aboutsummaryrefslogtreecommitdiffstats
path: root/src/plugins/cnat/cnat_translation.h
blob: 7a0358145446d1e74432dac2fc54fcd76e24ba27 (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
/*
 * Copyright (c) 2020 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.
 */

#ifndef __CNAT_TRANSLATION_H__
#define __CNAT_TRANSLATION_H__

#include <cnat/cnat_types.h>
#include <vnet/ip/ip_types.h>
#include <vppinfra/bihash_8_8.h>

/**
 * Counters for each translation
 */
extern vlib_combined_counter_main_t cnat_translation_counters;

/**
 * Data used to track an EP in the FIB
 */
typedef struct cnat_ep_trk_t_
{
  /**
   * The EP being tracked
   */
  cnat_endpoint_t ct_ep[VLIB_N_DIR];

  /**
   * The FIB entry for the EP
   */
  fib_node_index_t ct_fei;

  /**
   * The sibling on the entry's child list
   */
  u32 ct_sibling;

  /**
   * The forwarding contributed by the entry
   */
  dpo_id_t ct_dpo;

  /**
   * Allows to disable if not resolved yet
   */
  u8 is_active;
} cnat_ep_trk_t;

typedef enum cnat_translation_flag_t_
{
  /* Do allocate a source port */
  CNAT_TRANSLATION_FLAG_ALLOCATE_PORT = (1 << 0),
  /* Has this translation been satcked ?
   * this allow not being called twice when
   * with more then FIB_PATH_LIST_POPULAR backends  */
  CNAT_TRANSLATION_STACKED = (1 << 1),
} cnat_translation_flag_t;

typedef enum
{
  CNAT_RESOLV_ADDR_ANY,
  CNAT_RESOLV_ADDR_BACKEND,
  CNAT_RESOLV_ADDR_SNAT,
  CNAT_RESOLV_ADDR_TRANSLATION,
  CNAT_ADDR_N_RESOLUTIONS,
} cnat_addr_resol_type_t;

/**
 * Entry used to account for a translation's backend
 * waiting for address resolution
 */
typedef struct addr_resolution_t_
{
  /**
   * The interface index to resolve
   */
  u32 sw_if_index;
  /**
   * ip4 or ip6 resolution
   */
  ip_address_family_t af;
  /**
   * The cnat_addr_resolution_t
   */
  cnat_addr_resol_type_t type;
  /**
   * Translation index
   */
  index_t cti;
  /**
   * Callback data
   */
  u64 opaque;
} addr_resolution_t;

/**
 * A Translation represents the translation of a VEP to one of a set
 * of real server addresses
 */
typedef struct cnat_translation_t_
{
  /**
   * Linkage into the FIB graph
   */
  fib_node_t ct_node;

  /**
   * The LB used to forward to the backends
   */
  dpo_id_t ct_lb;

  /**
   * The Virtual end point
   */
  cnat_endpoint_t ct_vip;

  /**
   * The vector of tracked back-ends
   */
  cnat_ep_trk_t *ct_paths;

  /**
   * The ip protocol for the translation
   */
  ip_protocol_t ct_proto;

  /**
   * The client object this translation belongs on
   * INDEX_INVALID if vip is unresolved
   */
  index_t ct_cci;

  /**
   * Own index (if copied for trace)
   */
  index_t index;

  /**
   * Translation flags
   */
  u8 flags;
} cnat_translation_t;

extern cnat_translation_t *cnat_translation_pool;

extern u8 *format_cnat_translation (u8 * s, va_list * args);

/**
 * create or update a translation
 *
 * @param vip The Virtual Endpoint
 * @param ip_proto The ip protocol to translate
 * @param backends the backends to choose from
 *
 * @return the ID of the translation. used to delete and gather stats
 */
extern u32 cnat_translation_update (cnat_endpoint_t * vip,
				    ip_protocol_t ip_proto,
				    cnat_endpoint_tuple_t *
				    backends, u8 flags);

/**
 * Delete a translation
 *
 * @param id the ID as returned from the create
 */
extern int cnat_translation_delete (u32 id);

/**
 * Callback function invoked during a walk of all translations
 */
typedef walk_rc_t (*cnat_translation_walk_cb_t) (index_t index, void *ctx);

/**
 * Walk/visit each of the translations
 */
extern void cnat_translation_walk (cnat_translation_walk_cb_t cb, void *ctx);

/**
 * Purge all the trahslations
 */
extern int cnat_translation_purge (void);

/**
 * Add an address resolution request
 */
extern void cnat_translation_watch_addr (index_t cti, u64 opaque,
					 cnat_endpoint_t * ep,
					 cnat_addr_resol_type_t type);

/**
 * Cleanup matching addr resolution requests
 */
extern void cnat_translation_unwatch_addr (u32 cti,
					   cnat_addr_resol_type_t type);

/*
 * Data plane functions
 */
extern clib_bihash_8_8_t cnat_translation_db;

static_always_inline cnat_translation_t *
cnat_translation_get (index_t cti)
{
  return (pool_elt_at_index (cnat_translation_pool, cti));
}

static_always_inline cnat_translation_t *
cnat_find_translation (index_t cti, u16 port, ip_protocol_t proto)
{
  clib_bihash_kv_8_8_t bkey, bvalue;
  u64 key;
  int rv;

  key = ((u64) proto << 24) | port;
  key = key << 32 | (u32) cti;

  bkey.key = key;
  rv = clib_bihash_search_inline_2_8_8 (&cnat_translation_db, &bkey, &bvalue);
  if (!rv)
    return (pool_elt_at_index (cnat_translation_pool, bvalue.value));

  return (NULL);
}

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

#endif