From 54f7a59a917d3b16b25340b62294b969e28d3f10 Mon Sep 17 00:00:00 2001
From: lanrenwo <lanrenwo@users.noreply.github.com>
Date: Tue, 14 Jun 2022 14:40:19 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0mtu=E7=9A=84=E9=85=8D?=
 =?UTF-8?q?=E7=BD=AE=E5=8F=82=E6=95=B0?=
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---
 server/base/cfg.go             | 1 +
 server/base/config.go          | 1 +
 server/conf/server-sample.toml | 4 ++++
 server/sessdata/session.go     | 5 ++++-
 4 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/server/base/cfg.go b/server/base/cfg.go
index 49a9c92..5690f08 100644
--- a/server/base/cfg.go
+++ b/server/base/cfg.go
@@ -66,6 +66,7 @@ type ServerConfig struct {
 	CstpDpd         int    `json:"cstp_dpd"`       // Dead peer detection in seconds
 	MobileKeepalive int    `json:"mobile_keepalive"`
 	MobileDpd       int    `json:"mobile_dpd"`
+	Mtu             int    `json:"mtu"`
 
 	SessionTimeout int `json:"session_timeout"` // in seconds
 	// AuthTimeout    int `json:"auth_timeout"`    // in seconds
diff --git a/server/base/config.go b/server/base/config.go
index b7edc7b..bdb6dc1 100644
--- a/server/base/config.go
+++ b/server/base/config.go
@@ -54,6 +54,7 @@ var configs = []config{
 	{Typ: cfgInt, Name: "cstp_dpd", Usage: "死链接检测时间(秒)", ValInt: 30},
 	{Typ: cfgInt, Name: "mobile_keepalive", Usage: "移动端keepalive接检测时间(秒)", ValInt: 50},
 	{Typ: cfgInt, Name: "mobile_dpd", Usage: "移动端死链接检测时间(秒)", ValInt: 60},
+	{Typ: cfgInt, Name: "mtu", Usage: "最大传输单元MTU", ValInt: 1460},
 	{Typ: cfgInt, Name: "session_timeout", Usage: "session过期时间(秒)", ValInt: 3600},
 	// {Typ: cfgInt, Name: "auth_timeout", Usage: "auth_timeout", ValInt: 0},
 	{Typ: cfgInt, Name: "audit_interval", Usage: "审计去重间隔(秒),-1关闭", ValInt: -1},
diff --git a/server/conf/server-sample.toml b/server/conf/server-sample.toml
index 402e03f..13a8835 100644
--- a/server/conf/server-sample.toml
+++ b/server/conf/server-sample.toml
@@ -60,6 +60,10 @@ cstp_keepalive = 20
 cstp_dpd = 30
 mobile_keepalive = 40
 mobile_dpd = 50
+
+#设置最大传输单元
+mtu = 1460
+
 #session过期时间，用于断线重连，0永不过期
 session_timeout = 3600
 auth_timeout = 0
diff --git a/server/sessdata/session.go b/server/sessdata/session.go
index 97d6e3e..f165247 100644
--- a/server/sessdata/session.go
+++ b/server/sessdata/session.go
@@ -294,9 +294,12 @@ func (cs *ConnSession) ratePeriod() {
 	}
 }
 
-const MaxMtu = 1460
+var MaxMtu = 1460
 
 func (cs *ConnSession) SetMtu(mtu string) {
+	if base.Cfg.Mtu > 0 {
+		MaxMtu = base.Cfg.Mtu
+	}
 	cs.Mtu = MaxMtu
 
 	mi, err := strconv.Atoi(mtu)