The tunnel test leaves behind link devices created by the GRE kernel
modules:
$ ip -br link
...
gre0@NONE DOWN 0.0.0.0 <NOARP>
gretap0@NONE DOWN 00:00:00:00:00:00 <BROADCAST,MULTICAST>
erspan0@NONE DOWN 00:00:00:00:00:00 <BROADCAST,MULTICAST>
ip6tnl0@NONE DOWN :: <NOARP>
ip6gre0@NONE DOWN 00:00:00:00:
$ lsmod | grep gre
ip6_gre 40960 0
ip6_tunnel 40960 1 ip6_gre
ip_gre 32768 0
ip_tunnel 24576 1 ip_gre
gre 16384 2 ip6_gre,ip_gre
Check beforehand if the gre kernel module is loaded, and if not unload
them all at the end of the test. This should avoid causing problems if
a user is already using GRE for other purposes.
Signed-off-by: Luca Boccassi <bluca@debian.org>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Tested-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
. lib/generic.sh
TUNNEL_NAME="tunnel_test_ip"
+KMODS="ip6_gre ip6_tunnel ip_gre ip_tunnel gre"
+
+# unload kernel modules to remove dummy interfaces only if they were not in use beforehand
+kmods_remove=
+# note that checkbashism reports command -v, but dash supports it and it's POSIX 2008 compliant
+if command -v lsmod >/dev/null 2>&1 && command -v rmmod >/dev/null 2>&1; then
+ for i in $KMODS; do
+ lsmod | grep -q "^$i" || kmods_remove="$kmods_remove $i";
+ done
+fi
ts_log "[Testing add/del tunnels]"
ts_ip "$0" "Add GRE tunnel over IPv6" tunnel add name $TUNNEL_NAME mode ip6gre local dead:beef::1 remote dead:beef::2
ts_ip "$0" "Del GRE tunnel over IPv6" tunnel del $TUNNEL_NAME
+for mod in $kmods_remove; do
+ sudo rmmod "$mod"
+done