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# 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=""
# 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=$8
fi
# Add route to VRF routing table
local VTYSH_VRF_NAME=$(/usr/sbin/ip link show dev $VTYSH_DEV | sed -nre '1s/.* master ([^ ]*) .*/\1/p')
if /usr/sbin/ip -d link show dev $VTYSH_DEV | grep -q "vrf_slave"; then
VTYSH_VRF="vrf $VTYSH_VRF_NAME"
fi
VTYSH_CMD="ip route $VTYSH_NETADDR $VTYSH_GATEWAY $VTYSH_DEV tag $VTYSH_TAG $VTYSH_DISTANCE $VTYSH_VRF"
# 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
}
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