/*
 *------------------------------------------------------------------
 * ip_api.c - vnet ip api
 *
 * Copyright (c) 2016 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/vnet.h>
#include <vlibmemory/api.h>

#include <vnet/interface.h>
#include <vnet/api_errno.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ethernet/ethernet_types_api.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/ip_types_api.h>
#include <vnet/ip/ip_punt_drop.h>
#include <vnet/ip/ip_types_api.h>
#include <vnet/ip/ip_path_mtu.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/fib_api.h>
#include <vnet/ethernet/arp_packet.h>
#include <vnet/mfib/ip6_mfib.h>
#include <vnet/mfib/ip4_mfib.h>
#include <vnet/mfib/mfib_signal.h>
#include <vnet/mfib/mfib_entry.h>
#include <vnet/mfib/mfib_api.h>
#include <vnet/ip/ip_source_and_port_range_check.h>
#include <vnet/fib/fib_path_list.h>
#include <vnet/ip/ip6_hop_by_hop.h>
#include <vnet/ip/ip6_link.h>
#include <vnet/ip/reass/ip4_sv_reass.h>
#include <vnet/ip/reass/ip4_full_reass.h>
#include <vnet/ip/reass/ip6_sv_reass.h>
#include <vnet/ip/reass/ip6_full_reass.h>
#include <vnet/ip/ip_table.h>
#include <vnet/ip/ip_container_proxy.h>

#include <vnet/format_fns.h>
#include <vnet/ip/ip.api_enum.h>
#include <vnet/ip/ip.api_types.h>

#define REPLY_MSG_ID_BASE ip4_main.msg_id_base
#include <vlibapi/api_helper_macros.h>

static void
  vl_api_sw_interface_ip6_enable_disable_t_handler
  (vl_api_sw_interface_ip6_enable_disable_t * mp)
{
  vl_api_sw_interface_ip6_enable_disable_reply_t *rmp;
  int rv = 0;

  VALIDATE_SW_IF_INDEX (mp);

  rv = ((mp->enable == 1) ?
	ip6_link_enable (ntohl (mp->sw_if_index), NULL) :
	ip6_link_disable (ntohl (mp->sw_if_index)));

  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO (VL_API_SW_INTERFACE_IP6_ENABLE_DISABLE_REPLY);
}

static void
send_ip_table_details (vpe_api_main_t * am,
		       vl_api_registration_t * reg,
		       u32 context, const fib_table_t * table)
{
  vl_api_ip_table_details_t *mp;

  mp = vl_msg_api_alloc (sizeof (*mp));
  if (!mp)
    return;
  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_IP_TABLE_DETAILS);
  mp->context = context;

  mp->table.is_ip6 = (table->ft_proto == FIB_PROTOCOL_IP6);
  mp->table.table_id = htonl (table->ft_table_id);
  memcpy (mp->table.name, table->ft_desc,
	  clib_min (vec_len (table->ft_desc), sizeof (mp->table.name)));

  vl_api_send_msg (reg, (u8 *) mp);
}

static void
vl_api_ip_table_dump_t_handler (vl_api_ip_table_dump_t * mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  vl_api_registration_t *reg;
  fib_table_t *fib_table;

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  pool_foreach (fib_table, ip4_main.fibs)
   {
    send_ip_table_details(am, reg, mp->context, fib_table);
  }
  pool_foreach (fib_table, ip6_main.fibs)
   {
    /* don't send link locals */
    if (fib_table->ft_flags & FIB_TABLE_FLAG_IP6_LL)
      continue;
    send_ip_table_details(am, reg, mp->context, fib_table);
  }
}

typedef struct vl_api_ip_fib_dump_walk_ctx_t_
{
  fib_node_index_t *feis;
} vl_api_ip_fib_dump_walk_ctx_t;

static fib_table_walk_rc_t
vl_api_ip_fib_dump_walk (fib_node_index_t fei, void *arg)
{
  vl_api_ip_fib_dump_walk_ctx_t *ctx = arg;

  vec_add1 (ctx->feis, fei);

  return (FIB_TABLE_WALK_CONTINUE);
}

static void
send_ip_route_details (vpe_api_main_t * am,
		       vl_api_registration_t * reg,
		       u32 context, fib_node_index_t fib_entry_index)
{
  fib_route_path_t *rpaths, *rpath;
  vl_api_ip_route_details_t *mp;
  const fib_prefix_t *pfx;
  vl_api_fib_path_t *fp;
  int path_count;

  rpaths = NULL;
  pfx = fib_entry_get_prefix (fib_entry_index);
  rpaths = fib_entry_encode (fib_entry_index);

  path_count = vec_len (rpaths);
  mp = vl_msg_api_alloc (sizeof (*mp) + path_count * sizeof (*fp));
  if (!mp)
    return;
  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_IP_ROUTE_DETAILS);
  mp->context = context;

  ip_prefix_encode (pfx, &mp->route.prefix);
  mp->route.table_id =
    htonl (fib_table_get_table_id
	   (fib_entry_get_fib_index (fib_entry_index), pfx->fp_proto));
  mp->route.n_paths = path_count;
  mp->route.stats_index =
    htonl (fib_table_entry_get_stats_index
	   (fib_entry_get_fib_index (fib_entry_index), pfx));

  fp = mp->route.paths;
  vec_foreach (rpath, rpaths)
  {
    fib_api_path_encode (rpath, fp);
    fp++;
  }

  vl_api_send_msg (reg, (u8 *) mp);
  vec_free (rpaths);
}

static void
send_ip_route_v2_details (vpe_api_main_t *am, vl_api_registration_t *reg,
			  u32 context, fib_node_index_t fib_entry_index)
{
  fib_route_path_t *rpaths, *rpath;
  vl_api_ip_route_v2_details_t *mp;
  const fib_prefix_t *pfx;
  vl_api_fib_path_t *fp;
  int path_count;

  rpaths = NULL;
  pfx = fib_entry_get_prefix (fib_entry_index);
  rpaths = fib_entry_encode (fib_entry_index);

  path_count = vec_len (rpaths);
  mp = vl_msg_api_alloc (sizeof (*mp) + path_count * sizeof (*fp));
  if (!mp)
    return;
  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_IP_ROUTE_V2_DETAILS);
  mp->context = context;

  ip_prefix_encode (pfx, &mp->route.prefix);
  mp->route.table_id = htonl (fib_table_get_table_id (
    fib_entry_get_fib_index (fib_entry_index), pfx->fp_proto));
  mp->route.n_paths = path_count;
  mp->route.src = fib_entry_get_best_source (fib_entry_index);
  mp->route.stats_index = htonl (fib_table_entry_get_stats_index (
    fib_entry_get_fib_index (fib_entry_index), pfx));

  fp = mp->route.paths;
  vec_foreach (rpath, rpaths)
    {
      fib_api_path_encode (rpath, fp);
      fp++;
    }

  vl_api_send_msg (reg, (u8 *) mp);
  vec_free (rpaths);
}

typedef struct apt_ip6_fib_show_ctx_t_
{
  fib_node_index_t *entries;
} api_ip6_fib_show_ctx_t;

static void
vl_api_ip_route_dump_t_handler (vl_api_ip_route_dump_t * mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  fib_node_index_t *fib_entry_index;
  vl_api_registration_t *reg;
  fib_protocol_t fproto;
  u32 fib_index;

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  vl_api_ip_fib_dump_walk_ctx_t ctx = {
    .feis = NULL,
  };

  fproto = (mp->table.is_ip6 ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
  fib_index = fib_table_find (fproto, ntohl (mp->table.table_id));

  if (INDEX_INVALID == fib_index)
    return;

  fib_table_walk (fib_index, fproto, vl_api_ip_fib_dump_walk, &ctx);

  vec_foreach (fib_entry_index, ctx.feis)
  {
    send_ip_route_details (am, reg, mp->context, *fib_entry_index);
  }

  vec_free (ctx.feis);
}

static void
vl_api_ip_route_v2_dump_t_handler (vl_api_ip_route_v2_dump_t *mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  fib_node_index_t *fib_entry_index;
  vl_api_registration_t *reg;
  fib_protocol_t fproto;
  fib_source_t src;
  u32 fib_index;

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  vl_api_ip_fib_dump_walk_ctx_t ctx = {
    .feis = NULL,
  };

  fproto = (mp->table.is_ip6 ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
  fib_index = fib_table_find (fproto, ntohl (mp->table.table_id));
  src = mp->src;

  if (INDEX_INVALID == fib_index)
    return;

  if (src)
    fib_table_walk_w_src (fib_index, fproto, src, vl_api_ip_fib_dump_walk,
			  &ctx);
  else
    fib_table_walk (fib_index, fproto, vl_api_ip_fib_dump_walk, &ctx);

  vec_foreach (fib_entry_index, ctx.feis)
    {
      send_ip_route_v2_details (am, reg, mp->context, *fib_entry_index);
    }

  vec_free (ctx.feis);
}

static void
send_ip_mtable_details (vl_api_registration_t * reg,
			u32 context, const mfib_table_t * mfib_table)
{
  vl_api_ip_mtable_details_t *mp;

  mp = vl_msg_api_alloc (sizeof (*mp));
  if (!mp)
    return;
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_IP_MTABLE_DETAILS);
  mp->context = context;

  mp->table.table_id = htonl (mfib_table->mft_table_id);
  mp->table.is_ip6 = (FIB_PROTOCOL_IP6 == mfib_table->mft_proto);

  vl_api_send_msg (reg, (u8 *) mp);
}

static void
vl_api_ip_mtable_dump_t_handler (vl_api_ip_mtable_dump_t * mp)
{
  vl_api_registration_t *reg;
  mfib_table_t *mfib_table;

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  pool_foreach (mfib_table, ip4_main.mfibs)
   {
      send_ip_mtable_details (reg, mp->context, mfib_table);
  }
  pool_foreach (mfib_table, ip6_main.mfibs)
   {
      send_ip_mtable_details (reg, mp->context, mfib_table);
  }
}

typedef struct vl_api_ip_mfib_dump_ctx_t_
{
  fib_node_index_t *entries;
} vl_api_ip_mfib_dump_ctx_t;

static walk_rc_t
mfib_route_dump_walk (fib_node_index_t fei, void *arg)
{
  vl_api_ip_mfib_dump_ctx_t *ctx = arg;

  vec_add1 (ctx->entries, fei);

  return (WALK_CONTINUE);
}

static void
send_ip_mroute_details (vpe_api_main_t * am,
			vl_api_registration_t * reg,
			u32 context, fib_node_index_t mfib_entry_index)
{
  fib_route_path_t *rpaths, *rpath;
  vl_api_ip_mroute_details_t *mp;
  const mfib_prefix_t *pfx;
  vl_api_mfib_path_t *fp;
  u8 path_count;

  rpaths = NULL;
  pfx = mfib_entry_get_prefix (mfib_entry_index);
  rpaths = mfib_entry_encode (mfib_entry_index);

  path_count = vec_len (rpaths);
  mp = vl_msg_api_alloc (sizeof (*mp) + path_count * sizeof (*fp));
  if (!mp)
    return;
  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_IP_MROUTE_DETAILS);
  mp->context = context;

  ip_mprefix_encode (pfx, &mp->route.prefix);
  mp->route.table_id =
    htonl (mfib_table_get_table_id
	   (mfib_entry_get_fib_index (mfib_entry_index), pfx->fp_proto));
  mp->route.n_paths = path_count;
  fp = mp->route.paths;
  vec_foreach (rpath, rpaths)
  {
    mfib_api_path_encode (rpath, fp);
    fp++;
  }

  vl_api_send_msg (reg, (u8 *) mp);
  vec_free (rpaths);
}

static void
vl_api_ip_mroute_dump_t_handler (vl_api_ip_mroute_dump_t * mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  vl_api_registration_t *reg;
  fib_node_index_t *mfeip;
  fib_protocol_t fproto;
  u32 fib_index;

  vl_api_ip_mfib_dump_ctx_t ctx = {
    .entries = NULL,
  };

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  fproto = fib_ip_proto (mp->table.is_ip6);
  fib_index = mfib_table_find (fproto, ntohl (mp->table.table_id));

  if (INDEX_INVALID == fib_index)
    return;

  mfib_table_walk (fib_index, fproto, mfib_route_dump_walk, &ctx);

  vec_sort_with_function (ctx.entries, mfib_entry_cmp_for_sort);

  vec_foreach (mfeip, ctx.entries)
  {
    send_ip_mroute_details (am, reg, mp->context, *mfeip);
  }

  vec_free (ctx.entries);
}

static void
vl_api_ip_punt_police_t_handler (vl_api_ip_punt_police_t * mp,
				 vlib_main_t * vm)
{
  vl_api_ip_punt_police_reply_t *rmp;
  int rv = 0;

  if (mp->is_ip6)
    ip6_punt_policer_add_del (mp->is_add, ntohl (mp->policer_index));
  else
    ip4_punt_policer_add_del (mp->is_add, ntohl (mp->policer_index));

  REPLY_MACRO (VL_API_IP_PUNT_POLICE_REPLY);
}

static void
ip_punt_redirect_t_handler_common (u8 is_add, u32 rx_sw_if_index,
				   ip_address_family_t af,
				   const fib_route_path_t *rpaths)
{
  if (is_add)
    {
      if (af == AF_IP6)
	ip6_punt_redirect_add_paths (rx_sw_if_index, rpaths);
      else if (af == AF_IP4)
	ip4_punt_redirect_add_paths (rx_sw_if_index, rpaths);
    }
  else
    {
      if (af == AF_IP6)
	ip6_punt_redirect_del (rx_sw_if_index);
      else if (af == AF_IP4)
	ip4_punt_redirect_del (rx_sw_if_index);
    }
}

static void
vl_api_ip_punt_redirect_t_handler (vl_api_ip_punt_redirect_t *mp,
				   vlib_main_t *vm)
{
  vl_api_ip_punt_redirect_reply_t *rmp;
  fib_route_path_t *rpaths = NULL, rpath = {
    .frp_weight = 1,
    .frp_fib_index = ~0,
  };
  ip_address_family_t af;
  ip46_type_t ipv;
  u32 rx_sw_if_index;
  int rv = 0;

  if (!vnet_sw_if_index_is_api_valid (ntohl (mp->punt.tx_sw_if_index)))
    goto bad_sw_if_index;

  ipv = ip_address_decode (&mp->punt.nh, &rpath.frp_addr);
  af = (ipv == IP46_TYPE_IP6) ? AF_IP6 : AF_IP4;
  rpath.frp_proto = (ipv == IP46_TYPE_IP6) ? DPO_PROTO_IP6 : DPO_PROTO_IP4;
  rpath.frp_sw_if_index = ntohl (mp->punt.tx_sw_if_index);
  rx_sw_if_index = ntohl (mp->punt.rx_sw_if_index);

  vec_add1 (rpaths, rpath);
  ip_punt_redirect_t_handler_common (mp->is_add, rx_sw_if_index, af, rpaths);
  vec_free (rpaths);

  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO (VL_API_IP_PUNT_REDIRECT_REPLY);
}

static void
vl_api_add_del_ip_punt_redirect_v2_t_handler (
  vl_api_add_del_ip_punt_redirect_v2_t *mp, vlib_main_t *vm)
{
  vl_api_add_del_ip_punt_redirect_v2_reply_t *rmp;
  fib_route_path_t *rpaths = NULL, *rpath;
  vl_api_fib_path_t *apath;
  ip_address_family_t af;
  u32 rx_sw_if_index, n_paths;
  int rv = 0, ii;

  rx_sw_if_index = ntohl (mp->punt.rx_sw_if_index);
  n_paths = ntohl (mp->punt.n_paths);

  rv = ip_address_family_decode (mp->punt.af, &af);
  if (rv != 0)
    goto out;

  if (0 != n_paths)
    {
      vec_validate (rpaths, n_paths - 1);
    }

  for (ii = 0; ii < n_paths; ii++)
    {
      apath = &mp->punt.paths[ii];
      rpath = &rpaths[ii];

      rv = fib_api_path_decode (apath, rpath);

      if (rv != 0)
	goto out;
    }

  ip_punt_redirect_t_handler_common (mp->is_add, rx_sw_if_index, af, rpaths);

out:
  vec_free (rpaths);

  REPLY_MACRO (VL_API_ADD_DEL_IP_PUNT_REDIRECT_V2_REPLY);
}

static clib_error_t *
call_elf_section_ip_table_callbacks (vnet_main_t * vnm, u32 table_id,
				     u32 flags,
				     _vnet_ip_table_function_list_elt_t **
				     elts)
{
  _vnet_ip_table_function_list_elt_t *elt;
  vnet_ip_table_function_priority_t prio;
  clib_error_t *error = 0;

  for (prio = VNET_IP_TABLE_FUNC_PRIORITY_LOW;
       prio <= VNET_IP_TABLE_FUNC_PRIORITY_HIGH; prio++)
    {
      elt = elts[prio];

      while (elt)
	{
	  error = elt->fp (vnm, table_id, flags);
	  if (error)
	    return error;
	  elt = elt->next_ip_table_function;
	}
    }
  return error;
}

void
ip_table_delete (fib_protocol_t fproto, u32 table_id, u8 is_api)
{
  u32 fib_index, mfib_index;
  vnet_main_t *vnm = vnet_get_main ();

  /*
   * ignore action on the default table - this is always present
   * and cannot be added nor deleted from the API
   */
  if (0 != table_id)
    {
      /*
       * The API holds only one lock on the table.
       * i.e. it can be added many times via the API but needs to be
       * deleted only once.
       * The FIB index for unicast and multicast is not necessarily the
       * same, since internal VPP systesm (like LISP and SR) create
       * their own unicast tables.
       */
      fib_index = fib_table_find (fproto, table_id);
      mfib_index = mfib_table_find (fproto, table_id);

      if ((~0 != fib_index) || (~0 != mfib_index))
	call_elf_section_ip_table_callbacks (vnm, table_id, 0 /* is_add */ ,
					     vnm->ip_table_add_del_functions);

      if (~0 != fib_index)
	{
	  fib_table_unlock (fib_index, fproto,
			    (is_api ? FIB_SOURCE_API : FIB_SOURCE_CLI));
	}
      if (~0 != mfib_index)
	{
	  mfib_table_unlock (mfib_index, fproto,
			     (is_api ? MFIB_SOURCE_API : MFIB_SOURCE_CLI));
	}
    }
}

/*
 * Returns an unused table id, and ~0 if it can't find one.
 */
u32
ip_table_get_unused_id (fib_protocol_t fproto)
{
  int i, j;
  static u32 seed = 0;
  /* limit to 1M tries */
  for (j = 0; j < 1 << 10; j++)
    {
      seed = random_u32 (&seed);
      for (i = 0; i < 1 << 10; i++)
	{
	  /* look around randomly generated id */
	  seed += (2 * (i % 2) - 1) * i;
	  if (seed == ~0)
	    continue;
	  if (fib_table_find (fproto, seed) == ~0)
	    return seed;
	}
    }

  return ~0;
}

void
vl_api_ip_table_add_del_t_handler (vl_api_ip_table_add_del_t * mp)
{
  vl_api_ip_table_add_del_reply_t *rmp;
  fib_protocol_t fproto = (mp->table.is_ip6 ?
			   FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
  u32 table_id = ntohl (mp->table.table_id);
  int rv = 0;

  if (mp->is_add)
    {
      ip_table_create (fproto, table_id, 1, mp->table.name);
    }
  else
    {
      ip_table_delete (fproto, table_id, 1);
    }

  REPLY_MACRO (VL_API_IP_TABLE_ADD_DEL_REPLY);
}

void
vl_api_ip_table_allocate_t_handler (vl_api_ip_table_allocate_t *mp)
{
  vl_api_ip_table_allocate_reply_t *rmp;
  fib_protocol_t fproto =
    (mp->table.is_ip6 ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
  u32 table_id = ntohl (mp->table.table_id);
  int rv = 0;

  if (~0 == table_id)
    table_id = ip_table_get_unused_id (fproto);

  if (~0 == table_id)
    rv = VNET_API_ERROR_EAGAIN;
  else
    ip_table_create (fproto, table_id, 1, mp->table.name);

  REPLY_MACRO2 (VL_API_IP_TABLE_ALLOCATE_REPLY, {
    clib_memcpy_fast (&rmp->table, &mp->table, sizeof (mp->table));
    rmp->table.table_id = htonl (table_id);
  })
}

static int
ip_route_add_del_t_handler (vl_api_ip_route_add_del_t * mp, u32 * stats_index)
{
  fib_route_path_t *rpaths = NULL, *rpath;
  fib_entry_flag_t entry_flags;
  vl_api_fib_path_t *apath;
  fib_prefix_t pfx;
  u32 fib_index;
  int rv, ii;

  entry_flags = FIB_ENTRY_FLAG_NONE;
  ip_prefix_decode (&mp->route.prefix, &pfx);

  rv = fib_api_table_id_decode (pfx.fp_proto,
				ntohl (mp->route.table_id), &fib_index);
  if (0 != rv)
    goto out;

  if (0 != mp->route.n_paths)
    vec_validate (rpaths, mp->route.n_paths - 1);

  for (ii = 0; ii < mp->route.n_paths; ii++)
    {
      apath = &mp->route.paths[ii];
      rpath = &rpaths[ii];

      rv = fib_api_path_decode (apath, rpath);

      if ((rpath->frp_flags & FIB_ROUTE_PATH_LOCAL) &&
	  (~0 == rpath->frp_sw_if_index))
	entry_flags |= (FIB_ENTRY_FLAG_CONNECTED | FIB_ENTRY_FLAG_LOCAL);

      if (0 != rv)
	goto out;
    }

  rv = fib_api_route_add_del (mp->is_add, mp->is_multipath, fib_index, &pfx,
			      FIB_SOURCE_API, entry_flags, rpaths);

  if (mp->is_add && 0 == rv)
    *stats_index = fib_table_entry_get_stats_index (fib_index, &pfx);

out:
  vec_free (rpaths);

  return (rv);
}

static int
ip_route_add_del_v2_t_handler (vl_api_ip_route_add_del_v2_t *mp,
			       u32 *stats_index)
{
  fib_route_path_t *rpaths = NULL, *rpath;
  fib_entry_flag_t entry_flags;
  vl_api_fib_path_t *apath;
  fib_source_t src;
  fib_prefix_t pfx;
  u32 fib_index;
  int rv, ii;

  entry_flags = FIB_ENTRY_FLAG_NONE;
  ip_prefix_decode (&mp->route.prefix, &pfx);

  rv = fib_api_table_id_decode (pfx.fp_proto, ntohl (mp->route.table_id),
				&fib_index);
  if (0 != rv)
    goto out;

  if (0 != mp->route.n_paths)
    vec_validate (rpaths, mp->route.n_paths - 1);

  for (ii = 0; ii < mp->route.n_paths; ii++)
    {
      apath = &mp->route.paths[ii];
      rpath = &rpaths[ii];

      rv = fib_api_path_decode (apath, rpath);

      if ((rpath->frp_flags & FIB_ROUTE_PATH_LOCAL) &&
	  (~0 == rpath->frp_sw_if_index))
	entry_flags |= (FIB_ENTRY_FLAG_CONNECTED | FIB_ENTRY_FLAG_LOCAL);

      if (0 != rv)
	goto out;
    }

  src = (0 == mp->route.src ? FIB_SOURCE_API : mp->route.src);

  rv = fib_api_route_add_del (mp->is_add, mp->is_multipath, fib_index, &pfx,
			      src, entry_flags, rpaths);

  if (mp->is_add && 0 == rv)
    *stats_index = fib_table_entry_get_stats_index (fib_index, &pfx);

out:
  vec_free (rpaths);

  return (rv);
}

void
vl_api_ip_route_add_del_t_handler (vl_api_ip_route_add_del_t * mp)
{
  vl_api_ip_route_add_del_reply_t *rmp;
  u32 stats_index = ~0;
  int rv;

  rv = ip_route_add_del_t_handler (mp, &stats_index);

  REPLY_MACRO2 (VL_API_IP_ROUTE_ADD_DEL_REPLY,
  ({
    rmp->stats_index = htonl (stats_index);
  }))
}

void
vl_api_ip_route_add_del_v2_t_handler (vl_api_ip_route_add_del_v2_t *mp)
{
  vl_api_ip_route_add_del_v2_reply_t *rmp;
  u32 stats_index = ~0;
  int rv;

  rv = ip_route_add_del_v2_t_handler (mp, &stats_index);

  /* clang-format off */
  REPLY_MACRO2 (VL_API_IP_ROUTE_ADD_DEL_V2_REPLY,
  ({
    rmp->stats_index = htonl (stats_index);
  }))
  /* clang-format on */
}

void
vl_api_ip_route_lookup_t_handler (vl_api_ip_route_lookup_t * mp)
{
  vl_api_ip_route_lookup_reply_t *rmp = NULL;
  fib_route_path_t *rpaths = NULL, *rpath;
  const fib_prefix_t *pfx = NULL;
  fib_prefix_t lookup;
  vl_api_fib_path_t *fp;
  fib_node_index_t fib_entry_index;
  u32 fib_index;
  int npaths = 0;
  int rv;

  ip_prefix_decode (&mp->prefix, &lookup);
  rv = fib_api_table_id_decode (lookup.fp_proto, ntohl (mp->table_id),
				&fib_index);
  if (PREDICT_TRUE (!rv))
    {
      if (mp->exact)
	fib_entry_index = fib_table_lookup_exact_match (fib_index, &lookup);
      else
	fib_entry_index = fib_table_lookup (fib_index, &lookup);
      if (fib_entry_index == FIB_NODE_INDEX_INVALID)
	rv = VNET_API_ERROR_NO_SUCH_ENTRY;
      else
	{
	  pfx = fib_entry_get_prefix (fib_entry_index);
	  rpaths = fib_entry_encode (fib_entry_index);
	  npaths = vec_len (rpaths);
	}
    }

