ip_api.c

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/*
 *------------------------------------------------------------------
 * 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/ip/ip.h>
#include <vnet/ip/ip_neighbor.h>
#include <vnet/ip/ip6_neighbor.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/fib_api.h>
#include <vnet/dpo/drop_dpo.h>
#include <vnet/dpo/receive_dpo.h>
#include <vnet/dpo/lookup_dpo.h>
#include <vnet/dpo/classify_dpo.h>
#include <vnet/dpo/ip_null_dpo.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/ip/ip_source_and_port_range_check.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/ip/ip6_hop_by_hop.h>
#include <vnet/ip/ip4_reassembly.h>
#include <vnet/ip/ip6_reassembly.h>
#include <vnet/ethernet/arp.h>

#include <vnet/vnet_msg_enum.h>

#define vl_typedefs             /* define message structures */
#include <vnet/vnet_all_api_h.h>
#undef vl_typedefs

#define vl_endianfun            /* define message structures */
#include <vnet/vnet_all_api_h.h>
#undef vl_endianfun

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

#include <vlibapi/api_helper_macros.h>


#define foreach_ip_api_msg                                              \
_(IP_FIB_DUMP, ip_fib_dump)                                             \
_(IP6_FIB_DUMP, ip6_fib_dump)                                           \
_(IP_MFIB_DUMP, ip_mfib_dump)                                           \
_(IP6_MFIB_DUMP, ip6_mfib_dump)                                         \
_(IP_NEIGHBOR_DUMP, ip_neighbor_dump)                                   \
_(IP_MROUTE_ADD_DEL, ip_mroute_add_del)                                 \
_(MFIB_SIGNAL_DUMP, mfib_signal_dump)                                   \
_(IP_ADDRESS_DUMP, ip_address_dump)                                     \
_(IP_UNNUMBERED_DUMP, ip_unnumbered_dump)                               \
_(IP_DUMP, ip_dump)                                                     \
_(IP_NEIGHBOR_ADD_DEL, ip_neighbor_add_del)                             \
_(SET_ARP_NEIGHBOR_LIMIT, set_arp_neighbor_limit)                       \
_(IP_PROBE_NEIGHBOR, ip_probe_neighbor)                                 \
_(IP_SCAN_NEIGHBOR_ENABLE_DISABLE, ip_scan_neighbor_enable_disable)     \
_(WANT_IP4_ARP_EVENTS, want_ip4_arp_events)                             \
_(WANT_IP6_ND_EVENTS, want_ip6_nd_events)                               \
_(WANT_IP6_RA_EVENTS, want_ip6_ra_events)                               \
_(PROXY_ARP_ADD_DEL, proxy_arp_add_del)                                 \
_(PROXY_ARP_DUMP, proxy_arp_dump)                                       \
_(PROXY_ARP_INTFC_ENABLE_DISABLE, proxy_arp_intfc_enable_disable)       \
 _(PROXY_ARP_INTFC_DUMP, proxy_arp_intfc_dump)                          \
_(RESET_FIB, reset_fib)                                                 \
_(IP_ADD_DEL_ROUTE, ip_add_del_route)                                   \
_(IP_TABLE_ADD_DEL, ip_table_add_del)                                   \
_(IP_PUNT_POLICE, ip_punt_police)                                       \
_(IP_PUNT_REDIRECT, ip_punt_redirect)                                   \
_(SET_IP_FLOW_HASH,set_ip_flow_hash)                                    \
_(SW_INTERFACE_IP6ND_RA_CONFIG, sw_interface_ip6nd_ra_config)           \
_(SW_INTERFACE_IP6ND_RA_PREFIX, sw_interface_ip6nd_ra_prefix)           \
_(IP6ND_PROXY_ADD_DEL, ip6nd_proxy_add_del)                             \
_(IP6ND_PROXY_DUMP, ip6nd_proxy_dump)                                   \
_(IP6ND_SEND_ROUTER_SOLICITATION, ip6nd_send_router_solicitation)       \
_(SW_INTERFACE_IP6_ENABLE_DISABLE, sw_interface_ip6_enable_disable )    \
_(SW_INTERFACE_IP6_SET_LINK_LOCAL_ADDRESS,                              \
  sw_interface_ip6_set_link_local_address)                              \
_(IP_CONTAINER_PROXY_ADD_DEL, ip_container_proxy_add_del)               \
_(IOAM_ENABLE, ioam_enable)                                             \
_(IOAM_DISABLE, ioam_disable)                                           \
_(IP_SOURCE_AND_PORT_RANGE_CHECK_ADD_DEL,                               \
  ip_source_and_port_range_check_add_del)                               \
_(IP_SOURCE_AND_PORT_RANGE_CHECK_INTERFACE_ADD_DEL,                     \
  ip_source_and_port_range_check_interface_add_del)                     \
_(IP_REASSEMBLY_SET, ip_reassembly_set)                                 \
_(IP_REASSEMBLY_GET, ip_reassembly_get)                                 \
_(IP_REASSEMBLY_ENABLE_DISABLE, ip_reassembly_enable_disable)

extern void stats_dslock_with_hint (int hint, int tag);
extern void stats_dsunlock (void);

static void
send_ip_neighbor_details (u32 sw_if_index,
                          u8 is_ipv6,
                          u8 is_static,
                          u8 * mac_address,
                          u8 * ip_address, vl_api_registration_t * reg,
                          u32 context)
{
  vl_api_ip_neighbor_details_t *mp;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_IP_NEIGHBOR_DETAILS);
  mp->context = context;
  mp->sw_if_index = htonl (sw_if_index);
  mp->is_ipv6 = is_ipv6;
  mp->is_static = is_static;
  memcpy (mp->mac_address, mac_address, 6);
  memcpy (mp->ip_address, ip_address, (is_ipv6) ? 16 : 4);

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

static void
vl_api_ip_neighbor_dump_t_handler (vl_api_ip_neighbor_dump_t * mp)
{
  vl_api_registration_t *reg;

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

  u32 sw_if_index = ntohl (mp->sw_if_index);

  if (mp->is_ipv6)
    {
      ip6_neighbor_t *n, *ns;

      ns = ip6_neighbors_entries (sw_if_index);
      /* *INDENT-OFF* */
      vec_foreach (n, ns)
      {
        send_ip_neighbor_details
          (n->key.sw_if_index, mp->is_ipv6,
           ((n->flags & IP6_NEIGHBOR_FLAG_STATIC) ? 1 : 0),
           (u8 *) n->link_layer_address,
           (u8 *) & (n->key.ip6_address.as_u8),
           reg, mp->context);
      }
      /* *INDENT-ON* */
      vec_free (ns);
    }
  else
    {
      ethernet_arp_ip4_entry_t *n, *ns;

      ns = ip4_neighbor_entries (sw_if_index);
      /* *INDENT-OFF* */
      vec_foreach (n, ns)
      {
        send_ip_neighbor_details (n->sw_if_index, mp->is_ipv6,
          ((n->flags & ETHERNET_ARP_IP4_ENTRY_FLAG_STATIC) ? 1 : 0),
          (u8*) n->ethernet_address,
          (u8*) & (n->ip4_address.as_u8),
          reg, mp->context);
      }
      /* *INDENT-ON* */
      vec_free (ns);
    }
}

static void
send_ip_fib_details (vpe_api_main_t * am,
                     vl_api_registration_t * reg,
                     const fib_table_t * table,
                     const fib_prefix_t * pfx,
                     fib_route_path_encode_t * api_rpaths, u32 context)
{
  vl_api_ip_fib_details_t *mp;
  fib_route_path_encode_t *api_rpath;
  vl_api_fib_path_t *fp;
  int path_count;

  path_count = vec_len (api_rpaths);
  mp = vl_msg_api_alloc (sizeof (*mp) + path_count * sizeof (*fp));
  if (!mp)
    return;
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_IP_FIB_DETAILS);
  mp->context = context;

  mp->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)));
  mp->address_length = pfx->fp_len;
  memcpy (mp->address, &pfx->fp_addr.ip4, sizeof (pfx->fp_addr.ip4));
  mp->stats_index =
    htonl (fib_table_entry_get_stats_index (table->ft_index, pfx));

  mp->count = htonl (path_count);
  fp = mp->path;
  vec_foreach (api_rpath, api_rpaths)
  {
    fib_api_path_encode (api_rpath, fp);
    fp++;
  }

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

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
vl_api_ip_fib_dump_t_handler (vl_api_ip_fib_dump_t * mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  vl_api_registration_t *reg;
  ip4_main_t *im = &ip4_main;
  fib_table_t *fib_table;
  fib_node_index_t *lfeip;
  const fib_prefix_t *pfx;
  u32 fib_index;
  fib_route_path_encode_t *api_rpaths;
  vl_api_ip_fib_dump_walk_ctx_t ctx = {
    .feis = NULL,
  };

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

  /* *INDENT-OFF* */
  pool_foreach (fib_table, im->fibs,
  ({
    fib_table_walk(fib_table->ft_index,
                   FIB_PROTOCOL_IP4,
                   vl_api_ip_fib_dump_walk,
                   &ctx);
  }));
  /* *INDENT-ON* */

  vec_sort_with_function (ctx.feis, fib_entry_cmp_for_sort);

  vec_foreach (lfeip, ctx.feis)
  {
    pfx = fib_entry_get_prefix (*lfeip);
    fib_index = fib_entry_get_fib_index (*lfeip);
    fib_table = fib_table_get (fib_index, pfx->fp_proto);
    api_rpaths = NULL;
    fib_entry_encode (*lfeip, &api_rpaths);
    send_ip_fib_details (am, reg, fib_table, pfx, api_rpaths, mp->context);
    vec_free (api_rpaths);
  }

  vec_free (ctx.feis);
}

static void
send_ip6_fib_details (vpe_api_main_t * am,
                      vl_api_registration_t * reg,
                      const fib_table_t * table,
                      const fib_prefix_t * pfx,
                      fib_route_path_encode_t * api_rpaths, u32 context)
{
  vl_api_ip6_fib_details_t *mp;
  fib_route_path_encode_t *api_rpath;
  vl_api_fib_path_t *fp;
  int path_count;

  path_count = vec_len (api_rpaths);
  mp = vl_msg_api_alloc (sizeof (*mp) + path_count * sizeof (*fp));
  if (!mp)
    return;
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_IP6_FIB_DETAILS);
  mp->context = context;

  mp->table_id = htonl (table->ft_table_id);
  mp->address_length = pfx->fp_len;
  memcpy (mp->address, &pfx->fp_addr.ip6, sizeof (pfx->fp_addr.ip6));
  memcpy (mp->table_name, table->ft_desc,
          clib_min (vec_len (table->ft_desc), sizeof (mp->table_name)));
  mp->stats_index =
    htonl (fib_table_entry_get_stats_index (table->ft_index, pfx));

  mp->count = htonl (path_count);
  fp = mp->path;
  vec_foreach (api_rpath, api_rpaths)
  {
    fib_api_path_encode (api_rpath, fp);
    fp++;
  }

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

typedef struct apt_ip6_fib_show_ctx_t_
{
  u32 fib_index;
  fib_node_index_t *entries;
} api_ip6_fib_show_ctx_t;

static void
api_ip6_fib_table_put_entries (clib_bihash_kv_24_8_t * kvp, void *arg)
{
  api_ip6_fib_show_ctx_t *ctx = arg;

  if ((kvp->key[2] >> 32) == ctx->fib_index)
    {
      vec_add1 (ctx->entries, kvp->value);
    }
}

static void
api_ip6_fib_table_get_all (vl_api_registration_t * reg,
                           vl_api_ip6_fib_dump_t * mp,
                           fib_table_t * fib_table)
{
  vpe_api_main_t *am = &vpe_api_main;
  ip6_main_t *im6 = &ip6_main;
  fib_node_index_t *fib_entry_index;
  api_ip6_fib_show_ctx_t ctx = {
    .fib_index = fib_table->ft_index,
    .entries = NULL,
  };
  fib_route_path_encode_t *api_rpaths;
  const fib_prefix_t *pfx;

