aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/flowperpkt-plugin/flowperpkt/flowperpkt.c
blob: fb71d5b0ffcb82282edebe10e8cea4e6bb0b72ef (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
/*
 * flowperpkt.c - per-packet data capture flow report plugin
 *
 * Copyright (c) <current-year> <your-organization>
 * 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 Per-packet IPFIX flow record generator plugin
 *
 * This file implements vpp plugin registration mechanics,
 * debug CLI, and binary API handling.
 */

#include <vnet/vnet.h>
#include <vnet/plugin/plugin.h>
#include <flowperpkt/flowperpkt.h>

#include <vlibapi/api.h>
#include <vlibmemory/api.h>
#include <vlibsocket/api.h>

/* define message IDs */
#include <flowperpkt/flowperpkt_msg_enum.h>

/* define message structures */
#define vl_typedefs
#include <flowperpkt/flowperpkt_all_api_h.h>
#undef vl_typedefs

/* define generated endian-swappers */
#define vl_endianfun
#include <flowperpkt/flowperpkt_all_api_h.h>
#undef vl_endianfun

/* instantiate all the print functions we know about */
#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
#define vl_printfun
#include <flowperpkt/flowperpkt_all_api_h.h>
#undef vl_printfun

flowperpkt_main_t flowperpkt_main;

/* Get the API version number */
#define vl_api_version(n,v) static u32 api_version=(v);
#include <flowperpkt/flowperpkt_all_api_h.h>
#undef vl_api_version

/* Define the per-interface configurable features */
/* *INDENT-OFF* */
VNET_FEATURE_INIT (flow_perpacket_ipv4, static) =
{
  .arc_name = "ip4-output",
  .node_name = "flowperpkt-ipv4",
  .runs_before = VNET_FEATURES ("interface-output"),
};

VNET_FEATURE_INIT (flow_perpacket_l2, static) =
{
  .arc_name = "interface-output",
  .node_name = "flowperpkt-l2",
  .runs_before = VNET_FEATURES ("interface-tx"),
};
/* *INDENT-ON* */

/*
 * A handy macro to set up a message reply.
 * Assumes that the following variables are available:
 * mp - pointer to request message
 * rmp - pointer to reply message type
 * rv - return value
 */
#define REPLY_MACRO(t)                                          \
do {                                                            \
    unix_shared_memory_queue_t * q =                            \
    vl_api_client_index_to_input_queue (mp->client_index);      \
    if (!q)                                                     \
        return;                                                 \
                                                                \
    rmp = vl_msg_api_alloc (sizeof (*rmp));                     \
    rmp->_vl_msg_id = ntohs((t)+fm->msg_id_base);               \
    rmp->context = mp->context;                                 \
    rmp->retval = ntohl(rv);                                    \
                                                                \
    vl_msg_api_send_shmem (q, (u8 *)&rmp);                      \
} while(0);

/* Macro to finish up custom dump fns */
#define FINISH                                  \
    vec_add1 (s, 0);                            \
    vl_print (handle, (char *)s);               \
    vec_free (s);                               \
    return handle;

#define VALIDATE_SW_IF_INDEX(mp)				\
 do { u32 __sw_if_index = ntohl(mp->sw_if_index);		\
    vnet_main_t *__vnm = vnet_get_main();                       \
    if (pool_is_free_index(__vnm->interface_main.sw_interfaces, \
                           __sw_if_index)) {                    \
        rv = VNET_API_ERROR_INVALID_SW_IF_INDEX;                \
        goto bad_sw_if_index;                                   \
    }                                                           \
} while(0);

#define BAD_SW_IF_INDEX_LABEL                   \
do {                                            \
bad_sw_if_index:                                \
    ;                                           \
} while (0);

/**
 * @brief Create an IPFIX template packet rewrite string
 * @param frm flow_report_main_t *
 * @param fr flow_report_t *
 * @param collector_address ip4_address_t * the IPFIX collector address
 * @param src_address ip4_address_t * the source address we should use
 * @param collector_port u16 the collector port we should use, host byte order
 * @returns u8 * vector containing the indicated IPFIX template packet
 */
static inline u8 *
flowperpkt_template_rewrite_inline (flow_report_main_t * frm,
				    flow_report_t * fr,
				    ip4_address_t * collector_address,
				    ip4_address_t * src_address,
				    u16 collector_port, int variant)
{
  ip4_header_t *ip;
  udp_header_t *udp;
  ipfix_message_header_t *h;
  ipfix_set_header_t *s;
  ipfix_template_header_t *t;
  ipfix_field_specifier_t *f;
  ipfix_field_specifier_t *first_field;
  u8 *rewrite = 0;
  ip4_ipfix_template_packet_t *tp;
  u32 field_count = 0;
  flow_report_stream_t *stream;
  flowperpkt_main_t *fm = &flowperpkt_main;

