summaryrefslogtreecommitdiffstats
path: root/hicn-plugin/src/mapme_ctrl_node.c
blob: 22a50d49e901d33206c1439665eb657983e3cf76 (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
/*
 * Copyright (c) 2017-2019 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.
 */

/*
 * This node processses MAP-Me control messages.
 */
#include <vnet/ip/ip6_packet.h>
#include <vnet/dpo/load_balance.h>
#include <hicn/hicn.h>

#include "mapme.h"
#include "mapme_ctrl.h"
#include "mapme_eventmgr.h"
#include "mgmt.h"
#include "parser.h"
#include "infra.h"
#include "strategy_dpo_manager.h"
#include "error.h"
#include "state.h"

extern hicn_mapme_main_t mapme_main;

#define MS2NS(x) x * 1000000

/* Functions declarations */

/* packet trace format function */
static u8 *hicn_mapme_ctrl_format_trace (u8 * s, va_list * args);


/* Stats string values */
static char *hicn_mapme_ctrl_error_strings[] = {
#define _(sym, string) string,
  foreach_hicnfwd_error
#undef _
};

/**
 * Preprocess the ingress face so as to make it a candidate next hop, which is
 * what MAP-Me will handle
 */
static_always_inline void
preprocess_in_face (hicn_type_t type, dpo_id_t * in, dpo_id_t * out)
{
  u32 vlib_edge = hicn_mapme_get_dpo_vlib_edge (in);
  *out = *in;
  out->dpoi_next_node = vlib_edge;
}

/*
 * @brief Process incoming control messages (Interest Update)
 * @param vm vlib main data structure
 * @param b Control packet (IU)
 * @param face_id Ingress face id
 *
 * NOTE:
 *  - this function answers locally to the IU interest by replying with a Ack
 *  (Data) packet, unless in case of outdated information, in which we can
 *  consider the interest is dropped, and another IU (aka ICMP error) is sent so
 *  that retransmissions stop.
 */
static_always_inline bool
hicn_mapme_process_ctrl (vlib_main_t * vm, vlib_buffer_t * b,
			 dpo_id_t * in_face)
{
  seq_t fib_seq;
  const dpo_id_t *dpo;
  hicn_prefix_t prefix;
  mapme_params_t params;
  int rc;

  /* Parse incoming message */
  rc =
    hicn_mapme_parse_packet (vlib_buffer_get_current (b), &prefix, &params);
  if (rc < 0)
    goto ERR_PARSE;

  vlib_cli_output (vm, "IU - type:%d seq:%d len:%d", params.type, params.seq,
		   prefix.len);

  /* if (params.seq == INVALID_SEQ) */
  /*   { */
  /*     vlib_log_warn (mapme_main.log_class, */
  /*       	     "Invalid sequence number found in IU"); */

  /*     return true; */
  /*   } */

  /* We forge the ACK which we be the packet forwarded by the node */
  hicn_mapme_create_ack (vlib_buffer_get_current (b), &params);

  dpo = fib_epm_lookup (&prefix.name, prefix.len);
  if (!dpo)
    {
#ifdef HICN_MAPME_ALLOW_NONEXISTING_FIB_ENTRY
      /*
       * This might happen for a node hosting a producer which has moved.
       * Destroying the face has led to removing all corresponding FIB
       * entries. In that case, we need to correctly restore the FIB entries.
       */
      DEBUG ("Re-creating FIB entry with next hop on connection")
#error "not implemented"
#else
      //ERROR("Received IU for non-existing FIB entry");
      return false;
#endif /* HICN_MAPME_ALLOW_NONEXISTING_FIB_ENTRY */

    }

#ifdef HICN_MAPME_ALLOW_LOCATORS
  if (!dpo_is_hicn ((dpo)))
    {
      /* We have an IP DPO */
      WARN ("Not implemented yet.");
      return false;
    }
#endif

  /* Process the hICN DPO */
  const hicn_dpo_vft_t *dpo_vft = hicn_dpo_get_vft (dpo->dpoi_type);
  hicn_mapme_tfib_t *tfib =
    TFIB (dpo_vft->hicn_dpo_get_ctx (dpo->dpoi_index));
  fib_seq = tfib->seq;

  if (params.seq > fib_seq)
    {
      DEBUG
	("Higher sequence number than FIB %d > %d, updating seq and next hops",
	 params.seq, fib_seq);

      /* This has to be done first to allow processing ack */
      tfib->seq = params.seq;

      // in_face and next_hops are face_id_t

      /* Remove ingress face from TFIB in case it was present */
      hicn_mapme_tfib_del (tfib, in_face);

      /* Move next hops to TFIB... but in_face... */
      for (u8 pos = 0; pos < tfib->entry_count; pos++)
	{
	  if (dpo_cmp (&tfib->next_hops[pos], in_face) == 0)
	    continue;
	  hicn_mapme_tfib_add (tfib, &tfib->next_hops[pos]);
	}

      /* ... and set ingress face as next_hop */
      in_face->dpoi_next_node = hicn_mapme_get_dpo_vlib_edge (in_face);
      hicn_mapme_nh_set (tfib, in_face);

      /* We transmit both the prefix and the full dpo (type will be needed to pick the right transmit node */
      retx_t *retx = vlib_process_signal_event_data (vm,
						     hicn_mapme_eventmgr_process_node.index,
						     HICN_MAPME_EVENT_FACE_NH_SET,
						     1,
						     sizeof (retx_t));
      *retx = (retx_t)
      {
      .prefix = prefix,.dpo = *dpo};

    }
  else if (params.seq == fib_seq)
    {
      DEBUG ("Same sequence number than FIB %d > %d, adding next hop",
	     params.seq, fib_seq);

      /* Remove ingress face from TFIB in case it was present */
      hicn_mapme_tfib_del (tfib, in_face);

      /* Add ingress face to next hops */
      hicn_mapme_nh_add (tfib, in_face);

      /* Multipath, multihoming, multiple producers or duplicate interest */
      retx_t *retx = vlib_process_signal_event_data (vm,
						     hicn_mapme_eventmgr_process_node.index,
						     HICN_MAPME_EVENT_FACE_NH_ADD,
						     1,
						     sizeof (retx_t));
      *retx = (retx_t)
      {
      .prefix = prefix,.dpo = *dpo};
    }
  else				// params.seq < fib_seq
    {
      /*
       * face is propagating outdated information, we can just consider it as a
       * prevHops
       */
      hicn_mapme_tfib_add (tfib, in_face);

      retx_t *retx = vlib_process_signal_event_data (vm,
						     hicn_mapme_eventmgr_process_node.index,
						     HICN_MAPME_EVENT_FACE_PH_ADD,
						     1,
						     sizeof (retx_t));
      *retx = (retx_t)
      {
      .prefix = prefix,.dpo = *dpo};
    }

  /* We just raise events, the event_mgr is in charge of forging packet. */

  return true;

//ERR_ACK_CREATE:
ERR_PARSE:
  return false;
}

vlib_node_registration_t hicn_mapme_ctrl_node;

static uword
hicn_mapme_ctrl_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
			 vlib_frame_t * frame)
{
  hicn_buffer_t *hb;
  hicn_mapme_ctrl_next_t next_index;
  u32 n_left_from, *from, *to_next;
  n_left_from = frame->n_vectors;
  dpo_id_t in_face;

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

  while (n_left_from > 0)	// buffers in the current frame
    {
      u32 n_left_to_next;
      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);


      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  u32 bi0;
	  vlib_buffer_t *b0;

	  /* 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);
	  hb = hicn_get_buffer (b0);

	  /* This determines the next node on which the ack will be sent back */
	  u32 next0 = hicn_mapme_get_dpo_iface_node (&hb->face_dpo_id);

	  /* Preprocessing is needed to precompute in the dpo the next node
	   * that will have to be followed by regular interests when being
	   * forwarder on a given next hop
	   */
	  preprocess_in_face (hb->type, &hb->face_dpo_id, &in_face);
	  hicn_mapme_process_ctrl (vm, b0, &in_face);

          vnet_buffer (b0)->ip.adj_index[VLIB_TX] = in_face.dpoi_index;

	  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, hicn_mapme_ctrl_node.index,
  //                               HICN_MAPME_CTRL_ERROR_SWAPPED, pkts_swapped);
  return frame->n_vectors;
}

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

  s = format (s, "MAPME_CTRL: pkt: %d, sw_if_index %d, next index %d",
	      (int) t->pkt_type, t->sw_if_index, t->next_index);
  return (s);
}


/*
 * Node registration for the MAP-Me node processing special interests
 */
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (hicn_mapme_ctrl_node) =
{
  .function = hicn_mapme_ctrl_node_fn,
  .name = "hicn-mapme-ctrl",
  .vector_size =  sizeof (u32),
  .runtime_data_bytes = sizeof (hicn_mapme_ctrl_runtime_t),
  .format_trace = hicn_mapme_ctrl_format_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN (hicn_mapme_ctrl_error_strings),
  .error_strings = hicn_mapme_ctrl_error_strings,
  .n_next_nodes = HICN_MAPME_CTRL_N_NEXT,
  .next_nodes =
  {
    /*
     * Control packets are not forwarded by this node, but sent by the Event
     * Manager. This node is only responsible for sending ACK back,
     * Acks are like data packets are output on iface's
     */
    [HICN_MAPME_CTRL_NEXT_IP4_OUTPUT]   = "hicn-iface-ip4-output",
    [HICN_MAPME_CTRL_NEXT_IP6_OUTPUT]   = "hicn-iface-ip6-output",
    [HICN_MAPME_CTRL_NEXT_UDP46_OUTPUT] = "hicn-iface-udp4-output",
    [HICN_MAPME_CTRL_NEXT_UDP66_OUTPUT] = "hicn-iface-udp6-output",
    [HICN_MAPME_CTRL_NEXT_ERROR_DROP]   = "error-drop",
  },
};
/* *INDENT-ON* */

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