  BV (clib_bihash_foreach_key_value_pair)
    ((BVT (clib_bihash) *) & im6->ip6_table[IP6_FIB_TABLE_NON_FWDING].
     ip6_hash, api_ip6_fib_table_put_entries, &ctx);

  vec_sort_with_function (ctx.entries, fib_entry_cmp_for_sort);

  vec_foreach (fib_entry_index, ctx.entries)
  {
    pfx = fib_entry_get_prefix (*fib_entry_index);
    api_rpaths = NULL;
    fib_entry_encode (*fib_entry_index, &api_rpaths);
    send_ip6_fib_details (am, reg, fib_table, pfx, api_rpaths, mp->context);
    vec_free (api_rpaths);
  }

  vec_free (ctx.entries);
}

static void
vl_api_ip6_fib_dump_t_handler (vl_api_ip6_fib_dump_t * mp)
{
  vl_api_registration_t *reg;
  ip6_main_t *im6 = &ip6_main;
  fib_table_t *fib_table;

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

  /* *INDENT-OFF* */
  pool_foreach (fib_table, im6->fibs,
  ({
    /* don't send link locals */
    if (fib_table->ft_flags & FIB_TABLE_FLAG_IP6_LL)
      continue;

    api_ip6_fib_table_get_all(reg, mp, fib_table);
  }));
  /* *INDENT-ON* */
}

static void
send_ip_mfib_details (vl_api_registration_t * reg,
                      u32 context, u32 table_id, fib_node_index_t mfei)
{
  fib_route_path_encode_t *api_rpath, *api_rpaths = NULL;
  vl_api_ip_mfib_details_t *mp;
  mfib_entry_t *mfib_entry;
  vl_api_fib_path_t *fp;
  mfib_prefix_t pfx;
  int path_count;

  mfib_entry = mfib_entry_get (mfei);
  mfib_entry_get_prefix (mfei, &pfx);
  mfib_entry_encode (mfei, &api_rpaths);

  path_count = vec_len (api_rpaths);
  mp = vl_msg_api_alloc (sizeof (*mp) + path_count * sizeof (*fp));
  if (!mp)
    return;
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_IP_MFIB_DETAILS);
  mp->context = context;

  mp->rpf_id = mfib_entry->mfe_rpf_id;
  mp->entry_flags = mfib_entry->mfe_flags;
  mp->table_id = htonl (table_id);
  mp->address_length = pfx.fp_len;
  memcpy (mp->grp_address, &pfx.fp_grp_addr.ip4,
          sizeof (pfx.fp_grp_addr.ip4));
  memcpy (mp->src_address, &pfx.fp_src_addr.ip4,
          sizeof (pfx.fp_src_addr.ip4));

  mp->count = htonl (path_count);
  fp = mp->path;
  vec_foreach (api_rpath, api_rpaths)
  {
    fib_api_path_encode (api_rpath, fp);
    fp++;
  }
  vec_free (api_rpaths);

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

typedef struct vl_api_ip_mfib_dump_ctc_t_
{
  fib_node_index_t *entries;
} vl_api_ip_mfib_dump_ctc_t;

static int
vl_api_ip_mfib_table_dump_walk (fib_node_index_t fei, void *arg)
{
  vl_api_ip_mfib_dump_ctc_t *ctx = arg;

  vec_add1 (ctx->entries, fei);

  return (0);
}

static void
vl_api_ip_mfib_dump_t_handler (vl_api_ip_mfib_dump_t * mp)
{
  vl_api_registration_t *reg;
  ip4_main_t *im = &ip4_main;
  mfib_table_t *mfib_table;
  fib_node_index_t *mfeip;
  vl_api_ip_mfib_dump_ctc_t ctx = {
    .entries = NULL,
  };

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

  /* *INDENT-OFF* */
  pool_foreach (mfib_table, im->mfibs,
  ({
    ip4_mfib_table_walk(&mfib_table->v4,
                        vl_api_ip_mfib_table_dump_walk,
                        &ctx);

    vec_sort_with_function (ctx.entries, mfib_entry_cmp_for_sort);

    vec_foreach (mfeip, ctx.entries)
    {
      send_ip_mfib_details (reg, mp->context,
                            mfib_table->mft_table_id,
                            *mfeip);
    }
    vec_reset_length (ctx.entries);

  }));
  /* *INDENT-ON* */

  vec_free (ctx.entries);
}

static void
send_ip6_mfib_details (vpe_api_main_t * am,
                       vl_api_registration_t * reg,
                       u32 table_id,
                       mfib_prefix_t * pfx,
                       fib_route_path_encode_t * api_rpaths, u32 context)
{
  vl_api_ip6_mfib_details_t *mp;
  fib_route_path_encode_t *api_rpath;
  vl_api_fib_path_t *fp;
  int path_count;

  path_count = vec_len (api_rpaths);
  mp = vl_msg_api_alloc (sizeof (*mp) + path_count * sizeof (*fp));
  if (!mp)
    return;
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_IP6_MFIB_DETAILS);
  mp->context = context;

  mp->table_id = htonl (table_id);
  mp->address_length = pfx->fp_len;
  memcpy (mp->grp_address, &pfx->fp_grp_addr.ip6,
          sizeof (pfx->fp_grp_addr.ip6));
  memcpy (mp->src_address, &pfx->fp_src_addr.ip6,
          sizeof (pfx->fp_src_addr.ip6));

  mp->count = htonl (path_count);
  fp = mp->path;
  vec_foreach (api_rpath, api_rpaths)
  {
    fib_api_path_encode (api_rpath, fp);
    fp++;
  }

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

typedef struct vl_api_ip6_mfib_dump_ctc_t_
{
  fib_node_index_t *entries;
} vl_api_ip6_mfib_dump_ctc_t;

static int
vl_api_ip6_mfib_table_dump_walk (fib_node_index_t fei, void *arg)
{
  vl_api_ip6_mfib_dump_ctc_t *ctx = arg;

  vec_add1 (ctx->entries, fei);

  return (0);
}

static void
vl_api_ip6_mfib_dump_t_handler (vl_api_ip6_mfib_dump_t * mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  vl_api_registration_t *reg;
  ip6_main_t *im = &ip6_main;
  mfib_table_t *mfib_table;
  fib_node_index_t *mfeip;
  mfib_prefix_t pfx;
  fib_route_path_encode_t *api_rpaths = NULL;
  vl_api_ip6_mfib_dump_ctc_t ctx = {
    .entries = NULL,
  };

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


  /* *INDENT-OFF* */
  pool_foreach (mfib_table, im->mfibs,
  ({
    ip6_mfib_table_walk(&mfib_table->v6,
                        vl_api_ip6_mfib_table_dump_walk,
                        &ctx);

    vec_sort_with_function (ctx.entries, mfib_entry_cmp_for_sort);

    vec_foreach(mfeip, ctx.entries)
    {
      mfib_entry_get_prefix (*mfeip, &pfx);
      mfib_entry_encode (*mfeip, &api_rpaths);
      send_ip6_mfib_details (am, reg,
                             mfib_table->mft_table_id,
                             &pfx, api_rpaths,
                             mp->context);
    }
    vec_reset_length (api_rpaths);
    vec_reset_length (ctx.entries);

  }));
  /* *INDENT-ON* */

  vec_free (ctx.entries);
  vec_free (api_rpaths);
}

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
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;
  int rv = 0;

  if (mp->is_add)
    {
      ip46_address_t nh;

      memset (&nh, 0, sizeof (nh));

      if (mp->is_ip6)
        {
          memcpy (&nh.ip6, mp->nh, sizeof (nh.ip6));

          ip6_punt_redirect_add (ntohl (mp->rx_sw_if_index),
                                 ntohl (mp->tx_sw_if_index), &nh);
        }
      else
        {
          memcpy (&nh.ip4, mp->nh, sizeof (nh.ip4));

          ip4_punt_redirect_add (ntohl (mp->rx_sw_if_index),
                                 ntohl (mp->tx_sw_if_index), &nh);
        }
    }
  else
    {
      if (mp->is_ip6)
        {
          ip6_punt_redirect_del (ntohl (mp->rx_sw_if_index));
        }
      else
        {
          ip4_punt_redirect_del (ntohl (mp->rx_sw_if_index));
        }
    }

  REPLY_MACRO (VL_API_IP_PUNT_REDIRECT_REPLY);
}

static void
vl_api_ip_neighbor_add_del_t_handler (vl_api_ip_neighbor_add_del_t * mp,
                                      vlib_main_t * vm)
{
  ip46_address_t ip = ip46_address_initializer;
  vl_api_ip_neighbor_add_del_reply_t *rmp;
  ip_neighbor_flags_t flags;
  u32 stats_index = ~0;
  int rv = 0;

  VALIDATE_SW_IF_INDEX (mp);

  stats_dslock_with_hint (1 /* release hint */ , 7 /* tag */ );

  flags = IP_NEIGHBOR_FLAG_NODE;
  if (mp->is_static)
    flags |= IP_NEIGHBOR_FLAG_STATIC;
  if (mp->is_no_adj_fib)
    flags |= IP_NEIGHBOR_FLAG_NO_ADJ_FIB;

  if (mp->is_ipv6)
    clib_memcpy (&ip.ip6, mp->dst_address, 16);
  else
    clib_memcpy (&ip.ip4, mp->dst_address, 4);

  if (mp->is_add)
    rv = ip_neighbor_add (&ip, mp->is_ipv6, mp->mac_address,
                          ntohl (mp->sw_if_index), flags, &stats_index);
  else
    rv = ip_neighbor_del (&ip, mp->is_ipv6, ntohl (mp->sw_if_index));

  stats_dsunlock ();

  BAD_SW_IF_INDEX_LABEL;

  /* *INDENT-OFF* */
  REPLY_MACRO2 (VL_API_IP_NEIGHBOR_ADD_DEL_REPLY,
  ({
    rmp->stats_index = htonl (stats_index);
  }));
  /* *INDENT-ON* */
}

void
ip_table_delete (fib_protocol_t fproto, u32 table_id, u8 is_api)
{
  u32 fib_index, mfib_index;

  /*
   * 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)
        {
          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));
        }
    }
}

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->is_ipv6 ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
  u32 table_id = ntohl (mp->table_id);
  int rv = 0;

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

  REPLY_MACRO (VL_API_IP_TABLE_ADD_DEL_REPLY);
}

int
add_del_route_t_handler (u8 is_multipath,
                         u8 is_add,
                         u8 is_drop,
                         u8 is_unreach,
                         u8 is_prohibit,
                         u8 is_local,
                         u8 is_multicast,
                         u8 is_classify,
                         u32 classify_table_index,
                         u8 is_resolve_host,
                         u8 is_resolve_attached,
                         u8 is_interface_rx,
                         u8 is_rpf_id,
                         u8 is_dvr,
                         u8 is_source_lookup,
                         u8 is_udp_encap,
                         u32 fib_index,
                         const fib_prefix_t * prefix,
                         dpo_proto_t next_hop_proto,
                         const ip46_address_t * next_hop,
                         u32 next_hop_id,
                         u32 next_hop_sw_if_index,
                         u8 next_hop_fib_index,
                         u16 next_hop_weight,
                         u16 next_hop_preference,
                         mpls_label_t next_hop_via_label,
                         fib_mpls_label_t * next_hop_out_label_stack)
{
  vnet_classify_main_t *cm = &vnet_classify_main;
  fib_route_path_flags_t path_flags = FIB_ROUTE_PATH_FLAG_NONE;
  fib_route_path_t path = {
    .frp_proto = next_hop_proto,
    .frp_addr = (NULL == next_hop ? zero_addr : *next_hop),
    .frp_sw_if_index = next_hop_sw_if_index,
    .frp_fib_index = next_hop_fib_index,
    .frp_weight = next_hop_weight,
    .frp_preference = next_hop_preference,
    .frp_label_stack = next_hop_out_label_stack,
  };
  fib_route_path_t *paths = NULL;
  fib_entry_flag_t entry_flags = FIB_ENTRY_FLAG_NONE;

  /*
   * the special INVALID label meams we are not recursing via a
   * label. Exp-null value is never a valid via-label so that
   * also means it's not a via-label and means clients that set
   * it to 0 by default get the expected behaviour
   */
  if ((MPLS_LABEL_INVALID != next_hop_via_label) && (0 != next_hop_via_label))
    {
      path.frp_proto = DPO_PROTO_MPLS;
      path.frp_local_label = next_hop_via_label;
      path.frp_eos = MPLS_NON_EOS;
    }
  if (is_dvr)
    path_flags |= FIB_ROUTE_PATH_DVR;
  if (is_resolve_host)
    path_flags |= FIB_ROUTE_PATH_RESOLVE_VIA_HOST;
  if (is_resolve_attached)
    path_flags |= FIB_ROUTE_PATH_RESOLVE_VIA_ATTACHED;
  if (is_interface_rx)
    path_flags |= FIB_ROUTE_PATH_INTF_RX;
  if (is_rpf_id)
    path_flags |= FIB_ROUTE_PATH_RPF_ID;
  if (is_source_lookup)
    path_flags |= FIB_ROUTE_PATH_SOURCE_LOOKUP;
  if (is_multicast)
    entry_flags |= FIB_ENTRY_FLAG_MULTICAST;
  if (is_udp_encap)
    {
      path_flags |= FIB_ROUTE_PATH_UDP_ENCAP;
      path.frp_udp_encap_id = next_hop_id;
    }
  if (path.frp_sw_if_index == ~0 && ip46_address_is_zero (&path.frp_addr)
      && path.frp_fib_index != ~0)
    {
      path_flags |= FIB_ROUTE_PATH_DEAG;
    }

  path.frp_flags = path_flags;

  stats_dslock_with_hint (1 /* release hint */ , 2 /* tag */ );

  if (is_drop || is_local || is_classify || is_unreach || is_prohibit)
    {
      /*
       * special route types that link directly to the adj
       */
      if (is_add)
        {
          dpo_id_t dpo = DPO_INVALID;
          dpo_proto_t dproto;

          dproto = fib_proto_to_dpo (prefix->fp_proto);

          if (is_drop)
            ip_null_dpo_add_and_lock (dproto, IP_NULL_ACTION_NONE, &dpo);
          else if (is_local)
            receive_dpo_add_or_lock (dproto, ~0, NULL, &dpo);
          else if (is_unreach)
            ip_null_dpo_add_and_lock (dproto,
                                      IP_NULL_ACTION_SEND_ICMP_UNREACH, &dpo);
          else if (is_prohibit)
            ip_null_dpo_add_and_lock (dproto,
                                      IP_NULL_ACTION_SEND_ICMP_PROHIBIT,
                                      &dpo);
          else if (is_classify)
            {
              if (pool_is_free_index (cm->tables,
                                      ntohl (classify_table_index)))
                {
                  stats_dsunlock ();
                  return VNET_API_ERROR_NO_SUCH_TABLE;
                }

              dpo_set (&dpo, DPO_CLASSIFY, dproto,
                       classify_dpo_create (dproto,
                                            ntohl (classify_table_index)));
            }
          else
            {
              stats_dsunlock ();
              return VNET_API_ERROR_NO_SUCH_TABLE;
            }

          fib_table_entry_special_dpo_update (fib_index,
                                              prefix,
                                              FIB_SOURCE_API,
                                              FIB_ENTRY_FLAG_EXCLUSIVE, &dpo);
          dpo_reset (&dpo);
        }
      else
        {
          fib_table_entry_special_remove (fib_index, prefix, FIB_SOURCE_API);
        }
    }
  else if (is_multipath)
    {
      vec_add1 (paths, path);

      if (is_add)
        fib_table_entry_path_add2 (fib_index,
                                   prefix,
                                   FIB_SOURCE_API, entry_flags, paths);
      else
        fib_table_entry_path_remove2 (fib_index,
                                      prefix, FIB_SOURCE_API, paths);

      vec_free (paths);
    }
  else
    {
      if (is_add)
        {
          vec_add1 (paths, path);
          fib_table_entry_update (fib_index,
                                  prefix, FIB_SOURCE_API, entry_flags, paths);
          vec_free (paths);
        }
      else
        {
          fib_table_entry_delete (fib_index, prefix, FIB_SOURCE_API);
        }
    }

  stats_dsunlock ();
  return (0);
}

int
add_del_route_check (fib_protocol_t table_proto,
                     u32 table_id,
                     u32 next_hop_sw_if_index,
                     dpo_proto_t next_hop_table_proto,
                     u32 next_hop_table_id,
                     u8 is_rpf_id, u32 * fib_index, u32 * next_hop_fib_index)
{
  vnet_main_t *vnm = vnet_get_main ();

  *fib_index = fib_table_find (table_proto, ntohl (table_id));
  if (~0 == *fib_index)
    {
      /* No such VRF, and we weren't asked to create one */
      return VNET_API_ERROR_NO_SUCH_FIB;
    }

  if (!is_rpf_id && ~0 != ntohl (next_hop_sw_if_index))
    {
      if (pool_is_free_index (vnm->interface_main.sw_interfaces,
                              ntohl (next_hop_sw_if_index)))
        {
          return VNET_API_ERROR_NO_MATCHING_INTERFACE;
        }
    }
  else
    {
      fib_protocol_t fib_nh_proto;

      if (next_hop_table_proto > DPO_PROTO_MPLS)
        return (0);

      fib_nh_proto = dpo_proto_to_fib (next_hop_table_proto);

      if (is_rpf_id)
        *next_hop_fib_index = mfib_table_find (fib_nh_proto,
                                               ntohl (next_hop_table_id));
      else
        *next_hop_fib_index = fib_table_find (fib_nh_proto,
                                              ntohl (next_hop_table_id));

      if (~0 == *next_hop_fib_index)
        {
          /* No such VRF, and we weren't asked to create one */
          return VNET_API_ERROR_NO_SUCH_FIB;
        }
    }

  return (0);
}

static int
ip4_add_del_route_t_handler (vl_api_ip_add_del_route_t * mp,
                             u32 * stats_index)
{
  u32 fib_index, next_hop_fib_index;
  fib_mpls_label_t *label_stack = NULL;
  int rv, ii, n_labels;;

  rv = add_del_route_check (FIB_PROTOCOL_IP4,
                            mp->table_id,
                            mp->next_hop_sw_if_index,
                            DPO_PROTO_IP4,
                            mp->next_hop_table_id,
                            0, &fib_index, &next_hop_fib_index);

  if (0 != rv)
    return (rv);

  fib_prefix_t pfx = {
    .fp_len = mp->dst_address_length,
    .fp_proto = FIB_PROTOCOL_IP4,
  };
  clib_memcpy (&pfx.fp_addr.ip4, mp->dst_address, sizeof (pfx.fp_addr.ip4));

  ip46_address_t nh;
  memset (&nh, 0, sizeof (nh));
  memcpy (&nh.ip4, mp->next_hop_address, sizeof (nh.ip4));

  n_labels = mp->next_hop_n_out_labels;
  if (n_labels == 0)
    ;
  else
    {
      vec_validate (label_stack, n_labels - 1);
      for (ii = 0; ii < n_labels; ii++)
        {
          label_stack[ii].fml_value =
            ntohl (mp->next_hop_out_label_stack[ii].label);
          label_stack[ii].fml_ttl = mp->next_hop_out_label_stack[ii].ttl;
          label_stack[ii].fml_exp = mp->next_hop_out_label_stack[ii].exp;
          label_stack[ii].fml_mode =
            (mp->next_hop_out_label_stack[ii].is_uniform ?
             FIB_MPLS_LSP_MODE_UNIFORM : FIB_MPLS_LSP_MODE_PIPE);
        }
    }

  rv = add_del_route_t_handler (mp->is_multipath,
                                mp->is_add,
                                mp->is_drop,
                                mp->is_unreach,
                                mp->is_prohibit,
                                mp->is_local, 0,
                                mp->is_classify,
                                mp->classify_table_index,
                                mp->is_resolve_host,
                                mp->is_resolve_attached, 0, 0,
                                mp->is_dvr,
                                mp->is_source_lookup,
                                mp->is_udp_encap,
                                fib_index, &pfx, DPO_PROTO_IP4,
                                &nh,
                                ntohl (mp->next_hop_id),
                                ntohl (mp->next_hop_sw_if_index),
                                next_hop_fib_index,
                                mp->next_hop_weight,
                                mp->next_hop_preference,
                                ntohl (mp->next_hop_via_label), label_stack);

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

  return (rv);
}

static int
ip6_add_del_route_t_handler (vl_api_ip_add_del_route_t * mp,
                             u32 * stats_index)
{
  fib_mpls_label_t *label_stack = NULL;
  u32 fib_index, next_hop_fib_index;
  int rv, ii, n_labels;;

  rv = add_del_route_check (FIB_PROTOCOL_IP6,
                            mp->table_id,
                            mp->next_hop_sw_if_index,
                            DPO_PROTO_IP6,
                            mp->next_hop_table_id,
                            0, &fib_index, &next_hop_fib_index);

  if (0 != rv)
    return (rv);

  fib_prefix_t pfx = {
    .fp_len = mp->dst_address_length,
    .fp_proto = FIB_PROTOCOL_IP6,
  };
  clib_memcpy (&pfx.fp_addr.ip6, mp->dst_address, sizeof (pfx.fp_addr.ip6));

  ip46_address_t nh;
  memset (&nh, 0, sizeof (nh));
  memcpy (&nh.ip6, mp->next_hop_address, sizeof (nh.ip6));

  n_labels = mp->next_hop_n_out_labels;
  if (n_labels == 0)
    ;
  else
    {
      vec_validate (label_stack, n_labels - 1);
      for (ii = 0; ii < n_labels; ii++)
        {
          label_stack[ii].fml_value =
            ntohl (mp->next_hop_out_label_stack[ii].label);
          label_stack[ii].fml_ttl = mp->next_hop_out_label_stack[ii].ttl;
          label_stack[ii].fml_exp = mp->next_hop_out_label_stack[ii].exp;
          label_stack[ii].fml_mode =
            (mp->next_hop_out_label_stack[ii].is_uniform ?
             FIB_MPLS_LSP_MODE_UNIFORM : FIB_MPLS_LSP_MODE_PIPE);
        }
    }

  rv = add_del_route_t_handler (mp->is_multipath,
                                mp->is_add,
                                mp->is_drop,
                                mp->is_unreach,
                                mp->is_prohibit,
                                mp->is_local, 0,
                                mp->is_classify,
                                mp->classify_table_index,
                                mp->is_resolve_host,
                                mp->is_resolve_attached, 0, 0,
                                mp->is_dvr,
                                mp->is_source_lookup,
                                mp->is_udp_encap,
                                fib_index, &pfx, DPO_PROTO_IP6,
                                &nh, ntohl (mp->next_hop_id),
                                ntohl (mp->next_hop_sw_if_index),
                                next_hop_fib_index,
                                mp->next_hop_weight,
                                mp->next_hop_preference,
                                ntohl (mp->next_hop_via_label), label_stack);

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

  return (rv);
}

void
vl_api_ip_add_del_route_t_handler (vl_api_ip_add_del_route_t * mp)
{
  vl_api_ip_add_del_route_reply_t *rmp;
  u32 stats_index;
  int rv;
  vnet_main_t *vnm = vnet_get_main ();

  vnm->api_errno = 0;
  stats_index = ~0;

  if (mp->is_ipv6)
    rv = ip6_add_del_route_t_handler (mp, &stats_index);
  else
    rv = ip4_add_del_route_t_handler (mp, &stats_index);

  rv = (rv == 0) ? vnm->api_errno : rv;

  /* *INDENT-OFF* */
  REPLY_MACRO2 (VL_API_IP_ADD_DEL_ROUTE_REPLY,
  ({
    rmp->stats_index = htonl (stats_index);
  }))
  /* *INDENT-ON* */
}

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

  /*
   * 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)
        {
          fib_table_find_or_create_and_lock_w_name (fproto, table_id,
                                                    (is_api ?
                                                     FIB_SOURCE_API :
                                                     FIB_SOURCE_CLI), name);
        }
      if (~0 == mfib_index)
        {
          mfib_table_find_or_create_and_lock_w_name (fproto, table_id,
                                                     (is_api ?
                                                      MFIB_SOURCE_API :
                                                      MFIB_SOURCE_CLI), name);
        }
    }
}

static int
add_del_mroute_check (fib_protocol_t table_proto,
                      u32 table_id,
                      u32 next_hop_sw_if_index, u8 is_local, u32 * fib_index)
{
  vnet_main_t *vnm = vnet_get_main ();

  *fib_index = mfib_table_find (table_proto, ntohl (table_id));
  if (~0 == *fib_index)
    {
      /* No such table */
      return VNET_API_ERROR_NO_SUCH_FIB;
    }

  if (~0 != ntohl (next_hop_sw_if_index))
    {
      if (pool_is_free_index (vnm->interface_main.sw_interfaces,
                              ntohl (next_hop_sw_if_index)))
        {
          return VNET_API_ERROR_NO_MATCHING_INTERFACE;
        }
    }

  return (0);
}

static fib_node_index_t
mroute_add_del_handler (u8 is_add,
                        u8 is_local,
                        u32 fib_index,
                        const mfib_prefix_t * prefix,
                        dpo_proto_t nh_proto,
                        u32 entry_flags,
                        fib_rpf_id_t rpf_id,
                        u32 next_hop_sw_if_index,
                        ip46_address_t * nh, u32 itf_flags, u32 bier_imp)
{
  fib_node_index_t mfib_entry_index = ~0;

  stats_dslock_with_hint (1 /* release hint */ , 2 /* tag */ );

  fib_route_path_t path = {
    .frp_sw_if_index = next_hop_sw_if_index,
    .frp_proto = nh_proto,
    .frp_addr = *nh,
  };

  if (is_local)
    path.frp_flags |= FIB_ROUTE_PATH_LOCAL;

  if (DPO_PROTO_BIER == nh_proto)
    {
      path.frp_bier_imp = bier_imp;
      path.frp_flags = FIB_ROUTE_PATH_BIER_IMP;
    }
  else if (!is_local && ~0 == next_hop_sw_if_index)
    {
      mfib_entry_index = mfib_table_entry_update (fib_index, prefix,
                                                  MFIB_SOURCE_API,
                                                  rpf_id, entry_flags);
      goto done;
    }

  if (is_add)
    {
      mfib_entry_index = mfib_table_entry_path_update (fib_index, prefix,
                                                       MFIB_SOURCE_API,
                                                       &path, itf_flags);
    }
  else
    {
      mfib_table_entry_path_remove (fib_index, prefix,
                                    MFIB_SOURCE_API, &path);
    }

done:
  stats_dsunlock ();
  return (mfib_entry_index);
}

static int
api_mroute_add_del_t_handler (vl_api_ip_mroute_add_del_t * mp,
                              u32 * stats_index)
{
  fib_node_index_t mfib_entry_index;
  fib_protocol_t fproto;
  dpo_proto_t nh_proto;
  ip46_address_t nh;
  u32 fib_index;
  int rv;

  nh_proto = mp->next_hop_afi;
  fproto = (mp->is_ipv6 ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
  rv = add_del_mroute_check (fproto,
                             mp->table_id,
                             mp->next_hop_sw_if_index,
                             mp->is_local, &fib_index);

  if (0 != rv)
    return (rv);

  mfib_prefix_t pfx = {
    .fp_len = ntohs (mp->grp_address_length),
    .fp_proto = fproto,
  };

  if (FIB_PROTOCOL_IP4 == fproto)
    {
      clib_memcpy (&pfx.fp_grp_addr.ip4, mp->grp_address,
                   sizeof (pfx.fp_grp_addr.ip4));
      clib_memcpy (&pfx.fp_src_addr.ip4, mp->src_address,
                   sizeof (pfx.fp_src_addr.ip4));
      memset (&nh.ip6, 0, sizeof (nh.ip6));
      clib_memcpy (&nh.ip4, mp->nh_address, sizeof (nh.ip4));
      if (!ip46_address_is_zero (&pfx.fp_src_addr))
        pfx.fp_len = 64;
    }
  else
    {
      clib_memcpy (&pfx.fp_grp_addr.ip6, mp->grp_address,
                   sizeof (pfx.fp_grp_addr.ip6));
      clib_memcpy (&pfx.fp_src_addr.ip6, mp->src_address,
                   sizeof (pfx.fp_src_addr.ip6));
      clib_memcpy (&nh.ip6, mp->nh_address, sizeof (nh.ip6));
      if (!ip46_address_is_zero (&pfx.fp_src_addr))
        pfx.fp_len = 256;
    }

  mfib_entry_index = mroute_add_del_handler (mp->is_add,
                                             mp->is_local,
                                             fib_index, &pfx,
                                             nh_proto,
                                             ntohl (mp->entry_flags),
                                             ntohl (mp->rpf_id),
                                             ntohl (mp->next_hop_sw_if_index),
                                             &nh,
                                             ntohl (mp->itf_flags),
                                             ntohl (mp->bier_imp));

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

  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;
  vnet_main_t *vnm;
  u32 stats_index;
  int rv;

  vnm = vnet_get_main ();
  vnm->api_errno = 0;
  stats_index = ~0;

  rv = api_mroute_add_del_t_handler (mp, &stats_index);

  /* *INDENT-OFF* */
  REPLY_MACRO2 (VL_API_IP_MROUTE_ADD_DEL_REPLY,
  ({
    rmp->stats_index = htonl (stats_index);
  }));
  /* *INDENT-ON* */
}

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));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (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,
                         u8 * ip, u16 prefix_length,
                         u32 sw_if_index, u8 is_ipv6, u32 context)
{
  vl_api_ip_address_details_t *mp;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_IP_ADDRESS_DETAILS);

  if (is_ipv6)
    {
      clib_memcpy (&mp->ip, ip, sizeof (mp->ip));
    }
  else
    {
      u32 *tp = (u32 *) mp->ip;
      *tp = *(u32 *) ip;
    }
  mp->prefix_length = prefix_length;
  mp->context = context;
  mp->sw_if_index = htonl (sw_if_index);
  mp->is_ipv6 = is_ipv6;

  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_address_t *r6;
  ip4_address_t *r4;
  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)
    {
      /* *INDENT-OFF* */
      /* 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,
      ({
        r6 = ip_interface_address_get_address (lm6, ia);
        u16 prefix_length = ia->address_length;
        send_ip_address_details(am, reg, (u8*)r6, prefix_length,
                                sw_if_index, 1, mp->context);
      }));
      /* *INDENT-ON* */
    }
  else
    {
      /* *INDENT-OFF* */
      foreach_ip_interface_address (lm4, ia, sw_if_index, 0,
      ({
        r4 = ip_interface_address_get_address (lm4, ia);
        u16 prefix_length = ia->address_length;
        send_ip_address_details(am, reg, (u8*)r4, prefix_length,
                                sw_if_index, 0, mp->context);
      }));
      /* *INDENT-ON* */
    }

  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));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (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
    {
      /* *INDENT-OFF* */
      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);
          }
      }));
      /* *INDENT-ON* */
    }

  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_len (sorted_sis) = 0;
  /* *INDENT-OFF* */
  pool_foreach (si, im->sw_interfaces,
  ({
    vec_add1 (sorted_sis, si[0]);
  }));
  /* *INDENT-ON* */

  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);
      }
  }
}

static void
set_ip6_flow_hash (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;
#undef _

  rv = vnet_set_ip6_flow_hash (table_id, flow_hash_config);

  REPLY_MACRO (VL_API_SET_IP_FLOW_HASH_REPLY);
}

static void
set_ip4_flow_hash (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;
#undef _

  rv = vnet_set_ip4_flow_hash (table_id, flow_hash_config);

  REPLY_MACRO (VL_API_SET_IP_FLOW_HASH_REPLY);
}


static void
vl_api_set_ip_flow_hash_t_handler (vl_api_set_ip_flow_hash_t * mp)
{
  if (mp->is_ipv6 == 0)
    set_ip4_flow_hash (mp);
  else
    set_ip6_flow_hash (mp);
}

static void
  vl_api_sw_interface_ip6nd_ra_config_t_handler
  (vl_api_sw_interface_ip6nd_ra_config_t * mp)
{
  vl_api_sw_interface_ip6nd_ra_config_reply_t *rmp;
  vlib_main_t *vm = vlib_get_main ();
  int rv = 0;
  u8 is_no, suppress, managed, other, ll_option, send_unicast, cease,
    default_router;

  is_no = mp->is_no == 1;
  suppress = mp->suppress == 1;
  managed = mp->managed == 1;
  other = mp->other == 1;
  ll_option = mp->ll_option == 1;
  send_unicast = mp->send_unicast == 1;
  cease = mp->cease == 1;
  default_router = mp->default_router == 1;

  VALIDATE_SW_IF_INDEX (mp);

  rv = ip6_neighbor_ra_config (vm, ntohl (mp->sw_if_index),
                               suppress, managed, other,
                               ll_option, send_unicast, cease,
                               default_router, ntohl (mp->lifetime),
                               ntohl (mp->initial_count),
                               ntohl (mp->initial_interval),
                               ntohl (mp->max_interval),
                               ntohl (mp->min_interval), is_no);

  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO (VL_API_SW_INTERFACE_IP6ND_RA_CONFIG_REPLY);
}

static void
  vl_api_sw_interface_ip6nd_ra_prefix_t_handler
  (vl_api_sw_interface_ip6nd_ra_prefix_t * mp)
{
  vlib_main_t *vm = vlib_get_main ();
  vl_api_sw_interface_ip6nd_ra_prefix_reply_t *rmp;
  int rv = 0;
  u8 is_no, use_default, no_advertise, off_link, no_autoconfig, no_onlink;

  VALIDATE_SW_IF_INDEX (mp);

  is_no = mp->is_no == 1;
  use_default = mp->use_default == 1;
  no_advertise = mp->no_advertise == 1;
  off_link = mp->off_link == 1;
  no_autoconfig = mp->no_autoconfig == 1;
  no_onlink = mp->no_onlink == 1;

  rv = ip6_neighbor_ra_prefix (vm, ntohl (mp->sw_if_index),
                               (ip6_address_t *) mp->address,
                               mp->address_length, use_default,
                               ntohl (mp->val_lifetime),
                               ntohl (mp->pref_lifetime), no_advertise,
                               off_link, no_autoconfig, no_onlink, is_no);

  BAD_SW_IF_INDEX_LABEL;
  REPLY_MACRO (VL_API_SW_INTERFACE_IP6ND_RA_PREFIX_REPLY);
}

static void
send_ip6nd_proxy_details (vl_api_registration_t * reg,
                          u32 context,
                          const ip46_address_t * addr, u32 sw_if_index)
{
  vl_api_ip6nd_proxy_details_t *mp;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_IP6ND_PROXY_DETAILS);
  mp->context = context;
  mp->sw_if_index = htonl (sw_if_index);
  memcpy (mp->address, addr, 16);

