/*
 *------------------------------------------------------------------
 * map_api.c - vnet map 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/ip/ip_types_api.h>
#include <map/map.h>
#include <map/map.api_enum.h>
#include <map/map.api_types.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/reass/ip4_sv_reass.h>
#include <vnet/ip/reass/ip6_sv_reass.h>
#include <vnet/ip/reass/ip6_full_reass.h>
#include <vnet/fib/fib_table.h>
#include <vlibmemory/api.h>

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

static void
vl_api_map_add_domain_t_handler (vl_api_map_add_domain_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_add_domain_reply_t *rmp;
  int rv = 0;
  u32 index;
  u8 flags = 0;

  mp->tag[ARRAY_LEN (mp->tag) - 1] = '\0';
  rv =
    map_create_domain ((ip4_address_t *) & mp->ip4_prefix.address,
		       mp->ip4_prefix.len,
		       (ip6_address_t *) & mp->ip6_prefix.address,
		       mp->ip6_prefix.len,
		       (ip6_address_t *) & mp->ip6_src.address,
		       mp->ip6_src.len, mp->ea_bits_len, mp->psid_offset,
		       mp->psid_length, &index, mp->mtu, flags, mp->tag);

  REPLY_MACRO2_END(VL_API_MAP_ADD_DOMAIN_REPLY,
  ({
    rmp->index = index;
  }));

}

static void
vl_api_map_del_domain_t_handler (vl_api_map_del_domain_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_del_domain_reply_t *rmp;
  int rv = 0;

  rv = map_delete_domain (ntohl (mp->index));

  REPLY_MACRO (VL_API_MAP_DEL_DOMAIN_REPLY);
}

static void
vl_api_map_add_del_rule_t_handler (vl_api_map_add_del_rule_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_del_domain_reply_t *rmp;
  int rv = 0;

  rv =
    map_add_del_psid (ntohl (mp->index), ntohs (mp->psid),
		      (ip6_address_t *) & mp->ip6_dst, mp->is_add);

  REPLY_MACRO (VL_API_MAP_ADD_DEL_RULE_REPLY);
}

static void
send_domain_details (u32 map_domain_index, vl_api_registration_t * rp,
		     u32 context)
{
  map_main_t *mm = &map_main;
  vl_api_map_domain_details_t *rmp;
  map_domain_t *d = pool_elt_at_index (mm->domains, map_domain_index);

  /* Make sure every field is initiated (or don't skip the clib_memset()) */
  map_domain_extra_t *de =
    vec_elt_at_index (mm->domain_extras, map_domain_index);
  int tag_len = clib_min (ARRAY_LEN (rmp->tag), vec_len (de->tag) + 1);

  REPLY_MACRO_DETAILS4(VL_API_MAP_DOMAIN_DETAILS, rp, context,
  ({
    rmp->domain_index = htonl (map_domain_index);
    clib_memcpy (&rmp->ip6_prefix.address, &d->ip6_prefix,
		 sizeof (rmp->ip6_prefix.address));
    clib_memcpy (&rmp->ip4_prefix.address, &d->ip4_prefix,
		 sizeof (rmp->ip4_prefix.address));
    clib_memcpy (&rmp->ip6_src.address, &d->ip6_src,
		 sizeof (rmp->ip6_src.address));
    rmp->ip6_prefix.len = d->ip6_prefix_len;
    rmp->ip4_prefix.len = d->ip4_prefix_len;
    rmp->ip6_src.len = d->ip6_src_len;
    rmp->ea_bits_len = d->ea_bits_len;
    rmp->psid_offset = d->psid_offset;
    rmp->psid_length = d->psid_length;
    rmp->flags = d->flags;
    rmp->mtu = htons (d->mtu);
    memcpy (rmp->tag, de->tag, tag_len - 1);
    rmp->tag[tag_len - 1] = '\0';
  }));
}

static void
vl_api_map_domain_dump_t_handler (vl_api_map_domain_dump_t * mp)
{
  map_main_t *mm = &map_main;
  int i;
  vl_api_registration_t *reg;

  if (pool_elts (mm->domains) == 0)
    return;

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

  pool_foreach_index (i, mm->domains)
   {
    send_domain_details(i, reg, mp->context);
  }
}

static void
vl_api_map_domains_get_t_handler (vl_api_map_domains_get_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_domains_get_reply_t *rmp;

  i32 rv = 0;

