dhcp: Move to plugin

Type: feature

Change-Id: I3fe27a8ef577741d9a5c4f090ec91cf68fb44fe3
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 0 insertions, 1255 deletions

diff --git a/src/vnet/dhcp/client.c b/src/vnet/dhcp/client.c
deleted file mode 100644
index aaeda96327d..00000000000
--- a/src/vnet/dhcp/client.c
+++ /dev/null
@@ -1,1255 +0,0 @@
-/*
- * Copyright (c) 2015 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 <vlibmemory/api.h>
-#include <vnet/dhcp/client.h>
-#include <vnet/dhcp/dhcp_proxy.h>
-#include <vnet/fib/fib_table.h>
-#include <vnet/qos/qos_types.h>
-
-dhcp_client_main_t dhcp_client_main;
-static u8 *format_dhcp_client_state (u8 * s, va_list * va);
-static vlib_node_registration_t dhcp_client_process_node;
-
-#define foreach_dhcp_sent_packet_stat           \
-_(DISCOVER, "DHCP discover packets sent")       \
-_(OFFER, "DHCP offer packets sent")             \
-_(REQUEST, "DHCP request packets sent")         \
-_(ACK, "DHCP ack packets sent")
-
-#define foreach_dhcp_error_counter                                      \
-_(NOT_FOR_US, "DHCP packets for other hosts, dropped")                  \
-_(NAK, "DHCP nak packets received")                                     \
-_(NON_OFFER_DISCOVER, "DHCP non-offer packets in discover state")       \
-_(ODDBALL, "DHCP non-ack, non-offer packets received")                  \
-_(BOUND, "DHCP bind success")
-
-typedef enum
-{
-#define _(sym,str) DHCP_STAT_##sym,
-  foreach_dhcp_sent_packet_stat foreach_dhcp_error_counter
-#undef _
-    DHCP_STAT_UNKNOWN,
-  DHCP_STAT_N_STAT,
-} sample_error_t;
-
-static char *dhcp_client_process_stat_strings[] = {
-#define _(sym,string) string,
-  foreach_dhcp_sent_packet_stat foreach_dhcp_error_counter
-#undef _
-    "DHCP unknown packets sent",
-};
-
-static void
-dhcp_client_acquire_address (dhcp_client_main_t * dcm, dhcp_client_t * c)
-{
-  /*
-   * Install any/all info gleaned from dhcp, right here
-   */
-  ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index,
-				 (void *) &c->leased_address,
-				 c->subnet_mask_width, 0 /*is_del */ );
-}
-
-static void
-dhcp_client_release_address (dhcp_client_main_t * dcm, dhcp_client_t * c)
-{
-  /*
-   * Remove any/all info gleaned from dhcp, right here. Caller(s)
-   * have not wiped out the info yet.
-   */
-
-  ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index,
-				 (void *) &c->leased_address,
-				 c->subnet_mask_width, 1 /*is_del */ );
-}
-
-static void
-dhcp_client_proc_callback (uword * client_index)
-{
-  vlib_main_t *vm = vlib_get_main ();
-  ASSERT (vlib_get_thread_index () == 0);
-  vlib_process_signal_event (vm, dhcp_client_process_node.index,
-			     EVENT_DHCP_CLIENT_WAKEUP, *client_index);
-}
-
-static void
-dhcp_client_addr_callback (dhcp_client_t * c)
-{
-  dhcp_client_main_t *dcm = &dhcp_client_main;
-
-  /* disable the feature */
-  vnet_feature_enable_disable ("ip4-unicast",
-			       "ip4-dhcp-client-detect",
-			       c->sw_if_index, 0 /* disable */ , 0, 0);
-  c->client_detect_feature_enabled = 0;
-
-  /* if renewing the lease, the address and route have already been added */
-  if (c->state == DHCP_BOUND)
-    return;
-
-  /* add the address to the interface */
-  dhcp_client_acquire_address (dcm, c);
-
-  /*
-   * Configure default IP route:
-   */
-  if (c->router_address.as_u32)
-    {
-      fib_prefix_t all_0s = {
-	.fp_len = 0,
-	.fp_addr.ip4.as_u32 = 0x0,
-	.fp_proto = FIB_PROTOCOL_IP4,
-      };
-      ip46_address_t nh = {
-	.ip4 = c->router_address,
-      };
-
-      /* *INDENT-OFF* */
-      fib_table_entry_path_add (
-	fib_table_get_index_for_sw_if_index (
-	  FIB_PROTOCOL_IP4,
-	  c->sw_if_index),
-	  &all_0s,
-	  FIB_SOURCE_DHCP,
-	  FIB_ENTRY_FLAG_NONE,
-          DPO_PROTO_IP4,
-          &nh, c->sw_if_index,
-          ~0, 1, NULL,	// no label stack
-          FIB_ROUTE_PATH_FLAG_NONE);
-      /* *INDENT-ON* */
-    }
-  if (c->dhcp_server.as_u32)
-    {
-      ip46_address_t dst = {
-	.ip4 = c->dhcp_server,
-      };
-      c->ai_ucast = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
-					 VNET_LINK_IP4, &dst, c->sw_if_index);
-    }
-
-  /*
-   * Call the user's event callback to report DHCP information
-   */
-  if (c->event_callback)
-    c->event_callback (c->client_index, c);
-}
-
-/*
- * dhcp_client_for_us - server-to-client callback.
- * Called from proxy_node.c:dhcp_proxy_to_client_input().
- * This function first decides that the packet in question is
- * actually for the dhcp client code in case we're also acting as
- * a dhcp proxy. Ay caramba, what a folly!
- */
-int
-dhcp_client_for_us (u32 bi, vlib_buffer_t * b,
-		    ip4_header_t * ip,
-		    udp_header_t * udp, dhcp_header_t * dhcp)
-{
-  dhcp_client_main_t *dcm = &dhcp_client_main;
-  vlib_main_t *vm = dcm->vlib_main;
-  dhcp_client_t *c;
-  uword *p;
-  f64 now = vlib_time_now (dcm->vlib_main);
-  u8 dhcp_message_type = 0;
-  dhcp_option_t *o;
-
-  /*
-   * Doing dhcp client on this interface?
-   * Presumably we will always receive dhcp clnt for-us pkts on
-   * the interface that's asking for an address.
-   */
-  p = hash_get (dcm->client_by_sw_if_index,
-		vnet_buffer (b)->sw_if_index[VLIB_RX]);
-  if (p == 0)
-    return 0;			/* no */
-
-  c = pool_elt_at_index (dcm->clients, p[0]);
-
-  /* Mixing dhcp relay and dhcp proxy? DGMS... */
-  if (c->state == DHCP_BOUND && c->retry_count == 0)
-    return 0;
-
-  /* Packet not for us? Turf it... */
-  if (memcmp (dhcp->client_hardware_address, c->client_hardware_address,
-	      sizeof (c->client_hardware_address)))
-    {
-      vlib_node_increment_counter (vm, dhcp_client_process_node.index,
-				   DHCP_STAT_NOT_FOR_US, 1);
-      return 0;
-    }
-
-  /* parse through the packet, learn what we can */
-  if (dhcp->your_ip_address.as_u32)
-    c->leased_address.as_u32 = dhcp->your_ip_address.as_u32;
-
-  c->dhcp_server.as_u32 = dhcp->server_ip_address.as_u32;
-
-  o = (dhcp_option_t *) dhcp->options;
-
-  while (o->option != 0xFF /* end of options */  &&
-	 (u8 *) o < (b->data + b->current_data + b->current_length))
-    {
-      switch (o->option)
-	{
-	case 53:		/* dhcp message type */
-	  dhcp_message_type = o->data[0];
-	  break;
-
-	case 51:		/* lease time */
-	  {
-	    u32 lease_time_in_seconds =
-	      clib_host_to_net_u32 (o->data_as_u32[0]);
-	    // for debug: lease_time_in_seconds = 20; /*$$$$*/
-	    c->lease_expires = now + (f64) lease_time_in_seconds;
-	    c->lease_lifetime = lease_time_in_seconds;
-	    /* Set a sensible default, in case we don't get opt 58 */
-	    c->lease_renewal_interval = lease_time_in_seconds / 2;
-	  }
-	  break;
-
-	case 58:		/* lease renew time in seconds */
-	  {
-	    u32 lease_renew_time_in_seconds =
-	      clib_host_to_net_u32 (o->data_as_u32[0]);
-	    c->lease_renewal_interval = lease_renew_time_in_seconds;
-	  }
-	  break;
-
-	case 54:		/* dhcp server address */
-	  c->dhcp_server.as_u32 = o->data_as_u32[0];
-	  break;
-
-	case 1:		/* subnet mask */
-	  {
-	    u32 subnet_mask = clib_host_to_net_u32 (o->data_as_u32[0]);
-	    c->subnet_mask_width = count_set_bits (subnet_mask);
-	  }
-	  break;
-	case 3:		/* router address */
-	  {
-	    u32 router_address = o->data_as_u32[0];
-	    c->router_address.as_u32 = router_address;
-	  }
-	  break;
-	case 6:		/* domain server address */
-	  {
-	    vec_free (c->domain_server_address);
-	    vec_validate (c->domain_server_address,
-			  o->length / sizeof (ip4_address_t) - 1);
-	    clib_memcpy (c->domain_server_address, o->data, o->length);
-	  }
-	  break;
-	case 12:		/* hostname */
-	  {
-	    /* Replace the existing hostname if necessary */
-	    vec_free (c->hostname);
-	    vec_validate (c->hostname, o->length - 1);
-	    clib_memcpy (c->hostname, o->data, o->length);
-	  }
-	  break;
-
-	  /* $$$$ Your message in this space, parse more options */
-	default:
-	  break;
-	}
-
-      o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
-    }
-
-  switch (c->state)
-    {
-    case DHCP_DISCOVER:
-      if (dhcp_message_type != DHCP_PACKET_OFFER)
-	{
-	  vlib_node_increment_counter (vm, dhcp_client_process_node.index,
-				       DHCP_STAT_NON_OFFER_DISCOVER, 1);
-	  c->next_transmit = now + 5.0;
-	  break;
-	}
-
-      /* Received an offer, go send a request */
-      c->state = DHCP_REQUEST;
-      c->retry_count = 0;
-      c->next_transmit = 0;	/* send right now... */
-      /* Poke the client process, which will send the request */
-      uword client_id = c - dcm->clients;
-      vl_api_rpc_call_main_thread (dhcp_client_proc_callback,
-				   (u8 *) & client_id, sizeof (uword));
-      break;
-
-    case DHCP_BOUND:
-    case DHCP_REQUEST:
-      if (dhcp_message_type == DHCP_PACKET_NAK)
-	{
-	  vlib_node_increment_counter (vm, dhcp_client_process_node.index,
-				       DHCP_STAT_NAK, 1);
-	  /* Probably never happens in bound state, but anyhow... */
