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use the UDP_SEGMENT constant defined in the unix package (for GSO) (#3917)

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Marten Seemann 2023-06-26 14:57:50 +02:00 • committed by GitHub
parent d361637419
commit efc252ff56
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1 changed files with 2 additions and 7 deletions
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9
sys_conn_df_linux.go
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@ -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.