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%define _mu_build_dir    %{_mu_build_root_dir}
%define _vpp_install_dir %{_install_dir}
%define _vpp_build_dir   build-tool-native
%define _unitdir         /lib/systemd/system
%define _topdir          %(pwd)
%define _builddir        %{_topdir}
%define _version         %(../scripts/version rpm-version)
%define _release         %(../scripts/version rpm-release)

# Failsafe backport of Python2-macros for RHEL <= 6
%{!?python_sitelib: %global python_sitelib      %(%{__python} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")}
%{!?python_sitearch:    %global python_sitearch     %(%{__python} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib(1))")}
%{!?python_version: %global python_version      %(%{__python} -c "import sys; sys.stdout.write(sys.version[:3])")}
%{!?__python2:      %global __python2       %{__python}}
%{!?python2_sitelib:    %global python2_sitelib     %{python_sitelib}}
%{!?python2_sitearch:   %global python2_sitearch    %{python_sitearch}}
%{!?python2_version:    %global python2_version     %{python_version}}

%{!?python2_minor_version: %define python2_minor_version %(%{__python} -c "import sys ; print sys.version[2:3]")}

%{?systemd_requires}

Name: vpp
Summary: Vector Packet Processing
License: MIT
Version: %{_version}
Release: %{_release}
Requires: vpp-lib = %{_version}-%{_release}, net-tools, pciutils, python
BuildRequires: systemd, chrpath

Source: %{name}-%{_version}-%{_release}.tar.gz

%description
This package provides VPP executables: vpp, vpp_api_test, vpp_json_test
vpp - the vector packet engine
vpp_api_test - vector packet engine API test tool
vpp_json_test - vector packet engine JSON test tool

%package lib
Summary: VPP libraries
Group: System Environment/Libraries

%description lib
This package contains the VPP shared libraries, including:
vppinfra - foundation library supporting vectors, hashes, bitmaps, pools, and string formatting.
svm - vm library
vlib - vector processing library
vlib-api - binary API library
vnet -  network stack library

%package devel
Summary: VPP header files, static libraries
Group: Development/Libraries
Requires: vpp-lib

%description devel
This package contains the header files for VPP.
Install this package if you want to write a
program for compilation and linking with vpp lib.
vlib
vlibmemory
vnet - devices, classify, dhcp, ethernet flow, gre, ip, etc.
vpp-api
vppinfra

%package plugins
Summary: Vector Packet Processing--runtime plugins
Group: System Environment/Libraries
Requires: vpp = %{_version}-%{_release}
%description plugins
This package contains VPP plugins

%package api-lua
Summary: VPP api lua bindings
Group: Development/Libraries
Requires: vpp = %{_version}-%{_release}, vpp-lib = %{_version}-%{_release}

%description api-lua
This package contains the lua bindings for the vpp api

%package api-java
Summary: VPP api java bindings
Group: Development/Libraries
Requires: vpp = %{_version}-%{_release}, vpp-lib = %{_version}-%{_release}

%description api-java
This package contains the java bindings for the vpp api

%package api-python
Summary: VPP api python bindings
Group: Development/Libraries
Requires: vpp = %{_version}-%{_release}, vpp-lib = %{_version}-%{_release}, python-setuptools

%description api-python
This package contains the python bindings for the vpp api

%prep
%setup -q -n %{name}-%{_version}

%pre
# Add the vpp group
groupadd -f -r vpp

%install
#
# binaries
#
mkdir -p -m755 %{buildroot}%{_bindir}
mkdir -p -m755 %{buildroot}%{_unitdir}
install -p -m 755 %{_mu_build_dir}/%{_vpp_install_dir}/vpp/bin/* %{buildroot}%{_bindir}

# api
mkdir -p -m755 %{buildroot}/usr/share/vpp/api

#
# configs
#
mkdir -p -m755 %{buildroot}/etc/vpp
mkdir -p -m755 %{buildroot}/etc/sysctl.d
install -p -m 644 %{_mu_build_dir}/rpm/vpp.service %{buildroot}%{_unitdir}
install -p -m 644 %{_mu_build_dir}/../src/vpp/conf/startup.conf %{buildroot}/etc/vpp/startup.conf
install -p -m 644 %{_mu_build_dir}/../src/vpp/conf/80-vpp.conf %{buildroot}/etc/sysctl.d
#
# libraries
#
mkdir -p -m755 %{buildroot}%{_libdir}
mkdir -p -m755 %{buildroot}/etc/bash_completion.d
mkdir -p -m755 %{buildroot}/usr/share/vpp
for file in $(find %{_mu_build_dir}/%{_vpp_install_dir}/*/lib* -type f -name '*.so.*.*.*' -print )
do
	install -p -m 755 $file %{buildroot}%{_libdir}
done
for file in $(cd %{buildroot}%{_libdir} && find . -type f -print | sed -e 's/^\.\///')
do
	# make lib symlinks
	( cd %{buildroot}%{_libdir} && 
          ln -fs $file $(echo $file | sed -e 's/\(\.so\.[0-9]\+\).*/\1/') )
	( cd %{buildroot}%{_libdir} && 
          ln -fs $file $(echo $file | sed -e 's/\(\.so\)\.[0-9]\+.*/\1/') )
done
for file in $(find %{_mu_build_dir}/%{_vpp_install_dir}/vpp/share/vpp/api  -type f -name '*.api.json' -print )
do
	install -p -m 644 $file %{buildroot}/usr/share/vpp/api
done
install -p -m 644 %{_mu_build_dir}/../src/scripts/vppctl_completion %{buildroot}/etc/bash_completion.d
install -p -m 644 %{_mu_build_dir}/../src/scripts/vppctl-cmd-list %{buildroot}/usr/share/vpp

# Lua bindings
mkdir -p -m755 %{buildroot}/usr/share/doc/vpp/examples/lua/examples/cli
mkdir -p -m755 %{buildroot}/usr/share/doc/vpp/examples/lua/examples/lute
for file in $(cd %{_mu_build_dir}/%{_vpp_install_dir}/../../src/vpp-api/lua && git ls-files .)
do
	install -p -m 644 %{_mu_build_dir}/%{_vpp_install_dir}/../../src/vpp-api/lua/$file \
	   %{buildroot}/usr/share/doc/vpp/examples/lua/$file
done

# Java bindings
mkdir -p -m755 %{buildroot}/usr/share/java
for file in $(find %{_mu_build_dir}/%{_vpp_install_dir}/vpp/share/java -type f -name '*.jar' -print )
do
	install -p -m 644 $file %{buildroot}/usr/share/java
done

# Python bindings
mkdir -p -m755 %{buildroot}%{python2_sitelib}
install -p -m 666 %{_mu_build_dir}/%{_vpp_install_dir}/*/lib/python2.7/site-packages/vpp_papi-*.egg %{buildroot}%{python2_sitelib}

#
# devel
#
for dir in $(find %{_mu_build_dir}/%{_vpp_install_dir}/*/include/ -maxdepth 0 -type d -print | grep -v dpdk)
do
	for subdir in $(cd ${dir} && find . -type d -print)
	do
		mkdir -p -m755 %{buildroot}/usr/include/${subdir}
	done
	for file in $(cd ${dir} && find . -type f -print)
	do
		install -p -m 644 $dir/$file %{buildroot}%{_includedir}/$file
	done
done

mkdir -p -m755 %{buildroot}%{python2_sitelib}/jvppgen
install -p -m755 %{_mu_build_dir}/../src/vpp-api/java/jvpp/gen/jvpp_gen.py %{buildroot}/usr/bin
for i in $(ls %{_mu_build_dir}/../src/vpp-api/java/jvpp/gen/jvppgen/*.py); do
   install -p -m666 ${i} %{buildroot}%{python2_sitelib}/jvppgen
done;

