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/*
 * Copyright (c) 2018 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 <plugins/gbp/gbp_ext_itf.h>
#include <plugins/gbp/gbp_bridge_domain.h>
#include <plugins/gbp/gbp_route_domain.h>
#include <plugins/gbp/gbp_itf.h>

/**
 * Pool of GBP ext_itfs
 */
gbp_ext_itf_t *gbp_ext_itf_pool;

/**
 * external interface configs keyed by sw_if_index
 */
index_t *gbp_ext_itf_db;

#define GBP_EXT_ITF_ID 0x00000080

/**
 * logger
 */
vlib_log_class_t gx_logger;

#define GBP_EXT_ITF_DBG(...)                           \
    vlib_log_debug (gx_logger, __VA_ARGS__);

u8 *
format_gbp_ext_itf (u8 * s, va_list * args)
{
  gbp_ext_itf_t *gx = va_arg (*args, gbp_ext_itf_t *);

  return (format (s, "%U in %U",
		  format_gbp_itf, gx->gx_itf,
		  format_gbp_bridge_domain, gx->gx_bd));
}

int
gbp_ext_itf_add (u32 sw_if_index, u32 bd_id, u32 rd_id)
{
  gbp_ext_itf_t *gx;
  index_t gxi;

  vec_validate_init_empty (gbp_ext_itf_db, sw_if_index, INDEX_INVALID);

  gxi = gbp_ext_itf_db[sw_if_index];

  if (INDEX_INVALID == gxi)
    {
      gbp_bridge_domain_t *gb;
      gbp_route_domain_t *gr;
      fib_protocol_t fproto;
      index_t gbi, gri;

      gbi = gbp_bridge_domain_find_and_lock (bd_id);

      if (INDEX_INVALID == gbi)
	return (VNET_API_ERROR_NO_SUCH_ENTRY);

      gri = gbp_route_domain_find_and_lock (rd_id);

      if (INDEX_INVALID == gri)
	{
	  gbp_bridge_domain_unlock (gbi);
	  return (VNET_API_ERROR_NO_SUCH_ENTRY);
	}

      pool_get_zero (gbp_ext_itf_pool, gx);
      gxi = gx - gbp_ext_itf_pool;

      gb = gbp_bridge_domain_get (gbi);
      gr = gbp_route_domain_get (gri);

      gx->gx_bd = gbi;
      gx->gx_rd = gri;

      FOR_EACH_FIB_IP_PROTOCOL (fproto)
      {
	gx->gx_fib_index[fproto] =
	  gr->grd_fib_index[fib_proto_to_dpo (fproto)];
      }

      gx->gx_itf = gbp_itf_add_and_lock (sw_if_index, gb->gb_bd_index);
      gbp_itf_set_l2_input_feature (gx->gx_itf, (gxi | GBP_EXT_ITF_ID),
				    L2INPUT_FEAT_GBP_LPM_CLASSIFY);

      gbp_ext_itf_db[sw_if_index] = gxi;

      GBP_EXT_ITF_DBG ("add: %U", format_gbp_ext_itf, gx);

      return (0);
    }

  return (VNET_API_ERROR_ENTRY_ALREADY_EXISTS);
}

int
gbp_ext_itf_delete (u32 sw_if_index)
{
  gbp_ext_itf_t *gx;
  index_t gxi;

  if (vec_len (gbp_ext_itf_db) <= sw_if_index)
    return (VNET_API_ERROR_INVALID_SW_IF_INDEX);

  gxi = gbp_ext_itf_db[sw_if_index];

  if (INDEX_INVALID != gxi)
    {
      gx = pool_elt_at_index (gbp_ext_itf_pool, gxi);

      GBP_EXT_ITF_DBG ("del: %U", format_gbp_ext_itf, gx);

      gbp_itf_set_l2_input_feature (gx->gx_itf,
				    (gxi | GBP_EXT_ITF_ID),
				    L2INPUT_FEAT_NONE);
      gbp_itf_unlock (gx->gx_itf);

      gbp_route_domain_unlock (gx->gx_rd);
      gbp_bridge_domain_unlock (gx->gx_bd);

      gbp_ext_itf_db[sw_if_index] = INDEX_INVALID;
      pool_put (gbp_ext_itf_pool, gx);

      return (0);
    }
  return (VNET_API_ERROR_NO_SUCH_ENTRY);
}

void
gbp_ext_itf_walk (gbp_ext_itf_cb_t cb, void *ctx)
{
  gbp_ext_itf_t *ge;

  /* *INDENT-OFF* */
  pool_foreach(ge, gbp_ext_itf_pool,
  {
    if (!cb(ge, ctx))
      break;
  });
  /* *INDENT-ON* */
}

static walk_rc_t
gbp_ext_itf_show_one (gbp_ext_itf_t * gx, void *ctx)
{
  vlib_cli_output (ctx, "  %U", format_gbp_ext_itf, gx);

  return (WALK_CONTINUE);
}

static clib_error_t *
gbp_ext_itf_show (vlib_main_t * vm,
		  unformat_input_t * input, vlib_cli_command_t * cmd)
{
  vlib_cli_output (vm, "External-Interfaces:");
  gbp_ext_itf_walk (gbp_ext_itf_show_one, vm);

  return (NULL);
}

/*?
 * Show Group Based Policy external interface and derived information
 *
 * @cliexpar
 * @cliexstart{show gbp ext-itf}
 * @cliexend
 ?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (gbp_ext_itf_show_node, static) = {
  .path = "show gbp ext-itf",
  .short_help = "show gbp ext-itf\n",
  .function = gbp_ext_itf_show,
};
/* *INDENT-ON* */

static clib_error_t *
gbp_ext_itf_init (vlib_main_t * vm)
{
  gx_logger = vlib_log_register_class ("gbp", "ext-itf");

  return (NULL);
}

VLIB_INIT_FUNCTION (gbp_ext_itf_init);

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