summaryrefslogtreecommitdiffstats
path: root/src/plugins/nat/nat66/nat66.c
blob: a8de3f6e0fa10d08ae76d73ba810dd553e988f32 (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
/*
 * 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.
 */
/**
 * @file
 * @brief NAT66 implementation
 */

#include <vpp/app/version.h>
#include <vnet/plugin/plugin.h>
#include <nat/nat66/nat66.h>
#include <vnet/fib/fib_table.h>
#include <vnet/ip/reass/ip6_sv_reass.h>

nat66_main_t nat66_main;
fib_source_t nat_fib_src_hi;

/* *INDENT-OFF* */

/* Hook up input features */
VNET_FEATURE_INIT (nat66_in2out, static) = {
  .arc_name = "ip6-unicast",
  .node_name = "nat66-in2out",
  .runs_before = VNET_FEATURES ("ip6-lookup"),
  .runs_after = VNET_FEATURES ("ip6-sv-reassembly-feature"),
};
VNET_FEATURE_INIT (nat66_out2in, static) = {
  .arc_name = "ip6-unicast",
  .node_name = "nat66-out2in",
  .runs_before = VNET_FEATURES ("ip6-lookup"),
  .runs_after = VNET_FEATURES ("ip6-sv-reassembly-feature"),
};

/* *INDENT-ON* */

clib_error_t *nat66_plugin_api_hookup (vlib_main_t * vm);
static clib_error_t *
nat66_init (vlib_main_t * vm)
{
  nat66_main_t *nm = &nat66_main;
  vlib_node_t *node;
  u32 static_mapping_buckets = 1024;
  uword static_mapping_memory_size = 64 << 20;

  node = vlib_get_node_by_name (vm, (u8 *) "nat66-in2out");
  nm->in2out_node_index = node->index;

  node = vlib_get_node_by_name (vm, (u8 *) "nat66-out2in");
  nm->out2in_node_index = node->index;

  clib_bihash_init_24_8 (&nm->sm_l, "nat66-static-map-by-local",
			 static_mapping_buckets, static_mapping_memory_size);
  clib_bihash_init_24_8 (&nm->sm_e, "nat66-static-map-by-external",
			 static_mapping_buckets, static_mapping_memory_size);

  nm->session_counters.name = "session counters";

  nat_fib_src_hi = fib_source_allocate ("nat66-hi",
					FIB_SOURCE_PRIORITY_HI,
					FIB_SOURCE_BH_SIMPLE);

  nm->in2out_packets.name = "in2out";
  nm->in2out_packets.stat_segment_name = "/nat64/in2out";
  nm->out2in_packets.name = "out2in";
  nm->out2in_packets.stat_segment_name = "/nat64/out2in";
  return nat66_plugin_api_hookup (vm);
}

static void
nat66_validate_counters (nat66_main_t * nm, u32 sw_if_index)
{
  vlib_validate_simple_counter (&nm->in2out_packets, sw_if_index);
  vlib_zero_simple_counter (&nm->in2out_packets, sw_if_index);
  vlib_validate_simple_counter (&nm->out2in_packets, sw_if_index);
  vlib_zero_simple_counter (&nm->out2in_packets, sw_if_index);
}

int
nat66_interface_add_del (u32 sw_if_index, u8 is_inside, u8 is_add)
{
  nat66_main_t *nm = &nat66_main;
  nat66_interface_t *interface = 0, *i;
  const char *feature_name;

  /* *INDENT-OFF* */
  pool_foreach (i, nm->interfaces)
   {
    if (i->sw_if_index == sw_if_index)
      {
        interface = i;
        break;
      }
  }
  /* *INDENT-ON* */

  if (is_add)
    {
      if (interface)
	return VNET_API_ERROR_VALUE_EXIST;

      pool_get (nm->interfaces, interface);
      interface->sw_if_index = sw_if_index;
      interface->flags =
	is_inside ? NAT66_INTERFACE_FLAG_IS_INSIDE :
	NAT66_INTERFACE_FLAG_IS_OUTSIDE;
      nat66_validate_counters (nm, sw_if_index);
    }
  else
    {
      if (!interface)
	return VNET_API_ERROR_NO_SUCH_ENTRY;

      pool_put (nm->interfaces, interface);
    }

  feature_name = is_inside ? "nat66-in2out" : "nat66-out2in";
  int rv = ip6_sv_reass_enable_disable_with_refcnt (sw_if_index, is_add);
  if (rv)
    return rv;
  return vnet_feature_enable_disable ("ip6-unicast", feature_name,
				      sw_if_index, is_add, 0, 0);
}

void
nat66_interfaces_walk (nat66_interface_walk_fn_t fn, void *ctx)
{
  nat66_main_t *nm = &nat66_main;
  nat66_interface_t *i = 0;

  /* *INDENT-OFF* */
  pool_foreach (i, nm->interfaces)
   {
    if (fn (i, ctx))
      break;
  }
  /* *INDENT-ON* */
}

nat66_static_mapping_t *
nat66_static_mapping_get (ip6_address_t * addr, u32 fib_index, u8 is_local)
{
  nat66_main_t *nm = &nat66_main;
  nat66_static_mapping_t *sm = 0;
  nat66_sm_key_t sm_key;
  clib_bihash_kv_24_8_t kv, value;

  sm_key.addr.as_u64[0] = addr->as_u64[0];
  sm_key.addr.as_u64[1] = addr->as_u64[1];
  sm_key.fib_index = fib_index;
  sm_key.rsvd = 0;

  kv.key[0] = sm_key.as_u64[0];
  kv.key[1] = sm_key.as_u64[1];
  kv.key[2] = sm_key.as_u64[2];

  if (!clib_bihash_search_24_8
      (is_local ? &nm->sm_l : &nm->sm_e, &kv, &value))
    sm = pool_elt_at_index (nm->sm, value.value);

  return sm;
}

int
nat66_static_mapping_add_del (ip6_address_t * l_addr, ip6_address_t * e_addr,
			      u32 vrf_id, u8 is_add)
{
  nat66_main_t *nm = &nat66_main;
  int rv = 0;
  nat66_static_mapping_t *sm = 0;
  nat66_sm_key_t sm_key;
  clib_bihash_kv_24_8_t kv, value;
  u32 fib_index = fib_table_find (FIB_PROTOCOL_IP6, vrf_id);

  sm_key.addr.as_u64[0] = l_addr->as_u64[0];
  sm_key.addr.as_u64[1] = l_addr->as_u64[1];
  sm_key.fib_index = fib_index;
  sm_key.rsvd = 0;
  kv.key[0] = sm_key.as_u64[0];
  kv.key[1] = sm_key.as_u64[1];
  kv.key[2] = sm_key.as_u64[2];

  if (!clib_bihash_search_24_8 (&nm->sm_l, &kv, &value))
    sm = pool_elt_at_index (nm->sm, value.value);

  if (is_add)
    {
      if (sm)
	return VNET_API_ERROR_VALUE_EXIST;

      fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, vrf_id,
						     nat_fib_src_hi);
      pool_get (nm->sm, sm);
      clib_memset (sm, 0, sizeof (*sm));
      sm->l_addr.as_u64[0] = l_addr->as_u64[0];
      sm->l_addr.as_u64[1] = l_addr->as_u64[1];
      sm->e_addr.as_u64[0] = e_addr->as_u64[0];
      sm->e_addr.as_u64[1] = e_addr->as_u64[1];
      sm->fib_index = fib_index;

      sm_key.fib_index = fib_index;
      kv.key[0] = sm_key.as_u64[0];
      kv.key[1] = sm_key.as_u64[1];
      kv.key[2] = sm_key.as_u64[2];
      kv.value = sm - nm->sm;
      if (clib_bihash_add_del_24_8 (&nm->sm_l, &kv, 1))
	nat66_elog_warn ("nat66-static-map-by-local add key failed");
      sm_key.addr.as_u64[0] = e_addr->as_u64[0];
      sm_key.addr.as_u64[1] = e_addr->as_u64[1];
      sm_key.fib_index = 0;
      kv.key[0] = sm_key.as_u64[0];
      kv.key[1] = sm_key.as_u64[1];
      kv.key[2] = sm_key.as_u64[2];
      if (clib_bihash_add_del_24_8 (&nm->sm_e, &kv, 1))
	nat66_elog_warn ("nat66-static-map-by-external add key failed");

      vlib_validate_combined_counter (&nm->session_counters, kv.value);
      vlib_zero_combined_counter (&nm->session_counters, kv.value);
    }
  else
    {
      if (!sm)
	return VNET_API_ERROR_NO_SUCH_ENTRY;

      kv.value = sm - nm->sm;
      if (clib_bihash_add_del_24_8 (&nm->sm_l, &kv, 0))
	nat66_elog_warn ("nat66-static-map-by-local delete key failed");
      sm_key.addr.as_u64[0] = e_addr->as_u64[0];
      sm_key.addr.as_u64[1] = e_addr->as_u64[1];
      sm_key.fib_index = 0;
      kv.key[0] = sm_key.as_u64[0];
      kv.key[1] = sm_key.as_u64[1];
      kv.key[2] = sm_key.as_u64[2];
      if (clib_bihash_add_del_24_8 (&nm->sm_e, &kv, 0))
	nat66_elog_warn ("nat66-static-map-by-external delete key failed");
      fib_table_unlock (sm->fib_index, FIB_PROTOCOL_IP6, nat_fib_src_hi);
      pool_put (nm->sm, sm);
    }

  return rv;
}

void
nat66_static_mappings_walk (nat66_static_mapping_walk_fn_t fn, void *ctx)
{
  nat66_main_t *nm = &nat66_main;
  nat66_static_mapping_t *sm = 0;

  /* *INDENT-OFF* */
  pool_foreach (sm, nm->sm)
   {
    if (fn (sm, ctx))
      break;
  }
  /* *INDENT-ON* */
}

/*static*/ void
nat66_config (void)
{
  nat66_main_t *nm = &nat66_main;
  u32 outside_ip6_vrf_id = 0;

  nm->outside_vrf_id = outside_ip6_vrf_id;
  nm->outside_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6,
							     outside_ip6_vrf_id,
							     nat_fib_src_hi);

}

/* *INDENT-OFF* */
VLIB_PLUGIN_REGISTER () =
{
 .version = VPP_BUILD_VER,
 .description = "NAT66",
};

VLIB_INIT_FUNCTION (nat66_init);

/* *INDENT-ON* */

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