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

typedef struct api_ip6nd_proxy_fib_table_walk_ctx_t_
{
  u32 *indices;
} api_ip6nd_proxy_fib_table_walk_ctx_t;

static fib_table_walk_rc_t
api_ip6nd_proxy_fib_table_walk (fib_node_index_t fei, void *arg)
{
  api_ip6nd_proxy_fib_table_walk_ctx_t *ctx = arg;

  if (fib_entry_is_sourced (fei, FIB_SOURCE_IP6_ND_PROXY))
    {
      vec_add1 (ctx->indices, fei);
    }

  return (FIB_TABLE_WALK_CONTINUE);
}

static void
vl_api_ip6nd_proxy_dump_t_handler (vl_api_ip6nd_proxy_dump_t * mp)
{
  ip6_main_t *im6 = &ip6_main;
  fib_table_t *fib_table;
  api_ip6nd_proxy_fib_table_walk_ctx_t ctx = {
    .indices = NULL,
  };
  fib_node_index_t *feip;
  const fib_prefix_t *pfx;
  vl_api_registration_t *reg;

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

  /* *INDENT-OFF* */
  pool_foreach (fib_table, im6->fibs,
  ({
    fib_table_walk(fib_table->ft_index,
                   FIB_PROTOCOL_IP6,
                   api_ip6nd_proxy_fib_table_walk,
                   &ctx);
  }));
  /* *INDENT-ON* */

  vec_sort_with_function (ctx.indices, fib_entry_cmp_for_sort);

  vec_foreach (feip, ctx.indices)
  {
    pfx = fib_entry_get_prefix (*feip);

    send_ip6nd_proxy_details (reg,
                              mp->context,
                              &pfx->fp_addr,
                              fib_entry_get_resolving_interface (*feip));
  }

  vec_free (ctx.indices);
}

static void
vl_api_ip6nd_proxy_add_del_t_handler (vl_api_ip6nd_proxy_add_del_t * mp)
{
  vl_api_ip6nd_proxy_add_del_reply_t *rmp;
  int rv = 0;

  VALIDATE_SW_IF_INDEX (mp);

  rv = ip6_neighbor_proxy_add_del (ntohl (mp->sw_if_index),
                                   (ip6_address_t *) mp->address, mp->is_del);

  BAD_SW_IF_INDEX_LABEL;
  REPLY_MACRO (VL_API_IP6ND_PROXY_ADD_DEL_REPLY);
}

static void
  vl_api_ip6nd_send_router_solicitation_t_handler
  (vl_api_ip6nd_send_router_solicitation_t * mp)
{
  vl_api_ip6nd_send_router_solicitation_reply_t *rmp;
  icmp6_send_router_solicitation_params_t params;
  vlib_main_t *vm = vlib_get_main ();
  int rv = 0;

  VALIDATE_SW_IF_INDEX (mp);

  BAD_SW_IF_INDEX_LABEL;
  REPLY_MACRO (VL_API_IP6ND_SEND_ROUTER_SOLICITATION_REPLY);

  if (rv != 0)
    return;

  params.irt = ntohl (mp->irt);
  params.mrt = ntohl (mp->mrt);
  params.mrc = ntohl (mp->mrc);
  params.mrd = ntohl (mp->mrd);

  icmp6_send_router_solicitation (vm, ntohl (mp->sw_if_index), mp->stop,
                                  &params);
}

static void
  vl_api_sw_interface_ip6_enable_disable_t_handler
  (vl_api_sw_interface_ip6_enable_disable_t * mp)
{
  vlib_main_t *vm = vlib_get_main ();
  vl_api_sw_interface_ip6_enable_disable_reply_t *rmp;
  vnet_main_t *vnm = vnet_get_main ();
  int rv = 0;
  clib_error_t *error;

  vnm->api_errno = 0;

  VALIDATE_SW_IF_INDEX (mp);

  error =
    (mp->enable == 1) ? enable_ip6_interface (vm,
                                              ntohl (mp->sw_if_index)) :
    disable_ip6_interface (vm, ntohl (mp->sw_if_index));

  if (error)
    {
      clib_error_report (error);
      rv = VNET_API_ERROR_UNSPECIFIED;
    }
  else
    {
      rv = vnm->api_errno;
    }

  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO (VL_API_SW_INTERFACE_IP6_ENABLE_DISABLE_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)
{
  vlib_main_t *vm = vlib_get_main ();
  vl_api_sw_interface_ip6_set_link_local_address_reply_t *rmp;
  int rv = 0;
  clib_error_t *error;
  vnet_main_t *vnm = vnet_get_main ();

  vnm->api_errno = 0;

  VALIDATE_SW_IF_INDEX (mp);

  error = set_ip6_link_local_address (vm,
                                      ntohl (mp->sw_if_index),
                                      (ip6_address_t *) mp->address);
  if (error)
    {
      clib_error_report (error);
      rv = VNET_API_ERROR_UNSPECIFIED;
    }
  else
    {
      rv = vnm->api_errno;
    }

  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO (VL_API_SW_INTERFACE_IP6_SET_LINK_LOCAL_ADDRESS_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;
  mfib_prefix_t prefix;
  mfib_table_t *mfib;
  mfib_itf_t *mfi;

  mp = vl_msg_api_alloc (sizeof (*mp));

  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_MFIB_SIGNAL_DETAILS);
  mp->context = context;

  mfi = mfib_itf_get (mfs->mfs_itf);
  mfib_entry_get_prefix (mfs->mfs_entry, &prefix);
  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);

  if (FIB_PROTOCOL_IP4 == prefix.fp_proto)
    {
      mp->grp_address_len = ntohs (prefix.fp_len);

      memcpy (mp->grp_address, &prefix.fp_grp_addr.ip4, 4);
      if (prefix.fp_len > 32)
        {
          memcpy (mp->src_address, &prefix.fp_src_addr.ip4, 4);
        }
    }
  else
    {
      mp->grp_address_len = ntohs (prefix.fp_len);

      ASSERT (0);
    }

  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;

  memset (&args, 0, sizeof (args));
  ip_set (&args.prefix.fp_addr, mp->ip, mp->is_ip4);
  args.prefix.fp_len = mp->plen ? mp->plen : (mp->is_ip4 ? 32 : 128);
  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);
}

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_ipv6 = mp->is_ipv6;
  u8 is_add = mp->is_add;
  u8 mask_length = mp->mask_length;
  ip4_address_t ip4_addr;
  ip6_address_t ip6_addr;
  u16 *low_ports = 0;
  u16 *high_ports = 0;
  u32 vrf_id;
  u16 tmp_low, tmp_high;
  u8 num_ranges;
  int i;

  // 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);
    }

  // Validate mask_length
  if ((is_ipv6 && mask_length > 128) || (!is_ipv6 && mask_length > 32))
    {
      rv = VNET_API_ERROR_ADDRESS_LENGTH_MISMATCH;
      goto reply;
    }

  vrf_id = ntohl (mp->vrf_id);

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


  if (is_ipv6)
    {
      clib_memcpy (ip6_addr.as_u8, mp->address, sizeof (ip6_addr.as_u8));
      rv = ip6_source_and_port_range_check_add_del (&ip6_addr,
                                                    mask_length,
                                                    vrf_id,
                                                    low_ports,
                                                    high_ports, is_add);
    }
  else
    {
      clib_memcpy (ip4_addr.data, mp->address, sizeof (ip4_addr));
      rv = ip4_source_and_port_range_check_add_del (&ip4_addr,
                                                    mask_length,
                                                    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);
}

#define IP4_ARP_EVENT 3
#define IP6_ND_EVENT 4

static int arp_change_delete_callback (u32 pool_index, u8 * notused);
static int nd_change_delete_callback (u32 pool_index, u8 * notused);
static vlib_node_registration_t ip_resolver_process_node;

static void
handle_ip4_arp_event (u32 pool_index)
{
  vpe_api_main_t *vam = &vpe_api_main;
  vnet_main_t *vnm = vam->vnet_main;
  vlib_main_t *vm = vam->vlib_main;
  vl_api_ip4_arp_event_t *event;
  vl_api_ip4_arp_event_t *mp;
  vl_api_registration_t *reg;

  /* Client can cancel, die, etc. */
  if (pool_is_free_index (vam->arp_events, pool_index))
    return;

  event = pool_elt_at_index (vam->arp_events, pool_index);

  reg = vl_api_client_index_to_registration (event->client_index);
  if (!reg)
    {
      (void) vnet_add_del_ip4_arp_change_event
        (vnm, arp_change_delete_callback,
         event->pid, &event->address,
         ip_resolver_process_node.index, IP4_ARP_EVENT,
         ~0 /* pool index, notused */ , 0 /* is_add */ );
      return;
    }

  if (vl_api_can_send_msg (reg))
    {
      mp = vl_msg_api_alloc (sizeof (*mp));
      clib_memcpy (mp, event, sizeof (*mp));
      vl_api_send_msg (reg, (u8 *) mp);
    }
  else
    {
      static f64 last_time;
      /*
       * Throttle syslog msgs.
       * It's pretty tempting to just revoke the registration...
       */
      if (vlib_time_now (vm) > last_time + 10.0)
        {
          clib_warning ("arp event for %U to pid %d: queue stuffed!",
                        format_ip4_address, &event->address, event->pid);
          last_time = vlib_time_now (vm);
        }
    }
}

static void
handle_ip6_nd_event (u32 pool_index)
{
  vpe_api_main_t *vam = &vpe_api_main;
  vnet_main_t *vnm = vam->vnet_main;
  vlib_main_t *vm = vam->vlib_main;
  vl_api_ip6_nd_event_t *event;
  vl_api_ip6_nd_event_t *mp;
  vl_api_registration_t *reg;

  /* Client can cancel, die, etc. */
  if (pool_is_free_index (vam->nd_events, pool_index))
    return;

  event = pool_elt_at_index (vam->nd_events, pool_index);

  reg = vl_api_client_index_to_registration (event->client_index);
  if (!reg)
    {
      (void) vnet_add_del_ip6_nd_change_event
        (vnm, nd_change_delete_callback,
         event->pid, &event->address,
         ip_resolver_process_node.index, IP6_ND_EVENT,
         ~0 /* pool index, notused */ , 0 /* is_add */ );
      return;
    }

  if (vl_api_can_send_msg (reg))
    {
      mp = vl_msg_api_alloc (sizeof (*mp));
      clib_memcpy (mp, event, sizeof (*mp));
      vl_api_send_msg (reg, (u8 *) mp);
    }
  else
    {
      static f64 last_time;
      /*
       * Throttle syslog msgs.
       * It's pretty tempting to just revoke the registration...
       */
      if (vlib_time_now (vm) > last_time + 10.0)
        {
          clib_warning ("ip6 nd event for %U to pid %d: queue stuffed!",
                        format_ip6_address, &event->address, event->pid);
          last_time = vlib_time_now (vm);
        }
    }
}

static uword
resolver_process (vlib_main_t * vm,
                  vlib_node_runtime_t * rt, vlib_frame_t * f)
{
  volatile f64 timeout = 100.0;
  volatile uword *event_data = 0;

  while (1)
    {
      vlib_process_wait_for_event_or_clock (vm, timeout);

      uword event_type =
        vlib_process_get_events (vm, (uword **) & event_data);

      int i;
      switch (event_type)
        {
        case IP4_ARP_EVENT:
          for (i = 0; i < vec_len (event_data); i++)
            handle_ip4_arp_event (event_data[i]);
          break;

        case IP6_ND_EVENT:
          for (i = 0; i < vec_len (event_data); i++)
            handle_ip6_nd_event (event_data[i]);
          break;

        case ~0:                /* timeout */
          break;
        }

      vec_reset_length (event_data);
    }
  return 0;                     /* or not */
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ip_resolver_process_node,static) = {
  .function = resolver_process,
  .type = VLIB_NODE_TYPE_PROCESS,
  .name = "ip-route-resolver-process",
};
/* *INDENT-ON* */

