/*
 * Copyright (c) 2017 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.
 */

#include <vnet/ip/ip.h>
#include <vnet/plugin/plugin.h>
#include <vnet/udp/udp_local.h>
#include <ioam/ipfixcollector/ipfixcollector.h>

ipfix_collector_main_t ipfix_collector_main;

/**
 * @brief IP-FIX SetID registration function.
 *
 * This function can be used by other VPP graph nodes to receive IP-FIX packets
 * with a particular setid.
 *
 * @param vm Vlib main of the graph node which is interested in
 *                    getting IP-Fix packet.
 * @param info Structure describing the client node which
 *                               is interested in getting the IP-Fix packets for
 *                               a SetID.
 *
 * @returns 0 on success.
 * @returns Error codes(<0) otherwise.
 */
int
ipfix_collector_reg_setid (vlib_main_t * vm, ipfix_client_add_del_t * info)
{
  ipfix_collector_main_t *cm = &ipfix_collector_main;
  uword *p = NULL;
  int i;
  ipfix_client *client = 0;

  if ((!info) || (!info->client_name))
    return IPFIX_COLLECTOR_ERR_INVALID_PARAM;

  p = hash_get (cm->client_reg_table, info->ipfix_setid);
  client = p ? pool_elt_at_index (cm->client_reg_pool, (*p)) : NULL;

  if (info->del)
    {
      if (!client)
	return 0;		//There is no registered handler, so send success

      hash_unset (cm->client_reg_table, info->ipfix_setid);
      vec_free (client->client_name);
      pool_put (cm->client_reg_pool, client);
      return 0;
    }

  if (client)
    return IPFIX_COLLECTOR_ERR_REG_EXISTS;

  pool_get (cm->client_reg_pool, client);
  i = client - cm->client_reg_pool;
  client->client_name = vec_dup (info->client_name);
  client->client_node = info->client_node;
  client->client_next_node = vlib_node_add_next (vm,
						 ipfix_collector_node.index,
						 client->client_node);
  client->set_id = info->ipfix_setid;

  hash_set (cm->client_reg_table, info->ipfix_setid, i);

  if (!udp_is_valid_dst_port (UDP_DST_PORT_ipfix, 1))
    udp_register_dst_port (vm, UDP_DST_PORT_ipfix,
			   ipfix_collector_node.index, 1);

  return 0;
}

static clib_error_t *
ipfix_collector_init (vlib_main_t * vm)
{
  clib_error_t *error = 0;
  ipfix_collector_main_t *cm = &ipfix_collector_main;

  cm->vlib_main = vm;
  cm->vnet_main = vnet_get_main ();

  cm->client_reg_pool = NULL;
  cm->client_reg_table = hash_create (0, sizeof (uword));

  return error;
}

VLIB_INIT_FUNCTION (ipfix_collector_init);

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */