Implement DHCPv6 PD client (VPP-718, VPP-1050)

Change-Id: I72a1ccdfdd5573335ef78fc01d5268934c73bd31
Signed-off-by: Juraj Sloboda <jsloboda@cisco.com>

1 files changed, 1141 insertions, 0 deletions

diff --git a/src/vnet/dhcp/dhcp6_pd_client_dp.c b/src/vnet/dhcp/dhcp6_pd_client_dp.c
new file mode 100644
index 00000000000..c14a3119c43
--- /dev/null
+++ b/src/vnet/dhcp/dhcp6_pd_client_dp.c
@@ -0,0 +1,1141 @@
+/*
+ * 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.
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/dhcp/dhcp6_packet.h>
+#include <vnet/dhcp/dhcp_proxy.h>
+#include <vnet/mfib/mfib_table.h>
+#include <vnet/mfib/ip6_mfib.h>
+#include <vnet/fib/fib.h>
+#include <vnet/adj/adj_mcast.h>
+#include <vnet/ip/ip6_neighbor.h>
+#include <vlibapi/api_common.h>
+#include <vlibmemory/api.h>
+#include <vnet/dhcp/dhcp6_pd_client_dp.h>
+
+#include <vnet/vnet_msg_enum.h>
+
+#define vl_typedefs		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_typedefs
+
+#define vl_endianfun		/* define message structures */
+#include <vnet/vnet_all_api_h.h>
+#undef vl_endianfun
+
+/* instantiate all the print functions we know about */
+#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
+#define vl_printfun
+#include <vnet/vnet_all_api_h.h>
+#undef vl_printfun
+
+#include <vlibapi/api_helper_macros.h>
+
+typedef struct
+{
+  u8 entry_valid;
+  u8 keep_sending_client_message;	/* when true then next fields are valid */
+  dhcp6_pd_send_client_message_params_t params;
+  f64 transaction_start;
+  f64 sleep_interval;
+  f64 due_time;
+  u32 n_left;
+  f64 start_time;
+  u32 transaction_id;
+  vlib_buffer_t *buffer;
+  u32 elapsed_pos;
+  u32 adj_index;
+} dhcp6_pd_client_state_t;
+
+typedef struct
+{
+  u8 *data;
+  u16 len;
+} server_id_t;
+
+typedef struct
+{
+  dhcp6_pd_client_state_t *client_state_by_sw_if_index;
+  server_id_t *server_ids;
+
+  uword publisher_node;
+  uword publisher_et;
+
+  u32 seed;
+
+  /* convenience */
+  vlib_main_t *vlib_main;
+  vnet_main_t *vnet_main;
+} dhcp6_pd_client_main_t;
+
+static dhcp6_pd_client_main_t dhcp6_pd_client_main;
+dhcp6_pd_client_public_main_t dhcp6_pd_client_public_main;
+
+typedef struct
+{
+  ip6_address_t prefix;
+  u8 prefix_length;
+  u32 valid_time;
+  u32 preferred_time;
+  u16 status_code;
+} prefix_info_t;
+
+typedef struct
+{
+  u32 sw_if_index;
+  u32 server_index;
+  u8 msg_type;
+  u32 T1;
+  u32 T2;
+  u16 inner_status_code;
+  u16 status_code;
+  u8 preference;
+  u32 n_prefixes;
+  prefix_info_t *prefixes;
+} report_t;
+
+typedef union
+{
+  CLIB_PACKED (struct
+	       {
+	       u16 duid_type;
+	       u16 hardware_type;
+	       u32 time;
+	       u8 lla[6];
+	       });
+  char bin_string[14];
+} dhcpv6_duid_string_t;
+
+static dhcpv6_duid_string_t client_duid;
+#define CLIENT_DUID_LENGTH sizeof (client_duid)
+#define DHCPV6_CLIENT_IAID 1
+
+static void
+signal_report (report_t * r)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main;
+  uword ni = cm->publisher_node;
+  uword et = cm->publisher_et;
+
+  if (ni == (uword) ~ 0)
+    return;
+  report_t *q = vlib_process_signal_event_data (vm, ni, et, 1, sizeof *q);
+
+  *q = *r;
+}
+
+static int
+publish_report (report_t * r)
+{
+  void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
+  vl_api_rpc_call_main_thread (signal_report, (u8 *) r, sizeof *r);
+  return 0;
+}
+
+void
+dhcp6_pd_set_publisher_node (uword node_index, uword event_type)
+{
+  dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main;
+  cm->publisher_node = node_index;
+  cm->publisher_et = event_type;
+}
+
+#define foreach_dhcpv6_pd_client \
+  _(DROP, "error-drop")          \
+  _(LOOKUP, "ip6-lookup")
+
+typedef enum
+{
+#define _(sym,str) DHCPV6_PD_CLIENT_NEXT_##sym,
+  foreach_dhcpv6_pd_client
+#undef _
+    DHCPV6_PD_CLIENT_N_NEXT,
+} dhcpv6_pd_client_next_t;
+
+/**
+ * per-packet trace data
+ */
+typedef struct dhcpv6_pd_client_trace_t_
