From 033d2264ffc47ef591746048ba7b3ad54fcb0bd5 Mon Sep 17 00:00:00 2001
From: SAPikachu <sapikachu@gmail.com>
Date: Fri, 25 Jan 2019 15:53:24 +0800
Subject: [PATCH] Fix SO_MARK setting for UDP outbound connections

---
 transport/internet/sockopt_linux.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/transport/internet/sockopt_linux.go b/transport/internet/sockopt_linux.go
index 6c5afddd0..db1cda9c9 100644
--- a/transport/internet/sockopt_linux.go
+++ b/transport/internet/sockopt_linux.go
@@ -70,6 +70,11 @@ func applyOutboundSocketOptions(network string, address string, fd uintptr, conf
 }
 
 func applyInboundSocketOptions(network string, fd uintptr, config *SocketConfig) error {
+	if config.Mark != 0 {
+		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, int(config.Mark)); err != nil {
+			return newError("failed to set SO_MARK").Base(err)
+		}
+	}
 	if isTCPSocket(network) {
 		switch config.Tfo {
 		case SocketConfig_Enable: