src/vnet/ip/rd_cp.c

#include <vnet/vnet.h>
#include <vlibmemory/api.h>
#include <vnet/vnet_msg_enum.h>
#include <vnet/ip/ip6.h>
#include <signal.h>
#include <math.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

#include <vlibapi/api_helper_macros.h>

#define foreach_rd_cp_msg                                                     \
_(IP6_ND_ADDRESS_AUTOCONFIG, ip6_nd_address_autoconfig)

#define foreach_client_rd_cp_msg                                              \
_(IP6_RA_EVENT, ip6_ra_event)                                                 \
_(IP6ND_SEND_ROUTER_SOLICITATION_REPLY, ip6nd_send_router_solicitation_reply) \
_(WANT_IP6_RA_EVENTS_REPLY, want_ip6_ra_events_reply)                         \
_(SW_INTERFACE_ADD_DEL_ADDRESS_REPLY, sw_interface_add_del_address_reply)     \
_(IP_ADD_DEL_ROUTE_REPLY, ip_add_del_route_reply)                             \
_(SW_INTERFACE_GET_MAC_ADDRESS_REPLY, sw_interface_get_mac_address_reply)     \
_(SW_INTERFACE_IP6_ENABLE_DISABLE_REPLY, sw_interface_ip6_enable_disable_reply)

typedef struct
{
  u32 sw_if_index;
  u8 address_length;
  ip6_address_t address;
  f64 due_time;
} slaac_address_t;

typedef struct
{
  u32 sw_if_index;
  ip6_address_t router_address;
  f64 due_time;
} default_route_t;

typedef struct
{
  u8 enabled;
  u8 install_default_routes;
} interface_config_t;

typedef struct
{
  u8 enabled;
  u8 events_on;

  interface_config_t *config_by_sw_if_index;
  slaac_address_t *slaac_address_pool;
  default_route_t *default_route_pool;

  /* binary API client */
  u8 api_connected;
  svm_queue_t *vl_input_queue;
  u32 my_client_index;
  void (**msg_handlers) (void *);
  struct
  {
    u8 arrived;
    i32 retval;
    union
    {
      u8 mac_address[6];
    };
  } api_reply;

  /* convenience */
  vlib_main_t *vlib_main;
  vnet_main_t *vnet_main;
  api_main_t *api_main;
  u32 node_index;
} rd_cp_main_t;

rd_cp_main_t rd_cp_main;

enum
{
  RD_CP_EVENT_INTERRUPT,
};

#define vl_api_ip6_nd_address_autoconfig_t_print vl_noop_handler

static void
msg_api_config (vl_msg_api_msg_config_t * c)
{
  rd_cp_main_t *rm = &rd_cp_main;

  vec_validate (rm->msg_handlers, c->id);

  if (rm->msg_handlers[c->id] && rm->msg_handlers[c->id] != c->handler)
    clib_warning
      ("BUG: re-registering 'vl_api_%s_t_handler'."
       "Handler was %llx, replaced by %llx",
       c->name, rm->msg_handlers[c->id], c->handler);

  rm->msg_handlers[c->id] = c->handler;
}

static void
set_handler (int id, char *name, void *handler)
{
  vl_msg_api_msg_config_t cfg;
  vl_msg_api_msg_config_t *c = &cfg;

  memset (c, 0, sizeof (*c));

  c->id = id;
  c->name = name;
  c->handler = handler;
  c->replay = 1;
  c->message_bounce = 0;
  c->is_mp_safe = 0;
  msg_api_config (c);
}

static_always_inline void
check_queue (void)
{
  rd_cp_main_t *rm = &rd_cp_main;
  uword msgp;

  if (!rm->api_connected)
    return;

  if (svm_queue_sub2 (rm->vl_input_queue, (u8 *) & msgp))
    return;

  u16 id = ntohs (*((u16 *) msgp));
  u8 *(*handler) (void *);

  if (id < vec_len (rm->msg_handlers) && rm->msg_handlers[id])
    {
      handler = (void *) rm->msg_handlers[id];
      (*handler) ((void *) msgp);
    }
  else
    {
      if (id != VL_API_MEMCLNT_KEEPALIVE)
	clib_warning ("no handler for msg id %d", id);
    }
}

static_always_inline int
wait_for_reply (void)
{
  rd_cp_main_t *rm = &rd_cp_main;
  vlib_main_t *vm = rm->vlib_main;
  f64 timeout;

