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_TRANSLATION_H__
17 #define __CNAT_TRANSLATION_H__
19 #include <cnat/cnat_types.h>
20 #include <vnet/ip/ip_types.h>
21 #include <vppinfra/bihash_8_8.h>
24 * Counters for each translation
26 extern vlib_combined_counter_main_t cnat_translation_counters;
28 typedef enum cnat_trk_flag_t_
30 CNAT_TRK_ACTIVE = (1 << 0),
34 * Data used to track an EP in the FIB
36 typedef struct cnat_ep_trk_t_
39 * The EP being tracked
41 cnat_endpoint_t ct_ep[VLIB_N_DIR];
44 * The FIB entry for the EP
46 fib_node_index_t ct_fei;
49 * The sibling on the entry's child list
54 * The forwarding contributed by the entry
59 * Allows to disable if not resolved yet
61 u8 ct_flags; /* cnat_trk_flag_t */
64 typedef enum cnat_translation_flag_t_
66 /* Do allocate a source port */
67 CNAT_TRANSLATION_FLAG_ALLOCATE_PORT = (1 << 0),
68 /* Has this translation been satcked ?
69 * this allow not being called twice when
70 * with more then FIB_PATH_LIST_POPULAR backends */
71 CNAT_TRANSLATION_STACKED = (1 << 1),
72 } cnat_translation_flag_t;
77 CNAT_RESOLV_ADDR_BACKEND,
78 CNAT_RESOLV_ADDR_SNAT,
79 CNAT_RESOLV_ADDR_TRANSLATION,
80 CNAT_ADDR_N_RESOLUTIONS,
81 } cnat_addr_resol_type_t;
84 * Entry used to account for a translation's backend
85 * waiting for address resolution
87 typedef struct addr_resolution_t_
90 * The interface index to resolve
94 * ip4 or ip6 resolution
96 ip_address_family_t af;
98 * The cnat_addr_resolution_t
100 cnat_addr_resol_type_t type;
112 * A Translation represents the translation of a VEP to one of a set
113 * of real server addresses
115 typedef struct cnat_translation_t_
118 * Linkage into the FIB graph
123 * The LB used to forward to the backends
128 * The Virtual end point
130 cnat_endpoint_t ct_vip;
133 * The vector of tracked back-ends
135 cnat_ep_trk_t *ct_paths;
138 * The vector of active tracked back-ends
140 cnat_ep_trk_t *ct_active_paths;
143 * The ip protocol for the translation
145 ip_protocol_t ct_proto;
148 * The client object this translation belongs on
149 * INDEX_INVALID if vip is unresolved
154 * Own index (if copied for trace)
162 } cnat_translation_t;
164 extern cnat_translation_t *cnat_translation_pool;
166 extern u8 *format_cnat_translation (u8 * s, va_list * args);
169 * create or update a translation
171 * @param vip The Virtual Endpoint
172 * @param ip_proto The ip protocol to translate
173 * @param backends the backends to choose from
175 * @return the ID of the translation. used to delete and gather stats
177 extern u32 cnat_translation_update (cnat_endpoint_t * vip,
178 ip_protocol_t ip_proto,
179 cnat_endpoint_tuple_t *
183 * Delete a translation
185 * @param id the ID as returned from the create
187 extern int cnat_translation_delete (u32 id);
190 * Callback function invoked during a walk of all translations
192 typedef walk_rc_t (*cnat_translation_walk_cb_t) (index_t index, void *ctx);
195 * Walk/visit each of the translations
197 extern void cnat_translation_walk (cnat_translation_walk_cb_t cb, void *ctx);
200 * Purge all the trahslations
202 extern int cnat_translation_purge (void);
205 * Add an address resolution request
207 extern void cnat_translation_watch_addr (index_t cti, u64 opaque,
208 cnat_endpoint_t * ep,
209 cnat_addr_resol_type_t type);
212 * Cleanup matching addr resolution requests
214 extern void cnat_translation_unwatch_addr (u32 cti,
215 cnat_addr_resol_type_t type);
218 * Data plane functions
220 extern clib_bihash_8_8_t cnat_translation_db;
222 static_always_inline cnat_translation_t *
223 cnat_translation_get (index_t cti)
225 return (pool_elt_at_index (cnat_translation_pool, cti));
228 static_always_inline cnat_translation_t *
229 cnat_find_translation (index_t cti, u16 port, ip_protocol_t proto)
231 clib_bihash_kv_8_8_t bkey, bvalue;
235 key = ((u64) proto << 24) | port;
236 key = key << 32 | (u32) cti;
239 rv = clib_bihash_search_inline_2_8_8 (&cnat_translation_db, &bkey, &bvalue);
241 return (pool_elt_at_index (cnat_translation_pool, bvalue.value));
247 * fd.io coding-style-patch-verification: ON
250 * eval: (c-set-style "gnu")