+{
+} dhcpv6_pd_client_trace_t;
+
+static u8 *
+format_dhcpv6_pd_client_trace (u8 * s, va_list * args)
+{
+  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+  //dhcpv6_pd_client_trace_t *t = va_arg (*args, dhcpv6_pd_client_trace_t *);
+
+  s = format (s, "nothing");
+
+  return s;
+}
+
+static u32
+server_index_get_or_create (u8 * data, u16 len)
+{
+  dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main;
+  u32 i;
+  server_id_t *se;
+  server_id_t new_se;
+
+  for (i = 0; i < vec_len (cm->server_ids); i++)
+    {
+      se = &cm->server_ids[i];
+      if (se->len == len && 0 == memcmp (se->data, data, len))
+	return i;
+    }
+
+  new_se.len = len;
+  new_se.data = 0;
+  vec_validate (new_se.data, len - 1);
+  memcpy (new_se.data, data, len);
+
+  vec_add1 (cm->server_ids, new_se);
+
+  return vec_len (cm->server_ids) - 1;
+}
+
+static void
+stop_sending_client_message (vlib_main_t * vm,
+			     dhcp6_pd_client_state_t * client_state)
+{
+  u32 bi0;
+
+  client_state->keep_sending_client_message = 0;
+  vec_free (client_state->params.prefixes);
+  if (client_state->buffer)
+    {
+      bi0 = vlib_get_buffer_index (vm, client_state->buffer);
+      vlib_buffer_free (vm, &bi0, 1);
+      client_state->buffer = 0;
+      adj_unlock (client_state->adj_index);
+      client_state->adj_index = ~0;
+    }
+}
+
+static uword
+dhcpv6_pd_client_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
+			  vlib_frame_t * frame)
+{
+  dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main;
+
+  dhcpv6_pd_client_next_t next_index;
+  u32 n_left_from, *from, *to_next;
+  next_index = 0;
+  n_left_from = frame->n_vectors;
+  from = vlib_frame_vector_args (frame);
+
+  while (n_left_from > 0)
+    {
+      u32 n_left_to_next;
+
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  ip6_header_t *ip0;
+	  u32 options_length;
+	  dhcpv6_header_t *dhcpv60;
+	  dhcpv6_option_t *option;
+	  vlib_buffer_t *b0;
+	  report_t report;
+	  u32 next0 = DHCPV6_PD_CLIENT_NEXT_DROP;
+	  u32 bi0;
+	  u32 xid;
+	  u32 sw_if_index;
+	  u32 iaid;
+	  u8 client_id_present = 0;
+	  u8 discard = 0;
+
+	  dhcp6_pd_client_state_t *client_state = NULL;
+
+	  bi0 = from[0];
+	  to_next[0] = bi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+
+	  dhcpv60 = vlib_buffer_get_current (b0);
+	  ip0 = (void *) (b0->data + vnet_buffer (b0)->l3_hdr_offset);
+	  u32 dhcpv6_ip6_palyoad_offset =
+	    (u8 *) dhcpv60 - ((u8 *) ip0 + sizeof (*ip0));
+	  options_length =
+	    ntohs (ip0->payload_length) - dhcpv6_ip6_palyoad_offset -
+	    sizeof (*dhcpv60);
+
+	  memset (&report, 0, sizeof (report));
+
+	  sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+	  if (sw_if_index >= vec_len (cm->client_state_by_sw_if_index))
+	    client_state = 0;
+	  else
+	    client_state = &cm->client_state_by_sw_if_index[sw_if_index];
+
+	  xid =
+	    (dhcpv60->xid[0] << 16) + (dhcpv60->xid[1] << 8) +
+	    dhcpv60->xid[2];
+	  if (!client_state || client_state->transaction_id != xid)
+	    {
+	      clib_warning
+		("Received DHCPv6 message with wrong Transaction ID");
+	      discard = 1;
+	    }
+
+	  report.sw_if_index = sw_if_index;
+	  report.msg_type = dhcpv60->msg_type;
+	  report.server_index = ~0;
+
+	  switch (dhcpv60->msg_type)
+	    {
+	    case DHCPV6_MSG_ADVERTISE:
+	    case DHCPV6_MSG_REPLY:
+	      option = (dhcpv6_option_t *) (dhcpv60 + 1);
+	      while (options_length > 0)
+		{
+		  if (options_length <
+		      ntohs (option->length) + sizeof (*option))
+		    {
+		      clib_warning
+			("remaining payload length < option length (%d < %d)",
+			 options_length,
+			 ntohs (option->length) + sizeof (*option));
+		      break;
+		    }
+		  u16 oo = ntohs (option->option);
+		  if (oo == DHCPV6_OPTION_IA_PD)
+		    {
+		      u8 discard_ia_pd = 0;
+		      dhcpv6_ia_header_t *ia_header = (void *) option;
+		      iaid = ntohl (ia_header->iaid);
