extras/strongswan/vpp_sswan/kernel_vpp_shared.h

#ifndef KERNEL_VPP_SHARED_H_
#define KERNEL_VPP_SHARED_H_
/*
 * Copyright (c) 2022 Intel 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.
 */

/**
 * Every 2 seconds, the thread responsible for collecting the available
 * interfaces will be executed.
 * Retrying 5 times every 1 second ensures that there is enough time to check
 * if the interface will be available.
 */
#define N_RETRY_GET_IF 5

typedef struct vac_t vac_t;

/**
 * Callback function invoked for received event messages.
 *
 * @param data     associated event message, destroyed by VPP API wrapper
 * @param data_len length of the event message
 * @param ctx      user data, as passed to register_event
 */
typedef void (*event_cb_t) (char *data, int data_len, void *ctx);

/**
 * Wrapper around VPP binary API client.
 */
struct vac_t
{

  /**
   * Destroy the VPP API client.
   */
  void (*destroy) (vac_t *this);

  /**
   * Send VPP API message and wait for a reply
   *
   * @param in      VPP API message to send
   * @param in_len  length of the message to send
   * @param out     received VPP API message
   * @param out_len length of the received message
   */
  status_t (*send) (vac_t *this, char *in, int in_len, char **out,
		    int *out_len);

  /**
   * Send VPP API dump message and wait for a reply.
   *
   * @param in      VPP API message to send
   * @param in_len  length of the message to send
   * @param out     received VPP API message
   * @param out_len length of the received message
   */
  status_t (*send_dump) (vac_t *this, char *in, int in_len, char **out,
			 int *out_len);

  /**
   * Register for VPP API event of a given kind.
   *
   * @param in       VPP API event message to register
   * @param in_len   length of the event message to register
   * @param cb       callback function to register
   * @param event_id event ID
   * @param ctx      user data passed to callback invocations
   */
  status_t (*register_event) (vac_t *this, char *in, int in_len, event_cb_t cb,
			      uint16_t event_id, void *ctx);
};

extern vac_t *vac;

/**
 * Establishing a binary API connection to VPP.
 *
 * @param name client name
 * @return     vac_t instance
 */
vac_t *vac_create (char *name);

#endif /* KERNEL_VPP_SHARED_H_ */