/*
 * Copyright (c) 2015 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/ethernet/ethernet.h>

typedef struct
{
  u8 mac_addr[6];
} mac_addr_t;

static clib_error_t *
virtual_ip_cmd_fn_command_fn (vlib_main_t * vm,
			      unformat_input_t * input,
			      vlib_cli_command_t * cmd)
{
  unformat_input_t _line_input, *line_input = &_line_input;
  vnet_main_t *vnm = vnet_get_main ();
  ip4_main_t *im = &ip4_main;
  ip_lookup_main_t *lm = &im->lookup_main;
  ip4_address_t ip_addr, next_hop;
  u8 mac_addr[6];
  mac_addr_t *mac_addrs = 0;
  u32 sw_if_index;
  u32 i, f;

  /* Get a line of input. */
  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  if (!unformat (line_input, "%U %U",
		 unformat_ip4_address, &ip_addr,
		 unformat_vnet_sw_interface, vnm, &sw_if_index))
    goto barf;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "mac %U",
		    unformat_ethernet_address, &mac_addr))
	{
	  mac_addr_t *ma;
	  vec_add2 (mac_addrs, ma, 1);
	  clib_memcpy (ma, mac_addr, sizeof (mac_addr));
	}
      else
	{
	barf:
	  return clib_error_return (0, "unknown input `%U'",
				    format_unformat_error, input);
	}
    }
  if (vec_len (mac_addrs) == 0)
    goto barf;

  /* Create / delete special interface route /32's */
  next_hop.as_u32 = 0;

  for (i = 0; i < vec_len (mac_addrs); i++)
    {
      ip_adjacency_t adj;
      u32 adj_index;

      memset (&adj, 0, sizeof (adj));
      adj.lookup_next_index = IP_LOOKUP_NEXT_REWRITE;

      vnet_rewrite_for_sw_interface (vnm, VNET_L3_PACKET_TYPE_IP4, sw_if_index, ip4_rewrite_node.index, &mac_addrs[i],	/* destination address */
				     &adj.rewrite_header,
				     sizeof (adj.rewrite_data));

      ip_add_adjacency (lm, &adj, 1 /* one adj */ ,
			&adj_index);

      f =
	(i + 1 < vec_len (mac_addrs)) ? IP4_ROUTE_FLAG_NOT_LAST_IN_GROUP : 0;
      ip4_add_del_route_next_hop (im, IP4_ROUTE_FLAG_ADD | f, &ip_addr,
				  32 /* insert /32's */ ,
				  &next_hop, sw_if_index, 1 /* weight */ ,
				  adj_index,
				  (u32) ~ 0 /* explicit fib index */ );
    }

  vec_free (mac_addrs);

  return 0;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (virtual_ip_cmd_fn_command, static) = {
  .path = "ip virtual",
  .short_help = "ip virtual <addr> <interface> [mac <Mi>]+",
  .function = virtual_ip_cmd_fn_command_fn,
};
/* *INDENT-ON* */

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