+		      u32 T1 = ntohl (ia_header->t1);
+		      u32 T2 = ntohl (ia_header->t2);
+		      if (iaid != DHCPV6_CLIENT_IAID)
+			discard_ia_pd = 1;
+		      if (T1 != 0 && T2 != 0 && T1 > T2)
+			discard_ia_pd = 1;
+		      if (!discard_ia_pd)
+			{
+			  report.T1 = T1;
+			  report.T2 = T2;
+			}
+		      dhcpv6_option_t *inner_option =
+			(void *) ia_header->data;
+		      u16 inner_options_length =
+			ntohs (option->length) - (sizeof (*ia_header) -
+						  sizeof (dhcpv6_option_t));
+		      while (inner_options_length > 0)
+			{
+			  u16 inner_oo = ntohs (inner_option->option);
+			  if (discard_ia_pd)
+			    ;
+			  else if (inner_oo == DHCPV6_OPTION_IAPREFIX)
+			    {
+			      dhcpv6_ia_opt_pd_t *iaprefix =
+				(void *) inner_option;
+			      vec_validate (report.prefixes,
+					    report.n_prefixes);
+			      prefix_info_t *prefix_info =
+				&report.prefixes[report.n_prefixes];
+			      report.n_prefixes++;
+			      prefix_info->preferred_time =
+				ntohl (iaprefix->preferred);
+			      prefix_info->valid_time =
+				ntohl (iaprefix->valid);
+			      prefix_info->prefix_length = iaprefix->prefix;
+			      prefix_info->prefix = iaprefix->addr;
+			    }
+			  else if (inner_oo == DHCPV6_OPTION_STATUS_CODE)
+			    {
+			      dhcpv6_status_code_t *sc =
+				(void *) inner_option;
+			      report.inner_status_code =
+				ntohs (sc->status_code);
+			    }
+			  inner_options_length -=
+			    sizeof (*inner_option) +
+			    ntohs (inner_option->length);
+			  inner_option =
+			    (void *) ((u8 *) inner_option +
+				      sizeof (*inner_option) +
+				      ntohs (inner_option->length));
+			}
+		    }
+		  else if (oo == DHCPV6_OPTION_CLIENTID)
+		    {
+		      if (client_id_present)
+			{
+			  clib_warning
+			    ("Duplicate Client ID in received DHVPv6 message");
+			  discard = 1;
+			}
+		      else
+			{
+			  u16 len = ntohs (option->length);
+			  client_id_present = 1;
+			  if (len != CLIENT_DUID_LENGTH ||
+			      0 != memcmp (option->data,
+					   client_duid.bin_string,
+					   CLIENT_DUID_LENGTH))
+			    {
+			      clib_warning
+				("Unrecognized client DUID inside received DHVPv6 message");
+			      discard = 1;
+			    }
+			}
+		    }
+		  else if (oo == DHCPV6_OPTION_SERVERID)
+		    {
+		      if (report.server_index != ~0)
+			{
+			  clib_warning
+			    ("Duplicate Server ID in received DHVPv6 message");
+			  discard = 1;
+			}
+		      else
+			report.server_index =
+			  server_index_get_or_create (option->data,
+						      ntohs (option->length));
+		    }
+		  else if (oo == DHCPV6_OPTION_PREFERENCE)
+		    {
+		      report.preference = option->data[0];
+		    }
+		  else if (oo == DHCPV6_OPTION_STATUS_CODE)
+		    {
+		      dhcpv6_status_code_t *sc = (void *) option;
+		      report.status_code = ntohs (sc->status_code);
+		    }
+		  options_length -= sizeof (*option) + ntohs (option->length);
+		  option =
+		    (void *) ((u8 *) option + sizeof (*option) +
+			      ntohs (option->length));
+		}
+
+	      if (!client_id_present)
+		{
+		  clib_warning
+		    ("Missing Client ID in received DHVPv6 message");
+		  discard = 1;
+		}
+	      if (report.server_index == ~0)
+		{
+		  clib_warning
+		    ("Missing Server ID in received DHVPv6 message");
+		  discard = 1;
+		}
+
+	      if (!discard)
+		publish_report (&report);
+	      else
+		vec_free (report.prefixes);
+
+	      break;
+	    default:
+	      break;
+	    }
+
+	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      dhcpv6_pd_client_trace_t *t =
+		vlib_add_trace (vm, node, b0, sizeof (*t));
+	    }
+
+	  /* verify speculative enqueue, maybe switch current next frame */
+	  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);
+    }
+
+  return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (dhcpv6_pd_client_node, static) = {
+    .function = dhcpv6_pd_client_node_fn,
+    .name = "dhcpv6-pd-client",
+    .vector_size = sizeof (u32),
+
+    .n_errors = 0,
+
+    .n_next_nodes = DHCPV6_PD_CLIENT_N_NEXT,
+    .next_nodes = {
+  #define _(s,n) [DHCPV6_PD_CLIENT_NEXT_##s] = n,
+      foreach_dhcpv6_pd_client
+  #undef _
+    },
+
+    .format_trace = format_dhcpv6_pd_client_trace,
+};
+/* *INDENT-ON* */
+
+static_always_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 const ip6_address_t all_dhcp6_relay_agents_and_servers = {
+  .as_u8 = {
+	    0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	    0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}
+};
+
+static vlib_buffer_t *
+create_buffer_for_client_message (vlib_main_t * vm,
+				  u32 sw_if_index,
+				  dhcp6_pd_client_state_t
+				  * client_state, u32 type)
+{
+  dhcp6_pd_client_main_t *dm = &dhcp6_pd_client_main;
+  vnet_main_t *vnm = vnet_get_main ();
+
+  vlib_buffer_t *b;
+  u32 bi;
+  ip6_header_t *ip;
+  udp_header_t *udp;
+  dhcpv6_header_t *dhcp;
+  ip6_address_t src_addr;
+  u32 dhcp_opt_len = 0;
+  client_state->transaction_start = vlib_time_now (vm);
+  u32 n_prefixes;
+  u32 i;
+
+  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, sw_if_index);
+  vnet_sw_interface_t *sup_sw = vnet_get_sup_sw_interface (vnm, sw_if_index);
+  vnet_sw_interface_t *sw = vnet_get_sw_interface (vnm, sw_if_index);
+
+  /* Interface(s) down? */
+  if ((hw->flags & VNET_HW_INTERFACE_FLAG_LINK_UP) == 0)
+    return NULL;
+  if ((sup_sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0)
+    return NULL;
+  if ((sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0)
+    return NULL;
+
+  /* Get a link-local address */
+  src_addr = ip6_neighbor_get_link_local_address (sw_if_index);
+
+  if (src_addr.as_u8[0] != 0xfe)
+    {
+      clib_warning ("Could not find source address to send DHCPv6 packet");
+      return NULL;
+    }
+
+  if (vlib_buffer_alloc (vm, &bi, 1) != 1)
+    {
+      clib_warning ("Buffer allocation failed");
+      return NULL;
+    }
+
+  b = vlib_get_buffer (vm, bi);
+  vnet_buffer (b)->sw_if_index[VLIB_RX] = sw_if_index;
+  vnet_buffer (b)->sw_if_index[VLIB_TX] = sw_if_index;
+  client_state->adj_index = adj_mcast_add_or_lock (FIB_PROTOCOL_IP6,
+						   VNET_LINK_IP6,
+						   sw_if_index);
+  vnet_buffer (b)->ip.adj_index[VLIB_TX] = client_state->adj_index;
+  b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+
+  ip = (ip6_header_t *) vlib_buffer_get_current (b);
+  udp = (udp_header_t *) (ip + 1);
+  dhcp = (dhcpv6_header_t *) (udp + 1);
+
+  ip->src_address = src_addr;
+  ip->hop_limit = 255;
+  ip->ip_version_traffic_class_and_flow_label =
+    clib_host_to_net_u32 (0x6 << 28);
+  ip->payload_length = 0;
+  ip->protocol = IP_PROTOCOL_UDP;
+
+  udp->src_port = clib_host_to_net_u16 (DHCPV6_CLIENT_PORT);
+  udp->dst_port = clib_host_to_net_u16 (DHCPV6_SERVER_PORT);
+  udp->checksum = 0;
+  udp->length = 0;
+
+  dhcp->msg_type = type;
+  dhcp->xid[0] = (client_state->transaction_id & 0x00ff0000) >> 16;
+  dhcp->xid[1] = (client_state->transaction_id & 0x0000ff00) >> 8;
+  dhcp->xid[2] = (client_state->transaction_id & 0x000000ff) >> 0;
+
+  void *d = (void *) dhcp->data;
+  dhcpv6_option_t *duid;
+  dhcpv6_elapsed_t *elapsed;
+  dhcpv6_ia_header_t *ia_hdr;
+  dhcpv6_ia_opt_pd_t *opt_pd;
+  if (type == DHCPV6_MSG_SOLICIT || type == DHCPV6_MSG_REQUEST ||
+      type == DHCPV6_MSG_RENEW || type == DHCPV6_MSG_REBIND ||
+      type == DHCPV6_MSG_RELEASE)
+    {
+      duid = (dhcpv6_option_t *) d;
+      duid->option = clib_host_to_net_u16 (DHCPV6_OPTION_CLIENTID);
+      duid->length = clib_host_to_net_u16 (CLIENT_DUID_LENGTH);
+      clib_memcpy (duid + 1, client_duid.bin_string, CLIENT_DUID_LENGTH);
+      d += sizeof (*duid) + CLIENT_DUID_LENGTH;
+
+      if (client_state->params.server_index != ~0)
+	{
+	  server_id_t *se =
+	    &dm->server_ids[client_state->params.server_index];
+
+	  duid = (dhcpv6_option_t *) d;
+	  duid->option = clib_host_to_net_u16 (DHCPV6_OPTION_SERVERID);
+	  duid->length = clib_host_to_net_u16 (se->len);
+	  clib_memcpy (duid + 1, se->data, se->len);
+	  d += sizeof (*duid) + se->len;
+	}
+
+      elapsed = (dhcpv6_elapsed_t *) d;
+      elapsed->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_ELAPSED_TIME);
+      elapsed->opt.length =
+	clib_host_to_net_u16 (sizeof (*elapsed) - sizeof (elapsed->opt));
+      elapsed->elapsed_10ms = 0;
+      client_state->elapsed_pos =
+	(char *) &elapsed->elapsed_10ms -
+	(char *) vlib_buffer_get_current (b);
+      d += sizeof (*elapsed);
+
+      ia_hdr = (dhcpv6_ia_header_t *) d;
+      ia_hdr->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_IA_PD);
+      ia_hdr->iaid = clib_host_to_net_u32 (DHCPV6_CLIENT_IAID);
+      ia_hdr->t1 = clib_host_to_net_u32 (client_state->params.T1);
+      ia_hdr->t2 = clib_host_to_net_u32 (client_state->params.T2);
+      d += sizeof (*ia_hdr);
+
+      n_prefixes = vec_len (client_state->params.prefixes);
+
+      ia_hdr->opt.length =
+	clib_host_to_net_u16 (sizeof (*ia_hdr) +
+			      n_prefixes * sizeof (*opt_pd) -
+			      sizeof (ia_hdr->opt));
+
+      for (i = 0; i < n_prefixes; i++)
+	{
+	  dhcp6_pd_send_client_message_params_prefix_t *pref =
+	    &client_state->params.prefixes[i];
+	  opt_pd = (dhcpv6_ia_opt_pd_t *) d;
+	  opt_pd->opt.option = clib_host_to_net_u16 (DHCPV6_OPTION_IAPREFIX);
+	  opt_pd->opt.length =
+	    clib_host_to_net_u16 (sizeof (*opt_pd) - sizeof (opt_pd->opt));
+	  opt_pd->addr = pref->prefix;
+	  opt_pd->prefix = pref->prefix_length;
+	  opt_pd->valid = clib_host_to_net_u32 (pref->valid_lt);
+	  opt_pd->preferred = clib_host_to_net_u32 (pref->preferred_lt);
+	  d += sizeof (*opt_pd);
+	}
+    }
+  else
+    {
+      clib_warning ("State not implemented");
+    }
+
+  dhcp_opt_len = ((u8 *) d) - dhcp->data;
+  udp->length =
+    clib_host_to_net_u16 (sizeof (*udp) + sizeof (*dhcp) + dhcp_opt_len);
+  ip->payload_length = udp->length;
+  b->current_length =
+    sizeof (*ip) + sizeof (*udp) + sizeof (*dhcp) + dhcp_opt_len;
+
+  ip->dst_address = all_dhcp6_relay_agents_and_servers;
+
+  return b;
+}
+
+static inline u8
+check_pd_send_client_message (vlib_main_t * vm,
+			      dhcp6_pd_client_state_t * client_state,
+			      f64 current_time, f64 * due_time)
+{
+  vlib_buffer_t *p0;
+  vlib_frame_t *f;
+  u32 *to_next;
+  u32 next_index;
+  vlib_buffer_t *c0;
+  ip6_header_t *ip;
+  udp_header_t *udp;
+  u32 ci0;
+  int bogus_length = 0;
+
+  dhcp6_pd_send_client_message_params_t *params;
+
+  f64 now = vlib_time_now (vm);
+
+  if (!client_state->keep_sending_client_message)
+    return false;
+
+  params = &client_state->params;
+
+  if (client_state->due_time > current_time)
+    {
+      *due_time = client_state->due_time;
+      return true;
+    }
+
+  p0 = client_state->buffer;
+
+  next_index = ip6_rewrite_mcast_node.index;
+
+  c0 = vlib_buffer_copy (vm, p0);
+  ci0 = vlib_get_buffer_index (vm, c0);
+
+  ip = (ip6_header_t *) vlib_buffer_get_current (c0);
+  udp = (udp_header_t *) (ip + 1);
+
+  u16 *elapsed_field = (u16 *) ((void *) ip + client_state->elapsed_pos);
+  *elapsed_field =
+    clib_host_to_net_u16 ((u16)
+			  ((now - client_state->transaction_start) * 100));
+
+  udp->checksum = 0;
+  udp->checksum =
+    ip6_tcp_udp_icmp_compute_checksum (vm, 0, ip, &bogus_length);
+
+  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 && --client_state->n_left == 0)
+    stop_sending_client_message (vm, client_state);
+  else
+    {
+      client_state->sleep_interval =
+	(2 + random_f64_from_to (-0.1, 0.1)) * client_state->sleep_interval;
+      if (client_state->sleep_interval > params->mrt)
+	client_state->sleep_interval =
+	  (1 + random_f64_from_to (-0.1, 0.1)) * params->mrt;
+
+      client_state->due_time = current_time + client_state->sleep_interval;
+
+      if (params->mrd != 0
+	  && current_time > client_state->start_time + params->mrd)
