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/*
* Copyright (c) 2021 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 __HICN_STRATEGY_DPO_MANAGER_H__
#define __HICN_STRATEGY_DPO_MANAGER_H__
#include "strategy_dpo_ctx.h"
#include "strategy.h"
/**
* @file strategy_dpo_manager.h
*
* This file implements structs and helper functions to manipulate hICN dpo.
* An hICN DPO is a combination of:
* - a hICN DPO ctx (context) that holds the structure containing the
* information to choose the next hop,
* - a dpo vft that specify how to update the hICN DPO ctx when a next hop is
* added, deleted or updated,
* - a strategy containing (see strategy.h): (i) the vpp node that processes
* Interest packets subjected to such strategy, (ii) the definition of the vft
* that defines the hICN strategy functions An hICN DPO is places as the sole
* next hop in the vpp loadbalancer, and it containes a list of next hops that
* will be used by the associated strategy when forwarding interest packets.
*/
/**
* @brief Definition of the virtual function table for a hICN DPO.
*
* The following virtual function table
* template that glues together the fuction to interact with the context and
* the creating the dpo
*/
typedef struct hicn_dpo_vft_s
{
int (*hicn_dpo_is_type) (const dpo_id_t *dpo);
/**< Check if the type of the
hICN DPO is the expected */
dpo_type_t (*hicn_dpo_get_type) (void);
/**< Return the type of the hICN dpo */
void (*hicn_dpo_module_init) (void); /**< Initialize the hICN dpo */
void (*hicn_dpo_create) (
fib_protocol_t proto, const hicn_face_id_t *nh, int nh_len,
index_t *dpo_idx); /**< Create the context of the hICN dpo */
void (*hicn_dpo_update_type) (
hicn_dpo_ctx_t *hicn_strategy_ctx); /**change dpo type */
int (*hicn_dpo_add_update_nh) (
hicn_face_id_t nh,
index_t dpo_idx); /**< Add a next hop to the hICN dpo context */
int (*hicn_dpo_del_nh) (hicn_face_id_t face_id, index_t dpo_idx);
u8 *(*hicn_dpo_format) (u8 *s, int, ...);
/**< Format an hICN dpo*/
} hicn_dpo_vft_t;
/*
* Default dpo to be used to create fib entry when a strategy is not
* specified
*/
extern hicn_dpo_vft_t default_dpo;
/**
* @brief Register a new hICN dpo to the manager.
*
* Registering a hICN DPO allows the plugin to be aware of the new dpo an be
* able to apply it to the FIB entries.
*
* @param hicn_nodes A list of vpp to which pass an interest that matches with
* the FIB entry to which the hICN DPO is applied. This list must contain the
* name of the strategy node (or nodes in case of differentiation between IPv4
* and IPv6). Unless really needed otherwise (i.e., different implementation of
* iface input), the list of node to use should be one provided in the
* strategy.h (hicn_nodes_strategy)
* @param hicn_dpo_vft The structure holding the virtual function table to
* interact with the hICN dpo and its context.
* @param hicn_strategy_vft The structure holding the virtual function table
* containing the hICN strategy functions.
* @return the dpo type registered in the VPP Data plane graph.
*/
dpo_type_t hicn_dpo_register_new_type (
const char *const *const *hicn_nodes, const hicn_dpo_vft_t *hicn_dpo_vft,
const hicn_strategy_vft_t *hicn_strategy_vft, const dpo_vft_t *dpo_ctx_vft);
/**
* @brief Check if the type of the dpo is among the list of hicn dpo types
*
* Iterate through the list of dpo types registered in the hicn dpo manager.
*
* @param dpo The id of the dpo to which check the type
* @return 1 if there is a match, 0 otherwise.
*/
u32 dpo_is_hicn (const dpo_id_t *dpo);
/**
* @brief Return the dpo_vtf and strategy_vtf identifier
*
* Iterate through the list of dpo types registered in the hicn dpo manager and
* retrieve the corresponding dpo_vtf/strategy_vtf identifier.
*
* @param dpo The id of the dpo to which check the type
* @return the dpo_vft/strategy_vft id or HICN_ERROR_DPO_NOT_FOUND in case the
* dpo is not an hICN dpo.
*/
u8 hicn_dpo_get_vft_id (const dpo_id_t *dpo);
/**
* @brief Get the vft to manage the dpo context.
*
* @param The id of the hicn_dpo_vft to retrieve.
* @return The vft struct that contains the list of callbacks that allows to
* manage the dpo context.
*/
const hicn_dpo_vft_t *hicn_dpo_get_vft (dpo_type_t vfts_id);
/**
* @brief Get the vft to manage the dpo context from the strategy id.
*
* @param The strategy id of the hicn_dpo_vft to retrieve.
* @return The vft struct that contains the list of callbacks that allows to
* manage the dpo context.
*/
const hicn_dpo_vft_t *hicn_dpo_get_vft_from_id (u8 strategy_id);
/**
* @brief Get the vft with the hICN strategy functions.
*
* @param The id of the hicn_strategy_vft to retrieve.
* @return The vft struct that contains the list hICN strategy functions.
*/
const hicn_strategy_vft_t *hicn_dpo_get_strategy_vft (dpo_type_t vfts_id);
/**
* @brief Get the vft with the hICN strategy functions from the strategy id.
*
* @param The id of the hicn_strategy_vft to retrieve.
* @return The vft struct that contains the list hICN strategy functions.
*/
const hicn_strategy_vft_t *hicn_dpo_get_strategy_vft_from_id (u8 vfts_id);
/**
* @brief Initialize all the types hicn dpo registered
*
* Call the init functions of all the hicn dpo implemented.
* This init is called when the plugin bootstrap.
*/
void hicn_dpos_init (void);
/**
* @brief Print the list of the registered hICN DPO
*
* @param s String to which to append the list of hICN DPO (strategies)
* @param n number of parameters to pass
*
* @result The string with the list of hICN DPO (strategies)
*/
u8 *format_hicn_strategy_list (u8 *s, int n, ...);
/**
* @brief Check if a given id points to a strategy and the corresponding dpo
* ctx
*
* @param The id of the strategy to check.
*
* @result HICN_ERROR_NONE is the id is valid, otherwise EINVAL
*/
int hicn_dpo_strategy_id_is_valid (int strategy_id);
/**
* @brief Return the number of available strategies. This number can be used to
* as an upperbond for valid vfts_id.
*
* @result Return the number of available strategies.
*/
int hicn_strategy_get_all_available (void);
/**
* @brief Registers a module at compilation time to be initialized as part of
* the ctor.
*/
void hicn_dpo_register (const hicn_dpo_vft_t *hicn_dpo);
#endif /* // __HICN_STRATEGY_DPO_MANAGER_H__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables: eval: (c-set-style "gnu") End:
*/
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