From 076074fa02f4ba33f798c2053771e4827fd1c35f Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Wed, 22 Jul 2020 23:01:37 +0200
Subject: add some more interface configs

---
 inventory/host_vars/ch-oulu-vm1.yml                   | 11 ++++++++++-
 .../network/templates/interfaces/multihomed-base.j2   | 18 ++++++++++++++++++
 .../templates/interfaces/multihomed-overlay.j2        | 19 +++++++++++++++++++
 .../vm/guest/network/templates/interfaces/overlay.j2  |  2 +-
 4 files changed, 48 insertions(+), 2 deletions(-)
 create mode 100644 roles/vm/guest/network/templates/interfaces/multihomed-base.j2
 create mode 100644 roles/vm/guest/network/templates/interfaces/multihomed-overlay.j2

diff --git a/inventory/host_vars/ch-oulu-vm1.yml b/inventory/host_vars/ch-oulu-vm1.yml
index b760cde5..a02a1d77 100644
--- a/inventory/host_vars/ch-oulu-vm1.yml
+++ b/inventory/host_vars/ch-oulu-vm1.yml
@@ -26,7 +26,16 @@ network:
     name: lan0
     address: "{{ network_zones.lan.prefix | ipaddr(network_zones.lan.offsets[inventory_hostname]) | ipaddr('address/prefix') }}"
     gateway: "{{ network_zones.lan.gateway }}"
+    config: multihomed-base
   interfaces:
   - *_network_primary_
   - name: svc0
-    address: 1.2.3.4/24
+    address: 192.168.3.1/24
+    config: multihomed-overlay
+    overlays:
+    - name: mur.at
+      address: 1.2.3.4/28
+      gateway: 1.2.3.1
+    - name: magenta
+      address: 5.6.7.8/27
+      gateway: 5.6.7.1
diff --git a/roles/vm/guest/network/templates/interfaces/multihomed-base.j2 b/roles/vm/guest/network/templates/interfaces/multihomed-base.j2
new file mode 100644
index 00000000..db16d15f
--- /dev/null
+++ b/roles/vm/guest/network/templates/interfaces/multihomed-base.j2
@@ -0,0 +1,18 @@
+  address {{ interface.address | ipaddr('address') }}
+  netmask {{ interface.address | ipaddr('netmask') }}
+{% for route in interface.static_routes | default([]) %}
+  up /bin/ip route add {{ route.destination }} via {{ route.gateway }}{% if 'source' in route %} src {{ route.source }}{% endif %}{% if 'table' in route %} table {{ route.table }}{% endif %}
+{% endfor %}
+{% if 'gateway' in interface %}
+  up /bin/ip route add default via {{ interface.gateway }} table default
+{% endif %}
+  up /bin/ip rule add pref 42000 lookup default
+  up /bin/ip rule del pref 32767
+  down /bin/ip rule add pref 32767 lookup default
+  down /bin/ip rule del pref 42000
+{% if 'gateway' in interface %}
+  down /bin/ip route del default via {{ interface.gateway }} table default
+{% endif %}
+{% for route in interface.static_routes | default([]) | reverse %}
+  down /bin/ip route del {{ route.destination }} via {{ route.gateway }}{% if 'source' in route %} src {{ route.source }}{% endif %}{% if 'table' in route %} table {{ route.table }}{% endif %}
+{% endfor %}
diff --git a/roles/vm/guest/network/templates/interfaces/multihomed-overlay.j2 b/roles/vm/guest/network/templates/interfaces/multihomed-overlay.j2
new file mode 100644
index 00000000..7ac94246
--- /dev/null
+++ b/roles/vm/guest/network/templates/interfaces/multihomed-overlay.j2
@@ -0,0 +1,19 @@
+  address {{ interface.address | ipaddr('address') }}
+  netmask {{ interface.address | ipaddr('netmask') }}
+{% for overlay in interface.overlays %}
+{%   if 'name' in overlay %}
+  ## {{ overlay.name }}
+{%   endif %}
+  up /bin/ip addr add dev $IFACE {{ overlay.address }}
+  up /bin/ip route add default via {{ overlay.gateway }} src {{ overlay.address | ipaddr('address') }} table {{ 200 + loop.index0 }}
+  up /bin/ip rule add pref {{ 40000 + loop.index0 }} from {{ overlay.address | ipaddr('address') }} lookup {{ 200 + loop.index0 }}
+{% endfor %}
+  ##########
+{% for overlay in interface.overlays | reverse %}
+{%   if 'name' in overlay %}
+  ## {{ overlay.name }}
+{%   endif %}
+  down /bin/ip rule del pref {{ 40000 + loop.revindex0 }}
+  down /bin/ip route del default via {{ overlay.gateway }} src {{ overlay.address | ipaddr('address') }} table {{ 200 + loop.revindex0 }}
+  down /bin/ip addr del dev $IFACE {{ overlay.address }}
+{% endfor %}
diff --git a/roles/vm/guest/network/templates/interfaces/overlay.j2 b/roles/vm/guest/network/templates/interfaces/overlay.j2
index a3262f9c..0524c5df 100644
--- a/roles/vm/guest/network/templates/interfaces/overlay.j2
+++ b/roles/vm/guest/network/templates/interfaces/overlay.j2
@@ -7,8 +7,8 @@
 {% if 'gateway' in interface %}
   up /bin/ip route add default via {{ interface.gateway }} src {{ interface.overlay }}
   down /bin/ip route del default via {{ interface.gateway }} src {{ interface.overlay }}
+{% endif %}
 {% for route in interface.static_routes | default([]) | reverse %}
   down /bin/ip route del {{ route.destination }} via {{ route.gateway }}{% if 'source' in route %} src {{ route.source }}{% endif %}
 {% endfor %}
-{% endif %}
   down /bin/ip addr del dev $IFACE {{ interface.overlay }}/32
-- 
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