summaryrefslogtreecommitdiffstats
path: root/src/vnet/lisp-gpe/lisp_gpe_tunnel.c
blob: e4ad872790c6313c67f39486788927d848b8c6f7 (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
/*
 * 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 Common utility functions for IPv4, IPv6 and L2 LISP-GPE tunnels.
 *
 */
#include <vnet/lisp-gpe/lisp_gpe.h>
#include <vnet/lisp-gpe/lisp_gpe_tunnel.h>
#include <vnet/lisp-gpe/lisp_gpe_adjacency.h>

#include <vnet/fib/fib_table.h>

/**
 * @brief Pool of all LISP tunnels
 */
static lisp_gpe_tunnel_t *lisp_gpe_tunnel_pool;

/**
 * @brief a DB of all tunnels
 */
static uword *lisp_gpe_tunnel_db;

/**
 * @brief Compute IP-UDP-GPE sub-tunnel encap/rewrite header.
 *
 * @param[in]   t       Parent of the sub-tunnel.
 * @param[in]   st      Sub-tunnel.
 * @param[in]   lp      Local and remote locators used in the encap header.
 *
 * @return 0 on success.
 */
u8 *
lisp_gpe_tunnel_build_rewrite (const lisp_gpe_tunnel_t * lgt,
			       const lisp_gpe_adjacency_t * ladj,
			       lisp_gpe_next_protocol_e payload_proto)
{
  lisp_gpe_header_t *lisp0;
  u8 *rw = 0;
  int len;
  gpe_encap_mode_t encap_mode = vnet_gpe_get_encap_mode ();

  if (IP4 == ip_addr_version (&lgt->key->lcl))
    {
      ip4_udp_lisp_gpe_header_t *h0;
      ip4_header_t *ip0;

      len = sizeof (*h0);

      vec_validate_aligned (rw, len - 1, CLIB_CACHE_LINE_BYTES);

      h0 = (ip4_udp_lisp_gpe_header_t *) rw;

      /* Fixed portion of the (outer) ip4 header */
      ip0 = &h0->ip4;
      ip0->ip_version_and_header_length = 0x45;
      ip0->ttl = 254;
      ip0->protocol = IP_PROTOCOL_UDP;

      /* we fix up the ip4 header length and checksum after-the-fact */
      ip_address_copy_addr (&ip0->src_address, &lgt->key->lcl);
      ip_address_copy_addr (&ip0->dst_address, &lgt->key->rmt);
      ip0->checksum = ip4_header_checksum (ip0);

      /* UDP header, randomize src port on something, maybe? */
      h0->udp.src_port = clib_host_to_net_u16 (4341);
      h0->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_lisp_gpe);

      /* LISP-gpe header */
      lisp0 = &h0->lisp;
    }
  else
    {
      ip6_udp_lisp_gpe_header_t *h0;
      ip6_header_t *ip0;

      len = sizeof (*h0);

      vec_validate_aligned (rw, len - 1, CLIB_CACHE_LINE_BYTES);

      h0 = (ip6_udp_lisp_gpe_header_t *) rw;

      /* Fixed portion of the (outer) ip6 header */
      ip0 = &h0->ip6;
      ip0->ip_version_traffic_class_and_flow_label =
	clib_host_to_net_u32 (0x6 << 28);
      ip0->hop_limit = 254;
      ip0->protocol = IP_PROTOCOL_UDP;

      /* we fix up the ip6 header length after-the-fact */
      ip_address_copy_addr (&ip0->src_address, &lgt->key->lcl);
      ip_address_copy_addr (&ip0->dst_address, &lgt->key->rmt);

      /* UDP header, randomize src port on something, maybe? */
      h0->udp.src_port = clib_host_to_net_u16 (4341);
      h0->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_lisp_gpe);

      /* LISP-gpe header */
      lisp0 = &h0->lisp;
    }

  lisp0->flags = ladj->flags;
  if (GPE_ENCAP_VXLAN == encap_mode)
    /* unset P flag */
    lisp0->flags &= ~LISP_GPE_FLAGS_P;

  lisp0->ver_res = 0;
  lisp0->res = 0;
  lisp0->next_protocol = payload_proto;
  lisp0->iid = clib_host_to_net_u32 (ladj->vni) >> 8;	/* first 24 bits only */

  return (rw);
}

static lisp_gpe_tunnel_t *
lisp_gpe_tunnel_db_find (const lisp_gpe_tunnel_key_t * key)
{
  uword *p;

  p = hash_get_mem (lisp_gpe_tunnel_db, (void *) key);

  if (NULL != p)
    {
      return (pool_elt_at_index (lisp_gpe_tunnel_pool, p[0]));
    }
  return (NULL);
}

lisp_gpe_tunnel_t *
lisp_gpe_tunnel_get_i (index_t lgti)
{
  return (pool_elt_at_index (lisp_gpe_tunnel_pool, lgti));
}

index_t
lisp_gpe_tunnel_find_or_create_and_lock (const locator_pair_t * pair,
					 u32 rloc_fib_index)
{
  lisp_gpe_tunnel_key_t key = {
    .lcl = pair->lcl_loc,
    .rmt = pair->rmt_loc,
    .fib_index = rloc_fib_index,
  };
  lisp_gpe_tunnel_t *lgt;
  fib_prefix_t pfx;

  lgt = lisp_gpe_tunnel_db_find (&key);

  if (NULL == lgt)
    {
      pool_get (lisp_gpe_tunnel_pool, lgt);
      clib_memset (lgt, 0, sizeof (*lgt));

      lgt->key = clib_mem_alloc (sizeof (*lgt->key));
      clib_memset (lgt->key, 0, sizeof (*lgt->key));

      lgt->key->rmt = pair->rmt_loc;
      lgt->key->lcl = pair->lcl_loc;
      lgt->key->fib_index = rloc_fib_index;

      /*
       * source the FIB entry for the RLOC so we can track its forwarding
       * chain
       */
      ip_address_to_fib_prefix (&lgt->key->rmt, &pfx);

      lgt->fib_entry_index = fib_table_entry_special_add (rloc_fib_index,
							  &pfx,
							  FIB_SOURCE_RR,
							  FIB_ENTRY_FLAG_NONE);

      hash_set_mem (lisp_gpe_tunnel_db, &lgt->key,
		    (lgt - lisp_gpe_tunnel_pool));
    }

  lgt->locks++;

  return (lgt - lisp_gpe_tunnel_pool);
}

void
lisp_gpe_tunnel_unlock (index_t lgti)
{
  lisp_gpe_tunnel_t *lgt;

  lgt = lisp_gpe_tunnel_get_i (lgti);
  lgt->locks--;

  if (0 == lgt->locks)
    {
      hash_unset_mem (lisp_gpe_tunnel_db, &lgt->key);
      clib_mem_free (lgt->key);
      pool_put (lisp_gpe_tunnel_pool, lgt);
    }
}

const lisp_gpe_tunnel_t *
lisp_gpe_tunnel_get (index_t lgti)
{
  return (lisp_gpe_tunnel_get_i (lgti));
}

/** Format LISP-GPE tunnel. */
u8 *
format_lisp_gpe_tunnel (u8 * s, va_list * args)
{
  lisp_gpe_tunnel_t *lgt = va_arg (*args, lisp_gpe_tunnel_t *);

  s = format (s, "tunnel %d\n", lgt - lisp_gpe_tunnel_pool);
  s = format (s, " fib-index: %d, locks:%d \n",
	      lgt->key->fib_index, lgt->locks);
  s = format (s, " lisp ver 0\n");

  s = format (s, " locator-pair:\n");
  s = format (s, "  local: %U remote: %U\n",
	      format_ip_address, &lgt->key->lcl,
	      format_ip_address, &lgt->key->rmt);
  s = format (s, " RLOC FIB entry: %d\n", lgt->fib_entry_index);

  return s;
}

/**
 * CLI command to show LISP-GPE tunnels.
 */
static clib_error_t *
show_lisp_gpe_tunnel_command_fn (vlib_main_t * vm,
				 unformat_input_t * input,
				 vlib_cli_command_t * cmd)
{
  lisp_gpe_tunnel_t *lgt;
  index_t index;

  if (pool_elts (lisp_gpe_tunnel_pool) == 0)
    vlib_cli_output (vm, "No lisp-gpe tunnels configured...");

  if (unformat (input, "%d", &index))
    {
      lgt = lisp_gpe_tunnel_get_i (index);
      vlib_cli_output (vm, "%U", format_lisp_gpe_tunnel, lgt);
    }
  else
    {
      /* *INDENT-OFF* */
      pool_foreach (lgt, lisp_gpe_tunnel_pool,
      ({
	vlib_cli_output (vm, "%U", format_lisp_gpe_tunnel, lgt);
      }));
      /* *INDENT-ON* */
    }

  return 0;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (show_lisp_gpe_tunnel_command, static) =
{
  .path = "show gpe tunnel",
  .function = show_lisp_gpe_tunnel_command_fn,
};
/* *INDENT-ON* */

static clib_error_t *
lisp_gpe_tunnel_module_init (vlib_main_t * vm)
{
  lisp_gpe_tunnel_db = hash_create_mem (0,
					sizeof (lisp_gpe_tunnel_key_t),
					sizeof (uword));

  return (NULL);
}

VLIB_INIT_FUNCTION (lisp_gpe_tunnel_module_init);

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