aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/udp/udp.c
blob: e194b9cc6430a67cf1007379406ff57f88ef9454 (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
/*
 * Copyright (c) 2016-2020 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 <vnet/udp/udp.h>
#include <vnet/session/session.h>
#include <vnet/dpo/load_balance.h>
#include <vnet/ip/ip4_inlines.h>
#include <vnet/ip/ip6_inlines.h>
#include <vppinfra/sparse_vec.h>

udp_main_t udp_main;

static void
udp_connection_register_port (u16 lcl_port, u8 is_ip4)
{
  udp_main_t *um = &udp_main;
  u16 *n;

  /* Setup udp protocol -> next index sparse vector mapping. Do not setup
   * udp_dst_port_info_t as that is used to distinguish between external
   * and transport consumed ports */

  if (is_ip4)
    n = sparse_vec_validate (um->next_by_dst_port4, lcl_port);
  else
    n = sparse_vec_validate (um->next_by_dst_port6, lcl_port);

  n[0] = um->local_to_input_edge[is_ip4];

  __atomic_add_fetch (&um->transport_ports_refcnt[is_ip4][lcl_port], 1,
		      __ATOMIC_RELAXED);
}

static void
udp_connection_unregister_port (u16 lcl_port, u8 is_ip4)
{
  udp_main_t *um = &udp_main;
  u16 *n;

  /* Needed because listeners are not tracked as local endpoints */
  if (__atomic_sub_fetch (&um->transport_ports_refcnt[is_ip4][lcl_port], 1,
			  __ATOMIC_RELAXED))
    return;

  if (is_ip4)
    n = sparse_vec_validate (um->next_by_dst_port4, lcl_port);
  else
    n = sparse_vec_validate (um->next_by_dst_port6, lcl_port);

  n[0] = UDP_NO_NODE_SET;
}

udp_connection_t *
udp_connection_alloc (u32 thread_index)
{
  udp_worker_t *wrk = udp_worker_get (thread_index);
  udp_connection_t *uc;

  pool_get_aligned_safe (wrk->connections, uc, CLIB_CACHE_LINE_BYTES);

  clib_memset (uc, 0, sizeof (*uc));
  uc->c_c_index = uc - wrk->connections;
  uc->c_thread_index = thread_index;
  uc->c_proto = TRANSPORT_PROTO_UDP;
  return uc;
}

void
udp_connection_free (udp_connection_t * uc)
{
  udp_worker_t *wrk = udp_worker_get (uc->c_thread_index);

  clib_spinlock_free (&uc->rx_lock);
  if (CLIB_DEBUG)
    clib_memset (uc, 0xFA, sizeof (*uc));
  pool_put (wrk->connections, uc);
}

static void
udp_connection_cleanup (udp_connection_t * uc)
{
  transport_release_local_endpoint (TRANSPORT_PROTO_UDP, &uc->c_lcl_ip,
				    uc->c_lcl_port);
  udp_connection_unregister_port (uc->c_lcl_port, uc->c_is_ip4);
  udp_connection_free (uc);
}

void
udp_connection_delete (udp_connection_t * uc)
{
  session_transport_delete_notify (&uc->connection);
  udp_connection_cleanup (uc);
}

static void
udp_handle_cleanups (void *args)
{
  u32 thread_index = (u32) pointer_to_uword (args);
  udp_connection_t *uc;
  udp_worker_t *wrk;
  u32 *uc_index;

  wrk = udp_worker_get (thread_index);
  vec_foreach (uc_index, wrk->pending_cleanups)
    {
      uc = udp_connection_get (*uc_index, thread_index);
      udp_connection_delete (uc);
    }
  vec_reset_length (wrk->pending_cleanups);
}

static void
udp_connection_program_cleanup (udp_connection_t *uc)
{
  uword thread_index = uc->c_thread_index;
  udp_worker_t *wrk;

  wrk = udp_worker_get (uc->c_thread_index);
  vec_add1 (wrk->pending_cleanups, uc->c_c_index);

  if (vec_len (wrk->pending_cleanups) == 1)
    session_send_rpc_evt_to_thread_force (
      thread_index, udp_handle_cleanups,
      uword_to_pointer (thread_index, void *));
}

static u8
udp_connection_port_used_extern (u16 lcl_port, u8 is_ip4)
{
  udp_main_t *um = vnet_get_udp_main ();
  udp_dst_port_info_t *pi;

  pi = udp_get_dst_port_info (um, lcl_port, is_ip4);
  return (pi && udp_is_valid_dst_port (lcl_port, is_ip4));
}

