#
#                                +--------+
#                                |        |
#                                |   MR   |
#                                |        |
#                                +--------+
#                                     |6.0.3.100
#6:0:1::2                             |6:0:3::100
#6.0.1.2     vpp1 +--------+          |         +--------+
#       +---------+        |intervpp1 |intervpp2|        |vpp2
#                 |  VPP1  +----------+---------+  VPP2  +---------+
#                 |        |                    |        |      6.0.2.2
#                 +--------+                    +--------+      6:0:2::2
#

function set_arp
{
  mac=`ip netns exec vppns1 ip a show dev veth_vpp1  | grep "link/ether" | awk '{print $2}'`
  echo "set ip arp host-vpp1 6.0.1.2 $mac" | nc 0 5002
  echo "set ip6 neighbor host-vpp1 6:0:1::2 $mac" | nc 0 5002

  mac=`ip netns exec vppns2 ip a show dev veth_vpp2  | grep "link/ether" | awk '{print $2}'`
  echo "set ip arp host-vpp2 6.0.2.2 $mac" | nc 0 5003
  echo "set ip6 neighbor host-vpp2 6:0:2::2 $mac" | nc 0 5003

  mac=`echo "sh hard host-intervpp1" | nc 0 5002 | grep 'Ethernet address' | awk '{print $3}'`
  echo "set ip arp host-intervpp2 6.0.3.1 $mac" | nc 0 5003
  echo "set ip6 neighbor host-intervpp2 6:0:3::1 $mac" | nc 0 5003

  mac=`echo "sh hard host-intervpp2" | nc 0 5003 | grep 'Ethernet address' | awk '{print $3}'`
  echo "set ip arp host-intervpp1 6.0.3.2 $mac" | nc 0 5002
  echo "set ip6 neighbor host-intervpp1 6:0:3::2 $mac" | nc 0 5002
}

function 2_node_topo_clean
{
  echo "Clearing all VPP instances.."
  pkill vpp --signal 9
  rm /dev/shm/*

  echo "Cleaning topology.."
  ip netns exec intervppns ifconfig vppbr down
  ip netns exec intervppns brctl delbr vppbr
  ip link del dev veth_vpp1 &> /dev/null
  ip link del dev veth_vpp2 &> /dev/null
  ip link del dev veth_intervpp1 &> /dev/null
  ip link del dev veth_intervpp2 &> /dev/null
  ip link del dev veth_odl &> /dev/null
  ip netns del vppns1 &> /dev/null
  ip netns del vppns2 &> /dev/null
  ip netns del intervppns &> /dev/null

  if [ "$1" != "no_odl" ] ; then
    odl_clear_all
  fi
}

function 2_node_topo_setup
{

  # create vpp to clients and inter-vpp namespaces
  ip netns add vppns1
  ip netns add vppns2
  ip netns add intervppns

  # create vpp and odl interfaces and set them in intervppns
  ip link add veth_intervpp1 type veth peer name intervpp1
  ip link add veth_intervpp2 type veth peer name intervpp2
  ip link add veth_odl type veth peer name odl
  ip link set dev intervpp1 up
  ip link set dev intervpp2 up
  ip link set dev odl up
  ip link set dev veth_intervpp1 up netns intervppns
  ip link set dev veth_intervpp2 up netns intervppns
  ip link set dev veth_odl up netns intervppns

  # create bridge in intervppns and add vpp and odl interfaces
  ip netns exec intervppns brctl addbr vppbr
  ip netns exec intervppns brctl addif vppbr veth_intervpp1
  ip netns exec intervppns brctl addif vppbr veth_intervpp2
  ip netns exec intervppns brctl addif vppbr veth_odl
  ip netns exec intervppns ifconfig vppbr up

  # create and configure 1st veth client to vpp pair
  ip link add veth_vpp1 type veth peer name vpp1
  ip link set dev vpp1 up
  ip link set dev veth_vpp1 up netns vppns1

  # create and configure 2nd veth client to vpp pair
  ip link add veth_vpp2 type veth peer name vpp2
  ip link set dev vpp2 up
  ip link set dev veth_vpp2 up netns vppns2

  ip netns exec vppns1 \
  bash -c "
    ip link set dev lo up
    ip addr add 6.0.1.2/24 dev veth_vpp1
    ip route add 6.0.2.0/24 via 6.0.1.1
    ip addr add 6:0:1::2/64 dev veth_vpp1
    ip route add 6:0:2::0/64 via 6:0:1::1
  "

  ip netns exec vppns2 \
  bash -c "
    ip link set dev lo up
    ip addr add 6.0.2.2/24 dev veth_vpp2
    ip route add 6.0.1.0/24 via 6.0.2.1
    ip addr add 6:0:2::2/64 dev veth_vpp2
    ip route add 6:0:1::0/64 via 6:0:2::1
  "

  # set odl iface ip and disable checksum offloading
  ip addr add 6.0.3.100/24 dev odl
  ip addr add 6:0:3::100/64 dev odl
  ethtool --offload  odl rx off tx off

  # generate config files
  ./scripts/generate_config.py ${VPP_LITE_CONF} ${CFG_METHOD}

  start_vpp 5002 vpp1
  start_vpp 5003 vpp2

  sleep 2
  echo "* Selected configuration method: $CFG_METHOD"
  if [ "$CFG_METHOD" == "cli" ] ; then
    echo "exec ${VPP_LITE_CONF}/vpp1.cli" | nc 0 5002
    echo "exec ${VPP_LITE_CONF}/vpp2.cli" | nc 0 5003
  elif [ "$CFG_METHOD" == "vat" ] ; then
    ${VPP_API_TEST} chroot prefix vpp1 script in ${VPP_LITE_CONF}/vpp1.vat
    ${VPP_API_TEST} chroot prefix vpp2 script in ${VPP_LITE_CONF}/vpp2.vat
  else
    echo "=== WARNING:"
    echo "=== Invalid configuration method selected!"
    echo "=== To resolve this set env variable CFG_METHOD to vat or cli."
    echo "==="
  fi

  if [ "$1" != "no_odl" ] ; then
    post_curl "add-mapping" ${ODL_CONFIG_FILE1}
    post_curl "add-mapping" ${ODL_CONFIG_FILE2}
  fi

  set_arp
}