#!/bin/bash

MAC2EUI64=/usr/bin/mac2eui64

source /etc/default/snf-network

host=$(hostname)
domain=$(hostname -d)

FIRST=0
LAST=$((GANETI_INSTANCE_NIC_COUNT - 1))
for idx in $(seq $FIRST $LAST); do
  ip=GANETI_INSTANCE_NIC${idx}_IP
  mac=GANETI_INSTANCE_NIC${idx}_MAC
  mode=GANETI_INSTANCE_NIC${idx}_MODE
  link=GANETI_INSTANCE_NIC${idx}_LINK
  network=GANETI_INSTANCE_NIC${idx}_NETWORK_SUBNET
  subnet6=GANETI_INSTANCE_NIC${idx}_NETWORK_SUBNET6
  tags=GANETI_INSTANCE_NIC${idx}_NETWORK_TAGS
  eval IP=\$$ip
  eval MAC=\$$mac
  eval MODE=\$$mode
  eval LINK=\$$link
  eval NETWORK=\$$network
  eval SUBNET6=\$$subnet6
  eval TAGS=\$$tags

  for tag in $TAGS; do
    case $tag in
    $IP_LESS_ROUTED_TAG)
      uplink=$(ip route list table $LINK | grep "default via" | awk '{print $5}')
      uplink6=$(ip -6 route list table $LINK | grep "default via" | awk '{print $5}')
      eui64=$($MAC2EUI64 $MAC $SUBNET6 2>/dev/null)
      if [ "$GANETI_INSTANCE_PRIMARY" = "$host.$domain" ]; then
        # This runs on the source node
        hooks-log $0 "ip -6 neigh del proxy $eui64 dev $uplink6"
        ip -6 neigh del proxy $eui64 dev $uplink6 >/dev/null 2>&1
      else
        # This runs on the target node
        # Send GARP from host to upstream router to speed up mac change for the VMs IP
        hooks-log $0 "arping  -c3 -I $uplink -U $IP"
        echo 1 > /proc/sys/net/ipv4/ip_nonlocal_bind
        arping  -c3 -I $uplink -U $IP
        echo 0 > /proc/sys/net/ipv4/ip_nonlocal_bind
        # Send Unsolicited Neighbor Advertisement to speed up nd change for the VMs IP
        hooks-log $0 "ndsend $eui64 $uplink6"
        ndsend $eui64 $uplink6
      fi
    ;;
    esac
  done
done

exit 0