summaryrefslogtreecommitdiffstats
path: root/src/vlibmemory/socket_api.c
blob: 26be8d095221bab24c170dcca2a16774842db7d0 (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
/*
 *------------------------------------------------------------------
 * socket_api.c
 *
 * Copyright (c) 2009 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 <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/stat.h>

#include <vppinfra/byte_order.h>
#include <svm/ssvm.h>
#include <vlibmemory/api.h>

#include <vlibmemory/vl_memory_msg_enum.h>

#define vl_typedefs		/* define message structures */
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_typedefs

/* instantiate all the print functions we know about */
#define vl_printfun
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_printfun

/* instantiate all the endian swap functions we know about */
#define vl_endianfun
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_endianfun

#define vl_calcsizefun
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_calcsizefun

socket_main_t socket_main;

#define SOCK_API_REG_HANDLE_BIT (1<<31)

static u32
sock_api_registration_handle (vl_api_registration_t * regp)
{
  ASSERT (regp->vl_api_registration_pool_index < SOCK_API_REG_HANDLE_BIT);
  return regp->vl_api_registration_pool_index | SOCK_API_REG_HANDLE_BIT;
}

static u32
socket_api_registration_handle_to_index (u32 reg_index)
{
  return (reg_index & ~SOCK_API_REG_HANDLE_BIT);
}

u8
vl_socket_api_registration_handle_is_valid (u32 reg_handle)
{
  return ((reg_handle & SOCK_API_REG_HANDLE_BIT) != 0);
}

void
vl_sock_api_dump_clients (vlib_main_t * vm, api_main_t * am)
{
  vl_api_registration_t *reg;
  socket_main_t *sm = &socket_main;
  clib_file_t *f;

  /*
   * Must have at least one active client, not counting the
   * REGISTRATION_TYPE_SOCKET_LISTEN bind/accept socket
   */
  if (pool_elts (sm->registration_pool) < 2)
    return;

  vlib_cli_output (vm, "Socket clients");
  vlib_cli_output (vm, "%20s %8s", "Name", "Fildesc");
    pool_foreach (reg, sm->registration_pool)
     {
        if (reg->registration_type == REGISTRATION_TYPE_SOCKET_SERVER) {
            f = vl_api_registration_file (reg);
            vlib_cli_output (vm, "%20s %8d", reg->name, f->file_descriptor);
        }
    }
}

vl_api_registration_t *
vl_socket_api_client_handle_to_registration (u32 handle)
{
  socket_main_t *sm = &socket_main;
  u32 index = socket_api_registration_handle_to_index (handle);
  if (pool_is_free_index (sm->registration_pool, index))
    {
#if DEBUG > 2
      clib_warning ("Invalid index %d\n", index);
#endif
      return 0;
    }
  return pool_elt_at_index (sm->registration_pool, index);
}

void
vl_socket_api_send (vl_api_registration_t * rp, u8 * elem)
{
#if CLIB_DEBUG > 1
  u32 output_length;
#endif
  socket_main_t *sm = &socket_main;
  u16 msg_id = ntohs (*(u16 *) elem);
  api_main_t *am = vlibapi_get_main ();
  msgbuf_t *mb = (msgbuf_t *) (elem - offsetof (msgbuf_t, data));
  vl_api_registration_t *sock_rp;
  clib_file_main_t *fm = &file_main;
  clib_error_t *error;
  clib_file_t *cf;

  cf = vl_api_registration_file (rp);
  ASSERT (rp->registration_type > REGISTRATION_TYPE_SHMEM);

  if (msg_id >= vec_len (am->msg_data))
    {
      clib_warning ("id out of range: %d", msg_id);
      vl_msg_api_free ((void *) elem);
      return;
    }

  sock_rp = pool_elt_at_index (sm->registration_pool,
			       rp->vl_api_registration_pool_index);
  ASSERT (sock_rp);

  /* Add the msgbuf_t to the output vector */
  vec_add (sock_rp->output_vector, (u8 *) mb, sizeof (*mb));

  /* Try to send the message and save any error like
   * we do in the input epoll loop */
  vec_add (sock_rp->output_vector, elem, ntohl (mb->data_len));
  error = clib_file_write (cf);
  unix_save_error (&unix_main, error);

  /* If we didn't finish sending everything, wait for tx space */
  if (vec_len (sock_rp->output_vector) > 0
      && !(cf->flags & UNIX_FILE_DATA_AVAILABLE_TO_WRITE))
    {
      cf->flags |= UNIX_FILE_DATA_AVAILABLE_TO_WRITE;
      fm->file_update (cf, UNIX_FILE_UPDATE_MODIFY);
    }

#if CLIB_DEBUG > 1
  output_length = sizeof (*mb) + ntohl (mb->data_len);
  clib_warning ("wrote %u bytes to fd %d", output_length,
		cf->file_descriptor);
#endif

  vl_msg_api_free ((void *) elem);
}

void
vl_socket_free_registration_index (u32 pool_index)
{
  int i;
  vl_api_registration_t *rp;
  void vl_api_call_reaper_functions (u32 client_index);

  if (pool_is_free_index (socket_main.registration_pool, pool_index))
    {
      clib_warning ("main pool index %d already free", pool_index);
      return;
    }
  rp = pool_elt_at_index (socket_main.registration_pool, pool_index);

  vl_api_call_reaper_functions (
    clib_host_to_net_u32 (sock_api_registration_handle (rp)));

  ASSERT (rp->registration_type != REGISTRATION_TYPE_FREE);
  for (i = 0; i < vec_len (rp->additional_fds_to_close); i++)
    if (close (rp->additional_fds_to_close[i]) < 0)
      clib_unix_warning ("close");
  vec_free (rp->additional_fds_to_close);
  vec_free (rp->name);
  vec_free (rp->unprocessed_input);
  vec_free (rp->output_vector);
  rp->registration_type = REGISTRATION_TYPE_FREE;
  pool_put (socket_main.registration_pool, rp);
}

void
vl_socket_process_api_msg (vl_api_registration_t * rp, i8 * input_v)
{
  msgbuf_t *mbp = (msgbuf_t *) input_v;

  u8 *the_msg = (u8 *) (mbp->data);
  socket_main.current_rp = rp;
  vl_msg_api_socket_handler (the_msg, ntohl (mbp->data_len));
  socket_main.current_rp = 0;
}

int
is_being_removed_reg_index (u32 reg_index)
{
  vl_api_registration_t *rp = vl_socket_get_registration (reg_index);
  ALWAYS_ASSERT (rp != 0);
  return (rp->is_being_removed);
}

static void
socket_cleanup_pending_remove_registration_cb (u32 *preg_index)
{
  vl_api_registration_t *rp = vl_socket_get_registration (*preg_index);
  if (!rp)
    {
      /* Might already have gone */
      return;
    }

  clib_file_main_t *fm = &file_main;
  u32 pending_remove_file_index = vl_api_registration_file_index (rp);

  clib_file_t *zf = fm->file_pool + pending_remove_file_index;

  clib_file_del (fm, zf);
  vl_socket_free_registration_index (rp - socket_main.registration_pool);
}

static void
vl_socket_request_remove_reg_index (u32 reg_index)
{
  vl_api_registration_t *rp = vl_socket_get_registration (reg_index);
  ALWAYS_ASSERT (rp != 0);
  if (rp->is_being_removed)
    {
      return;
    }
  rp->is_being_removed = 1;
  vl_api_force_rpc_call_main_thread (
    socket_cleanup_pending_remove_registration_cb, (void *) &reg_index,
    sizeof (u32));
}

/*
 * Read function for API socket.
 *
 * Read data from socket, invoke SOCKET_READ_EVENT
 * for each fully read API message, return 0.
 * Store incomplete data for next invocation to continue.
 *
 * On severe read error, the file is closed.
 *
 * As reading is single threaded,
 * socket_main.input_buffer is used temporarily.
 * Even its length is modified, but always restored before return.
 *
 * Incomplete data is copied into a vector,
 * pointer saved in registration's unprocessed_input.
 */
clib_error_t *
vl_socket_read_ready (clib_file_t * uf)
{
  vlib_main_t *vm = vlib_get_main ();
  vl_api_registration_t *rp;
  /* n is the size of data read to input_buffer */
  int n;
  /* msg_buffer vector can point to input_buffer or unprocessed_input */
  i8 *msg_buffer = 0;
  /* data_for_process is a vector containing one full message, incl msgbuf_t */
  u8 *data_for_process;
  /* msgbuf_len is the size of one message, including sizeof (msgbuf_t) */
  u32 msgbuf_len;
  u32 save_input_buffer_length = vec_len (socket_main.input_buffer);
  vl_socket_args_for_process_t *a;
  u32 reg_index = uf->private_data;
  if (is_being_removed_reg_index (reg_index))
    {
      return 0;
    }

  rp = vl_socket_get_registration (reg_index);
  if (!rp)
    {
      return 0;
    }

