Function sockErrCmsgToLinux

pkg/sentry/socket/socket.go:86–117

sockErrCmsgToLinux converts SockError control message from tcpip format to Linux format.

(sockErr *tcpip.SockError)

// sockErrCmsgToLinux converts SockError control message from tcpip format to
// Linux format.
func sockErrCmsgToLinux(sockErr *tcpip.SockError) linux.SockErrCMsg {
	if sockErr == nil {
		return nil
	}

	ee := linux.SockExtendedErr{
		Errno:  uint32(syserr.TranslateNetstackError(sockErr.Err).ToLinux()),
		Origin: errOriginToLinux(sockErr.Cause.Origin()),
		Type:   sockErr.Cause.Type(),
		Code:   sockErr.Cause.Code(),
		Info:   sockErr.Cause.Info(),
	}

	switch sockErr.NetProto {
	case header.IPv4ProtocolNumber:
		errMsg := &linux.SockErrCMsgIPv4{SockExtendedErr: ee}
		if len(sockErr.Offender.Addr.AsSlice()) > 0 {
			addr, _ := ConvertAddress(linux.AF_INET, sockErr.Offender)
			errMsg.Offender = *addr.(*linux.SockAddrInet)
		}
		return errMsg
	case header.IPv6ProtocolNumber:
		errMsg := &linux.SockErrCMsgIPv6{SockExtendedErr: ee}
		if len(sockErr.Offender.Addr.AsSlice()) > 0 {
			addr, _ := ConvertAddress(linux.AF_INET6, sockErr.Offender)
			errMsg.Offender = *addr.(*linux.SockAddrInet6)
		}
		return errMsg
	default:
		panic(fmt.Sprintf("invalid net proto for creating SockErrCMsg: %d", sockErr.NetProto))
	}
}

// NewIPControlMessages converts the tcpip.ReceivableControlMessages (which does
// not have Linux specific format) to Linux format.