# Nicira NVP
# ----------

# This third-party addition can be used to configure connectivity between a DevStack instance
# and an NVP Gateway in dev/test environments. In order to use this correctly, the following
# env variables need to be set (e.g. in your localrc file):
#
# * enable_service nicira            --> to execute this third-party addition
# * PUBLIC_BRIDGE                    --> bridge used for external connectivity, typically br-ex
# * NVP_GATEWAY_NETWORK_INTERFACE    --> interface used to communicate with the NVP Gateway
# * NVP_GATEWAY_NETWORK_CIDR         --> CIDR to configure br-ex, e.g. 172.24.4.211/24

# Save trace setting
MY_XTRACE=$(set +o | grep xtrace)
set +o xtrace

# This is the interface that connects the Devstack instance
# to an network that allows it to talk to the gateway for
# testing purposes
NVP_GATEWAY_NETWORK_INTERFACE=${NVP_GATEWAY_NETWORK_INTERFACE:-eth2}
# Re-declare floating range as it's needed also in stop_nicira, which
# is invoked by unstack.sh
FLOATING_RANGE=${FLOATING_RANGE:-172.24.4.224/28}

function configure_nicira() {
    :
}

function init_nicira() {
    if ! is_set NVP_GATEWAY_NETWORK_CIDR; then
        NVP_GATEWAY_NETWORK_CIDR=$PUBLIC_NETWORK_GATEWAY/${FLOATING_RANGE#*/}
        echo "The IP address to set on br-ex was not specified. "
        echo "Defaulting to "$NVP_GATEWAY_NETWORK_CIDR
    fi
    # Make sure the interface is up, but not configured
    sudo ip link dev $NVP_GATEWAY_NETWORK_INTERFACE set up
    # Save and then flush the IP addresses on the interface
    addresses=$(ip addr show dev $NVP_GATEWAY_NETWORK_INTERFACE | grep inet | awk {'print $2'})
    sudo ip addr flush $NVP_GATEWAY_NETWORK_INTERFACE
    # Use the PUBLIC Bridge to route traffic to the NVP gateway
    # NOTE(armando-migliaccio): if running in a nested environment this will work
    # only with mac learning enabled, portsecurity and security profiles disabled
    # The public bridge might not exist for the NVP plugin if Q_USE_DEBUG_COMMAND is off
    # Try to create it anyway
    sudo ovs-vsctl --no-wait -- --may-exist add-br $PUBLIC_BRIDGE
    sudo ovs-vsctl -- --may-exist add-port $PUBLIC_BRIDGE $NVP_GATEWAY_NETWORK_INTERFACE
    nvp_gw_net_if_mac=$(ip link show $NVP_GATEWAY_NETWORK_INTERFACE | awk '/ether/ {print $2}')
    sudo ip link dev $PUBLIC_BRIDGE set address $nvp_gw_net_if_mac
    for address in $addresses; do
        sudo ip addr add dev $PUBLIC_BRIDGE $address
    done
    sudo ip addr add dev $PUBLIC_BRIDGE $NVP_GATEWAY_NETWORK_CIDR
}

function install_nicira() {
    :
}

function start_nicira() {
    :
}

function stop_nicira() {
    if ! is_set NVP_GATEWAY_NETWORK_CIDR; then
        NVP_GATEWAY_NETWORK_CIDR=$PUBLIC_NETWORK_GATEWAY/${FLOATING_RANGE#*/}
        echo "The IP address expected on br-ex was not specified. "
        echo "Defaulting to "$NVP_GATEWAY_NETWORK_CIDR
    fi
    sudo ip addr del $NVP_GATEWAY_NETWORK_CIDR dev $PUBLIC_BRIDGE
    # Save and then flush remaining addresses on the interface
    addresses=$(ip addr show dev $PUBLIC_BRIDGE | grep inet | awk {'print $2'})
    sudo ip addr flush $PUBLIC_BRIDGE
    # Try to detach physical interface from PUBLIC_BRIDGE
    sudo ovs-vsctl del-port $NVP_GATEWAY_NETWORK_INTERFACE
    # Restore addresses on NVP_GATEWAY_NETWORK_INTERFACE
    for address in $addresses; do
        sudo ip addr add dev $NVP_GATEWAY_NETWORK_INTERFACE $address
    done
}

# Restore xtrace
$MY_XTRACE