static int
nd_change_data_callback (u32 pool_index, u8 * new_mac,
                         u32 sw_if_index, ip6_address_t * address)
{
  vpe_api_main_t *am = &vpe_api_main;
  vl_api_ip6_nd_event_t *event;

  if (pool_is_free_index (am->nd_events, pool_index))
    return 1;

  event = pool_elt_at_index (am->nd_events, pool_index);
  if (eth_mac_equal (event->new_mac, new_mac) &&
      sw_if_index == ntohl (event->sw_if_index))
    {
      return 1;
    }

  clib_memcpy (event->new_mac, new_mac, sizeof (event->new_mac));
  event->sw_if_index = htonl (sw_if_index);
  return 0;
}

static int
arp_change_delete_callback (u32 pool_index, u8 * notused)
{
  vpe_api_main_t *am = &vpe_api_main;

  if (pool_is_free_index (am->arp_events, pool_index))
    return 1;

  pool_put_index (am->arp_events, pool_index);
  return 0;
}

static int
nd_change_delete_callback (u32 pool_index, u8 * notused)
{
  vpe_api_main_t *am = &vpe_api_main;

  if (pool_is_free_index (am->nd_events, pool_index))
    return 1;

  pool_put_index (am->nd_events, pool_index);
  return 0;
}

static vlib_node_registration_t wc_arp_process_node;

enum
{ WC_ARP_REPORT, WC_ND_REPORT, RA_REPORT, REPORT_MAX };

static uword
wc_arp_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
{
  /* These cross the longjmp  boundry (vlib_process_wait_for_event)
   * and need to be volatile - to prevent them from being optimized into
   * a register - which could change during suspension */

  volatile wc_arp_report_t arp_prev = { 0 };
  volatile wc_nd_report_t nd_prev = { 0 };
  volatile f64 last_arp = vlib_time_now (vm);
  volatile f64 last_nd = vlib_time_now (vm);

  while (1)
    {
      vlib_process_wait_for_event (vm);
      uword event_type = WC_ARP_REPORT;
      void *event_data = vlib_process_get_event_data (vm, &event_type);

      f64 now = vlib_time_now (vm);
      int i;
      if (event_type == WC_ARP_REPORT)
        {
          wc_arp_report_t *arp_events = event_data;
          for (i = 0; i < vec_len (arp_events); i++)
            {
              /* discard dup event */
              if (arp_prev.ip4 == arp_events[i].ip4 &&
                  eth_mac_equal ((u8 *) arp_prev.mac, arp_events[i].mac) &&
                  arp_prev.sw_if_index == arp_events[i].sw_if_index &&
                  (now - last_arp) < 10.0)
                {
                  continue;
                }
              arp_prev = arp_events[i];
              last_arp = now;
              vpe_client_registration_t *reg;
            /* *INDENT-OFF* */
            pool_foreach(reg, vpe_api_main.wc_ip4_arp_events_registrations,
            ({
              vl_api_registration_t *vl_reg;
              vl_reg = vl_api_client_index_to_registration (reg->client_index);
              ASSERT (vl_reg != NULL);
              if (reg && vl_api_can_send_msg (vl_reg))
                {
                  vl_api_ip4_arp_event_t * event = vl_msg_api_alloc (sizeof *event);
                  memset (event, 0, sizeof *event);
                  event->_vl_msg_id = htons (VL_API_IP4_ARP_EVENT);
                  event->client_index = reg->client_index;
                  event->pid = reg->client_pid;
                  event->mac_ip = 1;
                  event->address = arp_events[i].ip4;
                  event->sw_if_index = htonl(arp_events[i].sw_if_index);
                  memcpy(event->new_mac, arp_events[i].mac, sizeof event->new_mac);
                  vl_api_send_msg (vl_reg, (u8 *) event);
                }
            }));
            /* *INDENT-ON* */
            }
        }
      else if (event_type == WC_ND_REPORT)
        {
          wc_nd_report_t *nd_events = event_data;
          for (i = 0; i < vec_len (nd_events); i++)
            {
              /* discard dup event */
              if (ip6_address_is_equal
                  ((ip6_address_t *) & nd_prev.ip6, &nd_events[i].ip6)
                  && eth_mac_equal ((u8 *) nd_prev.mac, nd_events[i].mac)
                  && nd_prev.sw_if_index == nd_events[i].sw_if_index
                  && (now - last_nd) < 10.0)
                {
                  continue;
                }
              nd_prev = nd_events[i];
              last_nd = now;
              vpe_client_registration_t *reg;
              /* *INDENT-OFF* */
              pool_foreach(reg, vpe_api_main.wc_ip6_nd_events_registrations,
              ({
                vl_api_registration_t *vl_reg;
                vl_reg = vl_api_client_index_to_registration (reg->client_index);
                if (vl_reg && vl_api_can_send_msg (vl_reg))
                  {
                    vl_api_ip6_nd_event_t * event = vl_msg_api_alloc (sizeof *event);
                    memset (event, 0, sizeof *event);
                    event->_vl_msg_id = htons (VL_API_IP6_ND_EVENT);
                    event->client_index = reg->client_index;
                    event->pid = reg->client_pid;
                    event->mac_ip = 1;
                    memcpy(event->address, nd_events[i].ip6.as_u8, sizeof event->address);
                    event->sw_if_index = htonl(nd_events[i].sw_if_index);
                    memcpy(event->new_mac, nd_events[i].mac, sizeof event->new_mac);
                    vl_api_send_msg (vl_reg, (u8 *) event);
                  }
              }));
            /* *INDENT-ON* */
            }
        }
      else if (event_type == RA_REPORT)
        {
          ra_report_t *ra_events = event_data;
          for (i = 0; i < vec_len (ra_events); i++)
            {
              ip6_neighbor_public_main_t *npm = &ip6_neighbor_public_main;
              call_ip6_neighbor_callbacks (&ra_events[i],
                                           npm->ra_report_functions);

              vpe_client_registration_t *reg;
              /* *INDENT-OFF* */
              pool_foreach(reg, vpe_api_main.ip6_ra_events_registrations,
              ({
                vl_api_registration_t *vl_reg;
                vl_reg =
                  vl_api_client_index_to_registration (reg->client_index);
                if (vl_reg && vl_api_can_send_msg (vl_reg))
                  {
                    u32 event_size =
                      sizeof (vl_api_ip6_ra_event_t) +
                      vec_len (ra_events[i].prefixes) *
                      sizeof (vl_api_ip6_ra_prefix_info_t);
                    vl_api_ip6_ra_event_t *event =
                      vl_msg_api_alloc (event_size);
                    memset (event, 0, event_size);
                    event->_vl_msg_id = htons (VL_API_IP6_RA_EVENT);
                    event->client_index = reg->client_index;
                    event->pid = reg->client_pid;

                    event->sw_if_index = clib_host_to_net_u32 (ra_events[i].sw_if_index);

                    memcpy (event->router_address, ra_events[i].router_address, 16);

                    event->current_hop_limit = ra_events[i].current_hop_limit;
                    event->flags = ra_events[i].flags;
                    event->router_lifetime_in_sec =
                      clib_host_to_net_u16 (ra_events
                                            [i].router_lifetime_in_sec);
                    event->neighbor_reachable_time_in_msec =
                      clib_host_to_net_u32 (ra_events
                                            [i].neighbor_reachable_time_in_msec);
                    event->time_in_msec_between_retransmitted_neighbor_solicitations
                      =
                      clib_host_to_net_u32 (ra_events
                                            [i].time_in_msec_between_retransmitted_neighbor_solicitations);

                    event->n_prefixes =
                      clib_host_to_net_u32 (vec_len (ra_events[i].prefixes));
                    vl_api_ip6_ra_prefix_info_t *prefix =
                      (typeof (prefix)) event->prefixes;
                    u32 j;
                    for (j = 0; j < vec_len (ra_events[i].prefixes); j++)
                      {
                        ra_report_prefix_info_t *info =
                          &ra_events[i].prefixes[j];
                        memcpy (prefix->dst_address, info->dst_address.as_u8,
                                16);
                        prefix->dst_address_length = info->dst_address_length;
                        prefix->flags = info->flags;
                        prefix->valid_time =
                          clib_host_to_net_u32 (info->valid_time);
                        prefix->preferred_time =
                          clib_host_to_net_u32 (info->preferred_time);
                        prefix++;
                      }

                    vl_api_send_msg (vl_reg, (u8 *) event);
                  }
              }));
              /* *INDENT-ON* */
              vec_free (ra_events[i].prefixes);
            }
        }
      vlib_process_put_event_data (vm, event_data);
    }

  return 0;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (wc_arp_process_node,static) = {
  .function = wc_arp_process,
  .type = VLIB_NODE_TYPE_PROCESS,
  .name = "wildcard-ip4-arp-publisher-process",
};
/* *INDENT-ON* */

static int
arp_change_data_callback (u32 pool_index, u8 * new_mac,
                          u32 sw_if_index, u32 address)
{
  vpe_api_main_t *am = &vpe_api_main;
  vl_api_ip4_arp_event_t *event;

  if (pool_is_free_index (am->arp_events, pool_index))
    return 1;

  event = pool_elt_at_index (am->arp_events, pool_index);
  if (eth_mac_equal (event->new_mac, new_mac) &&
      sw_if_index == ntohl (event->sw_if_index))
    {
      return 1;
    }

  clib_memcpy (event->new_mac, new_mac, sizeof (event->new_mac));
  event->sw_if_index = htonl (sw_if_index);
  return 0;
}

static void
vl_api_want_ip4_arp_events_t_handler (vl_api_want_ip4_arp_events_t * mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  vnet_main_t *vnm = vnet_get_main ();
  vl_api_want_ip4_arp_events_reply_t *rmp;
  int rv = 0;

  if (mp->address == 0)
    {
      uword *p =
        hash_get (am->wc_ip4_arp_events_registration_hash, mp->client_index);
      vpe_client_registration_t *rp;
      if (p)
        {
          if (mp->enable_disable)
            {
              clib_warning ("pid %d: already enabled...", mp->pid);
              rv = VNET_API_ERROR_INVALID_REGISTRATION;
              goto reply;
            }
          else
            {
              rp =
                pool_elt_at_index (am->wc_ip4_arp_events_registrations, p[0]);
              pool_put (am->wc_ip4_arp_events_registrations, rp);
              hash_unset (am->wc_ip4_arp_events_registration_hash,
                          mp->client_index);
              if (pool_elts (am->wc_ip4_arp_events_registrations) == 0)
                wc_arp_set_publisher_node (~0, REPORT_MAX);
              goto reply;
            }
        }
      if (mp->enable_disable == 0)
        {
          clib_warning ("pid %d: already disabled...", mp->pid);
          rv = VNET_API_ERROR_INVALID_REGISTRATION;
          goto reply;
        }
      pool_get (am->wc_ip4_arp_events_registrations, rp);
      rp->client_index = mp->client_index;
      rp->client_pid = mp->pid;
      hash_set (am->wc_ip4_arp_events_registration_hash, rp->client_index,
                rp - am->wc_ip4_arp_events_registrations);
      wc_arp_set_publisher_node (wc_arp_process_node.index, WC_ARP_REPORT);
      goto reply;
    }

  if (mp->enable_disable)
    {
      vl_api_ip4_arp_event_t *event;
      pool_get (am->arp_events, event);
      rv = vnet_add_del_ip4_arp_change_event
        (vnm, arp_change_data_callback,
         mp->pid, &mp->address /* addr, in net byte order */ ,
         ip_resolver_process_node.index,
         IP4_ARP_EVENT, event - am->arp_events, 1 /* is_add */ );

      if (rv)
        {
          pool_put (am->arp_events, event);
          goto reply;
        }
      memset (event, 0, sizeof (*event));

