aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/lisp-cp/lisp_msg_serdes.c
blob: 6c0a7219f315dfe90db4239cfb730e2b5fb7c3ac (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
/*
 * Copyright (c) 2016 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/lisp-cp/lisp_msg_serdes.h>
#include <vnet/lisp-cp/packets.h>
#include <vppinfra/time.h>

void *lisp_msg_put_gid (vlib_buffer_t * b, gid_address_t * gid);

static void
lisp_msg_put_locators (vlib_buffer_t * b, locator_t * locators)
{
  locator_t *loc;

  vec_foreach (loc, locators)
  {
    u8 *p = vlib_buffer_put_uninit (b, sizeof (locator_hdr_t));
    memset (p, 0, sizeof (locator_hdr_t));
    LOC_PRIORITY (p) = loc->priority;
    LOC_MPRIORITY (p) = loc->mpriority;
    LOC_WEIGHT (p) = loc->weight;
    LOC_MWEIGHT (p) = loc->mweight;
    LOC_LOCAL (p) = loc->local;
    LOC_PROBED (p) = loc->probed ? 1 : 0;
    lisp_msg_put_gid (b, &loc->address);
  }
}

static void
lisp_msg_put_mapping_record (vlib_buffer_t * b, mapping_t * record)
{
  mapping_record_hdr_t *p =
    vlib_buffer_put_uninit (b, sizeof (mapping_record_hdr_t));
  gid_address_t *eid = &record->eid;

  memset (p, 0, sizeof (*p));
  MAP_REC_EID_PLEN (p) = gid_address_len (eid);
  MAP_REC_TTL (p) = clib_host_to_net_u32 (MAP_REGISTER_DEFAULT_TTL);
  MAP_REC_AUTH (p) = record->authoritative ? 1 : 0;
  MAP_REC_LOC_COUNT (p) = vec_len (record->locators);

  lisp_msg_put_gid (b, eid);
  lisp_msg_put_locators (b, record->locators);
}

static void
lisp_msg_put_mreg_records (vlib_buffer_t * b, mapping_t * records)
{
  u32 i;
  for (i = 0; i < vec_len (records); i++)
    lisp_msg_put_mapping_record (b, &records[i]);
}

void *
lisp_msg_put_gid (vlib_buffer_t * b, gid_address_t * gid)
{
  u8 *p = 0;
  if (!gid)
    {
      /* insert only src-eid-afi field set to 0 */
      p = vlib_buffer_put_uninit (b, sizeof (u16));
      *(u16 *) p = 0;
    }
  else
    {
      p = vlib_buffer_put_uninit (b, gid_address_size_to_put (gid));
      gid_address_put (p, gid);
    }
  return p;
}

static void *
lisp_msg_put_itr_rlocs (lisp_cp_main_t * lcm, vlib_buffer_t * b,
			gid_address_t * rlocs, u8 * locs_put)
{
  u8 *bp, count = 0;
  u32 i;

  bp = vlib_buffer_get_current (b);
  for (i = 0; i < vec_len (rlocs); i++)
    {
      lisp_msg_put_gid (b, &rlocs[i]);
      count++;
    }

  *locs_put = count - 1;
  return bp;
}

void *
lisp_msg_put_eid_rec (vlib_buffer_t * b, gid_address_t * eid)
{
  eid_record_hdr_t *h = vlib_buffer_put_uninit (b, sizeof (*h));

  memset (h, 0, sizeof (*h));
  EID_REC_MLEN (h) = gid_address_len (eid);
  lisp_msg_put_gid (b, eid);
  return h;
}

u64
nonce_build (u32 seed)
{
  u64 nonce;
  u32 nonce_lower;
  u32 nonce_upper;
  struct timespec ts;

  /* Put nanosecond clock in lower 32-bits and put an XOR of the nanosecond
   * clock with the seond clock in the upper 32-bits. */
  syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts);
  nonce_lower = ts.tv_nsec;
  nonce_upper = ts.tv_sec ^ clib_host_to_net_u32 (nonce_lower);

  /* OR in a caller provided seed to the low-order 32-bits. */
  nonce_lower |= seed;

  /* Return 64-bit nonce. */
  nonce = nonce_upper;
  nonce = (nonce << 32) | nonce_lower;
  return nonce;
}

void *
lisp_msg_put_map_reply (vlib_buffer_t * b, mapping_t * records, u64 nonce,
			u8 probe_bit)
{
  map_reply_hdr_t *h = vlib_buffer_put_uninit (b, sizeof (h[0]));

  memset (h, 0, sizeof (h[0]));
  MREP_TYPE (h) = LISP_MAP_REPLY;
  MREP_NONCE (h) = nonce;
  MREP_REC_COUNT (h) = 1;
  MREP_RLOC_PROBE (h) = probe_bit;

  lisp_msg_put_mreg_records (b, records);
  return h;
}

void *
lisp_msg_put_map_register (vlib_buffer_t * b, mapping_t * records,
			   u8 want_map_notify, u16 auth_data_len, u64 * nonce,
			   u32 * msg_len)
{
  u8 *auth_data = 0;

  /* Basic header init */
  map_register_hdr_t *h = vlib_buffer_put_uninit (b, sizeof (h[0]));

  memset (h, 0, sizeof (h[0]));
  MREG_TYPE (h) = LISP_MAP_REGISTER;
  MREG_NONCE (h) = nonce_build (0);
  MREG_WANT_MAP_NOTIFY (h) = want_map_notify ? 1 : 0;
  MREG_REC_COUNT (h) = vec_len (records);

  auth_data = vlib_buffer_put_uninit (b, auth_data_len);
  memset (auth_data, 0, auth_data_len);

  /* Put map register records */
  lisp_msg_put_mreg_records (b, records);

  nonce[0] = MREG_NONCE (h);
  msg_len[0] = vlib_buffer_get_tail (b) - (u8 *) h;
  return h;
}

void *
lisp_msg_put_mreq (lisp_cp_main_t * lcm, vlib_buffer_t * b,
		   gid_address_t * seid, gid_address_t * deid,
		   gid_address_t * rlocs, u8 is_smr_invoked,
		   u8 rloc_probe_set, u64 * nonce)
{
  u8 loc_count = 0;

  /* Basic header init */
  map_request_hdr_t *h = vlib_buffer_put_uninit (b, sizeof (h[0]));

  memset (h, 0, sizeof (h[0]));
  MREQ_TYPE (h) = LISP_MAP_REQUEST;
  MREQ_NONCE (h) = nonce_build (0);
  MREQ_SMR_INVOKED (h) = is_smr_invoked ? 1 : 0;
  MREQ_RLOC_PROBE (h) = rloc_probe_set ? 1 : 0;

  /* We're adding one eid record */
  increment_record_count (h);

  /* Fill source eid */
  lisp_msg_put_gid (b, seid);

  /* Put itr rlocs */
  lisp_msg_put_itr_rlocs (lcm, b, rlocs, &loc_count);
  MREQ_ITR_RLOC_COUNT (h) = loc_count;

  /* Put eid record */
  lisp_msg_put_eid_rec (b, deid);

  nonce[0] = MREQ_NONCE (h);
  return h;
}

void *
lisp_msg_push_ecm (vlib_main_t * vm, vlib_buffer_t * b, int lp, int rp,
		   gid_address_t * la, gid_address_t * ra)
{
  ecm_hdr_t *h;
  ip_address_t _src_ip, *src_ip = &_src_ip, _dst_ip, *dst_ip = &_dst_ip;
  if (gid_address_type (la) != GID_ADDR_IP_PREFIX)
    {
      /* empty ip4 */
      memset (src_ip, 0, sizeof (src_ip[0]));
      memset (dst_ip, 0, sizeof (dst_ip[0]));
    }
  else
    {
      src_ip = &gid_address_ip (la);
      dst_ip = &gid_address_ip (ra);
    }

  /* Push inner ip and udp */
  pkt_push_udp_and_ip (vm, b, lp, rp, src_ip, dst_ip);

