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>
25 /* only in the default table for v4 and v6 */
26 #define CNAT_FIB_TABLE 0
28 /* default lifetime of NAT sessions (seconds) */
29 #define CNAT_DEFAULT_SESSION_MAX_AGE 30
30 /* lifetime of TCP conn NAT sessions after SYNACK (seconds) */
31 #define CNAT_DEFAULT_TCP_MAX_AGE 3600
32 /* lifetime of TCP conn NAT sessions after RST/FIN (seconds) */
33 #define CNAT_DEFAULT_TCP_RST_TIMEOUT 5
34 #define CNAT_DEFAULT_SCANNER_TIMEOUT (1.0)
36 #define CNAT_DEFAULT_SESSION_BUCKETS 1024
37 #define CNAT_DEFAULT_TRANSLATION_BUCKETS 1024
38 #define CNAT_DEFAULT_SNAT_BUCKETS 1024
40 #define CNAT_DEFAULT_SESSION_MEMORY (1 << 20)
41 #define CNAT_DEFAULT_TRANSLATION_MEMORY (256 << 10)
42 #define CNAT_DEFAULT_SNAT_MEMORY (64 << 20)
44 /* This should be strictly lower than FIB_SOURCE_INTERFACE
45 * from fib_source.h */
46 #define CNAT_FIB_SOURCE_PRIORITY 0x02
48 /* Initial refcnt for timestamps (2 : session & rsession) */
49 #define CNAT_TIMESTAMP_INIT_REFCNT 2
51 #define MIN_SRC_PORT ((u16) 0xC000)
55 /* Endpoint addr has been resolved */
56 CNAT_EP_FLAG_RESOLVED = 1,
59 typedef struct cnat_endpoint_t_
67 typedef struct cnat_endpoint_tuple_t_
69 cnat_endpoint_t dst_ep;
70 cnat_endpoint_t src_ep;
71 } cnat_endpoint_tuple_t;
81 u32 dst_address_length_refcounts[129];
82 u16 *prefix_lengths_in_search_order;
83 uword *non_empty_dst_address_length_bitmap;
84 } cnat_snat_pfx_table_meta_t;
88 /* Stores (ip family, prefix & mask) */
89 clib_bihash_24_8_t ip_hash;
90 /* family dependant cache */
91 cnat_snat_pfx_table_meta_t meta[2];
92 /* Precomputed ip masks (ip4 & ip6) */
93 ip6_address_t ip_masks[129];
94 } cnat_snat_pfx_table_t;
96 typedef struct cnat_main_
98 /* Memory size of the session bihash */
99 uword session_hash_memory;
101 /* Number of buckets of the session bihash */
102 u32 session_hash_buckets;
104 /* Memory size of the translation bihash */
105 uword translation_hash_memory;
107 /* Number of buckets of the translation bihash */
108 u32 translation_hash_buckets;
110 /* Memory size of the source NAT prefix bihash */
111 uword snat_hash_memory;
113 /* Number of buckets of the source NAT prefix bihash */
114 u32 snat_hash_buckets;
116 /* Timeout after which to clear sessions (in seconds) */
119 /* Timeout after which to clear an established TCP
120 * session (in seconds) */
123 /* delay in seconds between two scans of session/clients tables */
126 /* Lock for the timestamp pool */
127 clib_rwlock_t ts_lock;
129 /* Ip4 Address to use for source NATing */
130 cnat_endpoint_t snat_ip4;
132 /* Ip6 Address to use for source NATing */
133 cnat_endpoint_t snat_ip6;
135 /* Longest prefix Match table for source NATing */
136 cnat_snat_pfx_table_t snat_pfx_table;
138 /* Index of the scanner process node */
139 uword scanner_node_index;
141 /* Did we do lazy init ? */
144 /* Enable or Disable the scanner on startup */
145 u8 default_scanner_state;
148 typedef struct cnat_timestamp_t_
150 /* Last time said session was seen */
152 /* expire after N seconds */
154 /* Users refcount, initially 3 (session, rsession, dpo) */
158 typedef struct cnat_node_ctx_
163 ip_address_family_t af;
167 cnat_main_t *cnat_get_main ();
168 extern u8 *format_cnat_endpoint (u8 * s, va_list * args);
169 extern uword unformat_cnat_ep_tuple (unformat_input_t * input,
171 extern uword unformat_cnat_ep (unformat_input_t * input, va_list * args);
172 extern cnat_timestamp_t *cnat_timestamps;
173 extern fib_source_t cnat_fib_source;
174 extern cnat_main_t cnat_main;
175 extern throttle_t cnat_throttle;
177 extern char *cnat_error_strings[];
181 #define cnat_error(n,s) CNAT_ERROR_##n,
182 #include <cnat/cnat_error.def>
187 typedef enum cnat_scanner_cmd_t_
191 } cnat_scanner_cmd_t;
194 * Lazy initialization when first adding a translation
197 extern void cnat_lazy_init ();
200 * Enable/Disable session cleanup
202 extern void cnat_enable_disable_scanner (cnat_scanner_cmd_t event_type);
205 * Resolve endpoint address
207 extern u8 cnat_resolve_ep (cnat_endpoint_t * ep);
208 extern u8 cnat_resolve_addr (u32 sw_if_index, ip_address_family_t af,
209 ip_address_t * addr);
213 * fd.io coding-style-patch-verification: ON
216 * eval: (c-set-style "gnu")