ip: Protocol Independent IP Neighbors

Type: feature

 - ip-neighbour: generic neighbour handling; APIs, DBs, event handling,
aging
 - arp: ARP protocol implementation
 - ip6-nd; IPv6 neighbor discovery implementation; separate ND,
MLD, RA
 - ip6-link; manage link-local addresses
 - l2-arp-term; events separated from IP neighbours, since they are not
the same.

vnet retains just enough education to perform ND/ARP packet
construction.
arp and ip6-nd to be moved to plugins soon.

Change-Id: I88dedd0006b299344f4c7024a0aa5baa6b9a8bbe
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 2261 insertions, 0 deletions

diff --git a/src/vnet/ip6-nd/ip6_ra.c b/src/vnet/ip6-nd/ip6_ra.c
new file mode 100644
index 00000000000..ebc2c4be417
--- /dev/null
+++ b/src/vnet/ip6-nd/ip6_ra.c
@@ -0,0 +1,2261 @@
+/*
+ * ip/ip6_neighbor.c: IP6 neighbor handling
+ *
+ * Copyright (c) 2010 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/ip6-nd/ip6_ra.h>
+
+#include <vnet/ip/ip.h>
+#include <vnet/ip-neighbor/ip_neighbor_dp.h>
+
+#include <vnet/fib/ip6_fib.h>
+#include <vnet/ip/ip6_link.h>
+
+/**
+ * @file
+ * @brief IPv6 Router Advertisements.
+ *
+ * The files contains the API and CLI code for managing IPv6 RAs
+ */
+
+/* *INDENT-OFF* */
+/* Router solicitation packet format for ethernet. */
+typedef CLIB_PACKED (struct
+{
+    ip6_header_t ip;
+    icmp6_neighbor_discovery_header_t neighbor;
+    icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
+    link_layer_option;
+}) icmp6_router_solicitation_header_t;
+
+/* router advertisement packet format for ethernet. */
+typedef CLIB_PACKED (struct
+{
+  ip6_header_t ip;
+  icmp6_router_advertisement_header_t router;
+  icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
+  link_layer_option;
+  icmp6_neighbor_discovery_mtu_option_t mtu_option;
+  icmp6_neighbor_discovery_prefix_information_option_t
+  prefix[0];
+}) icmp6_router_advertisement_packet_t;
+/* *INDENT-ON* */
+
+#define DEF_MAX_RADV_INTERVAL 200
+#define DEF_MIN_RADV_INTERVAL .75 * DEF_MAX_RADV_INTERVAL
+#define DEF_CURR_HOP_LIMIT  64
+#define DEF_DEF_RTR_LIFETIME   3 * DEF_MAX_RADV_INTERVAL
+#define MAX_DEF_RTR_LIFETIME   9000
+
+#define MAX_INITIAL_RTR_ADVERT_INTERVAL   16	/* seconds */
+#define MAX_INITIAL_RTR_ADVERTISEMENTS        3	/*transmissions */
+#define MIN_DELAY_BETWEEN_RAS                              3	/* seconds */
+#define MAX_DELAY_BETWEEN_RAS                    1800	/* seconds */
+#define MAX_RA_DELAY_TIME                                          .5	/* seconds */
+
+/* advertised prefix option */
+typedef struct
+{
+  /* basic advertised information */
+  ip6_address_t prefix;
+  u8 prefix_len;
+  int adv_on_link_flag;
+  int adv_autonomous_flag;
+  u32 adv_valid_lifetime_in_secs;
+  u32 adv_pref_lifetime_in_secs;
+
+  /* advertised values are computed from these times if decrementing */
+  f64 valid_lifetime_expires;
+  f64 pref_lifetime_expires;
+
+  /* local information */
+  int enabled;
+  int deprecated_prefix_flag;
+  int decrement_lifetime_flag;
+
+#define MIN_ADV_VALID_LIFETIME 7203	/* seconds */
+#define DEF_ADV_VALID_LIFETIME  2592000
+#define DEF_ADV_PREF_LIFETIME 604800
+
+  /* extensions are added here, mobile, DNS etc.. */
+} ip6_radv_prefix_t;
+
+typedef struct ip6_ra_t_
+{
+  /* advertised config information, zero means unspecified  */
+  u8 curr_hop_limit;
+  int adv_managed_flag;
+  int adv_other_flag;
+  u16 adv_router_lifetime_in_sec;
+  u32 adv_neighbor_reachable_time_in_msec;
+  u32 adv_time_in_msec_between_retransmitted_neighbor_solicitations;
+
+  /* mtu option */
+  u32 adv_link_mtu;
+
+  /* local information */
+  u32 sw_if_index;
+  int send_radv;		/* radv on/off on this interface -  set by config */
+  int cease_radv;		/* we are ceasing  to send  - set byf config */
+  int send_unicast;
+  int adv_link_layer_address;
+  int prefix_option;
+  int failed_device_check;
+  int ref_count;
+
+  /* prefix option */
+  ip6_radv_prefix_t *adv_prefixes_pool;
+
+  /* Hash table mapping address to index in interface advertised  prefix pool. */
+  mhash_t address_to_prefix_index;
+
+  f64 max_radv_interval;
+  f64 min_radv_interval;
+  f64 min_delay_between_radv;
+  f64 max_delay_between_radv;
+  f64 max_rtr_default_lifetime;
+
+  f64 last_radv_time;
+  f64 last_multicast_time;
+  f64 next_multicast_time;
+
+
+  u32 initial_adverts_count;
+  f64 initial_adverts_interval;
+  u32 initial_adverts_sent;
+
+  /* stats */
+  u32 n_advertisements_sent;
+  u32 n_solicitations_rcvd;
+  u32 n_solicitations_dropped;
+
+  /* router solicitations sending state */
+  u8 keep_sending_rs;		/* when true then next fields are valid */
+  icmp6_send_router_solicitation_params_t params;
+  f64 sleep_interval;
+  f64 due_time;
+  u32 n_left;
+  f64 start_time;
+  vlib_buffer_t *buffer;
+
+  u32 seed;
+
+} ip6_ra_t;
+
+static ip6_link_delegate_id_t ip6_ra_delegate_id;
+static ip6_ra_t *ip6_ra_pool;
+
+
+/* vector of registered RA report listeners */
+static ip6_ra_report_notify_t *ip6_ra_listeners;
+
+static int ip6_ra_publish (ip6_ra_report_t * r);
+
+void
+ip6_ra_report_register (ip6_ra_report_notify_t fn)
+{
+  ip6_ra_report_notify_t *listener;
+  vec_foreach (listener, ip6_ra_listeners)
+  {
+    if (*listener == fn)
+      return;
+  }
+
+  vec_add1 (ip6_ra_listeners, fn);
+}
+
+void
+ip6_ra_report_unregister (ip6_ra_report_notify_t fn)
+{
+  u32 ii;
+
+  vec_foreach_index (ii, ip6_ra_listeners)
+  {
+    if (ip6_ra_listeners[ii] == fn)
+      {
+	vec_del1 (ip6_ra_listeners, ii);
+	break;
+      }
+  }
+}
+
+static inline ip6_ra_t *
+ip6_ra_get_itf (u32 sw_if_index)
+{
+  index_t rai;
+
+  rai = ip6_link_delegate_get (sw_if_index, ip6_ra_delegate_id);
+
+  if (INDEX_INVALID != rai)
+    return (pool_elt_at_index (ip6_ra_pool, rai));
+
+  return (NULL);
+}
+
+/* for "syslogging" - use elog for now */
+#define foreach_log_level	     \
+  _ (DEBUG, "DEBUG")                 \
+  _ (INFO, "INFORMATION")	     \
+  _ (NOTICE, "NOTICE")		     \
+  _ (WARNING, "WARNING")             \
+  _ (ERR, "ERROR")	             \
+  _ (CRIT, "CRITICAL")               \
+  _ (ALERT, "ALERT")                 \
+  _ (EMERG,  "EMERGENCY")
+
+typedef enum
+{
+#define _(f,s) LOG_##f,
+  foreach_log_level
+#undef _
+} log_level_t;
+
+static char *log_level_strings[] = {
+#define _(f,s) s,
+  foreach_log_level
+#undef _
+};
+
+static int logmask = 1 << LOG_DEBUG;
+
+static void
+ip6_neighbor_syslog (vlib_main_t * vm, int priority, char *fmt, ...)
+{
+  /* just use elog for now */
+  u8 *what;
+  va_list va;
+
+  if ((priority > LOG_EMERG) || !(logmask & (1 << priority)))
+    return;
+
+  va_start (va, fmt);
+  if (fmt)
+    {
+      what = va_format (0, fmt, &va);
+
+      ELOG_TYPE_DECLARE (e) =
+      {
+      .format = "ip6 nd:  (%s): %s",.format_args = "T4T4",};
+      struct
+      {
+	u32 s[2];
+      } *ed;
+      ed = ELOG_DATA (&vm->elog_main, e);
+      ed->s[0] = elog_string (&vm->elog_main, log_level_strings[priority]);
+      ed->s[1] = elog_string (&vm->elog_main, (char *) what);
+    }
+  va_end (va);
+  return;
+}
+
+/* ipv6 neighbor discovery - router advertisements */
+typedef enum
+{
+  ICMP6_ROUTER_SOLICITATION_NEXT_DROP,
+  ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW,
+  ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX,
+  ICMP6_ROUTER_SOLICITATION_N_NEXT,
+} icmp6_router_solicitation_or_advertisement_next_t;
+
+static_always_inline uword
+icmp6_router_solicitation (vlib_main_t * vm,
+			   vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  ip6_main_t *im = &ip6_main;
+  uword n_packets = frame->n_vectors;
+  u32 *from, *to_next;
+  u32 n_left_from, n_left_to_next, next_index;
+  u32 n_advertisements_sent = 0;
+  int bogus_length;
+
+  icmp6_neighbor_discovery_option_type_t option_type;
+
+  vlib_node_runtime_t *error_node =
+    vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = n_packets;
+  next_index = node->cached_next_index;
+
+  if (node->flags & VLIB_NODE_FLAG_TRACE)
+    vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
+				   /* stride */ 1,
+				   sizeof (icmp6_input_trace_t));
+
+  /* source may append his LL address */
+  option_type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
+
+  while (n_left_from > 0)
+    {
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  vlib_buffer_t *p0;
+	  ip6_header_t *ip0;
+	  ip6_ra_t *radv_info = NULL;
+
+	  icmp6_neighbor_discovery_header_t *h0;
+	  icmp6_neighbor_discovery_ethernet_link_layer_address_option_t *o0;
+
+	  u32 bi0, options_len0, sw_if_index0, next0, error0;
+	  u32 is_solicitation = 1, is_dropped = 0;
+	  u32 is_unspecified, is_link_local;
+
+	  bi0 = to_next[0] = from[0];
+
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+
+	  p0 = vlib_get_buffer (vm, bi0);
+	  ip0 = vlib_buffer_get_current (p0);
+	  h0 = ip6_next_header (ip0);
+	  options_len0 =
+	    clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
+	  is_unspecified = ip6_address_is_unspecified (&ip0->src_address);
+	  is_link_local =
+	    ip6_address_is_link_local_unicast (&ip0->src_address);
+
+	  error0 = ICMP6_ERROR_NONE;
+	  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
+
+	  /* check if solicitation  (not from nd_timer node) */
+	  if (ip6_address_is_unspecified (&ip0->dst_address))
+	    is_solicitation = 0;
+
+	  /* Check that source address is unspecified, link-local or else on-link. */
+	  if (!is_unspecified && !is_link_local)
+	    {
+	      u32 src_adj_index0 = ip6_src_lookup_for_packet (im, p0, ip0);
+
+	      if (ADJ_INDEX_INVALID != src_adj_index0)
+		{
+		  ip_adjacency_t *adj0 = adj_get (src_adj_index0);
+
+		  error0 = (adj0->rewrite_header.sw_if_index != sw_if_index0
+			    ?
