aboutsummaryrefslogtreecommitdiffstats
path: root/src/plugins/srv6-as/as.c
blob: d9dbd8aa6081531849e11b09897cc3988111db9c (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
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
/*
 * Copyright (c) 2015 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.
 */
/*
 *------------------------------------------------------------------
 * as.c - SRv6 Static Proxy (AS) function
 *------------------------------------------------------------------
 */

#include <vnet/vnet.h>
#include <vnet/adj/adj.h>
#include <vnet/plugin/plugin.h>
#include <vpp/app/version.h>
#include <srv6-as/as.h>

#define SID_CREATE_IFACE_FEATURE_ERROR  -1
#define SID_CREATE_INVALID_IFACE_TYPE   -3
#define SID_CREATE_INVALID_IFACE_INDEX  -4
#define SID_CREATE_INVALID_ADJ_INDEX    -5

unsigned char function_name[] = "SRv6-AS-plugin";
unsigned char keyword_str[] = "End.AS";
unsigned char def_str[] =
  "Endpoint with static proxy to SR-unaware appliance";
unsigned char params_str[] =
  "nh <next-hop> oif <iface-out> iif <iface-in> src <src-addr> next <sid> [next <sid> ...]";

srv6_as_main_t srv6_as_main;

static inline u8 *
prepare_rewrite (ip6_address_t src_addr, ip6_address_t * sid_list,
		 u8 protocol)
{
  u8 *rewrite_str = NULL;
  u32 rewrite_len = IPv6_DEFAULT_HEADER_LENGTH;

  u8 num_sids = vec_len (sid_list);
  u32 sr_hdr_len = 0;

  if (num_sids > 1)
    {
      sr_hdr_len =
	sizeof (ip6_sr_header_t) + num_sids * sizeof (ip6_address_t);
      rewrite_len += sr_hdr_len;
    }

  vec_validate (rewrite_str, rewrite_len - 1);

  /* Fill IP header */
  ip6_header_t *iph = (ip6_header_t *) rewrite_str;
  iph->ip_version_traffic_class_and_flow_label =
    clib_host_to_net_u32 (0 | ((6 & 0xF) << 28));
  iph->src_address = src_addr;
  iph->dst_address = sid_list[0];
  iph->payload_length = sr_hdr_len;
  iph->hop_limit = sr_get_hop_limit ();

  if (num_sids > 1)
    {
      /* Set Next Header value to Routing Extension */
      iph->protocol = IP_PROTOCOL_IPV6_ROUTE;

      /* Fill SR header */
      ip6_sr_header_t *srh = (ip6_sr_header_t *) (iph + 1);
      srh->protocol = protocol;
      srh->length = sr_hdr_len / 8 - 1;
      srh->type = ROUTING_HEADER_TYPE_SR;
      srh->segments_left = num_sids - 1;
      srh->last_entry = num_sids - 1;
      srh->flags = 0x00;
      srh->tag = 0x0000;

      /* Fill segment list */
      ip6_address_t *this_address;
      ip6_address_t *addrp = srh->segments + srh->last_entry;
      vec_foreach (this_address, sid_list)
      {
	*addrp = *this_address;
	addrp--;
      }
    }
  else
    {
      /* Set Next Header value to inner protocol */
      iph->protocol = protocol;
    }

  return rewrite_str;
}

static inline void
free_ls_mem (srv6_as_localsid_t * ls_mem)
{
  vec_free (ls_mem->rewrite);
  vec_free (ls_mem->sid_list);
  clib_mem_free (ls_mem);
}


/*****************************************/
/* SRv6 LocalSID instantiation and removal functions */
static int
srv6_as_localsid_creation_fn (ip6_sr_localsid_t * localsid)
{
  ip6_sr_main_t *srm = &sr_main;
  srv6_as_main_t *sm = &srv6_as_main;
  srv6_as_localsid_t *ls_mem = localsid->plugin_mem;
  u32 localsid_index = localsid - srm->localsids;

  /* Step 1: Prepare xconnect adjacency for sending packets to the VNF */

  /* Retrieve the adjacency corresponding to the (OIF, next_hop) */
  adj_index_t nh_adj_index = ADJ_INDEX_INVALID;
  if (ls_mem->inner_type != AS_TYPE_L2)
    {
      if (ls_mem->inner_type == AS_TYPE_IP4)
	nh_adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
					    VNET_LINK_IP4, &ls_mem->nh_addr,
					    ls_mem->sw_if_index_out);
      else if (ls_mem->inner_type == AS_TYPE_IP6)
	nh_adj_index = adj_nbr_add_or_lock (FIB_PROTOCOL_IP6,
					    VNET_LINK_IP6, &ls_mem->nh_addr,
					    ls_mem->sw_if_index_out);
      if (nh_adj_index == ADJ_INDEX_INVALID)
	{
	  free_ls_mem (ls_mem);
	  return SID_CREATE_INVALID_ADJ_INDEX;
	}
    }

  ls_mem->nh_adj = nh_adj_index;


  /* Step 2: Prepare inbound policy for packets returning from the VNF */

  /* Make sure the provided incoming interface index is valid */
  if (pool_is_free_index (sm->vnet_main->interface_main.sw_interfaces,
			  ls_mem->sw_if_index_in))
    {
      adj_unlock (ls_mem->nh_adj);
      free_ls_mem (ls_mem);
      return SID_CREATE_INVALID_IFACE_INDEX;
    }

  /* Retrieve associated interface structure */
  vnet_sw_interface_t *sw = vnet_get_sw_interface (sm->vnet_main,
						   ls_mem->sw_if_index_in);
  if (sw->type != VNET_SW_INTERFACE_TYPE_HARDWARE)
    {
      adj_unlock (ls_mem->nh_adj);
      free_ls_mem (ls_mem);
      return SID_CREATE_INVALID_IFACE_TYPE;
    }

  if (ls_mem->inner_type == AS_TYPE_L2)
    {
      /* Enable End.AS2 rewrite node for this interface */
      int ret =
	vnet_feature_enable_disable ("device-input", "srv6-as2-rewrite",
				     ls_mem->sw_if_index_in, 1, 0, 0);
      if (ret != 0)
	{
	  free_ls_mem (ls_mem);
	  return SID_CREATE_IFACE_FEATURE_ERROR;
	}

      /* Set interface in promiscuous mode */
      vnet_main_t *vnm = vnet_get_main ();
      vnet_hw_interface_t *hi =
	vnet_get_sup_hw_interface (vnm, ls_mem->sw_if_index_in);
      /* Make sure it is main interface */
      if (hi->sw_if_index == ls_mem->sw_if_index_in)
	ethernet_set_flags (vnm, hi->hw_if_index,
			    ETHERNET_INTERFACE_FLAG_ACCEPT_ALL);

      /* Prepare rewrite string */
      ls_mem->rewrite = prepare_rewrite (ls_mem->src_addr, ls_mem->sid_list,
					 IP_PROTOCOL_IP6_ETHERNET);

      /* Associate local SID index to this interface (resize vector if needed) */
      if (ls_mem->sw_if_index_in >= vec_len (sm->sw_iface_localsid2))
	{
	  vec_resize (sm->sw_iface_localsid2,
		      (pool_len (sm->vnet_main->interface_main.sw_interfaces)
		       - vec_len (sm->sw_iface_localsid2)));
	}
      sm->sw_iface_localsid2[ls_mem->sw_if_index_in] = localsid_index;
    }
  else if (ls_mem->inner_type == AS_TYPE_IP4)
    {
      /* Enable End.AS4 rewrite node for this interface */
      int ret =
	vnet_feature_enable_disable ("ip4-unicast", "srv6-as4-rewrite",
				     ls_mem->sw_if_index_in, 1, 0, 0);
      if (ret != 0)
	{
	  adj_unlock (ls_mem->nh_adj);
	  free_ls_mem (ls_mem);
	  return SID_CREATE_IFACE_FEATURE_ERROR;
	}

      /* Prepare rewrite string */
      ls_mem->rewrite = prepare_rewrite (ls_mem->src_addr, ls_mem->sid_list,
					 IP_PROTOCOL_IP_IN_IP);

