summaryrefslogtreecommitdiffstats
path: root/extras/deprecated/plugins/l2e/l2e_node.c
blob: 71c9b4bc6afc6f7cbedef80a75130f2f137fa2a9 (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
/*
 * l2e_node.c : l2 emulation node
 *
 * Copyright (c) 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 <plugins/l2e/l2e.h>
#include <vnet/l2/l2_input.h>
#include <vnet/l2/feat_bitmap.h>

#define foreach_l2_emulation                    \
  _(IP4, "Extract IPv4")                        \
  _(IP6, "Extract IPv6")

typedef enum
{
#define _(sym,str) L2_EMULATION_ERROR_##sym,
  foreach_l2_emulation
#undef _
    L2_EMULATION_N_ERROR,
} l2_emulation_error_t;

static char *l2_emulation_error_strings[] = {
#define _(sym,string) string,
  foreach_l2_emulation
#undef _
};

typedef enum
{
#define _(sym,str) L2_EMULATION_NEXT_##sym,
  foreach_l2_emulation
#undef _
    L2_EMULATION_N_NEXT,
} l2_emulation_next_t;

/* packet trace format function */
static u8 *
format_l2_emulation_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 *);
  l2_emulation_trace_t *t = va_arg (*args, l2_emulation_trace_t *);

  s = format (s, "l2-emulation: %s", (t->extracted ? "yes" : "no"));

  return s;
}

VLIB_NODE_FN (l2_emulation_node) (vlib_main_t * vm,
				  vlib_node_runtime_t * node,
				  vlib_frame_t * frame)
{
  l2_emulation_main_t *em = &l2_emulation_main;
  u32 n_left_from, *from, *to_next;
  l2_emulation_next_t next_index;
  u32 ip4_hits = 0;
  u32 ip6_hits = 0;

  next_index = 0;
  n_left_from = frame->n_vectors;
  from = vlib_frame_vector_args (frame);

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
      while (n_left_from >= 4 && n_left_to_next >= 2)
	{
	  vlib_buffer_t *b0, *b1;
	  u32 sw_if_index0, sw_if_index1;
	  u16 ether_type0, ether_type1;
	  u32 next0 = ~0, next1 = ~0;
	  u8 l2_len0, l2_len1;
	  u32 bi0, bi1;
	  u8 *h0, *h1;

	  bi0 = to_next[0] = from[0];
	  bi1 = to_next[1] = from[1];

	  from += 2;
	  n_left_from -= 2;
	  to_next += 2;
	  n_left_to_next -= 2;

	  b0 = vlib_get_buffer (vm, bi0);
	  b1 = vlib_get_buffer (vm, bi1);
	  l2_len0 = vnet_buffer (b0)->l2.l2_len;
	  l2_len1 = vnet_buffer (b1)->l2.l2_len;

	  h0 = vlib_buffer_get_current (b0);
	  h1 = vlib_buffer_get_current (b1);

	  ether_type0 = clib_net_to_host_u16 (*(u16 *) (h0 + l2_len0 - 2));
	  ether_type1 = clib_net_to_host_u16 (*(u16 *) (h1 + l2_len1 - 2));
	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
	  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];

	  /*
	   * only extract unicast
	   */
	  if (PREDICT_TRUE (!(h0[0] & 0x1)))
	    {
	      switch (ether_type0)
		{
		case ETHERNET_TYPE_IP4:
		  ASSERT (em->l2_emulations[sw_if_index0].enabled);
		  ++ip4_hits;
		  next0 = L2_EMULATION_NEXT_IP4;
		  vlib_buffer_advance (b0, l2_len0);
		  break;
		case ETHERNET_TYPE_IP6:
		  ASSERT (em->l2_emulations[sw_if_index0].enabled);
		  ++ip6_hits;
		  next0 = L2_EMULATION_NEXT_IP6;
		  vlib_buffer_advance (b0, l2_len0);
		default:
		  break;
		}
	    }
	  if (PREDICT_TRUE (!(h1[0] & 0x1)))
	    {
	      switch (ether_type1)
		{
		case ETHERNET_TYPE_IP4:
		  ASSERT (em->l2_emulations[sw_if_index1].enabled);
		  ++ip4_hits;
		  next1 = L2_EMULATION_NEXT_IP4;
		  vlib_buffer_advance (b1, l2_len1);
		  break;
		case ETHERNET_TYPE_IP6:
		  ASSERT (em->l2_emulations[sw_if_index1].enabled);
		  ++ip6_hits;
		  next1 = L2_EMULATION_NEXT_IP6;
		  vlib_buffer_advance (b1, l2_len1);
		default:
		  break;
		}
	    }
	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
	    {
	      l2_emulation_trace_t *t =
		vlib_add_trace (vm, node, b0, sizeof (*t));
	      t->extracted = (next0 != ~0);
	    }
	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
			     && (b1->flags & VLIB_BUFFER_IS_TRACED)))
	    {
	      l2_emulation_trace_t *t =
		vlib_add_trace (vm, node, b1, sizeof (*t));
	      t->extracted = (next1 != ~0);
	    }

	  /* Determine the next node and remove ourself from bitmap */
	  if (PREDICT_TRUE (next0 == ~0))
	    next0 = vnet_l2_feature_next (b0, em->l2_input_feat_next,
					  L2INPUT_FEAT_L2_EMULATION);

	  /* Determine the next node and remove ourself from bitmap */
	  if (PREDICT_TRUE (next1 == ~0))
	    next1 = vnet_l2_feature_next (b1, em->l2_input_feat_next,
					  L2INPUT_FEAT_L2_EMULATION);

	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
					   to_next, n_left_to_next,
					   bi0, bi1, next0, next1);
	}
      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  vlib_buffer_t *b0;
	  u32 sw_if_index0;
	  u16 ether_type0;
	  u32 next0 = ~0;
	  u8 l2_len0;
	  u32 bi0;
	  u8 *h0;

	  bi0 = from[0];
	  to_next[0] = bi0;
	  from += 1;
	  to_next += 1;
	  n_left_from -= 1;
	  n_left_to_next -= 1;

	  b0 = vlib_get_buffer (vm, bi0);
	  l2_len0 = vnet_buffer (b0)->l2.l2_len;

	  h0 = vlib_buffer_get_current (b0);
	  ether_type0 = clib_net_to_host_u16 (*(u16 *) (h0 + l2_len0 - 2));
	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];

	  /*
	   * only extract unicast
	   */
	  if (PREDICT_TRUE (!(h0[0] & 0x1)))
	    {
	      switch (ether_type0)
		{
		case ETHERNET_TYPE_IP4:
		  ASSERT (em->l2_emulations[sw_if_index0].enabled);
		  ++ip4_hits;
		  next0 = L2_EMULATION_NEXT_IP4;
		  vlib_buffer_advance (b0, l2_len0);
		  break;
		case ETHERNET_TYPE_IP6:
		  ASSERT (em->l2_emulations[sw_if_index0].enabled);
		  ++ip6_hits;
		  next0 = L2_EMULATION_NEXT_IP6;
		  vlib_buffer_advance (b0, l2_len0);
		default:
		  break;
		}
	    }

	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
	    {
	      l2_emulation_trace_t *t =
		vlib_add_trace (vm, node, b0, sizeof (*t));
	      t->extracted = (next0 != ~0);
	    }

	  /* Determine the next node and remove ourself from bitmap */
	  if (PREDICT_TRUE (next0 == ~0))
	    next0 = vnet_l2_feature_next (b0, em->l2_input_feat_next,
					  L2INPUT_FEAT_L2_EMULATION);

	  /* verify speculative enqueue, maybe switch current next frame */
	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
					   to_next, n_left_to_next,
					   bi0, next0);
	}

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  vlib_node_increment_counter (vm, node->node_index,
			       L2_EMULATION_ERROR_IP4, ip4_hits);
  vlib_node_increment_counter (vm, node->node_index,
			       L2_EMULATION_ERROR_IP6, ip6_hits);

  return frame->n_vectors;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (l2_emulation_node) = {
  .name = "l2-emulation",
  .vector_size = sizeof (u32),
  .format_trace = format_l2_emulation_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,

  .n_errors = ARRAY_LEN(l2_emulation_error_strings),
  .error_strings = l2_emulation_error_strings,

  .n_next_nodes = L2_EMULATION_N_NEXT,

  /* edit / add dispositions here */
  .next_nodes = {
    [L2_EMULATION_NEXT_IP4] = "ip4-input",
    [L2_EMULATION_NEXT_IP6] = "ip6-input",
  },
};
/* *INDENT-ON* */

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