  stream = &frm->streams[fr->stream_index];

  if (variant == FLOW_VARIANT_IPV4)
    {
      /*
       * ip4 Supported Fields:
       *
       * ingressInterface, TLV type 10, u32
       * egressInterface, TLV type 14, u32
       * sourceIpv4Address, TLV type 8, u32
       * destinationIPv4Address, TLV type 12, u32
       * ipClassOfService, TLV type 5, u8
       * flowStartNanoseconds, TLV type 156, dateTimeNanoseconds (f64)
       *   Implementation: f64 nanoseconds since VPP started
       *   warning: wireshark doesn't really understand this TLV
       * dataLinkFrameSize, TLV type 312, u16
       *   warning: wireshark doesn't understand this TLV at all
       */

      /* Currently 7 fields */
      field_count += 7;

      /* allocate rewrite space */
      vec_validate_aligned
	(rewrite,
	 sizeof (ip4_ipfix_template_packet_t)
	 + field_count * sizeof (ipfix_field_specifier_t) - 1,
	 CLIB_CACHE_LINE_BYTES);
    }
  else if (variant == FLOW_VARIANT_L2)
    {
      /*
       * L2 Supported Fields:
       *
       * ingressInterface, TLV type 10, u32
       * egressInterface, TLV type 14, u32
       * sourceMacAddress, TLV type 56, u8[6] we hope
       * destinationMacAddress, TLV type 57, u8[6] we hope
       * ethernetType, TLV type 256, u16
       * flowStartNanoseconds, TLV type 156, dateTimeNanoseconds (f64)
       *   Implementation: f64 nanoseconds since VPP started
       *   warning: wireshark doesn't really understand this TLV
       * dataLinkFrameSize, TLV type 312, u16
       *   warning: wireshark doesn't understand this TLV at all
       */

      /* Currently 7 fields */
      field_count += 7;

      /* allocate rewrite space */
      vec_validate_aligned
	(rewrite,
	 sizeof (ip4_ipfix_template_packet_t)
	 + field_count * sizeof (ipfix_field_specifier_t) - 1,
	 CLIB_CACHE_LINE_BYTES);
    }

  tp = (ip4_ipfix_template_packet_t *) rewrite;
  ip = (ip4_header_t *) & tp->ip4;
  udp = (udp_header_t *) (ip + 1);
  h = (ipfix_message_header_t *) (udp + 1);
  s = (ipfix_set_header_t *) (h + 1);
  t = (ipfix_template_header_t *) (s + 1);
  first_field = f = (ipfix_field_specifier_t *) (t + 1);

  ip->ip_version_and_header_length = 0x45;
  ip->ttl = 254;
  ip->protocol = IP_PROTOCOL_UDP;
  ip->src_address.as_u32 = src_address->as_u32;
  ip->dst_address.as_u32 = collector_address->as_u32;
  udp->src_port = clib_host_to_net_u16 (stream->src_port);
  udp->dst_port = clib_host_to_net_u16 (collector_port);
  udp->length = clib_host_to_net_u16 (vec_len (rewrite) - sizeof (*ip));

  /* FIXUP: message header export_time */
  /* FIXUP: message header sequence_number */
  h->domain_id = clib_host_to_net_u32 (stream->domain_id);

  /* Add TLVs to the template */
  if (variant == FLOW_VARIANT_IPV4)
    {
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , ingressInterface,
			   4);
      f++;
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , egressInterface,
			   4);
      f++;
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , sourceIPv4Address,
			   4);
      f++;
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , destinationIPv4Address, 4);
      f++;
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , ipClassOfService,
			   1);
      f++;
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , flowStartNanoseconds,
			   8);
      f++;
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , dataLinkFrameSize,
			   2);
      f++;
    }
  else if (variant == FLOW_VARIANT_L2)
    {
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , ingressInterface,
			   4);
      f++;
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , egressInterface,
			   4);
      f++;
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , sourceMacAddress,
			   6);
      f++;
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , destinationMacAddress, 6);
      f++;
      f->e_id_length = ipfix_e_id_length (0 /* enterprise */ , ethernetType,
					  2);
      f++;
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , flowStartNanoseconds,
			   8);
      f++;
      f->e_id_length =
	ipfix_e_id_length (0 /* enterprise */ , dataLinkFrameSize,
			   2);
      f++;
    }

