/*
 * Copyright (c) 2017 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.
 */

#include <vat/vat.h>
#include <vlibapi/api.h>
#include <vlibmemory/api.h>

#include <vppinfra/error.h>
#include <pppoe/pppoe.h>

#define __plugin_msg_base pppoe_test_main.msg_id_base
#include <vlibapi/vat_helper_macros.h>


uword unformat_ip46_address (unformat_input_t * input, va_list * args)
{
  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
  ip46_type_t type = va_arg (*args, ip46_type_t);
  if ((type != IP46_TYPE_IP6) &&
      unformat(input, "%U", unformat_ip4_address, &ip46->ip4)) {
    ip46_address_mask_ip4(ip46);
    return 1;
  } else if ((type != IP46_TYPE_IP4) &&
      unformat(input, "%U", unformat_ip6_address, &ip46->ip6)) {
    return 1;
  }
  return 0;
}
uword unformat_ip46_prefix (unformat_input_t * input, va_list * args)
{
  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
  u8 *len = va_arg (*args, u8 *);
  ip46_type_t type = va_arg (*args, ip46_type_t);

  u32 l;
  if ((type != IP46_TYPE_IP6) && unformat(input, "%U/%u", unformat_ip4_address, &ip46->ip4, &l)) {
    if (l > 32)
      return 0;
    *len = l + 96;
    ip46->pad[0] = ip46->pad[1] = ip46->pad[2] = 0;
  } else if ((type != IP46_TYPE_IP4) && unformat(input, "%U/%u", unformat_ip6_address, &ip46->ip6, &l)) {
    if (l > 128)
      return 0;
    *len = l;
  } else {
    return 0;
  }
  return 1;
}
/////////////////////////

#define vl_msg_id(n,h) n,
typedef enum {
#include <pppoe/pppoe.api.h>
    /* We'll want to know how many messages IDs we need... */
    VL_MSG_FIRST_AVAILABLE,
} vl_msg_id_t;
#undef vl_msg_id

/* define message structures */
#define vl_typedefs
#include <pppoe/pppoe.api.h>
#undef vl_typedefs

/* declare message handlers for each api */

#define vl_endianfun             /* define message structures */
#include <pppoe/pppoe.api.h>
#undef vl_endianfun

/* instantiate all the print functions we know about */
#define vl_print(handle, ...)
#define vl_printfun
#include <pppoe/pppoe.api.h>
#undef vl_printfun

/* Get the API version number. */
#define vl_api_version(n,v) static u32 api_version=(v);
#include <pppoe/pppoe.api.h>
#undef vl_api_version

typedef struct {
    /* API message ID base */
    u16 msg_id_base;
    vat_main_t *vat_main;
} pppoe_test_main_t;

pppoe_test_main_t pppoe_test_main;

static void vl_api_pppoe_add_del_session_reply_t_handler
  (vl_api_pppoe_add_del_session_reply_t * mp)
{
  vat_main_t *vam = &vat_main;
  i32 retval = ntohl (mp->retval);
  if (vam->async_mode)
    {
      vam->async_errors += (retval < 0);
    }
  else
    {
      vam->retval = retval;
      vam->sw_if_index = ntohl (mp->sw_if_index);
      vam->result_ready = 1;
    }
}


/*
 * Table of message reply handlers, must include boilerplate handlers
 * we just generated
 */
#define foreach_vpe_api_reply_msg                               \
  _(PPPOE_ADD_DEL_SESSION_REPLY, pppoe_add_del_session_reply)               \
  _(PPPOE_SESSION_DETAILS, pppoe_session_details)


static int
api_pppoe_add_del_session (vat_main_t * vam)
{
  unformat_input_t *line_input = vam->input;
  vl_api_pppoe_add_del_session_t *mp;
  u16 session_id = 0;
  ip46_address_t client_ip;
  u8 is_add = 1;
  u8 client_ip_set = 0;
  u8 ipv4_set = 0;
  u8 ipv6_set = 0;
  u32 decap_vrf_id = 0;
  u8 client_mac[6] = { 0 };
  u8 client_mac_set = 0;
  int ret;

  /* Can't "universally zero init" (={0}) due to GCC bug 53119 */
  memset (&client_ip, 0, sizeof client_ip);

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "del"))
	{
	  is_add = 0;
	}
      else if (unformat (line_input, "session_id %d", &session_id))
	;
      else if (unformat (line_input, "client-ip %U",
			 unformat_ip4_address, &client_ip.ip4))
	{
	  client_ip_set = 1;
	  ipv4_set = 1;
	}
      else if (unformat (line_input, "client-ip %U",
			 unformat_ip6_address, &client_ip.ip6))
	{
	  client_ip_set = 1;
	  ipv6_set = 1;
	}
      else if (unformat (line_input, "decap-vrf-id %d", &decap_vrf_id))
        ;
      else if (unformat (line_input, "client-mac %U", unformat_ethernet_address, client_mac))
	client_mac_set = 1;
      else
	{
	  return -99;
	}
    }

  if (client_ip_set == 0)
    {
      errmsg ("session client_ip address not specified");
      return -99;
    }

  if (ipv4_set && ipv6_set)
    {
      errmsg ("both IPv4 and IPv6 addresses specified");
      return -99;
    }

  if (client_mac_set == 0)
    {
      errmsg("session client mac not specified");
      return -99;
    }

  M (PPPOE_ADD_DEL_SESSION, mp);

  if (ipv6_set)
    {
      clib_memcpy (mp->client_ip, &client_ip.ip6, sizeof (client_ip.ip6));
    }
  else
    {
      clib_memcpy (mp->client_ip, &client_ip.ip4, sizeof (client_ip.ip4));
    }

  mp->decap_vrf_id = ntohl (decap_vrf_id);
  mp->session_id = ntohl (session_id);
  mp->is_add = is_add;
  mp->is_ipv6 = ipv6_set;
  memcpy (mp->client_mac, client_mac, 6);

  S (mp);
  W (ret);
  return ret;
}

static void vl_api_pppoe_session_details_t_handler
  (vl_api_pppoe_session_details_t * mp)
{
  vat_main_t *vam = &vat_main;
  ip46_address_t client_ip = to_ip46 (mp->is_ipv6, mp->client_ip);

  print (vam->ofp, "%11d%14d%24U%14d%14d%30U%30U",
       ntohl (mp->sw_if_index), ntohl (mp->session_id),
       format_ip46_address, &client_ip, IP46_TYPE_ANY,
       ntohl (mp->encap_if_index), ntohl (mp->decap_vrf_id),
       format_ethernet_address, mp->local_mac,
       format_ethernet_address, mp->client_mac);
}

static int
api_pppoe_session_dump (vat_main_t * vam)
{
  unformat_input_t *i = vam->input;
  vl_api_pppoe_session_dump_t *mp;
  u32 sw_if_index;
  u8 sw_if_index_set = 0;
  int ret;

  /* Parse args required to build the message */
  while (unformat_check_input (i) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (i, "sw_if_index %d", &sw_if_index))
      sw_if_index_set = 1;
      else
      break;
    }

  if (sw_if_index_set == 0)
    {
      sw_if_index = ~0;
    }

  if (!vam->json_output)
    {
      print (vam->ofp, "%11s%24s%14s%14s%14s",
	   "sw_if_index", "client_ip", "session_id",
	   "encap_if_index", "decap_fib_index",
	   "local-mac", "client-mac");
    }

  /* Get list of pppoe-session interfaces */
  M (PPPOE_SESSION_DUMP, mp);

  mp->sw_if_index = htonl (sw_if_index);

  S (mp);

  W (ret);
  return ret;
}

/*
 * List of messages that the api test plugin sends,
 * and that the data plane plugin processes
 */
#define foreach_vpe_api_msg                                            \
_(pppoe_add_del_session,                                                 \
  " client-addr <client-addr> session-id <nn>"                            \
  " [encap-if-index <nn>] [decap-next [ip4|ip6|node <name>]]"             \
  " local-mac <local-mac> client-mac <client-mac> [del]") \
_(pppoe_session_dump, "[<intfc> | sw_if_index <nn>]")                    \

static void
pppoe_vat_api_hookup (vat_main_t *vam)
{
  pppoe_test_main_t * pem = &pppoe_test_main;
  /* Hook up handlers for replies from the data plane plug-in */
#define _(N,n)                                                  \
  vl_msg_api_set_handlers((VL_API_##N + pem->msg_id_base),       \
                          #n,                                   \
                          vl_api_##n##_t_handler,               \
                          vl_noop_handler,                      \
                          vl_api_##n##_t_endian,                \
                          vl_api_##n##_t_print,                 \
                          sizeof(vl_api_##n##_t), 1);
  foreach_vpe_api_reply_msg;
#undef _

  /* API messages we can send */
#define _(n,h) hash_set_mem (vam->function_by_name, #n, api_##n);
  foreach_vpe_api_msg;
#undef _

  /* Help strings */
#define _(n,h) hash_set_mem (vam->help_by_name, #n, h);
  foreach_vpe_api_msg;
#undef _
}

clib_error_t * vat_plugin_register (vat_main_t *vam)
{
  pppoe_test_main_t * pem = &pppoe_test_main;

  u8 * name;

  pem->vat_main = vam;

  /* Ask the vpp engine for the first assigned message-id */
  name = format (0, "pppoe_%08x%c", api_version, 0);
  pem->msg_id_base = vl_client_get_first_plugin_msg_id ((char *) name);

  if (pem->msg_id_base != (u16) ~0)
    pppoe_vat_api_hookup (vam);

  vec_free(name);

  return 0;
}