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rename files dealing with low level conns to sys_conn

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This commit is contained in:
Marten Seemann 2022-03-27 10:03:18 +01:00
parent f68b38635a
commit 3126062aa7
14 changed files with 9 additions and 2 deletions
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40
sys_conn_df_linux.go Normal file
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@ -0,0 +1,40 @@
//go:build linux
// +build linux
package quic
import (
"errors"
"syscall"
"github.com/lucas-clemente/quic-go/internal/utils"
"golang.org/x/sys/unix"
)
func setDF(rawConn syscall.RawConn) error {
// Enabling IP_MTU_DISCOVER will force the kernel to return "sendto: message too long"
// and the datagram will not be fragmented
var errDFIPv4, errDFIPv6 error
if err := rawConn.Control(func(fd uintptr) {
errDFIPv4 = unix.SetsockoptInt(int(fd), unix.IPPROTO_IP, unix.IP_MTU_DISCOVER, unix.IP_PMTUDISC_DO)
errDFIPv6 = unix.SetsockoptInt(int(fd), unix.IPPROTO_IPV6, unix.IPV6_MTU_DISCOVER, unix.IPV6_PMTUDISC_DO)
}); err != nil {
return err
}
switch {
case errDFIPv4 == nil && errDFIPv6 == nil:
utils.DefaultLogger.Debugf("Setting DF for IPv4 and IPv6.")
case errDFIPv4 == nil && errDFIPv6 != nil:
utils.DefaultLogger.Debugf("Setting DF for IPv4.")
case errDFIPv4 != nil && errDFIPv6 == nil:
utils.DefaultLogger.Debugf("Setting DF for IPv6.")
case errDFIPv4 != nil && errDFIPv6 != nil:
return errors.New("setting DF failed for both IPv4 and IPv6")
}
return nil
}
func isMsgSizeErr(err error) bool {
// https://man7.org/linux/man-pages/man7/udp.7.html
return errors.Is(err, unix.EMSGSIZE)
}