net: add limits to ip_default_ttl
ip_default_ttl should be between 1 and 255
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index e85ff59..1a45665 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -28,6 +28,8 @@
static int ip_local_port_range_max[] = { 65535, 65535 };
static int tcp_adv_win_scale_min = -31;
static int tcp_adv_win_scale_max = 31;
+static int ip_ttl_min = 1;
+static int ip_ttl_max = 255;
/* Update system visible IP port range */
static void set_local_port_range(int range[2])
@@ -155,8 +157,9 @@
.data = &sysctl_ip_default_ttl,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = proc_dointvec,
- .extra2 = &init_net,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &ip_ttl_min,
+ .extra2 = &ip_ttl_max,
},
{
.procname = "ip_no_pmtu_disc",