  REPLY_AND_DETAILS_MACRO (VL_API_MAP_DOMAINS_GET_REPLY, mm->domains,
  ({
    send_domain_details (cursor, rp, mp->context);
  }));
}

static void
vl_api_map_rule_dump_t_handler (vl_api_map_rule_dump_t * mp)
{
  vl_api_registration_t *reg;
  u16 i;
  ip6_address_t dst;
  vl_api_map_rule_details_t *rmp;
  map_main_t *mm = &map_main;
  u32 domain_index = ntohl (mp->domain_index);
  map_domain_t *d;

  if (pool_elts (mm->domains) == 0)
    return;

  d = pool_elt_at_index (mm->domains, domain_index);
  if (!d || !d->rules)
    {
      return;
    }

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

  for (i = 0; i < (0x1 << d->psid_length); i++)
    {
      dst = d->rules[i];
      if (dst.as_u64[0] == 0 && dst.as_u64[1] == 0)
	{
	  continue;
	}
      rmp = vl_msg_api_alloc (sizeof (*rmp));
      clib_memset (rmp, 0, sizeof (*rmp));
      rmp->_vl_msg_id = ntohs (VL_API_MAP_RULE_DETAILS + mm->msg_id_base);
      rmp->psid = htons (i);
      clib_memcpy (&rmp->ip6_dst, &dst, sizeof (rmp->ip6_dst));
      rmp->context = mp->context;
      vl_api_send_msg (reg, (u8 *) rmp);
    }
}

static void
vl_api_map_summary_stats_t_handler (vl_api_map_summary_stats_t * mp)
{
  vl_api_map_summary_stats_reply_t *rmp;
  vlib_combined_counter_main_t *cm;
  vlib_counter_t v;
  int i, which;
  u64 total_pkts[VLIB_N_RX_TX];
  u64 total_bytes[VLIB_N_RX_TX];
  map_main_t *mm = &map_main;
  vl_api_registration_t *reg;

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

  rmp = vl_msg_api_alloc (sizeof (*rmp));
  rmp->_vl_msg_id = htons (VL_API_MAP_SUMMARY_STATS_REPLY + mm->msg_id_base);
  rmp->context = mp->context;
  rmp->retval = 0;

  if (pool_elts (mm->domains) == 0)
    {
      rmp->retval = -1;
      goto out;
    }

  clib_memset (total_pkts, 0, sizeof (total_pkts));
  clib_memset (total_bytes, 0, sizeof (total_bytes));

  map_domain_counter_lock (mm);
  vec_foreach (cm, mm->domain_counters)
  {
    which = cm - mm->domain_counters;

    for (i = 0; i < vlib_combined_counter_n_counters (cm); i++)
      {
	vlib_get_combined_counter (cm, i, &v);
	total_pkts[which] += v.packets;
	total_bytes[which] += v.bytes;
      }
  }

  map_domain_counter_unlock (mm);

  /* Note: in network byte order! */
  rmp->total_pkts[MAP_DOMAIN_COUNTER_RX] =
    clib_host_to_net_u64 (total_pkts[MAP_DOMAIN_COUNTER_RX]);
  rmp->total_bytes[MAP_DOMAIN_COUNTER_RX] =
    clib_host_to_net_u64 (total_bytes[MAP_DOMAIN_COUNTER_RX]);
  rmp->total_pkts[MAP_DOMAIN_COUNTER_TX] =
    clib_host_to_net_u64 (total_pkts[MAP_DOMAIN_COUNTER_TX]);
  rmp->total_bytes[MAP_DOMAIN_COUNTER_TX] =
    clib_host_to_net_u64 (total_bytes[MAP_DOMAIN_COUNTER_TX]);
  rmp->total_bindings = clib_host_to_net_u64 (pool_elts (mm->domains));
  rmp->total_ip4_fragments = 0;	// Not yet implemented. Should be a simple counter.
  rmp->total_security_check[MAP_DOMAIN_COUNTER_TX] =
    clib_host_to_net_u64 (map_error_counter_get
			  (ip4_map_node.index, MAP_ERROR_ENCAP_SEC_CHECK));
  rmp->total_security_check[MAP_DOMAIN_COUNTER_RX] =
    clib_host_to_net_u64 (map_error_counter_get
			  (ip4_map_node.index, MAP_ERROR_DECAP_SEC_CHECK));

out:
  vl_api_send_msg (reg, (u8 *) rmp);
}


int
map_param_set_fragmentation (bool inner, bool ignore_df)
{
  map_main_t *mm = &map_main;

  mm->frag_inner = ! !inner;
  mm->frag_ignore_df = ! !ignore_df;

  return 0;
}

static void
  vl_api_map_param_set_fragmentation_t_handler
  (vl_api_map_param_set_fragmentation_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_param_set_fragmentation_reply_t *rmp;
  int rv = 0;

  rv = map_param_set_fragmentation (mp->inner, mp->ignore_df);

  REPLY_MACRO (VL_API_MAP_PARAM_SET_FRAGMENTATION_REPLY);
}


int
map_param_set_icmp (ip4_address_t * icmp_src_address)
{
  map_main_t *mm = &map_main;

  if (icmp_src_address == 0)
    return -1;

  mm->icmp4_src_address = *icmp_src_address;

  return 0;
}


static void
vl_api_map_param_set_icmp_t_handler (vl_api_map_param_set_icmp_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_param_set_icmp_reply_t *rmp;
  int rv;

  rv = map_param_set_icmp ((ip4_address_t *) & mp->ip4_err_relay_src);

  REPLY_MACRO (VL_API_MAP_PARAM_SET_ICMP_REPLY);
}


int
map_param_set_icmp6 (u8 enable_unreachable)
{
  map_main_t *mm = &map_main;

  mm->icmp6_enabled = ! !enable_unreachable;

  return 0;
}

static void
vl_api_map_param_set_icmp6_t_handler (vl_api_map_param_set_icmp6_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_param_set_icmp6_reply_t *rmp;
  int rv;

  rv = map_param_set_icmp6 (mp->enable_unreachable);

  REPLY_MACRO (VL_API_MAP_PARAM_SET_ICMP6_REPLY);
}


static void
  vl_api_map_param_add_del_pre_resolve_t_handler
  (vl_api_map_param_add_del_pre_resolve_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_param_add_del_pre_resolve_reply_t *rmp;
  int rv = 0;

  map_pre_resolve ((ip4_address_t *) & mp->ip4_nh_address,
		   (ip6_address_t *) & mp->ip6_nh_address, !mp->is_add);

  REPLY_MACRO (VL_API_MAP_PARAM_ADD_DEL_PRE_RESOLVE_REPLY);
}

int
map_param_set_security_check (bool enable, bool fragments)
{
  map_main_t *mm = &map_main;

  mm->sec_check = ! !enable;
  mm->sec_check_frag = ! !fragments;

  return 0;
}

static void
  vl_api_map_param_set_security_check_t_handler
  (vl_api_map_param_set_security_check_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_param_set_security_check_reply_t *rmp;
  int rv;

  rv = map_param_set_security_check (mp->enable, mp->fragments);

  REPLY_MACRO (VL_API_MAP_PARAM_SET_SECURITY_CHECK_REPLY);
}


int
map_param_set_traffic_class (bool copy, u8 tc)
{
  map_main_t *mm = &map_main;

  mm->tc_copy = ! !copy;
  mm->tc = tc;

  return 0;
}

static void
  vl_api_map_param_set_traffic_class_t_handler
  (vl_api_map_param_set_traffic_class_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_param_set_traffic_class_reply_t *rmp;
  int rv;

  rv = map_param_set_traffic_class (mp->copy, mp->tc_class);

  REPLY_MACRO (VL_API_MAP_PARAM_SET_TRAFFIC_CLASS_REPLY);
}


int
map_param_set_tcp (u16 tcp_mss)
{
  map_main_t *mm = &map_main;

  mm->tcp_mss = tcp_mss;

  return 0;
}


static void
vl_api_map_param_set_tcp_t_handler (vl_api_map_param_set_tcp_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_param_set_tcp_reply_t *rmp;
  int rv = 0;

  map_param_set_tcp (ntohs (mp->tcp_mss));
  REPLY_MACRO (VL_API_MAP_PARAM_SET_TCP_REPLY);
}


static void
vl_api_map_param_get_t_handler (vl_api_map_param_get_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_param_get_reply_t *rmp;
  vl_api_registration_t *reg;

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

  rmp = vl_msg_api_alloc (sizeof (*rmp));
  rmp->_vl_msg_id = htons (VL_API_MAP_PARAM_GET_REPLY + mm->msg_id_base);
  rmp->context = mp->context;
  rmp->retval = 0;

  rmp->frag_inner = mm->frag_inner;
  rmp->frag_ignore_df = mm->frag_ignore_df;

  clib_memcpy (&rmp->icmp_ip4_err_relay_src,
	       &mm->icmp4_src_address, sizeof (rmp->icmp_ip4_err_relay_src));

  rmp->icmp6_enable_unreachable = mm->icmp6_enabled;

  /*
   * FIXME: How are these addresses re-extracted from the FIB?
   * Or should a local map_main copy be kept?
   */
  clib_memset (&rmp->ip4_nh_address, 0, sizeof (rmp->ip4_nh_address));
  clib_memset (&rmp->ip6_nh_address, 0, sizeof (rmp->ip6_nh_address));

  rmp->sec_check_enable = mm->sec_check;
  rmp->sec_check_fragments = mm->sec_check_frag;

  rmp->tc_copy = mm->tc_copy;
  rmp->tc_class = mm->tc;

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


int
map_if_enable_disable (bool is_enable, u32 sw_if_index, bool is_translation)
{
  map_main_t *mm = &map_main;

  if (pool_is_free_index (mm->vnet_main->interface_main.sw_interfaces,
			  sw_if_index))
    return VNET_API_ERROR_INVALID_SW_IF_INDEX;

  is_enable = ! !is_enable;

  if (is_translation)
    {
      if (clib_bitmap_get (mm->bm_trans_enabled_by_sw_if, sw_if_index)
	  == is_enable)
	return 0;
    }
  else
    {
      if (clib_bitmap_get (mm->bm_encap_enabled_by_sw_if, sw_if_index)
	  == is_enable)
	return 0;
    }

  if (is_translation == false)
    {
      ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, is_enable);
      ip6_full_reass_enable_disable_with_refcnt (sw_if_index, is_enable);
      vnet_feature_enable_disable ("ip4-unicast", "ip4-map", sw_if_index,
				   is_enable ? 1 : 0, 0, 0);
      vnet_feature_enable_disable ("ip6-unicast", "ip6-map", sw_if_index,
				   is_enable ? 1 : 0, 0, 0);
      mm->bm_encap_enabled_by_sw_if =
	clib_bitmap_set (mm->bm_encap_enabled_by_sw_if, sw_if_index,
			 is_enable);
    }
  else
    {
      ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, is_enable);
      ip6_sv_reass_enable_disable_with_refcnt (sw_if_index, is_enable);
      vnet_feature_enable_disable ("ip4-unicast", "ip4-map-t", sw_if_index,
				   is_enable ? 1 : 0, 0, 0);
      vnet_feature_enable_disable ("ip6-unicast", "ip6-map-t", sw_if_index,
				   is_enable ? 1 : 0, 0, 0);
      mm->bm_trans_enabled_by_sw_if =
	clib_bitmap_set (mm->bm_trans_enabled_by_sw_if, sw_if_index,
			 is_enable);
    }

  return 0;
}


static void
vl_api_map_if_enable_disable_t_handler (vl_api_map_if_enable_disable_t * mp)
{
  map_main_t *mm = &map_main;
  vl_api_map_if_enable_disable_reply_t *rmp;
  int rv = 0;

  VALIDATE_SW_IF_INDEX (mp);

  rv =
    map_if_enable_disable (mp->is_enable, htonl (mp->sw_if_index),
			   mp->is_translation);

  BAD_SW_IF_INDEX_LABEL;
  REPLY_MACRO (VL_API_MAP_IF_ENABLE_DISABLE_REPLY);
}

/* API definitions */
#include <vnet/format_fns.h>
#include <map/map.api.c>

/* Set up the API message handling tables */
clib_error_t *
map_plugin_api_hookup (vlib_main_t * vm)
{
  map_main_t *mm = &map_main;

  mm->msg_id_base = setup_message_id_table ();

  return 0;
}

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