[B.A.T.M.A.N.] [RFC v4 15/20] batctl: Support generic netlink for bridge_loop_avoidance command

[Sven Eckelmann <sven@narfation.org>]

sysfs should be avoided for new settings of network interfaces. To still
provide a common configuration infrastructure, all the existing settings
subcommands also have to be reimplemented via generic netlink while still
using sysfs as fallback.

The bridge_loop_avoidance implementation is using the commands
BATADV_CMD_SET_MESH/BATADV_CMD_GET_MESH to set/get the configuration of
the u8 (boolean) BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE attribute.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
Cc: Simon Wunderlich <sw@simonwunderlich.de>
---
 bridge_loop_avoidance.c | 46 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 44 insertions(+), 2 deletions(-)

diff --git a/bridge_loop_avoidance.c b/bridge_loop_avoidance.c
index 0db49f2..7831a19 100644
--- a/bridge_loop_avoidance.c
+++ b/bridge_loop_avoidance.c
@@ -21,13 +21,55 @@
  */
 
 #include "main.h"
+
+#include <errno.h>
+#include <linux/genetlink.h>
+#include <netlink/genl/genl.h>
+
+#include "batman_adv.h"
+#include "netlink.h"
 #include "sys.h"
 
+static struct simple_boolean_data bridge_loop_avoidance;
+
+static int print_bridge_loop_avoidance(struct nl_msg *msg, void *arg)
+{
+	return sys_simple_print_boolean(msg, arg,
+					BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE);
+}
+
+static int get_bridge_loop_avoidance(struct state *state)
+{
+	return sys_simple_nlquery(state, BATADV_CMD_GET_MESH,
+				  NULL, print_bridge_loop_avoidance);
+}
+
+static int set_attrs_bridge_loop_avoidance(struct nl_msg *msg, void *arg)
+{
+	struct state *state = arg;
+	struct settings_data *settings = state->cmd->arg;
+	struct simple_boolean_data *data = settings->data;
+
+	nla_put_u8(msg, BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE, data->val);
+
+	return 0;
+}
+
+static int set_bridge_loop_avoidance(struct state *state)
+{
+	return sys_simple_nlquery(state, BATADV_CMD_SET_MESH,
+				  set_attrs_bridge_loop_avoidance, NULL);
+}
+
 static struct settings_data batctl_settings_bridge_loop_avoidance = {
 	.sysfs_name = SYS_BLA,
-	.params = sysfs_param_enable,
+	.data = &bridge_loop_avoidance,
+	.parse = parse_simple_boolean,
+	.netlink_get = get_bridge_loop_avoidance,
+	.netlink_set = set_bridge_loop_avoidance,
 };
 
 COMMAND_NAMED(SUBCOMMAND, bridge_loop_avoidance, "bl", handle_sys_setting,
-	      COMMAND_FLAG_MESH_IFACE, &batctl_settings_bridge_loop_avoidance,
+	      COMMAND_FLAG_MESH_IFACE | COMMAND_FLAG_NETLINK,
+	      &batctl_settings_bridge_loop_avoidance,
 	      "[0|1]             \tdisplay or modify bridge_loop_avoidance setting");
-- 
2.19.2