-	  if (c->state == DHCP_BOUND)
-	    {
-	      ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index,
-					     (void *) &c->leased_address,
-					     c->subnet_mask_width,
-					     1 /*is_del */ );
-	      vnet_feature_enable_disable ("ip4-unicast",
-					   "ip4-dhcp-client-detect",
-					   c->sw_if_index, 1 /* enable */ ,
-					   0, 0);
-	      c->client_detect_feature_enabled = 1;
-	    }
-	  /* Wipe out any memory of the address we had... */
-	  c->state = DHCP_DISCOVER;
-	  c->next_transmit = now;
-	  c->retry_count = 0;
-	  c->leased_address.as_u32 = 0;
-	  c->subnet_mask_width = 0;
-	  c->router_address.as_u32 = 0;
-	  c->lease_renewal_interval = 0;
-	  c->dhcp_server.as_u32 = 0;
-	  vec_free (c->domain_server_address);
-	  break;
-	}
-
-      if (dhcp_message_type != DHCP_PACKET_ACK &&
-	  dhcp_message_type != DHCP_PACKET_OFFER)
-	{
-	  vlib_node_increment_counter (vm, dhcp_client_process_node.index,
-				       DHCP_STAT_NON_OFFER_DISCOVER, 1);
-	  clib_warning ("sw_if_index %d state %U message type %d",
-			c->sw_if_index, format_dhcp_client_state,
-			c->state, dhcp_message_type);
-	  c->next_transmit = now + 5.0;
-	  break;
-	}
-      /* OK, we own the address (etc), add to the routing table(s) */
-      vl_api_rpc_call_main_thread (dhcp_client_addr_callback,
-				   (u8 *) c, sizeof (*c));
-
-      c->state = DHCP_BOUND;
-      c->retry_count = 0;
-      c->next_transmit = now + (f64) c->lease_renewal_interval;
-      c->lease_expires = now + (f64) c->lease_lifetime;
-      vlib_node_increment_counter (vm, dhcp_client_process_node.index,
-				   DHCP_STAT_BOUND, 1);
-      break;
-
-    default:
-      clib_warning ("client %d bogus state %d", c - dcm->clients, c->state);
-      break;
-    }
-
-  /* drop the pkt, return 1 */
-  vlib_buffer_free (vm, &bi, 1);
-  return 1;
-}
-
-static void
-send_dhcp_pkt (dhcp_client_main_t * dcm, dhcp_client_t * c,
-	       dhcp_packet_type_t type, int is_broadcast)
-{
-  vlib_main_t *vm = dcm->vlib_main;
-  vnet_main_t *vnm = dcm->vnet_main;
-  vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (vnm, c->sw_if_index);
-  vnet_sw_interface_t *sup_sw
-    = vnet_get_sup_sw_interface (vnm, c->sw_if_index);
-  vnet_sw_interface_t *sw = vnet_get_sw_interface (vnm, c->sw_if_index);
-  vlib_buffer_t *b;
-  u32 bi;
-  ip4_header_t *ip;
-  udp_header_t *udp;
-  dhcp_header_t *dhcp;
-  u32 *to_next;
-  vlib_frame_t *f;
-  dhcp_option_t *o;
-  u16 udp_length, ip_length;
-  u32 counter_index, node_index;
-
-  /* Interface(s) down? */
-  if ((hw->flags & VNET_HW_INTERFACE_FLAG_LINK_UP) == 0)
-    return;
-  if ((sup_sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0)
-    return;
-  if ((sw->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0)
-    return;
-
-  if (vlib_buffer_alloc (vm, &bi, 1) != 1)
-    {
-      clib_warning ("buffer allocation failure");
-      c->next_transmit = 0;
-      return;
-    }
-
-  /* Build a dhcpv4 pkt from whole cloth */
-  b = vlib_get_buffer (vm, bi);
-  VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b);
-
-  ASSERT (b->current_data == 0);
-
-  vnet_buffer (b)->sw_if_index[VLIB_RX] = c->sw_if_index;
-
-  if (is_broadcast)
-    {
-      node_index = ip4_rewrite_node.index;
-      vnet_buffer (b)->ip.adj_index[VLIB_TX] = c->ai_bcast;
-    }
-  else
-    {
-      ip_adjacency_t *adj = adj_get (c->ai_ucast);
-
-      if (IP_LOOKUP_NEXT_ARP == adj->lookup_next_index)
-	node_index = ip4_arp_node.index;
-      else
-	node_index = ip4_rewrite_node.index;
-      vnet_buffer (b)->ip.adj_index[VLIB_TX] = c->ai_ucast;
-    }
-
-  /* Enqueue the packet right now */
-  f = vlib_get_frame_to_node (vm, node_index);
-  to_next = vlib_frame_vector_args (f);
-  to_next[0] = bi;
-  f->n_vectors = 1;
-  vlib_put_frame_to_node (vm, node_index, f);
-
-  /* build the headers */
-  ip = vlib_buffer_get_current (b);
-  udp = (udp_header_t *) (ip + 1);
-  dhcp = (dhcp_header_t *) (udp + 1);
-
-  /* $$$ optimize, maybe */
-  clib_memset (ip, 0, sizeof (*ip) + sizeof (*udp) + sizeof (*dhcp));
-
-  ip->ip_version_and_header_length = 0x45;
-  ip->ttl = 128;
-  ip->protocol = IP_PROTOCOL_UDP;
-
-  ip->tos = c->dscp;
-
-  if (ip->tos)
-    {
-      /*
-       * Setup the buffer's QoS settings so any QoS marker on the egress
-       * interface, that might set VLAN CoS bits, based on this DSCP setting
-       */
-      vnet_buffer2 (b)->qos.source = QOS_SOURCE_IP;
-      vnet_buffer2 (b)->qos.bits = ip->tos;
-      b->flags |= VNET_BUFFER_F_QOS_DATA_VALID;
