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#!/bin/bash
set -e
CONF_D="/var/lib/kubenet/"
INET_IF="{{ ansible_default_ipv4.interface }}"
POD_NET_CIDR="{{ kubernetes.pod_ip_range }}"
{% set br_net = kubernetes.pod_ip_range | ipsubnet(kubernetes.pod_ip_range_size, kubernetes.net_index[inventory_hostname]) -%}
BR_IF="kube-br0"
BR_IP="{{ br_net | ipaddr(1) | ipaddr('address') }}"
BR_IP_CIDR="{{ br_net | ipaddr(1) }}"
BR_NET_CIDR="{{ br_net }}"
TUN_IF="kube-wg0"
TUN_IP_CIDR="{{ kubernetes.pod_ip_range | ipsubnet(kubernetes.pod_ip_range_size, 0) | ipaddr(kubernetes.net_index[inventory_hostname]) }}"
case "$1" in
up)
# bring up bridge for local pods
ip link add dev "$BR_IF" type bridge
ip addr add dev "$BR_IF" "$BR_IP_CIDR"
ip link set up dev "$BR_IF"
iptables -t nat -A POSTROUTING -s "$BR_NET_CIDR" -o "$INET_IF" -j MASQUERADE
modprobe br_netfilter
# bring up wireguard tunnel to other nodes
ip link add dev "$TUN_IF" type wireguard
ip addr add dev "$TUN_IF" "$TUN_IP_CIDR"
wg set "$TUN_IF" listen-port {{ kubenet_wireguard_port }} private-key "$CONF_D/$TUN_IF.privatekey"
ip link set up dev "$TUN_IF"
# make pods and service IPs reachable
# !!! use IP of bridge as source so we don't produce martians if direct-zones are involved!!!
ip route add "$POD_NET_CIDR" dev "$TUN_IF" src "$BR_IP"
;;
down)
# bring down wireguard tunnel to other nodes
ip route del "$POD_NET_CIDR" dev "$TUN_IF"
ip link del dev "$TUN_IF"
# bring down bridge for local pods
iptables -t nat -D POSTROUTING -s "$BR_NET_CIDR" -o "$INET_IF" -j MASQUERADE
ip link del dev "$BR_IF"
;;
*)
echo "usage: $0 (up|down)"
exit 1
;;
esac
exit 0
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