static u16
udp_default_mtu (udp_main_t * um, u8 is_ip4)
{
  u16 ip_hlen = is_ip4 ? sizeof (ip4_header_t) : sizeof (ip6_header_t);
  return (um->default_mtu - sizeof (udp_header_t) - ip_hlen);
}

static u32
udp_session_bind (u32 session_index, transport_endpoint_cfg_t *lcl)
{
  udp_main_t *um = vnet_get_udp_main ();
  transport_endpoint_cfg_t *lcl_ext;
  udp_connection_t *listener;
  void *iface_ip;

  if (udp_connection_port_used_extern (clib_net_to_host_u16 (lcl->port),
				       lcl->is_ip4))
    {
      clib_warning ("port already used");
      return SESSION_E_PORTINUSE;
    }

  pool_get (um->listener_pool, listener);
  clib_memset (listener, 0, sizeof (udp_connection_t));

  listener->c_lcl_port = lcl->port;
  listener->c_c_index = listener - um->listener_pool;

  /* If we are provided a sw_if_index, bind using one of its ips */
  if (ip_is_zero (&lcl->ip, 1) && lcl->sw_if_index != ENDPOINT_INVALID_INDEX)
    {
      if ((iface_ip = ip_interface_get_first_ip (lcl->sw_if_index,
						 lcl->is_ip4)))
	ip_set (&lcl->ip, iface_ip, lcl->is_ip4);
    }
  ip_copy (&listener->c_lcl_ip, &lcl->ip, lcl->is_ip4);
  listener->c_is_ip4 = lcl->is_ip4;
  listener->c_proto = TRANSPORT_PROTO_UDP;
  listener->c_s_index = session_index;
  listener->c_fib_index = lcl->fib_index;
  listener->mss =
    lcl->mss ? lcl->mss : udp_default_mtu (um, listener->c_is_ip4);
  listener->flags |= UDP_CONN_F_OWNS_PORT | UDP_CONN_F_LISTEN;
  lcl_ext = (transport_endpoint_cfg_t *) lcl;
  if (lcl_ext->transport_flags & TRANSPORT_CFG_F_CONNECTED)
    listener->flags |= UDP_CONN_F_CONNECTED;
  else
    listener->c_flags |= TRANSPORT_CONNECTION_F_CLESS;
  clib_spinlock_init (&listener->rx_lock);
  if (!um->csum_offload)
    listener->cfg_flags |= UDP_CFG_F_NO_CSUM_OFFLOAD;

  udp_connection_register_port (listener->c_lcl_port, lcl->is_ip4);
  return listener->c_c_index;
}

static u32
udp_session_unbind (u32 listener_index)
{
  udp_main_t *um = &udp_main;
  udp_connection_t *listener;

  listener = udp_listener_get (listener_index);
  udp_connection_unregister_port (listener->c_lcl_port, listener->c_is_ip4);
  clib_spinlock_free (&listener->rx_lock);
  pool_put (um->listener_pool, listener);
  return 0;
}

static transport_connection_t *
udp_session_get_listener (u32 listener_index)
{
  udp_connection_t *us;

  us = udp_listener_get (listener_index);
  return &us->connection;
}

always_inline u32
udp_push_one_header (vlib_main_t *vm, udp_connection_t *uc, vlib_buffer_t *b,
		     u8 is_cless)
{
  b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
  /* reuse tcp medatada for now */
  vnet_buffer (b)->tcp.connection_index = uc->c_c_index;

  if (!is_cless)
    {
      vlib_buffer_push_udp (b, uc->c_lcl_port, uc->c_rmt_port,
			    udp_csum_offload (uc));

      if (uc->c_is_ip4)
	vlib_buffer_push_ip4_custom (vm, b, &uc->c_lcl_ip4, &uc->c_rmt_ip4,
				     IP_PROTOCOL_UDP, udp_csum_offload (uc),
				     0 /* is_df */, uc->c_dscp);
      else
	vlib_buffer_push_ip6 (vm, b, &uc->c_lcl_ip6, &uc->c_rmt_ip6,
			      IP_PROTOCOL_UDP);

      vnet_buffer (b)->tcp.flags = 0;
    }
  else
    {
      u8 *data = vlib_buffer_get_current (b);
      session_dgram_hdr_t hdr;

      hdr = *(session_dgram_hdr_t *) (data - sizeof (hdr));