      /* Associate local SID index to this interface (resize vector if needed) */
      if (ls_mem->sw_if_index_in >= vec_len (sm->sw_iface_localsid4))
	{
	  vec_resize (sm->sw_iface_localsid4,
		      (pool_len (sm->vnet_main->interface_main.sw_interfaces)
		       - vec_len (sm->sw_iface_localsid4)));
	}
      sm->sw_iface_localsid4[ls_mem->sw_if_index_in] = localsid_index;
    }
  else if (ls_mem->inner_type == AS_TYPE_IP6)
    {
      /* Enable End.AS6 rewrite node for this interface */
      int ret =
	vnet_feature_enable_disable ("ip6-unicast", "srv6-as6-rewrite",
				     ls_mem->sw_if_index_in, 1, 0, 0);
      if (ret != 0)
	{
	  adj_unlock (ls_mem->nh_adj);
	  free_ls_mem (ls_mem);
	  return SID_CREATE_IFACE_FEATURE_ERROR;
	}

      /* Prepare rewrite string */
      ls_mem->rewrite = prepare_rewrite (ls_mem->src_addr, ls_mem->sid_list,
					 IP_PROTOCOL_IPV6);

      /* Associate local SID index to this interface (resize vector if needed) */
      if (ls_mem->sw_if_index_in >= vec_len (sm->sw_iface_localsid6))
	{
	  vec_resize (sm->sw_iface_localsid6,
		      (pool_len (sm->vnet_main->interface_main.sw_interfaces)
		       - vec_len (sm->sw_iface_localsid6)));
	}
      sm->sw_iface_localsid6[ls_mem->sw_if_index_in] = localsid_index;
    }

  /* Step 3: Initialize rewrite counters */
  srv6_as_localsid_t **ls_p;
  pool_get (sm->sids, ls_p);
  *ls_p = ls_mem;
  ls_mem->index = ls_p - sm->sids;

  vlib_validate_combined_counter (&(sm->valid_counters), ls_mem->index);
  vlib_validate_combined_counter (&(sm->invalid_counters), ls_mem->index);

  vlib_zero_combined_counter (&(sm->valid_counters), ls_mem->index);
  vlib_zero_combined_counter (&(sm->invalid_counters), ls_mem->index);

  return 0;
}

static int
srv6_as_localsid_removal_fn (ip6_sr_localsid_t * localsid)
{
  srv6_as_main_t *sm = &srv6_as_main;
  srv6_as_localsid_t *ls_mem = localsid->plugin_mem;

  if (ls_mem->inner_type == AS_TYPE_L2)
    {
      /* Disable End.AS2 rewrite node for this interface */
      int ret;
      ret = vnet_feature_enable_disable ("device-input", "srv6-as2-rewrite",
					 ls_mem->sw_if_index_in, 0, 0, 0);
      if (ret != 0)
	return -1;

      /* Disable promiscuous mode on the interface */
      vnet_main_t *vnm = vnet_get_main ();
      vnet_hw_interface_t *hi =
	vnet_get_sup_hw_interface (vnm, ls_mem->sw_if_index_in);
      /* Make sure it is main interface */
      if (hi->sw_if_index == ls_mem->sw_if_index_in)
	ethernet_set_flags (vnm, hi->hw_if_index, 0);

      /* Remove local SID index from interface table */
      sm->sw_iface_localsid2[ls_mem->sw_if_index_in] = ~(u32) 0;
    }
  else if (ls_mem->inner_type == AS_TYPE_IP4)
    {
      /* Disable End.AS4 rewrite node for this interface */
      int ret;
      ret = vnet_feature_enable_disable ("ip4-unicast", "srv6-as4-rewrite",
					 ls_mem->sw_if_index_in, 0, 0, 0);
      if (ret != 0)
	return -1;

      /* Remove local SID index from interface table */
      sm->sw_iface_localsid4[ls_mem->sw_if_index_in] = ~(u32) 0;
    }
  else if (ls_mem->inner_type == AS_TYPE_IP6)
    {
      /* Disable End.AS6 rewrite node for this interface */
      int ret;
      ret = vnet_feature_enable_disable ("ip6-unicast", "srv6-as6-rewrite",
					 ls_mem->sw_if_index_in, 0, 0, 0);
      if (ret != 0)
	return -1;

      /* Remove local SID index from interface table */
      sm->sw_iface_localsid6[ls_mem->sw_if_index_in] = ~(u32) 0;
    }


  /* Unlock (OIF, NHOP) adjacency (from sr_localsid.c:103) */
  adj_unlock (ls_mem->nh_adj);

  /* Delete SID entry */
  pool_put (sm->sids, pool_elt_at_index (sm->sids, ls_mem->index));

  /* Clean up local SID memory */
  free_ls_mem (ls_mem);

  return 0;
}

/**********************************/
/* SRv6 LocalSID format functions */
/*
 * Prints nicely the parameters of a localsid
 * Example: print "Table 5"
 */
u8 *
format_srv6_as_localsid (u8 * s, va_list * args)
{
  srv6_as_localsid_t *ls_mem = va_arg (*args, void *);

  vnet_main_t *vnm = vnet_get_main ();
  srv6_as_main_t *sm = &srv6_as_main;

  if (ls_mem->inner_type == AS_TYPE_IP4)
    {
      s =
	format (s, "Next-hop:\t%U\n\t", format_ip4_address,
		&ls_mem->nh_addr.ip4);
    }
  else if (ls_mem->inner_type == AS_TYPE_IP6)
    {
      s =
	format (s, "Next-hop:\t%U\n\t", format_ip6_address,
		&ls_mem->nh_addr.ip6);
    }

  s = format (s, "Outgoing iface:\t%U\n", format_vnet_sw_if_index_name, vnm,
	      ls_mem->sw_if_index_out);
  s = format (s, "\tIncoming iface:\t%U\n", format_vnet_sw_if_index_name, vnm,
	      ls_mem->sw_if_index_in);
  s = format (s, "\tSource address:\t%U\n", format_ip6_address,
	      &ls_mem->src_addr);

  s = format (s, "\tSegment list:\t< ");
  ip6_address_t *addr;
  vec_foreach (addr, ls_mem->sid_list)
  {
    s = format (s, "%U, ", format_ip6_address, addr);
  }
  s = format (s, "\b\b >\n");

  vlib_counter_t valid, invalid;
  vlib_get_combined_counter (&(sm->valid_counters), ls_mem->index, &valid);
  vlib_get_combined_counter (&(sm->invalid_counters), ls_mem->index,
			     &invalid);
  s =
    format (s, "\tGood rewrite traffic: \t[%Ld packets : %Ld bytes]\n",
	    valid.packets, valid.bytes);
  s =
    format (s, "\tBad rewrite traffic:  \t[%Ld packets : %Ld bytes]\n",
	    invalid.packets, invalid.bytes);

  return s;
}

/*
 * Process the parameters of a localsid
 * Example: process from:
 * sr localsid address cafe::1 behavior new_srv6_localsid 5
 * everything from behavior on... so in this case 'new_srv6_localsid 5'
 * Notice that it MUST match the keyword_str and params_str defined above.
 */
uword
unformat_srv6_as_localsid (unformat_input_t * input, va_list * args)
{
  void **plugin_mem_p = va_arg (*args, void **);
  srv6_as_localsid_t *ls_mem;

  vnet_main_t *vnm = vnet_get_main ();

  u8 inner_type = AS_TYPE_L2;
  ip46_address_t nh_addr;
  u32 sw_if_index_out;
  u32 sw_if_index_in;
  ip6_address_t src_addr;
  ip6_address_t next_sid;
  ip6_address_t *sid_list = NULL;

  u8 params = 0;
#define PARAM_AS_NH   (1 << 0)
#define PARAM_AS_OIF  (1 << 1)
#define PARAM_AS_IIF  (1 << 2)
#define PARAM_AS_SRC  (1 << 3)

  if (!unformat (input, "end.as"))
    return 0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (!(params & PARAM_AS_NH) && unformat (input, "nh %U",
					       unformat_ip4_address,
					       &nh_addr.ip4))
	{
	  inner_type = AS_TYPE_IP4;
	  params |= PARAM_AS_NH;
	}
      if (!(params & PARAM_AS_NH) && unformat (input, "nh %U",
					       unformat_ip6_address,
					       &nh_addr.ip6))
	{
	  inner_type = AS_TYPE_IP6;
	  params |= PARAM_AS_NH;
	}
      else if (!(params & PARAM_AS_OIF) && unformat (input, "oif %U",
						     unformat_vnet_sw_interface,
						     vnm, &sw_if_index_out))
	{
	  params |= PARAM_AS_OIF;
	}
      else if (!(params & PARAM_AS_IIF) && unformat (input, "iif %U",
						     unformat_vnet_sw_interface,
						     vnm, &sw_if_index_in))
	{
	  params |= PARAM_AS_IIF;
	}
      else if (!(params & PARAM_AS_SRC) && unformat (input, "src %U",
						     unformat_ip6_address,
						     &src_addr))
	{
	  params |= PARAM_AS_SRC;
	}
      else if (unformat (input, "next %U", unformat_ip6_address, &next_sid))
	{
	  vec_add1 (sid_list, next_sid);
	}
      else
	{
	  break;
	}
    }

  /* Make sure that all parameters are supplied */
  u8 params_chk = (PARAM_AS_OIF | PARAM_AS_IIF | PARAM_AS_SRC);
  if ((params & params_chk) != params_chk || sid_list == NULL)
    {
      vec_free (sid_list);
      return 0;
    }

  /* Allocate and initialize memory block for local SID parameters */
  ls_mem = clib_mem_alloc_aligned_at_offset (sizeof *ls_mem, 0, 0, 1);
  clib_memset (ls_mem, 0, sizeof *ls_mem);
  *plugin_mem_p = ls_mem;

  /* Set local SID parameters */
  ls_mem->inner_type = inner_type;
  if (inner_type == AS_TYPE_IP4)
    ls_mem->nh_addr.ip4 = nh_addr.ip4;
  else if (inner_type == AS_TYPE_IP6)
    ls_mem->nh_addr.ip6 = nh_addr.ip6;
  ls_mem->sw_if_index_out = sw_if_index_out;
  ls_mem->sw_if_index_in = sw_if_index_in;
  ls_mem->src_addr = src_addr;
  ls_mem->sid_list = sid_list;

  return 1;
}

/*************************/
/* SRv6 LocalSID FIB DPO */
static u8 *
format_srv6_as_dpo (u8 * s, va_list * args)
{
  index_t index = va_arg (*args, index_t);
  CLIB_UNUSED (u32 indent) = va_arg (*args, u32);

  return (format (s, "SR: static_proxy_index:[%u]", index));
}

void
srv6_as_dpo_lock (dpo_id_t * dpo)
{
}

void
srv6_as_dpo_unlock (dpo_id_t * dpo)
{
}

const static dpo_vft_t srv6_as_vft = {
  .dv_lock = srv6_as_dpo_lock,
  .dv_unlock = srv6_as_dpo_unlock,
  .dv_format = format_srv6_as_dpo,
};

const static char *const srv6_as_ip6_nodes[] = {
  "srv6-as-localsid",
  NULL,
};

const static char *const *const srv6_as_nodes[DPO_PROTO_NUM] = {
  [DPO_PROTO_IP6] = srv6_as_ip6_nodes,
};

/**********************/
static clib_error_t *
srv6_as_init (vlib_main_t * vm)
{
  srv6_as_main_t *sm = &srv6_as_main;
  int rv = 0;

  sm->vlib_main = vm;
  sm->vnet_main = vnet_get_main ();

  /* Create DPO */
  sm->srv6_as_dpo_type = dpo_register_new_type (&srv6_as_vft, srv6_as_nodes);

  /* Register SRv6 LocalSID */
  rv = sr_localsid_register_function (vm,
				      function_name,
				      keyword_str,
				      def_str,
				      params_str,
				      128,
				      &sm->srv6_as_dpo_type,
				      format_srv6_as_localsid,
				      unformat_srv6_as_localsid,
				      srv6_as_localsid_creation_fn,
				      srv6_as_localsid_removal_fn);
  if (rv < 0)
    clib_error_return (0, "SRv6 LocalSID function could not be registered.");
  else
    sm->srv6_localsid_behavior_id = rv;

  return 0;
}

/* *INDENT-OFF* */
VNET_FEATURE_INIT (srv6_as2_rewrite, static) =
{
  .arc_name = "device-input",
  .node_name = "srv6-as2-rewrite",
  .runs_before = VNET_FEATURES ("ethernet-input"),
};

VNET_FEATURE_INIT (srv6_as4_rewrite, static) =
{
  .arc_name = "ip4-unicast",
  .node_name = "srv6-as4-rewrite",
  .runs_before = 0,
};

VNET_FEATURE_INIT (srv6_as6_rewrite, static) =
{
  .arc_name = "ip6-unicast",
  .node_name = "srv6-as6-rewrite",
  .runs_before = 0,
};

VLIB_INIT_FUNCTION (srv6_as_init);

VLIB_PLUGIN_REGISTER () = {
  .version = VPP_BUILD_VER,
  .description = "Static Segment Routing for IPv6 (SRv6) Proxy",
};
/* *INDENT-ON* */

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