bypass-lan: Configure interface on bypass policy

Currently, only the kernel-netlink plugin supports this, the others will
just ignore it.

src/libcharon/plugins/bypass_lan/bypass_lan_listener.c

@@ -51,6 +51,7 @@ typedef struct {
 	private_bypass_lan_listener_t *listener;
 	host_t *net;
 	uint8_t mask;
+	char *iface;
 	child_cfg_t *cfg;
 } bypass_policy_t;
 
@@ -72,6 +73,7 @@ static void bypass_policy_destroy(bypass_policy_t *this)
 		ts->destroy(ts);
 	}
 	this->net->destroy(this->net);
+	free(this->iface);
 	free(this);
 }
 
@@ -115,6 +117,7 @@ static job_requeue_t update_bypass(private_bypass_lan_listener_t *this)
 		INIT(lookup,
 			.net = net->clone(net),
 			.mask = mask,
+			.iface = strdupnull(iface),
 		);
 		seen->put(seen, lookup, lookup);
 
@@ -123,6 +126,7 @@ static job_requeue_t update_bypass(private_bypass_lan_listener_t *this)
 		{
 			child_cfg_create_t child = {
 				.mode = MODE_PASS,
+				.interface = iface,
 			};
 			child_cfg_t *cfg;
 			traffic_selector_t *ts;
@@ -130,7 +134,7 @@ static job_requeue_t update_bypass(private_bypass_lan_listener_t *this)
 
 			ts = traffic_selector_create_from_subnet(net->clone(net), mask,
 													 0, 0, 65535);
-			snprintf(name, sizeof(name), "Bypass LAN %R", ts);
+			snprintf(name, sizeof(name), "Bypass LAN %R [%s]", ts, iface ?: "");
 
 			cfg = child_cfg_create(name, &child);
 			cfg->add_traffic_selector(cfg, FALSE, ts->clone(ts));
@@ -141,6 +145,7 @@ static job_requeue_t update_bypass(private_bypass_lan_listener_t *this)
 			INIT(found,
 				.net = net->clone(net),
 				.mask = mask,
+				.iface = strdupnull(iface),
 				.cfg = cfg,
 			);
 			this->policies->put(this->policies, found, found);