# redefine ip command to use FRR when it is available # get status of FRR function frr_alive () { /usr/lib/frr/watchfrr.sh all_status if [ "$?" -eq "0" ] ; then logmsg info "FRR status: running" return 0 else logmsg info "FRR status: not running" return 1 fi } # convert ip route command to vtysh function iptovtysh () { # prepare variables for vtysh command local VTYSH_DISTANCE="210" local VTYSH_TAG="210" local VTYSH_NETADDR="" local VTYSH_GATEWAY="" local VTYSH_DEV="" local VTYSH_VRF_NAME=$(ip -d link show dev $interface | grep $interface | awk '{print $9}') # 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 # get gateway address if [ "$5" == "via" ] ; then VTYSH_GATEWAY=$6 fi # get device name if [ "$5" == "dev" ]; then VTYSH_DEV=$6 elif [ "$7" == "dev" ]; then VTYSH_DEV=$8 fi # check if vrf is present if [ $(ip -d link show dev $interface | grep vrf | wc -l) -eq 0 ]; then VTYSH_CMD="ip route $VTYSH_NETADDR $VTYSH_GATEWAY $VTYSH_DEV tag $VTYSH_TAG $VTYSH_DISTANCE" elif [ $(ip -d link show dev $interface | grep vrf | wc -l) -eq 1 ]; then VTYSH_CMD="ip route $VTYSH_NETADDR $VTYSH_GATEWAY $VTYSH_DEV tag $VTYSH_TAG $VTYSH_DISTANCE vrf $VTYSH_VRF_NAME" fi # delete route if the command is "del" if [ "$3" == "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: $@" if /usr/sbin/ip route show $@ | grep -qx "$1 " ; then logmsg info "Deleting IP route: \"/usr/sbin/ip route del $@\"" /usr/sbin/ip route del $@ fi } # replace ip command with this wrapper function ip () { # pass comand to system `ip` if this is not related to routes change if [ "$2" != "route" ] ; then logmsg info "Passing command to /usr/sbin/ip: \"$@\"" /usr/sbin/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: \"/usr/sbin/ip $@\"" /usr/sbin/ip $@ fi fi }