summaryrefslogtreecommitdiffstats
path: root/src/plugins/gbp/gbp_subnet.c
blob: 2ef3fcfd534d0b6fcc9a947b9ff355f8123e9a5f (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
/*
 * Copyright (c) 2018 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.
 */

#include <plugins/gbp/gbp.h>
#include <plugins/gbp/gbp_fwd_dpo.h>
#include <plugins/gbp/gbp_policy_dpo.h>
#include <plugins/gbp/gbp_route_domain.h>

#include <vnet/fib/fib_table.h>
#include <vnet/dpo/load_balance.h>

/**
 * a key for the DB
 */
typedef struct gbp_subnet_key_t_
{
  fib_prefix_t gsk_pfx;
  u32 gsk_fib_index;
} gbp_subnet_key_t;

/**
 * Subnet
 */
typedef struct gbp_subnet_t_
{
  gbp_subnet_key_t *gs_key;
  gbp_subnet_type_t gs_type;
  index_t gs_rd;

  union
  {
    struct
    {
      sclass_t gs_sclass;
      u32 gs_sw_if_index;
    } gs_stitched_external;
    struct
    {
      sclass_t gs_sclass;
    } gs_l3_out;
  };

  fib_node_index_t gs_fei;
} gbp_subnet_t;

/**
 * A DB of the subnets; key={pfx,fib-index}
 */
uword *gbp_subnet_db;

/**
 * pool of subnets
 */
gbp_subnet_t *gbp_subnet_pool;

static fib_source_t gbp_fib_source;

static index_t
gbp_subnet_db_find (u32 fib_index, const fib_prefix_t * pfx)
{
  gbp_subnet_key_t key = {
    .gsk_pfx = *pfx,
    .gsk_fib_index = fib_index,
  };
  uword *p;

  p = hash_get_mem (gbp_subnet_db, &key);

  if (NULL != p)
    return p[0];

  return (INDEX_INVALID);
}

static void
gbp_subnet_db_add (u32 fib_index, const fib_prefix_t * pfx, gbp_subnet_t * gs)
{
  gbp_subnet_key_t *key;

  key = clib_mem_alloc (sizeof (*key));

  clib_memcpy (&(key->gsk_pfx), pfx, sizeof (*pfx));
  key->gsk_fib_index = fib_index;

  hash_set_mem (gbp_subnet_db, key, (gs - gbp_subnet_pool));

  gs->gs_key = key;
}

static void
gbp_subnet_db_del (gbp_subnet_t * gs)
{
  hash_unset_mem (gbp_subnet_db, gs->gs_key);

  clib_mem_free (gs->gs_key);
  gs->gs_key = NULL;
}


static int
gbp_subnet_transport_add (gbp_subnet_t * gs)
{
  dpo_id_t gfd = DPO_INVALID;
  gbp_route_domain_t *grd;
  fib_protocol_t fproto;

  fproto = gs->gs_key->gsk_pfx.fp_proto;
  grd = gbp_route_domain_get (gs->gs_rd);

  if (~0 == grd->grd_uu_sw_if_index[fproto])
    return (VNET_API_ERROR_INVALID_SW_IF_INDEX);

  gs->gs_fei = fib_table_entry_update_one_path (gs->gs_key->gsk_fib_index,
						&gs->gs_key->gsk_pfx,
						gbp_fib_source,
						FIB_ENTRY_FLAG_NONE,
						fib_proto_to_dpo (fproto),
						&ADJ_BCAST_ADDR,
						grd->grd_uu_sw_if_index
						[fproto], ~0, 1, NULL,
						FIB_ROUTE_PATH_FLAG_NONE);

  dpo_reset (&gfd);

  return (0);
}

static int
gbp_subnet_internal_add (gbp_subnet_t * gs)
{
  dpo_id_t gfd = DPO_INVALID;

  gbp_fwd_dpo_add_or_lock (fib_proto_to_dpo (gs->gs_key->gsk_pfx.fp_proto),
			   &gfd);

  gs->gs_fei = fib_table_entry_special_dpo_update (gs->gs_key->gsk_fib_index,
						   &gs->gs_key->gsk_pfx,
						   gbp_fib_source,
						   FIB_ENTRY_FLAG_EXCLUSIVE,
						   &gfd);

  dpo_reset (&gfd);

  return (0);
}

static int
gbp_subnet_external_add (gbp_subnet_t * gs, u32 sw_if_index, sclass_t sclass)
{
  dpo_id_t gpd = DPO_INVALID;

  gs->gs_stitched_external.gs_sclass = sclass;
  gs->gs_stitched_external.gs_sw_if_index = sw_if_index;

  gbp_policy_dpo_add_or_lock (fib_proto_to_dpo (gs->gs_key->gsk_pfx.fp_proto),
			      gbp_route_domain_get_scope (gs->gs_rd),
			      gs->gs_stitched_external.gs_sclass,
			      gs->gs_stitched_external.gs_sw_if_index, &gpd);

  gs->gs_fei = fib_table_entry_special_dpo_update (gs->gs_key->gsk_fib_index,
						   &gs->gs_key->gsk_pfx,
						   gbp_fib_source,
						   (FIB_ENTRY_FLAG_EXCLUSIVE |
						    FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT),
						   &gpd);

  dpo_reset (&gpd);

  return (0);
}

static int
gbp_subnet_l3_out_add (gbp_subnet_t * gs, sclass_t sclass, int is_anon)
{
  fib_entry_flag_t flags;
  dpo_id_t gpd = DPO_INVALID;

  gs->gs_l3_out.gs_sclass = sclass;

  gbp_policy_dpo_add_or_lock (fib_proto_to_dpo (gs->gs_key->gsk_pfx.fp_proto),
			      gbp_route_domain_get_scope (gs->gs_rd),
			      gs->gs_l3_out.gs_sclass, ~0, &gpd);

  flags = FIB_ENTRY_FLAG_INTERPOSE;
  if (is_anon)
    flags |= FIB_ENTRY_FLAG_COVERED_INHERIT;

  gs->gs_fei = fib_table_entry_special_dpo_add (gs->gs_key->gsk_fib_index,
						&gs->gs_key->gsk_pfx,
						FIB_SOURCE_SPECIAL,
						flags, &gpd);

  dpo_reset (&gpd);

  return (0);
}

static void
gbp_subnet_del_i (index_t gsi)
{
  gbp_subnet_t *gs;

  gs = pool_elt_at_index (gbp_subnet_pool, gsi);

  fib_table_entry_delete_index (gs->gs_fei,
				(GBP_SUBNET_L3_OUT == gs->gs_type
				 || GBP_SUBNET_ANON_L3_OUT ==
				 gs->gs_type) ? FIB_SOURCE_SPECIAL :
				gbp_fib_source);

  gbp_subnet_db_del (gs);
  gbp_route_domain_unlock (gs->gs_rd);

  pool_put (gbp_subnet_pool, gs);
}

int
gbp_subnet_del (u32 rd_id, const fib_prefix_t * pfx)
{
  gbp_route_domain_t *grd;
  index_t gsi, grdi;
  u32 fib_index;

  grdi = gbp_route_domain_find (rd_id);

  if (~0 == grdi)
    return (VNET_API_ERROR_NO_SUCH_FIB);

  grd = gbp_route_domain_get (grdi);
  fib_index = grd->grd_fib_index[pfx->fp_proto];

  gsi = gbp_subnet_db_find (fib_index, pfx);

  if (INDEX_INVALID == gsi)
    return (VNET_API_ERROR_NO_SUCH_ENTRY);

  gbp_subnet_del_i (gsi);

  return (0);
}

int
gbp_subnet_add (u32 rd_id,
		const fib_prefix_t * pfx,
		gbp_subnet_type_t type, u32 sw_if_index, sclass_t sclass)
{
  gbp_route_domain_t *grd;
  index_t grdi, gsi;
  gbp_subnet_t *gs;
  u32 fib_index;
  int rv;

  switch (type)
    {
    case GBP_SUBNET_TRANSPORT:
    case GBP_SUBNET_STITCHED_INTERNAL:
    case GBP_SUBNET_STITCHED_EXTERNAL:
    case GBP_SUBNET_L3_OUT:
    case GBP_SUBNET_ANON_L3_OUT:
      break;
    default:
      return (VNET_API_ERROR_INCORRECT_ADJACENCY_TYPE);
    }

  grdi = gbp_route_domain_find_and_lock (rd_id);

  if (~0 == grdi)
    return (VNET_API_ERROR_NO_SUCH_FIB);

  grd = gbp_route_domain_get (grdi);
  fib_index = grd->grd_fib_index[pfx->fp_proto];

  gsi = gbp_subnet_db_find (fib_index, pfx);

  /*
   * this is an update if the subnet already exists, so remove the old
   */
  if (INDEX_INVALID != gsi)
    gbp_subnet_del_i (gsi);

  rv = -2;

  pool_get (gbp_subnet_pool, gs);

  gs->gs_type = type;
  gs->gs_rd = grdi;
  gbp_subnet_db_add (fib_index, pfx, gs);

  switch (type)
    {
    case GBP_SUBNET_STITCHED_INTERNAL:
      rv = gbp_subnet_internal_add (gs);
      break;
    case GBP_SUBNET_STITCHED_EXTERNAL:
      rv = gbp_subnet_external_add (gs, sw_if_index, sclass);
      break;
    case GBP_SUBNET_TRANSPORT:
      rv = gbp_subnet_transport_add (gs);
      break;
    case GBP_SUBNET_L3_OUT:
      rv = gbp_subnet_l3_out_add (gs, sclass, 0 /* is_anon */ );
      break;
    case GBP_SUBNET_ANON_L3_OUT:
      rv = gbp_subnet_l3_out_add (gs, sclass, 1 /* is_anon */ );
      break;
    }

  return (rv);
}

static clib_error_t *
gbp_subnet_add_del_cli (vlib_main_t * vm,
			unformat_input_t * input, vlib_cli_command_t * cmd)
{
  unformat_input_t _line_input, *line_input = &_line_input;
  vnet_main_t *vnm = vnet_get_main ();
  fib_prefix_t pfx = {.fp_addr = ip46_address_initializer };
  int length;
  u32 rd_id = ~0;
  u32 sw_if_index = ~0;
  gbp_subnet_type_t type = ~0;
  u32 sclass = ~0;
  int is_add = 1;
  int rv;

  /* 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, "del"))
	is_add = 0;
      else if (unformat (line_input, "rd %d", &rd_id))
	;
      else
	if (unformat
	    (line_input, "prefix %U/%d", unformat_ip4_address,
	     &pfx.fp_addr.ip4, &length))
	pfx.fp_proto = FIB_PROTOCOL_IP4;
      else
	if (unformat
	    (line_input, "prefix %U/%d", unformat_ip6_address,
	     &pfx.fp_addr.ip6, &length))
	pfx.fp_proto = FIB_PROTOCOL_IP6;
      else if (unformat (line_input, "type transport"))
	type = GBP_SUBNET_TRANSPORT;
      else if (unformat (line_input, "type stitched-internal"))
	type = GBP_SUBNET_STITCHED_INTERNAL;
      else if (unformat (line_input, "type stitched-external"))
	type = GBP_SUBNET_STITCHED_EXTERNAL;
      else if (unformat (line_input, "type anon-l3-out"))
	type = GBP_SUBNET_ANON_L3_OUT;
      else if (unformat (line_input, "type l3-out"))
	type = GBP_SUBNET_L3_OUT;
      else
	if (unformat_user
	    (line_input, unformat_vnet_sw_interface, vnm, &sw_if_index))
	;
      else if (unformat (line_input, "sclass %u", &sclass))
	;
      else
	return clib_error_return (0, "unknown input `%U'",
				  format_unformat_error, line_input);
    }
  unformat_free (line_input);

  pfx.fp_len = length;

  if (is_add)
    rv = gbp_subnet_add (rd_id, &pfx, type, sw_if_index, sclass);
  else
    rv = gbp_subnet_del (rd_id, &pfx);

  switch (rv)
    {
    case 0:
      return 0;
    case VNET_API_ERROR_NO_SUCH_FIB:
      return clib_error_return (0, "no such FIB");
    }

  return clib_error_return (0, "unknown error %d", rv);
}

/*?
 * Add Group Based Policy Subnets
 *
 * @cliexpar
 * @cliexstart{gbp subnet [del] rd <ID> prefix <prefix> type <type> [<interface>] [sclass <sclass>]}
 * @cliexend
 ?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (gbp_subnet_add_del, static) = {
  .path = "gbp subnet",
  .short_help = "gbp subnet [del] rd <ID> prefix <prefix> type <type> [<interface>] [sclass <sclass>]\n",
  .function = gbp_subnet_add_del_cli,
};
/* *INDENT-ON* */



void
gbp_subnet_walk (gbp_subnet_cb_t cb, void *ctx)
{
  gbp_route_domain_t *grd;
  gbp_subnet_t *gs;
  u32 sw_if_index;
  sclass_t sclass;

  sclass = SCLASS_INVALID;
  sw_if_index = ~0;

  /* *INDENT-OFF* */
  pool_foreach (gs, gbp_subnet_pool,
  ({
    grd = gbp_route_domain_get(gs->gs_rd);

    switch (gs->gs_type)
      {
      case GBP_SUBNET_STITCHED_INTERNAL:
      case GBP_SUBNET_TRANSPORT:
        /* use defaults above */
        break;
      case GBP_SUBNET_STITCHED_EXTERNAL:
        sw_if_index = gs->gs_stitched_external.gs_sw_if_index;
        sclass = gs->gs_stitched_external.gs_sclass;
        break;
      case GBP_SUBNET_L3_OUT:
      case GBP_SUBNET_ANON_L3_OUT:
        sclass = gs->gs_l3_out.gs_sclass;
        break;
      }

    if (WALK_STOP == cb (grd->grd_id, &gs->gs_key->gsk_pfx,
                         gs->gs_type, sw_if_index, sclass, ctx))
      break;
  }));
  /* *INDENT-ON* */
}

typedef enum gsb_subnet_show_flags_t_
{
  GBP_SUBNET_SHOW_BRIEF,
  GBP_SUBNET_SHOW_DETAILS,
} gsb_subnet_show_flags_t;

static u8 *
format_gbp_subnet_type (u8 * s, va_list * args)
{
  gbp_subnet_type_t type = va_arg (*args, gbp_subnet_type_t);

  switch (type)
    {
    case GBP_SUBNET_STITCHED_INTERNAL:
      return (format (s, "stitched-internal"));
    case GBP_SUBNET_STITCHED_EXTERNAL:
      return (format (s, "stitched-external"));
    case GBP_SUBNET_TRANSPORT:
      return (format (s, "transport"));
    case GBP_SUBNET_L3_OUT:
      return (format (s, "l3-out"));
    case GBP_SUBNET_ANON_L3_OUT:
      return (format (s, "anon-l3-out"));
    }

  return (format (s, "unknown"));
}

u8 *
format_gbp_subnet (u8 * s, va_list * args)
{
  index_t gsi = va_arg (*args, index_t);
  gsb_subnet_show_flags_t flags = va_arg (*args, gsb_subnet_show_flags_t);
  gbp_subnet_t *gs;
  u32 table_id;

  gs = pool_elt_at_index (gbp_subnet_pool, gsi);

  table_id = fib_table_get_table_id (gs->gs_key->gsk_fib_index,
				     gs->gs_key->gsk_pfx.fp_proto);

  s = format (s, "[%d] tbl:%d %U %U", gsi, table_id,
	      format_fib_prefix, &gs->gs_key->gsk_pfx,
	      format_gbp_subnet_type, gs->gs_type);

  switch (gs->gs_type)
    {
    case GBP_SUBNET_STITCHED_INTERNAL:
    case GBP_SUBNET_TRANSPORT:
      break;
    case GBP_SUBNET_STITCHED_EXTERNAL:
      s = format (s, " {sclass:%d %U}", gs->gs_stitched_external.gs_sclass,
		  format_vnet_sw_if_index_name,
		  vnet_get_main (), gs->gs_stitched_external.gs_sw_if_index);
      break;
    case GBP_SUBNET_L3_OUT:
    case GBP_SUBNET_ANON_L3_OUT:
      s = format (s, " {sclass:%d}", gs->gs_l3_out.gs_sclass);
      break;
    }

  switch (flags)
    {
    case GBP_SUBNET_SHOW_DETAILS:
      {
	s = format (s, "\n  %U", format_fib_entry, gs->gs_fei,
		    FIB_ENTRY_FORMAT_DETAIL);
      }
    case GBP_SUBNET_SHOW_BRIEF:
      break;
    }
  return (s);
}

static clib_error_t *
gbp_subnet_show (vlib_main_t * vm,
		 unformat_input_t * input, vlib_cli_command_t * cmd)
{
  u32 gsi;

  gsi = INDEX_INVALID;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "%d", &gsi))
	;
      else
	break;
    }

  if (INDEX_INVALID != gsi)
    {
      vlib_cli_output (vm, "%U", format_gbp_subnet, gsi,
		       GBP_SUBNET_SHOW_DETAILS);
    }
  else
    {
      /* *INDENT-OFF* */
      pool_foreach_index(gsi, gbp_subnet_pool,
      ({
        vlib_cli_output (vm, "%U", format_gbp_subnet, gsi,
                         GBP_SUBNET_SHOW_BRIEF);
      }));
      /* *INDENT-ON* */
    }

  return (NULL);
}

/*?
 * Show Group Based Policy Subnets
 *
 * @cliexpar
 * @cliexstart{show gbp subnet}
 * @cliexend
 ?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (gbp_subnet_show_node, static) = {
  .path = "show gbp subnet",
  .short_help = "show gbp subnet\n",
  .function = gbp_subnet_show,
};
/* *INDENT-ON* */

static clib_error_t *
gbp_subnet_init (vlib_main_t * vm)
{
  gbp_subnet_db = hash_create_mem (0,
				   sizeof (gbp_subnet_key_t), sizeof (u32));
  gbp_fib_source = fib_source_allocate ("gbp-subnet",
					FIB_SOURCE_PRIORITY_HI,
					FIB_SOURCE_BH_SIMPLE);

  return (NULL);
}

VLIB_INIT_FUNCTION (gbp_subnet_init);

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