aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/dns/reply_node.c
blob: e045ba8cda4b05ec388d42949765b2bad51fab6d (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
/*
 * Copyright (c) 2017 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/dns/dns.h>

#include <vlib/vlib.h>
#include <vnet/vnet.h>

vlib_node_registration_t dns46_reply_node;

typedef struct
{
  u32 pool_index;
  u32 disposition;
} dns46_reply_trace_t;

/* packet trace format function */
static u8 *
format_dns46_reply_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 *);
  dns46_reply_trace_t *t = va_arg (*args, dns46_reply_trace_t *);

  s = format (s, "DNS46_REPLY: pool index %d, disposition  %d",
	      t->pool_index, t->disposition);
  return s;
}

vlib_node_registration_t dns46_reply_node;

static char *dns46_reply_error_strings[] = {
#define _(sym,string) string,
  foreach_dns46_reply_error
#undef _
};

typedef enum
{
  DNS46_REPLY_NEXT_DROP,
  DNS46_REPLY_N_NEXT,
} dns46_reply_next_t;

static uword
dns46_reply_node_fn (vlib_main_t * vm,
		     vlib_node_runtime_t * node, vlib_frame_t * frame)
{
  u32 n_left_from, *from, *to_next;
  dns46_reply_next_t next_index;

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

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

#if 0
      while (n_left_from >= 4 && n_left_to_next >= 2)
	{
	  u32 next0 = DNS46_REPLY_NEXT_INTERFACE_OUTPUT;
	  u32 next1 = DNS46_REPLY_NEXT_INTERFACE_OUTPUT;
	  u32 sw_if_index0, sw_if_index1;
	  u8 tmp0[6], tmp1[6];
	  ethernet_header_t *en0, *en1;
	  u32 bi0, bi1;
	  vlib_buffer_t *b0, *b1;

	  /* Prefetch next iteration. */
	  {
	    vlib_buffer_t *p2, *p3;

	    p2 = vlib_get_buffer (vm, from[2]);
	    p3 = vlib_get_buffer (vm, from[3]);

	    vlib_prefetch_buffer_header (p2, LOAD);
	    vlib_prefetch_buffer_header (p3, LOAD);

	    CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
	    CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
	  }

	  /* speculatively enqueue b0 and b1 to the current next frame */
	  to_next[0] = bi0 = from[0];
	  to_next[1] = bi1 = from[1];
	  from += 2;
	  to_next += 2;
	  n_left_from -= 2;
	  n_left_to_next -= 2;

	  b0 = vlib_get_buffer (vm, bi0);
	  b1 = vlib_get_buffer (vm, bi1);

	  /* $$$$$ End of processing 2 x packets $$$$$ */

	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
	    {
	      if (b0->flags & VLIB_BUFFER_IS_TRACED)
		{
		  dns46_reply_trace_t *t =
		    vlib_add_trace (vm, node, b0, sizeof (*t));
		  t->sw_if_index = sw_if_index0;
		  t->next_index = next0;
		}
	      if (b1->flags & VLIB_BUFFER_IS_TRACED)
		{
		  dns46_reply_trace_t *t =
		    vlib_add_trace (vm, node, b1, sizeof (*t));
		  t->sw_if_index = sw_if_index1;
		  t->next_index = next1;
		}
	    }

	  /* verify speculative enqueues, maybe switch current next frame */
	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
					   to_next, n_left_to_next,
					   bi0, bi1, next0, next1);
	}
#endif

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  u32 bi0;
	  vlib_buffer_t *b0;
	  u32 next0 = DNS46_REPLY_NEXT_DROP;
	  dns_header_t *d0;
	  u32 pool_index0;
	  u32 error0;
	  u8 *resp0 = 0;

	  /* speculatively enqueue b0 to the current next frame */
	  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);
	  d0 = vlib_buffer_get_current (b0);

	  pool_index0 = clib_host_to_net_u16 (d0->id);

	  /* Save the reply */
	  vec_validate (resp0, vlib_buffer_length_in_chain (vm, b0) - 1);
	  clib_memcpy (resp0, d0, vlib_buffer_length_in_chain (vm, b0));

	  /*
	   * Deal with everything in process ctx on the main thread
	   */
	  vlib_process_signal_event_mt (vm, dns_resolver_node.index,
					DNS_RESOLVER_EVENT_RESOLVED,
					(uword) resp0);
	  error0 = DNS46_REPLY_ERROR_PROCESSED;

	  b0->error = node->errors[error0];

	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
	    {
	      dns46_reply_trace_t *t =
		vlib_add_trace (vm, node, b0, sizeof (*t));
	      t->disposition = error0;
	      t->pool_index = pool_index0;
	    }

	  /* 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);
    }

  return frame->n_vectors;
}

VLIB_REGISTER_NODE (dns46_reply_node) =
{
  .function = dns46_reply_node_fn,.name = "dns46_reply",.vector_size =
    sizeof (u32),.format_trace = format_dns46_reply_trace,.type =
    VLIB_NODE_TYPE_INTERNAL,.n_errors =
    ARRAY_LEN (dns46_reply_error_strings),.error_strings =
    dns46_reply_error_strings,.n_next_nodes = DNS46_REPLY_N_NEXT,
    /* edit / add dispositions here */
    .next_nodes =
  {
  [DNS46_REPLY_NEXT_DROP] = "error-drop",}
,};

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