# sample plugin
mkdir -p -m755 %{buildroot}/usr/share/doc/vpp/examples/sample-plugin/sample
for file in $(cd %{_mu_build_dir}/%{_vpp_install_dir}/../../src/examples/sample-plugin && git ls-files .)
do
	install -p -m 644 %{_mu_build_dir}/%{_vpp_install_dir}/../../src/examples/sample-plugin/$file \
	   %{buildroot}/usr/share/doc/vpp/examples/sample-plugin/$file
done


#
# vpp-plugins
# 
mkdir -p -m755 %{buildroot}/usr/lib/vpp_plugins
mkdir -p -m755 %{buildroot}/usr/lib/vpp_api_test_plugins
for file in $(cd %{_mu_build_dir}/%{_vpp_install_dir}/vpp/lib64/vpp_plugins && find -type f -print)
do
        install -p -m 644 %{_mu_build_dir}/%{_vpp_install_dir}/vpp/lib64/vpp_plugins/$file \
           %{buildroot}/usr/lib/vpp_plugins/$file
done

for file in $(cd %{_mu_build_dir}/%{_vpp_install_dir}/vpp/lib64/vpp_api_test_plugins && find -type f -print)
do
        install -p -m 644 %{_mu_build_dir}/%{_vpp_install_dir}/vpp/lib64/vpp_api_test_plugins/$file \
           %{buildroot}/usr/lib/vpp_api_test_plugins/$file
done

for file in $(find %{_mu_build_dir}/%{_vpp_install_dir}/plugins -type f -name '*.api.json' -print )
do
	install -p -m 644 $file %{buildroot}/usr/share/vpp/api
done

#
# remove RPATH from ELF binaries
#
%{_mu_build_dir}/scripts/remove-rpath %{buildroot}

%post
sysctl --system
%systemd_post vpp.service

%post api-python
easy_install -z %{python2_sitelib}/vpp_papi-*.egg

%preun
%systemd_preun vpp.service

%preun api-python
easy_install -mxNq vpp_papi

%postun
%systemd_postun

# Unbind user-mode PCI drivers
removed=
pci_dirs=`find /sys/bus/pci/drivers -type d -name igb_uio -o -name uio_pci_generic -o -name vfio-pci`
for d in $pci_dirs; do
    for f in ${d}/*; do
        [ -e "${f}/config" ] || continue
        echo ${f##*/} > ${d}/unbind
        basename `dirname ${f}` | xargs echo -n "Removing driver"; echo " for PCI ID" `basename ${f}`
        removed=y
    done
done
if [ -n "${removed}" ]; then
    echo "There are changes in PCI drivers, rescaning"
    echo 1 > /sys/bus/pci/rescan
else
    echo "There weren't PCI devices binded"
fi

%files
%defattr(-,bin,bin)
%{_unitdir}/vpp.service
/usr/bin/vpp*
/usr/bin/svm*
/usr/bin/elftool
%config /etc/sysctl.d/80-vpp.conf
%config /etc/vpp/startup.conf
/usr/share/vpp/api/*

%files lib
%defattr(-,bin,bin)
%exclude %{_libdir}/vpp_plugins
%exclude %{_libdir}/vpp_api_test_plugins
%{_libdir}/*
/usr/share/vpp/api/*
/etc/bash_completion.d/vppctl_completion
/usr/share/vpp/vppctl-cmd-list

%files api-lua
%defattr(644,root,root,644)
/usr/share/doc/vpp/examples/lua

%files api-java
%defattr(644,root,root)
/usr/share/java/*

%files api-python
%defattr(644,root,root)
%{python2_sitelib}/vpp_papi-*.egg

%files devel
%defattr(-,bin,bin)
/usr/bin/vppapigen
/usr/bin/jvpp_gen.py
%{_includedir}/*
%{python2_sitelib}/jvppgen/*
/usr/share/doc/vpp/examples/sample-plugin

%files plugins
%defattr(-,bin,bin)
/usr/lib/vpp_plugins/*
/usr/lib/vpp_api_test_plugins/*
/usr/share/vpp/api/*
='n1044' href='#n1044'>1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269
/*
 * 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 <dhcp/client.h>
#include <dhcp/dhcp_proxy.h>
#include <vnet/fib/fib_table.h>
#include <vnet/qos/qos_types.h>

vlib_log_class_t dhcp_logger;

dhcp_client_main_t dhcp_client_main;
static vlib_node_registration_t dhcp_client_process_node;

#define DHCP_DBG(...)                           \
    vlib_log_debug (dhcp_logger, __VA_ARGS__);

#define DHCP_INFO(...)                          \
    vlib_log_notice (dhcp_logger, __VA_ARGS__);

#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 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 installed %d", c - dcm->clients,
	      format_vnet_sw_if_index_name, dcm->vnet_main, c->sw_if_index,
	      format_dhcp_client_state, c->state, c->addresses_installed);

  if (0 != c->dscp)
    s = format (s, " dscp %d", c->dscp);

  if (c->installed.leased_address.as_u32)
    {
      s = format (s, " addr %U/%d gw %U server %U",
		  format_ip4_address, &c->installed.leased_address,
		  c->installed.subnet_mask_width,
		  format_ip4_address, &c->installed.router_address,
		  format_ip4_address, &c->installed.dhcp_server);

      vec_foreach (addr, c->domain_server_address)
	s = format (s, " dns %U", format_ip4_address, addr);
    }
  else
    {
      s = format (s, " no address");
    }

  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 void
dhcp_client_acquire_address (dhcp_client_main_t * dcm, dhcp_client_t * c)
{
  /*
   * Install any/all info gleaned from dhcp, right here
   */
  if (!c->addresses_installed)
    {
      ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index,
				     (void *) &c->learned.leased_address,
				     c->learned.subnet_mask_width,
				     0 /*is_del */ );
      if (c->learned.router_address.as_u32)
	{
	  fib_prefix_t all_0s = {
	    .fp_len = 0,
	    .fp_proto = FIB_PROTOCOL_IP4,
	  };
	  ip46_address_t nh = {
	    .ip4 = c->learned.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->learned.dhcp_server.as_u32)
	{
	  ip46_address_t dst = {
	    .ip4 = c->learned.dhcp_server,
	  };
	  c->ai_ucast = adj_nbr_add_or_lock (FIB_PROTOCOL_IP4,
					     VNET_LINK_IP4, &dst,
					     c->sw_if_index);
	}
    }
  clib_memcpy (&c->installed, &c->learned, sizeof (c->installed));
  c->addresses_installed = 1;
}

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.
   */
  if (c->addresses_installed)
    {
      ip4_add_del_interface_address (dcm->vlib_main, c->sw_if_index,
				     (void *) &c->installed.leased_address,
				     c->installed.subnet_mask_width,
				     1 /*is_del */ );

      /* Remove the default route */
      if (c->installed.router_address.as_u32)
	{
	  fib_prefix_t all_0s = {
	    .fp_len = 0,
	    .fp_proto = FIB_PROTOCOL_IP4,
	  };
	  ip46_address_t nh = {
	    .ip4 = c->installed.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);
	}
      adj_unlock (c->ai_ucast);
      c->ai_ucast = ADJ_INDEX_INVALID;
    }
  clib_memset (&c->installed, 0, sizeof (c->installed));
  c->addresses_installed = 0;
}

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 (u32 * cindex)
{
  dhcp_client_main_t *dcm = &dhcp_client_main;
  dhcp_client_t *c;

  c = pool_elt_at_index (dcm->clients, *cindex);

  /* 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;

  /* add the address to the interface if they've changed since the last time */
  if (0 != clib_memcmp (&c->installed, &c->learned, sizeof (c->learned)))
    {
      dhcp_client_release_address (dcm, c);
      dhcp_client_acquire_address (dcm, c);
    }