  timeout = vlib_time_now (vm) + 1.0;
  while (vlib_time_now (vm) < timeout)
    {
      check_queue ();
      if (rm->api_reply.arrived)
	break;
      vlib_process_suspend (vm, 1e-5);
    }

  if (!rm->api_reply.arrived)
    return 1;

  return rm->api_reply.retval;
}

static_always_inline void
send_msg (void *msg)
{
  rd_cp_main_t *rm = &rd_cp_main;

  vl_msg_api_send_shmem (rm->api_main->shmem_hdr->vl_input_queue,
			 (u8 *) & msg);
}

static_always_inline int
send_msg_and_wait_for_reply (void *msg)
{
  rd_cp_main_t *rm = &rd_cp_main;

  rm->api_reply.arrived = 0;
  send_msg (msg);
  return wait_for_reply ();
}

static int
router_solicitation_start_stop (u32 sw_if_index, u8 start)
{
  rd_cp_main_t *rm = &rd_cp_main;
  vl_api_ip6nd_send_router_solicitation_t *mp;
  int rv;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = htons (VL_API_IP6ND_SEND_ROUTER_SOLICITATION);
  mp->client_index = rm->my_client_index;
  mp->sw_if_index = htonl (sw_if_index);
  if (start)
    {
      mp->irt = htonl (1);
      mp->mrt = htonl (120);
    }
  else
    mp->stop = 1;

  rv = send_msg_and_wait_for_reply (mp);

  return rv;
}

static void
  vl_api_ip6nd_send_router_solicitation_reply_t_handler
  (vl_api_ip6nd_send_router_solicitation_reply_t * mp)
{
  rd_cp_main_t *rm = &rd_cp_main;

  rm->api_reply.arrived = 1;
  rm->api_reply.retval = ntohl (mp->retval);
}

static int
ip6_ra_events_enable_disable (int enable)
{
  rd_cp_main_t *rm = &rd_cp_main;
  vl_api_want_ip6_ra_events_t *mp;
  int rv;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = htons (VL_API_WANT_IP6_RA_EVENTS);
  mp->client_index = rm->my_client_index;
  mp->enable_disable = enable;
  mp->pid = htonl (getpid ());

  rv = send_msg_and_wait_for_reply (mp);

  if (!rv)
    rm->events_on = enable;

  return rv;
}

static void
vl_api_want_ip6_ra_events_reply_t_handler (vl_api_want_ip6_ra_events_reply_t *
					   mp)
{
  rd_cp_main_t *rm = &rd_cp_main;

  rm->api_reply.arrived = 1;
  rm->api_reply.retval = ntohl (mp->retval);
}

static void interrupt_process (void);

static int
add_slaac_address (vlib_main_t * vm, u32 sw_if_index, u8 address_length,
		   ip6_address_t * address, f64 due_time)
{
  rd_cp_main_t *rm = &rd_cp_main;
  slaac_address_t *slaac_address;
  vl_api_sw_interface_add_del_address_t *mp;
  int rv;

  pool_get (rm->slaac_address_pool, slaac_address);

  slaac_address->sw_if_index = sw_if_index;
  slaac_address->address_length = address_length;
  slaac_address->address = *address;
  slaac_address->due_time = due_time;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = htons (VL_API_SW_INTERFACE_ADD_DEL_ADDRESS);
  mp->client_index = rm->my_client_index;
  mp->is_add = 1;
  mp->is_ipv6 = 1;
  mp->sw_if_index = htonl (sw_if_index);
  mp->address_length = slaac_address->address_length;
  clib_memcpy (mp->address, slaac_address->address.as_u8, 16);

  rv = send_msg_and_wait_for_reply (mp);

  return rv;
}

static void
  vl_api_sw_interface_add_del_address_reply_t_handler
  (vl_api_sw_interface_add_del_address_reply_t * mp)
{
  rd_cp_main_t *rm = &rd_cp_main;

  rm->api_reply.arrived = 1;
  rm->api_reply.retval = ntohl (mp->retval);
}

static int
add_default_route (vlib_main_t * vm, u32 sw_if_index,
		   ip6_address_t * next_hop_address, f64 due_time)
{
  rd_cp_main_t *rm = &rd_cp_main;
  default_route_t *default_route;
  vl_api_ip_add_del_route_t *mp;
  int rv;

  pool_get (rm->default_route_pool, default_route);

