From efc252ff56c22d978a4fd1c635b7064200d2ea77 Mon Sep 17 00:00:00 2001
From: Marten Seemann <martenseemann@gmail.com>
Date: Mon, 26 Jun 2023 14:57:50 +0200
Subject: [PATCH] use the UDP_SEGMENT constant defined in the unix package (for
 GSO) (#3917)

---
 sys_conn_df_linux.go | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/sys_conn_df_linux.go b/sys_conn_df_linux.go
index f027b47ab..58f6f80ab 100644
--- a/sys_conn_df_linux.go
+++ b/sys_conn_df_linux.go
@@ -15,11 +15,6 @@ import (
 	"github.com/quic-go/quic-go/internal/utils"
 )
 
-// UDP_SEGMENT controls GSO (Generic Segmentation Offload)
-//
-//nolint:stylecheck
-const UDP_SEGMENT = 103
-
 func setDF(rawConn syscall.RawConn) (bool, error) {
 	// Enabling IP_MTU_DISCOVER will force the kernel to return "sendto: message too long"
 	// and the datagram will not be fragmented
@@ -51,7 +46,7 @@ func maybeSetGSO(rawConn syscall.RawConn) bool {
 
 	var setErr error
 	if err := rawConn.Control(func(fd uintptr) {
-		setErr = unix.SetsockoptInt(int(fd), syscall.IPPROTO_UDP, UDP_SEGMENT, 1)
+		setErr = unix.SetsockoptInt(int(fd), syscall.IPPROTO_UDP, unix.UDP_SEGMENT, 1)
 	}); err != nil {
 		setErr = err
 	}
@@ -73,7 +68,7 @@ func appendUDPSegmentSizeMsg(b []byte, size uint16) []byte {
 	b = append(b, make([]byte, unix.CmsgSpace(dataLen))...)
 	h := (*unix.Cmsghdr)(unsafe.Pointer(&b[startLen]))
 	h.Level = syscall.IPPROTO_UDP
-	h.Type = UDP_SEGMENT
+	h.Type = unix.UDP_SEGMENT
 	h.SetLen(unix.CmsgLen(dataLen))
 
 	// UnixRights uses the private `data` method, but I *think* this achieves the same goal.