interface_lookup (ifname);
  if (i < 0)
    return CMD_WARNING;

  str = vector_slot (Vripng_passive_interface, i);
  free (str);
  vector_unset (Vripng_passive_interface, i);

  ripng_passive_interface_apply_all ();

  return CMD_SUCCESS;
}

/* Free all configured RIP passive-interface settings. */
void
ripng_passive_interface_clean (void)
{
  int i;
  char *str;

  for (i = 0; i < vector_max (Vripng_passive_interface); i++)
    if ((str = vector_slot (Vripng_passive_interface, i)) != NULL)
      {
	free (str);
	vector_slot (Vripng_passive_interface, i) = NULL;
      }
  ripng_passive_interface_apply_all ();
}

/* Write RIPng enable network and interface to the vty. */
int
ripng_network_write (struct vty *vty)
{
  int i;
  char *str;
  char *ifname;
  struct route_node *node;
  char buf[BUFSIZ];

  /* Write enable network. */
  for (node = route_top (ripng_enable_network); node; node = route_next (node))
    if (node->info)
      {
	struct prefix *p = &node->p;
	vty_out (vty, " network %s/%d%s", 
		 inet_ntop (p->family, &p->u.prefix, buf, BUFSIZ),
		 p->prefixlen,
		 VTY_NEWLINE);

      }
  
  /* Write enable interface. */
  for (i = 0; i < vector_max (ripng_enable_if); i++)
    if ((str = vector_slot (ripng_enable_if, i)) != NULL)
      vty_out (vty, " network %s%s", str,
	       VTY_NEWLINE);

  /* Write passive interface. */
  for (i = 0; i < vector_max (Vripng_passive_interface); i++)
    if ((ifname = vector_slot (Vripng_passive_interface, i)) != NULL)
      vty_out (vty, " passive-interface %s%s", ifname, VTY_NEWLINE);

  return 0;
}

/* RIPng enable on specified interface or matched network. */
DEFUN (ripng_network,
       ripng_network_cmd,
       "network IF_OR_ADDR",
       "RIPng enable on specified interface or network.\n"
       "Interface or address")
{
  int ret;
  struct prefix p;

  ret = str2prefix (argv[0], &p);

  /* Given string is IPv6 network or interface name. */
  if (ret)
    ret = ripng_enable_network_add (&p);
  else
    ret = ripng_enable_if_add (argv[0]);

  if (ret < 0)
    {
      vty_out (vty, "There is same network configuration %s%s", argv[0],
	       VTY_NEWLINE);
      return CMD_WARNING;
    }

  ripng_enable_apply_all ();

  return CMD_SUCCESS;
}

/* RIPng enable on specified interface or matched network. */
DEFUN (no_ripng_network,
       no_ripng_network_cmd,
       "no network IF_OR_ADDR",
       NO_STR
       "RIPng enable on specified interface or network.\n"
       "Interface or address")
{
  int ret;
  struct prefix p;

  ret = str2prefix (argv[0], &p);

  /* Given string is interface name. */
  if (ret)
    ret = ripng_enable_network_delete (&p);
  else
    ret = ripng_enable_if_delete (argv[0]);

  if (ret < 0)
    {
      vty_out (vty, "can't find network %s%s", argv[0],
	       VTY_NEWLINE);
      return CMD_WARNING;
    }
  
  ripng_enable_apply_all ();

  return CMD_SUCCESS;
}

DEFUN (ripng_passive_interface,
       ripng_passive_interface_cmd,
       "passive-interface IFNAME",
       "Suppress routing updates on an interface\n"
       "Interface name\n")
{
  return ripng_passive_interface_set (vty, argv[0]);
}

DEFUN (no_ripng_passive_interface,
       no_ripng_passive_interface_cmd,
       "no passive-interface IFNAME",
       NO_STR
       "Suppress routing updates on an interface\n"
       "Interface name\n")
{
  return ripng_passive_interface_unset (vty, argv[0]);
}

struct ripng_interface *
ri_new ()
{
  struct ripng_interface *ri;
  ri = XCALLOC (MTYPE_IF, sizeof (struct ripng_interface));
  return ri;
}

int
ripng_if_new_hook (struct interface *ifp)
{
  ifp->info = ri_new ();
  return 0;
}

/* Configuration write function for ripngd. */
int
interface_config_write (struct vty *vty)
{
  listnode node;
  struct interface *ifp;
  struct ripng_interface *ri;
  int write = 0;

  for (node = listhead (iflist); node; nextnode (node))
    {
      ifp = getdata (node);
      ri = ifp->info;

      vty_out (vty, "interface %s%s", ifp->name,
	       VTY_NEWLINE);
      if (ifp->desc)
	vty_out (vty, " description %s%s", ifp->desc,
		 VTY_NEWLINE);

      vty_out (vty, "!%s", VTY_NEWLINE);

      write++;
    }
  return write;
}

/* ripngd's interface node. */
struct cmd_node interface_node =
{
  INTERFACE_NODE,
  "%s(config-if)# ",
};

/* Initialization of interface. */
void
ripng_if_init ()
{
  /* Interface initialize. */
  iflist = list_new ();
  if_add_hook (IF_NEW_HOOK, ripng_if_new_hook);

  /* RIPng enable network init. */
  ripng_enable_network = route_table_init ();

  /* RIPng enable interface init. */
  ripng_enable_if = vector_init (1);

  /* RIPng passive interface. */
  Vripng_passive_interface = vector_init (1);

  /* Install interface node. */
  install_node (&interface_node, interface_config_write);

  install_element (CONFIG_NODE, &interface_cmd);
  install_element (CONFIG_NODE, &no_interface_cmd);
  install_element (INTERFACE_NODE, &config_end_cmd);
  install_element (INTERFACE_NODE, &config_exit_cmd);
  install_element (INTERFACE_NODE, &config_help_cmd);
  install_element (INTERFACE_NODE, &interface_desc_cmd);
  install_element (INTERFACE_NODE, &no_interface_desc_cmd);

  install_element (RIPNG_NODE, &ripng_network_cmd);
  install_element (RIPNG_NODE, &no_ripng_network_cmd);
  install_element (RIPNG_NODE, &ripng_passive_interface_cmd);
  install_element (RIPNG_NODE, &no_ripng_passive_interface_cmd);
}