src/plugins/dhcp/dhcp6_client_common_dp.c - fdio/vpp - Gitiles

 /*
  * 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 <vnet/ethernet/ethernet.h>
 #include <dhcp/dhcp6_packet.h>
 #include <dhcp/dhcp6_client_common_dp.h>
 #include <dhcp/dhcp6_ia_na_client_dp.h>
 #include <dhcp/dhcp6_pd_client_dp.h>
 #include <dhcp/dhcp6_packet.h>
 #include <vnet/udp/udp.h>

 dhcp6_client_common_main_t dhcp6_client_common_main;
 dhcpv6_duid_ll_string_t client_duid;

 u32
 server_index_get_or_create (u8 * data, u16 len)
 {
   dhcp6_client_common_main_t *ccm = &dhcp6_client_common_main;
   u32 i;
   server_id_t *se;
   server_id_t new_se;

   for (i = 0; i < vec_len (ccm->server_ids); i++)
     {
       se = &ccm->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 (ccm->server_ids, new_se);

   return vec_len (ccm->server_ids) - 1;
 }

 static void
 generate_client_duid (void)
 {
   client_duid.duid_type = clib_host_to_net_u16 (DHCPV6_DUID_LL);
   client_duid.hardware_type = clib_host_to_net_u16 (1);

   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);
     }
 }

 #define foreach_dhcpv6_client \
   _(DROP, "error-drop")       \
   _(LOOKUP, "ip6-lookup")

 typedef enum
 {
 #define _(sym,str) DHCPV6_CLIENT_NEXT_##sym,
   foreach_dhcpv6_client
 #undef _
     DHCPV6_CLIENT_N_NEXT,
 } dhcpv6_client_next_t;

 /**
  * per-packet trace data
  */
 typedef struct dhcpv6_client_trace_t_
 {
 } dhcpv6_client_trace_t;

 static u8 *
 format_dhcpv6_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_client_trace_t *t = va_arg (*args, dhcpv6_client_trace_t *);

   s = format (s, "nothing");

   return s;
 }

 static uword
 dhcpv6_client_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 		       vlib_frame_t * frame)
 {
   dhcp6_ia_na_client_main_t *icm = &dhcp6_ia_na_client_main;
   dhcp6_pd_client_main_t *pcm = &dhcp6_pd_client_main;

   dhcpv6_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;
 	  dhcp6_report_common_t report;
 	  dhcp6_address_info_t *addresses = 0;
 	  dhcp6_prefix_info_t *prefixes = 0;
 	  u32 next0 = DHCPV6_CLIENT_NEXT_DROP;
 	  u32 bi0;
 	  u32 xid;
 	  u32 sw_if_index;
 	  u32 iaid;
 	  u8 client_id_present = 0;
 	  u8 discard = 0;
 	  u8 is_pd_packet = 0;

 	  dhcp6_ia_na_client_state_t *ia_na_client_state = NULL;
 	  dhcp6_pd_client_state_t *pd_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_payload_offset =
 	    (u8 *) dhcpv60 - ((u8 *) ip0 + sizeof (*ip0));
 	  options_length =
 	    clib_net_to_host_u16 (ip0->payload_length) -
 	    dhcpv6_ip6_payload_offset - sizeof (*dhcpv60);

 	  clib_memset (&report, 0, sizeof (report));

 	  sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
 	  if (sw_if_index >= vec_len (icm->client_state_by_sw_if_index))
 	    ia_na_client_state = 0;
 	  else
 	    ia_na_client_state =
 	      &icm->client_state_by_sw_if_index[sw_if_index];
 	  if (sw_if_index >= vec_len (pcm->client_state_by_sw_if_index))
 	    pd_client_state = 0;
 	  else
 	    pd_client_state = &pcm->client_state_by_sw_if_index[sw_if_index];

 	  xid =
 	    (dhcpv60->xid[0] << 16) + (dhcpv60->xid[1] << 8) +
 	    dhcpv60->xid[2];
 	  if (ia_na_client_state && ia_na_client_state->transaction_id == xid)
 	    is_pd_packet = 0;
 	  else if (pd_client_state && pd_client_state->transaction_id == xid)
 	    is_pd_packet = 1;
 	  else
 	    {
 	      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 <
 		      clib_net_to_host_u16 (option->length) +
 		      sizeof (*option))
 		    {
 		      clib_warning
 			("remaining payload length < option length (%d < %d)",
 			 options_length,
 			 clib_net_to_host_u16 (option->length) +
 			 sizeof (*option));
 		      break;
 		    }
 		  u16 oo = clib_net_to_host_u16 (option->option);
 		  if (oo == DHCPV6_OPTION_IA_NA || oo == DHCPV6_OPTION_IA_PD)
 		    {
 		      u8 discard_option = 0;
 		      dhcpv6_ia_header_t *ia_header = (void *) option;
 		      iaid = clib_net_to_host_u32 (ia_header->iaid);
 		      u32 T1 = clib_net_to_host_u32 (ia_header->t1);
 		      u32 T2 = clib_net_to_host_u32 (ia_header->t2);
 		      if (iaid != DHCPV6_CLIENT_IAID)
 			discard_option = 1;
 		      if (T1 != 0 && T2 != 0 && T1 > T2)
 			discard_option = 1;
 		      if (!discard_option)
 			{
 			  report.T1 = T1;
 			  report.T2 = T2;
 			}
 		      dhcpv6_option_t *inner_option =
 			(void *) ia_header->data;
 		      u16 inner_options_length =
 			clib_net_to_host_u16 (option->length) -
 			(sizeof (*ia_header) - sizeof (dhcpv6_option_t));
 		      while (inner_options_length > 0)
 			{
 			  u16 inner_oo =
 			    clib_net_to_host_u16 (inner_option->option);
 			  if (discard_option)
 			    ;
 			  else if (inner_oo == DHCPV6_OPTION_IAADDR)
 			    {
 			      dhcpv6_ia_opt_addr_t *iaaddr =
 				(void *) inner_option;
 			      u32 n_addresses = vec_len (addresses);
 			      vec_validate (addresses, n_addresses);
 			      dhcp6_address_info_t *address_info =
 				&addresses[n_addresses];
 			      address_info->preferred_time =
 				clib_net_to_host_u32 (iaaddr->preferred);
 			      address_info->valid_time =
 				clib_net_to_host_u32 (iaaddr->valid);
 			      address_info->address = iaaddr->addr;
 			    }
 			  else if (inner_oo == DHCPV6_OPTION_IAPREFIX)
 			    {
 			      dhcpv6_ia_opt_pd_t *iaprefix =
 				(void *) inner_option;
 			      u32 n_prefixes = vec_len (prefixes);
 			      vec_validate (prefixes, n_prefixes);
 			      dhcp6_prefix_info_t *prefix_info =
 				&prefixes[n_prefixes];
 			      prefix_info->preferred_time =
 				clib_net_to_host_u32 (iaprefix->preferred);
 			      prefix_info->valid_time =
 				clib_net_to_host_u32 (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 =
 				clib_net_to_host_u16 (sc->status_code);
 			    }
 			  inner_options_length -=
 			    sizeof (*inner_option) +
 			    clib_net_to_host_u16 (inner_option->length);
 			  inner_option =
 			    (void *) ((u8 *) inner_option +
 				      sizeof (*inner_option) +
 				      clib_net_to_host_u16
 				      (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 = clib_net_to_host_u16 (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
 			{
 			  u16 ol = clib_net_to_host_u16 (option->length);
 			  if (ol - 2 /* 2 byte DUID type code */  > 128)
 			    {
 			      clib_warning
 				("Server DUID (without type code) is longer than 128 octets");
 			      discard = 1;
 			    }
 			  else
 			    {
 			      report.server_index =
 				server_index_get_or_create (option->data, ol);
 			    }
 			}
 		    }
 		  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 =
 			clib_net_to_host_u16 (sc->status_code);
 		    }
 		  options_length -=
 		    sizeof (*option) + clib_net_to_host_u16 (option->length);
 		  option =
 		    (void *) ((u8 *) option + sizeof (*option) +
 			      clib_net_to_host_u16 (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)
 		{
 		  if (!is_pd_packet)
 		    {
 		      address_report_t r;
 		      r.body = report;
 		      r.n_addresses = vec_len (addresses);
 		      r.addresses = addresses;
 		      dhcp6_publish_report (&r);
 		      /* We just gave addresses to another process! */
 		      addresses = 0;
 		    }
 		  else
 		    {
 		      prefix_report_t r;
 		      r.body = report;
 		      r.n_prefixes = vec_len (prefixes);
 		      r.prefixes = prefixes;
 		      dhcp6_pd_publish_report (&r);
 		      /* We just gave prefixes to another process! */
 		      prefixes = 0;
 		    }
 		}
 	      vec_free (addresses);
 	      vec_free (prefixes);

 	      break;
 	    default:
 	      break;
 	    }

 	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 	    {
 	      dhcpv6_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_client_node, static) = {
     .function = dhcpv6_client_node_fn,
     .name = "dhcpv6-client",
     .vector_size = sizeof (u32),

     .n_errors = 0,

     .n_next_nodes = DHCPV6_CLIENT_N_NEXT,
     .next_nodes = {
   #define _(s,n) [DHCPV6_CLIENT_NEXT_##s] = n,
       foreach_dhcpv6_client
   #undef _
     },

     .format_trace = format_dhcpv6_client_trace,
 };
 /* *INDENT-ON* */

 void
 dhcp6_clients_enable_disable (u8 enable)
 {
   vlib_main_t *vm = vlib_get_main ();

   if (enable)
     {
       if (client_duid.duid_type == 0)
 	generate_client_duid ();
       udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
 			     dhcpv6_client_node.index, 0 /* is_ip6 */ );
     }
   else
     udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
 			     0 /* is_ip6 */ );
 }

 /*
  * fd.io coding-style-patch-verification: ON
  *
  * Local Variables:
  * eval: (c-set-style "gnu")
  * End:
  */
	/*
	* 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 <vnet/ethernet/ethernet.h>
	#include <dhcp/dhcp6_packet.h>
	#include <dhcp/dhcp6_client_common_dp.h>
	#include <dhcp/dhcp6_ia_na_client_dp.h>
	#include <dhcp/dhcp6_pd_client_dp.h>
	#include <dhcp/dhcp6_packet.h>
	#include <vnet/udp/udp.h>

	dhcp6_client_common_main_t dhcp6_client_common_main;
	dhcpv6_duid_ll_string_t client_duid;

	u32
	server_index_get_or_create (u8 * data, u16 len)
	{
	dhcp6_client_common_main_t *ccm = &dhcp6_client_common_main;
	u32 i;
	server_id_t *se;
	server_id_t new_se;

	for (i = 0; i < vec_len (ccm->server_ids); i++)
	{
	se = &ccm->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 (ccm->server_ids, new_se);

	return vec_len (ccm->server_ids) - 1;
	}

	static void
	generate_client_duid (void)
	{
	client_duid.duid_type = clib_host_to_net_u16 (DHCPV6_DUID_LL);
	client_duid.hardware_type = clib_host_to_net_u16 (1);

	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);
	}
	}

	#define foreach_dhcpv6_client \
	_(DROP, "error-drop") \
	_(LOOKUP, "ip6-lookup")

	typedef enum
	{
	#define _(sym,str) DHCPV6_CLIENT_NEXT_##sym,
	foreach_dhcpv6_client
	#undef _
	DHCPV6_CLIENT_N_NEXT,
	} dhcpv6_client_next_t;

	/**
	* per-packet trace data
	*/
	typedef struct dhcpv6_client_trace_t_
	{
	} dhcpv6_client_trace_t;

	static u8 *
	format_dhcpv6_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_client_trace_t t = va_arg (args, dhcpv6_client_trace_t *);

	s = format (s, "nothing");

	return s;
	}

	static uword
	dhcpv6_client_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
	vlib_frame_t * frame)
	{
	dhcp6_ia_na_client_main_t *icm = &dhcp6_ia_na_client_main;
	dhcp6_pd_client_main_t *pcm = &dhcp6_pd_client_main;

	dhcpv6_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;
	dhcp6_report_common_t report;
	dhcp6_address_info_t *addresses = 0;
	dhcp6_prefix_info_t *prefixes = 0;
	u32 next0 = DHCPV6_CLIENT_NEXT_DROP;
	u32 bi0;
	u32 xid;
	u32 sw_if_index;
	u32 iaid;
	u8 client_id_present = 0;
	u8 discard = 0;
	u8 is_pd_packet = 0;

	dhcp6_ia_na_client_state_t *ia_na_client_state = NULL;
	dhcp6_pd_client_state_t *pd_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_payload_offset =
	(u8 ) dhcpv60 - ((u8 ) ip0 + sizeof (*ip0));
	options_length =
	clib_net_to_host_u16 (ip0->payload_length) -
	dhcpv6_ip6_payload_offset - sizeof (*dhcpv60);

	clib_memset (&report, 0, sizeof (report));

	sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
	if (sw_if_index >= vec_len (icm->client_state_by_sw_if_index))
	ia_na_client_state = 0;
	else
	ia_na_client_state =
	&icm->client_state_by_sw_if_index[sw_if_index];
	if (sw_if_index >= vec_len (pcm->client_state_by_sw_if_index))
	pd_client_state = 0;
	else
	pd_client_state = &pcm->client_state_by_sw_if_index[sw_if_index];

	xid =
	(dhcpv60->xid[0] << 16) + (dhcpv60->xid[1] << 8) +
	dhcpv60->xid[2];
	if (ia_na_client_state && ia_na_client_state->transaction_id == xid)
	is_pd_packet = 0;
	else if (pd_client_state && pd_client_state->transaction_id == xid)
	is_pd_packet = 1;
	else
	{
	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 <
	clib_net_to_host_u16 (option->length) +
	sizeof (*option))
	{
	clib_warning
	("remaining payload length < option length (%d < %d)",
	options_length,
	clib_net_to_host_u16 (option->length) +
	sizeof (*option));
	break;
	}
	u16 oo = clib_net_to_host_u16 (option->option);
	if (oo == DHCPV6_OPTION_IA_NA \|\| oo == DHCPV6_OPTION_IA_PD)
	{
	u8 discard_option = 0;
	dhcpv6_ia_header_t ia_header = (void ) option;
	iaid = clib_net_to_host_u32 (ia_header->iaid);
	u32 T1 = clib_net_to_host_u32 (ia_header->t1);
	u32 T2 = clib_net_to_host_u32 (ia_header->t2);
	if (iaid != DHCPV6_CLIENT_IAID)
	discard_option = 1;
	if (T1 != 0 && T2 != 0 && T1 > T2)
	discard_option = 1;
	if (!discard_option)
	{
	report.T1 = T1;
	report.T2 = T2;
	}
	dhcpv6_option_t *inner_option =
	(void *) ia_header->data;
	u16 inner_options_length =
	clib_net_to_host_u16 (option->length) -
	(sizeof (*ia_header) - sizeof (dhcpv6_option_t));
	while (inner_options_length > 0)
	{
	u16 inner_oo =
	clib_net_to_host_u16 (inner_option->option);
	if (discard_option)
	;
	else if (inner_oo == DHCPV6_OPTION_IAADDR)
	{
	dhcpv6_ia_opt_addr_t *iaaddr =
	(void *) inner_option;
	u32 n_addresses = vec_len (addresses);
	vec_validate (addresses, n_addresses);
	dhcp6_address_info_t *address_info =
	&addresses[n_addresses];
	address_info->preferred_time =
	clib_net_to_host_u32 (iaaddr->preferred);
	address_info->valid_time =
	clib_net_to_host_u32 (iaaddr->valid);
	address_info->address = iaaddr->addr;
	}
	else if (inner_oo == DHCPV6_OPTION_IAPREFIX)
	{
	dhcpv6_ia_opt_pd_t *iaprefix =
	(void *) inner_option;
	u32 n_prefixes = vec_len (prefixes);
	vec_validate (prefixes, n_prefixes);
	dhcp6_prefix_info_t *prefix_info =
	&prefixes[n_prefixes];
	prefix_info->preferred_time =
	clib_net_to_host_u32 (iaprefix->preferred);
	prefix_info->valid_time =
	clib_net_to_host_u32 (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 =
	clib_net_to_host_u16 (sc->status_code);
	}
	inner_options_length -=
	sizeof (*inner_option) +
	clib_net_to_host_u16 (inner_option->length);
	inner_option =
	(void ) ((u8 ) inner_option +
	sizeof (*inner_option) +
	clib_net_to_host_u16
	(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 = clib_net_to_host_u16 (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
	{
	u16 ol = clib_net_to_host_u16 (option->length);
	if (ol - 2 /* 2 byte DUID type code */ > 128)
	{
	clib_warning
	("Server DUID (without type code) is longer than 128 octets");
	discard = 1;
	}
	else
	{
	report.server_index =
	server_index_get_or_create (option->data, ol);
	}
	}
	}
	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 =
	clib_net_to_host_u16 (sc->status_code);
	}
	options_length -=
	sizeof (*option) + clib_net_to_host_u16 (option->length);
	option =
	(void ) ((u8 ) option + sizeof (*option) +
	clib_net_to_host_u16 (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)
	{
	if (!is_pd_packet)
	{
	address_report_t r;
	r.body = report;
	r.n_addresses = vec_len (addresses);
	r.addresses = addresses;
	dhcp6_publish_report (&r);
	/* We just gave addresses to another process! */
	addresses = 0;
	}
	else
	{
	prefix_report_t r;
	r.body = report;
	r.n_prefixes = vec_len (prefixes);
	r.prefixes = prefixes;
	dhcp6_pd_publish_report (&r);
	/* We just gave prefixes to another process! */
	prefixes = 0;
	}
	}
	vec_free (addresses);
	vec_free (prefixes);

	break;
	default:
	break;
	}

	if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
	{
	dhcpv6_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_client_node, static) = {
	.function = dhcpv6_client_node_fn,
	.name = "dhcpv6-client",
	.vector_size = sizeof (u32),

	.n_errors = 0,

	.n_next_nodes = DHCPV6_CLIENT_N_NEXT,
	.next_nodes = {
	#define _(s,n) [DHCPV6_CLIENT_NEXT_##s] = n,
	foreach_dhcpv6_client
	#undef _
	},

	.format_trace = format_dhcpv6_client_trace,
	};
	/* INDENT-ON */

	void
	dhcp6_clients_enable_disable (u8 enable)
	{
	vlib_main_t *vm = vlib_get_main ();

	if (enable)
	{
	if (client_duid.duid_type == 0)
	generate_client_duid ();
	udp_register_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
	dhcpv6_client_node.index, 0 /* is_ip6 */ );
	}
	else
	udp_unregister_dst_port (vm, UDP_DST_PORT_dhcpv6_to_client,
	0 /* is_ip6 */ );
	}

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