  /* Extend in the obvious way, right here... */

  /* Back to the template packet... */
  ip = (ip4_header_t *) & tp->ip4;
  udp = (udp_header_t *) (ip + 1);

  ASSERT (f - first_field);
  /* Field count in this template */
  t->id_count = ipfix_id_count (fr->template_id, f - first_field);

  if (variant == FLOW_VARIANT_IPV4)
    fm->ipv4_report_id = fr->template_id;
  else if (variant == FLOW_VARIANT_L2)
    fm->l2_report_id = fr->template_id;

  /* set length in octets */
  s->set_id_length =
    ipfix_set_id_length (2 /* set_id */ , (u8 *) f - (u8 *) s);

  /* message length in octets */
  h->version_length = version_length ((u8 *) f - (u8 *) h);

  ip->length = clib_host_to_net_u16 ((u8 *) f - (u8 *) ip);
  ip->checksum = ip4_header_checksum (ip);

  return rewrite;
}

u8 *
flowperpkt_template_rewrite_ipv4 (flow_report_main_t * frm,
				  flow_report_t * fr,
				  ip4_address_t * collector_address,
				  ip4_address_t * src_address,
				  u16 collector_port)
{
  return flowperpkt_template_rewrite_inline
    (frm, fr, collector_address, src_address, collector_port,
     FLOW_VARIANT_IPV4);
}

u8 *
flowperpkt_template_rewrite_l2 (flow_report_main_t * frm,
				flow_report_t * fr,
				ip4_address_t * collector_address,
				ip4_address_t * src_address,
				u16 collector_port)
{
  return flowperpkt_template_rewrite_inline
    (frm, fr, collector_address, src_address, collector_port,
     FLOW_VARIANT_L2);
}


/**
 * @brief Flush accumulated data
 * @param frm flow_report_main_t *
 * @param fr flow_report_t *
 * @param f vlib_frame_t *
 *
 * <em>Notes:</em>
 * This function must simply return the incoming frame, or no template packets
 * will be sent.
 */
vlib_frame_t *
flowperpkt_data_callback_ipv4 (flow_report_main_t * frm,
			       flow_report_t * fr,
			       vlib_frame_t * f, u32 * to_next,
			       u32 node_index)
{
  flowperpkt_flush_callback_ipv4 ();
  return f;
}

vlib_frame_t *
flowperpkt_data_callback_l2 (flow_report_main_t * frm,
			     flow_report_t * fr,
			     vlib_frame_t * f, u32 * to_next, u32 node_index)
{
  flowperpkt_flush_callback_l2 ();
  return f;
}

/**
 * @brief configure / deconfigure the IPFIX flow-per-packet
 * @param fm flowperpkt_main_t * fm
 * @param sw_if_index u32 the desired interface
 * @param is_add int 1 to enable the feature, 0 to disable it
 * @returns 0 if successful, non-zero otherwise
 */

static int flowperpkt_tx_interface_add_del_feature
  (flowperpkt_main_t * fm, u32 sw_if_index, int which, int is_add)
{
  flow_report_main_t *frm = &flow_report_main;
  vnet_flow_report_add_del_args_t _a, *a = &_a;
  int rv;

  if (which == FLOW_VARIANT_IPV4 && !fm->ipv4_report_created)
    {
      memset (a, 0, sizeof (*a));
      a->rewrite_callback = flowperpkt_template_rewrite_ipv4;
      a->flow_data_callback = flowperpkt_data_callback_ipv4;
      a->is_add = 1;
      a->domain_id = 1;		/*$$$$ config parameter */
      a->src_port = 4739;	/*$$$$ config parameter */
      fm->ipv4_report_created = 1;

      rv = vnet_flow_report_add_del (frm, a);
      if (rv)
	{
	  clib_warning ("vnet_flow_report_add_del returned %d", rv);
	  return -1;
	}
    }
  else if (which == FLOW_VARIANT_L2 && !fm->l2_report_created)
    {
      memset (a, 0, sizeof (*a));
      a->rewrite_callback = flowperpkt_template_rewrite_l2;
      a->flow_data_callback = flowperpkt_data_callback_l2;
      a->is_add = 1;
      a->domain_id = 1;		/*$$$$ config parameter */
      a->src_port = 4739;	/*$$$$ config parameter */
      fm->l2_report_created = 1;

      rv = vnet_flow_report_add_del (frm, a);
      if (rv)
	{
	  clib_warning ("vnet_flow_report_add_del returned %d", rv);
	  return -1;
	}
    }

  if (which == FLOW_VARIANT_IPV4)
    vnet_feature_enable_disable ("ip4-output", "flowperpkt-ipv4",
				 sw_if_index, is_add, 0, 0);
  else if (which == FLOW_VARIANT_L2)
    vnet_feature_enable_disable ("interface-output", "flowperpkt-l2",
				 sw_if_index, is_add, 0, 0);

  return 0;
}

/**
 * @brief API message handler
 * @param mp vl_api_flowperpkt_tx_interface_add_del_t * mp the api message
 */
void vl_api_flowperpkt_tx_interface_add_del_t_handler
  (vl_api_flowperpkt_tx_interface_add_del_t * mp)
{
  flowperpkt_main_t *fm = &flowperpkt_main;
  vl_api_flowperpkt_tx_interface_add_del_reply_t *rmp;
  u32 sw_if_index = ntohl (mp->sw_if_index);
  int rv = 0;

  VALIDATE_SW_IF_INDEX (mp);

  if (mp->which != FLOW_VARIANT_IPV4 && mp->which != FLOW_VARIANT_L2)
    {
      rv = VNET_API_ERROR_UNIMPLEMENTED;
      goto out;
    }

  rv = flowperpkt_tx_interface_add_del_feature (fm, sw_if_index, mp->which,
						mp->is_add);
out:
  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO (VL_API_FLOWPERPKT_TX_INTERFACE_ADD_DEL_REPLY);
}

/**
 * @brief API message custom-dump function
 * @param mp vl_api_flowperpkt_tx_interface_add_del_t * mp the api message
 * @param handle void * print function handle
 * @returns u8 * output string
 */
static void *vl_api_flowperpkt_tx_interface_add_del_t_print
  (vl_api_flowperpkt_tx_interface_add_del_t * mp, void *handle)
{
  u8 *s;

  s = format (0, "SCRIPT: flowperpkt_tx_interface_add_del ");
  s = format (s, "sw_if_index %d is_add %d which %d ",
	      clib_host_to_net_u32 (mp->sw_if_index),
	      (int) mp->is_add, (int) mp->which);
  FINISH;
}

/* List of message types that this plugin understands */
#define foreach_flowperpkt_plugin_api_msg                           \
_(FLOWPERPKT_TX_INTERFACE_ADD_DEL, flowperpkt_tx_interface_add_del)

/**
 * @brief plugin-api required function
 * @param vm vlib_main_t * vlib main data structure pointer
 * @param h vlib_plugin_handoff_t * handoff structure
 * @param from_early_init int notused
 *
 * <em>Notes:</em>
 * This routine exists to convince the vlib plugin framework that
 * we haven't accidentally copied a random .dll into the plugin directory.
 *
 * Also collects global variable pointers passed from the vpp engine
 */
clib_error_t *
vlib_plugin_register (vlib_main_t * vm, vnet_plugin_handoff_t * h,
		      int from_early_init)
{
  flowperpkt_main_t *fm = &flowperpkt_main;
  clib_error_t *error = 0;

  fm->vlib_main = vm;
  fm->vnet_main = h->vnet_main;

  return error;
}

static clib_error_t *
flowperpkt_tx_interface_add_del_feature_command_fn (vlib_main_t * vm,
						    unformat_input_t * input,
						    vlib_cli_command_t * cmd)
{
  flowperpkt_main_t *fm = &flowperpkt_main;
  u32 sw_if_index = ~0;
  int is_add = 1;
  u8 which = FLOW_VARIANT_IPV4;

  int rv;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "disable"))
	is_add = 0;
      else if (unformat (input, "%U", unformat_vnet_sw_interface,
			 fm->vnet_main, &sw_if_index));
      else if (unformat (input, "l2"))
	which = FLOW_VARIANT_L2;
      else
	break;
    }

  if (sw_if_index == ~0)
    return clib_error_return (0, "Please specify an interface...");

  rv =
    flowperpkt_tx_interface_add_del_feature (fm, sw_if_index, which, is_add);
  switch (rv)
    {
    case 0:
      break;

    case VNET_API_ERROR_INVALID_SW_IF_INDEX:
      return clib_error_return
	(0, "Invalid interface, only works on physical ports");
      break;

    case VNET_API_ERROR_UNIMPLEMENTED:
      return clib_error_return (0, "ip6 not supported");
      break;

    default:
      return clib_error_return (0, "flowperpkt_enable_disable returned %d",
				rv);
    }
  return 0;
}

