aboutsummaryrefslogtreecommitdiffstats
path: root/src/plugins/lisp/lisp-gpe/interface.c
blob: 1d2abaf3f90e8a1eb086e83a56bcfe0dc33208b2 (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
/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @file
 * @brief Common utility functions for LISP-GPE interfaces.
 *
 */

#include <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/udp/udp_inlines.h>
#include <vnet/ethernet/ethernet.h>
#include <lisp/lisp-gpe/lisp_gpe.h>
#include <lisp/lisp-gpe/lisp_gpe_fwd_entry.h>
#include <lisp/lisp-gpe/lisp_gpe_tenant.h>
#include <lisp/lisp-gpe/lisp_gpe_adjacency.h>
#include <vnet/adj/adj.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/fib/ip6_fib.h>
#include <lisp/lisp-cp/lisp_cp_dpo.h>

/**
 * @brief The VLIB node arc/edge from the interface's TX node, to the L2
 * load-balanceing node. Which is where all packets go
 */
static uword l2_arc_to_lb;

#define foreach_lisp_gpe_tx_next        \
  _(DROP, "error-drop")                 \
  _(IP4_LOOKUP, "ip4-lookup")           \
  _(IP6_LOOKUP, "ip6-lookup")

typedef enum
{
#define _(sym,str) LISP_GPE_TX_NEXT_##sym,
  foreach_lisp_gpe_tx_next
#undef _
    LISP_GPE_TX_N_NEXT,
} lisp_gpe_tx_next_t;

typedef struct
{
  u32 tunnel_index;
} lisp_gpe_tx_trace_t;

u8 *
format_lisp_gpe_tx_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  lisp_gpe_tx_trace_t *t = va_arg (*args, lisp_gpe_tx_trace_t *);

  s = format (s, "LISP-GPE-TX: tunnel %d", t->tunnel_index);
  return s;
}

#define is_v4_packet(_h) ((*(u8*) _h) & 0xF0) == 0x40

/**
 * @brief LISP-GPE interface TX (encap) function.
 * @node lisp_gpe_interface_tx
 *
 * The LISP-GPE interface TX (encap) function.
 *
 * Looks up the associated tunnel based on the adjacency hit in the SD FIB
 * and if the tunnel is multihomed it uses the flow hash to determine
 * sub-tunnel, and rewrite string, to be used to encapsulate the packet.
 *
 * @param[in]   vm      vlib_main_t corresponding to the current thread.
 * @param[in]   node    vlib_node_runtime_t data for this node.
 * @param[in]   frame   vlib_frame_t whose contents should be dispatched.
 *
 * @return number of vectors in frame.
 */
static uword
lisp_gpe_interface_tx (vlib_main_t * vm, vlib_node_runtime_t * node,
		       vlib_frame_t * from_frame)
{
  u32 n_left_from, next_index, *from, *to_next;
  lisp_gpe_main_t *lgm = &lisp_gpe_main;

  from = vlib_frame_vector_args (from_frame);
  n_left_from = from_frame->n_vectors;

  next_index = node->cached_next_index;

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  u32 bi0, adj_index0, next0;
	  const ip_adjacency_t *adj0;
	  const dpo_id_t *dpo0;
	  vlib_buffer_t *b0;
	  u8 is_v4_0;

	  bi0 = from[0];
	  to_next[0] = bi0;
	  from += 1;
	  to_next += 1;
	  n_left_from -= 1;
	  n_left_to_next -= 1;

	  b0 = vlib_get_buffer (vm, bi0);

	  /* Fixup the checksum and len fields in the LISP tunnel encap
	   * that was applied at the midchain node */
	  is_v4_0 = is_v4_packet (vlib_buffer_get_current (b0));
	  ip_udp_fixup_one (lgm->vlib_main, b0, is_v4_0);

	  /* Follow the DPO on which the midchain is stacked */
	  adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
	  adj0 = adj_get (adj_index0);
	  dpo0 = &adj0->sub_type.midchain.next_dpo;
	  next0 = dpo0->dpoi_next_node;
	  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;

	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      lisp_gpe_tx_trace_t *tr = vlib_add_trace (vm, node, b0,
							sizeof (*tr));
	      tr->tunnel_index = adj_index0;
	    }
	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
					   n_left_to_next, bi0, next0);
	}