  /* Push lisp ecm hdr */
  h = pkt_push_ecm_hdr (b);

  return h;
}

static u32
msg_type_to_hdr_len (lisp_msg_type_e type)
{
  switch (type)
    {
    case LISP_MAP_REQUEST:
      return (sizeof (map_request_hdr_t));
    case LISP_MAP_REPLY:
      return (sizeof (map_reply_hdr_t));
    default:
      return (0);
    }
}

void *
lisp_msg_pull_hdr (vlib_buffer_t * b, lisp_msg_type_e type)
{
  return vlib_buffer_pull (b, msg_type_to_hdr_len (type));
}

u32
lisp_msg_parse_addr (vlib_buffer_t * b, gid_address_t * eid)
{
  u32 len;
  memset (eid, 0, sizeof (*eid));
  len = gid_address_parse (vlib_buffer_get_current (b), eid);
  if (len != ~0)
    vlib_buffer_pull (b, len);
  return len;
}

u32
lisp_msg_parse_eid_rec (vlib_buffer_t * b, gid_address_t * eid)
{
  eid_record_hdr_t *h = vlib_buffer_get_current (b);
  u32 len;
  memset (eid, 0, sizeof (*eid));
  len = gid_address_parse (EID_REC_ADDR (h), eid);
  if (len == ~0)
    return len;

  gid_address_ippref_len (eid) = EID_REC_MLEN (h);
  vlib_buffer_pull (b, len + sizeof (eid_record_hdr_t));

  return len + sizeof (eid_record_hdr_t);
}

u32
lisp_msg_parse_itr_rlocs (vlib_buffer_t * b, gid_address_t ** rlocs,
			  u8 rloc_count)
{
  gid_address_t tloc;
  u32 i, len = 0, tlen = 0;

  //MREQ_ITR_RLOC_COUNT(mreq_hdr) + 1
  for (i = 0; i < rloc_count; i++)
    {
      len = lisp_msg_parse_addr (b, &tloc);
      if (len == ~0)
	return len;
      vec_add1 (*rlocs, tloc);
      tlen += len;
    }
  return tlen;
}

u32
lisp_msg_parse_loc (vlib_buffer_t * b, locator_t * loc)
{
  int len;

  len = locator_parse (vlib_buffer_get_current (b), loc);
  if (len == ~0)
    return ~0;

  if (!vlib_buffer_has_space (b, sizeof (len)))
    return ~0;
  vlib_buffer_pull (b, len);

  return len;
}

u32
lisp_msg_parse_mapping_record (vlib_buffer_t * b, gid_address_t * eid,
			       locator_t ** locs, locator_t * probed_)
{
  void *h = 0, *loc_hdr = 0;
  locator_t loc, *probed = 0;
  int i = 0, len = 0, llen = 0;

  h = vlib_buffer_get_current (b);
  if (!vlib_buffer_has_space (b, sizeof (mapping_record_hdr_t)))
    return ~0;

  vlib_buffer_pull (b, sizeof (mapping_record_hdr_t));

  memset (eid, 0, sizeof (*eid));
  len = gid_address_parse (vlib_buffer_get_current (b), eid);
  if (len == ~0)
    return len;

  if (!vlib_buffer_has_space (b, sizeof (len)))
    return ~0;

  vlib_buffer_pull (b, len);
  if (GID_ADDR_IP_PREFIX == gid_address_type (eid))
    gid_address_ippref_len (eid) = MAP_REC_EID_PLEN (h);

  for (i = 0; i < MAP_REC_LOC_COUNT (h); i++)
    {
      loc_hdr = vlib_buffer_get_current (b);

      llen = lisp_msg_parse_loc (b, &loc);
      if (llen == ~0)
	return llen;
      vec_add1 (*locs, loc);
      len += llen;

      if (LOC_PROBED (loc_hdr))
	{
	  if (probed != 0)
	    clib_warning
	      ("Multiple locators probed! Probing only the first!");
	  else
	    probed = &loc;
	}
    }
  /* XXX */
  if (probed_ != 0 && probed)
    *probed_ = *probed;

  return len + sizeof (map_reply_hdr_t);
}

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