      /* Python API expects events to have no context */
      event->_vl_msg_id = htons (VL_API_IP4_ARP_EVENT);
      event->client_index = mp->client_index;
      event->address = mp->address;
      event->pid = mp->pid;
      if (mp->address == 0)
        event->mac_ip = 1;
    }
  else
    {
      rv = vnet_add_del_ip4_arp_change_event
        (vnm, arp_change_delete_callback,
         mp->pid, &mp->address /* addr, in net byte order */ ,
         ip_resolver_process_node.index,
         IP4_ARP_EVENT, ~0 /* pool index */ , 0 /* is_add */ );
    }
reply:
  REPLY_MACRO (VL_API_WANT_IP4_ARP_EVENTS_REPLY);
}

static clib_error_t *
want_ip4_arp_events_reaper (u32 client_index)
{
  vpe_client_registration_t *rp;
  vl_api_ip4_arp_event_t *event;
  u32 *to_delete, *event_id;
  vpe_api_main_t *am;
  vnet_main_t *vnm;
  uword *p;

  am = &vpe_api_main;
  vnm = vnet_get_main ();
  to_delete = NULL;

  /* clear out all of its pending resolutions */
  /* *INDENT-OFF* */
  pool_foreach(event, am->arp_events,
  ({
    if (event->client_index == client_index)
      {
        vec_add1(to_delete, event - am->arp_events);
      }
  }));
  /* *INDENT-ON* */

  vec_foreach (event_id, to_delete)
  {
    event = pool_elt_at_index (am->arp_events, *event_id);
    vnet_add_del_ip4_arp_change_event
      (vnm, arp_change_delete_callback,
       event->pid, &event->address,
       ip_resolver_process_node.index, IP4_ARP_EVENT,
       ~0 /* pool index, notused */ , 0 /* is_add */ );
  }
  vec_free (to_delete);

  /* remove from the registration hash */
  p = hash_get (am->wc_ip4_arp_events_registration_hash, client_index);

  if (p)
    {
      rp = pool_elt_at_index (am->wc_ip4_arp_events_registrations, p[0]);
      pool_put (am->wc_ip4_arp_events_registrations, rp);
      hash_unset (am->wc_ip4_arp_events_registration_hash, client_index);
      if (pool_elts (am->wc_ip4_arp_events_registrations) == 0)
        wc_arp_set_publisher_node (~0, REPORT_MAX);
    }
  return (NULL);
}

VL_MSG_API_REAPER_FUNCTION (want_ip4_arp_events_reaper);

static void
vl_api_want_ip6_nd_events_t_handler (vl_api_want_ip6_nd_events_t * mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  vnet_main_t *vnm = vnet_get_main ();
  vl_api_want_ip6_nd_events_reply_t *rmp;
  int rv = 0;

  if (ip6_address_is_zero ((ip6_address_t *) mp->address))
    {
      uword *p =
        hash_get (am->wc_ip6_nd_events_registration_hash, mp->client_index);
      vpe_client_registration_t *rp;
      if (p)
        {
          if (mp->enable_disable)
            {
              clib_warning ("pid %d: already enabled...", mp->pid);
              rv = VNET_API_ERROR_INVALID_REGISTRATION;
              goto reply;
            }
          else
            {
              rp =
                pool_elt_at_index (am->wc_ip6_nd_events_registrations, p[0]);
              pool_put (am->wc_ip6_nd_events_registrations, rp);
              hash_unset (am->wc_ip6_nd_events_registration_hash,
                          mp->client_index);
              if (pool_elts (am->wc_ip6_nd_events_registrations) == 0)
                wc_nd_set_publisher_node (~0, REPORT_MAX);
              goto reply;
            }
        }
      if (mp->enable_disable == 0)
        {
          clib_warning ("pid %d: already disabled...", mp->pid);
          rv = VNET_API_ERROR_INVALID_REGISTRATION;
          goto reply;
        }
      pool_get (am->wc_ip6_nd_events_registrations, rp);
      rp->client_index = mp->client_index;
      rp->client_pid = mp->pid;
      hash_set (am->wc_ip6_nd_events_registration_hash, rp->client_index,
                rp - am->wc_ip6_nd_events_registrations);
      wc_nd_set_publisher_node (wc_arp_process_node.index, WC_ND_REPORT);
      goto reply;
    }

  if (mp->enable_disable)
    {
      vl_api_ip6_nd_event_t *event;
      pool_get (am->nd_events, event);

      rv = vnet_add_del_ip6_nd_change_event
        (vnm, nd_change_data_callback,
         mp->pid, mp->address /* addr, in net byte order */ ,
         ip_resolver_process_node.index,
         IP6_ND_EVENT, event - am->nd_events, 1 /* is_add */ );

      if (rv)
        {
          pool_put (am->nd_events, event);
          goto reply;
        }
      memset (event, 0, sizeof (*event));

      event->_vl_msg_id = ntohs (VL_API_IP6_ND_EVENT);
      event->client_index = mp->client_index;
      clib_memcpy (event->address, mp->address, sizeof event->address);
      event->pid = mp->pid;
    }
  else
    {
      rv = vnet_add_del_ip6_nd_change_event
        (vnm, nd_change_delete_callback,
         mp->pid, mp->address /* addr, in net byte order */ ,
         ip_resolver_process_node.index,
         IP6_ND_EVENT, ~0 /* pool index */ , 0 /* is_add */ );
    }
reply:
  REPLY_MACRO (VL_API_WANT_IP6_ND_EVENTS_REPLY);
}

static clib_error_t *
want_ip6_nd_events_reaper (u32 client_index)
{

  vpe_client_registration_t *rp;
  vl_api_ip6_nd_event_t *event;
  u32 *to_delete, *event_id;
  vpe_api_main_t *am;
  vnet_main_t *vnm;
  uword *p;

  am = &vpe_api_main;
  vnm = vnet_get_main ();
  to_delete = NULL;

  /* clear out all of its pending resolutions */
  /* *INDENT-OFF* */
  pool_foreach(event, am->nd_events,
  ({
    if (event->client_index == client_index)
      {
        vec_add1(to_delete, event - am->nd_events);
      }
  }));
  /* *INDENT-ON* */

  vec_foreach (event_id, to_delete)
  {
    event = pool_elt_at_index (am->nd_events, *event_id);
    vnet_add_del_ip6_nd_change_event
      (vnm, nd_change_delete_callback,
       event->pid, &event->address,
       ip_resolver_process_node.index, IP6_ND_EVENT,
       ~0 /* pool index, notused */ , 0 /* is_add */ );
  }
  vec_free (to_delete);

  /* remove from the registration hash */
  p = hash_get (am->wc_ip6_nd_events_registration_hash, client_index);

  if (p)
    {
      rp = pool_elt_at_index (am->wc_ip6_nd_events_registrations, p[0]);
      pool_put (am->wc_ip6_nd_events_registrations, rp);
      hash_unset (am->wc_ip6_nd_events_registration_hash, client_index);
      if (pool_elts (am->wc_ip6_nd_events_registrations) == 0)
        wc_nd_set_publisher_node (~0, REPORT_MAX);
    }
  return (NULL);
}

VL_MSG_API_REAPER_FUNCTION (want_ip6_nd_events_reaper);

static void
vl_api_want_ip6_ra_events_t_handler (vl_api_want_ip6_ra_events_t * mp)
{
  vpe_api_main_t *am = &vpe_api_main;
  vl_api_want_ip6_ra_events_reply_t *rmp;
  int rv = 0;

  uword *p = hash_get (am->ip6_ra_events_registration_hash, mp->client_index);
  vpe_client_registration_t *rp;
  if (p)
    {
      if (mp->enable_disable)
        {
          clib_warning ("pid %d: already enabled...", ntohl (mp->pid));
          rv = VNET_API_ERROR_INVALID_REGISTRATION;
          goto reply;
        }
      else
        {
          rp = pool_elt_at_index (am->ip6_ra_events_registrations, p[0]);
          pool_put (am->ip6_ra_events_registrations, rp);
          hash_unset (am->ip6_ra_events_registration_hash, mp->client_index);
          goto reply;
        }
    }
  if (mp->enable_disable == 0)
    {
      clib_warning ("pid %d: already disabled...", ntohl (mp->pid));
      rv = VNET_API_ERROR_INVALID_REGISTRATION;
      goto reply;
    }
  pool_get (am->ip6_ra_events_registrations, rp);
  rp->client_index = mp->client_index;
  rp->client_pid = ntohl (mp->pid);
  hash_set (am->ip6_ra_events_registration_hash, rp->client_index,
            rp - am->ip6_ra_events_registrations);

reply:
  REPLY_MACRO (VL_API_WANT_IP6_RA_EVENTS_REPLY);
}

static clib_error_t *
want_ip6_ra_events_reaper (u32 client_index)
{
  vpe_api_main_t *am = &vpe_api_main;
  vpe_client_registration_t *rp;
  uword *p;

  p = hash_get (am->ip6_ra_events_registration_hash, client_index);

  if (p)
    {
      rp = pool_elt_at_index (am->ip6_ra_events_registrations, p[0]);
      pool_put (am->ip6_ra_events_registrations, rp);
      hash_unset (am->ip6_ra_events_registration_hash, client_index);
    }
  return (NULL);
}

VL_MSG_API_REAPER_FUNCTION (want_ip6_ra_events_reaper);

static void
vl_api_proxy_arp_add_del_t_handler (vl_api_proxy_arp_add_del_t * mp)
{
  vl_api_proxy_arp_add_del_reply_t *rmp;
  u32 fib_index;
  int rv;
  ip4_main_t *im = &ip4_main;
  uword *p;

  stats_dslock_with_hint (1 /* release hint */ , 6 /* tag */ );

  p = hash_get (im->fib_index_by_table_id, ntohl (mp->proxy.vrf_id));

  if (!p)
    {
      rv = VNET_API_ERROR_NO_SUCH_FIB;
      goto out;
    }

  fib_index = p[0];

  rv = vnet_proxy_arp_add_del ((ip4_address_t *) mp->proxy.low_address,
                               (ip4_address_t *) mp->proxy.hi_address,
                               fib_index, mp->is_add == 0);

out:
  stats_dsunlock ();
  REPLY_MACRO (VL_API_PROXY_ARP_ADD_DEL_REPLY);
}

typedef struct proxy_arp_walk_ctx_t_
{
  vl_api_registration_t *reg;
  u32 context;
} proxy_arp_walk_ctx_t;

static walk_rc_t
send_proxy_arp_details (const ip4_address_t * lo_addr,
                        const ip4_address_t * hi_addr,
                        u32 fib_index, void *data)
{
  vl_api_proxy_arp_details_t *mp;
  proxy_arp_walk_ctx_t *ctx;

  ctx = data;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_PROXY_ARP_DETAILS);
  mp->context = ctx->context;
  mp->proxy.vrf_id = htonl (fib_index);
  clib_memcpy (mp->proxy.low_address, lo_addr,
               sizeof (mp->proxy.low_address));
  clib_memcpy (mp->proxy.hi_address, hi_addr, sizeof (mp->proxy.hi_address));

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

  return (WALK_CONTINUE);
}

static void
vl_api_proxy_arp_dump_t_handler (vl_api_proxy_arp_dump_t * mp)
{
  vl_api_registration_t *reg;

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

  proxy_arp_walk_ctx_t wctx = {
    .reg = reg,
    .context = mp->context,
  };

  proxy_arp_walk (send_proxy_arp_details, &wctx);
}

static walk_rc_t
send_proxy_arp_intfc_details (vnet_main_t * vnm,
                              vnet_sw_interface_t * si, void *data)
{
  vl_api_proxy_arp_intfc_details_t *mp;
  proxy_arp_walk_ctx_t *ctx;

  if (!(si->flags & VNET_SW_INTERFACE_FLAG_PROXY_ARP))
    return (WALK_CONTINUE);

  ctx = data;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = ntohs (VL_API_PROXY_ARP_INTFC_DETAILS);
  mp->context = ctx->context;
  mp->sw_if_index = htonl (si->sw_if_index);