  default_route->sw_if_index = sw_if_index;
  default_route->router_address = *next_hop_address;
  default_route->due_time = due_time;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = htons (VL_API_IP_ADD_DEL_ROUTE);
  mp->client_index = rm->my_client_index;
  mp->is_add = 1;
  mp->is_ipv6 = 1;
  mp->dst_address_length = 0;
  mp->next_hop_sw_if_index = htonl (default_route->sw_if_index);
  clib_memcpy (mp->next_hop_address, default_route->router_address.as_u8, 16);

  rv = send_msg_and_wait_for_reply (mp);

  return rv;
}

static void
vl_api_ip_add_del_route_reply_t_handler (vl_api_ip_add_del_route_reply_t * mp)
{
  rd_cp_main_t *rm = &rd_cp_main;

  rm->api_reply.arrived = 1;
  rm->api_reply.retval = ntohl (mp->retval);
}

static int
remove_slaac_address (vlib_main_t * vm, slaac_address_t * slaac_address)
{
  rd_cp_main_t *rm = &rd_cp_main;
  vl_api_sw_interface_add_del_address_t *mp;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = htons (VL_API_SW_INTERFACE_ADD_DEL_ADDRESS);
  mp->client_index = rm->my_client_index;
  mp->is_add = 0;
  mp->is_ipv6 = 1;
  mp->sw_if_index = htonl (slaac_address->sw_if_index);
  mp->address_length = slaac_address->address_length;
  clib_memcpy (mp->address, slaac_address->address.as_u8, 16);

  send_msg_and_wait_for_reply (mp);

  pool_put (rm->slaac_address_pool, slaac_address);

  return 0;
}

static int
remove_default_route (vlib_main_t * vm, default_route_t * default_route)
{
  rd_cp_main_t *rm = &rd_cp_main;
  vl_api_ip_add_del_route_t *mp;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = htons (VL_API_IP_ADD_DEL_ROUTE);
  mp->client_index = rm->my_client_index;
  mp->is_add = 0;
  mp->is_ipv6 = 1;
  mp->dst_address_length = 0;
  mp->next_hop_sw_if_index = htonl (default_route->sw_if_index);
  clib_memcpy (mp->next_hop_address, default_route->router_address.as_u8, 16);

  send_msg_and_wait_for_reply (mp);

  pool_put (rm->default_route_pool, default_route);

  return 0;
}

static u32
get_interface_mac_address (u32 sw_if_index, u8 mac[])
{
  rd_cp_main_t *rm = &rd_cp_main;
  vl_api_sw_interface_get_mac_address_t *mp;
  int rv;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = htons (VL_API_SW_INTERFACE_GET_MAC_ADDRESS);
  mp->client_index = rm->my_client_index;
  mp->sw_if_index = htonl (sw_if_index);

  rv = send_msg_and_wait_for_reply (mp);

  if (!rv)
    clib_memcpy (mac, rm->api_reply.mac_address, 6);

  return rv;
}

static void
  vl_api_sw_interface_get_mac_address_reply_t_handler
  (vl_api_sw_interface_get_mac_address_reply_t * mp)
{
  rd_cp_main_t *rm = &rd_cp_main;

  rm->api_reply.arrived = 1;
  rm->api_reply.retval = ntohl (mp->retval);

  if (rm->api_reply.retval == 0)
    clib_memcpy (rm->api_reply.mac_address, mp->mac_address, 6);
}

static u32
ip6_enable (u32 sw_if_index)
{
  rd_cp_main_t *rm = &rd_cp_main;
  vl_api_sw_interface_ip6_enable_disable_t *mp;
  int rv;

  mp = vl_msg_api_alloc (sizeof (*mp));
  memset (mp, 0, sizeof (*mp));
  mp->_vl_msg_id = htons (VL_API_SW_INTERFACE_IP6_ENABLE_DISABLE);
  mp->client_index = rm->my_client_index;
  mp->sw_if_index = htonl (sw_if_index);
  mp->enable = 1;

  rv = send_msg_and_wait_for_reply (mp);

  return rv;
}

static void
  vl_api_sw_interface_ip6_enable_disable_reply_t_handler
  (vl_api_sw_interface_ip6_enable_disable_reply_t * mp)
{
  rd_cp_main_t *rm = &rd_cp_main;

  rm->api_reply.arrived = 1;
  rm->api_reply.retval = ntohl (mp->retval);
}

static u8
ip6_prefixes_equal (ip6_address_t * prefix1, ip6_address_t * prefix2, u8 len)
{
  if (len >= 64)
    {
      if (prefix1->as_u64[0] != prefix2->as_u64[0])
	return 0;
      if (len == 64)
	return 1;
      return prefix1->as_u64[1] >> (128 - len) ==
	prefix2->as_u64[1] >> (128 - len);
    }
  return prefix1->as_u64[0] >> (64 - len) == prefix2->as_u64[0] >> (64 - len);
}