+			    ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK
+			    : error0);
+		}
+	      else
+		{
+		  error0 = ICMP6_ERROR_ROUTER_SOLICITATION_SOURCE_NOT_ON_LINK;
+		}
+	    }
+
+	  /* check for source LL option and process */
+	  o0 = (void *) (h0 + 1);
+	  o0 = ((options_len0 == 8
+		 && o0->header.type == option_type
+		 && o0->header.n_data_u64s == 1) ? o0 : 0);
+
+	  /* if src address unspecified IGNORE any options */
+	  if (PREDICT_TRUE (error0 == ICMP6_ERROR_NONE && o0 != 0 &&
+			    !is_unspecified && !is_link_local))
+	    {
+	      ip_neighbor_learn_t learn = {
+		.type = IP46_TYPE_IP6,
+		.sw_if_index = sw_if_index0,
+		.ip.ip6 = ip0->src_address,
+	      };
+	      memcpy (&learn.mac, o0->ethernet_address, sizeof (learn.mac));
+	      ip_neighbor_learn_dp (&learn);
+	    }
+
+	  /* default is to drop */
+	  next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
+
+	  if (error0 == ICMP6_ERROR_NONE)
+	    {
+	      vnet_sw_interface_t *sw_if0;
+	      ethernet_interface_t *eth_if0;
+	      u32 adj_index0;
+
+	      sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
+	      ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
+	      eth_if0 =
+		ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
+
+	      /* only support ethernet interface type for now */
+	      error0 =
+		(!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
+		: error0;
+
+	      if (error0 == ICMP6_ERROR_NONE)
+		{
+		  /* adjust the sizeof the buffer to just include the ipv6 header */
+		  p0->current_length -=
+		    (options_len0 +
+		     sizeof (icmp6_neighbor_discovery_header_t));
+
+		  radv_info = ip6_ra_get_itf (sw_if_index0);
+
+		  error0 = ((!radv_info) ?
+			    ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
+			    error0);
+
+		  if (error0 == ICMP6_ERROR_NONE)
+		    {
+		      f64 now = vlib_time_now (vm);
+
+		      /* for solicited adverts - need to rate limit */
+		      if (is_solicitation)
+			{
+			  if (0 != radv_info->last_radv_time &&
+			      (now - radv_info->last_radv_time) <
+			      MIN_DELAY_BETWEEN_RAS)
+			    is_dropped = 1;
+			  else
+			    radv_info->last_radv_time = now;
+			}
+
+		      /* send now  */
+		      icmp6_router_advertisement_header_t rh;
+
+		      rh.icmp.type = ICMP6_router_advertisement;
+		      rh.icmp.code = 0;
+		      rh.icmp.checksum = 0;
+
+		      rh.current_hop_limit = radv_info->curr_hop_limit;
+		      rh.router_lifetime_in_sec =
+			clib_host_to_net_u16
+			(radv_info->adv_router_lifetime_in_sec);
+		      rh.
+			time_in_msec_between_retransmitted_neighbor_solicitations
+			=
+			clib_host_to_net_u32 (radv_info->
+					      adv_time_in_msec_between_retransmitted_neighbor_solicitations);
+		      rh.neighbor_reachable_time_in_msec =
+			clib_host_to_net_u32 (radv_info->
+					      adv_neighbor_reachable_time_in_msec);
+
+		      rh.flags =
+			(radv_info->adv_managed_flag) ?
+			ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP :
+			0;
+		      rh.flags |=
+			((radv_info->adv_other_flag) ?
+			 ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP :
+			 0);
+
+
+		      u16 payload_length =
+			sizeof (icmp6_router_advertisement_header_t);
+
+		      if (vlib_buffer_add_data
+			  (vm, &bi0, (void *) &rh,
+			   sizeof (icmp6_router_advertisement_header_t)))
+			{
+			  /* buffer allocation failed, drop the pkt */
+			  error0 = ICMP6_ERROR_ALLOC_FAILURE;
+			  goto drop0;
+			}
+
+		      if (radv_info->adv_link_layer_address)
+			{
+			  icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
+			    h;
+
+			  h.header.type =
+			    ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
+			  h.header.n_data_u64s = 1;
+
+			  /* copy ll address */
+			  clib_memcpy (&h.ethernet_address[0],
+				       eth_if0->address, 6);
+
+			  if (vlib_buffer_add_data
+			      (vm, &bi0, (void *) &h,
+			       sizeof
+			       (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t)))
+			    {
+			      error0 = ICMP6_ERROR_ALLOC_FAILURE;
+			      goto drop0;
+			    }
+
+			  payload_length +=
+			    sizeof
+			    (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t);
+			}
+
+		      /* add MTU option */
+		      if (radv_info->adv_link_mtu)
+			{
+			  icmp6_neighbor_discovery_mtu_option_t h;
+
+			  h.unused = 0;
+			  h.mtu =
+			    clib_host_to_net_u32 (radv_info->adv_link_mtu);
+			  h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu;
+			  h.header.n_data_u64s = 1;
+
+			  payload_length +=
+			    sizeof (icmp6_neighbor_discovery_mtu_option_t);
+
+			  if (vlib_buffer_add_data
+			      (vm, &bi0, (void *) &h,
+			       sizeof
+			       (icmp6_neighbor_discovery_mtu_option_t)))
+			    {
+			      error0 = ICMP6_ERROR_ALLOC_FAILURE;
+			      goto drop0;
+			    }
+			}
+
+		      /* add advertised prefix options  */
+		      ip6_radv_prefix_t *pr_info;
+
+		      /* *INDENT-OFF* */
+		      pool_foreach (pr_info, radv_info->adv_prefixes_pool,
+                      ({
+                        if(pr_info->enabled &&
+                           (!pr_info->decrement_lifetime_flag
+                            || (pr_info->pref_lifetime_expires >0)))
+                          {
+                            /* advertise this prefix */
+                            icmp6_neighbor_discovery_prefix_information_option_t h;
+
+                            h.header.type = ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information;
+                            h.header.n_data_u64s  =  (sizeof(icmp6_neighbor_discovery_prefix_information_option_t) >> 3);
+
+                            h.dst_address_length  = pr_info->prefix_len;
+
+                            h.flags  = (pr_info->adv_on_link_flag) ? ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_FLAG_ON_LINK : 0;
+                            h.flags |= (pr_info->adv_autonomous_flag) ?  ICMP6_NEIGHBOR_DISCOVERY_PREFIX_INFORMATION_AUTO :  0;
+
+                            if(radv_info->cease_radv && pr_info->deprecated_prefix_flag)
+                              {
+                                h.valid_time = clib_host_to_net_u32(MIN_ADV_VALID_LIFETIME);
+                                h.preferred_time  = 0;
+                              }
+                            else
+                              {
+                                if(pr_info->decrement_lifetime_flag)
+                                  {
+                                    pr_info->adv_valid_lifetime_in_secs = ((pr_info->valid_lifetime_expires  > now)) ?
+                                      (pr_info->valid_lifetime_expires  - now) : 0;
+
+                                    pr_info->adv_pref_lifetime_in_secs = ((pr_info->pref_lifetime_expires  > now)) ?
