From 249fab773dd5f689318c969ed649c4db077cdfc3 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 13 Dec 2010 12:16:14 -0800 Subject: [PATCH] net: add limits to ip_default_ttl ip_default_ttl should be between 1 and 255 Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/sysctl_net_ipv4.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index e85ff5930607..1a456652086b 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_min[] = { 1, 1 }; 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 @@ static struct ctl_table ipv4_table[] = { .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", -- 2.20.1