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

  return (WALK_CONTINUE);
}

static void
vl_api_proxy_arp_intfc_dump_t_handler (vl_api_proxy_arp_intfc_dump_t * mp)
{
  vl_api_registration_t *reg;

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

  proxy_arp_walk_ctx_t wctx = {
    .reg = reg,
    .context = mp->context,
  };

  vnet_sw_interface_walk (vnet_get_main (),
                          send_proxy_arp_intfc_details, &wctx);
}

static void
  vl_api_proxy_arp_intfc_enable_disable_t_handler
  (vl_api_proxy_arp_intfc_enable_disable_t * mp)
{
  int rv = 0;
  vnet_main_t *vnm = vnet_get_main ();
  vl_api_proxy_arp_intfc_enable_disable_reply_t *rmp;

  VALIDATE_SW_IF_INDEX (mp);

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

  ASSERT (si);

  if (mp->enable_disable)
    si->flags |= VNET_SW_INTERFACE_FLAG_PROXY_ARP;
  else
    si->flags &= ~VNET_SW_INTERFACE_FLAG_PROXY_ARP;

  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO (VL_API_PROXY_ARP_INTFC_ENABLE_DISABLE_REPLY);
}

static void
vl_api_ip_probe_neighbor_t_handler (vl_api_ip_probe_neighbor_t * mp)
{
  int rv = 0;
  vlib_main_t *vm = vlib_get_main ();
  vl_api_ip_probe_neighbor_reply_t *rmp;
  clib_error_t *error;

  VALIDATE_SW_IF_INDEX (mp);

  u32 sw_if_index = ntohl (mp->sw_if_index);

  if (mp->is_ipv6)
    error = ip6_probe_neighbor (vm, (ip6_address_t *) mp->dst_address,
                                sw_if_index, 0);
  else
    error = ip4_probe_neighbor (vm, (ip4_address_t *) mp->dst_address,
                                sw_if_index, 0);

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

  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO (VL_API_PROXY_ARP_INTFC_ENABLE_DISABLE_REPLY);
}

static void
  vl_api_ip_scan_neighbor_enable_disable_t_handler
  (vl_api_ip_scan_neighbor_enable_disable_t * mp)
{
  int rv = 0;
  vl_api_ip_scan_neighbor_enable_disable_reply_t *rmp;
  ip_neighbor_scan_arg_t arg;

  arg.mode = mp->mode;
  arg.scan_interval = mp->scan_interval;
  arg.max_proc_time = mp->max_proc_time;
  arg.max_update = mp->max_update;
  arg.scan_int_delay = mp->scan_int_delay;
  arg.stale_threshold = mp->stale_threshold;
  ip_neighbor_scan_enable_disable (&arg);

  REPLY_MACRO (VL_API_IP_SCAN_NEIGHBOR_ENABLE_DISABLE_REPLY);
}

static int
ip4_reset_fib_t_handler (vl_api_reset_fib_t * mp)
{
  vnet_main_t *vnm = vnet_get_main ();
  vnet_interface_main_t *im = &vnm->interface_main;
  ip4_main_t *im4 = &ip4_main;
  static u32 *sw_if_indices_to_shut;
  fib_table_t *fib_table;
  ip4_fib_t *fib;
  u32 sw_if_index;
  int i;
  int rv = VNET_API_ERROR_NO_SUCH_FIB;
  u32 target_fib_id = ntohl (mp->vrf_id);

  stats_dslock_with_hint (1 /* release hint */ , 8 /* tag */ );

  /* *INDENT-OFF* */
  pool_foreach (fib_table, im4->fibs,
  ({
    vnet_sw_interface_t * si;

    fib = pool_elt_at_index (im4->v4_fibs, fib_table->ft_index);

    if (fib->table_id != target_fib_id)
      continue;

    /* remove any mpls encap/decap labels */
    mpls_fib_reset_labels (fib->table_id);

    /* remove any proxy arps in this fib */
    vnet_proxy_arp_fib_reset (fib->table_id);

    /* Set the flow hash for this fib to the default */
    vnet_set_ip4_flow_hash (fib->table_id, IP_FLOW_HASH_DEFAULT);

    vec_reset_length (sw_if_indices_to_shut);

    /* Shut down interfaces in this FIB / clean out intfc routes */
    pool_foreach (si, im->sw_interfaces,
    ({
      u32 sw_if_index = si->sw_if_index;

      if (sw_if_index < vec_len (im4->fib_index_by_sw_if_index)
          && (im4->fib_index_by_sw_if_index[si->sw_if_index] ==
              fib->index))
        vec_add1 (sw_if_indices_to_shut, si->sw_if_index);
    }));

    for (i = 0; i < vec_len (sw_if_indices_to_shut); i++) {
      sw_if_index = sw_if_indices_to_shut[i];

      u32 flags = vnet_sw_interface_get_flags (vnm, sw_if_index);
      flags &= ~(VNET_SW_INTERFACE_FLAG_ADMIN_UP);
      vnet_sw_interface_set_flags (vnm, sw_if_index, flags);
    }

    fib_table_flush(fib->index, FIB_PROTOCOL_IP4, FIB_SOURCE_API);

    rv = 0;
    break;
    })); /* pool_foreach (fib) */
    /* *INDENT-ON* */

  stats_dsunlock ();
  return rv;
}

static int
ip6_reset_fib_t_handler (vl_api_reset_fib_t * mp)
{
  vnet_main_t *vnm = vnet_get_main ();
  vnet_interface_main_t *im = &vnm->interface_main;
  ip6_main_t *im6 = &ip6_main;
  static u32 *sw_if_indices_to_shut;
  fib_table_t *fib_table;
  ip6_fib_t *fib;
  u32 sw_if_index;
  int i;
  int rv = VNET_API_ERROR_NO_SUCH_FIB;
  u32 target_fib_id = ntohl (mp->vrf_id);

  stats_dslock_with_hint (1 /* release hint */ , 9 /* tag */ );

  /* *INDENT-OFF* */
  pool_foreach (fib_table, im6->fibs,
  ({
    vnet_sw_interface_t * si;

    fib = pool_elt_at_index (im6->v6_fibs, fib_table->ft_index);

    if (fib->table_id != target_fib_id)
      continue;

    vec_reset_length (sw_if_indices_to_shut);

    /* Set the flow hash for this fib to the default */
    vnet_set_ip6_flow_hash (fib->table_id, IP_FLOW_HASH_DEFAULT);

    /* Shut down interfaces in this FIB / clean out intfc routes */
    pool_foreach (si, im->sw_interfaces,
    ({
      if (im6->fib_index_by_sw_if_index[si->sw_if_index] ==
          fib->index)
        vec_add1 (sw_if_indices_to_shut, si->sw_if_index);
    }));

    for (i = 0; i < vec_len (sw_if_indices_to_shut); i++) {
      sw_if_index = sw_if_indices_to_shut[i];

      u32 flags = vnet_sw_interface_get_flags (vnm, sw_if_index);
      flags &= ~(VNET_SW_INTERFACE_FLAG_ADMIN_UP);
      vnet_sw_interface_set_flags (vnm, sw_if_index, flags);
    }

    fib_table_flush(fib->index, FIB_PROTOCOL_IP6, FIB_SOURCE_API);

    rv = 0;
    break;
  })); /* pool_foreach (fib) */
  /* *INDENT-ON* */

  stats_dsunlock ();
  return rv;
}

static void
vl_api_reset_fib_t_handler (vl_api_reset_fib_t * mp)
{
  int rv;
  vl_api_reset_fib_reply_t *rmp;

  if (mp->is_ipv6)
    rv = ip6_reset_fib_t_handler (mp);
  else
    rv = ip4_reset_fib_t_handler (mp);

  REPLY_MACRO (VL_API_RESET_FIB_REPLY);
}

static void
vl_api_set_arp_neighbor_limit_t_handler (vl_api_set_arp_neighbor_limit_t * mp)
{
  int rv;
  vl_api_set_arp_neighbor_limit_reply_t *rmp;
  vnet_main_t *vnm = vnet_get_main ();
  clib_error_t *error;

  vnm->api_errno = 0;

  if (mp->is_ipv6)
    error = ip6_set_neighbor_limit (ntohl (mp->arp_neighbor_limit));
  else
    error = ip4_set_arp_limit (ntohl (mp->arp_neighbor_limit));

  if (error)
    {
      clib_error_report (error);
      rv = VNET_API_ERROR_UNSPECIFIED;
    }
  else
    {
      rv = vnm->api_errno;
    }

  REPLY_MACRO (VL_API_SET_ARP_NEIGHBOR_LIMIT_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;
  if (mp->is_ip6)
    {
      rv = ip6_reass_set (clib_net_to_host_u32 (mp->timeout_ms),
                          clib_net_to_host_u32 (mp->max_reassemblies),
                          clib_net_to_host_u32 (mp->expire_walk_interval_ms));
    }
  else
    {
      rv = ip4_reass_set (clib_net_to_host_u32 (mp->timeout_ms),
                          clib_net_to_host_u32 (mp->max_reassemblies),
                          clib_net_to_host_u32 (mp->expire_walk_interval_ms));
    }

  REPLY_MACRO (VL_API_IP_REASSEMBLY_SET_REPLY);
}

void
vl_api_ip_reassembly_get_t_handler (vl_api_ip_reassembly_get_t * mp)
{
  unix_shared_memory_queue_t *q;

  q = vl_api_client_index_to_input_queue (mp->client_index);

  if (q == 0)
    return;

  vl_api_ip_reassembly_get_reply_t *rmp = vl_msg_api_alloc (sizeof (*rmp));
  memset (rmp, 0, sizeof (*rmp));
  rmp->_vl_msg_id = ntohs (VL_API_IP_REASSEMBLY_GET_REPLY);
  rmp->context = mp->context;
  rmp->retval = 0;
  if (mp->is_ip6)
    {
      rmp->is_ip6 = 1;
      ip6_reass_get (&rmp->timeout_ms, &rmp->max_reassemblies,
                     &rmp->expire_walk_interval_ms);
    }
  else
    {
      rmp->is_ip6 = 0;
      ip4_reass_get (&rmp->timeout_ms, &rmp->max_reassemblies,
                     &rmp->expire_walk_interval_ms);
    }
  rmp->timeout_ms = clib_host_to_net_u32 (rmp->timeout_ms);
  rmp->max_reassemblies = clib_host_to_net_u32 (rmp->max_reassemblies);
  rmp->expire_walk_interval_ms =
    clib_host_to_net_u32 (rmp->expire_walk_interval_ms);
  vl_msg_api_send_shmem (q, (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;
  rv = ip4_reass_enable_disable (clib_net_to_host_u32 (mp->sw_if_index),
                                 mp->enable_ip4);
  if (0 == rv)
    {
      rv = ip6_reass_enable_disable (clib_net_to_host_u32 (mp->sw_if_index),
                                     mp->enable_ip6);
    }

  REPLY_MACRO (VL_API_IP_REASSEMBLY_SET_REPLY);
}

#define vl_msg_name_crc_list
#include <vnet/ip/ip.api.h>
#undef vl_msg_name_crc_list

static void
setup_message_id_table (api_main_t * am)
{
#define _(id,n,crc) vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id);
  foreach_vl_msg_name_crc_ip;
#undef _
}

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

#define _(N,n)                                                  \
    vl_msg_api_set_handlers(VL_API_##N, #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_ip_api_msg;
#undef _

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

  ra_set_publisher_node (wc_arp_process_node.index, RA_REPORT);

  return 0;
}

VLIB_API_INIT_FUNCTION (ip_api_hookup);

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