-    }
-
-  if (is_broadcast)
-    {
-      /* src = 0.0.0.0, dst = 255.255.255.255 */
-      ip->dst_address.as_u32 = ~0;
-    }
-  else
-    {
-      /* Renewing an active lease, plain old ip4 src/dst */
-      ip->src_address.as_u32 = c->leased_address.as_u32;
-      ip->dst_address.as_u32 = c->dhcp_server.as_u32;
-    }
-
-  udp->src_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client);
-  udp->dst_port = clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server);
-
-  /* Send the interface MAC address */
-  clib_memcpy (dhcp->client_hardware_address,
-	       vnet_sw_interface_get_hw_address (vnm, c->sw_if_index), 6);
-
-  /* And remember it for rx-packet-for-us checking */
-  clib_memcpy (c->client_hardware_address, dhcp->client_hardware_address,
-	       sizeof (c->client_hardware_address));
-
-  /* Lease renewal, set up client_ip_address */
-  if (is_broadcast == 0)
-    dhcp->client_ip_address.as_u32 = c->leased_address.as_u32;
-
-  dhcp->opcode = 1;		/* request, all we send */
-  dhcp->hardware_type = 1;	/* ethernet */
-  dhcp->hardware_address_length = 6;
-  dhcp->transaction_identifier = c->transaction_id;
-  dhcp->flags =
-    clib_host_to_net_u16 (is_broadcast && c->set_broadcast_flag ?
-			  DHCP_FLAG_BROADCAST : 0);
-  dhcp->magic_cookie.as_u32 = DHCP_MAGIC;
-
-  o = (dhcp_option_t *) dhcp->options;
-
-  /* Send option 53, the DHCP message type */
-  o->option = DHCP_PACKET_OPTION_MSG_TYPE;
-  o->length = 1;
-  o->data[0] = type;
-  o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
-
-  /* Send option 57, max msg length */
-  if (0 /* not needed, apparently */ )
-    {
-      o->option = 57;
-      o->length = 2;
-      {
-	u16 *o2 = (u16 *) o->data;
-	*o2 = clib_host_to_net_u16 (1152);
-	o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
-      }
-    }
-
-  /*
-   * If server ip address is available with non-zero value,
-   * option 54 (DHCP Server Identifier) is sent.
-   */
-  if (c->dhcp_server.as_u32)
-    {
-      o->option = 54;
-      o->length = 4;
-      clib_memcpy (o->data, &c->dhcp_server.as_u32, 4);
-      o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
-    }
-
-  /* send option 50, requested IP address */
-  if (c->leased_address.as_u32)
-    {
-      o->option = 50;
-      o->length = 4;
-      clib_memcpy (o->data, &c->leased_address.as_u32, 4);
-      o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
-    }
-
-  /* send option 12, host name */
-  if (vec_len (c->hostname))
-    {
-      o->option = 12;
-      o->length = vec_len (c->hostname);
-      clib_memcpy (o->data, c->hostname, vec_len (c->hostname));
-      o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
-    }
-
-  /* send option 61, client_id */
-  if (vec_len (c->client_identifier))
-    {
-      o->option = 61;
-      o->length = vec_len (c->client_identifier);
-      clib_memcpy (o->data, c->client_identifier,
-		   vec_len (c->client_identifier));
-      o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
-    }
-
-  /* $$ maybe send the client s/w version if anyone cares */
-
-  /*
-   * send option 55, parameter request list
-   * The current list - see below, matches the Linux dhcp client's list
-   * Any specific dhcp server config and/or dhcp server may or may
-   * not yield specific options.
-   */
-  o->option = 55;
-  o->length = vec_len (c->option_55_data);
-  clib_memcpy (o->data, c->option_55_data, vec_len (c->option_55_data));
-  o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
-
-  /* End of list */
-  o->option = 0xff;
-  o->length = 0;
-  o++;
-
-  b->current_length = ((u8 *) o) - b->data;
-
-  /* fix ip length, checksum and udp length */
-  ip_length = vlib_buffer_length_in_chain (vm, b);
-
-  ip->length = clib_host_to_net_u16 (ip_length);
-  ip->checksum = ip4_header_checksum (ip);
-
-  udp_length = ip_length - (sizeof (*ip));
-  udp->length = clib_host_to_net_u16 (udp_length);
-
-  switch (type)
-    {
-#define _(a,b) case DHCP_PACKET_##a: {counter_index = DHCP_STAT_##a; break;}
-      foreach_dhcp_sent_packet_stat
-#undef _
-    default:
-      counter_index = DHCP_STAT_UNKNOWN;
-      break;
-    }
-
-  vlib_node_increment_counter (vm, dhcp_client_process_node.index,
-			       counter_index, 1);
-}
-
-static int
-dhcp_discover_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now)
-{
-  /*
-   * State machine "DISCOVER" state. Send a dhcp discover packet,
-   * eventually back off the retry rate.
-   */
-
-  if (c->client_detect_feature_enabled == 0)
-    {
-      vnet_feature_enable_disable ("ip4-unicast",
-				   "ip4-dhcp-client-detect",
-				   c->sw_if_index, 1 /* enable */ , 0, 0);
-      c->client_detect_feature_enabled = 1;
-    }
-
-  send_dhcp_pkt (dcm, c, DHCP_PACKET_DISCOVER, 1 /* is_broadcast */ );
-
-  c->retry_count++;
-  if (c->retry_count > 10)
-    c->next_transmit = now + 5.0;
-  else
-    c->next_transmit = now + 1.0;
-  return 0;
-}
-
-static int
-dhcp_request_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now)
-{
-  /*
-   * State machine "REQUEST" state. Send a dhcp request packet,
-   * eventually drop back to the discover state.
-   */
-  send_dhcp_pkt (dcm, c, DHCP_PACKET_REQUEST, 1 /* is_broadcast */ );
-
-  c->retry_count++;
-  if (c->retry_count > 7 /* lucky you */ )
-    {
-      c->state = DHCP_DISCOVER;
-      c->next_transmit = now;
-      c->retry_count = 0;
-      return 1;
-    }
-  c->next_transmit = now + 1.0;
-  return 0;
-}
-
-static int
-dhcp_bound_state (dhcp_client_main_t * dcm, dhcp_client_t * c, f64 now)
-{
-  /*
-   * State machine "BOUND" state. Send a dhcp request packet to renew
-   * the lease.
-   * Eventually, when the lease expires, forget the dhcp data
-   * and go back to the stone age.
-   */
-
-  /*
-   * We disable the client detect feature when we bind a
-   * DHCP address. Turn it back on again on first renew attempt.
-   * Otherwise, if the DHCP server replies we'll never see it.
-   */
-  if (c->client_detect_feature_enabled == 0)
-    {
-      vnet_feature_enable_disable ("ip4-unicast",
-				   "ip4-dhcp-client-detect",
-				   c->sw_if_index, 1 /* enable */ , 0, 0);
-      c->client_detect_feature_enabled = 1;
-    }
-
-  send_dhcp_pkt (dcm, c, DHCP_PACKET_REQUEST, 0 /* is_broadcast */ );
-
-  c->retry_count++;
-  if (c->retry_count > 10)
-    c->next_transmit = now + 5.0;
-  else
-    c->next_transmit = now + 1.0;
-
-  if (now > c->lease_expires)
-    {
-      /* Remove the default route */
-      if (c->router_address.as_u32)
-	{
-	  fib_prefix_t all_0s = {
-	    .fp_len = 0,
-	    .fp_addr.ip4.as_u32 = 0x0,
-	    .fp_proto = FIB_PROTOCOL_IP4,
-	  };
-	  ip46_address_t nh = {
-	    .ip4 = c->router_address,
-	  };
-
-	  fib_table_entry_path_remove (fib_table_get_index_for_sw_if_index
-				       (FIB_PROTOCOL_IP4, c->sw_if_index),
-				       &all_0s, FIB_SOURCE_DHCP,
-				       DPO_PROTO_IP4, &nh, c->sw_if_index, ~0,
-				       1, FIB_ROUTE_PATH_FLAG_NONE);
-	}
-      /* Remove the interface address */
-      dhcp_client_release_address (dcm, c);
-      c->state = DHCP_DISCOVER;
-      c->next_transmit = now;
-      c->retry_count = 0;
-      /* Wipe out any memory of the address we had... */
-      c->leased_address.as_u32 = 0;
-      c->subnet_mask_width = 0;
-      c->router_address.as_u32 = 0;
-      c->lease_renewal_interval = 0;
-      c->dhcp_server.as_u32 = 0;
-      return 1;
-    }
-  return 0;
-}
-
-static f64
-dhcp_client_sm (f64 now, f64 timeout, uword pool_index)
-{
-  dhcp_client_main_t *dcm = &dhcp_client_main;
-  dhcp_client_t *c;
-
-  /* deleted, pooched, yadda yadda yadda */
-  if (pool_is_free_index (dcm->clients, pool_index))
-    return timeout;
-
-  c = pool_elt_at_index (dcm->clients, pool_index);
-
-  /* Time for us to do something with this client? */
-  if (now < c->next_transmit)
-    return timeout;
-
-again:
-  switch (c->state)
-    {
-    case DHCP_DISCOVER:	/* send a discover */
-      if (dhcp_discover_state (dcm, c, now))
-	goto again;
-      break;
-
-    case DHCP_REQUEST:		/* send a request */
-      if (dhcp_request_state (dcm, c, now))
-	goto again;
-      break;
-
-    case DHCP_BOUND:		/* bound, renew needed? */
-      if (dhcp_bound_state (dcm, c, now))
-	goto again;
-      break;
-
-    default:
-      clib_warning ("dhcp client %d bogus state %d",
-		    c - dcm->clients, c->state);
-      break;
-    }
-
-  if (c->next_transmit < now + timeout)
-    return c->next_transmit - now;
-
-  return timeout;
-}
-
-static uword
-dhcp_client_process (vlib_main_t * vm,
-		     vlib_node_runtime_t * rt, vlib_frame_t * f)
-{
-  f64 timeout = 100.0;
-  f64 now;
-  uword event_type;
-  uword *event_data = 0;
-  dhcp_client_main_t *dcm = &dhcp_client_main;
-  dhcp_client_t *c;
-  int i;
-
-  while (1)
-    {
-      vlib_process_wait_for_event_or_clock (vm, timeout);
-
-      event_type = vlib_process_get_events (vm, &event_data);
-
-      now = vlib_time_now (vm);
-
-      switch (event_type)
-	{
-	case EVENT_DHCP_CLIENT_WAKEUP:
-	  for (i = 0; i < vec_len (event_data); i++)
-	    timeout = dhcp_client_sm (now, timeout, event_data[i]);
-	  break;
-
-	case ~0:
-          /* *INDENT-OFF* */
-	  pool_foreach (c, dcm->clients,
-          ({
-            timeout = dhcp_client_sm (now, timeout,
-                                      (uword) (c - dcm->clients));
-          }));
-          /* *INDENT-ON* */
-	  if (pool_elts (dcm->clients) == 0)
-	    timeout = 100.0;
-	  break;
-	}
-
-      vec_reset_length (event_data);
-    }
-
-  /* NOTREACHED */
-  return 0;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (dhcp_client_process_node,static) = {
-    .function = dhcp_client_process,
-    .type = VLIB_NODE_TYPE_PROCESS,
-    .name = "dhcp-client-process",
-    .process_log2_n_stack_bytes = 16,
-    .n_errors = ARRAY_LEN(dhcp_client_process_stat_strings),
-    .error_strings = dhcp_client_process_stat_strings,
-};
-/* *INDENT-ON* */
-
-static u8 *
-format_dhcp_client_state (u8 * s, va_list * va)
-{
-  dhcp_client_state_t state = va_arg (*va, dhcp_client_state_t);
-  char *str = "BOGUS!";
-
-  switch (state)
-    {
-#define _(a)                                    \
-    case a:                                     \
-      str = #a;                                 \
-        break;
-      foreach_dhcp_client_state;
-#undef _
-    default:
-      break;
-    }
-
-  s = format (s, "%s", str);
-  return s;
-}
-
-static u8 *
-format_dhcp_client (u8 * s, va_list * va)
-{
-  dhcp_client_main_t *dcm = va_arg (*va, dhcp_client_main_t *);
-  dhcp_client_t *c = va_arg (*va, dhcp_client_t *);
-  int verbose = va_arg (*va, int);
-  ip4_address_t *addr;
-
-  s = format (s, "[%d] %U state %U ", c - dcm->clients,
-	      format_vnet_sw_if_index_name, dcm->vnet_main, c->sw_if_index,
-	      format_dhcp_client_state, c->state);
-
-  if (0 != c->dscp)
-    s = format (s, "dscp %d ", c->dscp);
-
-  if (c->leased_address.as_u32)
-    {
-      s = format (s, "addr %U/%d gw %U",
-		  format_ip4_address, &c->leased_address,
-		  c->subnet_mask_width, format_ip4_address,
-		  &c->router_address);
-
-      vec_foreach (addr, c->domain_server_address)
-	s = format (s, " dns %U", format_ip4_address, addr);
-    }
-  else
-    {
-      s = format (s, "no address\n");
-    }
-
-  if (verbose)
-    {
-      s =
-	format (s,
-		"\n lease: lifetime:%d renewal-interval:%d expires:%.2f (now:%.2f)",
-		c->lease_lifetime, c->lease_renewal_interval,
-		c->lease_expires, vlib_time_now (dcm->vlib_main));
-      s =
-	format (s, "\n retry-count:%d, next-xmt:%.2f", c->retry_count,
-		c->next_transmit);
-      s =
-	format (s, "\n adjacencies:[unicast:%d broadcast:%d]", c->ai_ucast,
-		c->ai_bcast);
-    }
-  return s;
-}
-
-static clib_error_t *
-show_dhcp_client_command_fn (vlib_main_t * vm,
-			     unformat_input_t * input,
-			     vlib_cli_command_t * cmd)
-{
-  dhcp_client_main_t *dcm = &dhcp_client_main;
-  dhcp_client_t *c;
-  int verbose = 0;
-  u32 sw_if_index = ~0;
-  uword *p;
-
-  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
-    {
-      if (unformat (input, "intfc %U",
-		    unformat_vnet_sw_interface, dcm->vnet_main, &sw_if_index))
-	;
-      else if (unformat (input, "verbose"))
-	verbose = 1;
-      else
-	break;
-    }
-
-  if (sw_if_index != ~0)
-    {
-      p = hash_get (dcm->client_by_sw_if_index, sw_if_index);
-      if (p == 0)
-	return clib_error_return (0, "dhcp client not configured");
-      c = pool_elt_at_index (dcm->clients, p[0]);
-      vlib_cli_output (vm, "%U", format_dhcp_client, dcm, c, verbose);
-      return 0;
-    }
-
-  /* *INDENT-OFF* */
-  pool_foreach (c, dcm->clients,
-  ({
-    vlib_cli_output (vm, "%U",
-                     format_dhcp_client, dcm,
-                     c, verbose);
-  }));
-  /* *INDENT-ON* */
-
-  return 0;
-}
-
-/* *INDENT-OFF* */
-VLIB_CLI_COMMAND (show_dhcp_client_command, static) = {
-  .path = "show dhcp client",
-  .short_help = "show dhcp client [intfc <intfc>][verbose]",
-  .function = show_dhcp_client_command_fn,
-};
-/* *INDENT-ON* */
-
-
-int
-dhcp_client_add_del (dhcp_client_add_del_args_t * a)
-{
-  dhcp_client_main_t *dcm = &dhcp_client_main;
-  vlib_main_t *vm = dcm->vlib_main;
-  dhcp_client_t *c;
-  uword *p;
-  fib_prefix_t all_0s = {
-    .fp_len = 0,
-    .fp_addr.ip4.as_u32 = 0x0,
-    .fp_proto = FIB_PROTOCOL_IP4,
-  };
-
-  p = hash_get (dcm->client_by_sw_if_index, a->sw_if_index);
-
-  if ((p && a->is_add) || (!p && a->is_add == 0))
-    return VNET_API_ERROR_INVALID_VALUE;
-
-  if (a->is_add)
-    {
-      dhcp_maybe_register_udp_ports (DHCP_PORT_REG_CLIENT);
-      pool_get (dcm->clients, c);
-      clib_memset (c, 0, sizeof (*c));
-      c->state = DHCP_DISCOVER;
-      c->sw_if_index = a->sw_if_index;
-      c->client_index = a->client_index;
-      c->pid = a->pid;
-      c->event_callback = a->event_callback;
-      c->option_55_data = a->option_55_data;
-      c->hostname = a->hostname;
-      c->client_identifier = a->client_identifier;
-      c->set_broadcast_flag = a->set_broadcast_flag;
-      c->dscp = a->dscp;
-      c->ai_ucast = ADJ_INDEX_INVALID;
-      c->ai_bcast = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
-					 VNET_LINK_IP4,
-					 &ADJ_BCAST_ADDR, c->sw_if_index);
-
-      do
-	{
-	  c->transaction_id = random_u32 (&dcm->seed);
-	}
-      while (c->transaction_id == 0);
-
-      hash_set (dcm->client_by_sw_if_index, a->sw_if_index, c - dcm->clients);
-
-      /*
-       * In order to accept any OFFER, whether broadcasted or unicasted, we
-       * need to configure the dhcp-client-detect feature as an input feature
-       * so the DHCP OFFER is sent to the ip4-local node. Without this a
-       * broadcasted OFFER hits the 255.255.255.255/32 address and a unicast
-       * hits 0.0.0.0/0 both of which default to drop and the latter may forward
-       * of box - not what we want. Nor to we want to change these route for
-       * all interfaces in this table
-       */
-      vnet_feature_enable_disable ("ip4-unicast",
-				   "ip4-dhcp-client-detect",
-				   c->sw_if_index, 1 /* enable */ , 0, 0);
-      c->client_detect_feature_enabled = 1;
-
-      vlib_process_signal_event (vm, dhcp_client_process_node.index,
-				 EVENT_DHCP_CLIENT_WAKEUP, c - dcm->clients);
-    }
-  else
-    {
-      c = pool_elt_at_index (dcm->clients, p[0]);
-
-      if (c->router_address.as_u32)
-	{
-	  ip46_address_t nh = {
-	    .ip4 = c->router_address,
-	  };
-
-	  fib_table_entry_path_remove (fib_table_get_index_for_sw_if_index
-				       (FIB_PROTOCOL_IP4, c->sw_if_index),
-				       &all_0s, FIB_SOURCE_DHCP,
-				       DPO_PROTO_IP4, &nh, c->sw_if_index, ~0,
-				       1, FIB_ROUTE_PATH_FLAG_NONE);
-	}
-      dhcp_client_release_address (dcm, c);
-
-      adj_unlock (c->ai_ucast);
-      adj_unlock (c->ai_bcast);
-
-      vec_free (c->domain_server_address);
-      vec_free (c->option_55_data);
-      vec_free (c->hostname);
-      vec_free (c->client_identifier);
-      hash_unset (dcm->client_by_sw_if_index, c->sw_if_index);
-      pool_put (dcm->clients, c);
-    }
-  return 0;
-}
-
-int
-dhcp_client_config (u32 is_add,
-		    u32 client_index,
-		    vlib_main_t * vm,
-		    u32 sw_if_index,
-		    u8 * hostname,
-		    u8 * client_id,
-		    dhcp_event_cb_t event_callback,
-		    u8 set_broadcast_flag, ip_dscp_t dscp, u32 pid)
-{
-  dhcp_client_add_del_args_t _a, *a = &_a;
-  int rv;
-
-  clib_memset (a, 0, sizeof (*a));
-  a->is_add = is_add;
-  a->sw_if_index = sw_if_index;
-  a->client_index = client_index;
-  a->pid = pid;
-  a->event_callback = event_callback;
-  a->set_broadcast_flag = set_broadcast_flag;
-  a->dscp = dscp;
-  vec_validate (a->hostname, strlen ((char *) hostname) - 1);
-  strncpy ((char *) a->hostname, (char *) hostname, vec_len (a->hostname));
-  vec_validate (a->client_identifier, strlen ((char *) client_id) - 1);
-  strncpy ((char *) a->client_identifier, (char *) client_id,
-	   vec_len (a->client_identifier));
-
-  /*
-   * Option 55 request list. These data precisely match
-   * the Ubuntu dhcp client. YMMV.
-   */
-
-  /* Subnet Mask */
-  vec_add1 (a->option_55_data, 1);
-  /* Broadcast address */
-  vec_add1 (a->option_55_data, 28);
-  /* time offset */
-  vec_add1 (a->option_55_data, 2);
-  /* Router */
-  vec_add1 (a->option_55_data, 3);
-  /* Domain Name */
-  vec_add1 (a->option_55_data, 15);
-  /* DNS */
-  vec_add1 (a->option_55_data, 6);
-  /* Domain search */
-  vec_add1 (a->option_55_data, 119);
-  /* Host name */
-  vec_add1 (a->option_55_data, 12);
-  /* NetBIOS name server */
-  vec_add1 (a->option_55_data, 44);
-  /* NetBIOS Scope */
-  vec_add1 (a->option_55_data, 47);
-  /* MTU */
-  vec_add1 (a->option_55_data, 26);
-  /* Classless static route */
-  vec_add1 (a->option_55_data, 121);
-  /* NTP servers */
-  vec_add1 (a->option_55_data, 42);
-
-  rv = dhcp_client_add_del (a);
-
-  switch (rv)
-    {
-    case 0:
-      break;
-
-    case VNET_API_ERROR_INVALID_VALUE:
-
-      vec_free (a->hostname);
-      vec_free (a->client_identifier);
-      vec_free (a->option_55_data);
-
-      if (is_add)
-	clib_warning ("dhcp client already enabled on intf_idx %d",
-		      sw_if_index);
-      else
-	clib_warning ("dhcp client not enabled on on intf_idx %d",
-		      sw_if_index);
-      break;
-
-    default:
-      clib_warning ("dhcp_client_add_del returned %d", rv);
-    }
-
-  return rv;
-}
-
-void
-dhcp_client_walk (dhcp_client_walk_cb_t cb, void *ctx)
-{
-  dhcp_client_main_t *dcm = &dhcp_client_main;
-  dhcp_client_t *c;
-
-  /* *INDENT-OFF* */
-  pool_foreach (c, dcm->clients,
-  ({
-    if (!cb(c, ctx))
-      break;
-  }));
-  /* *INDENT-ON* */
-
-}
-
-static clib_error_t *
-dhcp_client_set_command_fn (vlib_main_t * vm,
-			    unformat_input_t * input,
-			    vlib_cli_command_t * cmd)
-{
-
-  dhcp_client_main_t *dcm = &dhcp_client_main;
-  u32 sw_if_index;
-  u8 *hostname = 0;
-  u8 sw_if_index_set = 0;
-  u8 set_broadcast_flag = 1;
-  int is_add = 1;
-  dhcp_client_add_del_args_t _a, *a = &_a;
-  int rv;
-
-  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
-    {
-      if (unformat (input, "intfc %U",
-		    unformat_vnet_sw_interface, dcm->vnet_main, &sw_if_index))
-	sw_if_index_set = 1;
-      else if (unformat (input, "hostname %v", &hostname))
-	;
-      else if (unformat (input, "del"))
-	is_add = 0;
-      else if (unformat (input, "broadcast", &set_broadcast_flag))
-	is_add = 0;
-      else
-	break;
-    }
-
-  if (sw_if_index_set == 0)
-    return clib_error_return (0, "interface not specified");
-
-  clib_memset (a, 0, sizeof (*a));
-  a->is_add = is_add;
-  a->sw_if_index = sw_if_index;
-  a->hostname = hostname;
-  a->client_identifier = format (0, "vpe 1.0%c", 0);
-  a->set_broadcast_flag = set_broadcast_flag;
-
-  /*
-   * Option 55 request list. These data precisely match
-   * the Ubuntu dhcp client. YMMV.
-   */
-
-  /* Subnet Mask */
-  vec_add1 (a->option_55_data, 1);
-  /* Broadcast address */
-  vec_add1 (a->option_55_data, 28);
-  /* time offset */
-  vec_add1 (a->option_55_data, 2);
-  /* Router */
-  vec_add1 (a->option_55_data, 3);
-  /* Domain Name */
-  vec_add1 (a->option_55_data, 15);
-  /* DNS */
-  vec_add1 (a->option_55_data, 6);
-  /* Domain search */
-  vec_add1 (a->option_55_data, 119);
-  /* Host name */
-  vec_add1 (a->option_55_data, 12);
-  /* NetBIOS name server */
-  vec_add1 (a->option_55_data, 44);
-  /* NetBIOS Scope */
-  vec_add1 (a->option_55_data, 47);
-  /* MTU */
-  vec_add1 (a->option_55_data, 26);
-  /* Classless static route */
-  vec_add1 (a->option_55_data, 121);
-  /* NTP servers */
-  vec_add1 (a->option_55_data, 42);
-
-  rv = dhcp_client_add_del (a);
-
-  switch (rv)
-    {
-    case 0:
-      break;
-
-    case VNET_API_ERROR_INVALID_VALUE:
-
-      vec_free (a->hostname);
-      vec_free (a->client_identifier);
-      vec_free (a->option_55_data);
-      if (is_add)
-	return clib_error_return (0, "dhcp client already enabled on %U",
-				  format_vnet_sw_if_index_name,
-				  dcm->vnet_main, sw_if_index);
-      else
-	return clib_error_return (0, "dhcp client not enabled on %U",
-				  format_vnet_sw_if_index_name,
-				  dcm->vnet_main, sw_if_index);
-      break;
-
-    default:
-      vlib_cli_output (vm, "dhcp_client_add_del returned %d", rv);
-    }
-
-  return 0;
-}
-
-/* *INDENT-OFF* */
-VLIB_CLI_COMMAND (dhcp_client_set_command, static) = {
-  .path = "set dhcp client",
-  .short_help = "set dhcp client [del] intfc <interface> [hostname <name>]",
-  .function = dhcp_client_set_command_fn,
-};
-/* *INDENT-ON* */
-
-static clib_error_t *
-dhcp_client_init (vlib_main_t * vm)
-{
-  dhcp_client_main_t *dcm = &dhcp_client_main;
-
-  dcm->vlib_main = vm;
-  dcm->vnet_main = vnet_get_main ();
-  dcm->seed = (u32) clib_cpu_time_now ();
-  return 0;
-}
-
-VLIB_INIT_FUNCTION (dhcp_client_init);
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */