aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/session/transport.c
blob: fc722e45668f4adec421516b331263f65e1a52a3 (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
/*
 * Copyright (c) 2017 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/session/transport_interface.h>
#include <vnet/session/session.h>
#include <vnet/fib/fib.h>

/**
 * Per-type vector of transport protocol virtual function tables
 */
transport_proto_vft_t *tp_vfts;

/*
 * Port allocator seed
 */
static u32 port_allocator_seed;

/*
 * Local endpoints table
 */
static transport_endpoint_table_t local_endpoints_table;

/*
 * Pool of local endpoints
 */
static transport_endpoint_t *local_endpoints;

/*
 * Local endpoints pool lock
 */
static clib_spinlock_t local_endpoints_lock;


u32
transport_endpoint_lookup (transport_endpoint_table_t * ht, u8 proto,
			   ip46_address_t * ip, u16 port)
{
  clib_bihash_kv_24_8_t kv;
  int rv;

  kv.key[0] = ip->as_u64[0];
  kv.key[1] = ip->as_u64[1];
  kv.key[2] = (u64) port << 8 | (u64) proto;

  rv = clib_bihash_search_inline_24_8 (ht, &kv);
  if (rv == 0)
    return kv.value;

  return ENDPOINT_INVALID_INDEX;
}

void
transport_endpoint_table_add (transport_endpoint_table_t * ht, u8 proto,
			      transport_endpoint_t * te, u32 value)
{
  clib_bihash_kv_24_8_t kv;

  kv.key[0] = te->ip.as_u64[0];
  kv.key[1] = te->ip.as_u64[1];
  kv.key[2] = (u64) te->port << 8 | (u64) proto;
  kv.value = value;

  clib_bihash_add_del_24_8 (ht, &kv, 1);
}

void
transport_endpoint_table_del (transport_endpoint_table_t * ht, u8 proto,
			      transport_endpoint_t * te)
{
  clib_bihash_kv_24_8_t kv;

  kv.key[0] = te->ip.as_u64[0];
  kv.key[1] = te->ip.as_u64[1];
  kv.key[2] = (u64) te->port << 8 | (u64) proto;

  clib_bihash_add_del_24_8 (ht, &kv, 0);
}

/**
 * Register transport virtual function table.
 *
 * @param type - session type (not protocol type)
 * @param vft - virtual function table
 */
void
transport_register_protocol (transport_proto_t transport_proto, u8 is_ip4,
			     const transport_proto_vft_t * vft)
{
  u8 session_type;
  session_type = session_type_from_proto_and_ip (transport_proto, is_ip4);

  vec_validate (tp_vfts, session_type);
  tp_vfts[session_type] = *vft;

  /* If an offset function is provided, then peek instead of dequeue */
  session_manager_set_transport_rx_fn (session_type,
				       vft->tx_fifo_offset != 0);
}

/**
 * Get transport virtual function table
 *
 * @param type - session type (not protocol type)
 */
transport_proto_vft_t *
transport_protocol_get_vft (u8 session_type)
{
  if (session_type >= vec_len (tp_vfts))
    return 0;
  return &tp_vfts[session_type];
}

#define PORT_MASK ((1 << 16)- 1)

void
transport_endpoint_del (u32 tepi)
{
  clib_spinlock_lock_if_init (&local_endpoints_lock);
  pool_put_index (local_endpoints, tepi);
  clib_spinlock_unlock_if_init (&local_endpoints_lock);
}

always_inline transport_endpoint_t *
transport_endpoint_new (void)
{
  transport_endpoint_t *tep;
  pool_get (local_endpoints, tep);
  return tep;
}

void
transport_endpoint_cleanup (u8 proto, ip46_address_t * lcl_ip, u16 port)
{
  u32 tepi;
  transport_endpoint_t *tep;

  /* Cleanup local endpoint if this was an active connect */
  tepi = transport_endpoint_lookup (&local_endpoints_table, proto, lcl_ip,
				    clib_net_to_host_u16 (port));
  if (tepi != ENDPOINT_INVALID_INDEX)
    {
      tep = pool_elt_at_index (local_endpoints, tepi);
      transport_endpoint_table_del (&local_endpoints_table, proto, tep);
      transport_endpoint_del (tepi);
    }
}

/**
 * Allocate local port and add if successful add entry to local endpoint
 * table to mark the pair as used.
 */
int
transport_alloc_local_port (u8 proto, ip46_address_t * ip)
{
  transport_endpoint_t *tep;
  u32 tei;
  u16 min = 1024, max = 65535;	/* XXX configurable ? */
  int tries, limit;

  limit = max - min;

  /* Only support active opens from thread 0 */
  ASSERT (vlib_get_thread_index () == 0);

  /* Search for first free slot */
  for (tries = 0; tries < limit; tries++)
    {
      u16 port = 0;

      /* Find a port in the specified range */
      while (1)
	{
	  port = random_u32 (&port_allocator_seed) & PORT_MASK;
	  if (PREDICT_TRUE (port >= min && port < max))
	    break;
	}

      /* Look it up. If not found, we're done */
      tei = transport_endpoint_lookup (&local_endpoints_table, proto, ip,
				       port);
      if (tei == ENDPOINT_INVALID_INDEX)
	{
	  clib_spinlock_lock_if_init (&local_endpoints_lock);
	  tep = transport_endpoint_new ();
	  clib_memcpy (&tep->ip, ip, sizeof (*ip));
	  tep->port = port;
	  transport_endpoint_table_add (&local_endpoints_table, proto, tep,
					tep - local_endpoints);
	  clib_spinlock_unlock_if_init (&local_endpoints_lock);

	  return tep->port;
	}
    }
  return -1;
}

int
transport_alloc_local_endpoint (u8 proto, transport_endpoint_t * rmt,
				ip46_address_t * lcl_addr, u16 * lcl_port)
{
  fib_prefix_t prefix;
  fib_node_index_t fei;
  u32 sw_if_index;
  int port;

  /*
   * Find the local address and allocate port
   */

  /* Find a FIB path to the destination */
  clib_memcpy (&prefix.fp_addr, &rmt->ip, sizeof (rmt->ip));
  prefix.fp_proto = rmt->is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6;
  prefix.fp_len = rmt->is_ip4 ? 32 : 128;

  ASSERT (rmt->fib_index != ENDPOINT_INVALID_INDEX);
  fei = fib_table_lookup (rmt->fib_index, &prefix);

  /* Couldn't find route to destination. Bail out. */
  if (fei == FIB_NODE_INDEX_INVALID)
    {
      clib_warning ("no route to destination");
      return -1;
    }

  sw_if_index = rmt->sw_if_index;
  if (sw_if_index == ENDPOINT_INVALID_INDEX)
    sw_if_index = fib_entry_get_resolving_interface (fei);

  if (sw_if_index == ENDPOINT_INVALID_INDEX)
    {
      clib_warning ("no resolving interface for %U", format_ip46_address,
		    &rmt->ip, (rmt->is_ip4 == 0) + 1);
      return -1;
    }

  memset (lcl_addr, 0, sizeof (*lcl_addr));

  if (rmt->is_ip4)
    {
      ip4_address_t *ip4;
      ip4 = ip_interface_get_first_ip (sw_if_index, 1);
      lcl_addr->ip4.as_u32 = ip4->as_u32;
    }
  else
    {
      ip6_address_t *ip6;
      ip6 = ip_interface_get_first_ip (sw_if_index, 0);
      if (ip6 == 0)
	{
	  clib_warning ("no routable ip6 addresses on %U",
			format_vnet_sw_if_index_name, vnet_get_main (),
			sw_if_index);
	  return -1;
	}
      clib_memcpy (&lcl_addr->ip6, ip6, sizeof (*ip6));
    }

  /* Allocate source port */
  port = transport_alloc_local_port (proto, lcl_addr);
  if (port < 1)
    {
      clib_warning ("Failed to allocate src port");
      return -1;
    }
  *lcl_port = port;
  return 0;
}

void
transport_init (void)
{
  vlib_thread_main_t *vtm = vlib_get_thread_main ();
  u32 local_endpoints_table_buckets = 250000;
  u32 local_endpoints_table_memory = 512 << 20;
  u32 num_threads;

  /* Initialize [port-allocator] random number seed */
  port_allocator_seed = (u32) clib_cpu_time_now ();

  clib_bihash_init_24_8 (&local_endpoints_table, "local endpoints table",
			 local_endpoints_table_buckets,
			 local_endpoints_table_memory);
  num_threads = 1 /* main thread */  + vtm->n_threads;
  if (num_threads > 1)
    clib_spinlock_init (&local_endpoints_lock);
}

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