netdev - [net-next][PATCH] tcp: probe timer MUST not less than 5 minuter for tcp PMTU

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Message-Id: <1527851039-6626-1-git-send-email-lirongqing@baidu.com>
Date:   Fri,  1 Jun 2018 19:03:59 +0800
From:   Li RongQing <lirongqing@...du.com>
To:     netdev@...r.kernel.org
Subject: [net-next][PATCH] tcp: probe timer MUST not less than 5 minuter for tcp PMTU

RFC4821 say: The value for this timer MUST NOT be less than
5 minutes and is recommended to be 10 minutes, per RFC 1981.

Signed-off-by: Li RongQing <lirongqing@...du.com>
---
 net/ipv4/sysctl_net_ipv4.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index d2eed3ddcb0a..ed8952bb6874 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -47,6 +47,7 @@ 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 };
 static int comp_sack_nr_max = 255;
+static int tcp_probe_interval_min = 300;
 
 /* obsolete */
 static int sysctl_tcp_low_latency __read_mostly;
@@ -711,7 +712,8 @@ static struct ctl_table ipv4_net_table[] = {
 		.data		= &init_net.ipv4.sysctl_tcp_probe_interval,
 		.maxlen		= sizeof(int),
 		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &tcp_probe_interval_min,
 	},
 	{
 		.procname	= "igmp_link_local_mcast_reports",
-- 
2.16.2