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;
29 * Data used to track an EP in the FIB
31 typedef struct cnat_ep_trk_t_
34 * The EP being tracked
36 cnat_endpoint_t ct_ep[VLIB_N_DIR];
39 * The FIB entry for the EP
41 fib_node_index_t ct_fei;
44 * The sibling on the entry's child list
49 * The forwarding contributed by the entry
54 * Allows to disable if not resolved yet
59 typedef enum cnat_translation_flag_t_
61 CNAT_TRANSLATION_FLAG_ALLOCATE_PORT = (1 << 0),
62 } cnat_translation_flag_t;
67 CNAT_RESOLV_ADDR_BACKEND,
68 CNAT_RESOLV_ADDR_SNAT,
69 CNAT_RESOLV_ADDR_TRANSLATION,
70 CNAT_ADDR_N_RESOLUTIONS,
71 } cnat_addr_resol_type_t;
74 * Entry used to account for a translation's backend
75 * waiting for address resolution
77 typedef struct addr_resolution_t_
80 * The interface index to resolve
84 * ip4 or ip6 resolution
86 ip_address_family_t af;
88 * The cnat_addr_resolution_t
90 cnat_addr_resol_type_t type;
102 * A Translation represents the translation of a VEP to one of a set
103 * of real server addresses
105 typedef struct cnat_translation_t_
108 * Linkage into the FIB graph
113 * The LB used to forward to the backends
118 * The Virtual end point
120 cnat_endpoint_t ct_vip;
123 * The vector of tracked back-ends
125 cnat_ep_trk_t *ct_paths;
128 * The ip protocol for the translation
130 ip_protocol_t ct_proto;
133 * The client object this translation belongs on
134 * INDEX_INVALID if vip is unresolved
139 * Own index (if copied for trace)
147 } cnat_translation_t;
149 extern cnat_translation_t *cnat_translation_pool;
151 extern u8 *format_cnat_translation (u8 * s, va_list * args);
154 * create or update a translation
156 * @param vip The Virtual Endpoint
157 * @param ip_proto The ip protocol to translate
158 * @param backends the backends to choose from
160 * @return the ID of the translation. used to delete and gather stats
162 extern u32 cnat_translation_update (cnat_endpoint_t * vip,
163 ip_protocol_t ip_proto,
164 cnat_endpoint_tuple_t *
168 * Delete a translation
170 * @param id the ID as returned from the create
172 extern int cnat_translation_delete (u32 id);
175 * Callback function invoked during a walk of all translations
177 typedef walk_rc_t (*cnat_translation_walk_cb_t) (index_t index, void *ctx);
180 * Walk/visit each of the translations
182 extern void cnat_translation_walk (cnat_translation_walk_cb_t cb, void *ctx);
185 * Purge all the trahslations
187 extern int cnat_translation_purge (void);
190 * Add an address resolution request
192 extern void cnat_translation_watch_addr (index_t cti, u64 opaque,
193 cnat_endpoint_t * ep,
194 cnat_addr_resol_type_t type);
197 * Cleanup matching addr resolution requests
199 extern void cnat_translation_unwatch_addr (u32 cti,
200 cnat_addr_resol_type_t type);
203 * Data plane functions
205 extern clib_bihash_8_8_t cnat_translation_db;
207 static_always_inline cnat_translation_t *
208 cnat_translation_get (index_t cti)
210 return (pool_elt_at_index (cnat_translation_pool, cti));
213 static_always_inline cnat_translation_t *
214 cnat_find_translation (index_t cti, u16 port, ip_protocol_t proto)
216 clib_bihash_kv_8_8_t bkey, bvalue;
220 key = (proto << 24) | port;
221 key = key << 32 | (u32) cti;
224 rv = clib_bihash_search_inline_2_8_8 (&cnat_translation_db, &bkey, &bvalue);
226 return (pool_elt_at_index (cnat_translation_pool, bvalue.value));
232 * fd.io coding-style-patch-verification: ON
235 * eval: (c-set-style "gnu")