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  return from_frame->n_vectors;
}

static u8 *
format_lisp_gpe_name (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  return format (s, "lisp_gpe%d", dev_instance);
}

/* *INDENT-OFF* */
VNET_DEVICE_CLASS (lisp_gpe_device_class) = {
  .name = "LISP_GPE",
  .format_device_name = format_lisp_gpe_name,
  .format_tx_trace = format_lisp_gpe_tx_trace,
  .tx_function = lisp_gpe_interface_tx,
};
/* *INDENT-ON* */

u8 *
format_lisp_gpe_header_with_length (u8 * s, va_list * args)
{
  lisp_gpe_header_t *h = va_arg (*args, lisp_gpe_header_t *);
  u32 max_header_bytes = va_arg (*args, u32);
  u32 header_bytes;

  header_bytes = sizeof (h[0]);
  if (max_header_bytes != 0 && header_bytes > max_header_bytes)
    return format (s, "lisp-gpe header truncated");

  s = format (s, "flags: ");
#define _(n,v) if (h->flags & v) s = format (s, "%s ", #n);
  foreach_lisp_gpe_flag_bit;
#undef _

  s = format (s, "\n  ver_res %d res %d next_protocol %d iid %d(%x)",
	      h->ver_res, h->res, h->next_protocol,
	      clib_net_to_host_u32 (h->iid << 8),
	      clib_net_to_host_u32 (h->iid << 8));
  return s;
}

/* *INDENT-OFF* */
VNET_HW_INTERFACE_CLASS (lisp_gpe_hw_class) = {
  .name = "LISP_GPE",
  .format_header = format_lisp_gpe_header_with_length,
  .build_rewrite = lisp_gpe_build_rewrite,
  .update_adjacency = lisp_gpe_update_adjacency,
};
/* *INDENT-ON* */


typedef struct
{
  u32 dpo_index;
} l2_lisp_gpe_tx_trace_t;

static u8 *
format_l2_lisp_gpe_tx_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  l2_lisp_gpe_tx_trace_t *t = va_arg (*args, l2_lisp_gpe_tx_trace_t *);

  s = format (s, "L2-LISP-GPE-TX: load-balance %d", t->dpo_index);
  return s;
}

/**
 * @brief LISP-GPE interface TX (encap) function for L2 overlays.
 * @node l2_lisp_gpe_interface_tx
 *
 * The L2 LISP-GPE interface TX (encap) function.
 *
 * Uses bridge domain index, source and destination ethernet addresses to
 * lookup tunnel. If the tunnel is multihomed a flow has is used to determine
 * the sub-tunnel and therefore the rewrite string to be used to encapsulate
 * the packets.
 *
 * @param[in]   vm        vlib_main_t corresponding to the current thread.
 * @param[in]   node      vlib_node_runtime_t data for this node.
 * @param[in]   frame     vlib_frame_t whose contents should be dispatched.
 *
 * @return number of vectors in frame.
 */
static uword
l2_lisp_gpe_interface_tx (vlib_main_t * vm, vlib_node_runtime_t * node,
			  vlib_frame_t * from_frame)
{
  u32 n_left_from, next_index, *from, *to_next;
  lisp_gpe_main_t *lgm = &lisp_gpe_main;
  u32 thread_index = vm->thread_index;
  vlib_combined_counter_main_t *cm = &load_balance_main.lbm_to_counters;

  from = vlib_frame_vector_args (from_frame);
  n_left_from = from_frame->n_vectors;

  next_index = node->cached_next_index;

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  vlib_buffer_t *b0;
	  u32 bi0, lbi0;
	  ethernet_header_t *e0;

	  bi0 = from[0];
	  to_next[0] = bi0;
	  from += 1;
	  to_next += 1;
	  n_left_from -= 1;
	  n_left_to_next -= 1;

	  b0 = vlib_get_buffer (vm, bi0);
	  e0 = vlib_buffer_get_current (b0);

	  vnet_buffer (b0)->lisp.overlay_afi = LISP_AFI_MAC;

	  /* lookup dst + src mac */
	  lbi0 = lisp_l2_fib_lookup (lgm, vnet_buffer (b0)->l2.bd_index,
				     e0->src_address, e0->dst_address);
	  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = lbi0;

	  vlib_increment_combined_counter (cm, thread_index, lbi0, 1,
					   vlib_buffer_length_in_chain (vm,
									b0));
	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      l2_lisp_gpe_tx_trace_t *tr = vlib_add_trace (vm, node, b0,
							   sizeof (*tr));
	      tr->dpo_index = lbi0;
	    }
	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
					   n_left_to_next, bi0, l2_arc_to_lb);
	}

