/* * 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