+	stop_sending_client_message (vm, client_state);
+      else
+	*due_time = client_state->due_time;
+    }
+
+  return client_state->keep_sending_client_message;
+}
+
+static uword
+send_dhcp6_pd_client_message_process (vlib_main_t * vm,
+				      vlib_node_runtime_t * rt,
+				      vlib_frame_t * f0)
+{
+  dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main;
+  dhcp6_pd_client_state_t *client_state;
+  uword *event_data = 0;
+  f64 sleep_time = 1e9;
+  f64 current_time;
+  f64 due_time;
+  f64 dt = 0;
+  int i;
+
+  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;
+	  for (i = 0; i < vec_len (cm->client_state_by_sw_if_index); i++)
+	    {
+	      client_state = &cm->client_state_by_sw_if_index[i];
+	      if (!client_state->entry_valid)
+		continue;
+	      if (check_pd_send_client_message
+		  (vm, client_state, current_time, &dt) && (dt < due_time))
+		due_time = dt;
+	    }
+	  current_time = vlib_time_now (vm);
+	}
+      while (due_time < current_time);
+
+      sleep_time = due_time - current_time;
+    }
+
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (send_dhcp6_pd_client_message_process_node) = {
+    .function = send_dhcp6_pd_client_message_process,
+    .type = VLIB_NODE_TYPE_PROCESS,
+    .name = "send-dhcp6-pd-client-message-process",
+};
+/* *INDENT-ON* */
+
+void
+dhcp6_pd_send_client_message (vlib_main_t * vm, u32 sw_if_index, u8 stop,
+			      dhcp6_pd_send_client_message_params_t * params)
+{
+  dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main;
+  dhcp6_pd_client_state_t *client_state = 0;
+  dhcp6_pd_client_state_t empty_state = {
+    0,
+  };
+
+  ASSERT (~0 != sw_if_index);
+
+  vec_validate_init_empty (cm->client_state_by_sw_if_index, sw_if_index,
+			   empty_state);
+  client_state = &cm->client_state_by_sw_if_index[sw_if_index];
+  if (!client_state->entry_valid)
+    {
+      client_state->entry_valid = 1;
+      client_state->adj_index = ~0;
+    }
+
+  stop_sending_client_message (vm, client_state);
+
+  if (!stop)
+    {
+      client_state->keep_sending_client_message = 1;
+      vec_free (client_state->params.prefixes);
+      client_state->params = *params;
+      client_state->params.prefixes = vec_dup (params->prefixes);
+      client_state->n_left = params->mrc;
+      client_state->start_time = vlib_time_now (vm);
+      client_state->sleep_interval =
+	(1 + random_f64_from_to (-0.1, 0.1)) * params->irt;
+      client_state->due_time = 0;	/* send first packet ASAP */
+      client_state->transaction_id = random_u32 (&cm->seed) & 0x00ffffff;
+      client_state->buffer =
+	create_buffer_for_client_message (vm, sw_if_index, client_state,
+					  params->msg_type);
+      if (!client_state->buffer)
+	client_state->keep_sending_client_message = 0;
+      else
+	vlib_process_signal_event (vm,
+				   send_dhcp6_pd_client_message_process_node.index,
+				   1, 0);
+    }
+}
+
+void
+  vl_api_dhcp6_pd_send_client_message_t_handler
+  (vl_api_dhcp6_pd_send_client_message_t * mp)
+{
+  vl_api_dhcp6_pd_send_client_message_reply_t *rmp;
+  dhcp6_pd_send_client_message_params_t params;
+  vlib_main_t *vm = vlib_get_main ();
+  u32 n_prefixes;
+  u32 i;
+  int rv = 0;
+
+  VALIDATE_SW_IF_INDEX (mp);
+
+  BAD_SW_IF_INDEX_LABEL;
+  REPLY_MACRO (VL_API_DHCP6_PD_SEND_CLIENT_MESSAGE_REPLY);
+
+  if (rv != 0)
+    return;
+
+  params.sw_if_index = ntohl (mp->sw_if_index);
+  params.server_index = ntohl (mp->server_index);
+  params.irt = ntohl (mp->irt);
+  params.mrt = ntohl (mp->mrt);
+  params.mrc = ntohl (mp->mrc);
+  params.mrd = ntohl (mp->mrd);
+  params.msg_type = mp->msg_type;
+  params.T1 = ntohl (mp->T1);
+  params.T2 = ntohl (mp->T2);
+  n_prefixes = ntohl (mp->n_prefixes);
+  params.prefixes = 0;
+  if (n_prefixes > 0)
+    vec_validate (params.prefixes, n_prefixes - 1);
+  for (i = 0; i < n_prefixes; i++)
+    {
+      vl_api_dhcp6_pd_prefix_info_t *pi = &mp->prefixes[i];
+      dhcp6_pd_send_client_message_params_prefix_t *pref =
+	&params.prefixes[i];
+      pref->preferred_lt = ntohl (pi->preferred_time);
+      pref->valid_lt = ntohl (pi->valid_time);
+      memcpy (pref->prefix.as_u8, pi->prefix, 16);
+      pref->prefix_length = pi->prefix_length;
+    }
+
+  dhcp6_pd_send_client_message (vm, ntohl (mp->sw_if_index), mp->stop,
+				&params);
+}
+
+static clib_error_t *
+call_dhcp6_pd_reply_event_callbacks (void *data,
+				     _vnet_dhcp6_pd_reply_event_function_list_elt_t
+				     * elt)
+{
+  clib_error_t *error = 0;
+
+  while (elt)
+    {
+      error = elt->fp (data);
+      if (error)
+	return error;
+      elt = elt->next_dhcp6_pd_reply_event_function;
+    }
+
+  return error;
+}
+
+static uword
+dhcp6_pd_reply_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
+			vlib_frame_t * f)
+{
+  /* These cross the longjmp  boundry (vlib_process_wait_for_event)
+   * and need to be volatile - to prevent them from being optimized into
+   * a register - which could change during suspension */
+
+  while (1)
+    {
+      vlib_process_wait_for_event (vm);
+      uword event_type = DHCP6_PD_DP_REPLY_REPORT;
+      void *event_data = vlib_process_get_event_data (vm, &event_type);
+
+      int i;
+      if (event_type == DHCP6_PD_DP_REPLY_REPORT)
+	{
+	  report_t *events = event_data;
+	  for (i = 0; i < vec_len (events); i++)
+	    {
+	      u32 event_size =
+		sizeof (vl_api_dhcp6_pd_reply_event_t) +
+		vec_len (events[i].prefixes) *
+		sizeof (vl_api_dhcp6_pd_prefix_info_t);
+	      vl_api_dhcp6_pd_reply_event_t *event =
+		clib_mem_alloc (event_size);
+	      memset (event, 0, event_size);
+
+	      event->sw_if_index = htonl (events[i].sw_if_index);
+	      event->server_index = htonl (events[i].server_index);
+	      event->msg_type = events[i].msg_type;
+	      event->T1 = htonl (events[i].T1);
+	      event->T2 = htonl (events[i].T2);
+	      event->inner_status_code = htons (events[i].inner_status_code);
+	      event->status_code = htons (events[i].status_code);
+	      event->preference = events[i].preference;
+
+	      event->n_prefixes = htonl (vec_len (events[i].prefixes));
+	      vl_api_dhcp6_pd_prefix_info_t *prefix =
+		(typeof (prefix)) event->prefixes;
+	      u32 j;
+	      for (j = 0; j < vec_len (events[i].prefixes); j++)
+		{
+		  prefix_info_t *info = &events[i].prefixes[j];
+		  memcpy (prefix->prefix, &info->prefix, 16);
+		  prefix->prefix_length = info->prefix_length;
+		  prefix->valid_time = htonl (info->valid_time);
+		  prefix->preferred_time = htonl (info->preferred_time);
+		  prefix++;
+		}
+
+	      dhcp6_pd_client_public_main_t *dpcpm =
+		&dhcp6_pd_client_public_main;
+	      call_dhcp6_pd_reply_event_callbacks (event, dpcpm->functions);
+
+	      vpe_client_registration_t *reg;
+              /* *INDENT-OFF* */
+              pool_foreach(reg, vpe_api_main.dhcp6_pd_reply_events_registrations,
+              ({
+                vl_api_registration_t *vl_reg;
+                vl_reg =
+                  vl_api_client_index_to_registration (reg->client_index);
+                if (vl_reg && vl_api_can_send_msg (vl_reg))
+                  {
+                    vl_api_dhcp6_pd_reply_event_t *msg =
+                      vl_msg_api_alloc (event_size);
+                    clib_memcpy (msg, event, event_size);
+                    msg->_vl_msg_id = htons (VL_API_DHCP6_PD_REPLY_EVENT);
+                    msg->client_index = reg->client_index;
+                    msg->pid = reg->client_pid;
+                    vl_api_send_msg (vl_reg, (u8 *) msg);
+                  }
+              }));
+              /* *INDENT-ON* */
+
+	      clib_mem_free (event);
+	    }
+	}
+      vlib_process_put_event_data (vm, event_data);
+    }
+
+  return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (dhcp6_pd_reply_process_node, ) = {
+  .function = dhcp6_pd_reply_process,
+  .type = VLIB_NODE_TYPE_PROCESS,
+  .name = "dhcp6-pd-reply-publisher-process",
+};
+/* *INDENT-ON* */
+
+void
+  vl_api_want_dhcp6_pd_reply_events_t_handler
+  (vl_api_want_dhcp6_pd_reply_events_t * mp)
+{
+  vpe_api_main_t *am = &vpe_api_main;
+  vl_api_want_dhcp6_pd_reply_events_reply_t *rmp;
+  int rv = 0;
+
+  uword *p =
+    hash_get (am->dhcp6_pd_reply_events_registration_hash, mp->client_index);
+  vpe_client_registration_t *rp;
+  if (p)
+    {
+      if (mp->enable_disable)
+	{
+	  clib_warning ("pid %d: already enabled...", ntohl (mp->pid));
+	  rv = VNET_API_ERROR_INVALID_REGISTRATION;
+	  goto reply;
+	}
+      else
+	{
+	  rp =
+	    pool_elt_at_index (am->dhcp6_pd_reply_events_registrations, p[0]);
+	  pool_put (am->dhcp6_pd_reply_events_registrations, rp);
+	  hash_unset (am->dhcp6_pd_reply_events_registration_hash,
+		      mp->client_index);
+	  if (pool_elts (am->dhcp6_pd_reply_events_registrations) == 0)
+	    dhcp6_pd_set_publisher_node (~0, REPORT_MAX);
+	  goto reply;
+	}
+    }
+  if (mp->enable_disable == 0)
+    {
+      clib_warning ("pid %d: already disabled...", ntohl (mp->pid));
+      rv = VNET_API_ERROR_INVALID_REGISTRATION;
+      goto reply;
+    }
+  pool_get (am->dhcp6_pd_reply_events_registrations, rp);
+  rp->client_index = mp->client_index;
+  rp->client_pid = ntohl (mp->pid);
+  hash_set (am->dhcp6_pd_reply_events_registration_hash, rp->client_index,
+	    rp - am->dhcp6_pd_reply_events_registrations);
+  dhcp6_pd_set_publisher_node (dhcp6_pd_reply_process_node.index,
+			       DHCP6_PD_DP_REPLY_REPORT);
+
+reply:
+  REPLY_MACRO (VL_API_WANT_DHCP6_PD_REPLY_EVENTS_REPLY);
+}
+
+void
+dhcp6_clients_enable_disable (u8 enable)
+{
+  vlib_main_t *vm = vlib_get_main ();
+
+  if (enable)
+    udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
+			   dhcpv6_pd_client_node.index, 0 /* is_ip6 */ );
+  else
+    udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
+			     0 /* is_ip6 */ );
+}
+
+void
+  vl_api_dhcp6_clients_enable_disable_t_handler
+  (vl_api_dhcp6_clients_enable_disable_t * mp)
+{
+  vl_api_dhcp6_clients_enable_disable_reply_t *rmp;
+  int rv = 0;
+
+  dhcp6_clients_enable_disable (mp->enable);
+
+  REPLY_MACRO (VL_API_WANT_DHCP6_PD_REPLY_EVENTS_REPLY);
+}
+
+static void
+genereate_client_duid (void)
+{
+  client_duid.duid_type = htons (DHCPV6_DUID_LLT);
+  client_duid.hardware_type = htons (1);
+  u32 time_since_2000 = (u32) time (0) - 946684800;
+  client_duid.time = htonl (time_since_2000);
+
+  vnet_main_t *vnm = vnet_get_main ();
+  vnet_interface_main_t *im = &vnm->interface_main;
+  vnet_hw_interface_t *hi;
+  ethernet_interface_t *eth_if = 0;
+
+  /* *INDENT-OFF* */
+  pool_foreach (hi, im->hw_interfaces,
+  ({
+    eth_if = ethernet_get_interface (&ethernet_main, hi->hw_if_index);
+    if (eth_if)
+      break;
+  }));
+  /* *INDENT-ON* */
+
+  if (eth_if)
+    clib_memcpy (client_duid.lla, eth_if->address, 6);
+  else
+    {
+      clib_warning ("Failed to find any Ethernet interface, "
+		    "setting DHCPv6 DUID link-layer address to random value");
+      u32 seed = random_default_seed ();
+      random_u32 (&seed);
+      client_duid.lla[0] = 0xc2;	/* locally administered unicast */
+      client_duid.lla[1] = 0x18;
+      client_duid.lla[2] = 0x44;
+      client_duid.lla[3] = random_u32 (&seed);
+      client_duid.lla[4] = random_u32 (&seed);
+      client_duid.lla[5] = random_u32 (&seed);
+    }
+}
+
+static clib_error_t *
+dhcp6_pd_client_init (vlib_main_t * vm)
+{
+  dhcp6_pd_client_main_t *cm = &dhcp6_pd_client_main;
+
+  cm->vlib_main = vm;
+  cm->vnet_main = vnet_get_main ();
+
+  cm->publisher_node = ~0;
+
+  cm->seed = 0xdeaddabe;
+
+  // TODO: should be stored in non-volatile memory
+  genereate_client_duid ();
+
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (dhcp6_pd_client_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */