#!/bin/sh

configmode=`uci -q -c /etc/local/uci/ get hsmmmesh.settings.config`

if [ "$configmode" != "mesh" ] ; then exit 0; fi


# This section will generate rtnetlink errors when the rule doesn't exist.
# This will be most common in the case of ifup.
# On initial boot no route will be present, and on most interface restarts
# the route should already be gone from ifdown but some scripts do not call
# ifup/ifdown  to control the interface so we will want to make sure to
# run a clean before hand to avoid duplicate rules.

if [ "$ACTION" = "ifdown" ] || [ "$ACTION" = "ifup" ] ; then

  echo "Deleting specific routing rules that may exist."

  if [ "$INTERFACE" == "wifi" ] || [ "$INTERFACE" == "dtdlink" ] ; then
    ip rule del pref 20000 iif $DEVICE lookup 30
    ip rule del pref 20001 iif $DEVICE lookup 31
    ip rule del pref 20098 iif $DEVICE lookup main
    ip rule del pref 20099 iif $DEVICE unreachable 
  fi

  if [ "$INTERFACE" == "lan" ] ; then
    ip rule del pref 30000 iif $DEVICE lookup 30
    ip rule del pref 30098 iif $DEVICE lookup 31
    ip rule del pref 30099 iif $DEVICE lookup main
  fi

  if [ "$INTERFACE" == "loopback" ] ; then
    ip rule del pref 30200 lookup 30
    ip rule del pref 30201 lookup main
    ip rule del pref 30299 lookup 31
  fi

fi

if [ "$ACTION" = "ifup" ] ; then

is_olsrgw=`cat /etc/config.mesh/_setup|grep -i olsrd_gw|cut -d ' ' -f 3`


  # Set routes for wifi or device to device linking
  # unreachable rule is needed  to ensure packets do not traverse a rule later that considers routing to another network.

  echo "Setting routing rules."

  if [ "$INTERFACE" == "wifi" ] || [ "$INTERFACE" == "dtdlink" ]; then
    ip rule add pref 20000 iif $DEVICE lookup 30
    ip rule add pref 20001 iif $DEVICE lookup 31
    if [ $is_olsrgw -eq 1 ] ; then
      ip rule add pref 20098 iif $DEVICE lookup main
    fi
    ip rule add pref 20099 iif $DEVICE unreachable

  fi

  # Makes sure the lan interface is allowed to hit the mesh(30), meshgw(31), and local routes (main)  Local ethernet is trusted to use additonal rules.
  if [ "$INTERFACE" == "lan" ] ; then
    ip rule add pref 30000 iif $DEVICE lookup 30
    ip rule add pref 30098 iif $DEVICE lookup 31
    ip rule add pref 30099 iif $DEVICE lookup main
  fi

  # Handles setting up rules for local resolution of routes. MeshGW should be last for localhost otherwise ping test of olsrd will break
  if [ "$INTERFACE" == "loopback" ] ; then
    ip rule add pref 30200 lookup 30
    ip rule add pref 30201 lookup main
    ip rule add pref 30299 lookup 31
  fi

fi

# Ensure we send a good exit code
exit 0;