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move set DF implementation to separate files & avoid the need for OOBCapablePacketConn (#3334)

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* move set DF implementation to separate files & avoid the need for OOBCapablePacketConn

* merge err_size_* into conn_df_* & fix format
This commit is contained in:
Toby
2022-03-07 06:21:23 -08:00
committed by GitHub
parent fa070e585e
commit ad1cb27c1b
10 changed files with 106 additions and 85 deletions
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46
conn_df_windows.go Normal file
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@@ -0,0 +1,46 @@
//go:build windows
// +build windows
package quic
import (
"errors"
"syscall"
"github.com/lucas-clemente/quic-go/internal/utils"
"golang.org/x/sys/windows"
)
const (
// same for both IPv4 and IPv6 on Windows
// https://microsoft.github.io/windows-docs-rs/doc/windows/Win32/Networking/WinSock/constant.IP_DONTFRAG.html
// https://microsoft.github.io/windows-docs-rs/doc/windows/Win32/Networking/WinSock/constant.IPV6_DONTFRAG.html
IP_DONTFRAGMENT = 14
IPV6_DONTFRAG = 14
)
func setDF(rawConn syscall.RawConn) error {
var errDFIPv4, errDFIPv6 error
if err := rawConn.Control(func(fd uintptr) {
errDFIPv4 = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IP, IP_DONTFRAGMENT, 1)
errDFIPv6 = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IPV6, IPV6_DONTFRAG, 1)
}); 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://docs.microsoft.com/en-us/windows/win32/winsock/windows-sockets-error-codes-2
return errors.Is(err, windows.WSAEMSGSIZE)
}