aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/udp/udp_input.c
blob: 3a7de623270a1ff4155bb37945a3dadf39fdc48c (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
/*
 * Copyright (c) 2016-2019 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 <vlibmemory/api.h>
#include <vlib/vlib.h>

#include <vppinfra/hash.h>
#include <vppinfra/error.h>
#include <vppinfra/elog.h>

#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/udp/udp.h>
#include <vnet/udp/udp_packet.h>
#include <vnet/session/session.h>

static vlib_error_desc_t udp_error_counters[] = {
#define udp_error(f, n, s, d) { #n, d, VL_COUNTER_SEVERITY_##s },
#include "udp_error.def"
#undef udp_error
};

typedef struct
{
  u32 connection;
  u32 disposition;
  u32 thread_index;
} udp_input_trace_t;

/* packet trace format function */
static u8 *
format_udp_input_trace (u8 * s, va_list * args)
{
  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
  udp_input_trace_t *t = va_arg (*args, udp_input_trace_t *);

  s = format (s, "UDP_INPUT: connection %d, disposition %d, thread %d",
	      t->connection, t->disposition, t->thread_index);
  return s;
}

#define foreach_udp_input_next			\
  _ (DROP, "error-drop")

typedef enum
{
#define _(s, n) UDP_INPUT_NEXT_##s,
  foreach_udp_input_next
#undef _
    UDP_INPUT_N_NEXT,
} udp_input_next_t;

always_inline void
udp_input_inc_counter (vlib_main_t * vm, u8 is_ip4, u8 evt, u8 val)
{
  if (is_ip4)
    vlib_node_increment_counter (vm, udp4_input_node.index, evt, val);
  else
    vlib_node_increment_counter (vm, udp6_input_node.index, evt, val);
}

#define udp_store_err_counters(vm, is_ip4, cnts)			\
{									\
  int i;								\
  for (i = 0; i < UDP_N_ERROR; i++)					\
    if (cnts[i])							\
      udp_input_inc_counter(vm, is_ip4, i, cnts[i]);			\
}

#define udp_inc_err_counter(cnts, err, val)				\
{									\
  cnts[err] += val;							\
}

static void
udp_trace_buffer (vlib_main_t * vm, vlib_node_runtime_t * node,
		  vlib_buffer_t * b, session_t * s, u16 error0)
{
  udp_input_trace_t *t;

  if (PREDICT_TRUE (!(b->flags & VLIB_BUFFER_IS_TRACED)))
    return;

  t = vlib_add_trace (vm, node, b, sizeof (*t));
  t->connection = s ? s->connection_index : ~0;
  t->disposition = error0;
  t->thread_index = s ? s->thread_index : vm->thread_index;
}

static udp_connection_t *
udp_connection_accept (udp_connection_t * listener, session_dgram_hdr_t * hdr,
		       u32 thread_index)
{
  udp_connection_t *uc;

  uc = udp_connection_alloc (thread_index);
  ip_copy (&uc->c_lcl_ip, &hdr->lcl_ip, hdr->is_ip4);
  ip_copy (&uc->c_rmt_ip, &hdr->rmt_ip, hdr->is_ip4);
  uc->c_lcl_port = hdr->lcl_port;
  uc->c_rmt_port = hdr->rmt_port;
  uc->c_is_ip4 = hdr->is_ip4;
  uc->c_fib_index = listener->c_fib_index;
  uc->mss = listener->mss;
  uc->flags |= UDP_CONN_F_CONNECTED;
  uc->cfg_flags = listener->cfg_flags;

  if (session_dgram_accept (&uc->connection, listener->c_s_index,
			    listener->c_thread_index))
    {
      udp_connection_free (uc);
      return 0;
    }

  udp_connection_share_port (uc->c_lcl_port, uc->c_is_ip4);
  return uc;
}

static void
udp_connection_enqueue (udp_connection_t * uc0, session_t * s0,
			session_dgram_hdr_t * hdr0, u32 thread_index,
			vlib_buffer_t * b, u8 queue_event, u32 * error0)
{
  int wrote0;

  if (!(uc0->flags & UDP_CONN_F_CONNECTED))
    {
      clib_spinlock_lock (&uc0->rx_lock);

      wrote0 = session_enqueue_dgram_connection_cl (
	s0, hdr0, b, TRANSPORT_PROTO_UDP, queue_event);

      clib_spinlock_unlock (&uc0->rx_lock);

