IPv6 ND Router discovery control plane (VPP-1095)

Change-Id: I4b5b60e7c6f618bb935eab1e96a2e79bbb14f58f
Signed-off-by: Juraj Sloboda <jsloboda@cisco.com>

2 files changed, 971 insertions, 0 deletions

diff --git a/src/vnet/ip/rd_cp.api b/src/vnet/ip/rd_cp.api
new file mode 100644
index 00000000000..9a3cdea43ca
--- /dev/null
+++ b/src/vnet/ip/rd_cp.api
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2018 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.
+ */
+
+option version = "1.0.0";
+
+/** \brief Enable/disable IPv6 ND address autoconfiguration
+           and setting up default routes
+    @param client_index - opaque cookie to identify the sender
+    @param context - sender context, to match reply w/ request
+    @param sw_if_index - interface to enable the autoconfigutation on
+    @param enable - 1 to enable address autoconfiguration, 0 to disable
+    @param install_default_routes - 1 to enable installing defaut routes,
+                                    0 to disable installing defaut routes,
+                                    the value is ignored (and taken as 0)
+                                    when enable param is set to 0
+*/
+autoreply define ip6_nd_address_autoconfig
+{
+  u32 client_index;
+  u32 context;
+  u32 sw_if_index;
+  u8 enable;
+  u8 install_default_routes;
+};
+
+/*
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/ip/rd_cp.c b/src/vnet/ip/rd_cp.c
new file mode 100644
index 00000000000..89a01e32643
--- /dev/null
+++ b/src/vnet/ip/rd_cp.c
@@ -0,0 +1,929 @@
+#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:
+ */