[LEDE-DEV] [PATCH] netifd: allow negative neighlocktime values

[Alin Nastac]

When -1 is written in /proc/sys/net/ipv4/neigh/<iface>/locktime,
kernel disables ARP trashing protection. A value of 0 does not completely
disable this protection, a second ARP update being discarded if it
is processed during the same jiffie as the first update.

Signed-off-by: Alin Nastac <alin.nastac at gmail.com>
---
 system-linux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/system-linux.c b/system-linux.c
index 483a98d..0bdc53d 100644
--- a/system-linux.c
+++ b/system-linux.c
@@ -1476,7 +1476,7 @@ system_if_apply_settings(struct device *dev, struct device_settings *s, unsigned
 		system_set_neigh6reachabletime(dev, buf);
 	}
 	if (s->flags & DEV_OPT_NEIGHLOCKTIME & apply_mask) {
-		snprintf(buf, sizeof(buf), "%u", s->neigh4locktime);
+		snprintf(buf, sizeof(buf), "%d", s->neigh4locktime);
 		system_set_neigh4locktime(dev, buf);
 	}
 	if (s->flags & DEV_OPT_NEIGHGCSTALETIME & apply_mask) {
-- 
2.7.4