      /* Expect cl udp enqueue to fail because fifo enqueue */
      if (PREDICT_FALSE (wrote0 == 0))
	*error0 = UDP_ERROR_FIFO_FULL;

      return;
    }

  if (svm_fifo_max_enqueue_prod (s0->rx_fifo)
      < hdr0->data_length + sizeof (session_dgram_hdr_t))
    {
      *error0 = UDP_ERROR_FIFO_FULL;
      return;
    }

  /* If session is owned by another thread and rx event needed,
   * enqueue event now while we still have the peeker lock */
  if (s0->thread_index != thread_index)
    {
      wrote0 = session_enqueue_dgram_connection2 (
	s0, hdr0, b, TRANSPORT_PROTO_UDP,
	queue_event && !svm_fifo_has_event (s0->rx_fifo));
    }
  else
    {
      wrote0 = session_enqueue_dgram_connection (
	s0, hdr0, b, TRANSPORT_PROTO_UDP, queue_event);
    }

  /* In some rare cases, session_enqueue_dgram_connection can fail because a
   * chunk cannot be allocated in the RX FIFO */
  if (PREDICT_FALSE (wrote0 == 0))
    *error0 = UDP_ERROR_FIFO_NOMEM;
}

always_inline session_t *
udp_parse_and_lookup_buffer (vlib_buffer_t * b, session_dgram_hdr_t * hdr,
			     u8 is_ip4)
{
  udp_header_t *udp;
  u32 fib_index;
  session_t *s;

  /* udp_local hands us a pointer to the udp data */
  udp = (udp_header_t *) (vlib_buffer_get_current (b) - sizeof (*udp));
  fib_index = vnet_buffer (b)->ip.fib_index;

  hdr->data_offset = 0;
  hdr->lcl_port = udp->dst_port;
  hdr->rmt_port = udp->src_port;
  hdr->is_ip4 = is_ip4;
  hdr->gso_size = 0;

  if (is_ip4)
    {
      ip4_header_t *ip4;

      /* TODO: must fix once udp_local does ip options correctly */
      ip4 = (ip4_header_t *) (((u8 *) udp) - sizeof (*ip4));
      ip_set (&hdr->lcl_ip, &ip4->dst_address, 1);
      ip_set (&hdr->rmt_ip, &ip4->src_address, 1);
      hdr->data_length = clib_net_to_host_u16 (ip4->length);
      hdr->data_length -= sizeof (ip4_header_t) + sizeof (udp_header_t);
      s = session_lookup_safe4 (fib_index, &ip4->dst_address,
				&ip4->src_address, udp->dst_port,
				udp->src_port, TRANSPORT_PROTO_UDP);
    }
  else
    {
      ip6_header_t *ip60;

      ip60 = (ip6_header_t *) (((u8 *) udp) - sizeof (*ip60));
      ip_set (&hdr->lcl_ip, &ip60->dst_address, 0);
      ip_set (&hdr->rmt_ip, &ip60->src_address, 0);
      hdr->data_length = clib_net_to_host_u16 (ip60->payload_length);
      hdr->data_length -= sizeof (udp_header_t);
      s = session_lookup_safe6 (fib_index, &ip60->dst_address,
				&ip60->src_address, udp->dst_port,
				udp->src_port, TRANSPORT_PROTO_UDP);
    }

  /* Set the sw_if_index[VLIB_RX] to the interface we received
   * the connection on (the local interface) */
  vnet_buffer (b)->sw_if_index[VLIB_RX] = vnet_buffer (b)->ip.rx_sw_if_index;

  if (PREDICT_TRUE (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)))
    b->current_length = hdr->data_length;
  else
    b->total_length_not_including_first_buffer = hdr->data_length
      - b->current_length;

  return s;
}

always_inline uword
udp46_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
		    vlib_frame_t * frame, u8 is_ip4)
{
  u32 thread_index = vm->thread_index, n_left_from, *from, *first_buffer;
  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
  u16 err_counters[UDP_N_ERROR] = { 0 };

  from = first_buffer = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  vlib_get_buffers (vm, from, bufs, n_left_from);

  b = bufs;

  while (n_left_from > 0)
    {
      u32 error0 = UDP_ERROR_ENQUEUED;
      session_dgram_hdr_t hdr0;
      udp_connection_t *uc0;
      session_t *s0;

      s0 = udp_parse_and_lookup_buffer (b[0], &hdr0, is_ip4);
      if (PREDICT_FALSE (!s0))
	{
	  error0 = UDP_ERROR_NO_LISTENER;
	  goto done;
	}

      if (s0->session_state == SESSION_STATE_OPENED)
	{
	  u8 queue_event = 1;
	  uc0 = udp_connection_from_transport (session_get_transport (s0));
	  uc0->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
	  if (uc0->flags & UDP_CONN_F_CONNECTED)
	    {
	      if (s0->thread_index != thread_index)
		{
		  /*
		   * Clone the transport. It will be cleaned up with the
		   * session once we notify the session layer.
		   */
		  uc0 = udp_connection_clone_safe (s0->connection_index,
						   s0->thread_index);
		  ASSERT (s0->session_index == uc0->c_s_index);

		  /*
		   * Ask session layer for a new session.
		   */
		  session_dgram_connect_notify (&uc0->connection,
						s0->thread_index, &s0);
		  queue_event = 0;
		}
	      else
		s0->session_state = SESSION_STATE_READY;
	    }
	  udp_connection_enqueue (uc0, s0, &hdr0, thread_index, b[0],
				  queue_event, &error0);
	}
      else if (s0->session_state == SESSION_STATE_READY ||
	       s0->session_state == SESSION_STATE_ACCEPTING)
	{
	  uc0 = udp_connection_from_transport (session_get_transport (s0));
	  udp_connection_enqueue (uc0, s0, &hdr0, thread_index, b[0], 1,
				  &error0);
	}
      else if (s0->session_state == SESSION_STATE_LISTENING)
	{
	  uc0 = udp_connection_from_transport (session_get_transport (s0));
	  if (uc0->flags & UDP_CONN_F_CONNECTED)
	    {
	      uc0 = udp_connection_accept (uc0, &hdr0, thread_index);
	      if (!uc0)
		{
		  error0 = UDP_ERROR_CREATE_SESSION;
		  goto done;
		}
	      s0 = session_get (uc0->c_s_index, uc0->c_thread_index);
	      uc0->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
	      error0 = UDP_ERROR_ACCEPT;
	    }
	  udp_connection_enqueue (uc0, s0, &hdr0, thread_index, b[0], 1,
				  &error0);
	}
      else
	{
	  error0 = UDP_ERROR_NOT_READY;
	}

    done:
      if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
	udp_trace_buffer (vm, node, b[0], s0, error0);

      b += 1;
      n_left_from -= 1;

      udp_inc_err_counter (err_counters, error0, 1);
    }

  vlib_buffer_free (vm, first_buffer, frame->n_vectors);
  session_main_flush_enqueue_events (TRANSPORT_PROTO_UDP, thread_index);
  udp_store_err_counters (vm, is_ip4, err_counters);
  return frame->n_vectors;
}

static uword
udp4_input (vlib_main_t * vm, vlib_node_runtime_t * node,
	    vlib_frame_t * frame)
{
  return udp46_input_inline (vm, node, frame, 1);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (udp4_input_node) =
{
  .function = udp4_input,
  .name = "udp4-input",
  .vector_size = sizeof (u32),
  .format_trace = format_udp_input_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = UDP_N_ERROR,
  .error_counters = udp_error_counters,
  .n_next_nodes = UDP_INPUT_N_NEXT,
  .next_nodes = {
#define _(s, n) [UDP_INPUT_NEXT_##s] = n,
      foreach_udp_input_next
#undef _
  },
};
/* *INDENT-ON* */

static uword
udp6_input (vlib_main_t * vm, vlib_node_runtime_t * node,
	    vlib_frame_t * frame)
{
  return udp46_input_inline (vm, node, frame, 0);
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (udp6_input_node) =
{
  .function = udp6_input,
  .name = "udp6-input",
  .vector_size = sizeof (u32),
  .format_trace = format_udp_input_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = UDP_N_ERROR,
  .error_counters = udp_error_counters,
  .n_next_nodes = UDP_INPUT_N_NEXT,
  .next_nodes = {
#define _(s, n) [UDP_INPUT_NEXT_##s] = n,
      foreach_udp_input_next
#undef _
  },
};
/* *INDENT-ON* */

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