  REPLY_MACRO3_ZERO(VL_API_IP_ROUTE_LOOKUP_REPLY,
                    npaths * sizeof (*fp),
  ({
    if (!rv)
      {
        ip_prefix_encode (pfx, &rmp->route.prefix);
        rmp->route.table_id = mp->table_id;
        rmp->route.n_paths = npaths;
        rmp->route.stats_index = fib_table_entry_get_stats_index (fib_index, pfx);
        rmp->route.stats_index = htonl (rmp->route.stats_index);

        fp = rmp->route.paths;
        vec_foreach (rpath, rpaths)
          {
            fib_api_path_encode (rpath, fp);
            fp++;
          }
      }
  }));
  vec_free (rpaths);
}

void
vl_api_ip_route_lookup_v2_t_handler (vl_api_ip_route_lookup_v2_t *mp)
{
  vl_api_ip_route_lookup_v2_reply_t *rmp = NULL;
  fib_route_path_t *rpaths = NULL, *rpath;
  const fib_prefix_t *pfx = NULL;
  fib_prefix_t lookup;
  vl_api_fib_path_t *fp;
  fib_node_index_t fib_entry_index;
  u32 fib_index;
  int npaths = 0;
  fib_source_t src = 0;
  int rv;

  ip_prefix_decode (&mp->prefix, &lookup);
  rv = fib_api_table_id_decode (lookup.fp_proto, ntohl (mp->table_id),
				&fib_index);
  if (PREDICT_TRUE (!rv))
    {
      if (mp->exact)
	fib_entry_index = fib_table_lookup_exact_match (fib_index, &lookup);
      else
	fib_entry_index = fib_table_lookup (fib_index, &lookup);
      if (fib_entry_index == FIB_NODE_INDEX_INVALID)
	rv = VNET_API_ERROR_NO_SUCH_ENTRY;
      else
	{
	  pfx = fib_entry_get_prefix (fib_entry_index);
	  rpaths = fib_entry_encode (fib_entry_index);
	  npaths = vec_len (rpaths);
	  src = fib_entry_get_best_source (fib_entry_index);
	}
    }

  /* clang-format off */
  REPLY_MACRO3_ZERO(VL_API_IP_ROUTE_LOOKUP_V2_REPLY,
                    npaths * sizeof (*fp),
  ({
    if (!rv)
      {
        ip_prefix_encode (pfx, &rmp->route.prefix);
        rmp->route.table_id = mp->table_id;
        rmp->route.n_paths = npaths;
        rmp->route.src = src;
        rmp->route.stats_index = fib_table_entry_get_stats_index (fib_index, pfx);
        rmp->route.stats_index = htonl (rmp->route.stats_index);

        fp = rmp->route.paths;
        vec_foreach (rpath, rpaths)
          {
            fib_api_path_encode (rpath, fp);
            fp++;
          }
      }
  }));
  /* clang-format on */
  vec_free (rpaths);
}

void
ip_table_create (fib_protocol_t fproto,
		 u32 table_id, u8 is_api, const u8 * name)
{
  u32 fib_index, mfib_index;
  vnet_main_t *vnm = vnet_get_main ();

  /*
   * ignore action on the default table - this is always present
   * and cannot be added nor deleted from the API
   */
  if (0 != table_id)
    {
      /*
       * The API holds only one lock on the table.
       * i.e. it can be added many times via the API but needs to be
       * deleted only once.
       * The FIB index for unicast and multicast is not necessarily the
       * same, since internal VPP systesm (like LISP and SR) create
       * their own unicast tables.
       */
      fib_index = fib_table_find (fproto, table_id);
      mfib_index = mfib_table_find (fproto, table_id);

      /*
       * Always try to re-lock in case the fib was deleted by an API call
       * but was not yet freed because some other locks were held
       */
      fib_table_find_or_create_and_lock_w_name (
	fproto, table_id, (is_api ? FIB_SOURCE_API : FIB_SOURCE_CLI), name);
      mfib_table_find_or_create_and_lock_w_name (
	fproto, table_id, (is_api ? MFIB_SOURCE_API : MFIB_SOURCE_CLI), name);

      if ((~0 == fib_index) || (~0 == mfib_index))
	call_elf_section_ip_table_callbacks (vnm, table_id, 1 /* is_add */ ,
					     vnm->ip_table_add_del_functions);
    }
}

static u32
mroute_add_del_handler (u8 is_add,
			u8 is_multipath,
			u32 fib_index,
			const mfib_prefix_t * prefix,
			u32 entry_flags,
			u32 rpf_id, fib_route_path_t * rpaths)
{
  u32 mfib_entry_index = ~0;

  if (0 == vec_len (rpaths))
    {
      mfib_entry_index = mfib_table_entry_update (fib_index, prefix,
						  MFIB_SOURCE_API,
						  rpf_id, entry_flags);
    }
  else
    {
      if (is_add)
	{
	  mfib_entry_index = mfib_table_entry_paths_update (
	    fib_index, prefix, MFIB_SOURCE_API, entry_flags, rpaths);
	}
      else
	{
	  mfib_table_entry_paths_remove (fib_index, prefix,
					 MFIB_SOURCE_API, rpaths);
	}
    }

  return (mfib_entry_index);
}

static int
api_mroute_add_del_t_handler (vl_api_ip_mroute_add_del_t * mp,
			      u32 * stats_index)
{
  fib_route_path_t *rpath, *rpaths = NULL;
  fib_node_index_t mfib_entry_index;
  mfib_entry_flags_t eflags;
  mfib_prefix_t pfx;
  u32 fib_index;
  int rv;
  u16 ii;

  ip_mprefix_decode (&mp->route.prefix, &pfx);

  rv = mfib_api_table_id_decode (pfx.fp_proto,
				 ntohl (mp->route.table_id), &fib_index);
  if (0 != rv)
    goto out;

  vec_validate (rpaths, mp->route.n_paths - 1);

  for (ii = 0; ii < mp->route.n_paths; ii++)
    {
      rpath = &rpaths[ii];

      rv = mfib_api_path_decode (&mp->route.paths[ii], rpath);

      if (0 != rv)
	goto out;
    }

  eflags = mfib_api_path_entry_flags_decode (mp->route.entry_flags);
  mfib_entry_index = mroute_add_del_handler (mp->is_add,
					     mp->is_add,
					     fib_index, &pfx,
					     eflags,
					     ntohl (mp->route.rpf_id),
					     rpaths);

  if (~0 != mfib_entry_index)
    *stats_index = mfib_entry_get_stats_index (mfib_entry_index);

out:
  return (rv);
}

void
vl_api_ip_mroute_add_del_t_handler (vl_api_ip_mroute_add_del_t * mp)
{
  vl_api_ip_mroute_add_del_reply_t *rmp;
  u32 stats_index = ~0;
  int rv;

  rv = api_mroute_add_del_t_handler (mp, &stats_index);

  REPLY_MACRO2 (VL_API_IP_MROUTE_ADD_DEL_REPLY,
  ({
    rmp->stats_index = htonl (stats_index);
  }));
}

static void
send_ip_details (vpe_api_main_t * am,
		 vl_api_registration_t * reg, u32 sw_if_index, u8 is_ipv6,
		 u32 context)
{
  vl_api_ip_details_t *mp;

  mp = vl_msg_api_alloc (sizeof (*mp));
  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_IP_DETAILS);

  mp->sw_if_index = ntohl (sw_if_index);
  mp->is_ipv6 = is_ipv6;
  mp->context = context;

  vl_api_send_msg (reg, (u8 *) mp);
}

static void
send_ip_address_details (vpe_api_main_t * am,
			 vl_api_registration_t * reg,
			 const fib_prefix_t * pfx,
			 u32 sw_if_index, u32 context)
{
  vl_api_ip_address_details_t *mp;

  mp = vl_msg_api_alloc (sizeof (*mp));
  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_IP_ADDRESS_DETAILS);

  ip_prefix_encode (pfx, &mp->prefix);
  mp->context = context;
  mp->sw_if_index = htonl (sw_if_index);

  vl_api_send_msg (reg, (u8 *) mp);
}

static void
vl_api_ip_address_dump_t_handler (vl_api_ip_address_dump_t * mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  vl_api_registration_t *reg;
  ip6_main_t *im6 = &ip6_main;
  ip4_main_t *im4 = &ip4_main;
  ip_lookup_main_t *lm6 = &im6->lookup_main;
  ip_lookup_main_t *lm4 = &im4->lookup_main;
  ip_interface_address_t *ia = 0;
  u32 sw_if_index = ~0;
  int rv __attribute__ ((unused)) = 0;

  VALIDATE_SW_IF_INDEX (mp);

  sw_if_index = ntohl (mp->sw_if_index);