+                                      (pr_info->pref_lifetime_expires  - now) : 0;
+                                  }
+
+                                h.valid_time = clib_host_to_net_u32(pr_info->adv_valid_lifetime_in_secs);
+                                h.preferred_time  = clib_host_to_net_u32(pr_info->adv_pref_lifetime_in_secs) ;
+                              }
+                            h.unused  = 0;
+
+                            clib_warning ("Prefix %U valid %u preferred %u",
+                                          format_ip6_address, &pr_info->prefix,
+                                          clib_net_to_host_u32 (h.valid_time),
+                                          clib_net_to_host_u32 (h.preferred_time));
+
+                            if (h.valid_time == 0)
+                              clib_warning ("WARNING: valid_time 0!!!");
+
+                            clib_memcpy(&h.dst_address, &pr_info->prefix,  sizeof(ip6_address_t));
+
+                            payload_length += sizeof( icmp6_neighbor_discovery_prefix_information_option_t);
+
+                            if (vlib_buffer_add_data
+				(vm, &bi0, (void *)&h,
+				 sizeof(icmp6_neighbor_discovery_prefix_information_option_t)))
+                              {
+                                error0 = ICMP6_ERROR_ALLOC_FAILURE;
+                                goto drop0;
+                              }
+
+                          }
+                      }));
+		      /* *INDENT-ON* */
+
+		      /* add additional options before here */
+
+		      /* finish building the router advertisement... */
+		      if (!is_unspecified && radv_info->send_unicast)
+			{
+			  ip0->dst_address = ip0->src_address;
+			}
+		      else
+			{
+			  /* target address is all-nodes mcast addr */
+			  ip6_set_reserved_multicast_address
+			    (&ip0->dst_address,
+			     IP6_MULTICAST_SCOPE_link_local,
+			     IP6_MULTICAST_GROUP_ID_all_hosts);
+			}
+
+		      /* source address MUST be the link-local address */
+		      ip6_address_copy (&ip0->src_address,
+					ip6_get_link_local_address
+					(radv_info->sw_if_index));
+
+		      ip0->hop_limit = 255;
+		      ip0->payload_length =
+			clib_host_to_net_u16 (payload_length);
+
+		      icmp6_router_advertisement_header_t *rh0 =
+			(icmp6_router_advertisement_header_t *) (ip0 + 1);
+		      rh0->icmp.checksum =
+			ip6_tcp_udp_icmp_compute_checksum (vm, p0, ip0,
+							   &bogus_length);
+		      ASSERT (bogus_length == 0);
+
+		      /* setup output if and adjacency */
+		      vnet_buffer (p0)->sw_if_index[VLIB_RX] =
+			vnet_main.local_interface_sw_if_index;
+
+		      if (is_solicitation)
+			{
+			  ethernet_header_t *eth0;
+			  /* Reuse current MAC header, copy SMAC to DMAC and
+			   * interface MAC to SMAC */
+			  vlib_buffer_reset (p0);
+			  eth0 = vlib_buffer_get_current (p0);
+			  clib_memcpy (eth0->dst_address, eth0->src_address,
+				       6);
+			  clib_memcpy (eth0->src_address, eth_if0->address,
+				       6);
+			  next0 =
+			    is_dropped ? next0 :
+			    ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX;
+			  vnet_buffer (p0)->sw_if_index[VLIB_TX] =
+			    sw_if_index0;
+			}
+		      else
+			{
+			  adj_index0 = ip6_link_get_mcast_adj (sw_if_index0);
+			  if (adj_index0 == INDEX_INVALID)
+			    error0 = ICMP6_ERROR_DST_LOOKUP_MISS;
+			  else
+			    {
+			      next0 =
+				is_dropped ? next0 :
+				ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW;
+			      vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
+				adj_index0;
+			    }
+			}
+		      p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+
+		      radv_info->n_solicitations_dropped += is_dropped;
+		      radv_info->n_solicitations_rcvd += is_solicitation;
+
+		      if ((error0 == ICMP6_ERROR_NONE) && !is_dropped)
+			{
+			  radv_info->n_advertisements_sent++;
+			  n_advertisements_sent++;
+			}
+		    }
+		}
+	    }
+
+	drop0:
+	  p0->error = error_node->errors[error0];
+
+	  if (error0 != ICMP6_ERROR_NONE)
+	    vlib_error_count (vm, error_node->node_index, error0, 1);
+
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+					   to_next, n_left_to_next,
+					   bi0, next0);
+
+	}
+
+      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+    }
+
+  /* Account for router advertisements sent. */
+  vlib_error_count (vm, error_node->node_index,
+		    ICMP6_ERROR_ROUTER_ADVERTISEMENTS_TX,
+		    n_advertisements_sent);
+
+  return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip6_icmp_router_solicitation_node,static) =
+{
+  .function = icmp6_router_solicitation,
+  .name = "icmp6-router-solicitation",
+
+  .vector_size = sizeof (u32),
+
+  .format_trace = format_icmp6_input_trace,
+
+  .n_next_nodes = ICMP6_ROUTER_SOLICITATION_N_NEXT,
+  .next_nodes = {
+    [ICMP6_ROUTER_SOLICITATION_NEXT_DROP] = "ip6-drop",
+    [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_RW] = "ip6-rewrite-mcast",
+    [ICMP6_ROUTER_SOLICITATION_NEXT_REPLY_TX] = "interface-output",
+  },
+};
+/* *INDENT-ON* */
+
+ /* validate advertised info for consistancy (see RFC-4861 section 6.2.7) - log any inconsistencies, packet will always  be dropped  */
+static_always_inline uword
+icmp6_router_advertisement (vlib_main_t * vm,
+			    vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  uword n_packets = frame->n_vectors;
+  u32 *from, *to_next;
+  u32 n_left_from, n_left_to_next, next_index;
+  u32 n_advertisements_rcvd = 0;
+
+  vlib_node_runtime_t *error_node =
+    vlib_node_get_runtime (vm, ip6_icmp_input_node.index);
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = n_packets;
+  next_index = node->cached_next_index;
+
+  if (node->flags & VLIB_NODE_FLAG_TRACE)
+    vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
+				   /* stride */ 1,
+				   sizeof (icmp6_input_trace_t));
+
+  while (n_left_from > 0)
+    {
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  vlib_buffer_t *p0;
+	  ip6_header_t *ip0;
+	  ip6_ra_t *radv_info = 0;
+	  icmp6_router_advertisement_header_t *h0;
+	  u32 bi0, options_len0, sw_if_index0, next0, error0;
+
+	  bi0 = to_next[0] = from[0];
+
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+
+	  p0 = vlib_get_buffer (vm, bi0);
+	  ip0 = vlib_buffer_get_current (p0);
+	  h0 = ip6_next_header (ip0);
+	  options_len0 =
+	    clib_net_to_host_u16 (ip0->payload_length) - sizeof (h0[0]);
+
+	  error0 = ICMP6_ERROR_NONE;
+	  sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX];
+
+	  /* Check that source address is link-local */
+	  error0 = (!ip6_address_is_link_local_unicast (&ip0->src_address)) ?
+	    ICMP6_ERROR_ROUTER_ADVERTISEMENT_SOURCE_NOT_LINK_LOCAL : error0;
+
+	  /* default is to drop */
+	  next0 = ICMP6_ROUTER_SOLICITATION_NEXT_DROP;
+
+	  n_advertisements_rcvd++;
+
+	  if (error0 == ICMP6_ERROR_NONE)
+	    {
+	      vnet_sw_interface_t *sw_if0;
+	      ethernet_interface_t *eth_if0;
+
+	      sw_if0 = vnet_get_sup_sw_interface (vnm, sw_if_index0);
+	      ASSERT (sw_if0->type == VNET_SW_INTERFACE_TYPE_HARDWARE);
+	      eth_if0 =
+		ethernet_get_interface (&ethernet_main, sw_if0->hw_if_index);
+
+	      /* only support ethernet interface type for now */
+	      error0 =
+		(!eth_if0) ? ICMP6_ERROR_ROUTER_SOLICITATION_UNSUPPORTED_INTF
+		: error0;
+
+	      if (error0 == ICMP6_ERROR_NONE)
+		{
+		  /* look up the radv_t information for this interface */
+		  radv_info = ip6_ra_get_itf (sw_if_index0);
+
+		  error0 = ((!radv_info) ?
+			    ICMP6_ERROR_ROUTER_SOLICITATION_RADV_NOT_CONFIG :
+			    error0);
+
+		  if (error0 == ICMP6_ERROR_NONE)
+		    {
+		      radv_info->keep_sending_rs = 0;
+
+		      ip6_ra_report_t r;
+
+		      r.sw_if_index = sw_if_index0;
+		      memcpy (&r.router_address, &ip0->src_address, 16);
+		      r.current_hop_limit = h0->current_hop_limit;
+		      r.flags = h0->flags;
+		      r.router_lifetime_in_sec =
+			clib_net_to_host_u16 (h0->router_lifetime_in_sec);
+		      r.neighbor_reachable_time_in_msec =
+			clib_net_to_host_u32
+			(h0->neighbor_reachable_time_in_msec);
+		      r.time_in_msec_between_retransmitted_neighbor_solicitations = clib_net_to_host_u32 (h0->time_in_msec_between_retransmitted_neighbor_solicitations);
+		      r.prefixes = 0;
+
+		      /* validate advertised information */
+		      if ((h0->current_hop_limit && radv_info->curr_hop_limit)
+			  && (h0->current_hop_limit !=
+			      radv_info->curr_hop_limit))
+			{
+			  ip6_neighbor_syslog (vm, LOG_WARNING,
+					       "our AdvCurHopLimit on %U doesn't agree with %U",
+					       format_vnet_sw_if_index_name,
+					       vnm, sw_if_index0,
+					       format_ip6_address,
+					       &ip0->src_address);
+			}
+
+		      if ((h0->flags &
+			   ICMP6_ROUTER_DISCOVERY_FLAG_ADDRESS_CONFIG_VIA_DHCP)
+			  != radv_info->adv_managed_flag)
+			{
+			  ip6_neighbor_syslog (vm, LOG_WARNING,
+					       "our AdvManagedFlag on %U doesn't agree with %U",
+					       format_vnet_sw_if_index_name,
+					       vnm, sw_if_index0,
+					       format_ip6_address,
+					       &ip0->src_address);
+			}
+
+		      if ((h0->flags &
+			   ICMP6_ROUTER_DISCOVERY_FLAG_OTHER_CONFIG_VIA_DHCP)
+			  != radv_info->adv_other_flag)
+			{
+			  ip6_neighbor_syslog (vm, LOG_WARNING,
+					       "our AdvOtherConfigFlag on %U doesn't agree with %U",
+					       format_vnet_sw_if_index_name,
+					       vnm, sw_if_index0,
+					       format_ip6_address,
+					       &ip0->src_address);
+			}
+
+		      if ((h0->
+			   time_in_msec_between_retransmitted_neighbor_solicitations
+			   && radv_info->
+			   adv_time_in_msec_between_retransmitted_neighbor_solicitations)
+			  && (h0->
+			      time_in_msec_between_retransmitted_neighbor_solicitations
+			      !=
+			      clib_host_to_net_u32 (radv_info->
+						    adv_time_in_msec_between_retransmitted_neighbor_solicitations)))
+			{
+			  ip6_neighbor_syslog (vm, LOG_WARNING,
+					       "our AdvRetransTimer on %U doesn't agree with %U",
+					       format_vnet_sw_if_index_name,
+					       vnm, sw_if_index0,
+					       format_ip6_address,
+					       &ip0->src_address);
+			}
+
+		      if ((h0->neighbor_reachable_time_in_msec &&
+			   radv_info->adv_neighbor_reachable_time_in_msec) &&
+			  (h0->neighbor_reachable_time_in_msec !=
+			   clib_host_to_net_u32
+			   (radv_info->adv_neighbor_reachable_time_in_msec)))
+			{
+			  ip6_neighbor_syslog (vm, LOG_WARNING,
+					       "our AdvReachableTime on %U doesn't agree with %U",
+					       format_vnet_sw_if_index_name,
+					       vnm, sw_if_index0,
+					       format_ip6_address,
+					       &ip0->src_address);
+			}
+
+		      /* check for MTU or prefix options or .. */
+		      u8 *opt_hdr = (u8 *) (h0 + 1);
+		      while (options_len0 > 0)
+			{
+			  icmp6_neighbor_discovery_option_header_t *o0 =
+			    (icmp6_neighbor_discovery_option_header_t *)
+			    opt_hdr;
+			  int opt_len = o0->n_data_u64s << 3;
+			  icmp6_neighbor_discovery_option_type_t option_type =
+			    o0->type;
+
+			  if (options_len0 < 2)
+			    {
+			      ip6_neighbor_syslog (vm, LOG_ERR,
+						   "malformed RA packet on %U from %U",
+						   format_vnet_sw_if_index_name,
+						   vnm, sw_if_index0,
+						   format_ip6_address,
+						   &ip0->src_address);
+			      break;
+			    }
+
+			  if (opt_len == 0)
+			    {
+			      ip6_neighbor_syslog (vm, LOG_ERR,
+						   " zero length option in RA on %U from %U",
+						   format_vnet_sw_if_index_name,
+						   vnm, sw_if_index0,
+						   format_ip6_address,
+						   &ip0->src_address);
+			      break;
+			    }
+			  else if (opt_len > options_len0)
+			    {
+			      ip6_neighbor_syslog (vm, LOG_ERR,
+						   "option length in RA packet  greater than total length on %U from %U",
+						   format_vnet_sw_if_index_name,
+						   vnm, sw_if_index0,
+						   format_ip6_address,
+						   &ip0->src_address);
+			      break;
+			    }
+
+			  options_len0 -= opt_len;
+			  opt_hdr += opt_len;
+
+			  switch (option_type)
+			    {
+			    case ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address:
+			      {
+				icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
+				  * h =
+				  (icmp6_neighbor_discovery_ethernet_link_layer_address_option_t
+				   *) (o0);
+
+				if (opt_len < sizeof (*h))
+				  break;
+
+				memcpy (r.slla, h->ethernet_address, 6);
+			      }
+			      break;
+
+			    case ICMP6_NEIGHBOR_DISCOVERY_OPTION_mtu:
+			      {
+				icmp6_neighbor_discovery_mtu_option_t *h =
+				  (icmp6_neighbor_discovery_mtu_option_t
+				   *) (o0);
+
+				if (opt_len < sizeof (*h))
+				  break;
+
+				r.mtu = clib_net_to_host_u32 (h->mtu);
+
+				if ((h->mtu && radv_info->adv_link_mtu) &&
+				    (h->mtu !=
+				     clib_host_to_net_u32
+				     (radv_info->adv_link_mtu)))
+				  {
+				    ip6_neighbor_syslog (vm, LOG_WARNING,
+							 "our AdvLinkMTU on %U doesn't agree with %U",
+							 format_vnet_sw_if_index_name,
+							 vnm, sw_if_index0,
+							 format_ip6_address,
+							 &ip0->src_address);
+				  }
+			      }
+			      break;
+
+			    case ICMP6_NEIGHBOR_DISCOVERY_OPTION_prefix_information:
+			      {
+				icmp6_neighbor_discovery_prefix_information_option_t
+				  * h =
+				  (icmp6_neighbor_discovery_prefix_information_option_t
+				   *) (o0);
+
+				/* validate advertised prefix options  */
+				ip6_radv_prefix_t *pr_info;
+				u32 preferred, valid;
+
+				if (opt_len < sizeof (*h))
+				  break;
+
+				vec_validate (r.prefixes,
+					      vec_len (r.prefixes));
+				ra_report_prefix_info_t *prefix =
+				  vec_elt_at_index (r.prefixes,
+						    vec_len (r.prefixes) - 1);
+
+				preferred =
+				  clib_net_to_host_u32 (h->preferred_time);
+				valid = clib_net_to_host_u32 (h->valid_time);
+
+				prefix->preferred_time = preferred;
+				prefix->valid_time = valid;
+				prefix->flags = h->flags & 0xc0;
+				prefix->prefix.fp_len = h->dst_address_length;
+				prefix->prefix.fp_addr.ip6 = h->dst_address;
+				prefix->prefix.fp_proto = FIB_PROTOCOL_IP6;
+
+				/* look for matching prefix - if we our advertising it, it better be consistant */
+				/* *INDENT-OFF* */
+				pool_foreach (pr_info, radv_info->adv_prefixes_pool,
+                                ({
+
+                                  ip6_address_t mask;
+                                  ip6_address_mask_from_width(&mask, pr_info->prefix_len);
+
+                                  if(pr_info->enabled &&
+                                     (pr_info->prefix_len == h->dst_address_length) &&
+                                     ip6_address_is_equal_masked (&pr_info->prefix,  &h->dst_address, &mask))
+                                    {
+                                      /* found it */
+                                      if(!pr_info->decrement_lifetime_flag &&
+                                         valid != pr_info->adv_valid_lifetime_in_secs)
+                                        {
+                                          ip6_neighbor_syslog(vm,  LOG_WARNING,
+                                                              "our ADV validlifetime on  %U for %U does not  agree with %U",
+                                                              format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
+                                                              format_ip6_address, &h->dst_address);
+                                        }
+                                      if(!pr_info->decrement_lifetime_flag &&
+                                         preferred != pr_info->adv_pref_lifetime_in_secs)
+                                        {
+                                          ip6_neighbor_syslog(vm,  LOG_WARNING,
+                                                              "our ADV preferredlifetime on  %U for %U does not  agree with %U",
+                                                              format_vnet_sw_if_index_name, vnm, sw_if_index0,format_ip6_address, &pr_info->prefix,
+                                                              format_ip6_address, &h->dst_address);
+                                        }
+                                    }
+                                  break;
+                                }));
+				/* *INDENT-ON* */
+				break;
+			      }
+			    default:
+			      /* skip this one */
+			      break;
+			    }
+			}
+		      ip6_ra_publish (&r);
+		    }
+		}
+	    }
+
+	  p0->error = error_node->errors[error0];
+
+	  if (error0 != ICMP6_ERROR_NONE)
+	    vlib_error_count (vm, error_node->node_index, error0, 1);
+
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+					   to_next, n_left_to_next,
+					   bi0, next0);
+	}
+
+      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+    }
+
+  /* Account for router advertisements received. */
+  vlib_error_count (vm, error_node->node_index,
+		    ICMP6_ERROR_ROUTER_ADVERTISEMENTS_RX,
+		    n_advertisements_rcvd);
+
+  return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip6_icmp_router_advertisement_node,static) =
+{
+  .function = icmp6_router_advertisement,
+  .name = "icmp6-router-advertisement",
+
+  .vector_size = sizeof (u32),
+
+  .format_trace = format_icmp6_input_trace,
+
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [0] = "ip6-drop",
+  },
+};
+/* *INDENT-ON* */
+
+static inline f64
+random_f64_from_to (f64 from, f64 to)
+{
+  static u32 seed = 0;
+  static u8 seed_set = 0;
+  if (!seed_set)
+    {
+      seed = random_default_seed ();
+      seed_set = 1;
+    }
+  return random_f64 (&seed) * (to - from) + from;
+}
+
+static inline u8
+get_mac_address (u32 sw_if_index, u8 * address)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  vnet_hw_interface_t *hw_if = vnet_get_sup_hw_interface (vnm, sw_if_index);
+  if (!hw_if->hw_address)
+    return 1;
+  clib_memcpy (address, hw_if->hw_address, 6);
+  return 0;
+}
+
+static inline vlib_buffer_t *
+create_buffer_for_rs (vlib_main_t * vm, ip6_ra_t * radv_info)
+{
+  u32 bi0;
+  vlib_buffer_t *p0;
+  icmp6_router_solicitation_header_t *rh;
+  u16 payload_length;
+  int bogus_length;
+  u32 sw_if_index;
+
+  sw_if_index = radv_info->sw_if_index;
+
+  if (vlib_buffer_alloc (vm, &bi0, 1) != 1)
+    {
+      clib_warning ("buffer allocation failure");
+      return 0;
+    }
+
+  p0 = vlib_get_buffer (vm, bi0);
+  VLIB_BUFFER_TRACE_TRAJECTORY_INIT (p0);
+  p0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+
+  vnet_buffer (p0)->sw_if_index[VLIB_RX] = sw_if_index;
+  vnet_buffer (p0)->sw_if_index[VLIB_TX] = sw_if_index;
+
+  vnet_buffer (p0)->ip.adj_index[VLIB_TX] =
+    ip6_link_get_mcast_adj (sw_if_index);
+
+  rh = vlib_buffer_get_current (p0);
+  p0->current_length = sizeof (*rh);
+
+  rh->neighbor.icmp.type = ICMP6_router_solicitation;
+  rh->neighbor.icmp.code = 0;
+  rh->neighbor.icmp.checksum = 0;
+  rh->neighbor.reserved_must_be_zero = 0;
+
+  rh->link_layer_option.header.type =
+    ICMP6_NEIGHBOR_DISCOVERY_OPTION_source_link_layer_address;
+  if (0 != get_mac_address (sw_if_index,
+			    rh->link_layer_option.ethernet_address))
+    {
+      clib_warning ("interface with sw_if_index %u has no mac address",
+		    sw_if_index);
+      vlib_buffer_free (vm, &bi0, 1);
+      return 0;
+    }
+  rh->link_layer_option.header.n_data_u64s = 1;
+
+  payload_length = sizeof (rh->neighbor) + sizeof (u64);
+
+  rh->ip.ip_version_traffic_class_and_flow_label =
+    clib_host_to_net_u32 (0x6 << 28);
+  rh->ip.payload_length = clib_host_to_net_u16 (payload_length);
+  rh->ip.protocol = IP_PROTOCOL_ICMP6;
+  rh->ip.hop_limit = 255;
+  ip6_address_copy (&rh->ip.src_address,
+		    ip6_get_link_local_address (radv_info->sw_if_index));
+  /* set address ff02::2 */
+  rh->ip.dst_address.as_u64[0] = clib_host_to_net_u64 (0xff02ULL << 48);
+  rh->ip.dst_address.as_u64[1] = clib_host_to_net_u64 (2);
+
+  rh->neighbor.icmp.checksum = ip6_tcp_udp_icmp_compute_checksum (vm, p0,
+								  &rh->ip,
+								  &bogus_length);
+
+  return p0;
+}
+
+static inline void
+stop_sending_rs (vlib_main_t * vm, ip6_ra_t * ra)
+{
+  u32 bi0;
+
+  ra->keep_sending_rs = 0;
+  if (ra->buffer)
+    {
+      bi0 = vlib_get_buffer_index (vm, ra->buffer);
+      vlib_buffer_free (vm, &bi0, 1);
+      ra->buffer = 0;
+    }
+}
+
+static inline bool
+check_send_rs (vlib_main_t * vm, ip6_ra_t * radv_info, f64 current_time,
+	       f64 * due_time)
+{
+  vlib_buffer_t *p0;
+  vlib_frame_t *f;
+  u32 *to_next;
+  u32 next_index;
+  vlib_buffer_t *c0;
+  u32 ci0;
+
+  icmp6_send_router_solicitation_params_t *params;
+
+  if (!radv_info->keep_sending_rs)
+    return false;
+
+  params = &radv_info->params;
+
+  if (radv_info->due_time > current_time)
+    {
+      *due_time = radv_info->due_time;
+      return true;
+    }
+
+  p0 = radv_info->buffer;
+
+  next_index = ip6_rewrite_mcast_node.index;
+
+  c0 = vlib_buffer_copy (vm, p0);
+  ci0 = vlib_get_buffer_index (vm, c0);
+
+  f = vlib_get_frame_to_node (vm, next_index);
+  to_next = vlib_frame_vector_args (f);
+  to_next[0] = ci0;
+  f->n_vectors = 1;
+  vlib_put_frame_to_node (vm, next_index, f);
+
+  if (params->mrc != 0 && --radv_info->n_left == 0)
+    stop_sending_rs (vm, radv_info);
+  else
+    {
+      radv_info->sleep_interval =
+	(2 + random_f64_from_to (-0.1, 0.1)) * radv_info->sleep_interval;
+      if (radv_info->sleep_interval > params->mrt)
+	radv_info->sleep_interval =
+	  (1 + random_f64_from_to (-0.1, 0.1)) * params->mrt;
+
+      radv_info->due_time = current_time + radv_info->sleep_interval;
+
+      if (params->mrd != 0
+	  && current_time > radv_info->start_time + params->mrd)
+	stop_sending_rs (vm, radv_info);
+      else
+	*due_time = radv_info->due_time;
+    }
+
+  return radv_info->keep_sending_rs;
+}
+
+static uword
+send_rs_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
+		 vlib_frame_t * f0)
+{
+  uword *event_data = NULL;
+  f64 sleep_time = 1e9;
+  ip6_ra_t *radv_info;
+  f64 current_time;
+  f64 due_time;
+  f64 dt = 0;
+
+  while (true)
+    {
+      vlib_process_wait_for_event_or_clock (vm, sleep_time);
+      vlib_process_get_events (vm, &event_data);
+      vec_reset_length (event_data);
+
+      current_time = vlib_time_now (vm);
+      do
+	{
+	  due_time = current_time + 1e9;
+        /* *INDENT-OFF* */
+        pool_foreach (radv_info, ip6_ra_pool,
+        ({
+	    if (check_send_rs (vm, radv_info, current_time, &dt)
+		&& (dt < due_time))
+	      due_time = dt;
+        }));
+        /* *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 (ip6_rs_process_node) = {
+    .function = send_rs_process,
+    .type = VLIB_NODE_TYPE_PROCESS,
+    .name = "ip6-rs-process",
+};
+/* *INDENT-ON* */
+
+void
+icmp6_send_router_solicitation (vlib_main_t * vm, u32 sw_if_index, u8 stop,
+				const icmp6_send_router_solicitation_params_t
+				* params)
+{
+  ip6_ra_t *ra;
+
+  ASSERT (~0 != sw_if_index);
+
+  ra = ip6_ra_get_itf (sw_if_index);
+
+  if (!ra)
+    return;
+
+  stop_sending_rs (vm, ra);
+
+  if (!stop)
+    {
+      ra->keep_sending_rs = 1;
+      ra->params = *params;
+      ra->n_left = params->mrc;
+      ra->start_time = vlib_time_now (vm);
+      ra->sleep_interval = (1 + random_f64_from_to (-0.1, 0.1)) * params->irt;
+      ra->due_time = 0;		/* send first packet ASAP */
+      ra->buffer = create_buffer_for_rs (vm, ra);
+      if (!ra->buffer)
+	ra->keep_sending_rs = 0;
+      else
+	vlib_process_signal_event (vm, ip6_rs_process_node.index, 1, 0);
+    }
+}
+
+static const ethernet_interface_t *
+ip6_ra_get_eth_itf (u32 sw_if_index)
+{
+  const vnet_sw_interface_t *sw;
+
+  /* lookup radv container  - ethernet interfaces only */
+  sw = vnet_get_sup_sw_interface (vnet_get_main (), sw_if_index);
+  if (sw->type == VNET_SW_INTERFACE_TYPE_HARDWARE)
+    return (ethernet_get_interface (&ethernet_main, sw->hw_if_index));
+
+  return (NULL);
+}
+
+/**
+ * @brief called when IP6 is enabled on an interface
+ *create and initialize router advertisement parameters with default
+ * values for this intfc
+ */
+static void
+ip6_ra_link_enable (u32 sw_if_index)
+{
+  const ethernet_interface_t *eth;
+  ip6_ra_t *radv_info;
+
+  eth = ip6_ra_get_eth_itf (sw_if_index);
+
+  if (NULL == eth)
+    return;
+
+  ASSERT (INDEX_INVALID == ip6_link_delegate_get (sw_if_index,
+						  ip6_ra_delegate_id));
+
+  pool_get_zero (ip6_ra_pool, radv_info);
+
+  radv_info->seed = (u32) clib_cpu_time_now ();
+  random_u32 (&radv_info->seed);
+
+  radv_info->sw_if_index = sw_if_index;
+  radv_info->max_radv_interval = DEF_MAX_RADV_INTERVAL;
+  radv_info->min_radv_interval = DEF_MIN_RADV_INTERVAL;
+  radv_info->curr_hop_limit = DEF_CURR_HOP_LIMIT;
+  radv_info->adv_router_lifetime_in_sec = DEF_DEF_RTR_LIFETIME;
+
+  /* send ll address source address option */
+  radv_info->adv_link_layer_address = 1;
+
+  radv_info->min_delay_between_radv = MIN_DELAY_BETWEEN_RAS;
+  radv_info->max_delay_between_radv = MAX_DELAY_BETWEEN_RAS;
+  radv_info->max_rtr_default_lifetime = MAX_DEF_RTR_LIFETIME;
+
+  radv_info->initial_adverts_count = MAX_INITIAL_RTR_ADVERTISEMENTS;
+  radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
+  radv_info->initial_adverts_interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
+
+  /* deafult is to send */
+  radv_info->send_radv = 1;
+
+  /* fill in delegate for this interface that will be needed later */
+  radv_info->adv_link_mtu =
+    vnet_sw_interface_get_mtu (vnet_get_main (), sw_if_index, VNET_MTU_IP6);
+
+  mhash_init (&radv_info->address_to_prefix_index, sizeof (uword),
+	      sizeof (ip6_address_t));
+
+  ip6_link_delegate_update (sw_if_index, ip6_ra_delegate_id,
+			    radv_info - ip6_ra_pool);
+}
+
+static void
+ip6_ra_delegate_disable (index_t rai)
+{
+  ip6_radv_prefix_t *p;
+  ip6_ra_t *radv_info;
+
+  radv_info = pool_elt_at_index (ip6_ra_pool, rai);
+
+  /* clean up prefix and MDP pools */
+  /* *INDENT-OFF* */
+  pool_flush(p, radv_info->adv_prefixes_pool,
+  ({
+    mhash_unset (&radv_info->address_to_prefix_index, &p->prefix, 0);
+  }));
+  /* *INDENT-ON* */
+
+  pool_free (radv_info->adv_prefixes_pool);
+
+  mhash_free (&radv_info->address_to_prefix_index);
+
+  pool_put (ip6_ra_pool, radv_info);
+}
+
+/* send a RA or update the timer info etc.. */
+static uword
+ip6_ra_process_timer_event (vlib_main_t * vm,
+			    vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  ip6_ra_t *radv_info;
+  vlib_frame_t *f = 0;
+  u32 n_this_frame = 0;
+  u32 n_left_to_next = 0;
+  u32 *to_next = 0;
+  u32 bo0;
+  icmp6_router_solicitation_header_t *h0;
+  vlib_buffer_t *b0;
+  f64 now = vlib_time_now (vm);
+
+  /* Interface ip6 radv info list */
+  /* *INDENT-OFF* */
+  pool_foreach (radv_info, ip6_ra_pool,
+  ({
+    if( !vnet_sw_interface_is_admin_up (vnm, radv_info->sw_if_index))
+      {
+        radv_info->initial_adverts_sent = radv_info->initial_adverts_count-1;
+        radv_info->next_multicast_time = now;
+        radv_info->last_multicast_time = now;
+        radv_info->last_radv_time = 0;
+        continue;
+      }
+
+    /* is it time to send a multicast  RA on this interface? */
+    if(radv_info->send_radv && (now >=  radv_info->next_multicast_time))
+      {
+        u32 n_to_alloc = 1;
+        u32 n_allocated;
+
+        f64 rfn = (radv_info->max_radv_interval - radv_info->min_radv_interval) *
+          random_f64 (&radv_info->seed) + radv_info->min_radv_interval;
+
+        /* multicast send - compute next multicast send time */
+        if( radv_info->initial_adverts_sent > 0)
+          {
+            radv_info->initial_adverts_sent--;
+            if(rfn > radv_info->initial_adverts_interval)
+              rfn =  radv_info->initial_adverts_interval;
+
+            /* check to see if we are ceasing to send */
+            if( radv_info->initial_adverts_sent  == 0)
+              if(radv_info->cease_radv)
+                radv_info->send_radv = 0;
+          }
+
