aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/ipsec-gre/ipsec_gre.c
blob: e4f5e8052894f70147e8794cddb360fae9868ddc (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
/*
 * 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.
 */
/**
 * @file
 * @brief L2-GRE over IPSec packet processing.
 *
 * Add GRE header to thr packet and send it to the esp-encrypt node.
*/

#include <vnet/vnet.h>
#include <vnet/ipsec-gre/ipsec_gre.h>

extern ipsec_gre_main_t ipsec_gre_main;

#ifndef CLIB_MARCH_VARIANT
ipsec_gre_main_t ipsec_gre_main;
#endif /* CLIB_MARCH_VARIANT */

/**
 * @brief IPv4 and GRE header union.
 *
*/
typedef struct
{
  union
  {
    ip4_and_gre_header_t ip4_and_gre;
    u64 as_u64[3];
  };
} ip4_and_gre_union_t;

/**
 * @brief Packet trace.
 *
*/
typedef struct
{
  u32 tunnel_id; /**< Tunnel-id / index in tunnel vector */

  u32 length; /**< pkt length */

  ip4_address_t src; /**< tunnel src IPv4 address */
  ip4_address_t dst; /**< tunnel dst IPv4 address */

  u32 sa_id; /**< tunnel IPSec SA id */
} ipsec_gre_tx_trace_t;

static u8 *
format_ipsec_gre_tx_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 *);
  ipsec_gre_tx_trace_t *t = va_arg (*args, ipsec_gre_tx_trace_t *);

  s = format (s, "GRE: tunnel %d len %d src %U dst %U sa-id %d",
	      t->tunnel_id, clib_net_to_host_u16 (t->length),
	      format_ip4_address, &t->src.as_u8,
	      format_ip4_address, &t->dst.as_u8, t->sa_id);
  return s;
}

/**
 * @brief IPSec-GRE tunnel interface tx function.
 *
 * Add GRE header to the packet.
 *
 * @param vm vlib_main_t corresponding to the current thread.
 * @param node vlib_node_runtime_t data for this node.
 * @param frame vlib_frame_t whose contents should be dispatched.
 *
 * @par Graph mechanics: buffer metadata, next index usage
 *
 * <em>Uses:</em>
 * - <code>node->runtime_data</code>
 *     - Match tunnel by <code>rd->dev_instance</code> in IPSec-GRE tunnels
 *       pool.
 *
 * <em>Sets:</em>
 * - <code>vnet_buffer(b)->output_features.ipsec_sad_index</code>
 *     - Set IPSec Security Association for packet encryption.
 * - <code>vnet_buffer(b)->sw_if_index[VLIB_TX]</code>
 *     - Reset output sw_if_index.
 *
 * <em>Next Index:</em>
 * - Dispatches the packet to the esp-encrypt node.
*/
VNET_DEVICE_CLASS_TX_FN (ipsec_gre_device_class) (vlib_main_t * vm,
						  vlib_node_runtime_t * node,
						  vlib_frame_t * frame)
{
  ipsec_gre_main_t *igm = &ipsec_gre_main;
  u32 next_index;
  u32 *from, *to_next, n_left_from, n_left_to_next;
  vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
  ipsec_gre_tunnel_t *t = pool_elt_at_index (igm->tunnels, rd->dev_instance);

  /* use an ethertype of 0x01 for l2-gre */
  u16 l2_gre_protocol_ethertype = clib_net_to_host_u16 (0x01);

  /* Vector of buffer / pkt indices we're supposed to process */
  from = vlib_frame_vector_args (frame);

  /* Number of buffers / pkts */
  n_left_from = frame->n_vectors;

  /* Speculatively send the first buffer to the last disposition we used */
  next_index = node->cached_next_index;

  while (n_left_from > 0)
    {
      /* set up to enqueue to our disposition with index = next_index */
      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      /*
       * As long as we have enough pkts left to process two pkts
       * and prefetch two pkts...
       */
      while (n_left_from >= 4 && n_left_to_next >= 2)
	{
	  vlib_buffer_t *b0, *b1;
	  ip4_header_t *ip0, *ip1;
	  ip4_and_gre_union_t *h0, *h1;
	  u32 bi0, next0, bi1, next1;
	  __attribute__ ((unused)) u8 error0, error1;

	  /* Prefetch the 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);

	    /*
	     * Prefetch packet data. We expect to overwrite
	     * the inbound L2 header with an ip header and a
	     * gre header. Might want to prefetch the last line
	     * of rewrite space as well; need profile data
	     */
	    CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
	    CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
	  }

	  /* Pick up the next two buffer indices */
	  bi0 = from[0];
	  bi1 = from[1];

	  /* Speculatively enqueue them where we sent the last buffer */
	  to_next[0] = bi0;
	  to_next[1] = bi1;
	  from += 2;
	  to_next += 2;
	  n_left_to_next -= 2;
	  n_left_from -= 2;

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

	  vlib_buffer_advance (b0, -sizeof (*h0));
	  vlib_buffer_advance (b1, -sizeof (*h1));

	  h0 = vlib_buffer_get_current (b0);
	  h1 = vlib_buffer_get_current (b1);
	  h0->as_u64[0] = 0;
	  h0->as_u64[1] = 0;
	  h0->as_u64[2] = 0;

	  h1->as_u64[0] = 0;
	  h1->as_u64[1] = 0;
	  h1->as_u64[2] = 0;

	  ip0 = &h0->ip4_and_gre.ip4;
	  h0->ip4_and_gre.gre.protocol = l2_gre_protocol_ethertype;
	  ip0->ip_version_and_header_length = 0x45;
	  ip0->ttl = 254;
	  ip0->protocol = IP_PROTOCOL_GRE;

	  ip1 = &h1->ip4_and_gre.ip4;
	  h1->ip4_and_gre.gre.protocol = l2_gre_protocol_ethertype;
	  ip1->ip_version_and_header_length = 0x45;
	  ip1->ttl = 254;
	  ip1->protocol = IP_PROTOCOL_GRE;

	  ip0->length =
	    clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
	  ip1->length =
	    clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
	  ip0->src_address.as_u32 = t->tunnel_src.as_u32;
	  ip1->src_address.as_u32 = t->tunnel_src.as_u32;
	  ip0->dst_address.as_u32 = t->tunnel_dst.as_u32;
	  ip1->dst_address.as_u32 = t->tunnel_dst.as_u32;
	  ip0->checksum = ip4_header_checksum (ip0);
	  ip1->checksum = ip4_header_checksum (ip1);

	  vnet_buffer (b0)->sw_if_index[VLIB_RX] =
	    vnet_buffer (b0)->sw_if_index[VLIB_TX];
	  vnet_buffer (b1)->sw_if_index[VLIB_RX] =
	    vnet_buffer (b1)->sw_if_index[VLIB_TX];

	  vnet_buffer (b0)->ipsec.sad_index = t->local_sa;
	  vnet_buffer (b1)->ipsec.sad_index = t->local_sa;

	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
	  vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;

	  next0 = IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT;
	  next1 = IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT;
	  error0 = IPSEC_GRE_ERROR_NONE;
	  error1 = IPSEC_GRE_ERROR_NONE;

	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node,
							 b0, sizeof (*tr));
	      tr->tunnel_id = t - igm->tunnels;
	      tr->length = ip0->length;
	      tr->src.as_u32 = ip0->src_address.as_u32;
	      tr->dst.as_u32 = ip0->dst_address.as_u32;
	      tr->sa_id = t->local_sa_id;
	    }

	  if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node,
							 b1, sizeof (*tr));
	      tr->tunnel_id = t - igm->tunnels;
	      tr->length = ip1->length;
	      tr->src.as_u32 = ip1->src_address.as_u32;
	      tr->dst.as_u32 = ip1->dst_address.as_u32;
	      tr->sa_id = t->local_sa_id;
	    }

	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
					   to_next, n_left_to_next,
					   bi0, bi1, next0, next1);
	}

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  vlib_buffer_t *b0;
	  ip4_header_t *ip0;
	  ip4_and_gre_union_t *h0;
	  u32 bi0, next0;
	  __attribute__ ((unused)) u8 error0;

	  bi0 = to_next[0] = from[0];
	  from += 1;
	  n_left_from -= 1;
	  to_next += 1;
	  n_left_to_next -= 1;

	  b0 = vlib_get_buffer (vm, bi0);

	  vlib_buffer_advance (b0, -sizeof (*h0));

	  h0 = vlib_buffer_get_current (b0);
	  h0->as_u64[0] = 0;
	  h0->as_u64[1] = 0;
	  h0->as_u64[2] = 0;

	  ip0 = &h0->ip4_and_gre.ip4;
	  h0->ip4_and_gre.gre.protocol = l2_gre_protocol_ethertype;
	  ip0->ip_version_and_header_length = 0x45;
	  ip0->ttl = 254;
	  ip0->protocol = IP_PROTOCOL_GRE;
	  ip0->length =
	    clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
	  ip0->src_address.as_u32 = t->tunnel_src.as_u32;
	  ip0->dst_address.as_u32 = t->tunnel_dst.as_u32;
	  ip0->checksum = ip4_header_checksum (ip0);

	  vnet_buffer (b0)->sw_if_index[VLIB_RX] =
	    vnet_buffer (b0)->sw_if_index[VLIB_TX];
	  vnet_buffer (b0)->ipsec.sad_index = t->local_sa;
	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;

	  next0 = IPSEC_GRE_OUTPUT_NEXT_ESP_ENCRYPT;
	  error0 = IPSEC_GRE_ERROR_NONE;

	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	    {
	      ipsec_gre_tx_trace_t *tr = vlib_add_trace (vm, node,
							 b0, sizeof (*tr));
	      tr->tunnel_id = t - igm->tunnels;
	      tr->length = ip0->length;
	      tr->src.as_u32 = ip0->src_address.as_u32;
	      tr->dst.as_u32 = ip0->dst_address.as_u32;
	      tr->sa_id = t->local_sa_id;
	    }

	  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, ipsec_gre_input_node.index,
			       IPSEC_GRE_ERROR_PKTS_ENCAP, frame->n_vectors);

  return frame->n_vectors;
}

static clib_error_t *
ipsec_gre_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index,
				   u32 flags)
{
  if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
    vnet_hw_interface_set_flags (vnm, hw_if_index,
				 VNET_HW_INTERFACE_FLAG_LINK_UP);
  else
    vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */ );

  return /* no error */ 0;
}

static u8 *
format_ipsec_gre_tunnel_name (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  return format (s, "ipsec-gre%d", dev_instance);
}

static u8 *
format_ipsec_gre_device (u8 * s, va_list * args)
{
  u32 dev_instance = va_arg (*args, u32);
  CLIB_UNUSED (int verbose) = va_arg (*args, int);

  s = format (s, "IPSEC-GRE tunnel: id %d\n", dev_instance);
  return s;
}

/* *INDENT-OFF* */
VNET_DEVICE_CLASS (ipsec_gre_device_class) = {
  .name = "IPSec GRE tunnel device",
  .format_device_name = format_ipsec_gre_tunnel_name,
  .format_device = format_ipsec_gre_device,
  .format_tx_trace = format_ipsec_gre_tx_trace,
  .admin_up_down_function = ipsec_gre_interface_admin_up_down,
};


#ifndef CLIB_MARCH_VARIANT
VNET_HW_INTERFACE_CLASS (ipsec_gre_hw_interface_class) = {
  .name = "IPSEC-GRE",
};
#endif /* CLIB_MARCH_VARIANT */
/* *INDENT-ON* */

static clib_error_t *
ipsec_gre_init (vlib_main_t * vm)
{
  ipsec_gre_main_t *igm = &ipsec_gre_main;
  clib_error_t *error;

  clib_memset (igm, 0, sizeof (igm[0]));
  igm->vlib_main = vm;
  igm->vnet_main = vnet_get_main ();

  if ((error = vlib_call_init_function (vm, ip_main_init)))
    return error;

  if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
    return error;

  igm->tunnel_by_key = hash_create (0, sizeof (uword));

  return vlib_call_init_function (vm, ipsec_gre_input_init);
}

VLIB_INIT_FUNCTION (ipsec_gre_init);

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