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#!/bin/sh
# NetworkManager device handler for geneve interfaces.
#
# Put this script in "/etc/NetworkManager/dispatcher.d/device" and
# create a generic connection with:
#
# nmcli connection add type generic \
# con-name geneve1 \
# ifname geneve1 \
# generic.device-handler geneve \
# connection.autoconnect no
#
# Then add the following parameters at the bottom of file
# /etc/NetworkManager/system-connections/geneve1 , and do a "nmcli
# connection reload".
#
# [user]
# geneve.remote=172.25.14.15
# geneve.vni=5555
# geneve.dstport=6082
#
# Now, when activating connection "geneve1", NetworkManager calls this
# script to create the device according to parameters in the user
# settings, and then performs IP configuration on it.
#
# This script will use the following properties from the [user] setting:
#
# - geneve.remote (required)
# - geneve.vni (required)
# - geneve.ttl
# - geneve.dstport
#
# See the GENEVE section of "man ip-link" for more details.
ifname=$1
action=$2
require()
{
if ! command -v "$1" > /dev/null ; then
echo "ERROR='$1' is not installed"
exit 1
fi
}
get_iplink_param()
{
ip -j -d link show "$1" | jq -r .[0].linkinfo.info_data."$2"
}
require jq
if [ "$action" = device-add ]; then
# Create the interface here and then write a line to stdout
# containing "IFINDEX=" followed by the ifindex of the interface
# just created, so that NetworkManager can manage it and configure
# IPs on the interface. The name of the returned ifindex must be
# the same as "$ifname".
vni=$CONNECTION_USER_GENEVE__VNI
remote=$CONNECTION_USER_GENEVE__REMOTE
ttl=$CONNECTION_USER_GENEVE__TTL
dstport=$CONNECTION_USER_GENEVE__DSTPORT
if [ -z "$vni" ] || [ -z "$remote" ]; then
echo "ERROR=Missing VNI or remote"
exit 2
fi
if [ -d /sys/class/net/"$ifname" ]; then
# If the interface already exists, reuse it after checking
# that the parameters are compatible.
# NOTE: it's not strictly necessary to handle an already
# existing interface, but if the script doesn't, it won't be
# possible to re-activate the connection when it's up.
if [ "$vni" != "$(get_iplink_param "$ifname" id)" ]; then
echo "ERROR=The link already exists with different VNI"
exit 3
fi
if [ "$remote" != "$(get_iplink_param "$ifname" remote)" ]; then
echo "ERROR=The link already exists with different remote"
exit 3
fi
if [ -n "$ttl" ] && [ "$ttl" != "$(get_iplink_param "$ifname" ttl)" ]; then
echo "ERROR=The link already exists with different TTL"
exit 3
fi
if [ -n "$dstport" ] && [ "$dstport" != "$(get_iplink_param "$ifname" port)" ]; then
echo "ERROR=The link already exists with different dstport"
exit 3
fi
echo IFINDEX="$(cat /sys/class/net/"$ifname"/ifindex)"
exit 0
fi
# The interface doesn't exist, create it
if ! err=$(ip link add "$ifname" type geneve vni "$vni" remote "$remote" \
${tos:+tos "$tos"} \
${ttl:+ttl "$ttl"} \
${dstport:+dstport "$dstport"} 2>&1); then
echo "ERROR=Failed creating the interface: $err"
exit 4
fi
echo IFINDEX="$(cat /sys/class/net/"$ifname"/ifindex)"
exit 0
elif [ "$action" = device-delete ]; then
# NM automatically deletes the link on deactivation,
# it's not necessary to do it here. The "device-delete"
# action can be used to perform additional operations.
exit 0
fi
exit 5
|