+        radv_info->next_multicast_time =  rfn + now;
+        radv_info->last_multicast_time = now;
+
+        /* send advert now - build a "solicted" router advert with unspecified source address */
+        n_allocated = vlib_buffer_alloc (vm, &bo0, n_to_alloc);
+
+        if (PREDICT_FALSE(n_allocated == 0))
+          {
+            clib_warning ("buffer allocation failure");
+            continue;
+          }
+        b0 = vlib_get_buffer (vm, bo0);
+        b0->current_length = sizeof( icmp6_router_solicitation_header_t);
+        b0->error = ICMP6_ERROR_NONE;
+        vnet_buffer (b0)->sw_if_index[VLIB_RX] = radv_info->sw_if_index;
+
+        h0 =  vlib_buffer_get_current (b0);
+
+        clib_memset (h0, 0, sizeof (icmp6_router_solicitation_header_t));
+
+        h0->ip.ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 (0x6 << 28);
+        h0->ip.payload_length = clib_host_to_net_u16 (sizeof (icmp6_router_solicitation_header_t)
+                                                      - STRUCT_OFFSET_OF (icmp6_router_solicitation_header_t, neighbor));
+        h0->ip.protocol = IP_PROTOCOL_ICMP6;
+        h0->ip.hop_limit = 255;
+
+        /* set src/dst address as "unspecified" this marks this packet as internally generated rather than recieved */
+        h0->ip.src_address.as_u64[0] = 0;
+        h0->ip.src_address.as_u64[1] = 0;
+
+        h0->ip.dst_address.as_u64[0] = 0;
+        h0->ip.dst_address.as_u64[1] = 0;
+
+        h0->neighbor.icmp.type = ICMP6_router_solicitation;
+
+        if (PREDICT_FALSE(f == 0))
+          {
+            f = vlib_get_frame_to_node (vm, ip6_icmp_router_solicitation_node.index);
+            to_next = vlib_frame_vector_args (f);
+            n_left_to_next = VLIB_FRAME_SIZE;
+            n_this_frame = 0;
+          }
+
+        n_this_frame++;
+        n_left_to_next--;
+        to_next[0] = bo0;
+        to_next += 1;
+
+        if (PREDICT_FALSE(n_left_to_next == 0))
+          {
+            f->n_vectors = n_this_frame;
+            vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
+            f = 0;
+          }
+      }
+  }));
+  /* *INDENT-ON* */
+
+  if (f)
+    {
+      ASSERT (n_this_frame);
+      f->n_vectors = n_this_frame;
+      vlib_put_frame_to_node (vm, ip6_icmp_router_solicitation_node.index, f);
+    }
+  return 0;
+}
+
+static void
+ip6_ra_handle_report (const ip6_ra_report_t * rap)
+{
+  u32 ii;
+
+  vec_foreach_index (ii, ip6_ra_listeners) ip6_ra_listeners[ii] (rap);
+}
+
+static uword
+ip6_ra_event_process (vlib_main_t * vm,
+		      vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  ip6_ra_report_t *r, *rs;
+  uword event_type;
+
+  /* init code here */
+
+  while (1)
+    {
+      vlib_process_wait_for_event_or_clock (vm, 1. /* seconds */ );
+
+      rs = vlib_process_get_event_data (vm, &event_type);
+
+      if (NULL == rs)
+	{
+	  /* No events found: timer expired. */
+	  /* process interface list and send RAs as appropriate, update timer info */
+	  ip6_ra_process_timer_event (vm, node, frame);
+	}
+      else
+	{
+	  vec_foreach (r, rs) ip6_ra_handle_report (r);
+	  vec_reset_length (rs);
+	}
+    }
+  return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (ip6_ra_process_node) =
+{
+.function = ip6_ra_event_process,.name = "ip6-ra-process",.type =
+    VLIB_NODE_TYPE_PROCESS,};
+
+static void
+ip6_ra_signal_report (ip6_ra_report_t * r)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  ip6_ra_report_t *q;
+
+  if (!vec_len (ip6_ra_listeners))
+    return;
+
+  q = vlib_process_signal_event_data (vm,
+				      ip6_ra_process_node.index,
+				      0, 1, sizeof *q);
+  *q = *r;
+}
+
+static int
+ip6_ra_publish (ip6_ra_report_t * r)
+{
+  void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
+  vl_api_rpc_call_main_thread (ip6_ra_signal_report, (u8 *) r, sizeof *r);
+  return 0;
+}
+
+/* API support functions */
+int
+ip6_ra_config (vlib_main_t * vm, u32 sw_if_index,
+	       u8 suppress, u8 managed, u8 other,
+	       u8 ll_option, u8 send_unicast, u8 cease,
+	       u8 use_lifetime, u32 lifetime,
+	       u32 initial_count, u32 initial_interval,
+	       u32 max_interval, u32 min_interval, u8 is_no)
+{
+  ip6_ra_t *radv_info;
+
+  /* look up the radv_t  information for this interface */
+  radv_info = ip6_ra_get_itf (sw_if_index);
+
+  if (!radv_info)
+    return (VNET_API_ERROR_IP6_NOT_ENABLED);
+
+  if ((max_interval != 0) && (min_interval == 0))
+    min_interval = .75 * max_interval;
+
+  max_interval =
+    (max_interval !=
+     0) ? ((is_no) ? DEF_MAX_RADV_INTERVAL : max_interval) :
+    radv_info->max_radv_interval;
+  min_interval =
+    (min_interval !=
+     0) ? ((is_no) ? DEF_MIN_RADV_INTERVAL : min_interval) :
+    radv_info->min_radv_interval;
+  lifetime =
+    (use_lifetime !=
+     0) ? ((is_no) ? DEF_DEF_RTR_LIFETIME : lifetime) :
+    radv_info->adv_router_lifetime_in_sec;
+
+  if (lifetime)
+    {
+      if (lifetime > MAX_DEF_RTR_LIFETIME)
+	lifetime = MAX_DEF_RTR_LIFETIME;
+
+      if (lifetime <= max_interval)
+	return VNET_API_ERROR_INVALID_VALUE;
+    }
+
+  if (min_interval != 0)
+    {
+      if ((min_interval > .75 * max_interval) || (min_interval < 3))
+	return VNET_API_ERROR_INVALID_VALUE;
+    }
+
+  if ((initial_count > MAX_INITIAL_RTR_ADVERTISEMENTS) ||
+      (initial_interval > MAX_INITIAL_RTR_ADVERT_INTERVAL))
+    return VNET_API_ERROR_INVALID_VALUE;
+
+  /*
+     if "flag" is set and is_no is true then restore default value else set value corresponding to "flag"
+     if "flag" is clear  don't change corresponding value
+   */
+  radv_info->send_radv =
+    (suppress != 0) ? ((is_no != 0) ? 1 : 0) : radv_info->send_radv;
+  radv_info->adv_managed_flag =
+    (managed != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_managed_flag;
+  radv_info->adv_other_flag =
+    (other != 0) ? ((is_no) ? 0 : 1) : radv_info->adv_other_flag;
+  radv_info->adv_link_layer_address =
+    (ll_option != 0) ? ((is_no) ? 1 : 0) : radv_info->adv_link_layer_address;
+  radv_info->send_unicast =
+    (send_unicast != 0) ? ((is_no) ? 0 : 1) : radv_info->send_unicast;
+  radv_info->cease_radv =
+    (cease != 0) ? ((is_no) ? 0 : 1) : radv_info->cease_radv;
+
+  radv_info->min_radv_interval = min_interval;
+  radv_info->max_radv_interval = max_interval;
+  radv_info->adv_router_lifetime_in_sec = lifetime;
+
+  radv_info->initial_adverts_count =
+    (initial_count !=
+     0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERTISEMENTS : initial_count) :
+    radv_info->initial_adverts_count;
+  radv_info->initial_adverts_interval =
+    (initial_interval !=
+     0) ? ((is_no) ? MAX_INITIAL_RTR_ADVERT_INTERVAL : initial_interval) :
+    radv_info->initial_adverts_interval;
+
+  /* restart */
+  if ((cease != 0) && (is_no))
+    radv_info->send_radv = 1;
+
+  radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
+  radv_info->next_multicast_time = vlib_time_now (vm);
+  radv_info->last_multicast_time = vlib_time_now (vm);
+  radv_info->last_radv_time = 0;
+
+  return (0);
+}
+
+
+int
+ip6_ra_prefix (vlib_main_t * vm, u32 sw_if_index,
+	       ip6_address_t * prefix_addr, u8 prefix_len,
+	       u8 use_default, u32 val_lifetime, u32 pref_lifetime,
+	       u8 no_advertise, u8 off_link, u8 no_autoconfig,
+	       u8 no_onlink, u8 is_no)
+{
+  ip6_ra_t *radv_info;
+
+  /* look up the radv_t  information for this interface */
+  radv_info = ip6_ra_get_itf (sw_if_index);
+
+  if (!radv_info)
+    return (VNET_API_ERROR_IP6_NOT_ENABLED);
+
+  f64 now = vlib_time_now (vm);
+
+  /* prefix info add, delete or update */
+  ip6_radv_prefix_t *prefix;
+
+  /* lookup  prefix info for this  address on this interface */
+  uword *p = mhash_get (&radv_info->address_to_prefix_index, prefix_addr);
+
+  prefix = p ? pool_elt_at_index (radv_info->adv_prefixes_pool, p[0]) : 0;
+
+  if (is_no)
+    {
+      /* delete */
+      if (!prefix)
+	return VNET_API_ERROR_INVALID_VALUE;	/* invalid prefix */
+
+      if (prefix->prefix_len != prefix_len)
+	return VNET_API_ERROR_INVALID_VALUE_2;
+
+      /* FIXME - Should the DP do this or the CP ? */
+      /* do specific delete processing here before returning */
+      /* try to remove from routing table */
+
+      mhash_unset (&radv_info->address_to_prefix_index, prefix_addr,
+		   /* old_value */ 0);
+      pool_put (radv_info->adv_prefixes_pool, prefix);
+
+      radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
+      radv_info->next_multicast_time = vlib_time_now (vm);
+      radv_info->last_multicast_time = vlib_time_now (vm);
+      radv_info->last_radv_time = 0;
+      return (0);
+    }
+
+  /* adding or changing */
+  if (!prefix)
+    {
+      /* add */
+      u32 pi;
+      pool_get_zero (radv_info->adv_prefixes_pool, prefix);
+      pi = prefix - radv_info->adv_prefixes_pool;
+      mhash_set (&radv_info->address_to_prefix_index, prefix_addr, pi,
+		 /* old_value */ 0);
+
+      clib_memset (prefix, 0x0, sizeof (ip6_radv_prefix_t));
+
+      prefix->prefix_len = prefix_len;
+      clib_memcpy (&prefix->prefix, prefix_addr, sizeof (ip6_address_t));
+
+      /* initialize default values */
+      prefix->adv_on_link_flag = 1;	/* L bit set */
+      prefix->adv_autonomous_flag = 1;	/* A bit set */
+      prefix->adv_valid_lifetime_in_secs = DEF_ADV_VALID_LIFETIME;
+      prefix->adv_pref_lifetime_in_secs = DEF_ADV_PREF_LIFETIME;
+      prefix->enabled = 1;
+      prefix->decrement_lifetime_flag = 1;
+      prefix->deprecated_prefix_flag = 1;
+
+      if (off_link == 0)
+	{
+	  /* FIXME - Should the DP do this or the CP ? */
+	  /* insert prefix into routing table as a connected prefix */
+	}
+
+      if (use_default)
+	goto restart;
+    }
+  else
+    {
+
+      if (prefix->prefix_len != prefix_len)
+	return VNET_API_ERROR_INVALID_VALUE_2;
+
+      if (off_link != 0)
+	{
+	  /* FIXME - Should the DP do this or the CP ? */
+	  /* remove from routing table if already there */
+	}
+    }
+
+  if ((val_lifetime == ~0) || (pref_lifetime == ~0))
+    {
+      prefix->adv_valid_lifetime_in_secs = ~0;
+      prefix->adv_pref_lifetime_in_secs = ~0;
+      prefix->decrement_lifetime_flag = 0;
+    }
+  else
+    {
+      prefix->adv_valid_lifetime_in_secs = val_lifetime;;
+      prefix->adv_pref_lifetime_in_secs = pref_lifetime;
+    }
+
+  /* copy  remaining */
+  prefix->enabled = !(no_advertise != 0);
+  prefix->adv_on_link_flag = !((off_link != 0) || (no_onlink != 0));
+  prefix->adv_autonomous_flag = !(no_autoconfig != 0);
+
+restart:
+  /* restart */
+  /* fill in the expiration times  */
+  prefix->valid_lifetime_expires = now + prefix->adv_valid_lifetime_in_secs;
+  prefix->pref_lifetime_expires = now + prefix->adv_pref_lifetime_in_secs;
+
+  radv_info->initial_adverts_sent = radv_info->initial_adverts_count - 1;
+  radv_info->next_multicast_time = vlib_time_now (vm);
+  radv_info->last_multicast_time = vlib_time_now (vm);
+  radv_info->last_radv_time = 0;
+
+  return (0);
+}
+
+clib_error_t *
+ip6_ra_cmd (vlib_main_t * vm,
+	    unformat_input_t * main_input, vlib_cli_command_t * cmd)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  clib_error_t *error = 0;
+  u8 is_no = 0;
+  u8 suppress = 0, managed = 0, other = 0;
+  u8 suppress_ll_option = 0, send_unicast = 0, cease = 0;
+  u8 use_lifetime = 0;
+  u32 sw_if_index, ra_lifetime = 0, ra_initial_count =
+    0, ra_initial_interval = 0;
+  u32 ra_max_interval = 0, ra_min_interval = 0;
+
+  unformat_input_t _line_input, *line_input = &_line_input;
+
+  int add_radv_info = 1;
+  ip6_address_t ip6_addr;
+  u32 addr_len;
+
+
+  /* Get a line of input. */
+  if (!unformat_user (main_input, unformat_line_input, line_input))
+    return 0;
+
+  /* get basic radv info for this interface */
+  if (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+
+      if (unformat_user (line_input,
+			 unformat_vnet_sw_interface, vnm, &sw_if_index))
+	{
+	  if (!ip6_ra_get_eth_itf (sw_if_index))
+	    {
+	      error =
+		clib_error_return (0, "Interface must be of ethernet type");
+	      goto done;
+	    }
+
+	  if (!ip6_link_is_enabled (sw_if_index))
+	    {
+	      error = clib_error_return (0, "IP6 nt enabler interface %U'",
+					 format_unformat_error, line_input);
+	      goto done;
+	    }
+	}
+      else
+	{
+	  error = clib_error_return (0, "invalid interface name %U'",
+				     format_unformat_error, line_input);
+	  goto done;
+	}
+    }
+
+  /* get the rest of the command */
+  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (line_input, "no"))
+	is_no = 1;
+      else if (unformat (line_input, "prefix %U/%d",
+			 unformat_ip6_address, &ip6_addr, &addr_len))
+	{
+	  add_radv_info = 0;
+	  break;
+	}
+      else if (unformat (line_input, "ra-managed-config-flag"))
+	{
+	  managed = 1;
+	  break;
+	}
+      else if (unformat (line_input, "ra-other-config-flag"))
+	{
+	  other = 1;
+	  break;
+	}
+      else if (unformat (line_input, "ra-suppress") ||
+	       unformat (line_input, "ra-surpress"))
+	{
+	  suppress = 1;
+	  break;
+	}
+      else if (unformat (line_input, "ra-suppress-link-layer") ||
+	       unformat (line_input, "ra-surpress-link-layer"))
+	{
+	  suppress_ll_option = 1;
+	  break;
+	}
+      else if (unformat (line_input, "ra-send-unicast"))
+	{
+	  send_unicast = 1;
+	  break;
+	}
+      else if (unformat (line_input, "ra-lifetime"))
+	{
+	  if (!unformat (line_input, "%d", &ra_lifetime))
+	    {
+	      error = unformat_parse_error (line_input);
+	      goto done;
+	    }
+	  use_lifetime = 1;
+	  break;
+	}
+      else if (unformat (line_input, "ra-initial"))
+	{
+	  if (!unformat
+	      (line_input, "%d %d", &ra_initial_count, &ra_initial_interval))
+	    {
+	      error = unformat_parse_error (line_input);
+	      goto done;
+	    }
+	  break;
+	}
+      else if (unformat (line_input, "ra-interval"))
+	{
+	  if (!unformat (line_input, "%d", &ra_max_interval))
+	    {
+	      error = unformat_parse_error (line_input);
+	      goto done;
+	    }
+
+	  if (!unformat (line_input, "%d", &ra_min_interval))
+	    ra_min_interval = 0;
+	  break;
+	}
+      else if (unformat (line_input, "ra-cease"))
+	{
+	  cease = 1;
+	  break;
+	}
+      else
+	{
+	  error = unformat_parse_error (line_input);
+	  goto done;
+	}
+    }
+
+  if (add_radv_info)
+    {
+      ip6_ra_config (vm, sw_if_index,
+		     suppress, managed, other,
+		     suppress_ll_option, send_unicast, cease,
+		     use_lifetime, ra_lifetime,
+		     ra_initial_count, ra_initial_interval,
+		     ra_max_interval, ra_min_interval, is_no);
+    }
+  else
+    {
+      u32 valid_lifetime_in_secs = 0;
+      u32 pref_lifetime_in_secs = 0;
+      u8 use_prefix_default_values = 0;
+      u8 no_advertise = 0;
+      u8 off_link = 0;
+      u8 no_autoconfig = 0;
+      u8 no_onlink = 0;
+
+      /* get the rest of the command */
+      while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+	{
+	  if (unformat (line_input, "default"))
+	    {
+	      use_prefix_default_values = 1;
+	      break;
+	    }
+	  else if (unformat (line_input, "infinite"))
+	    {
+	      valid_lifetime_in_secs = ~0;
+	      pref_lifetime_in_secs = ~0;
+	      break;
+	    }
+	  else if (unformat (line_input, "%d %d", &valid_lifetime_in_secs,
+			     &pref_lifetime_in_secs))
+	    break;
+	  else
+	    break;
+	}
+
+
+      /* get the rest of the command */
+      while (!use_prefix_default_values &&
+	     unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+	{
+	  if (unformat (line_input, "no-advertise"))
+	    no_advertise = 1;
+	  else if (unformat (line_input, "off-link"))
+	    off_link = 1;
+	  else if (unformat (line_input, "no-autoconfig"))
+	    no_autoconfig = 1;
+	  else if (unformat (line_input, "no-onlink"))
+	    no_onlink = 1;
+	  else
+	    {
+	      error = unformat_parse_error (line_input);
+	      goto done;
+	    }
+	}
+
+      ip6_ra_prefix (vm, sw_if_index,
+		     &ip6_addr, addr_len,
+		     use_prefix_default_values,
+		     valid_lifetime_in_secs,
+		     pref_lifetime_in_secs,
+		     no_advertise, off_link, no_autoconfig, no_onlink, is_no);
+    }
+
+done:
+  unformat_free (line_input);
+
+  return error;
+}
+
+static u8 *
+format_ip6_ra (u8 * s, va_list * args)
+{
+  index_t rai = va_arg (*args, index_t);
+  u32 indent = va_arg (*args, u32);
+  ip6_radv_prefix_t *p;
+  ip6_ra_t *radv_info;
+
+  radv_info = pool_elt_at_index (ip6_ra_pool, rai);
+
+  s = format (s, "%UAdvertised Prefixes:\n", format_white_space, indent);
+
+  indent += 2;
+
+  /* *INDENT-OFF* */
+  pool_foreach (p, radv_info->adv_prefixes_pool,
+  ({
+    s = format (s, "%Uprefix %U, length %d\n",
+                format_white_space, indent+2,
+                format_ip6_address, &p->prefix, p->prefix_len);
+  }));
+  /* *INDENT-ON* */
+
+  s = format (s, "%UMTU is %d\n",
+	      format_white_space, indent, radv_info->adv_link_mtu);
+  s = format (s, "%UICMP error messages are unlimited\n",
+	      format_white_space, indent);
+  s = format (s, "%UICMP redirects are disabled\n",
+	      format_white_space, indent);
+  s = format (s, "%UICMP unreachables are not sent\n",
+	      format_white_space, indent);
+  s = format (s, "%UND DAD is disabled\n", format_white_space, indent);
+  //s = format (s, "%UND reachable time is %d milliseconds\n",);
+  s = format (s, "%UND advertised reachable time is %d\n",
+	      format_white_space, indent,
+	      radv_info->adv_neighbor_reachable_time_in_msec);
+  s = format (s,
+	      "%UND advertised retransmit interval is %d (msec)\n",
+	      format_white_space, indent,
+	      radv_info->
+	      adv_time_in_msec_between_retransmitted_neighbor_solicitations);
+  s =
+    format (s,
+	    "%UND router advertisements are sent every %0.1f seconds (min interval is %0.1f)\n",
+	    format_white_space, indent, radv_info->max_radv_interval,
+	    radv_info->min_radv_interval);
+  s =
+    format (s, "%UND router advertisements live for %d seconds\n",
+	    format_white_space, indent,
+	    radv_info->adv_router_lifetime_in_sec);
+  s =
+    format (s, "%UHosts %s stateless autoconfig for addresses\n",
+	    format_white_space, indent,
+	    (radv_info->adv_managed_flag) ? "use" : " don't use");
+  s =
+    format (s, "%UND router advertisements sent %d\n", format_white_space,
+	    indent, radv_info->n_advertisements_sent);
+  s =
+    format (s, "%UND router solicitations received %d\n", format_white_space,
+	    indent, radv_info->n_solicitations_rcvd);
+  s =
+    format (s, "%UND router solicitations dropped %d\n", format_white_space,
+	    indent, radv_info->n_solicitations_dropped);
+
+  return (s);
+}
+
+
+/*?
+ * This command is used to configure the neighbor discovery
+ * parameters on a given interface. Use the '<em>show ip6 interface</em>'
+ * command to display some of the current neighbor discovery parameters
+ * on a given interface. This command has three formats:
+ *
+ *
+ * <b>Format 1 - Router Advertisement Options:</b> (Only one can be entered in a single command)
+ *
+ * '<em><b>ip6 nd <interface> [no] [ra-managed-config-flag] | [ra-other-config-flag] | [ra-suppress] | [ra-suppress-link-layer] | [ra-send-unicast] | [ra-lifetime <lifetime>] | [ra-initial <cnt> <interval>] | [ra-interval <max-interval> [<min-interval>]] | [ra-cease]</b></em>'
+ *
+ * Where:
+ *
+ * <em>[no] ra-managed-config-flag</em> - Advertises in ICMPv6
+ * router-advertisement messages to use stateful address
+ * auto-configuration to obtain address information (sets the M-bit).
+ * Default is the M-bit is not set and the '<em>no</em>' option
+ * returns it to this default state.
+ *
+ * <em>[no] ra-other-config-flag</em> - Indicates in ICMPv6
+ * router-advertisement messages that hosts use stateful auto
+ * configuration to obtain nonaddress related information (sets
+ * the O-bit). Default is the O-bit is not set and the '<em>no</em>'
+ * option returns it to this default state.
+ *
+ * <em>[no] ra-suppress</em> - Disables sending ICMPv6 router-advertisement
+ * messages. The '<em>no</em>' option implies to enable sending ICMPv6
+ * router-advertisement messages.
+ *
+ * <em>[no] ra-suppress-link-layer</em> - Indicates not to include the
+ * optional source link-layer address in the ICMPv6 router-advertisement
+ * messages. Default is to include the optional source link-layer address
+ * and the '<em>no</em>' option returns it to this default state.
+ *
+ * <em>[no] ra-send-unicast</em> - Use the source address of the
+ * router-solicitation message if availiable. The default is to use
+ * multicast address of all nodes, and the '<em>no</em>' option returns
+ * it to this default state.
+ *
+ * <em>[no] ra-lifetime <lifetime></em> - Advertises the lifetime of a
+ * default router in ICMPv6 router-advertisement messages. The range is
+ * from 0 to 9000 seconds. '<em><lifetime></em>' must be greater than
+ * '<em><max-interval></em>'. The default value is 600 seconds and the
+ * '<em>no</em>' option returns it to this default value.
+ *
+ * <em>[no] ra-initial <cnt> <interval></em> - Number of initial ICMPv6
+ * router-advertisement messages sent and the interval between each
+ * message. Range for count is 1 - 3 and default is 3. Range for interval
+ * is 1 to 16 seconds, and default is 16 seconds. The '<em>no</em>' option
+ * returns both to their default value.
+ *
+ * <em>[no] ra-interval <max-interval> [<min-interval>]</em> - Configures the
+ * interval between sending ICMPv6 router-advertisement messages. The
+ * range for max-interval is from 4 to 200 seconds. min-interval can not
+ * be more than 75% of max-interval. If not set, min-interval will be
+ * set to 75% of max-interval. The range for min-interval is from 3 to
+ * 150 seconds.  The '<em>no</em>' option returns both to their default
+ * value.
+ *
+ * <em>[no] ra-cease</em> - Cease sending ICMPv6 router-advertisement messages.
+ * The '<em>no</em>' options implies to start (or restart) sending
+ * ICMPv6 router-advertisement messages.
+ *
+ *
+ * <b>Format 2 - Prefix Options:</b>
+ *
+ * '<em><b>ip6 nd <interface> [no] prefix <ip6-address>/<width> [<valid-lifetime> <pref-lifetime> | infinite] [no-advertise] [off-link] [no-autoconfig] [no-onlink]</b></em>'
+ *
+ * Where:
+ *
+ * <em>no</em> - All additional flags are ignored and the prefix is deleted.
+ *
+ * <em><valid-lifetime> <pref-lifetime></em> - '<em><valid-lifetime></em>' is the
+ * length of time in seconds during what the prefix is valid for the purpose of
+ * on-link determination. Range is 7203 to 2592000 seconds and default is 2592000
+ * seconds (30 days). '<em><pref-lifetime></em>' is the prefered-lifetime and is the
+ * length of time in seconds during what addresses generated from the prefix remain
+ * preferred. Range is 0 to 604800 seconds and default is 604800 seconds (7 days).
+ *
+ * <em>infinite</em> - Both '<em><valid-lifetime></em>' and '<em><<pref-lifetime></em>'
+ * are inifinte, no timeout.
+ *
+ * <em>no-advertise</em> - Do not send full router address in prefix
+ * advertisement. Default is to advertise (i.e. - This flag is off by default).
+ *
+ * <em>off-link</em> - Prefix is off-link, clear L-bit in packet. Default is on-link
+ * (i.e. - This flag is off and L-bit in packet is set by default and this prefix can
+ * be used for on-link determination). '<em>no-onlink</em>' also controls the L-bit.
+ *
+ * <em>no-autoconfig</em> - Do not use prefix for autoconfiguration, clear A-bit in packet.
+ * Default is autoconfig (i.e. - This flag is off and A-bit in packet is set by default.
+ *
+ * <em>no-onlink</em> - Do not use prefix for onlink determination, clear L-bit in packet.
+ * Default is on-link (i.e. - This flag is off and L-bit in packet is set by default and
+ * this prefix can be used for on-link determination). '<em>off-link</em>' also controls
+ * the L-bit.
+ *
+ *
+ * <b>Format 3: - Default of Prefix:</b>
+ *
+ * '<em><b>ip6 nd <interface> [no] prefix <ip6-address>/<width> default</b></em>'
+ *
+ * When a new prefix is added (or existing one is being overwritten) <em>default</em>
+ * uses default values for the prefix. If <em>no</em> is used, the <em>default</em>
+ * is ignored and the prefix is deleted.
+ *
+ *
+ * @cliexpar
+ * Example of how set a router advertisement option:
+ * @cliexcmd{ip6 nd GigabitEthernet2/0/0 ra-interval 100 20}
+ * Example of how to add a prefix:
+ * @cliexcmd{ip6 nd GigabitEthernet2/0/0 prefix fe80::fe:28ff:fe9c:75b3/64 infinite no-advertise}
+ * Example of how to delete a prefix:
+ * @cliexcmd{ip6 nd GigabitEthernet2/0/0 no prefix fe80::fe:28ff:fe9c:75b3/64}
+?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (ip6_nd_command, static) =
+{
+  .path = "ip6 nd",
+  .short_help = "ip6 nd <interface> ...",
+  .function = ip6_ra_cmd,
+};
+/* *INDENT-ON* */
+
+/**
+ * VFT for registering as a delegate to an IP6 link
+ */
+const static ip6_link_delegate_vft_t ip6_ra_delegate_vft = {
+  .ildv_disable = ip6_ra_delegate_disable,
+  .ildv_enable = ip6_ra_link_enable,
+  .ildv_format = format_ip6_ra,
+};
+
+static clib_error_t *
+ip6_ra_init (vlib_main_t * vm)
+{
+  vlib_call_init_function (vm, icmp6_init);
+
+  icmp6_register_type (vm, ICMP6_router_solicitation,
+		       ip6_icmp_router_solicitation_node.index);
+  icmp6_register_type (vm, ICMP6_router_advertisement,
+		       ip6_icmp_router_advertisement_node.index);
+
+  ip6_ra_delegate_id = ip6_link_delegate_register (&ip6_ra_delegate_vft);
+
+  return (NULL);
+}
+
+/* *INDENT-OFF* */
+VLIB_INIT_FUNCTION (ip6_ra_init) =
+{
+  .runs_after = VLIB_INITS("icmp6_init"),
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */