aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/ipip/sixrd.c
blob: 08fd604709a26189afc169584cf209387121ad48 (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
/*
 * sixrd.c - 6RD specific functions (RFC5969)
 *
 * Copyright (c) 2018 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 code supports the following sixrd modes:
 *
 * 32 EA bits (Complete IPv4 address is embedded):
 *   ea_bits_len = 32
 * IPv4 suffix is embedded:
 *   ea_bits_len = < 32
 * No embedded address bits (1:1 mode):
 *   ea_bits_len = 0
 */

#include "ipip.h"
#include <vlibapi/api.h>
#include <vlibmemory/api.h>
#include <vnet/adj/adj.h>
#include <vnet/adj/adj_delegate.h>
#include <vnet/adj/adj_midchain.h>
#include <vnet/dpo/lookup_dpo.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/plugin/plugin.h>

extern vlib_node_registration_t ip4_sixrd_node;

/**
 * Adj delegate data
 */
typedef struct sixrd_adj_delegate_t_
{
  u32 adj_index;
  fib_node_t sixrd_node;
  fib_node_index_t sixrd_fib_entry_index;
  u32 sixrd_sibling;
} sixrd_adj_delegate_t;

/**
 * Pool of delegate structs
 */
static sixrd_adj_delegate_t *sixrd_adj_delegate_pool;

/**
 * Adj delegate registered type
 */
static adj_delegate_type_t sixrd_adj_delegate_type;

/**
 * FIB node registered type
 */
static fib_node_type_t sixrd_fib_node_type;

static inline sixrd_adj_delegate_t *
sixrd_adj_from_base (adj_delegate_t * ad)
{
  if (ad == NULL)
    return (NULL);
  return (pool_elt_at_index (sixrd_adj_delegate_pool, ad->ad_index));
}

static inline const sixrd_adj_delegate_t *
sixrd_adj_from_const_base (const adj_delegate_t * ad)
{
  if (ad == NULL)
    {
      return (NULL);
    }
  return (pool_elt_at_index (sixrd_adj_delegate_pool, ad->ad_index));
}

static void
sixrd_fixup (vlib_main_t * vm, ip_adjacency_t * adj, vlib_buffer_t * b0,
	     const void *data)
{
  ip4_header_t *ip4 = vlib_buffer_get_current (b0);
  ip6_header_t *ip6 = vlib_buffer_get_current (b0) + sizeof (ip4_header_t);
  const ipip_tunnel_t *t = data;

  ip4->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
  ip4->dst_address.as_u32 =
    sixrd_get_addr_net (t, ip6->dst_address.as_u64[0]);
  ip4->checksum = ip4_header_checksum (ip4);
}

static void
ip6ip_fixup (vlib_main_t * vm, ip_adjacency_t * adj, vlib_buffer_t * b0,
	     const void *data)
{
  const ipip_tunnel_t *t = data;
  ip4_header_t *ip4 = vlib_buffer_get_current (b0);
  ip4->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
  ip4->dst_address.as_u32 =
    sixrd_get_addr_net (t, adj->sub_type.nbr.next_hop.as_u64[0]);
  ip4->checksum = ip4_header_checksum (ip4);
}

static u8 *
sixrd_build_rewrite (vnet_main_t * vnm, u32 sw_if_index,
		     vnet_link_t link_type, const void *dst_address)
{
  u8 *rewrite = NULL;
  ipip_tunnel_t *t;

  t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
  if (!t)
    return 0;

  vec_validate (rewrite, sizeof (ip4_header_t) - 1);
  ip4_header_t *ip4 = (ip4_header_t *) rewrite;
  ip4->ip_version_and_header_length = 0x45;
  ip4->ttl = 64;
  ip4->protocol = IP_PROTOCOL_IPV6;
  /* fixup ip4 header length and checksum after-the-fact */
  ip4->src_address.as_u32 = t->tunnel_src.ip4.as_u32;
  ip4->dst_address.as_u32 = 0;
  ip4->checksum = ip4_header_checksum (ip4);

  return rewrite;
}

static void
ip6ip_tunnel_stack (adj_index_t ai, u32 fib_entry_index)
{
  ip_adjacency_t *adj = adj_get (ai);
  ipip_tunnel_t *t;
  u32 sw_if_index = adj->rewrite_header.sw_if_index;

  t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
  if (!t)
    return;