      /* Local port assumed to be bound, not overwriting it */
      vlib_buffer_push_udp (b, uc->c_lcl_port, hdr.rmt_port,
			    udp_csum_offload (uc));

      if (uc->c_is_ip4)
	vlib_buffer_push_ip4_custom (vm, b, &hdr.lcl_ip.ip4, &hdr.rmt_ip.ip4,
				     IP_PROTOCOL_UDP, udp_csum_offload (uc),
				     0 /* is_df */, uc->c_dscp);
      else
	vlib_buffer_push_ip6 (vm, b, &hdr.lcl_ip.ip6, &hdr.rmt_ip.ip6,
			      IP_PROTOCOL_UDP);

      /* Not connected udp session. Mark buffer for custom handling in
       * udp_output */
      vnet_buffer (b)->tcp.flags |= UDP_CONN_F_LISTEN;
    }

  return 0;
}

always_inline void
udp_push_header_batch (udp_connection_t *uc, vlib_buffer_t **bs, u32 n_bufs,
		       u8 is_cless)
{
  vlib_main_t *vm = vlib_get_main ();

  while (n_bufs >= 4)
    {
      vlib_prefetch_buffer_header (bs[2], STORE);
      vlib_prefetch_buffer_header (bs[3], STORE);

      udp_push_one_header (vm, uc, bs[0], is_cless);
      udp_push_one_header (vm, uc, bs[1], is_cless);

      n_bufs -= 2;
      bs += 2;
    }
  while (n_bufs)
    {
      if (n_bufs > 1)
	vlib_prefetch_buffer_header (bs[1], STORE);

      udp_push_one_header (vm, uc, bs[0], is_cless);

      n_bufs -= 1;
      bs += 1;
    }
}

static u32
udp_push_header (transport_connection_t *tc, vlib_buffer_t **bs, u32 n_bufs)
{
  udp_connection_t *uc;

  uc = udp_connection_from_transport (tc);
  if (uc->flags & UDP_CONN_F_CONNECTED)
    udp_push_header_batch (uc, bs, n_bufs, 0 /* is_cless */);
  else
    udp_push_header_batch (uc, bs, n_bufs, 1 /* is_cless */);

  if (PREDICT_FALSE (uc->flags & UDP_CONN_F_CLOSING))
    {
      if (!transport_tx_fifo_has_dgram (&uc->connection))
	udp_connection_program_cleanup (uc);
    }

  return 0;
}

static transport_connection_t *
udp_session_get (u32 connection_index, u32 thread_index)
{
  udp_connection_t *uc;
  uc = udp_connection_get (connection_index, thread_index);
  if (uc)
    return &uc->connection;
  return 0;
}

static void
udp_session_close (u32 connection_index, u32 thread_index)
{
  udp_connection_t *uc;

  uc = udp_connection_get (connection_index, thread_index);
  if (!uc || (uc->flags & UDP_CONN_F_MIGRATED))
    return;

  if (!transport_tx_fifo_has_dgram (&uc->connection))
    udp_connection_program_cleanup (uc);
  else
    uc->flags |= UDP_CONN_F_CLOSING;
}

static void
udp_session_cleanup (u32 connection_index, u32 thread_index)
{
  udp_connection_t *uc;
  uc = udp_connection_get (connection_index, thread_index);
  if (!uc)
    return;
  if (uc->flags & UDP_CONN_F_MIGRATED)
    udp_connection_free (uc);
  else
    udp_connection_cleanup (uc);
}

static int
udp_session_send_params (transport_connection_t * tconn,
			 transport_send_params_t * sp)
{
  udp_connection_t *uc;

  uc = udp_connection_from_transport (tconn);

  /* No constraint on TX window */
  sp->snd_space = ~0;
  /* TODO figure out MTU of output interface */
  sp->snd_mss = uc->mss;
  sp->tx_offset = 0;
  sp->flags = 0;
  return 0;
}

static int
udp_open_connection (transport_endpoint_cfg_t * rmt)
{
  udp_main_t *um = &udp_main;
  ip46_address_t lcl_addr;
  udp_connection_t *uc;
  u32 thread_index;
  u16 lcl_port;
  int rv;

  rv = transport_alloc_local_endpoint (TRANSPORT_PROTO_UDP, rmt, &lcl_addr,
				       &lcl_port);
  if (rv)
    return rv;

  if (udp_connection_port_used_extern (clib_net_to_host_u16 (lcl_port),
				       rmt->is_ip4))
    {
      /* If specific source port was requested abort */
      if (rmt->peer.port)
	{
	  transport_release_local_endpoint (TRANSPORT_PROTO_UDP, &lcl_addr,
					    lcl_port);
	  return SESSION_E_PORTINUSE;
	}

      /* Try to find a port that's not used */
      while (udp_connection_port_used_extern (clib_net_to_host_u16 (lcl_port),
					      rmt->is_ip4))
	{
	  transport_release_local_endpoint (TRANSPORT_PROTO_UDP, &lcl_addr,
					    lcl_port);
	  lcl_port =
	    transport_alloc_local_port (TRANSPORT_PROTO_UDP, &lcl_addr, rmt);
	  if (lcl_port < 1)
	    return SESSION_E_PORTINUSE;
	}
    }

  /* We don't poll main thread if we have workers */
  thread_index = transport_cl_thread ();

  uc = udp_connection_alloc (thread_index);
  ip_copy (&uc->c_rmt_ip, &rmt->ip, rmt->is_ip4);
  ip_copy (&uc->c_lcl_ip, &lcl_addr, rmt->is_ip4);
  uc->c_rmt_port = rmt->port;
  uc->c_lcl_port = clib_host_to_net_u16 (lcl_port);
  uc->c_is_ip4 = rmt->is_ip4;
  uc->c_proto = TRANSPORT_PROTO_UDP;
  uc->c_fib_index = rmt->fib_index;
  uc->c_dscp = rmt->dscp;
  uc->mss = rmt->mss ? rmt->mss : udp_default_mtu (um, uc->c_is_ip4);
  if (rmt->peer.sw_if_index != ENDPOINT_INVALID_INDEX)
    uc->sw_if_index = rmt->peer.sw_if_index;
  uc->flags |= UDP_CONN_F_OWNS_PORT;
  if (rmt->transport_flags & TRANSPORT_CFG_F_CONNECTED)
    {
      uc->flags |= UDP_CONN_F_CONNECTED;
    }
  else
    {
      clib_spinlock_init (&uc->rx_lock);
      uc->c_flags |= TRANSPORT_CONNECTION_F_CLESS;
    }
  if (!um->csum_offload)
    uc->cfg_flags |= UDP_CFG_F_NO_CSUM_OFFLOAD;
  uc->next_node_index = rmt->next_node_index;
  uc->next_node_opaque = rmt->next_node_opaque;

  udp_connection_register_port (uc->c_lcl_port, rmt->is_ip4);

  return uc->c_c_index;
}

static transport_connection_t *
udp_session_get_half_open (u32 conn_index)
{
  udp_connection_t *uc;
  u32 thread_index;

  /* We don't poll main thread if we have workers */
  thread_index = transport_cl_thread ();
  uc = udp_connection_get (conn_index, thread_index);
  if (!uc)
    return 0;
  return &uc->connection;
}

static u8 *
format_udp_session (u8 * s, va_list * args)
{
  u32 uci = va_arg (*args, u32);
  u32 thread_index = va_arg (*args, u32);
  u32 verbose = va_arg (*args, u32);
  udp_connection_t *uc;

  uc = udp_connection_get (uci, thread_index);
  return format (s, "%U", format_udp_connection, uc, verbose);
}

static u8 *
format_udp_half_open_session (u8 * s, va_list * args)
{
  u32 __clib_unused tci = va_arg (*args, u32);
  u32 __clib_unused thread_index = va_arg (*args, u32);
  clib_warning ("BUG");
  return 0;
}

static u8 *
format_udp_listener_session (u8 * s, va_list * args)
{
  u32 tci = va_arg (*args, u32);
  u32 __clib_unused thread_index = va_arg (*args, u32);
  u32 verbose = va_arg (*args, u32);
  udp_connection_t *uc = udp_listener_get (tci);
  return format (s, "%U", format_udp_connection, uc, verbose);
}

static void
udp_realloc_ports_sv (u16 **ports_nh_svp)
{
  u16 port, port_no, *ports_nh_sv, *mc;
  u32 *ports = 0, *nh = 0, msum, i;
  sparse_vec_header_t *h;
  uword sv_index, *mb;

  ports_nh_sv = *ports_nh_svp;

  for (port = 1; port < 65535; port++)
    {
      port_no = clib_host_to_net_u16 (port);

      sv_index = sparse_vec_index (ports_nh_sv, port_no);
      if (sv_index != SPARSE_VEC_INVALID_INDEX)
	{
	  vec_add1 (ports, port_no);
	  vec_add1 (nh, ports_nh_sv[sv_index]);
	}
    }

  sparse_vec_free (ports_nh_sv);

  ports_nh_sv =
    sparse_vec_new (/* elt bytes */ sizeof (ports_nh_sv[0]),
		    /* bits in index */ BITS (((udp_header_t *) 0)->dst_port));

  vec_resize (ports_nh_sv, 65535);

  for (port = 1; port < 65535; port++)
    ports_nh_sv[port] = UDP_NO_NODE_SET;

  for (i = 0; i < vec_len (ports); i++)
    ports_nh_sv[ports[i]] = nh[i];

  h = sparse_vec_header (ports_nh_sv);
  vec_foreach (mb, h->is_member_bitmap)
    *mb = (uword) ~0;

  msum = 0;
  vec_foreach (mc, h->member_counts)
    {
      *mc = msum;
      msum += msum == 0 ? 63 : 64;
    }

  vec_free (ports);
  vec_free (nh);

  *ports_nh_svp = ports_nh_sv;
}

static clib_error_t *
udp_enable_disable (vlib_main_t *vm, u8 is_en)
{
  udp_main_t *um = &udp_main;

  /* Not ideal. The sparse vector used to map ports to next nodes assumes
   * only a few ports are ever used. When udp transport is enabled this does
   * not hold and, to make matters worse, ports are consumed in a random
   * order.
   *
   * This can lead to a lot of slow updates to internal data structures
   * which in turn can slow udp connection allocations until all ports are
   * eventually consumed.
   *
   * Consequently, reallocate sparse vector, preallocate all ports and have
   * them point to UDP_NO_NODE_SET. We could consider switching the sparse
   * vector to a preallocated vector but that would increase memory
   * consumption for vpp deployments that do not rely on host stack.
   */

  udp_realloc_ports_sv (&um->next_by_dst_port4);
  udp_realloc_ports_sv (&um->next_by_dst_port6);

  vec_validate (um->transport_ports_refcnt[0], 65535);
  vec_validate (um->transport_ports_refcnt[1], 65535);

  return 0;
}

static const transport_proto_vft_t udp_proto = {
  .enable = udp_enable_disable,
  .start_listen = udp_session_bind,
  .connect = udp_open_connection,
  .stop_listen = udp_session_unbind,
  .push_header = udp_push_header,
  .get_connection = udp_session_get,
  .get_listener = udp_session_get_listener,
  .get_half_open = udp_session_get_half_open,
  .close = udp_session_close,
  .cleanup = udp_session_cleanup,
  .send_params = udp_session_send_params,
  .format_connection = format_udp_session,
  .format_half_open = format_udp_half_open_session,
  .format_listener = format_udp_listener_session,
  .transport_options = {
    .name = "udp",
    .short_name = "U",
    .tx_type = TRANSPORT_TX_DGRAM,
    .service_type = TRANSPORT_SERVICE_CL,
  },
};

static clib_error_t *
udp_init (vlib_main_t * vm)
{
  udp_main_t *um = vnet_get_udp_main ();
  ip_main_t *im = &ip_main;
  vlib_thread_main_t *tm = vlib_get_thread_main ();
  u32 num_threads;
  ip_protocol_info_t *pi;

  /*
   * Registrations
   */

  /* IP registration */
  pi = ip_get_protocol_info (im, IP_PROTOCOL_UDP);
  if (pi == 0)
    return clib_error_return (0, "UDP protocol info AWOL");
  pi->format_header = format_udp_header;
  pi->unformat_pg_edit = unformat_pg_udp_header;

  /* Register as transport with session layer */
  transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
			       FIB_PROTOCOL_IP4, udp4_output_node.index);
  transport_register_protocol (TRANSPORT_PROTO_UDP, &udp_proto,
			       FIB_PROTOCOL_IP6, udp6_output_node.index);

  /*
   * Initialize data structures
   */

  num_threads = 1 /* main thread */  + tm->n_threads;
  vec_validate (um->wrk, num_threads - 1);

  um->local_to_input_edge[UDP_IP4] =
    vlib_node_add_next (vm, udp4_local_node.index, udp4_input_node.index);
  um->local_to_input_edge[UDP_IP6] =
    vlib_node_add_next (vm, udp6_local_node.index, udp6_input_node.index);

  um->default_mtu = 1500;
  um->csum_offload = 1;
  return 0;
}

/* *INDENT-OFF* */
VLIB_INIT_FUNCTION (udp_init) =
{
  .runs_after = VLIB_INITS("ip_main_init", "ip4_lookup_init",
                           "ip6_lookup_init"),
};
/* *INDENT-ON* */

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