[PATCH] sysctl net: Keep tcp_syn_retries inside the boundary

[Michal Tesar]

Limit the min/max value passed to the
/proc/sys/net/ipv4/tcp_syn_retries.

Signed-off-by: Michal Tesar <mtesar@xxxxxxxxxx>
---
 net/ipv4/sysctl_net_ipv4.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index b2c123c..fdc2a17 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -36,6 +36,8 @@ 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;
+static int tcp_syn_retries_min = 1;
+static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
 static int ip_ping_group_range_min[] = { 0, 0 };
 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
 
@@ -332,7 +334,9 @@ static struct ctl_table ipv4_table[] = {
 		.data		= &sysctl_tcp_syn_retries,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec
+		.proc_handler	= proc_dointvec_minmax,
+        .extra1     = &tcp_syn_retries_min,
+        .extra2     = &tcp_syn_retries_max
 	},
 	{
 		.procname	= "tcp_synack_retries",
-- 
1.7.7.6

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