  /*
   * find the adjacency that is contributed by the FIB entry
   * that this tunnel resolves via, and use it as the next adj
   * in the midchain
   */
  if (vnet_hw_interface_get_flags (vnet_get_main (), t->hw_if_index) &
      VNET_HW_INTERFACE_FLAG_LINK_UP)
    {
      adj_nbr_midchain_stack (ai,
			      fib_entry_contribute_ip_forwarding
			      (fib_entry_index));
    }
  else
    {
      adj_nbr_midchain_unstack (ai);
    }
}

static void
sixrd_tunnel_stack (adj_index_t ai, u32 fib_index)
{
  dpo_id_t dpo = DPO_INVALID;
  ip_adjacency_t *adj = adj_get (ai);
  u32 sw_if_index = adj->rewrite_header.sw_if_index;

  ipip_tunnel_t *t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);
  if (!t)
    return;

  lookup_dpo_add_or_lock_w_fib_index (fib_index, DPO_PROTO_IP4,
				      LOOKUP_UNICAST, LOOKUP_INPUT_DST_ADDR,
				      LOOKUP_TABLE_FROM_CONFIG, &dpo);
  adj_nbr_midchain_stack (ai, &dpo);
}

const static ip46_address_t sixrd_special_nh = {
  .ip6 = {
	  .as_u64 = {
		     [0] = 0xffffffffffffffff,
		     [1] = 0xffffffffffffffff,
		     },
	  },
};

static void
sixrd_update_adj (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
{
  ip_adjacency_t *adj = adj_get (ai);
  ipip_tunnel_t *t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);

  /* Not our tunnel */
  if (!t)
    return;
  if (!memcmp (&sixrd_special_nh, &adj->sub_type.nbr.next_hop,
	       sizeof (sixrd_special_nh)))
    {
      adj_nbr_midchain_update_rewrite (ai, sixrd_fixup, t, ADJ_FLAG_NONE,
				       sixrd_build_rewrite (vnm, sw_if_index,
							    adj_get_link_type
							    (ai), NULL));
      sixrd_tunnel_stack (ai, t->fib_index);
    }
  else
    {
      sixrd_adj_delegate_t *sixrd_ad;
      ip4_address_t da4;

      da4.as_u32 =
	sixrd_get_addr_net (t, adj->sub_type.nbr.next_hop.as_u64[0]);

      fib_prefix_t pfx = {
	.fp_proto = FIB_PROTOCOL_IP4,
	.fp_len = 32,
	.fp_addr = {
		    .ip4 = da4,
		    }
	,
      };

      adj_nbr_midchain_update_rewrite (ai, ip6ip_fixup, t, ADJ_FLAG_NONE,
				       sixrd_build_rewrite (vnm, sw_if_index,
							    adj_get_link_type
							    (ai), NULL));

      sixrd_ad =
	sixrd_adj_from_base (adj_delegate_get (adj, sixrd_adj_delegate_type));
      if (sixrd_ad == NULL)
	{
	  pool_get (sixrd_adj_delegate_pool, sixrd_ad);
	  fib_node_init (&sixrd_ad->sixrd_node, sixrd_fib_node_type);
	  sixrd_ad->adj_index = ai;
	  sixrd_ad->sixrd_fib_entry_index =
	    fib_table_entry_special_add (t->fib_index, &pfx, FIB_SOURCE_RR,
					 FIB_ENTRY_FLAG_NONE);
	  sixrd_ad->sixrd_sibling =
	    fib_entry_child_add (sixrd_ad->sixrd_fib_entry_index,
				 sixrd_fib_node_type,
				 sixrd_ad - sixrd_adj_delegate_pool);

	  adj_delegate_add (adj, sixrd_adj_delegate_type,
			    sixrd_ad - sixrd_adj_delegate_pool);

	  ip6ip_tunnel_stack (ai, sixrd_ad->sixrd_fib_entry_index);
	}
    }
}

clib_error_t *
sixrd_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
{
  /* Always up */
  vnet_hw_interface_set_flags (vnm, hw_if_index,
			       VNET_HW_INTERFACE_FLAG_LINK_UP);
  return /* no error */ 0;
}

/* *INDENT-OFF* */
VNET_HW_INTERFACE_CLASS(sixrd_hw_interface_class) = {
    .name = "ip6ip-6rd",
    .build_rewrite = sixrd_build_rewrite,
    .update_adjacency = sixrd_update_adj,
};

VNET_DEVICE_CLASS(sixrd_device_class) = {
    .name = "ip6ip-6rd",
    .admin_up_down_function = sixrd_interface_admin_up_down,
#ifdef SOON
    .clear counter = 0;
#endif
}
;
/* *INDENT-ON* */

int
sixrd_add_tunnel (ip6_address_t * ip6_prefix, u8 ip6_prefix_len,
		  ip4_address_t * ip4_prefix, u8 ip4_prefix_len,
		  ip4_address_t * ip4_src, bool security_check,
		  u32 fib_index, u32 * sw_if_index)
{
  ipip_main_t *gm = &ipip_main;
  ipip_tunnel_t *t;

  if (fib_index == ~0)
    return VNET_API_ERROR_NO_SUCH_FIB;

  if ((ip6_prefix_len + 32 - ip4_prefix_len) > 64)
    return VNET_API_ERROR_INVALID_VALUE;

  /* Tunnel already configured */
  ip46_address_t src = ip46_address_initializer, dst =
    ip46_address_initializer;
  ip_set (&src, ip4_src, true);
  ipip_tunnel_key_t key = {.transport = IPIP_TRANSPORT_IP4,
    .fib_index = fib_index,
    .src = src,
    .dst = dst
  };

  t = ipip_tunnel_db_find (&key);
  if (t)
    return VNET_API_ERROR_IF_ALREADY_EXISTS;

  /* Get tunnel index */
  pool_get_aligned (gm->tunnels, t, CLIB_CACHE_LINE_BYTES);
  memset (t, 0, sizeof (*t));
  u32 t_idx = t - gm->tunnels;	/* tunnel index (or instance) */

  /* Init tunnel struct */
  t->mode = IPIP_MODE_6RD;
  t->sixrd.ip4_prefix.as_u32 = ip4_prefix->as_u32;
  t->sixrd.ip4_prefix_len = ip4_prefix_len;
  t->sixrd.ip6_prefix = *ip6_prefix;
  t->sixrd.ip6_prefix_len = ip6_prefix_len;
  t->tunnel_src = src;
  t->sixrd.security_check = security_check;
  t->sixrd.shift =
    (ip4_prefix_len < 32) ? 64 - ip6_prefix_len - (32 - ip4_prefix_len) : 0;

  /* Create interface */
  u32 hw_if_index =
    vnet_register_interface (vnet_get_main (), sixrd_device_class.index,
			     t_idx,
			     sixrd_hw_interface_class.index, t_idx);

  /* Default the interface to up and enable IPv6 (payload) */
  vnet_hw_interface_t *hi =
    vnet_get_hw_interface (vnet_get_main (), hw_if_index);
  t->hw_if_index = hw_if_index;
  t->fib_index = fib_index;
  t->sw_if_index = hi->sw_if_index;
  t->dev_instance = t_idx;
  t->user_instance = t_idx;

  hi->max_l3_packet_bytes[VLIB_RX] = hi->max_l3_packet_bytes[VLIB_TX] = 1480;

  ipip_tunnel_db_add (t, &key);

  vec_validate_init_empty (gm->tunnel_index_by_sw_if_index, hi->sw_if_index,
			   ~0);
  gm->tunnel_index_by_sw_if_index[hi->sw_if_index] = t_idx;

  vnet_hw_interface_set_flags (vnet_get_main (), hw_if_index,
			       VNET_HW_INTERFACE_FLAG_LINK_UP);
  vnet_sw_interface_set_flags (vnet_get_main (), hi->sw_if_index,
			       VNET_SW_INTERFACE_FLAG_ADMIN_UP);
  ip6_sw_interface_enable_disable (hi->sw_if_index, true);

  /* Create IPv6 route/adjacency */
  fib_prefix_t pfx6 = {
    .fp_proto = FIB_PROTOCOL_IP6,
    .fp_len = t->sixrd.ip6_prefix_len,
    .fp_addr = {
		.ip6 = t->sixrd.ip6_prefix,
		}
    ,
  };

  fib_table_entry_update_one_path (fib_index, &pfx6, FIB_SOURCE_CLI,
				   FIB_ENTRY_FLAG_ATTACHED, DPO_PROTO_IP6,
				   &sixrd_special_nh, hi->sw_if_index, ~0, 1,
				   NULL, FIB_ROUTE_PATH_FLAG_NONE);

  *sw_if_index = hi->sw_if_index;

  if (!gm->ip4_protocol_registered)
    {
      vlib_node_t *ipip4_input =
	vlib_get_node_by_name (gm->vlib_main, (u8 *) "ipip4-input");
      ASSERT (ipip4_input);
      ip4_register_protocol (IP_PROTOCOL_IPV6, ipip4_input->index);
    }
  return 0;
}

/*
 * sixrd_del_tunnel
 */
int
sixrd_del_tunnel (u32 sw_if_index)
{
  ipip_main_t *gm = &ipip_main;
  ipip_tunnel_t *t = ipip_tunnel_db_find_by_sw_if_index (sw_if_index);

  if (!t)
    {
      clib_warning ("SIXRD tunnel delete: tunnel does not exist: %d",
		    sw_if_index);
      return -1;
    }

  fib_prefix_t pfx6 = {
    .fp_proto = FIB_PROTOCOL_IP6,
    .fp_len = t->sixrd.ip6_prefix_len,
    .fp_addr = {
		.ip6 = t->sixrd.ip6_prefix,
		}
    ,
  };
  fib_table_entry_special_remove (0, &pfx6, FIB_SOURCE_CLI);
  vnet_sw_interface_set_flags (vnet_get_main (), t->sw_if_index,
			       0 /* down */ );
  ip6_sw_interface_enable_disable (t->sw_if_index, false);
  gm->tunnel_index_by_sw_if_index[t->sw_if_index] = ~0;

  vnet_delete_hw_interface (vnet_get_main (), t->hw_if_index);
  ipip_tunnel_db_remove (t);
  pool_put (gm->tunnels, t);

  return 0;
}

static void
sixrd_adj_delegate_adj_deleted (adj_delegate_t * aed)
{
  sixrd_adj_delegate_t *sixrd_ad;

  sixrd_ad = sixrd_adj_from_base (aed);
  fib_entry_child_remove (sixrd_ad->sixrd_fib_entry_index,
			  sixrd_ad->sixrd_sibling);
  fib_table_entry_delete_index (sixrd_ad->sixrd_fib_entry_index,
				FIB_SOURCE_RR);
  pool_put (sixrd_adj_delegate_pool, sixrd_ad);
}

static u8 *
sixrd_adj_delegate_format (const adj_delegate_t * aed, u8 * s)
{
  const sixrd_adj_delegate_t *sixrd_ad;

  sixrd_ad = sixrd_adj_from_const_base (aed);
  s = format (s, "SIXRD:[fib-entry:%d]", sixrd_ad->sixrd_fib_entry_index);

  return (s);
}

static void
sixrd_fib_node_last_lock_gone (fib_node_t * node)
{
  /* top of the dependency tree, locks not managed here. */
}

static sixrd_adj_delegate_t *
sixrd_adj_delegate_from_fib_node (fib_node_t * node)
{
  return ((sixrd_adj_delegate_t *) (((char *) node) -
				    STRUCT_OFFSET_OF (sixrd_adj_delegate_t,
						      sixrd_node)));
}

static fib_node_back_walk_rc_t
sixrd_fib_node_back_walk_notify (fib_node_t * node,
				 fib_node_back_walk_ctx_t * ctx)
{
  sixrd_adj_delegate_t *sixrd_ad;

  sixrd_ad = sixrd_adj_delegate_from_fib_node (node);
  ip6ip_tunnel_stack (sixrd_ad->adj_index, sixrd_ad->sixrd_fib_entry_index);

  return (FIB_NODE_BACK_WALK_CONTINUE);
}

/**
 * Function definition to get a FIB node from its index
 */
static fib_node_t *
sixrd_fib_node_get (fib_node_index_t index)
{
  sixrd_adj_delegate_t *sixrd_ad;

  sixrd_ad = pool_elt_at_index (sixrd_adj_delegate_pool, index);

  return (&sixrd_ad->sixrd_node);
}

/**
 * VFT registered with the adjacency delegate
 */
const static adj_delegate_vft_t sixrd_adj_delegate_vft = {
  .adv_adj_deleted = sixrd_adj_delegate_adj_deleted,
  .adv_format = sixrd_adj_delegate_format,
};

/**
 * VFT registered with the FIB node for the adj delegate
 */
const static fib_node_vft_t sixrd_fib_node_vft = {
  .fnv_get = sixrd_fib_node_get,
  .fnv_last_lock = sixrd_fib_node_last_lock_gone,
  .fnv_back_walk = sixrd_fib_node_back_walk_notify,
};

static clib_error_t *
sixrd_init (vlib_main_t * vm)
{
  clib_error_t *error = 0;

  /* Make sure the IPIP tunnel subsystem is initialised */
  vlib_call_init_function (vm, ipip_init);

  sixrd_adj_delegate_type =
    adj_delegate_register_new_type (&sixrd_adj_delegate_vft);
  sixrd_fib_node_type = fib_node_register_new_type (&sixrd_fib_node_vft);

  return error;
}

VLIB_INIT_FUNCTION (sixrd_init);

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