/* * Copyright (c) 2016 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. */ /** * A Delagate is a means to implement the Delagation design pattern; * the extension of an object's functionality through the composition of, * and delgation to, other objects. * These 'other' objects are delegates. Delagates are thus attached to * ADJ objects to extend their functionality. */ #ifndef __ADJ_DELEGATE_T__ #define __ADJ_DELEGATE_T__ #include <vnet/adj/adj.h> /** * Built-in delegate types. * When adding new types, if your code is within the vnet subsystem, then add a * new type here. If not then use the adj_delegate_register_new_type API to * register a new type. */ typedef enum adj_delegate_type_t_ { /** * BFD session state */ ADJ_DELEGATE_BFD, /** * Stacking of a midchain's nexthop */ ADJ_DELEGATE_MIDCHAIN, } adj_delegate_type_t; #define ADJ_DELEGATE_LAST (ADJ_DELEGATE_MIDCHAIN) /** * Adj delegate. This object is attached to the adjacency. */ typedef struct adj_delegate_t_ { /** * The ADJ entry object to which the delagate is attached */ adj_index_t ad_adj_index; /** * The delagate type */ adj_delegate_type_t ad_type; /** * The index passed by the provider to identify its delegate instance. * As with all things VPP this is a pool index. */ index_t ad_index; } adj_delegate_t; /** * Indication that the adjacency has been deleted. The delegate provider should free * the delegate. */ typedef void (*adj_delegate_adj_deleted_t)(adj_delegate_t *aed); /** * Format function for the delegate */ typedef u8 * (*adj_delegate_format_t)(const adj_delegate_t *aed, u8 *s); /** * An ADJ delegate virtual function table */ typedef struct adj_delegate_vft_t_ { adj_delegate_format_t adv_format; adj_delegate_adj_deleted_t adv_adj_deleted; } adj_delegate_vft_t; /** * @brief Remove a delegate from an adjacency * * @param ai The adjacency to remove the delegate from * @param type The type of delegate being removed */ extern void adj_delegate_remove(adj_index_t ai, adj_delegate_type_t type); /** * @brief Add a delegate to an adjacency * * @param ai The adjacency to add the delegate to * @param type The type of delegate being added * @param adi The provider's [pool] index of its attached objet */ extern int adj_delegate_add(ip_adjacency_t *adj, adj_delegate_type_t fdt, index_t adi); /** * @brief Get a delegate from an adjacency * * @param ai The adjacency to get the delegate from * @param type The type of delegate being sought */ extern adj_delegate_t *adj_delegate_get(const ip_adjacency_t *adj, adj_delegate_type_t type); /** * @brief Register a VFT for one of the built-in types */ extern void adj_delegate_register_type(adj_delegate_type_t type, const adj_delegate_vft_t *vft); /** * @brief create a new delegate type and register a new VFT */ extern adj_delegate_type_t adj_delegate_register_new_type( const adj_delegate_vft_t *vft); #endif