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  return from_frame->n_vectors;
}

static u8 *
format_l2_lisp_gpe_name (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  return format (s, "l2_lisp_gpe%d", dev_instance);
}

/* *INDENT-OFF* */
VNET_DEVICE_CLASS (l2_lisp_gpe_device_class,static) = {
  .name = "L2_LISP_GPE",
  .format_device_name = format_l2_lisp_gpe_name,
  .format_tx_trace = format_l2_lisp_gpe_tx_trace,
  .tx_function = l2_lisp_gpe_interface_tx,
};
/* *INDENT-ON* */

typedef struct
{
  u32 dpo_index;
} nsh_lisp_gpe_tx_trace_t;

u8 *
format_nsh_lisp_gpe_tx_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  nsh_lisp_gpe_tx_trace_t *t = va_arg (*args, nsh_lisp_gpe_tx_trace_t *);

  s = format (s, "NSH-GPE-TX: tunnel %d", t->dpo_index);
  return s;
}

/**
 * @brief LISP-GPE interface TX for NSH overlays.
 * @node nsh_lisp_gpe_interface_tx
 *
 * The NSH LISP-GPE interface TX function.
 *
 * @param[in]   vm        vlib_main_t corresponding to the current thread.
 * @param[in]   node      vlib_node_runtime_t data for this node.
 * @param[in]   frame     vlib_frame_t whose contents should be dispatched.
 *
 * @return number of vectors in frame.
 */
static uword
nsh_lisp_gpe_interface_tx (vlib_main_t * vm, vlib_node_runtime_t * node,
			   vlib_frame_t * from_frame)
{
  u32 n_left_from, next_index, *from, *to_next;
  lisp_gpe_main_t *lgm = &lisp_gpe_main;

  from = vlib_frame_vector_args (from_frame);
  n_left_from = from_frame->n_vectors;

  next_index = node->cached_next_index;

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  vlib_buffer_t *b0;
	  u32 bi0;
	  u32 *nsh0, next0;
	  const dpo_id_t *dpo0;

	  bi0 = from[0];
	  to_next[0] = bi0;
	  from += 1;
	  to_next += 1;
	  n_left_from -= 1;
	  n_left_to_next -= 1;

	  b0 = vlib_get_buffer (vm, bi0);
	  nsh0 = vlib_buffer_get_current (b0);

	  vnet_buffer (b0)->lisp.overlay_afi = LISP_AFI_LCAF;

	  /* lookup SPI + SI (second word of the NSH header).
	   * NB: Load balancing was done by the control plane */
	  dpo0 = lisp_nsh_fib_lookup (lgm, nsh0[1]);

	  next0 = dpo0->dpoi_next_node;
	  vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;

	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      nsh_lisp_gpe_tx_trace_t *tr = vlib_add_trace (vm, node, b0,
							    sizeof (*tr));
	      tr->dpo_index = dpo0->dpoi_index;
	    }
	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
					   n_left_to_next, bi0, next0);
	}

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  return from_frame->n_vectors;
}

static u8 *
format_nsh_lisp_gpe_name (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  return format (s, "nsh_lisp_gpe%d", dev_instance);
}

/* *INDENT-OFF* */
VNET_DEVICE_CLASS (nsh_lisp_gpe_device_class,static) = {
  .name = "NSH_LISP_GPE",
  .format_device_name = format_nsh_lisp_gpe_name,
  .format_tx_trace = format_nsh_lisp_gpe_tx_trace,
  .tx_function = nsh_lisp_gpe_interface_tx,
};
/* *INDENT-ON* */

static vnet_hw_interface_t *
lisp_gpe_create_iface (lisp_gpe_main_t * lgm, u32 vni, u32 dp_table,
		       vnet_device_class_t * dev_class,
		       tunnel_lookup_t * tuns)
{
  u32 flen;
  u32 hw_if_index = ~0;
  u8 *new_name;
  vnet_hw_interface_t *hi;
  vnet_main_t *vnm = lgm->vnet_main;

  /* create hw lisp_gpeX iface if needed, otherwise reuse existing */
  flen = vec_len (lgm->free_tunnel_hw_if_indices);
  if (flen > 0)
    {
      hw_if_index = lgm->free_tunnel_hw_if_indices[flen - 1];
      _vec_len (lgm->free_tunnel_hw_if_indices) -= 1;

      hi = vnet_get_hw_interface (vnm, hw_if_index);

      /* rename interface */
      new_name = format (0, "%U", dev_class->format_device_name, vni);

      vec_add1 (new_name, 0);
      vnet_rename_interface (vnm, hw_if_index, (char *) new_name);
      vec_free (new_name);

      /* clear old stats of freed interface before reuse */
      vnet_interface_main_t *im = &vnm->interface_main;
      vnet_interface_counter_lock (im);
      vlib_zero_combined_counter (&im->combined_sw_if_counters
				  [VNET_INTERFACE_COUNTER_TX],
				  hi->sw_if_index);
      vlib_zero_combined_counter (&im->combined_sw_if_counters
				  [VNET_INTERFACE_COUNTER_RX],
				  hi->sw_if_index);
      vlib_zero_simple_counter (&im->sw_if_counters
				[VNET_INTERFACE_COUNTER_DROP],
				hi->sw_if_index);
      vnet_interface_counter_unlock (im);
    }
  else
    {
      hw_if_index = vnet_register_interface (vnm, dev_class->index, vni,
					     lisp_gpe_hw_class.index, 0);
      hi = vnet_get_hw_interface (vnm, hw_if_index);
    }

  hash_set (tuns->hw_if_index_by_dp_table, dp_table, hw_if_index);

  /* set tunnel termination: post decap, packets are tagged as having been
   * originated by lisp-gpe interface */
  hash_set (tuns->sw_if_index_by_vni, vni, hi->sw_if_index);
  hash_set (tuns->vni_by_sw_if_index, hi->sw_if_index, vni);

  return hi;
}

static void
lisp_gpe_remove_iface (lisp_gpe_main_t * lgm, u32 hi_index, u32 dp_table,
		       tunnel_lookup_t * tuns)
{
  vnet_main_t *vnm = lgm->vnet_main;
  vnet_hw_interface_t *hi;
  uword *vnip;

  hi = vnet_get_hw_interface (vnm, hi_index);

  /* disable interface */
  vnet_sw_interface_set_flags (vnm, hi->sw_if_index, 0 /* down */ );
  vnet_hw_interface_set_flags (vnm, hi->hw_if_index, 0 /* down */ );
  hash_unset (tuns->hw_if_index_by_dp_table, dp_table);
  vec_add1 (lgm->free_tunnel_hw_if_indices, hi->hw_if_index);

  /* clean tunnel termination and vni to sw_if_index binding */
  vnip = hash_get (tuns->vni_by_sw_if_index, hi->sw_if_index);
  if (0 == vnip)
    {
      clib_warning ("No vni associated to interface %d", hi->sw_if_index);
      return;
    }
  hash_unset (tuns->sw_if_index_by_vni, vnip[0]);
  hash_unset (tuns->vni_by_sw_if_index, hi->sw_if_index);
}

static void
lisp_gpe_iface_set_table (u32 sw_if_index, u32 table_id)
{
  fib_node_index_t fib_index;

  fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, table_id,
						 FIB_SOURCE_LISP);
  vec_validate (ip4_main.fib_index_by_sw_if_index, sw_if_index);
  ip4_main.fib_index_by_sw_if_index[sw_if_index] = fib_index;
  ip4_sw_interface_enable_disable (sw_if_index, 1);

  fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, table_id,
						 FIB_SOURCE_LISP);
  vec_validate (ip6_main.fib_index_by_sw_if_index, sw_if_index);
  ip6_main.fib_index_by_sw_if_index[sw_if_index] = fib_index;
  ip6_sw_interface_enable_disable (sw_if_index, 1);
}

static void
lisp_gpe_tenant_del_default_routes (u32 table_id)
{
  fib_protocol_t proto;

  FOR_EACH_FIB_IP_PROTOCOL (proto)
  {
    fib_prefix_t prefix = {
      .fp_proto = proto,
    };
    u32 fib_index;

    fib_index = fib_table_find (prefix.fp_proto, table_id);
    fib_table_entry_special_remove (fib_index, &prefix, FIB_SOURCE_LISP);
    fib_table_unlock (fib_index, prefix.fp_proto, FIB_SOURCE_LISP);
  }
}

static void
lisp_gpe_tenant_add_default_routes (u32 table_id)
{
  fib_protocol_t proto;

  FOR_EACH_FIB_IP_PROTOCOL (proto)
  {
    fib_prefix_t prefix = {
      .fp_proto = proto,
    };
    u32 fib_index;

    /*
     * Add a deafult route that results in a control plane punt DPO
     */
    fib_index = fib_table_find_or_create_and_lock (prefix.fp_proto, table_id,
						   FIB_SOURCE_LISP);
    fib_table_entry_special_dpo_add (fib_index, &prefix, FIB_SOURCE_LISP,
				     FIB_ENTRY_FLAG_EXCLUSIVE,
				     lisp_cp_dpo_get (fib_proto_to_dpo
						      (proto)));
  }
}


/**
 * @brief Add/del LISP-GPE L3 interface.
 *
 * Creates LISP-GPE interface, sets ingress arcs from lisp_gpeX_lookup,
 * installs default routes that attract all traffic with no more specific
 * routes to lgpe-ipx-lookup, set egress arcs to ipx-lookup, sets
 * the interface in the right vrf and enables it.
 *
 * @param[in]   lgm     Reference to @ref lisp_gpe_main_t.
 * @param[in]   a       Parameters to create interface.
 *
 * @return number of vectors in frame.
 */
u32
lisp_gpe_add_l3_iface (lisp_gpe_main_t * lgm, u32 vni, u32 table_id,
		       u8 with_default_routes)
{
  vnet_main_t *vnm = lgm->vnet_main;
  tunnel_lookup_t *l3_ifaces = &lgm->l3_ifaces;
  vnet_hw_interface_t *hi;
  uword *hip, *si;

  hip = hash_get (l3_ifaces->hw_if_index_by_dp_table, table_id);

  if (hip)
    {
      clib_warning ("vrf %d already mapped to a vni", table_id);
      return ~0;
    }

  si = hash_get (l3_ifaces->sw_if_index_by_vni, vni);

  if (si)
    {
      clib_warning ("Interface for vni %d already exists", vni);
    }

  /* create lisp iface and populate tunnel tables */
  hi = lisp_gpe_create_iface (lgm, vni, table_id,
			      &lisp_gpe_device_class, l3_ifaces);

  /* insert default routes that point to lisp-cp lookup */
  lisp_gpe_iface_set_table (hi->sw_if_index, table_id);
  if (with_default_routes)
    lisp_gpe_tenant_add_default_routes (table_id);

  /* enable interface */
  vnet_sw_interface_set_flags (vnm, hi->sw_if_index,
			       VNET_SW_INTERFACE_FLAG_ADMIN_UP);
  vnet_hw_interface_set_flags (vnm, hi->hw_if_index,
			       VNET_HW_INTERFACE_FLAG_LINK_UP);

  return (hi->sw_if_index);
}

void
lisp_gpe_del_l3_iface (lisp_gpe_main_t * lgm, u32 vni, u32 table_id)
{
  vnet_main_t *vnm = lgm->vnet_main;
  tunnel_lookup_t *l3_ifaces = &lgm->l3_ifaces;
  vnet_hw_interface_t *hi;
  uword *hip;

  hip = hash_get (l3_ifaces->hw_if_index_by_dp_table, table_id);

  if (hip == 0)
    {
      clib_warning ("The interface for vrf %d doesn't exist", table_id);
      return;
    }

  hi = vnet_get_hw_interface (vnm, hip[0]);

  lisp_gpe_remove_iface (lgm, hip[0], table_id, &lgm->l3_ifaces);

  /* unset default routes */
  ip4_sw_interface_enable_disable (hi->sw_if_index, 0);
  ip6_sw_interface_enable_disable (hi->sw_if_index, 0);
  lisp_gpe_tenant_del_default_routes (table_id);
}

/**
 * @brief Add/del LISP-GPE L2 interface.
 *
 * Creates LISP-GPE interface, sets it in L2 mode in the appropriate
 * bridge domain, sets egress arcs and enables it.
 *
 * @param[in]   lgm     Reference to @ref lisp_gpe_main_t.
 * @param[in]   a       Parameters to create interface.
 *
 * @return number of vectors in frame.
 */
u32
lisp_gpe_add_l2_iface (lisp_gpe_main_t * lgm, u32 vni, u32 bd_id)
{
  vnet_main_t *vnm = lgm->vnet_main;
  tunnel_lookup_t *l2_ifaces = &lgm->l2_ifaces;
  vnet_hw_interface_t *hi;
  uword *hip, *si;
  u16 bd_index;

  if (bd_id > L2_BD_ID_MAX)
    {
      clib_warning ("bridge domain ID %d exceed 16M limit", bd_id);
      return ~0;
    }

  bd_index = bd_find_or_add_bd_index (&bd_main, bd_id);
  hip = hash_get (l2_ifaces->hw_if_index_by_dp_table, bd_index);

  if (hip)
    {
      clib_warning ("bridge domain %d already mapped to a vni", bd_id);
      return ~0;
    }

  si = hash_get (l2_ifaces->sw_if_index_by_vni, vni);
  if (si)
    {
      clib_warning ("Interface for vni %d already exists", vni);
      return ~0;
    }

  /* create lisp iface and populate tunnel tables */
  hi = lisp_gpe_create_iface (lgm, vni, bd_index,
			      &l2_lisp_gpe_device_class, &lgm->l2_ifaces);

  /* enable interface */
  vnet_sw_interface_set_flags (vnm, hi->sw_if_index,
			       VNET_SW_INTERFACE_FLAG_ADMIN_UP);
  vnet_hw_interface_set_flags (vnm, hi->hw_if_index,
			       VNET_HW_INTERFACE_FLAG_LINK_UP);

  l2_arc_to_lb = vlib_node_add_named_next (vlib_get_main (),
					   hi->tx_node_index,
					   "l2-load-balance");

  /* we're ready. add iface to l2 bridge domain */
  set_int_l2_mode (lgm->vlib_main, vnm, MODE_L2_BRIDGE, hi->sw_if_index,
		   bd_index, L2_BD_PORT_TYPE_NORMAL, 0, 0);

  return (hi->sw_if_index);
}

/**
 * @brief Add/del LISP-GPE L2 interface.
 *
 * Creates LISP-GPE interface, sets it in L2 mode in the appropriate
 * bridge domain, sets egress arcs and enables it.
 *
 * @param[in]   lgm     Reference to @ref lisp_gpe_main_t.
 * @param[in]   a       Parameters to create interface.
 *
 * @return number of vectors in frame.
 */
void
lisp_gpe_del_l2_iface (lisp_gpe_main_t * lgm, u32 vni, u32 bd_id)
{
  tunnel_lookup_t *l2_ifaces = &lgm->l2_ifaces;
  vnet_hw_interface_t *hi;

  u32 bd_index = bd_find_index (&bd_main, bd_id);
  ASSERT (bd_index != ~0);
  uword *hip = hash_get (l2_ifaces->hw_if_index_by_dp_table, bd_index);

  if (hip == 0)
    {
      clib_warning ("The interface for bridge domain %d doesn't exist",
		    bd_id);
      return;
    }

  /* Remove interface from bridge .. by enabling L3 mode */
  hi = vnet_get_hw_interface (lgm->vnet_main, hip[0]);
  set_int_l2_mode (lgm->vlib_main, lgm->vnet_main, MODE_L3, hi->sw_if_index,
		   0, L2_BD_PORT_TYPE_NORMAL, 0, 0);
  lisp_gpe_remove_iface (lgm, hip[0], bd_index, &lgm->l2_ifaces);
}

/**
 * @brief Add LISP-GPE NSH interface.
 *
 * Creates LISP-GPE interface, sets it in L3 mode.
 *
 * @param[in]   lgm     Reference to @ref lisp_gpe_main_t.
 * @param[in]   a       Parameters to create interface.
 *
 * @return sw_if_index.
 */
u32
vnet_lisp_gpe_add_nsh_iface (lisp_gpe_main_t * lgm)
{
  vnet_main_t *vnm = lgm->vnet_main;
  tunnel_lookup_t *nsh_ifaces = &lgm->nsh_ifaces;
  vnet_hw_interface_t *hi;
  uword *hip, *si;

  hip = hash_get (nsh_ifaces->hw_if_index_by_dp_table, 0);

  if (hip)
    {
      clib_warning ("NSH interface 0 already exists");
      return ~0;
    }

  si = hash_get (nsh_ifaces->sw_if_index_by_vni, 0);
  if (si)
    {
      clib_warning ("NSH interface already exists");
      return ~0;
    }

  /* create lisp iface and populate tunnel tables */
  hi = lisp_gpe_create_iface (lgm, 0, 0,
			      &nsh_lisp_gpe_device_class, &lgm->nsh_ifaces);

  /* enable interface */
  vnet_sw_interface_set_flags (vnm, hi->sw_if_index,
			       VNET_SW_INTERFACE_FLAG_ADMIN_UP);
  vnet_hw_interface_set_flags (vnm, hi->hw_if_index,
			       VNET_HW_INTERFACE_FLAG_LINK_UP);

  return (hi->sw_if_index);
}

/**
 * @brief Del LISP-GPE NSH interface.
 *
 */
void
vnet_lisp_gpe_del_nsh_iface (lisp_gpe_main_t * lgm)
{
  tunnel_lookup_t *nsh_ifaces = &lgm->nsh_ifaces;
  uword *hip;

  hip = hash_get (nsh_ifaces->hw_if_index_by_dp_table, 0);

  if (hip == 0)
    {
      clib_warning ("The NSH 0 interface doesn't exist");
      return;
    }
  lisp_gpe_remove_iface (lgm, hip[0], 0, &lgm->nsh_ifaces);
}

static clib_error_t *
lisp_gpe_add_del_iface_command_fn (vlib_main_t * vm, unformat_input_t * input,
				   vlib_cli_command_t * cmd)
{
  unformat_input_t _line_input, *line_input = &_line_input;
  u8 is_add = 1;
  u32 table_id, vni, bd_id;
  u8 vni_is_set = 0, vrf_is_set = 0, bd_index_is_set = 0;
  u8 nsh_iface = 0;
  clib_error_t *error = NULL;

  if (vnet_lisp_gpe_enable_disable_status () == 0)
    {
      return clib_error_return (0, "LISP is disabled");
    }

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "add"))
	is_add = 1;
      else if (unformat (line_input, "del"))
	is_add = 0;
      else if (unformat (line_input, "vrf %d", &table_id))
	{
	  vrf_is_set = 1;
	}
      else if (unformat (line_input, "vni %d", &vni))
	{
	  vni_is_set = 1;
	}
      else if (unformat (line_input, "bd %d", &bd_id))
	{
	  bd_index_is_set = 1;
	}
      else if (unformat (line_input, "nsh"))
	{
	  nsh_iface = 1;
	}
      else
	{
	  error = clib_error_return (0, "parse error: '%U'",
				     format_unformat_error, line_input);
	  goto done;
	}
    }

  if (nsh_iface)
    {
      if (is_add)
	{
	  if (~0 == vnet_lisp_gpe_add_nsh_iface (&lisp_gpe_main))
	    {
	      error = clib_error_return (0, "NSH interface not created");
	      goto done;
	    }
	}
      else
	{
	  vnet_lisp_gpe_del_nsh_iface (&lisp_gpe_main);
	}
      goto done;
    }

  if (vrf_is_set && bd_index_is_set)
    {
      error = clib_error_return
	(0, "Cannot set both vrf and brdige domain index!");
      goto done;
    }

  if (!vni_is_set)
    {
      error = clib_error_return (0, "vni must be set!");
      goto done;
    }

  if (!vrf_is_set && !bd_index_is_set)
    {
      error =
	clib_error_return (0, "vrf or bridge domain index must be set!");
      goto done;
    }

  if (bd_index_is_set)
    {
      if (is_add)
	{
	  if (~0 == lisp_gpe_tenant_l2_iface_add_or_lock (vni, bd_id))
	    {
	      error = clib_error_return (0, "L2 interface not created");
	      goto done;
	    }
	}
      else
	lisp_gpe_tenant_l2_iface_unlock (vni);
    }
  else
    {
      if (is_add)
	{
	  if (~0 == lisp_gpe_tenant_l3_iface_add_or_lock (vni, table_id, 1
							  /* with_default_route */
	      ))
	    {
	      error = clib_error_return (0, "L3 interface not created");
	      goto done;
	    }
	}
      else
	lisp_gpe_tenant_l3_iface_unlock (vni);
    }

done:
  unformat_free (line_input);

  return error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (add_del_lisp_gpe_iface_command, static) = {
  .path = "gpe iface",
  .short_help = "gpe iface add/del vni <vni> vrf <vrf>",
  .function = lisp_gpe_add_del_iface_command_fn,
};
/* *INDENT-ON* */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */