From 2ecd6ff7a3390d86f40f062b177fe9babd676f22 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Sat, 20 Jun 2020 01:53:46 +0200
Subject: kubernetes: move kubeguard to kubeadm/base

---
 .../base/templates/net_kubeguard/ifupdown.sh.j2    | 55 ++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 roles/kubernetes/kubeadm/base/templates/net_kubeguard/ifupdown.sh.j2

(limited to 'roles/kubernetes/kubeadm/base/templates/net_kubeguard/ifupdown.sh.j2')

diff --git a/roles/kubernetes/kubeadm/base/templates/net_kubeguard/ifupdown.sh.j2 b/roles/kubernetes/kubeadm/base/templates/net_kubeguard/ifupdown.sh.j2
new file mode 100644
index 00000000..d8153102
--- /dev/null
+++ b/roles/kubernetes/kubeadm/base/templates/net_kubeguard/ifupdown.sh.j2
@@ -0,0 +1,55 @@
+#!/bin/bash
+
+set -e
+
+CONF_D="/var/lib/kubeguard/"
+
+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, kubeguard.node_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(kubeguard.node_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 "$TUN_IF" listen-port {{ kubeguard_wireguard_port | default(51820) }} private-key "$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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