aboutsummaryrefslogtreecommitdiffstats
path: root/src/plugins/srmpls/sr_mpls_steering.c
blob: 24c8b0e2d9f8dd86f8a0dc8b48503412f7fe30e9 (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
/*
 * sr_steering.c: ipv6 segment routing steering into SR policy
 *
 * 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 Packet steering into SR-MPLS Policies
 *
 * This file is in charge of handling the FIB appropiatly to steer packets
 * through SR Policies as defined in 'sr_mpls_policy.c'. Notice that here
 * we are only doing steering. SR policy application is done in
 * sr_policy_rewrite.c
 *
 * Supports:
 *  - Steering of IPv6 traffic Destination Address based through BSID
 *  - Steering of IPv4 traffic Destination Address based through BSID
 *  - Steering of IPv4 and IPv6 traffic through N,C (SR CP)
 */

#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include "sr_mpls.h"
#include <vnet/ip/ip4_packet.h>
#include <vnet/ip/ip6_packet.h>
#include <vnet/fib/mpls_fib.h>

#include <vppinfra/error.h>
#include <vppinfra/elog.h>

#define SRMPLS_TE_OFFSET 50

/**
 * @brief function to sort the colors in descending order
 */
int
sort_color_descent (const u32 * x, u32 * y)
{
  return *y - *x;
}

/********************* Internal (NH, C) labels *******************************/
/**
 * @brief find the corresponding label for (endpoint, color) and lock it
 * endpoint might be NULL or ANY
 * NULL = 0, ANY=~0
 */
u32
find_or_create_internal_label (ip46_address_t endpoint, u32 color)
{
  mpls_sr_main_t *sm = &sr_mpls_main;
  uword *color_table, *result_label;

  if (!sm->sr_policies_c2e2eclabel_hash.hash)
    mhash_init (&sm->sr_policies_c2e2eclabel_hash, sizeof (mhash_t),
		sizeof (u32));

  color_table = mhash_get (&sm->sr_policies_c2e2eclabel_hash, &color);
  if (!color_table)
    {
      mhash_t color_t;
      clib_memset (&color_t, 0, sizeof (mhash_t));
      mhash_init (&color_t, sizeof (u32), sizeof (ip46_address_t));
      mhash_set_mem (&sm->sr_policies_c2e2eclabel_hash, &color,
		     (uword *) & color_t, NULL);
      color_table = mhash_get (&sm->sr_policies_c2e2eclabel_hash, &color);
    }

  result_label = mhash_get ((mhash_t *) color_table, &endpoint);

  if (result_label)
    return (u32) * result_label;

  /* Create and set a new internal label */
  u32 *new_internal_label = 0;
  pool_get (sm->ec_labels, new_internal_label);
  *new_internal_label = 0;
  mhash_set ((mhash_t *) color_table, &endpoint,
	     (new_internal_label - sm->ec_labels) + SRMPLS_TE_OFFSET, NULL);

  return (new_internal_label - sm->ec_labels) + SRMPLS_TE_OFFSET;
}

always_inline void
internal_label_lock_co (ip46_address_t endpoint, u32 color, char co_bits)
{
  ip46_address_t zero, any;
  ip46_address_reset (&zero);
  any.as_u64[0] = any.as_u64[1] = (u64) ~ 0;
  switch (co_bits)
    {
    case SR_TE_CO_BITS_10:
      internal_label_lock (endpoint, color);
      internal_label_lock (zero, color);
      internal_label_lock (any, color);
      break;
    case SR_TE_CO_BITS_01:
      internal_label_lock (endpoint, color);
      internal_label_lock (zero, color);
      break;
    case SR_TE_CO_BITS_00:
    case SR_TE_CO_BITS_11:
      internal_label_lock (endpoint, color);
      break;
    }
}

/**
 * @brief lock the label for (NH, C)
 * endpoint might be NULL or ANY
 * NULL = 0, ANY=~0
 */
void
internal_label_lock (ip46_address_t endpoint, u32 color)
{
  mpls_sr_main_t *sm = &sr_mpls_main;
  uword *color_table, *result_label;

  if (!sm->sr_policies_c2e2eclabel_hash.hash)
    return;

  color_table = mhash_get (&sm->sr_policies_c2e2eclabel_hash, &color);
  if (!color_table)
    return;

  result_label = mhash_get ((mhash_t *) color_table, &endpoint);

  if (!result_label)
    return;

  /* Lock it */
  u32 *label_lock =
    pool_elt_at_index (sm->ec_labels, *result_label - SRMPLS_TE_OFFSET);
  (*label_lock)++;
}


always_inline void
internal_label_unlock_co (ip46_address_t endpoint, u32 color, char co_bits)
{
  ip46_address_t zero, any;
  ip46_address_reset (&zero);
  any.as_u64[0] = any.as_u64[1] = (u64) ~ 0;
  switch (co_bits)
    {
    case SR_TE_CO_BITS_10:
      internal_label_unlock (endpoint, color);
      internal_label_unlock (zero, color);
      internal_label_unlock (any, color);
      break;
    case SR_TE_CO_BITS_01:
      internal_label_unlock (endpoint, color);
      internal_label_unlock (zero, color);
      break;
    case SR_TE_CO_BITS_00:
    case SR_TE_CO_BITS_11:
      internal_label_unlock (endpoint, color);
      break;
    }
}

/**
 * @brief Release lock on label for (endpoint, color)
 * endpoint might be NULL or ANY
 * NULL = 0, ANY=~0
 */
void
internal_label_unlock (ip46_address_t endpoint, u32 color)
{
  mpls_sr_main_t *sm = &sr_mpls_main;
  uword *color_table, *result_label;

  if (!sm->sr_policies_c2e2eclabel_hash.hash)
    return;

  color_table = mhash_get (&sm->sr_policies_c2e2eclabel_hash, &color);
  if (!color_table)
    return;

  result_label = mhash_get ((mhash_t *) color_table, &endpoint);

  if (!result_label)
    return;

  u32 *label_lock =
    pool_elt_at_index (sm->ec_labels, *result_label - SRMPLS_TE_OFFSET);
  (*label_lock)--;

  if (*label_lock == 0)
    {
      pool_put (sm->ec_labels, label_lock);
      mhash_unset ((mhash_t *) color_table, &endpoint, NULL);
      if (mhash_elts ((mhash_t *) color_table) == 0)
	{
	  mhash_free ((mhash_t *) color_table);
	  mhash_unset (&sm->sr_policies_c2e2eclabel_hash, &color, NULL);
	  if (mhash_elts (&sm->sr_policies_c2e2eclabel_hash) == 0)
	    {
	      mhash_free (&sm->sr_policies_c2e2eclabel_hash);
	      sm->sr_policies_c2e2eclabel_hash.hash = NULL;
	      fib_table_unlock (sm->fib_table_EC, FIB_PROTOCOL_MPLS,
				FIB_SOURCE_SR);
	      sm->fib_table_EC = (u32) ~ 0;
	    }
	}
    }
}

/********************* steering computation  *********************************/
/**
 * @brief function to update the FIB
 */
void
compute_sr_te_automated_steering_fib_entry (mpls_sr_steering_policy_t *
					    steer_pl)
{
  mpls_sr_main_t *sm = &sr_mpls_main;
  fib_prefix_t pfx = { 0 };

  u32 *internal_labels = 0;
  ip46_address_t zero, any;
  ip46_address_reset (&zero);
  any.as_u64[0] = any.as_u64[1] = (u64) ~ 0;

  u32 *color_i = NULL;
  vec_foreach (color_i, steer_pl->color)
  {
    switch (steer_pl->co_bits)
      {
      case SR_TE_CO_BITS_10:
	vec_add1 (internal_labels,
		  find_or_create_internal_label (steer_pl->next_hop,
						 *color_i));
	vec_add1 (internal_labels,
		  find_or_create_internal_label (zero, *color_i));
	vec_add1 (internal_labels,
		  find_or_create_internal_label (any, *color_i));
	break;
      case SR_TE_CO_BITS_01:
	vec_add1 (internal_labels,
		  find_or_create_internal_label (steer_pl->next_hop,
						 *color_i));
	vec_add1 (internal_labels,
		  find_or_create_internal_label (zero, *color_i));
	break;
      case SR_TE_CO_BITS_00:
      case SR_TE_CO_BITS_11:
	vec_add1 (internal_labels,
		  find_or_create_internal_label (steer_pl->next_hop,
						 *color_i));
	break;
      }
  }

  /* Does hidden FIB already exist? */
  if (sm->fib_table_EC == (u32) ~ 0)
    {
      sm->fib_table_EC = fib_table_create_and_lock (FIB_PROTOCOL_MPLS,
						    FIB_SOURCE_SR,
						    "SR-MPLS Traffic Engineering (NextHop,Color)");

      fib_table_flush (sm->fib_table_EC, FIB_PROTOCOL_MPLS,
		       FIB_SOURCE_SPECIAL);
    }

  /* Add the corresponding FIB entries */
  fib_route_path_t path = {
    .frp_proto = DPO_PROTO_MPLS,
    .frp_eos = MPLS_EOS,
    .frp_sw_if_index = ~0,
    .frp_fib_index = sm->fib_table_EC,
    .frp_weight = 1,
    .frp_flags = FIB_ROUTE_PATH_FLAG_NONE,
    .frp_label_stack = 0
  };
  fib_route_path_t *paths = NULL;

  if (steer_pl->classify.traffic_type == SR_STEER_IPV6)
    {
      pfx.fp_proto = FIB_PROTOCOL_IP6;
      pfx.fp_len = steer_pl->classify.mask_width;
      pfx.fp_addr.ip6 = steer_pl->classify.prefix.ip6;
    }
  else if (steer_pl->classify.traffic_type == SR_STEER_IPV4)
    {
      pfx.fp_proto = FIB_PROTOCOL_IP4;
      pfx.fp_len = steer_pl->classify.mask_width;
      pfx.fp_addr.ip4 = steer_pl->classify.prefix.ip4;
    }

  if (steer_pl->vpn_label != (u32) ~ 0)
    {
      fib_mpls_label_t fml = {
	.fml_value = steer_pl->vpn_label,
      };
      vec_add1 (path.frp_label_stack, fml);
      path.frp_eos = MPLS_NON_EOS;
    }

  u32 label_i;
  vec_foreach_index (label_i, internal_labels)
  {
    path.frp_local_label = internal_labels[label_i];
    path.frp_preference = label_i;
    vec_add1 (paths, path);
  }

  /* Finally we must add to FIB IGP to N */
  clib_memcpy (&path.frp_addr, &steer_pl->next_hop,
	       sizeof (steer_pl->next_hop));
  path.frp_preference = vec_len (internal_labels);
  path.frp_label_stack = NULL;

  if (steer_pl->nh_type == SR_STEER_IPV6)
    {
      path.frp_proto = DPO_PROTO_IP6;
      path.frp_fib_index =
	fib_table_find (FIB_PROTOCOL_IP6,
			(steer_pl->classify.fib_table !=
			 (u32) ~ 0 ? steer_pl->classify.fib_table : 0));
    }
  else if (steer_pl->nh_type == SR_STEER_IPV4)
    {
      path.frp_proto = DPO_PROTO_IP4;
      path.frp_fib_index =
	fib_table_find (FIB_PROTOCOL_IP4,
			(steer_pl->classify.fib_table !=
			 (u32) ~ 0 ? steer_pl->classify.fib_table : 0));
    }

  vec_add1 (paths, path);
  if (steer_pl->classify.traffic_type == SR_STEER_IPV6)
    fib_table_entry_update (fib_table_find
			    (FIB_PROTOCOL_IP6,
			     (steer_pl->classify.fib_table !=
			      (u32) ~ 0 ? steer_pl->classify.fib_table : 0)),
			    &pfx, FIB_SOURCE_SR,
			    FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT, paths);
  else if (steer_pl->classify.traffic_type == SR_STEER_IPV4)
    fib_table_entry_update (fib_table_find
			    (FIB_PROTOCOL_IP4,
			     (steer_pl->classify.fib_table !=
			      (u32) ~ 0 ? steer_pl->classify.fib_table : 0)),
			    &pfx, FIB_SOURCE_SR,
			    FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT, paths);

  vec_free (paths);
  paths = NULL;
}

/**
 * @brief Steer traffic L3 traffic through a given SR-MPLS policy
 *
 * @param is_del
 * @param bsid is the bindingSID of the SR Policy (alt to sr_policy_index)
 * @param sr_policy is the index of the SR Policy (alt to bsid)
 * @param table_id is the VRF where to install the FIB entry for the BSID
 * @param prefix is the IPv4/v6 address for L3 traffic type
 * @param mask_width is the mask for L3 traffic type
 * @param traffic_type describes the type of traffic
 * @param next_hop SR TE Next-Hop
 * @param nh_type is the AF of Next-Hop
 * @param color SR TE color
 * @param co_bits SR TE color-only bits
 *
 * @return 0 if correct, else error
 */
int
sr_mpls_steering_policy_add (mpls_label_t bsid, u32 table_id,
			     ip46_address_t * prefix, u32 mask_width,
			     u8 traffic_type, ip46_address_t * next_hop,
			     u8 nh_type, u32 color, char co_bits,
			     mpls_label_t vpn_label)
{
  mpls_sr_main_t *sm = &sr_mpls_main;
  sr_mpls_steering_key_t key;
  mpls_sr_steering_policy_t *steer_pl;
  fib_prefix_t pfx = { 0 };

  mpls_sr_policy_t *sr_policy = 0;
  uword *p = 0;

  clib_memset (&key, 0, sizeof (sr_mpls_steering_key_t));

  if (traffic_type != SR_STEER_IPV4 && traffic_type != SR_STEER_IPV6)
    return -1;

  /* Compute the steer policy key */
  key.prefix.as_u64[0] = prefix->as_u64[0];
  key.prefix.as_u64[1] = prefix->as_u64[1];
  key.mask_width = mask_width;
  key.fib_table = (table_id != (u32) ~ 0 ? table_id : 0);
  key.traffic_type = traffic_type;

  /*
   * Search for steering policy. If already exists we are adding a new
   * color.
   */
  if (!sm->sr_steer_policies_hash.hash)
    mhash_init (&sm->sr_steer_policies_hash, sizeof (uword),
		sizeof (sr_mpls_steering_key_t));

  p = mhash_get (&sm->sr_steer_policies_hash, &key);
  if (p)
    {
      steer_pl = pool_elt_at_index (sm->steer_policies, p[0]);
      if (steer_pl->bsid != (u32) ~ 0)
	return -1;		//Means we are rewritting the steering. Not allowed.

      /* Means we are adding a color. Check that NH match. */
      if (ip46_address_cmp (&steer_pl->next_hop, next_hop))
	return -2;
      if (vec_search (steer_pl->color, color) != ~0)
	return -3;
      if (steer_pl->co_bits != co_bits)
	return -4;		/* CO colors should be the same */
      if (steer_pl->vpn_label != vpn_label)
	return -5;		/* VPN label should be the same */

      /* Remove the steering and ReDo it */
      vec_add1 (steer_pl->color, color);
      vec_sort_with_function (steer_pl->color, sort_color_descent);
      compute_sr_te_automated_steering_fib_entry (steer_pl);
      internal_label_lock_co (steer_pl->next_hop, color, steer_pl->co_bits);
      return 0;
    }

  /* Create a new steering policy */
  pool_get (sm->steer_policies, steer_pl);
  clib_memset (steer_pl, 0, sizeof (*steer_pl));
  clib_memcpy (&steer_pl->classify.prefix, prefix, sizeof (ip46_address_t));
  clib_memcpy (&steer_pl->next_hop, next_hop, sizeof (ip46_address_t));
  steer_pl->nh_type = nh_type;
  steer_pl->co_bits = co_bits;
  steer_pl->classify.mask_width = mask_width;
  steer_pl->classify.fib_table = (table_id != (u32) ~ 0 ? table_id : 0);
  steer_pl->classify.traffic_type = traffic_type;
  steer_pl->color = NULL;
  steer_pl->vpn_label = vpn_label;

  /* Create and store key */
  mhash_set (&sm->sr_steer_policies_hash, &key, steer_pl - sm->steer_policies,
	     NULL);

  /* Local steering */
  if (bsid != (u32) ~ 0)
    {
      if (!sm->sr_policies_index_hash)
	sm->sr_policies_index_hash = hash_create (0, sizeof (mpls_label_t));
      steer_pl->bsid = bsid;
      p = hash_get (sm->sr_policies_index_hash, bsid);
      if (!p)
	return -1;
      sr_policy = pool_elt_at_index (sm->sr_policies, p[0]);

      fib_route_path_t path = {
	.frp_proto = DPO_PROTO_MPLS,
	.frp_local_label = sr_policy->bsid,
	.frp_eos = MPLS_EOS,
	.frp_sw_if_index = ~0,
	.frp_fib_index = 0,
	.frp_weight = 1,
	.frp_flags = FIB_ROUTE_PATH_FLAG_NONE,
	.frp_label_stack = 0
      };
      fib_route_path_t *paths = NULL;

      if (steer_pl->vpn_label != (u32) ~ 0)
	{
	  fib_mpls_label_t fml = {
	    .fml_value = steer_pl->vpn_label,
	  };
	  vec_add1 (path.frp_label_stack, fml);
	}

      /* FIB API calls - Recursive route through the BindingSID */
      if (traffic_type == SR_STEER_IPV6)
	{
	  pfx.fp_proto = FIB_PROTOCOL_IP6;
	  pfx.fp_len = steer_pl->classify.mask_width;
	  pfx.fp_addr.ip6 = steer_pl->classify.prefix.ip6;
	  path.frp_fib_index = 0;
	  path.frp_preference = 0;
	  vec_add1 (paths, path);
	  fib_table_entry_path_add2 (fib_table_find
				     (FIB_PROTOCOL_IP6,
				      (table_id != (u32) ~ 0 ? table_id : 0)),
				     &pfx, FIB_SOURCE_SR,
				     FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT, paths);
	  vec_free (paths);
	}
      else if (traffic_type == SR_STEER_IPV4)
	{
	  pfx.fp_proto = FIB_PROTOCOL_IP4;
	  pfx.fp_len = steer_pl->classify.mask_width;
	  pfx.fp_addr.ip4 = steer_pl->classify.prefix.ip4;
	  path.frp_fib_index = 0;
	  path.frp_preference = 0;
	  vec_add1 (paths, path);
	  fib_table_entry_path_add2 (fib_table_find
				     (FIB_PROTOCOL_IP4,
				      (table_id != (u32) ~ 0 ? table_id : 0)),
				     &pfx, FIB_SOURCE_SR,
				     FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT, paths);
	  vec_free (paths);
	}
    }
  /* Automated steering */
  else
    {
      steer_pl->bsid = (u32) ~ 0;
      vec_add1 (steer_pl->color, color);
      compute_sr_te_automated_steering_fib_entry (steer_pl);
      internal_label_lock_co (steer_pl->next_hop, color, steer_pl->co_bits);
    }
  return 0;
}

/**
 * @brief Delete steering rule for an SR-MPLS policy
 *
 * @param is_del
 * @param bsid is the bindingSID of the SR Policy (alt to sr_policy_index)
 * @param sr_policy is the index of the SR Policy (alt to bsid)
 * @param table_id is the VRF where to install the FIB entry for the BSID
 * @param prefix is the IPv4/v6 address for L3 traffic type
 * @param mask_width is the mask for L3 traffic type
 * @param traffic_type describes the type of traffic
 * @param next_hop SR TE Next-HOP
 * @param nh_type is the AF of Next-Hop
 * @param color SR TE color
 *
 * @return 0 if correct, else error
 */
int
sr_mpls_steering_policy_del (ip46_address_t * prefix, u32 mask_width,
			     u8 traffic_type, u32 table_id, u32 color)
{
  mpls_sr_main_t *sm = &sr_mpls_main;
  sr_mpls_steering_key_t key;
  mpls_sr_steering_policy_t *steer_pl;
  fib_prefix_t pfx = { 0 };
  uword *p = 0;

  clib_memset (&key, 0, sizeof (sr_mpls_steering_key_t));

  /* Compute the steer policy key */
  if (traffic_type != SR_STEER_IPV4 && traffic_type != SR_STEER_IPV6)
    return -1;

  key.prefix.as_u64[0] = prefix->as_u64[0];
  key.prefix.as_u64[1] = prefix->as_u64[1];
  key.mask_width = mask_width;
  key.fib_table = (table_id != (u32) ~ 0 ? table_id : 0);
  key.traffic_type = traffic_type;

  if (!sm->sr_steer_policies_hash.hash)
    mhash_init (&sm->sr_steer_policies_hash, sizeof (uword),
		sizeof (sr_mpls_steering_key_t));

  /* Search for the item */
  p = mhash_get (&sm->sr_steer_policies_hash, &key);

  if (!p)
    return -1;

  /* Retrieve Steer Policy function */
  steer_pl = pool_elt_at_index (sm->steer_policies, p[0]);

  if (steer_pl->bsid == (u32) ~ 0)
    {
      /* Remove the color from the color vector */
      vec_del1 (steer_pl->color, vec_search (steer_pl->color, color));

      if (vec_len (steer_pl->color))
	{
	  /* Reorder Colors */
	  vec_sort_with_function (steer_pl->color, sort_color_descent);
	  compute_sr_te_automated_steering_fib_entry (steer_pl);
	  /* Remove all the locks for this ones... */
	  internal_label_unlock_co (steer_pl->next_hop, color,
				    steer_pl->co_bits);
	  return 0;
	}
      else
	{
	  vec_free (steer_pl->color);
	  /* Remove FIB entry */
	  if (steer_pl->classify.traffic_type == SR_STEER_IPV6)
	    {
	      pfx.fp_proto = FIB_PROTOCOL_IP6;
	      pfx.fp_len = steer_pl->classify.mask_width;
	      pfx.fp_addr.ip6 = steer_pl->classify.prefix.ip6;
	      fib_table_entry_delete (fib_table_find
				      (FIB_PROTOCOL_IP6,
				       steer_pl->classify.fib_table), &pfx,
				      FIB_SOURCE_SR);
	    }
	  else if (steer_pl->classify.traffic_type == SR_STEER_IPV4)
	    {
	      pfx.fp_proto = FIB_PROTOCOL_IP4;
	      pfx.fp_len = steer_pl->classify.mask_width;
	      pfx.fp_addr.ip4 = steer_pl->classify.prefix.ip4;
	      fib_table_entry_delete (fib_table_find
				      (FIB_PROTOCOL_IP4,
				       steer_pl->classify.fib_table), &pfx,
				      FIB_SOURCE_SR);
	    }
	  /* Remove all the locks for this ones... */
	  internal_label_unlock_co (steer_pl->next_hop, color,
				    steer_pl->co_bits);
	}
    }
  else				//Remove by BSID
    {
      if (steer_pl->classify.traffic_type == SR_STEER_IPV6)
	{
	  pfx.fp_proto = FIB_PROTOCOL_IP6;
	  pfx.fp_len = steer_pl->classify.mask_width;
	  pfx.fp_addr.ip6 = steer_pl->classify.prefix.ip6;
	  fib_table_entry_delete (fib_table_find
				  (FIB_PROTOCOL_IP6,
				   steer_pl->classify.fib_table), &pfx,
				  FIB_SOURCE_SR);
	}
      else if (steer_pl->classify.traffic_type == SR_STEER_IPV4)
	{
	  pfx.fp_proto = FIB_PROTOCOL_IP4;
	  pfx.fp_len = steer_pl->classify.mask_width;
	  pfx.fp_addr.ip4 = steer_pl->classify.prefix.ip4;
	  fib_table_entry_delete (fib_table_find
				  (FIB_PROTOCOL_IP4,
				   steer_pl->classify.fib_table), &pfx,
				  FIB_SOURCE_SR);
	}
    }
  /* Delete SR steering policy entry */
  pool_put (sm->steer_policies, steer_pl);
  mhash_unset (&sm->sr_steer_policies_hash, &key, NULL);
  if (mhash_elts (&sm->sr_steer_policies_hash) == 0)
    {
      mhash_free (&sm->sr_steer_policies_hash);
      sm->sr_steer_policies_hash.hash = NULL;
    }
  return 0;
}

static clib_error_t *
sr_mpls_steer_policy_command_fn (vlib_main_t * vm, unformat_input_t * input,
				 vlib_cli_command_t * cmd)
{
  int is_del = 0;

  ip46_address_t prefix, nh;
  u32 dst_mask_width = 0;
  u8 traffic_type = 0;
  u8 nh_type = 0;
  u32 fib_table = (u32) ~ 0, color = (u32) ~ 0;
  u32 co_bits = 0;

  mpls_label_t bsid, vpn_label = (u32) ~ 0;

  u8 sr_policy_set = 0;

  clib_memset (&prefix, 0, sizeof (ip46_address_t));
  clib_memset (&nh, 0, sizeof (ip46_address_t));

  int rv;
  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "del"))
	is_del = 1;
      else if (!traffic_type
	       && unformat (input, "l3 %U/%d", unformat_ip6_address,
			    &prefix.ip6, &dst_mask_width))
	traffic_type = SR_STEER_IPV6;
      else if (!traffic_type
	       && unformat (input, "l3 %U/%d", unformat_ip4_address,
			    &prefix.ip4, &dst_mask_width))
	traffic_type = SR_STEER_IPV4;
      else if (!sr_policy_set
	       && unformat (input, "via sr policy bsid %U",
			    unformat_mpls_unicast_label, &bsid))
	sr_policy_set = 1;
      else if (!sr_policy_set
	       && unformat (input, "via next-hop %U color %d co %d",
			    unformat_ip4_address, &nh.ip4, &color, &co_bits))
	{
	  sr_policy_set = 1;
	  nh_type = SR_STEER_IPV4;
	}
      else if (!sr_policy_set
	       && unformat (input, "via next-hop %U color %d co %d",
			    unformat_ip6_address, &nh.ip6, &color, &co_bits))
	{
	  sr_policy_set = 1;
	  nh_type = SR_STEER_IPV6;
	}
      else if (fib_table == (u32) ~ 0
	       && unformat (input, "fib-table %d", &fib_table));
      else if (unformat (input, "vpn-label %U",
			 unformat_mpls_unicast_label, &vpn_label));
      else
	break;
    }

  if (!traffic_type)
    return clib_error_return (0, "No L3 traffic specified");
  if (!sr_policy_set)
    return clib_error_return (0, "No SR policy specified");

  /* Make sure that the prefixes are clean */
  if (traffic_type == SR_STEER_IPV4)
    {
      u32 mask =
	(dst_mask_width ? (0xFFFFFFFFu >> (32 - dst_mask_width)) : 0);
      prefix.ip4.as_u32 &= mask;
    }
  else if (traffic_type == SR_STEER_IPV6)
    {
      ip6_address_t mask;
      ip6_address_mask_from_width (&mask, dst_mask_width);
      ip6_address_mask (&prefix.ip6, &mask);
    }

  if (nh_type)
    bsid = (u32) ~ 0;

  if (is_del)
    rv =
      sr_mpls_steering_policy_del (&prefix, dst_mask_width,
				   traffic_type, fib_table, color);

  else
    rv =
      sr_mpls_steering_policy_add (bsid, fib_table, &prefix, dst_mask_width,
				   traffic_type, &nh, nh_type, color, co_bits,
				   vpn_label);

  switch (rv)
    {
    case 0:
      break;
    case 1:
      return 0;
    case -1:
      return clib_error_return (0, "Incorrect API usage.");
    case -2:
      return clib_error_return (0, "The Next-Hop does not match.");
    case -3:
      return clib_error_return (0, "The color already exists.");
    case -4:
      return clib_error_return (0, "The co-bits do not match.");
    case -5:
      return clib_error_return (0, "The VPN-labels do not match.");
    default:
      return clib_error_return (0, "BUG: sr steer policy returns %d", rv);
    }
  return 0;
}

VLIB_CLI_COMMAND(sr_mpls_steer_policy_command, static)=
{
  .path = "sr mpls steer",
    .short_help = "sr mpls steer (del) l3 <ip_addr/mask> "
    "via [sr policy bsid <mpls_label> || next-hop <ip46_addr> color <u32> co <0|1|2|3> ](fib-table <fib_table_index>)(vpn-label 500)",
    .long_help =
    "\tSteer L3 traffic through an existing SR policy.\n"
    "\tExamples:\n"
    "\t\tsr steer l3 2001::/64 via sr_policy bsid 29999\n"
    "\t\tsr steer del l3 2001::/64 via sr_policy bsid 29999\n"
    "\t\tsr steer l3 2001::/64 via next-hop 1.1.1.1 color 1234 co 0\n"
    "\t\tsr steer l3 2001::/64 via next-hop 2001::1 color 1234 co 2 vpn-label 500\n",
    .function = sr_mpls_steer_policy_command_fn,
};

static clib_error_t *
show_sr_mpls_steering_policies_command_fn (vlib_main_t * vm,
					   unformat_input_t * input,
					   vlib_cli_command_t * cmd)
{
  mpls_sr_main_t *sm = &sr_mpls_main;
  mpls_sr_steering_policy_t **steer_policies = 0;
  mpls_sr_steering_policy_t *steer_pl;

  int i;

  vlib_cli_output (vm, "SR MPLS steering policies:");
  pool_foreach (steer_pl, sm->steer_policies)  {
    vec_add1(steer_policies, steer_pl);
  }
  for (i = 0; i < vec_len (steer_policies); i++)
    {
      vlib_cli_output (vm, "==========================");
      steer_pl = steer_policies[i];
      if (steer_pl->classify.traffic_type == SR_STEER_IPV4)
	{
	  vlib_cli_output (vm, "Prefix: %U/%d via:",
			   format_ip4_address,
			   &steer_pl->classify.prefix.ip4,
			   steer_pl->classify.mask_width);
	}
      else if (steer_pl->classify.traffic_type == SR_STEER_IPV6)
	{
	  vlib_cli_output (vm, "Prefix: %U/%d via:",
			   format_ip6_address,
			   &steer_pl->classify.prefix.ip6,
			   steer_pl->classify.mask_width);
	}

      if (steer_pl->bsid != (u32) ~ 0)
	{
	  vlib_cli_output (vm, "· BSID %U",
			   format_mpls_unicast_label, steer_pl->bsid);
	}
      else
	{
	  if (steer_pl->nh_type == SR_STEER_IPV4)
	    {
	      vlib_cli_output (vm, "· Next-hop %U",
			       format_ip4_address, &steer_pl->next_hop.ip4);
	    }
	  else if (steer_pl->nh_type == SR_STEER_IPV6)
	    {
	      vlib_cli_output (vm, "· Next-hop %U",
			       format_ip6_address, &steer_pl->next_hop.ip6);
	    }

	  u32 *color_i = 0;
	  u8 *s = NULL;
	  s = format (s, "[ ");
	  vec_foreach (color_i, steer_pl->color)
	  {
	    s = format (s, "%d, ", *color_i);
	  }
	  s = format (s, "\b\b ]");
	  vlib_cli_output (vm, "· Color %s", s);

	  switch (steer_pl->co_bits)
	    {
	    case SR_TE_CO_BITS_00:
	      vlib_cli_output (vm, "· CO-bits: 00");
	      break;
	    case SR_TE_CO_BITS_01:
	      vlib_cli_output (vm, "· CO-bits: 01");
	      break;
	    case SR_TE_CO_BITS_10:
	      vlib_cli_output (vm, "· CO-bits: 10");
	      break;
	    case SR_TE_CO_BITS_11:
	      vlib_cli_output (vm, "· CO-bits: 11");
	      break;
	    }
	}
    }
  return 0;
}

VLIB_CLI_COMMAND(show_sr_mpls_steering_policies_command, static)=
{
  .path = "show sr mpls steering policies",
    .short_help = "show sr mpls steering policies",
    .function = show_sr_mpls_steering_policies_command_fn,
};

clib_error_t *
sr_mpls_steering_init (vlib_main_t * vm)
{
  mpls_sr_main_t *sm = &sr_mpls_main;

  /* Init memory for function keys */
  sm->sr_steer_policies_hash.hash = NULL;

  sm->fib_table_EC = (u32) ~ 0;
  sm->ec_labels = 0;

  return 0;
}

VLIB_INIT_FUNCTION(sr_mpls_steering_init);

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