# redefine ip command to use FRR when it is available # default route distance IF_METRIC=${IF_METRIC:-210} # Check if interface is inside a VRF VRF_OPTION=$(ip -j -d link show ${interface} | awk '{if(match($0, /.*"master":"(\w+)".*"info_slave_kind":"vrf"/, IFACE_DETAILS)) printf("vrf %s", IFACE_DETAILS[1])}') # get status of FRR function frr_alive () { /usr/lib/frr/watchfrr.sh all_status if [ "$?" -eq "0" ] ; then logmsg info "FRR status: running" return 0 else logmsg info "FRR status: not running" return 1 fi } # convert ip route command to vtysh function iptovtysh () { # prepare variables for vtysh command local VTYSH_ACTION=$3 local VTYSH_NETADDR="" local VTYSH_GATEWAY="" local VTYSH_DEV="" local VTYSH_TAG="210" local VTYSH_DISTANCE="" # convert default route to 0.0.0.0/0 if [ "$4" == "default" ] ; then VTYSH_NETADDR="0.0.0.0/0" else VTYSH_NETADDR=$4 fi # add /32 to ip addresses without netmasks if [[ ! $VTYSH_NETADDR =~ ^.*/[[:digit:]]+$ ]] ; then VTYSH_NETADDR="$VTYSH_NETADDR/32" fi shift 4 # get gateway address if [ "$1" == "via" ] ; then VTYSH_GATEWAY=$2 shift 2 fi # get device name if [ "$1" == "dev" ]; then VTYSH_DEV=$2 shift 2 fi # get distance if [ "$1" == "metric" ]; then VTYSH_DISTANCE=$2 shift 2 fi VTYSH_CMD="ip route $VTYSH_NETADDR $VTYSH_GATEWAY $VTYSH_DEV tag $VTYSH_TAG $VTYSH_DISTANCE $VRF_OPTION" # delete route if the command is "del" if [ "$VTYSH_ACTION" == "del" ] ; then VTYSH_CMD="no $VTYSH_CMD" fi logmsg info "Converted vtysh command: \"$VTYSH_CMD\"" } # delete the same route from kernel before adding new one function delroute () { logmsg info "Checking if the route presented in kernel: $@ $VRF_OPTION" if ip route show $@ $VRF_OPTION | grep -qx "$1 " ; then logmsg info "Deleting IP route: \"ip route del $@ $VRF_OPTION\"" ip route del $@ $VRF_OPTION fi } # replace ip command with this wrapper function ip () { # pass comand to system `ip` if this is not related to routes change if [ "$2" != "route" ] ; then logmsg info "Passing command to iproute2: \"$@\"" ip $@ else # if we want to work with routes, try to use FRR first if frr_alive ; then delroute ${@:4} iptovtysh $@ logmsg info "Sending command to vtysh" vtysh -c "conf t" -c "$VTYSH_CMD" else # add ip route to kernel logmsg info "Modifying routes in kernel: \"ip $@\"" ip $@ $VRF_OPTION fi fi }