2 * Copyright (c) 2020 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #ifndef __CNAT_TYPES_H__
17 #define __CNAT_TYPES_H__
19 #include <vppinfra/bihash_24_8.h>
20 #include <vnet/fib/fib_node.h>
21 #include <vnet/fib/fib_source.h>
22 #include <vnet/ip/ip_types.h>
23 #include <vnet/ip/ip.h>
24 #include <vnet/util/throttle.h>
26 /* only in the default table for v4 and v6 */
27 #define CNAT_FIB_TABLE 0
29 /* default lifetime of NAT sessions (seconds) */
30 #define CNAT_DEFAULT_SESSION_MAX_AGE 30
31 /* lifetime of TCP conn NAT sessions after SYNACK (seconds) */
32 #define CNAT_DEFAULT_TCP_MAX_AGE 3600
33 /* lifetime of TCP conn NAT sessions after RST/FIN (seconds) */
34 #define CNAT_DEFAULT_TCP_RST_TIMEOUT 5
35 #define CNAT_DEFAULT_SCANNER_TIMEOUT (1.0)
37 #define CNAT_DEFAULT_SESSION_BUCKETS 1024
38 #define CNAT_DEFAULT_TRANSLATION_BUCKETS 1024
39 #define CNAT_DEFAULT_SNAT_BUCKETS 1024
40 #define CNAT_DEFAULT_SNAT_IF_MAP_LEN 4096
42 #define CNAT_DEFAULT_SESSION_MEMORY (1 << 20)
43 #define CNAT_DEFAULT_TRANSLATION_MEMORY (256 << 10)
44 #define CNAT_DEFAULT_SNAT_MEMORY (64 << 20)
46 /* Should be prime >~ 100 * numBackends */
47 #define CNAT_DEFAULT_MAGLEV_LEN 1009
49 /* This should be strictly lower than FIB_SOURCE_INTERFACE
50 * from fib_source.h */
51 #define CNAT_FIB_SOURCE_PRIORITY 0x02
53 /* Initial refcnt for timestamps (2 : session & rsession) */
54 #define CNAT_TIMESTAMP_INIT_REFCNT 2
56 #define MIN_SRC_PORT ((u16) 0xC000)
60 /* Source and destination port. */
61 u16 src_port, dst_port;
63 /* Random value to distinguish connections. */
69 typedef enum cnat_trk_flag_t_
71 /* Endpoint is active (static or dhcp resolved) */
72 CNAT_TRK_ACTIVE = (1 << 0),
73 /* Don't translate this endpoint, but still
74 * forward. Used by maglev for DSR */
75 CNAT_TRK_FLAG_NO_NAT = (1 << 1),
77 CNAT_TRK_FLAG_TEST_DISABLED = (1 << 7),
82 /* Endpoint addr has been resolved */
83 CNAT_EP_FLAG_RESOLVED = (1 << 0),
86 typedef struct cnat_endpoint_t_
94 typedef struct cnat_endpoint_tuple_t_
96 cnat_endpoint_t dst_ep;
97 cnat_endpoint_t src_ep;
98 u8 ep_flags; /* cnat_trk_flag_t */
99 } cnat_endpoint_tuple_t;
105 } cnat_echo_header_t;
107 typedef struct cnat_main_
109 /* Memory size of the session bihash */
110 uword session_hash_memory;
112 /* Number of buckets of the session bihash */
113 u32 session_hash_buckets;
115 /* Memory size of the translation bihash */
116 uword translation_hash_memory;
118 /* Number of buckets of the translation bihash */
119 u32 translation_hash_buckets;
121 /* Memory size of the source NAT prefix bihash */
122 uword snat_hash_memory;
124 /* Number of buckets of the source NAT prefix bihash */
125 u32 snat_hash_buckets;
127 /* Bit map for include / exclude sw_if_index
128 * so max number of expected interfaces */
129 u32 snat_if_map_length;
131 /* Timeout after which to clear sessions (in seconds) */
134 /* Timeout after which to clear an established TCP
135 * session (in seconds) */
138 /* delay in seconds between two scans of session/clients tables */
141 /* Lock for the timestamp pool */
142 clib_rwlock_t ts_lock;
144 /* Index of the scanner process node */
145 uword scanner_node_index;
147 /* Did we do lazy init ? */
150 /* Enable or Disable the scanner on startup */
151 u8 default_scanner_state;
153 /* Number of buckets for maglev, should be a
154 * prime >= 100 * max num bakends */
158 typedef struct cnat_timestamp_t_
160 /* Last time said session was seen */
162 /* expire after N seconds */
164 /* Users refcount, initially 3 (session, rsession, dpo) */
168 typedef struct cnat_node_ctx_
172 ip_address_family_t af;
176 cnat_main_t *cnat_get_main ();
177 extern u8 *format_cnat_endpoint (u8 * s, va_list * args);
178 extern uword unformat_cnat_ep_tuple (unformat_input_t * input,
180 extern uword unformat_cnat_ep (unformat_input_t * input, va_list * args);
181 extern cnat_timestamp_t *cnat_timestamps;
182 extern fib_source_t cnat_fib_source;
183 extern cnat_main_t cnat_main;
185 extern char *cnat_error_strings[];
189 #define cnat_error(n,s) CNAT_ERROR_##n,
190 #include <cnat/cnat_error.def>
195 typedef enum cnat_scanner_cmd_t_
199 } cnat_scanner_cmd_t;
202 * Lazy initialization when first adding a translation
205 extern void cnat_lazy_init ();
208 * Enable/Disable session cleanup
210 extern void cnat_enable_disable_scanner (cnat_scanner_cmd_t event_type);
213 * Resolve endpoint address
215 extern u8 cnat_resolve_ep (cnat_endpoint_t * ep);
216 extern u8 cnat_resolve_addr (u32 sw_if_index, ip_address_family_t af,
217 ip_address_t * addr);
221 * fd.io coding-style-patch-verification: ON
224 * eval: (c-set-style "gnu")