  /* Ignore unprocessed_input for now, n describes input_buffer for now. */
  n = read (uf->file_descriptor, socket_main.input_buffer,
	    vec_len (socket_main.input_buffer));

  if (n <= 0)
    {
      if (errno != EAGAIN)
	{
	  /* Severe error, close the file. */
	  vl_socket_request_remove_reg_index (reg_index);
	}
      /* EAGAIN means we do not close the file, but no data to process anyway. */
      return 0;
    }

  /* Fake smaller length teporarily, so input_buffer can be used as msg_buffer. */
  vec_set_len (socket_main.input_buffer, n);

  /*
   * Look for bugs here. This code is tricky because
   * data read from a stream socket does not honor message
   * boundaries. In the case of a long message (>4K bytes)
   * we have to do (at least) 2 reads, etc.
   */
  /* Determine msg_buffer. */
  if (vec_len (rp->unprocessed_input))
    {
      vec_append (rp->unprocessed_input, socket_main.input_buffer);
      msg_buffer = rp->unprocessed_input;
    }
  else
    {
      msg_buffer = socket_main.input_buffer;
    }
  /* Loop to process any full messages. */
  ASSERT (vec_len (msg_buffer) > 0);
  do
    {
      /* Here, we are not sure how big a chunk of message we have left. */
      /* Do we at least know how big the full message will be? */
      if (vec_len (msg_buffer) <= sizeof (msgbuf_t))
	/* No, so fragment is not a full message. */
	goto save_and_split;

      /* Now we know how big the full message will be. */
      msgbuf_len =
	ntohl (((msgbuf_t *) msg_buffer)->data_len) + sizeof (msgbuf_t);

      /* But do we have a full message? */
      if (msgbuf_len > vec_len (msg_buffer))
	{
	save_and_split:
	  /* We don't have the entire message yet. */
	  /* If msg_buffer is unprocessed_input, nothing needs to be done. */
	  if (msg_buffer == socket_main.input_buffer)
	    /* But if we were using the input buffer, save the fragment. */
	    {
	      ASSERT (vec_len (rp->unprocessed_input) == 0);
	      vec_validate (rp->unprocessed_input, vec_len (msg_buffer) - 1);
	      clib_memcpy_fast (rp->unprocessed_input, msg_buffer,
				vec_len (msg_buffer));
	      vec_set_len (rp->unprocessed_input, vec_len (msg_buffer));
	    }
	  /* No more full messages, restore original input_buffer length. */
	  vec_set_len (socket_main.input_buffer, save_input_buffer_length);
	  return 0;
	}

      /*
       * We have at least one full message.
       * But msg_buffer can contain more data, so copy one message data
       * so we can overwrite its length to what single message has.
       */
      data_for_process = (u8 *) vec_dup (msg_buffer);
      vec_set_len (data_for_process, msgbuf_len);
      /* Everything is ready to signal the SOCKET_READ_EVENT. */
      pool_get (socket_main.process_args, a);
      a->reg_index = reg_index;
      a->data = data_for_process;

      vlib_process_signal_event (vm, vl_api_clnt_node.index,
				 SOCKET_READ_EVENT,
				 a - socket_main.process_args);
      if (vec_len (msg_buffer) > msgbuf_len)
	/* There are some fragments left. Shrink the msg_buffer to simplify logic. */
	vec_delete (msg_buffer, msgbuf_len, 0);
      else
	/* We are done with msg_buffer. */
	vec_set_len (msg_buffer, 0);
    }
  while (vec_len (msg_buffer) > 0);

  /* Restore input_buffer, it could have been msg_buffer. */
  vec_set_len (socket_main.input_buffer, save_input_buffer_length);
  return 0;
}

clib_error_t *
vl_socket_write_ready (clib_file_t * uf)
{
  clib_file_main_t *fm = &file_main;
  vl_api_registration_t *rp;
  int n;

  u32 reg_index = uf->private_data;
  if (is_being_removed_reg_index (reg_index))
    {
      return 0;
    }

  rp = pool_elt_at_index (socket_main.registration_pool, reg_index);

  /* Flush output vector. */
  size_t total_bytes = vec_len (rp->output_vector);
  size_t bytes_to_send, remaining_bytes = total_bytes;
  void *p = rp->output_vector;
  while (remaining_bytes > 0)
    {
      bytes_to_send = remaining_bytes > 4096 ? 4096 : remaining_bytes;
      n = send (uf->file_descriptor, p, bytes_to_send, MSG_NOSIGNAL);
      if (n < 0)
	{
	  if (errno == EAGAIN)
	    {
	      break;
	    }
#if DEBUG > 2
	  clib_warning ("write error, close the file...\n");
#endif
	  vl_socket_request_remove_reg_index (reg_index);
	  return 0;
	}
      remaining_bytes -= bytes_to_send;
      p += bytes_to_send;
    }

  vec_delete (rp->output_vector, total_bytes - remaining_bytes, 0);
  if (vec_len (rp->output_vector) <= 0
      && (uf->flags & UNIX_FILE_DATA_AVAILABLE_TO_WRITE))
    {
      uf->flags &= ~UNIX_FILE_DATA_AVAILABLE_TO_WRITE;
      fm->file_update (uf, UNIX_FILE_UPDATE_MODIFY);
    }

  return 0;
}

clib_error_t *
vl_socket_error_ready (clib_file_t * uf)
{
  u32 reg_index = uf->private_data;
  vl_socket_request_remove_reg_index (reg_index);
  return 0;
}

void
socksvr_file_add (clib_file_main_t * fm, int fd)
{
  vl_api_registration_t *rp;
  clib_file_t template = { 0 };

  pool_get (socket_main.registration_pool, rp);
  clib_memset (rp, 0, sizeof (*rp));

  template.read_function = vl_socket_read_ready;
  template.write_function = vl_socket_write_ready;
  template.error_function = vl_socket_error_ready;
  template.file_descriptor = fd;
  template.description = format (0, "socksrv");
  template.private_data = rp - socket_main.registration_pool;

  rp->registration_type = REGISTRATION_TYPE_SOCKET_SERVER;
  rp->vl_api_registration_pool_index = rp - socket_main.registration_pool;
  rp->clib_file_index = clib_file_add (fm, &template);
}

static clib_error_t *
socksvr_accept_ready (clib_file_t * uf)
{
  clib_file_main_t *fm = &file_main;
  socket_main_t *sm = &socket_main;
  clib_socket_t *sock = &sm->socksvr_listen_socket;
  clib_socket_t client;
  clib_error_t *error;

  error = clib_socket_accept (sock, &client);
  if (error)
    return error;

  socksvr_file_add (fm, client.fd);
  return 0;
}

static clib_error_t *
socksvr_bogus_write (clib_file_t * uf)
{
  clib_warning ("why am I here?");
  return 0;
}

/*
 * vl_api_sockclnt_create_t_handler
 */
void
vl_api_sockclnt_create_t_handler (vl_api_sockclnt_create_t * mp)
{
  vl_api_registration_t *regp;
  vl_api_sockclnt_create_reply_t *rp;
  api_main_t *am = vlibapi_get_main ();
  hash_pair_t *hp;
  int rv = 0;
  u32 nmsg = hash_elts (am->msg_index_by_name_and_crc);
  u32 i = 0;

  regp = socket_main.current_rp;

  /* client already connected through shared memory? */
  if (!regp || regp->registration_type != REGISTRATION_TYPE_SOCKET_SERVER)
    {
      clib_warning (
	"unsupported API call: already connected though shared memory?");
      return;
    }

  regp->name = format (0, "%s%c", mp->name, 0);

  u32 size = sizeof (*rp) + (nmsg * sizeof (vl_api_message_table_entry_t));
  rp = vl_msg_api_alloc_zero (size);
  rp->_vl_msg_id = htons (VL_API_SOCKCLNT_CREATE_REPLY);
  rp->index = htonl (sock_api_registration_handle (regp));
  rp->context = mp->context;
  rp->response = htonl (rv);
  rp->count = htons (nmsg);

  hash_foreach_pair (hp, am->msg_index_by_name_and_crc,
  ({
    rp->message_table[i].index = htons(hp->value[0]);
    (void) strncpy_s((char *)rp->message_table[i].name,
                     64 /* bytes of space at dst */,
                     (char *)hp->key,
                     64-1 /* chars to copy, without zero byte. */);
    i++;
  }));
  vl_api_send_msg (regp, (u8 *) rp);
}

/*
 * vl_api_sockclnt_delete_t_handler
 */
void
vl_api_sockclnt_delete_t_handler (vl_api_sockclnt_delete_t * mp)
{
  vl_api_registration_t *regp;
  vl_api_sockclnt_delete_reply_t *rp;

  regp = vl_api_client_index_to_registration (mp->client_index);
  if (!regp)
    return;

  u32 reg_index = socket_api_registration_handle_to_index (ntohl (mp->index));
  rp = vl_msg_api_alloc (sizeof (*rp));
  rp->_vl_msg_id = htons (VL_API_SOCKCLNT_DELETE_REPLY);
  rp->context = mp->context;

  if (!pool_is_free_index (socket_main.registration_pool, reg_index))
    {
      rp->response = htonl (1);
      vl_api_send_msg (regp, (u8 *) rp);

      vl_api_registration_del_file (regp);
      vl_socket_free_registration_index (reg_index);
    }
  else
    {
      clib_warning ("unknown client ID %d", reg_index);
      rp->response = htonl (-1);
      vl_api_send_msg (regp, (u8 *) rp);
    }
}

clib_error_t *
vl_sock_api_send_fd_msg (int socket_fd, int fds[], int n_fds)
{
  struct msghdr mh = { 0 };
  struct iovec iov[1];
  char ctl[CMSG_SPACE (sizeof (int) * n_fds)];
  struct cmsghdr *cmsg;
  char *msg = "fdmsg";
  int rv;

  iov[0].iov_base = msg;
  iov[0].iov_len = strlen (msg);
  mh.msg_iov = iov;
  mh.msg_iovlen = 1;

  clib_memset (&ctl, 0, sizeof (ctl));
  mh.msg_control = ctl;
  mh.msg_controllen = sizeof (ctl);
  cmsg = CMSG_FIRSTHDR (&mh);
  cmsg->cmsg_len = CMSG_LEN (sizeof (int) * n_fds);
  cmsg->cmsg_level = SOL_SOCKET;
  cmsg->cmsg_type = SCM_RIGHTS;
  clib_memcpy_fast (CMSG_DATA (cmsg), fds, sizeof (int) * n_fds);

  while ((rv = sendmsg (socket_fd, &mh, 0)) < 0 && errno == EAGAIN)
    ;
  if (rv < 0)
    return clib_error_return_unix (0, "sendmsg");
  return 0;
}

vl_api_shm_elem_config_t *
vl_api_make_shm_config (vl_api_sock_init_shm_t * mp)
{
  vl_api_shm_elem_config_t *config = 0, *c;
  u64 cfg;
  int i;

  if (!mp->nitems)
    {
      vec_validate (config, 6);
      config[0].type = VL_API_VLIB_RING;
      config[0].size = 256;
      config[0].count = 32;

      config[1].type = VL_API_VLIB_RING;
      config[1].size = 1024;
      config[1].count = 16;

      config[2].type = VL_API_VLIB_RING;
      config[2].size = 4096;
      config[2].count = 2;

      config[3].type = VL_API_CLIENT_RING;
      config[3].size = 256;
      config[3].count = 32;

      config[4].type = VL_API_CLIENT_RING;
      config[4].size = 1024;
      config[4].count = 16;

      config[5].type = VL_API_CLIENT_RING;
      config[5].size = 4096;
      config[5].count = 2;

      config[6].type = VL_API_QUEUE;
      config[6].count = 128;
      config[6].size = sizeof (uword);
    }
  else
    {
      vec_validate (config, mp->nitems - 1);
      for (i = 0; i < mp->nitems; i++)
	{
	  cfg = mp->configs[i];
	  /* Pretty much a hack but it avoids defining our own api type
	   * in memclnt.api */
	  c = (vl_api_shm_elem_config_t *) & cfg;
	  config[i].type = c->type;
	  config[i].count = c->count;
	  config[i].size = c->size;
	}
    }
  return config;
}