  /*
   * Call the user's event callback to report DHCP information
   */
  if (c->event_callback)
    c->event_callback (c->client_index, c);

  DHCP_INFO ("update: %U", format_dhcp_client, dcm, c);
}

static void
dhcp_client_reset (dhcp_client_main_t * dcm, dhcp_client_t * c)
{
  if (c->client_detect_feature_enabled == 1)
    {
      vnet_feature_enable_disable ("ip4-unicast",
				   "ip4-dhcp-client-detect",
				   c->sw_if_index, 0, 0, 0);
      c->client_detect_feature_enabled = 0;
    }

  dhcp_client_release_address (dcm, c);
  clib_memset (&c->learned, 0, sizeof (c->installed));
  c->state = DHCP_DISCOVER;
  c->next_transmit = vlib_time_now (dcm->vlib_main);
  c->retry_count = 0;
  c->lease_renewal_interval = 0;
  vec_free (c->domain_server_address);
}

/*
 * 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->learned.leased_address.as_u32 = dhcp->your_ip_address.as_u32;

  c->learned.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->learned.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->learned.subnet_mask_width = count_set_bits (subnet_mask);
	  }
	  break;
	case 3:		/* router address */
	  {
	    u32 router_address = o->data_as_u32[0];
	    c->learned.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...
	     Wipe out any memory of the address we had... */
	  dhcp_client_reset (dcm, c);
	  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) */
      {
	/* Send the index over to the main thread, where it can retrieve
	 * the original client */
	u32 cindex = c - dcm->clients;
	vl_api_force_rpc_call_main_thread (dhcp_client_addr_callback,
					   (u8 *) & cindex, sizeof (u32));
      }

      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;
    }

  /* return 1 so the call disposes of this packet */
  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;

  DHCP_INFO ("send: type:%U bcast:%d %U",
	     format_dhcp_packet_type, type,
	     is_broadcast, format_dhcp_client, dcm, c);

  /* 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 (ADJ_INDEX_INVALID == c->ai_ucast)
    is_broadcast = 1;

  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->learned.leased_address.as_u32;
      ip->dst_address.as_u32 = c->learned.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->learned.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->learned.dhcp_server.as_u32)
    {
      o->option = 54;
      o->length = 4;
      clib_memcpy (o->data, &c->learned.dhcp_server.as_u32, 4);
      o = (dhcp_option_t *) (((uword) o) + (o->length + 2));
    }

  /* send option 50, requested IP address */
  if (c->learned.leased_address.as_u32)
    {
      o->option = 50;
      o->length = 4;
      clib_memcpy (o->data, &c->learned.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.
   */
  DHCP_INFO ("enter discover: %U", format_dhcp_client, dcm, c);

  /*
   * 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
   */
  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.
   */
  DHCP_INFO ("enter request: %U", format_dhcp_client, dcm, c);

  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)
{
  /*
   * 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;
    }

  /*
   * 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.
   */
  if (now > c->lease_expires)
    {
      DHCP_INFO ("lease expired: %U", format_dhcp_client, dcm, c);

      /* reset all data for the client. do not send any more messages
       * since the objects to do so have been lost */
      dhcp_client_reset (dcm, c);
      return 1;
    }

  DHCP_INFO ("enter bound: %U", format_dhcp_client, dcm, c);
  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;

  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* */
          DHCP_INFO ("timeout");
	  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 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;

  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);

      vlib_process_signal_event (vm, dhcp_client_process_node.index,
				 EVENT_DHCP_CLIENT_WAKEUP, c - dcm->clients);

      DHCP_INFO ("create: %U", format_dhcp_client, dcm, c);
    }
  else
    {
      c = pool_elt_at_index (dcm->clients, p[0]);

      dhcp_client_reset (dcm, c);

      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 ();

  dhcp_logger = vlib_log_register_class ("dhcp", "client");

  return 0;
}

VLIB_INIT_FUNCTION (dhcp_client_init);

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