summaryrefslogtreecommitdiffstats
path: root/hicn-plugin/src/mapme_eventmgr.c
blob: 93168d0592b5f66d1f308464208fa6e3824fdba0 (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
/*
 * Copyright (c) 2017-2019 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 "hicn.h"
#include "strategy_dpo_ctx.h"
#include "mapme.h"
#include "mapme_eventmgr.h"
#include "strategies/dpo_mw.h"

#include <vnet/fib/ip4_fib.h>
#include <vnet/fib/ip6_fib.h>

#define DEFAULT_TIMEOUT 1.0	/* s */

hicn_mapme_main_t mapme_main;

hicn_prefix_t *retx_pool;
uword *retx_hash;

void
hicn_mapme_init (vlib_main_t * vm)
{
  mapme_main.vm = vm;
  mapme_main.log_class = vlib_log_register_class ("hicn_mapme", 0);
}

/* borrowed from vnet/fib/ip4_fib.c */

typedef struct ip4_fib_show_walk_ctx_t_
{
  fib_node_index_t *ifsw_indicies;
} ip4_fib_show_walk_ctx_t;

static fib_table_walk_rc_t
ip4_fib_show_walk_cb (fib_node_index_t fib_entry_index, void *arg)
{
  ip4_fib_show_walk_ctx_t *ctx = arg;

  vec_add1 (ctx->ifsw_indicies, fib_entry_index);

  return (FIB_TABLE_WALK_CONTINUE);
}

/* borrowed from vnet/fib/ip6_fib.c */

typedef struct ip6_fib_show_ctx_t_
{
  fib_node_index_t *entries;
} ip6_fib_show_ctx_t;

static fib_table_walk_rc_t
ip6_fib_table_show_walk (fib_node_index_t fib_entry_index, void *arg)
{
  ip6_fib_show_ctx_t *ctx = arg;

  vec_add1 (ctx->entries, fib_entry_index);

  return (FIB_TABLE_WALK_CONTINUE);
}

void
hicn_mapme_process_fib_entry (vlib_main_t * vm, dpo_id_t face,
			      const fib_node_index_t * fib_entry_index)
{
  const dpo_id_t *load_balance_dpo_id;
  load_balance_t *lb;
  dpo_id_t *dpo_id;
  fib_entry_t *fib_entry;

  load_balance_dpo_id = fib_entry_contribute_ip_forwarding (*fib_entry_index);

  /* The dpo is not a load balance dpo as expected */
  if (load_balance_dpo_id->dpoi_type != DPO_LOAD_BALANCE)
    return;

  /* former_dpo_id is a load_balance dpo */
  lb = load_balance_get (load_balance_dpo_id->dpoi_index);

  for (int i = 0; i < lb->lb_n_buckets; i++)
    {
      /* un-const */
      dpo_id = (dpo_id_t *) load_balance_get_bucket_i (lb, i);

      if (dpo_is_hicn (dpo_id))
	{
	  fib_entry = fib_entry_get (*fib_entry_index);
	  vlib_cli_output (vm, "set face pending %U", format_fib_prefix,
			   &fib_entry->fe_prefix);
	}
    }
}

void
hicn_mapme_process_ip4_fib (vlib_main_t * vm, dpo_id_t face)
{
  ip4_main_t *im4 = &ip4_main;
  fib_table_t *fib_table;
  int table_id = -1, fib_index = ~0;

    /* *INDENT-OFF* */
    pool_foreach (fib_table, im4->fibs,
    ({
        ip4_fib_t *fib = pool_elt_at_index(im4->v4_fibs, fib_table->ft_index);

        if (table_id >= 0 && table_id != (int)fib->table_id)
            continue;
        if (fib_index != ~0 && fib_index != (int)fib->index)
            continue;

        fib_node_index_t *fib_entry_index;
        ip4_fib_show_walk_ctx_t ctx = {
            .ifsw_indicies = NULL,
        };

        ip4_fib_table_walk(fib, ip4_fib_show_walk_cb, &ctx);
        //vec_sort_with_function(ctx.ifsw_indicies, fib_entry_cmp_for_sort);

        vec_foreach(fib_entry_index, ctx.ifsw_indicies)
        {
            hicn_mapme_process_fib_entry(vm, face, fib_entry_index);
        }

        vec_free(ctx.ifsw_indicies);
    }));
    /* *INDENT-ON* */
}

void
hicn_mapme_process_ip6_fib (vlib_main_t * vm, dpo_id_t face)
{
  /* Walk IPv6 FIB */
  ip6_main_t *im6 = &ip6_main;
  fib_table_t *fib_table;
  ip6_fib_t *fib;
  int table_id = -1, fib_index = ~0;

    /* *INDENT-OFF* */
    pool_foreach (fib_table, im6->fibs,
    ({
        fib = pool_elt_at_index(im6->v6_fibs, fib_table->ft_index);

        if (table_id >= 0 && table_id != (int)fib->table_id)
            continue;
        if (fib_index != ~0 && fib_index != (int)fib->index)
            continue;
        if (fib_table->ft_flags & FIB_TABLE_FLAG_IP6_LL)
            continue;

        fib_node_index_t *fib_entry_index;
        ip6_fib_show_ctx_t ctx = {
            .entries = NULL,
        };

        ip6_fib_table_walk(fib->index, ip6_fib_table_show_walk, &ctx);
        //vec_sort_with_function(ctx.entries, fib_entry_cmp_for_sort);

        vec_foreach(fib_entry_index, ctx.entries)
        {
            hicn_mapme_process_fib_entry(vm, face, fib_entry_index);
        }

        vec_free(ctx.entries);

    }));
    /* *INDENT-ON* */
}


/**
 * Callback called everytime a new face is created (not including app faces)
 */
void
hicn_mapme_on_face_added (vlib_main_t * vm, dpo_id_t face)
{
  hicn_mapme_process_ip4_fib (vm, face);
  hicn_mapme_process_ip6_fib (vm, face);
}

/*
 * We need a retransmission pool holding all necessary information for crafting
 * special interests, thus including both the DPO and the prefix associated to
 * it.
 */
#define NUM_RETX_ENTRIES 100
#define NUM_RETX_SLOT 2
#define NEXT_SLOT(cur) (1-cur)
#define CUR retx_array[cur]
#define NXT retx_array[NEXT_SLOT(cur)]
#define CURLEN retx_len[cur]
#define NXTLEN retx_len[NEXT_SLOT(cur)]

static_always_inline void *
get_packet_buffer (vlib_main_t * vm, u32 node_index, u32 dpoi_index,
		   ip46_address_t * addr, hicn_type_t type)
{
  vlib_frame_t *f;
  vlib_buffer_t *b;		// for newly created packet
  u32 *to_next;
  u32 bi;
  u8 *buffer;

  if (vlib_buffer_alloc (vm, &bi, 1) != 1)
    {
      clib_warning ("buffer allocation failure");
      return NULL;
    }

  /* Create a new packet from scratch */
  b = vlib_get_buffer (vm, bi);
  ASSERT (b->current_data == 0);

  /* Face information for next hop node index */
  vnet_buffer (b)->ip.adj_index[VLIB_TX] = dpoi_index;
  hicn_get_buffer (b)->type = type;

  /* Enqueue the packet right now */
  f = vlib_get_frame_to_node (vm, node_index);
  to_next = vlib_frame_vector_args (f);
  to_next[0] = bi;
  f->n_vectors = 1;
  vlib_put_frame_to_node (vm, node_index, f);

  // pointer to IP layer ? do we need to prepare for ethernet ???
  buffer = vlib_buffer_get_current (b);
  b->current_length =
    (type.l1 == IPPROTO_IPV6) ? HICN_MAPME_V6_HDRLEN : HICN_MAPME_V4_HDRLEN;

  return buffer;
}

static_always_inline bool
hicn_mapme_send_message (vlib_main_t * vm, const hicn_prefix_t * prefix,
			 mapme_params_t * params, dpo_id_t * face)
{
  size_t n;

  /* This should be retrieved from face information */
  DEBUG ("Retransmission for prefix %U seq=%d", format_ip46_address,
	 &prefix->name, IP46_TYPE_ANY, params->seq);

  char *node_name = hicn_mapme_get_dpo_face_node (face);
  if (!node_name)
    {
      clib_warning
	("Could not determine next node for sending MAP-Me packet");
      return false;
    }

  vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) node_name);
  u32 node_index = node->index;

  u8 *buffer =
    get_packet_buffer (vm, node_index, face->dpoi_index,
		       (ip46_address_t *) prefix,
		       (params->protocol ==
			IPPROTO_IPV6) ? HICN_TYPE_IPV6_ICMP :
		       HICN_TYPE_IPV4_ICMP);
  n = hicn_mapme_create_packet (buffer, prefix, params);
  if (n <= 0)
    {
      clib_warning ("Could not create MAP-Me packet");
      return false;
    }

  return true;
}

static_always_inline void
hicn_mapme_send_updates (vlib_main_t * vm, hicn_prefix_t * prefix,
			 dpo_id_t dpo, bool send_all)
{
  const hicn_dpo_vft_t *dpo_vft = hicn_dpo_get_vft (dpo.dpoi_type);
  hicn_mapme_tfib_t *tfib = TFIB (dpo_vft->hicn_dpo_get_ctx (dpo.dpoi_index));
  u8 tfib_last_idx = HICN_PARAM_FIB_ENTRY_NHOPS_MAX - tfib->tfib_entry_count;
  if (!tfib)
    {
      DEBUG ("NULL TFIB entry id=%d", dpo.dpoi_index);
      return;
    }

  mapme_params_t params = {
    .protocol = ip46_address_is_ip4 (&prefix->name)
      ? IPPROTO_IP : IPPROTO_IPV6,
    .type = UPDATE,
    .seq = tfib->seq,
  };

  if (send_all)
    {
      for (u8 pos = tfib_last_idx; pos < HICN_PARAM_FIB_ENTRY_NHOPS_MAX;
	   pos++)
	{
	  hicn_mapme_send_message (vm, prefix, &params,
				   &tfib->next_hops[pos]);
	}
    }
  else
    {
      hicn_mapme_send_message (vm, prefix, &params,
			       &tfib->next_hops[tfib_last_idx]);
    }
}

static uword
hicn_mapme_eventmgr_process (vlib_main_t * vm,
			     vlib_node_runtime_t * rt, vlib_frame_t * f)
{
  f64 timeout = 0;		/* By default, no timer is run */
  f64 current_time, due_time;
  u8 idle = 0;

  retx_t retx_array[NUM_RETX_SLOT][NUM_RETX_ENTRIES];
  memset(retx_array, 0, NUM_RETX_SLOT*NUM_RETX_ENTRIES);
  u8 retx_len[NUM_RETX_SLOT] = { 0 };
  u8 cur = 0;			/* current slot */

  hicn_mapme_init (vm);

  for (;;)
    {
      /* NOTE: returned timeout seems to always be 0 with get_event_data
       * instead of get_event, and we thus need to reimplement timeout
       * management on top, as done elsewhere in VPP code.
       *
       * The most probable event. For simplicity, for new faces, we pass the same retx_t with no
       * prefix
       */
      if (timeout != 0)
	{
	  /* timeout = */ vlib_process_wait_for_event_or_clock (vm, timeout);
	  current_time = vlib_time_now (vm);

	  /*
	   * As we don't accummulate errors, we allow for simple timer
	   * management with no error correction accounting for elapsed time.
	   * Also, we only run a timer when there are pending retransmissions.
	   */
	  timeout =
	    (due_time >
	     current_time) ? due_time - current_time : DEFAULT_TIMEOUT;
	  due_time = current_time + timeout;
	}
      else
	{
	  vlib_process_wait_for_event (vm);
	}

      uword event_type = ~0;
      void *event_data = vlib_process_get_event_data (vm, &event_type);

      switch (event_type)
	{
	case HICN_MAPME_EVENT_FACE_ADD:
	  {
	    /*
	     * A face has been added:
	     *  - In case of a local app face, we need to advertise a new prefix
	     *  - For another local face type, we need to advertise local
	     *  prefixes and schedule retransmissions
	     */
	    retx_t *retx_events = event_data;
	    for (u8 i = 0; i < vec_len (retx_events); i++)
	      {
		hicn_mapme_on_face_added (vm, retx_events[i].dpo);
	      }
	    idle = 0;
	  }
	  break;

	case HICN_MAPME_EVENT_FACE_DEL:
	  idle = 0;
	  break;

	case HICN_MAPME_EVENT_FACE_NH_SET:
	  {
	    /*
	     * An hICN FIB entry has been modified. All operations so far
	     * have been procedded in the nodes. Here we need to track
	     * retransmissions upon timeout: we mark the FIB entry as pending in
	     * the second-to-next slot
	     */

	    /* Mark FIB entry as pending for second-to-next slot */
	    retx_t *retx_events = event_data;
	    for (u8 i = 0; i < vec_len (retx_events); i++)
	      {
		/*
		 * retx_events[i] corresponds to the dpoi_index of the (T)FIB
		 * structure that has been modified. Multiple successive
		 * events might correspond to the same entry.
		 *
		 * The FIB entry has a new next hop, and its TFIB section has:
		 *  - eventually previous prev hops for which a IU with a
		 *  lower seqno has been sent
		 *  - the prev hops that have just been added.
		 *
		 * We don't distinguish any and just send an updated IU to all
		 * of them. The retransmission of the latest IU to all
		 * facilitates the matching of ACKs to a single seqno which is
		 * the one stored in the FIB.
		 *
		 * Since we retransmit to all prev hops, we can remove this
		 * (T)FIB entry for the check at the end of the current slot.
		 */
		retx_t *retx = (retx_t *) & retx_events[i];

		retx->rtx_count = 0;
		/*
		 * Transmit IU for all TFIB entries with latest seqno (we have
		 * at least one for sure!)
		 */
		hicn_mapme_send_updates (vm, &retx->prefix, retx->dpo, true);

		/* Delete entry_id from retransmissions in the current slot (if present) ... */
		for (u8 j = 0; j < CURLEN; j++)
		  if (!dpo_cmp (&(CUR[j].dpo), &retx->dpo))
		    {
		      CUR[j].dpo.dpoi_index = ~0;	/* sufficient */
		    }

		/* ... and schedule it for next slot (if not already) */
		u8 j;
		for (j = 0; j < NXTLEN; j++)
		  if (!dpo_cmp (&NXT[j].dpo, &retx->dpo))
		    break;
		if (j == NXTLEN)	/* not found */
		  NXT[NXTLEN++] = *retx;
	      }
	    idle = 0;
	  }
	  break;

	case HICN_MAPME_EVENT_FACE_NH_ADD:
	  /*
	   * As per the description of states, this event should add the face
	   * to the list of next hops, and eventually remove it from TFIB.
	   * This corresponds to the multipath case.
	   *
	   * In all cases, we assume the propagation was already done when the first
	   * interest with the same sequence number was received, so we stop here
	   * No change in TFIB = no IU to send
	   *
	   * No change in timers.
	   */
	  vlib_cli_output (vm, "[hicn_event_mgr] ADD NEXT HOP IN FIB");

	  /* Add ingress face as next hop */
	  idle = 0;

	  break;

	case HICN_MAPME_EVENT_FACE_PH_ADD:
	  /* Back-propagation, interesting even for IN (desync) */
	  {
	    retx_t *retx_events = event_data;
	    for (u8 i = 0; i < vec_len (retx_events); i++)
	      {
		hicn_mapme_send_updates (vm, &retx_events[i].prefix,
					 retx_events[i].dpo, false);
	      }
	    idle = 0;
	  }
	  break;

	case HICN_MAPME_EVENT_FACE_PH_DEL:
	  /* Ack : remove an element from TFIB */
	  break;

	case ~0:
	  /* Timeout occurred, we have to retransmit IUs for all pending
	   * prefixes having entries in TFIB
	   *
	   * timeouts are slotted
	   *    |     |     |     |
	   *
	   *      ^
	   *      +- event occurred
	   *            new face, wait for the second next
	   *            (having two arrays and swapping cur and next)
	   *         retx : put in next
	   */
	  idle += 1;
	  for (u8 pos = 0; pos < CURLEN; pos++)
	    {
	      retx_t *retx = &CUR[pos];

	      if (retx->dpo.dpoi_index == ~0)	/* deleted entry */
		continue;

	      const hicn_dpo_vft_t *dpo_vft =
		hicn_dpo_get_vft (retx->dpo.dpoi_type);
	      hicn_mapme_tfib_t *tfib =
		TFIB (dpo_vft->hicn_dpo_get_ctx (retx->dpo.dpoi_index));
	      if (!tfib)
		{
		  DEBUG ("NULL TFIB entry for dpoi_index=%d",
			 retx->dpo.dpoi_index);
		  continue;
		}

	      hicn_mapme_send_updates (vm, &retx->prefix, retx->dpo, true);

	      retx->rtx_count++;
	      // If we exceed the numver of retransmittion it means that all tfib entries have seens at least HICN_PARAM_RTX_MAX of retransmission
	      if (retx->rtx_count < HICN_PARAM_RTX_MAX)
		{
		/*
		 * We did some retransmissions, so let's reschedule a check in the
		 * next slot
		 */
		  NXT[NXTLEN++] = CUR[pos];
		  idle = 0;
		}
	      else
		{
		  hicn_mapme_tfib_clear(tfib);
		}
	    }

	  /* Reset events in this slot and prepare for next one */
	  CURLEN = 0;
	  cur = NEXT_SLOT (cur);

	  /* After two empty slots, we disable the timer */

	  break;
	}

      if (event_data)
	vlib_process_put_event_data (vm, event_data);

      timeout = (idle > 1) ? 0 : DEFAULT_TIMEOUT;

      // if (vlib_process_suspend_time_is_zero (timeout)) { ... }

    }

  /* NOTREACHED */
  return 0;
}

/* Not static as we need to access it from hicn_face */
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (hicn_mapme_eventmgr_process_node) = { //,static) = {
    .function = hicn_mapme_eventmgr_process,
    .type = VLIB_NODE_TYPE_PROCESS,
    .name = "mapme-eventmgr-process",
    .process_log2_n_stack_bytes = 16,
};
/* *INDENT-ON* */

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