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  if (mp->is_ipv6)
    {
      /* Do not send subnet details of the IP-interface for
       * unnumbered interfaces. otherwise listening clients
       * will be confused that the subnet is applied on more
       * than one interface */
      foreach_ip_interface_address (lm6, ia, sw_if_index, 0,
      ({
        fib_prefix_t pfx = {
          .fp_addr.ip6 = *(ip6_address_t *)ip_interface_address_get_address (lm6, ia),
          .fp_len = ia->address_length,
          .fp_proto = FIB_PROTOCOL_IP6,
        };
        send_ip_address_details(am, reg, &pfx, sw_if_index, mp->context);
      }));
    }
  else
    {
      foreach_ip_interface_address (lm4, ia, sw_if_index, 0,
      ({
        fib_prefix_t pfx = {
          .fp_addr.ip4 = *(ip4_address_t *)ip_interface_address_get_address (lm4, ia),
          .fp_len = ia->address_length,
          .fp_proto = FIB_PROTOCOL_IP4,
        };

        send_ip_address_details(am, reg, &pfx, sw_if_index, mp->context);
      }));
    }

  BAD_SW_IF_INDEX_LABEL;
}

static void
send_ip_unnumbered_details (vpe_api_main_t * am,
			    vl_api_registration_t * reg,
			    u32 sw_if_index, u32 ip_sw_if_index, u32 context)
{
  vl_api_ip_unnumbered_details_t *mp;

  mp = vl_msg_api_alloc (sizeof (*mp));
  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_IP_UNNUMBERED_DETAILS);

  mp->context = context;
  mp->sw_if_index = htonl (sw_if_index);
  mp->ip_sw_if_index = htonl (ip_sw_if_index);

  vl_api_send_msg (reg, (u8 *) mp);
}

static void
vl_api_ip_unnumbered_dump_t_handler (vl_api_ip_unnumbered_dump_t * mp)
{
  vnet_main_t *vnm = vnet_get_main ();
  vnet_interface_main_t *im = &vnm->interface_main;
  int rv __attribute__ ((unused)) = 0;
  vpe_api_main_t *am = &vpe_api_main;
  vl_api_registration_t *reg;
  vnet_sw_interface_t *si;
  u32 sw_if_index;

  sw_if_index = ntohl (mp->sw_if_index);

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  if (~0 != sw_if_index)
    {
      VALIDATE_SW_IF_INDEX (mp);

      si = vnet_get_sw_interface (vnm, ntohl (mp->sw_if_index));

      if (si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
	{
	  send_ip_unnumbered_details (am, reg,
				      sw_if_index,
				      si->unnumbered_sw_if_index,
				      mp->context);
	}
    }
  else
    {
      pool_foreach (si, im->sw_interfaces)
       {
        if ((si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED))
          {
            send_ip_unnumbered_details(am, reg,
                                       si->sw_if_index,
                                       si->unnumbered_sw_if_index,
                                       mp->context);
          }
      }
    }

  BAD_SW_IF_INDEX_LABEL;
}

static void
vl_api_ip_dump_t_handler (vl_api_ip_dump_t * mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  vnet_main_t *vnm = vnet_get_main ();
  //vlib_main_t *vm = vlib_get_main ();
  vnet_interface_main_t *im = &vnm->interface_main;
  vl_api_registration_t *reg;
  vnet_sw_interface_t *si, *sorted_sis;
  u32 sw_if_index = ~0;

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  /* Gather interfaces. */
  sorted_sis = vec_new (vnet_sw_interface_t, pool_elts (im->sw_interfaces));
  vec_set_len (sorted_sis, 0);
  pool_foreach (si, im->sw_interfaces)
   {
    vec_add1 (sorted_sis, si[0]);
  }

  vec_foreach (si, sorted_sis)
  {
    if (!(si->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED))
      {
	/* if (mp->is_ipv6 && !ip6_interface_enabled (vm, si->sw_if_index)) */
	/*   { */
	/*     continue; */
	/*   } */
	sw_if_index = si->sw_if_index;
	send_ip_details (am, reg, sw_if_index, mp->is_ipv6, mp->context);
      }
  }

  vec_free (sorted_sis);
}

static void
vl_api_set_ip_flow_hash_t_handler (vl_api_set_ip_flow_hash_t *mp)
{
  vl_api_set_ip_flow_hash_reply_t *rmp;
  int rv;
  u32 table_id;
  flow_hash_config_t flow_hash_config = 0;

  table_id = ntohl (mp->vrf_id);

#define _(a,b) if (mp->a) flow_hash_config |= b;
  foreach_flow_hash_bit_v1;
#undef _

  rv = ip_flow_hash_set ((mp->is_ipv6 ? AF_IP6 : AF_IP4), table_id,
			 flow_hash_config);

  REPLY_MACRO (VL_API_SET_IP_FLOW_HASH_REPLY);
}

static void
vl_api_set_ip_flow_hash_v2_t_handler (vl_api_set_ip_flow_hash_v2_t *mp)
{
  vl_api_set_ip_flow_hash_v2_reply_t *rmp;
  ip_address_family_t af;
  int rv;

  rv = ip_address_family_decode (mp->af, &af);

  if (!rv)
    rv = ip_flow_hash_set (af, htonl (mp->table_id),
			   htonl (mp->flow_hash_config));

  REPLY_MACRO (VL_API_SET_IP_FLOW_HASH_V2_REPLY);
}

static void
vl_api_set_ip_flow_hash_v3_t_handler (vl_api_set_ip_flow_hash_v3_t *mp)
{
  vl_api_set_ip_flow_hash_v3_reply_t *rmp;
  ip_address_family_t af;
  int rv;

  rv = ip_address_family_decode (mp->af, &af);

  if (!rv)
    rv = ip_flow_hash_set (af, htonl (mp->table_id),
			   htonl (mp->flow_hash_config));

  REPLY_MACRO (VL_API_SET_IP_FLOW_HASH_V3_REPLY);
}

static void
vl_api_set_ip_flow_hash_router_id_t_handler (
  vl_api_set_ip_flow_hash_router_id_t *mp)
{
  vl_api_set_ip_flow_hash_router_id_reply_t *rmp;
  int rv = 0;

  ip_flow_hash_router_id_set (ntohl (mp->router_id));

  REPLY_MACRO (VL_API_SET_IP_FLOW_HASH_ROUTER_ID_REPLY);
}

void
vl_mfib_signal_send_one (vl_api_registration_t * reg,
			 u32 context, const mfib_signal_t * mfs)
{
  vl_api_mfib_signal_details_t *mp;
  const mfib_prefix_t *prefix;
  mfib_table_t *mfib;
  mfib_itf_t *mfi;

  mp = vl_msg_api_alloc (sizeof (*mp));

  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_MFIB_SIGNAL_DETAILS);
  mp->context = context;

  mfi = mfib_itf_get (mfs->mfs_itf);
  prefix = mfib_entry_get_prefix (mfs->mfs_entry);
  mfib = mfib_table_get (mfib_entry_get_fib_index (mfs->mfs_entry),
			 prefix->fp_proto);
  mp->table_id = ntohl (mfib->mft_table_id);
  mp->sw_if_index = ntohl (mfi->mfi_sw_if_index);

  ip_mprefix_encode (prefix, &mp->prefix);

  if (0 != mfs->mfs_buffer_len)
    {
      mp->ip_packet_len = ntohs (mfs->mfs_buffer_len);

      memcpy (mp->ip_packet_data, mfs->mfs_buffer, mfs->mfs_buffer_len);
    }
  else
    {
      mp->ip_packet_len = 0;
    }

  vl_api_send_msg (reg, (u8 *) mp);
}

static void
vl_api_mfib_signal_dump_t_handler (vl_api_mfib_signal_dump_t * mp)
{
  vl_api_registration_t *reg;

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  while (vl_api_can_send_msg (reg) && mfib_signal_send_one (reg, mp->context))
    ;
}

static void
  vl_api_ip_container_proxy_add_del_t_handler
  (vl_api_ip_container_proxy_add_del_t * mp)
{
  vl_api_ip_container_proxy_add_del_reply_t *rmp;
  vnet_ip_container_proxy_args_t args;
  int rv = 0;
  clib_error_t *error;

  clib_memset (&args, 0, sizeof (args));

  ip_prefix_decode (&mp->pfx, &args.prefix);

  args.sw_if_index = clib_net_to_host_u32 (mp->sw_if_index);
  args.is_add = mp->is_add;
  if ((error = vnet_ip_container_proxy_add_del (&args)))
    {
      rv = clib_error_get_code (error);
      clib_error_report (error);
    }

  REPLY_MACRO (VL_API_IP_CONTAINER_PROXY_ADD_DEL_REPLY);
}

typedef struct ip_walk_ctx_t_
{
  vl_api_registration_t *reg;
  u32 context;
} ip_walk_ctx_t;

static int
ip_container_proxy_send_details (const fib_prefix_t * pfx, u32 sw_if_index,
				 void *args)
{
  vl_api_ip_container_proxy_details_t *mp;
  ip_walk_ctx_t *ctx = args;

  mp = vl_msg_api_alloc (sizeof (*mp));
  if (!mp)
    return 1;

  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id =
    ntohs (REPLY_MSG_ID_BASE + VL_API_IP_CONTAINER_PROXY_DETAILS);
  mp->context = ctx->context;

  mp->sw_if_index = ntohl (sw_if_index);
  ip_prefix_encode (pfx, &mp->prefix);

  vl_api_send_msg (ctx->reg, (u8 *) mp);

  return 1;
}

static void
vl_api_ip_container_proxy_dump_t_handler (vl_api_ip_container_proxy_dump_t *
					  mp)
{
  vl_api_registration_t *reg;

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  ip_walk_ctx_t ctx = {
    .context = mp->context,
    .reg = reg,
  };

  ip_container_proxy_walk (ip_container_proxy_send_details, &ctx);
}

static void
vl_api_ioam_enable_t_handler (vl_api_ioam_enable_t * mp)
{
  int rv = 0;
  vl_api_ioam_enable_reply_t *rmp;
  clib_error_t *error;

  /* Ignoring the profile id as currently a single profile
   * is supported */
  error = ip6_ioam_enable (mp->trace_enable, mp->pot_enable,
			   mp->seqno, mp->analyse);
  if (error)
    {
      clib_error_report (error);
      rv = clib_error_get_code (error);
    }

  REPLY_MACRO (VL_API_IOAM_ENABLE_REPLY);
}

static void
vl_api_ioam_disable_t_handler (vl_api_ioam_disable_t * mp)
{
  int rv = 0;
  vl_api_ioam_disable_reply_t *rmp;
  clib_error_t *error;

  error = clear_ioam_rewrite_fn ();
  if (error)
    {
      clib_error_report (error);
      rv = clib_error_get_code (error);
    }

  REPLY_MACRO (VL_API_IOAM_DISABLE_REPLY);
}

static void
  vl_api_ip_source_and_port_range_check_add_del_t_handler
  (vl_api_ip_source_and_port_range_check_add_del_t * mp)
{
  vl_api_ip_source_and_port_range_check_add_del_reply_t *rmp;
  int rv = 0;

  u8 is_add = mp->is_add;
  fib_prefix_t pfx;
  u16 *low_ports = 0;
  u16 *high_ports = 0;
  u32 vrf_id;
  u16 tmp_low, tmp_high;
  u8 num_ranges;
  int i;

  ip_prefix_decode (&mp->prefix, &pfx);

  // Validate port range
  num_ranges = mp->number_of_ranges;
  if (num_ranges > 32)
    {				// This is size of array in VPE.API
      rv = VNET_API_ERROR_EXCEEDED_NUMBER_OF_RANGES_CAPACITY;
      goto reply;
    }

  vec_reset_length (low_ports);
  vec_reset_length (high_ports);

  for (i = 0; i < num_ranges; i++)
    {
      tmp_low = mp->low_ports[i];
      tmp_high = mp->high_ports[i];
      // If tmp_low <= tmp_high then only need to check tmp_low = 0
      // If tmp_low <= tmp_high then only need to check tmp_high > 65535
      if (tmp_low > tmp_high || tmp_low == 0 || tmp_high > 65535)
	{
	  rv = VNET_API_ERROR_INVALID_VALUE;
	  goto reply;
	}
      vec_add1 (low_ports, tmp_low);
      vec_add1 (high_ports, tmp_high + 1);
    }

  vrf_id = ntohl (mp->vrf_id);

  if (vrf_id < 1)
    {
      rv = VNET_API_ERROR_INVALID_VALUE;
      goto reply;
    }


  if (FIB_PROTOCOL_IP6 == pfx.fp_proto)
    {
      rv = ip6_source_and_port_range_check_add_del (&pfx.fp_addr.ip6,
						    pfx.fp_len,
						    vrf_id,
						    low_ports,
						    high_ports, is_add);
    }
  else
    {
      rv = ip4_source_and_port_range_check_add_del (&pfx.fp_addr.ip4,
						    pfx.fp_len,
						    vrf_id,
						    low_ports,
						    high_ports, is_add);
    }

reply:
  vec_free (low_ports);
  vec_free (high_ports);
  REPLY_MACRO (VL_API_IP_SOURCE_AND_PORT_RANGE_CHECK_ADD_DEL_REPLY);
}

static void
  vl_api_ip_source_and_port_range_check_interface_add_del_t_handler
  (vl_api_ip_source_and_port_range_check_interface_add_del_t * mp)
{
  vlib_main_t *vm = vlib_get_main ();
  vl_api_ip_source_and_port_range_check_interface_add_del_reply_t *rmp;
  ip4_main_t *im = &ip4_main;
  int rv;
  u32 sw_if_index;
  u32 fib_index[IP_SOURCE_AND_PORT_RANGE_CHECK_N_PROTOCOLS];
  u32 vrf_id[IP_SOURCE_AND_PORT_RANGE_CHECK_N_PROTOCOLS];
  uword *p = 0;
  int i;

  vrf_id[IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_TCP_OUT] =
    ntohl (mp->tcp_out_vrf_id);
  vrf_id[IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_UDP_OUT] =
    ntohl (mp->udp_out_vrf_id);
  vrf_id[IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_TCP_IN] =
    ntohl (mp->tcp_in_vrf_id);
  vrf_id[IP_SOURCE_AND_PORT_RANGE_CHECK_PROTOCOL_UDP_IN] =
    ntohl (mp->udp_in_vrf_id);


  for (i = 0; i < IP_SOURCE_AND_PORT_RANGE_CHECK_N_PROTOCOLS; i++)
    {
      if (vrf_id[i] != 0 && vrf_id[i] != ~0)
	{
	  p = hash_get (im->fib_index_by_table_id, vrf_id[i]);

	  if (p == 0)
	    {
	      rv = VNET_API_ERROR_INVALID_VALUE;
	      goto reply;
	    }

	  fib_index[i] = p[0];
	}
      else
	fib_index[i] = ~0;
    }
  sw_if_index = ntohl (mp->sw_if_index);

  VALIDATE_SW_IF_INDEX (mp);

  rv =
    set_ip_source_and_port_range_check (vm, fib_index, sw_if_index,
					mp->is_add);

  BAD_SW_IF_INDEX_LABEL;
reply:

  REPLY_MACRO (VL_API_IP_SOURCE_AND_PORT_RANGE_CHECK_INTERFACE_ADD_DEL_REPLY);
}

static void
  vl_api_sw_interface_ip6_set_link_local_address_t_handler
  (vl_api_sw_interface_ip6_set_link_local_address_t * mp)
{
  vl_api_sw_interface_ip6_set_link_local_address_reply_t *rmp;
  ip6_address_t ip;
  int rv;

  VALIDATE_SW_IF_INDEX (mp);

  ip6_address_decode (mp->ip, &ip);

  rv = ip6_link_set_local_address (ntohl (mp->sw_if_index), &ip);

  BAD_SW_IF_INDEX_LABEL;
  REPLY_MACRO (VL_API_SW_INTERFACE_IP6_SET_LINK_LOCAL_ADDRESS_REPLY);
}

static void
vl_api_sw_interface_ip6_get_link_local_address_t_handler (
  vl_api_sw_interface_ip6_get_link_local_address_t *mp)
{
  vl_api_sw_interface_ip6_get_link_local_address_reply_t *rmp;
  const ip6_address_t *ip = NULL;
  int rv = 0;

  VALIDATE_SW_IF_INDEX (mp);

  ip = ip6_get_link_local_address (ntohl (mp->sw_if_index));
  if (NULL == ip)
    rv = VNET_API_ERROR_IP6_NOT_ENABLED;

  BAD_SW_IF_INDEX_LABEL;
  /* clang-format off */
  REPLY_MACRO2 (VL_API_SW_INTERFACE_IP6_GET_LINK_LOCAL_ADDRESS_REPLY,
  ({
    if (!rv)
      ip6_address_encode (ip, rmp->ip);
  }))
  /* clang-format on */
}

static void
vl_api_ip_table_replace_begin_t_handler (vl_api_ip_table_replace_begin_t * mp)
{
  vl_api_ip_table_replace_begin_reply_t *rmp;
  fib_protocol_t fproto;
  u32 fib_index;
  int rv = 0;

  fproto = (mp->table.is_ip6 ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
  fib_index = fib_table_find (fproto, ntohl (mp->table.table_id));

  if (INDEX_INVALID == fib_index)
    rv = VNET_API_ERROR_NO_SUCH_FIB;
  else
    {
      fib_table_mark (fib_index, fproto, FIB_SOURCE_API);
      mfib_table_mark (mfib_table_find (fproto, ntohl (mp->table.table_id)),
		       fproto, MFIB_SOURCE_API);
    }
  REPLY_MACRO (VL_API_IP_TABLE_REPLACE_BEGIN_REPLY);
}

static void
vl_api_ip_table_replace_end_t_handler (vl_api_ip_table_replace_end_t * mp)
{
  vl_api_ip_table_replace_end_reply_t *rmp;
  fib_protocol_t fproto;
  u32 fib_index;
  int rv = 0;

  fproto = (mp->table.is_ip6 ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
  fib_index = fib_table_find (fproto, ntohl (mp->table.table_id));

  if (INDEX_INVALID == fib_index)
    rv = VNET_API_ERROR_NO_SUCH_FIB;
  else
    {
      fib_table_sweep (fib_index, fproto, FIB_SOURCE_API);
      mfib_table_sweep (mfib_table_find
			(fproto, ntohl (mp->table.table_id)), fproto,
			MFIB_SOURCE_API);
    }
  REPLY_MACRO (VL_API_IP_TABLE_REPLACE_END_REPLY);
}

static void
vl_api_ip_table_flush_t_handler (vl_api_ip_table_flush_t * mp)
{
  vl_api_ip_table_flush_reply_t *rmp;
  fib_protocol_t fproto;
  u32 fib_index;
  int rv = 0;

  fproto = (mp->table.is_ip6 ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
  fib_index = fib_table_find (fproto, ntohl (mp->table.table_id));

  if (INDEX_INVALID == fib_index)
    rv = VNET_API_ERROR_NO_SUCH_FIB;
  else
    {
      vnet_main_t *vnm = vnet_get_main ();
      vnet_interface_main_t *im = &vnm->interface_main;
      vnet_sw_interface_t *si;

      /* Shut down interfaces in this FIB / clean out intfc routes */
      pool_foreach (si, im->sw_interfaces)
       {
        if (fib_index == fib_table_get_index_for_sw_if_index (fproto,
                                                              si->sw_if_index))
          {
            u32 flags = si->flags;
            flags &= ~VNET_SW_INTERFACE_FLAG_ADMIN_UP;
            vnet_sw_interface_set_flags (vnm, si->sw_if_index, flags);
          }
      }

      fib_table_flush (fib_index, fproto, FIB_SOURCE_API);
      mfib_table_flush (mfib_table_find (fproto, ntohl (mp->table.table_id)),
			fproto, MFIB_SOURCE_API);
    }

  REPLY_MACRO (VL_API_IP_TABLE_FLUSH_REPLY);
}

void
vl_api_ip_reassembly_set_t_handler (vl_api_ip_reassembly_set_t * mp)
{
  vl_api_ip_reassembly_set_reply_t *rmp;
  int rv = 0;
  switch ((vl_api_ip_reass_type_t) clib_net_to_host_u32 (mp->type))
    {
    case IP_REASS_TYPE_FULL:
      if (mp->is_ip6)
	{
	  rv = ip6_full_reass_set (clib_net_to_host_u32 (mp->timeout_ms),
				   clib_net_to_host_u32
				   (mp->max_reassemblies),
				   clib_net_to_host_u32
				   (mp->max_reassembly_length),
				   clib_net_to_host_u32
				   (mp->expire_walk_interval_ms));
	}
      else
	{
	  rv = ip4_full_reass_set (clib_net_to_host_u32 (mp->timeout_ms),
				   clib_net_to_host_u32
				   (mp->max_reassemblies),
				   clib_net_to_host_u32
				   (mp->max_reassembly_length),
				   clib_net_to_host_u32
				   (mp->expire_walk_interval_ms));
	}
      break;
    case IP_REASS_TYPE_SHALLOW_VIRTUAL:
      if (mp->is_ip6)
	{
	  rv =
	    ip6_sv_reass_set (clib_net_to_host_u32 (mp->timeout_ms),
			      clib_net_to_host_u32 (mp->max_reassemblies),
			      clib_net_to_host_u32
			      (mp->max_reassembly_length),
			      clib_net_to_host_u32
			      (mp->expire_walk_interval_ms));
	}
      else
	{
	  rv = ip4_sv_reass_set (clib_net_to_host_u32 (mp->timeout_ms),
				 clib_net_to_host_u32 (mp->max_reassemblies),
				 clib_net_to_host_u32
				 (mp->max_reassembly_length),
				 clib_net_to_host_u32
				 (mp->expire_walk_interval_ms));
	}
      break;
    }

  REPLY_MACRO (VL_API_IP_REASSEMBLY_SET_REPLY);
}

void
vl_api_ip_reassembly_get_t_handler (vl_api_ip_reassembly_get_t * mp)
{
  vl_api_registration_t *rp;

  rp = vl_api_client_index_to_registration (mp->client_index);
  if (rp == 0)
    return;

  vl_api_ip_reassembly_get_reply_t *rmp = vl_msg_api_alloc (sizeof (*rmp));
  clib_memset (rmp, 0, sizeof (*rmp));
  rmp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_IP_REASSEMBLY_GET_REPLY);
  rmp->context = mp->context;
  rmp->retval = 0;
  u32 timeout_ms;
  u32 max_reassemblies;
  u32 max_reassembly_length;
  u32 expire_walk_interval_ms;
  switch ((vl_api_ip_reass_type_t) clib_net_to_host_u32 (mp->type))
    {
    case IP_REASS_TYPE_FULL:
      if (mp->is_ip6)
	{
	  rmp->is_ip6 = 1;
	  ip6_full_reass_get (&timeout_ms, &max_reassemblies,
			      &max_reassembly_length,
			      &expire_walk_interval_ms);
	}
      else
	{
	  rmp->is_ip6 = 0;
	  ip4_full_reass_get (&timeout_ms, &max_reassemblies,
			      &max_reassembly_length,
			      &expire_walk_interval_ms);
	}
      break;
    case IP_REASS_TYPE_SHALLOW_VIRTUAL:
      if (mp->is_ip6)
	{
	  rmp->is_ip6 = 1;
	  ip6_sv_reass_get (&timeout_ms, &max_reassemblies,
			    &max_reassembly_length, &expire_walk_interval_ms);
	}
      else
	{
	  rmp->is_ip6 = 0;
	  ip4_sv_reass_get (&timeout_ms, &max_reassemblies,
			    &max_reassembly_length, &expire_walk_interval_ms);
	}
      break;
    }
  rmp->timeout_ms = clib_host_to_net_u32 (timeout_ms);
  rmp->max_reassemblies = clib_host_to_net_u32 (max_reassemblies);
  rmp->max_reassembly_length = clib_host_to_net_u32 (max_reassembly_length);
  rmp->expire_walk_interval_ms =
    clib_host_to_net_u32 (expire_walk_interval_ms);
  vl_api_send_msg (rp, (u8 *) rmp);
}

void
  vl_api_ip_reassembly_enable_disable_t_handler
  (vl_api_ip_reassembly_enable_disable_t * mp)
{
  vl_api_ip_reassembly_enable_disable_reply_t *rmp;
  int rv = 0;
  switch ((vl_api_ip_reass_type_t) clib_net_to_host_u32 (mp->type))
    {
    case IP_REASS_TYPE_FULL:
      rv =
	ip4_full_reass_enable_disable (clib_net_to_host_u32 (mp->sw_if_index),
				       mp->enable_ip4);
      if (0 == rv)
	rv =
	  ip6_full_reass_enable_disable (clib_net_to_host_u32
					 (mp->sw_if_index), mp->enable_ip6);
      break;
    case IP_REASS_TYPE_SHALLOW_VIRTUAL:
      rv =
	ip4_sv_reass_enable_disable (clib_net_to_host_u32 (mp->sw_if_index),
				     mp->enable_ip4);
      if (0 == rv)
	{
	  rv =
	    ip6_sv_reass_enable_disable (clib_net_to_host_u32
					 (mp->sw_if_index), mp->enable_ip6);
	}
      break;
    }

  REPLY_MACRO (VL_API_IP_REASSEMBLY_ENABLE_DISABLE_REPLY);
}

void
vl_api_ip_local_reass_enable_disable_t_handler (
  vl_api_ip_local_reass_enable_disable_t *mp)
{
  vl_api_ip_local_reass_enable_disable_reply_t *rmp;
  int rv = 0;

  ip4_local_full_reass_enable_disable (mp->enable_ip4);
  ip6_local_full_reass_enable_disable (mp->enable_ip6);

  REPLY_MACRO (VL_API_IP_LOCAL_REASS_ENABLE_DISABLE_REPLY);
}

void
vl_api_ip_local_reass_get_t_handler (vl_api_ip_local_reass_get_t *mp)
{
  vl_api_ip_local_reass_get_reply_t *rmp;
  int rv = 0;
  REPLY_MACRO2 (VL_API_IP_LOCAL_REASS_GET, {
    rmp->ip4_is_enabled = ip4_local_full_reass_enabled ();
    rmp->ip6_is_enabled = ip6_local_full_reass_enabled ();
  });
}

static walk_rc_t
send_ip_punt_redirect_details (u32 rx_sw_if_index,
			       const ip_punt_redirect_rx_t * ipr, void *arg)
{
  vl_api_ip_punt_redirect_details_t *mp;
  fib_path_encode_ctx_t path_ctx = {
    .rpaths = NULL,
  };
  ip_walk_ctx_t *ctx = arg;

  mp = vl_msg_api_alloc (sizeof (*mp));
  if (!mp)
    return (WALK_STOP);;

  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (REPLY_MSG_ID_BASE + VL_API_IP_PUNT_REDIRECT_DETAILS);
  mp->context = ctx->context;

  fib_path_list_walk_w_ext (ipr->pl, NULL, fib_path_encode, &path_ctx);

  mp->punt.rx_sw_if_index = htonl (rx_sw_if_index);
  mp->punt.tx_sw_if_index = htonl (path_ctx.rpaths[0].frp_sw_if_index);

  ip_address_encode (&path_ctx.rpaths[0].frp_addr,
		     fib_proto_to_ip46 (ipr->fproto), &mp->punt.nh);

  vl_api_send_msg (ctx->reg, (u8 *) mp);

  vec_free (path_ctx.rpaths);

  return (WALK_CONTINUE);
}

static walk_rc_t
send_ip_punt_redirect_v2_details (u32 rx_sw_if_index,
				  const ip_punt_redirect_rx_t *ipr, void *arg)
{
  vl_api_ip_punt_redirect_v2_details_t *mp;
  fib_path_encode_ctx_t path_ctx = {
    .rpaths = NULL,
  };
  fib_route_path_t *rpath;
  ip_walk_ctx_t *ctx = arg;
  vl_api_fib_path_t *fp;
  int n_paths;

  fib_path_list_walk_w_ext (ipr->pl, NULL, fib_path_encode, &path_ctx);

  n_paths = vec_len (path_ctx.rpaths);
  mp = vl_msg_api_alloc (sizeof (*mp) + n_paths * sizeof (*fp));
  if (!mp)
    return (WALK_STOP);

  clib_memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id =
    ntohs (REPLY_MSG_ID_BASE + VL_API_IP_PUNT_REDIRECT_V2_DETAILS);
  mp->context = ctx->context;
  mp->punt.rx_sw_if_index = htonl (rx_sw_if_index);
  mp->punt.n_paths = htonl (n_paths);
  fp = mp->punt.paths;
  vec_foreach (rpath, path_ctx.rpaths)
    {
      fib_api_path_encode (rpath, fp);
      fp++;
    }
  mp->punt.af = (ipr->fproto == FIB_PROTOCOL_IP6) ? ADDRESS_IP6 : ADDRESS_IP4;

  vl_api_send_msg (ctx->reg, (u8 *) mp);

  vec_free (path_ctx.rpaths);

  return (WALK_CONTINUE);
}

static void
vl_api_ip_punt_redirect_dump_common (ip_walk_ctx_t *ctx, fib_protocol_t fproto,
				     u32 rx_sw_if_index,
				     ip_punt_redirect_walk_cb_t cb)
{

  if ((u32) ~0 != rx_sw_if_index)
    {
      index_t pri;
      pri = ip_punt_redirect_find (fproto, rx_sw_if_index);

      if (INDEX_INVALID == pri)
	return;

      cb (rx_sw_if_index, ip_punt_redirect_get (pri), ctx);
    }
  else
    ip_punt_redirect_walk (fproto, cb, ctx);
}

static void
vl_api_ip_punt_redirect_dump_t_handler (vl_api_ip_punt_redirect_dump_t * mp)
{
  vl_api_registration_t *reg;
  fib_protocol_t fproto;

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  fproto = (mp->is_ipv6 == 1) ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4;

  ip_walk_ctx_t ctx = {
    .reg = reg,
    .context = mp->context,
  };

  vl_api_ip_punt_redirect_dump_common (&ctx, fproto, ntohl (mp->sw_if_index),
				       send_ip_punt_redirect_details);
}

static void
vl_api_ip_punt_redirect_v2_dump_t_handler (
  vl_api_ip_punt_redirect_v2_dump_t *mp)
{
  vl_api_registration_t *reg;
  ip_address_family_t af;
  fib_protocol_t fproto;
  int rv = 0;

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  rv = ip_address_family_decode (mp->af, &af);
  if (rv != 0)
    return;

  fproto = (af == AF_IP6) ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4;

  ip_walk_ctx_t ctx = {
    .reg = reg,
    .context = mp->context,
  };

  vl_api_ip_punt_redirect_dump_common (&ctx, fproto, ntohl (mp->sw_if_index),
				       send_ip_punt_redirect_v2_details);
}

void
vl_api_ip_path_mtu_update_t_handler (vl_api_ip_path_mtu_update_t *mp)
{
  vl_api_ip_path_mtu_update_reply_t *rmp;
  ip_address_t nh;
  int rv = 0;

  ip_address_decode2 (&mp->pmtu.nh, &nh);

  rv = ip_path_mtu_update (&nh, ntohl (mp->pmtu.table_id),
			   ntohs (mp->pmtu.path_mtu));

  REPLY_MACRO (VL_API_IP_PATH_MTU_UPDATE_REPLY);
}

void
vl_api_ip_path_mtu_replace_begin_t_handler (
  vl_api_ip_path_mtu_replace_begin_t *mp)
{
  vl_api_ip_path_mtu_replace_begin_reply_t *rmp;
  int rv;

  rv = ip_path_mtu_replace_begin ();

  REPLY_MACRO (VL_API_IP_PATH_MTU_REPLACE_BEGIN_REPLY);
}

void
vl_api_ip_path_mtu_replace_end_t_handler (vl_api_ip_path_mtu_replace_end_t *mp)
{
  vl_api_ip_path_mtu_replace_end_reply_t *rmp;
  int rv;

  rv = ip_path_mtu_replace_end ();

  REPLY_MACRO (VL_API_IP_PATH_MTU_REPLACE_END_REPLY);
}

static void
send_ip_path_mtu_details (index_t ipti, vl_api_registration_t *rp, u32 context)
{
  vl_api_ip_path_mtu_details_t *rmp;
  ip_address_t ip;
  ip_pmtu_t *ipt;

  ipt = ip_path_mtu_get (ipti);

  REPLY_MACRO_DETAILS4 (VL_API_IP_PATH_MTU_DETAILS, rp, context, ({
			  ip_pmtu_get_ip (ipt, &ip);
			  ip_address_encode2 (&ip, &rmp->pmtu.nh);
			  rmp->pmtu.table_id =
			    htonl (ip_pmtu_get_table_id (ipt));
			  rmp->pmtu.path_mtu = htons (ipt->ipt_cfg_pmtu);
			}));
}

static void
vl_api_ip_path_mtu_get_t_handler (vl_api_ip_path_mtu_get_t *mp)
{
  vl_api_ip_path_mtu_get_reply_t *rmp;
  i32 rv = 0;

  REPLY_AND_DETAILS_MACRO (
    VL_API_IP_PATH_MTU_GET_REPLY, ip_pmtu_pool,
    ({ send_ip_path_mtu_details (cursor, rp, mp->context); }));
}

#include <vnet/ip/ip.api.c>

static clib_error_t *
ip_api_hookup (vlib_main_t * vm)
{
  api_main_t *am = vlibapi_get_main ();

  /*
   * Set up the (msg_name, crc, message-id) table
   */
  REPLY_MSG_ID_BASE = setup_message_id_table ();

  /*
   * Mark the route add/del API as MP safe
   */
  vl_api_set_msg_thread_safe (am, REPLY_MSG_ID_BASE + VL_API_IP_ROUTE_ADD_DEL,
			      1);
  vl_api_set_msg_thread_safe (
    am, REPLY_MSG_ID_BASE + VL_API_IP_ROUTE_ADD_DEL_REPLY, 1);
  vl_api_set_msg_thread_safe (
    am, REPLY_MSG_ID_BASE + VL_API_IP_ROUTE_ADD_DEL_V2, 1);
  vl_api_set_msg_thread_safe (
    am, REPLY_MSG_ID_BASE + VL_API_IP_ROUTE_ADD_DEL_V2_REPLY, 1);

  return 0;
}

VLIB_API_INIT_FUNCTION (ip_api_hookup);

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