/*
 * Bootstrap shm api using the socket api
 */
void
vl_api_sock_init_shm_t_handler (vl_api_sock_init_shm_t * mp)
{
  vl_api_sock_init_shm_reply_t *rmp;
  ssvm_private_t _memfd_private, *memfd = &_memfd_private;
  svm_map_region_args_t _args, *a = &_args;
  vl_api_registration_t *regp;
  api_main_t *am = vlibapi_get_main ();
  svm_region_t *vlib_rp;
  clib_file_t *cf;
  vl_api_shm_elem_config_t *config = 0;
  vl_shmem_hdr_t *shmem_hdr;
  int rv, tries = 1000;

  regp = vl_api_client_index_to_registration (mp->client_index);
  if (regp == 0)
    {
      clib_warning ("API client disconnected");
      return;
    }
  if (regp->registration_type != REGISTRATION_TYPE_SOCKET_SERVER)
    {
      clib_warning ("Invalid registration");
      return;
    }

  /*
   * Set up a memfd segment of the requested size wherein the
   * shmem data structures will be initialized
   */
  clib_memset (memfd, 0, sizeof (*memfd));
  memfd->ssvm_size = mp->requested_size;
  memfd->requested_va = 0ULL;
  memfd->is_server = 1;
  memfd->name = format (0, "%s%c", regp->name, 0);

  if ((rv = ssvm_server_init_memfd (memfd)))
    goto reply;

  /* delete the unused heap created in ssvm_server_init_memfd and mark it
   * accessible again for ASAN */
  clib_mem_destroy_heap (memfd->sh->heap);
  clib_mem_unpoison ((void *) memfd->sh->ssvm_va, memfd->ssvm_size);

  /* Remember to close this fd when the socket connection goes away */
  vec_add1 (regp->additional_fds_to_close, memfd->fd);

  /*
   * Create a plausible svm_region in the memfd backed segment
   */
  clib_memset (a, 0, sizeof (*a));
  a->baseva = memfd->sh->ssvm_va + MMAP_PAGESIZE;
  a->size = memfd->ssvm_size - MMAP_PAGESIZE;
  /* $$$$ might want a different config parameter */
  a->pvt_heap_size = am->api_pvt_heap_size;
  a->flags = SVM_FLAGS_MHEAP;
  svm_region_init_mapped_region (a, (svm_region_t *) a->baseva);

  /*
   * Part deux, initialize the svm_region_t shared-memory header
   * api allocation rings, and so on.
   */
  config = vl_api_make_shm_config (mp);
  vlib_rp = (svm_region_t *) a->baseva;
  vl_init_shmem (vlib_rp, config, 1 /* is_vlib (dont-care) */ ,
		 1 /* is_private */ );

  /* Remember who created this. Needs to be post vl_init_shmem */
  shmem_hdr = (vl_shmem_hdr_t *) vlib_rp->user_ctx;
  shmem_hdr->clib_file_index = vl_api_registration_file_index (regp);

  vec_add1 (am->vlib_private_rps, vlib_rp);
  memfd->sh->ready = 1;
  vec_free (config);

  /* Recompute the set of input queues to poll in memclnt_process */
  vec_reset_length (vl_api_queue_cursizes);

reply:

  rmp = vl_msg_api_alloc (sizeof (*rmp));
  rmp->_vl_msg_id = htons (VL_API_SOCK_INIT_SHM_REPLY);
  rmp->context = mp->context;
  rmp->retval = htonl (rv);

  /*
   * Note: The reply message needs to make it out the back door
   * before we send the magic fd message. That's taken care of by
   * the send function.
   */
  vl_socket_api_send (regp, (u8 *) rmp);

  if (rv != 0)
    return;

  /* Send the magic "here's your sign (aka fd)" socket message */
  cf = vl_api_registration_file (regp);
  if (!cf)
    {
      clib_warning ("cf removed");
      return;
    }

  /* Wait for reply to be consumed before sending the fd */
  while (tries-- > 0)
    {
      int bytes;
      rv = ioctl (cf->file_descriptor, TIOCOUTQ, &bytes);
      if (rv < 0)
	{
	  clib_unix_warning ("ioctl returned");
	  break;
	}
      if (bytes == 0)
	break;
      usleep (1e3);
    }

  vl_sock_api_send_fd_msg (cf->file_descriptor, &memfd->fd, 1);
}

#define foreach_vlib_api_msg                                                  \
  _ (SOCKCLNT_CREATE, sockclnt_create, 0)                                     \
  _ (SOCKCLNT_DELETE, sockclnt_delete, 0)                                     \
  _ (SOCK_INIT_SHM, sock_init_shm, 0)

clib_error_t *
vl_sock_api_init (vlib_main_t * vm)
{
  api_main_t *am = vlibapi_get_main ();
  clib_file_main_t *fm = &file_main;
  clib_file_t template = { 0 };
  vl_api_registration_t *rp;
  socket_main_t *sm = &socket_main;
  clib_socket_t *sock = &sm->socksvr_listen_socket;
  clib_error_t *error;

  /* If not explicitly configured, do not bind/enable, etc. */
  if (sm->socket_name == 0)
    return 0;

#define _(N, n, t)                                                            \
  vl_msg_api_config (&(vl_msg_api_msg_config_t){                              \
    .id = VL_API_##N,                                                         \
    .name = #n,                                                               \
    .handler = vl_api_##n##_t_handler,                                        \
    .endian = vl_api_##n##_t_endian,                                          \
    .format_fn = vl_api_##n##_t_format,                                       \
    .size = sizeof (vl_api_##n##_t),                                          \
    .traced = t,                                                              \
    .tojson = vl_api_##n##_t_tojson,                                          \
    .fromjson = vl_api_##n##_t_fromjson,                                      \
    .calc_size = vl_api_##n##_t_calc_size,                                    \
  });                                                                         \
  am->msg_data[VL_API_##N].replay_allowed = 0;
  foreach_vlib_api_msg;
#undef _

  vec_resize (sm->input_buffer, 4096);

  sock->config = (char *) sm->socket_name;
  sock->flags = CLIB_SOCKET_F_IS_SERVER | CLIB_SOCKET_F_ALLOW_GROUP_WRITE;
  error = clib_socket_init (sock);
  if (error)
    return error;

  pool_get (sm->registration_pool, rp);
  clib_memset (rp, 0, sizeof (*rp));

  rp->registration_type = REGISTRATION_TYPE_SOCKET_LISTEN;

  template.read_function = socksvr_accept_ready;
  template.write_function = socksvr_bogus_write;
  template.file_descriptor = sock->fd;
  template.description = format (0, "socksvr %s", sock->config);
  template.private_data = rp - sm->registration_pool;

  rp->clib_file_index = clib_file_add (fm, &template);
  return 0;
}

static clib_error_t *
socket_exit (vlib_main_t * vm)
{
  socket_main_t *sm = &socket_main;
  vl_api_registration_t *rp;

  /* Defensive driving in case something wipes out early */
  if (sm->registration_pool)
    {
      u32 index;
        pool_foreach (rp, sm->registration_pool)  {
          vl_api_registration_del_file (rp);
          index = rp->vl_api_registration_pool_index;
          vl_socket_free_registration_index (index);
        }
    }

  return 0;
}

VLIB_MAIN_LOOP_EXIT_FUNCTION (socket_exit);

static clib_error_t *
socksvr_config (vlib_main_t * vm, unformat_input_t * input)
{
  socket_main_t *sm = &socket_main;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "socket-name %s", &sm->socket_name))
	;
      /* DEPRECATE: default keyword is ignored */
      else if (unformat (input, "default"))
	;
      else
	{
	  return clib_error_return (0, "unknown input '%U'",
				    format_unformat_error, input);
	}
    }

  if (!vec_len (sm->socket_name))
    sm->socket_name = format (0, "%s/%s", vlib_unix_get_runtime_dir (),
			      API_SOCKET_FILENAME);
  vec_terminate_c_string (sm->socket_name);

  return 0;
}

VLIB_CONFIG_FUNCTION (socksvr_config, "socksvr");

void
vlibsocket_reference ()
{
}

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