tunnel executor: Add support for ip6gretap tunnels

Signed-off-by: Maximilian Wilhelm <max@sdn.clinic>

executor-scripts/linux/tunnel

@@ -23,15 +23,23 @@ esac
 # and therefor require 'type' keyword instead of 'mode'
 OBJECT="tunnel"
 TYPE_KW="mode"
-if [ "${IF_TUNNEL_MODE}" = "gretap" ]; then
+case "${IF_TUNNEL_MODE}" in
+*gretap)
 	OBJECT="link"
 	TYPE_KW="type"
-fi
 
+	# Strip possible "ip6" from tunnel mode
+	TUNNEL_MODE="gretap"
+	;;
+
+*)
 	# Store tunnel type/mode separaltely and unset input variable to exclude it
 	# from PARAMS below
 	TUNNEL_MODE="$IF_TUNNEL_MODE"
 	unset IF_TUNNEL_MODE
+	;;
+esac
+
 
 # Mangle residual IF_TUNNEL_* params into single string
 PARAMS=$(set | sed -E '

tests/linux/tunnel_test

@@ -7,7 +7,8 @@ tests_init \
 	tunnel_bringup \
 	tunnel_teardown \
 	gretap_up \
-	gretap_down
+	gretap_down \
+	ip6gretap_up
 
 tunnel_bringup_body() {
 	export MOCK=echo IFACE=tun0 PHASE=create IF_TUNNEL_MODE=gre \
@@ -50,3 +51,15 @@ gretap_down_body() {
 		-o match:"ip -4 link del foo" \
 		${EXECUTOR}
 }
+
+ip6gretap_up_body() {
+	export MOCK=echo IFACE=foo PHASE=create IF_TUNNEL_MODE=ip6gretap \
+		IF_TUNNEL_LOCAL=2001:db8::aaaa IF_TUNNEL_REMOTE=2001:db8::eeee
+	atf_check -s exit:0 \
+		-o match:"ip -6 link add foo" \
+		-o match:"type gretap" \
+		-o match:"local '2001:db8::aaaa'" \
+		-o match:"remote '2001:db8::eeee'" \
+		${EXECUTOR}
+}
+