pppoe: T2219: move adding of default route to ip-(up|down) script

As PPPoE interfaces should be part of a VRF it is required that the default
can also be set into the specified VRF. The default way of PPP by setting the
"defaultroute" option does not take a VRF into account. In this case PPP
installs a Kernel route forwarding all default traffic over this interface.

This change installs a static route with metric 1 instead into the routing
table via FRR. This is not the same as a Kernel route in terms of metric 1
compared to 0 but it should do the trick.

1 files changed, 33 insertions, 0 deletions

diff --git a/data/templates/pppoe/ip-up.script.tmpl b/data/templates/pppoe/ip-up.script.tmpl
new file mode 100644
index 000000000..c6aa02e9e
--- /dev/null
+++ b/data/templates/pppoe/ip-up.script.tmpl
@@ -0,0 +1,33 @@
+#!/bin/sh
+
+# As PPPoE is an "on demand" interface we need to re-configure it when it
+# becomes up
+if [ "$6" != "{{ intf }}" ]; then
+    exit
+fi
+
+# add some info to syslog
+DIALER_PID=$(cat /var/run/{{ intf }}.pid)
+logger -t pppd[$DIALER_PID] "executing $0"
+
+# Debian PPP version has no support for replacing an existing default route
+# thus we emulate this ba an ip-up script https://phabricator.vyos.net/T2220.
+
+{% if 'auto' in default_route -%}
+
+# only insert a new default route if there is no default route configured
+routes=$(vtysh -c "show running-config" | sed -n "/ip route/,/!/p" | grep 0.0.0.0/0 | wc -l)
+if [ "$routes" -eq 0 ]; then
+    # No VRF, use default routing table
+    vtysh -c "conf t" -c "ip route 0.0.0.0/0 {{ intf }}"
+fi
+
+{% elif 'force' in default_route -%}
+
+# Retrieve current static default routes and remove it from the routing table
+vtysh -c "show running-config" | sed -n "/ip route/,/!/p" | grep 0.0.0.0/0 | while read route ; do
+    vtysh -c "conf t" -c "no ${route}"
+done
+# No VRF, use default routing table
+vtysh -c "conf t" -c "ip route 0.0.0.0/0 {{ intf }}"
+{% endif %}