/*?
 * '<em>flowperpkt feature add-del</em>' commands to enable/disable
 * per-packet IPFIX flow record generation on an interface
 *
 * @cliexpar
 * @parblock
 * To enable per-packet IPFIX flow-record generation on an interface:
 * @cliexcmd{flowperpkt feature add-del GigabitEthernet2/0/0}
 *
 * To disable per-packet IPFIX flow-record generation on an interface:
 * @cliexcmd{flowperpkt feature add-del GigabitEthernet2/0/0 disable}
 * @cliexend
 * @endparblock
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (flowperpkt_enable_disable_command, static) = {
    .path = "flowperpkt feature add-del",
    .short_help =
    "flowperpkt feature add-del <interface-name> [disable]",
    .function = flowperpkt_tx_interface_add_del_feature_command_fn,
};
/* *INDENT-ON* */

/**
 * @brief Set up the API message handling tables
 * @param vm vlib_main_t * vlib main data structure pointer
 * @returns 0 to indicate all is well
 */
static clib_error_t *
flowperpkt_plugin_api_hookup (vlib_main_t * vm)
{
  flowperpkt_main_t *fm = &flowperpkt_main;
#define _(N,n)                                                  \
    vl_msg_api_set_handlers((VL_API_##N + fm->msg_id_base),     \
                           #n,					\
                           vl_api_##n##_t_handler,              \
                           vl_noop_handler,                     \
                           vl_api_##n##_t_endian,               \
                           vl_api_##n##_t_print,                \
                           sizeof(vl_api_##n##_t), 1);
  foreach_flowperpkt_plugin_api_msg;
#undef _

  return 0;
}

#define vl_msg_name_crc_list
#include <flowperpkt/flowperpkt_all_api_h.h>
#undef vl_msg_name_crc_list

static void
setup_message_id_table (flowperpkt_main_t * fm, api_main_t * am)
{
#define _(id,n,crc) \
  vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id + fm->msg_id_base);
  foreach_vl_msg_name_crc_flowperpkt;
#undef _
}

/**
 * @brief Set up the API message handling tables
 * @param vm vlib_main_t * vlib main data structure pointer
 * @returns 0 to indicate all is well, or a clib_error_t
 */
static clib_error_t *
flowperpkt_init (vlib_main_t * vm)
{
  flowperpkt_main_t *fm = &flowperpkt_main;
  vlib_thread_main_t *tm = &vlib_thread_main;
  clib_error_t *error = 0;
  u32 num_threads;
  u8 *name;

  /* Construct the API name */
  name = format (0, "flowperpkt_%08x%c", api_version, 0);

  /* Ask for a correctly-sized block of API message decode slots */
  fm->msg_id_base = vl_msg_api_get_msg_ids
    ((char *) name, VL_MSG_FIRST_AVAILABLE);

  /* Hook up message handlers */
  error = flowperpkt_plugin_api_hookup (vm);

  /* Add our API messages to the global name_crc hash table */
  setup_message_id_table (fm, &api_main);

  vec_free (name);

  /* Decide how many worker threads we have */
  num_threads = 1 /* main thread */  + tm->n_eal_threads;

  /* Allocate per worker thread vectors */
  vec_validate (fm->ipv4_buffers_per_worker, num_threads - 1);
  vec_validate (fm->l2_buffers_per_worker, num_threads - 1);
  vec_validate (fm->ipv4_frames_per_worker, num_threads - 1);
  vec_validate (fm->l2_frames_per_worker, num_threads - 1);
  vec_validate (fm->ipv4_next_record_offset_per_worker, num_threads - 1);
  vec_validate (fm->l2_next_record_offset_per_worker, num_threads - 1);

  /* Set up time reference pair */
  fm->vlib_time_0 = vlib_time_now (vm);
  fm->nanosecond_time_0 = unix_time_now_nsec ();

  return error;
}

VLIB_INIT_FUNCTION (flowperpkt_init);

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