#define PREFIX_FLAG_A (1 << 6)
#define PREFIX_FLAG_L (1 << 7)

static void
vl_api_ip6_ra_event_t_handler (vl_api_ip6_ra_event_t * mp)
{
  rd_cp_main_t *rm = &rd_cp_main;
  vlib_main_t *vm = rm->vlib_main;
  interface_config_t *if_config;
  default_route_t *default_route;
  slaac_address_t *slaac_address;
  u32 sw_if_index;
  u16 router_lifetime_in_sec;
  u32 n_prefixes;
  vl_api_ip6_ra_prefix_info_t *prefix;
  u8 mac[6];
  f64 current_time;
  u32 i;

  current_time = vlib_time_now (vm);

  sw_if_index = ntohl (mp->sw_if_index);

  if_config = &rm->config_by_sw_if_index[sw_if_index];

  if (if_config->install_default_routes)
    {
      router_lifetime_in_sec = ntohs (mp->router_lifetime_in_sec);
      u8 route_already_present = 0;
      /* *INDENT-OFF* */
      pool_foreach (default_route, rm->default_route_pool,
      ({
        if (default_route->sw_if_index != sw_if_index)
          ;
        else if (0 != memcmp (&default_route->router_address,
                              mp->router_address, 16))
          ;
        else
          {
            route_already_present = 1;
            goto default_route_pool_foreach_out;
          }
      }));
      /* *INDENT-ON* */
    default_route_pool_foreach_out:

      if (!route_already_present)
	{
	  if (router_lifetime_in_sec != 0)
	    add_default_route (vm, sw_if_index, (void *) mp->router_address,
			       current_time + router_lifetime_in_sec);
	}
      else
	{
	  if (router_lifetime_in_sec != 0)
	    default_route->due_time = current_time + router_lifetime_in_sec;
	  else
	    remove_default_route (vm, default_route);
	}
    }

  if (get_interface_mac_address (sw_if_index, mac) != 0)
    {
      clib_warning ("Error getting MAC address");
      return;
    }

  if (!if_config->enabled)
    return;

  n_prefixes = ntohl (mp->n_prefixes);
  for (i = 0; i < n_prefixes; i++)
    {
      ip6_address_t *dst_address;
      u8 prefix_length;
      u32 valid_time;
      u32 preferred_time;
      f64 due_time;

      prefix = &mp->prefixes[i];

      if (!(prefix->flags & PREFIX_FLAG_A))
	continue;

      dst_address = (ip6_address_t *) prefix->dst_address;
      prefix_length = prefix->dst_address_length;

      if (ip6_address_is_link_local_unicast (dst_address))
	continue;

      valid_time = ntohl (prefix->valid_time);
      preferred_time = ntohl (prefix->preferred_time);

      if (preferred_time > valid_time)
	continue;

      if (prefix_length != 64)
	continue;

      u8 address_already_present = 0;
      /* *INDENT-OFF* */
      pool_foreach (slaac_address, rm->slaac_address_pool,
      ({
        if (slaac_address->sw_if_index != sw_if_index)
          ;
        else if (slaac_address->address_length != prefix_length)
          ;
        else if (!ip6_prefixes_equal (&slaac_address->address, dst_address,
                                 prefix_length))
          ;
        else
          {
            address_already_present = 1;
            goto slaac_address_pool_foreach_out;
          }
      }));
      /* *INDENT-ON* */
    slaac_address_pool_foreach_out:

      if (address_already_present)
	{
	  f64 remaining_life_time = slaac_address->due_time - current_time;
	  if (valid_time > 2 * 60 * 60 || valid_time > remaining_life_time)
	    slaac_address->due_time = current_time + valid_time;
	  else if (remaining_life_time > 2 * 60 * 60)
	    slaac_address->due_time = current_time + 2 * 60 * 60;
	  continue;
	}

      if (valid_time == 0)
	continue;

      due_time = current_time + valid_time;

      ip6_address_t addr;
      addr.as_u64[0] = dst_address->as_u64[0];
      /* Invert the "u" bit */
      addr.as_u8[8] = mac[0] ^ (1 << 1);
      addr.as_u8[9] = mac[1];
      addr.as_u8[10] = mac[2];
      addr.as_u8[11] = 0xFF;
      addr.as_u8[12] = 0xFE;
      addr.as_u8[13] = mac[3];
      addr.as_u8[14] = mac[4];
      addr.as_u8[15] = mac[5];

      add_slaac_address (vm, sw_if_index, prefix_length, &addr, due_time);
    }

  interrupt_process ();
}

static uword
rd_cp_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f)
{
  uword event_type;
  uword *event_data = 0;
  rd_cp_main_t *rm = &rd_cp_main;
  slaac_address_t *slaac_address;
  default_route_t *default_route;
  f64 sleep_time = 1e9;
  const f64 micro_sleep_time = 1e-5;
  f64 start_time;
  f64 current_time;
  f64 due_time;

  while (1)
    {
      start_time = vlib_time_now (vm);

      while (1)
	{
	  check_queue ();
	  vlib_process_wait_for_event_or_clock (vm, micro_sleep_time);
	  event_type = vlib_process_get_events (vm, &event_data);
	  if (event_type != ~0
	      || vlib_time_now (vm) > start_time + sleep_time)
	    break;
	}

      vec_reset_length (event_data);

      current_time = vlib_time_now (vm);
      do
	{
	  due_time = current_time + 1e9;
          /* *INDENT-OFF* */
          pool_foreach (slaac_address, rm->slaac_address_pool,
          ({
            if (slaac_address->due_time > current_time)
              {
                if (slaac_address->due_time < due_time)
                  due_time = slaac_address->due_time;
              }
            else
              {
                remove_slaac_address (vm, slaac_address);
                /* make sure ip6 stays enabled */
                ip6_enable (slaac_address->sw_if_index);
              }
          }));
          pool_foreach (default_route, rm->default_route_pool,
          ({
            if (default_route->due_time > current_time)
              {
                if (default_route->due_time < due_time)
                  due_time = default_route->due_time;
              }
            else
              remove_default_route (vm, default_route);
          }));
          /* *INDENT-ON* */
	  current_time = vlib_time_now (vm);
	}
      while (due_time < current_time);

      sleep_time = due_time - current_time;
    }

  return 0;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (rd_cp_process_node) = {
    .function = rd_cp_process,
    .type = VLIB_NODE_TYPE_PROCESS,
    .name = "rd-cp-process",
};
/* *INDENT-ON* */

static void
interrupt_process (void)
{
  rd_cp_main_t *rm = &rd_cp_main;
  vlib_main_t *vm = rm->vlib_main;

  vlib_process_signal_event (vm, rd_cp_process_node.index,
			     RD_CP_EVENT_INTERRUPT, 0);
}

static int
create_api_loopback (void)
{
  rd_cp_main_t *rm = &rd_cp_main;
  api_main_t *am = &api_main;
  svm_region_t *svm;

  svm = am->vlib_rp;

  pthread_mutex_lock (&svm->mutex);
  rd_cp_main.vl_input_queue =
    svm_queue_init (1024, sizeof (uword), getpid (), 0);
  pthread_mutex_unlock (&svm->mutex);

  rd_cp_main.my_client_index =
    vl_api_memclnt_create_internal ("ndp_rd_client",
				    rd_cp_main.vl_input_queue);

  rm->api_connected = 1;

  return 0;
}

static int
set_address_autoconfig (u32 sw_if_index, u8 enable, u8 install_default_routes)
{
  rd_cp_main_t *rm = &rd_cp_main;
  vlib_main_t *vm = rm->vlib_main;
  vnet_main_t *vnm = rm->vnet_main;
  interface_config_t *if_config;
  interface_config_t empty_config = { 0, 0 };
  slaac_address_t *slaac_address;
  default_route_t *default_route;

  if (!enable)
    install_default_routes = 0;

  // TODO: makes direct interaction with data plane
  if (!vnet_sw_interface_is_api_valid (vnm, sw_if_index))
    {
      clib_warning ("Invalid sw_if_index");
      return 1;
    }

  if (!rm->enabled)
    {
      create_api_loopback ();
      /* process kickoff */
      interrupt_process ();
      ip6_ra_events_enable_disable (1);
      rm->enabled = 1;
    }

  vec_validate_init_empty (rm->config_by_sw_if_index, sw_if_index,
			   empty_config);
  if_config = &rm->config_by_sw_if_index[sw_if_index];

  if (!if_config->enabled && enable)
    ip6_enable (sw_if_index);

  if ((!if_config->enabled && enable)
      || (!if_config->install_default_routes && install_default_routes))
    router_solicitation_start_stop (sw_if_index, 1);
  else if (if_config->enabled && !enable)
    router_solicitation_start_stop (sw_if_index, 0);

  if (if_config->enabled && !enable)
    {
      /* *INDENT-OFF* */
      pool_foreach (slaac_address, rm->slaac_address_pool,
      ({
          remove_slaac_address (vm, slaac_address);
      }));
      /* *INDENT-ON* */
    }
  if (if_config->install_default_routes && !install_default_routes)
    {
      /* *INDENT-OFF* */
      pool_foreach (default_route, rm->default_route_pool,
      ({
          remove_default_route (vm, default_route);
      }));
      /* *INDENT-ON* */
    }

  if_config->enabled = enable;
  if_config->install_default_routes = install_default_routes;

  return 0;
}

static clib_error_t *
ip6_nd_address_autoconfig (vlib_main_t * vm,
			   unformat_input_t * input, vlib_cli_command_t * cmd)
{
  rd_cp_main_t *rm = &rd_cp_main;
  vnet_main_t *vnm = rm->vnet_main;
  clib_error_t *error = 0;
  u32 sw_if_index = ~0;
  u8 enable = 1;
  u8 default_route = 0;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat
	  (input, "%U", unformat_vnet_sw_interface, vnm, &sw_if_index))
	;
      if (unformat (input, "default-route"))
	default_route = 1;
      if (unformat (input, "disable"))
	enable = 0;
      else
	break;
    }

  if (sw_if_index != ~0)
    {
      if (set_address_autoconfig (sw_if_index, enable, default_route) != 0)
	error = clib_error_return (0, "Invalid sw_if_index");
    }
  else
    error = clib_error_return (0, "Missing sw_if_index");

  return error;
}

/*?
 * This command is used to enable ND address autoconfiguration
 * on particular interface including setting up default routes.
 *
 * @cliexpar
 * @parblock
 * Example of how to enable ND address autoconfiguration:
 * @cliexcmd{ip6 nd address autoconfig GigabitEthernet2/0/0}
 * Example of how to enable ND address autoconfiguration
 * with setting up default routes:
 * @cliexcmd{ip6 nd address autoconfig GigabitEthernet2/0/0 default-route}
 * Example of how to disable ND address autoconfiguration:
 * @cliexcmd{ip6 nd address autoconfig GigabitEthernet2/0/0 disable}
 * @endparblock
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (ip6_nd_address_autoconfig_command, static) = {
  .path = "ip6 nd address autoconfig",
  .short_help = "ip6 nd address autoconfig <interface> [default-route|disable]",
  .function = ip6_nd_address_autoconfig,
};
/* *INDENT-ON* */

static void
vl_api_ip6_nd_address_autoconfig_t_handler (vl_api_ip6_nd_address_autoconfig_t
					    * mp)
{
  vl_api_ip6_nd_address_autoconfig_reply_t *rmp;
  u32 sw_if_index;
  int rv = 0;

  VALIDATE_SW_IF_INDEX (mp);

  sw_if_index = ntohl (mp->sw_if_index);

  rv =
    set_address_autoconfig (sw_if_index, mp->enable,
			    mp->install_default_routes);

  BAD_SW_IF_INDEX_LABEL;

  REPLY_MACRO (VL_API_SW_INTERFACE_SET_TABLE_REPLY);
}

#define vl_msg_name_crc_list
#include <vnet/ip/rd_cp.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_rd_cp;
#undef _
}

static clib_error_t *
rd_cp_init (vlib_main_t * vm)
{
  rd_cp_main_t *rm = &rd_cp_main;
  api_main_t *am = &api_main;

  rm->vlib_main = vm;
  rm->vnet_main = vnet_get_main ();
  rm->api_main = am;
  rm->node_index = rd_cp_process_node.index;

#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), 0/* do NOT trace! */);
  foreach_rd_cp_msg;
#undef _

#define _(N,n)                                                  \
    set_handler(VL_API_##N, #n, vl_api_##n##_t_handler);
  foreach_client_rd_cp_msg;
#undef _

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

  return 0;
}

VLIB_INIT_FUNCTION (rd_cp_init);

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