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// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use super::ieee80211::{Ieee80211, MacAddress};
use super::packets::mac80211_hwsim::{
HwsimAttr, HwsimCmd, HwsimMsg, HwsimMsgHdr, TxRate, TxRateFlag,
};
use crate::wifi::hwsim_attr_set::HwsimAttrSet;
use anyhow::{anyhow, Context};
use log::{info, warn};
/// Parser for the hwsim Frame command (HWSIM_CMD_FRAME).
///
/// The Frame command is sent by the kernel's mac80211_hwsim subsystem
/// and contains the IEEE 802.11 frame along with hwsim attributes.
///
/// This module parses the required and optional hwsim attributes and
/// returns errors if any required attributes are missing.
// The Frame struct contains parsed attributes along with the raw and
// parsed 802.11 frame in `data` and `ieee80211.`
#[derive(Debug)]
pub struct Frame {
pub transmitter: MacAddress,
pub flags: u32,
pub tx_info: Vec<TxRate>,
pub cookie: u64,
pub signal: Option<u32>,
pub freq: Option<u32>,
pub data: Vec<u8>,
pub ieee80211: Ieee80211,
}
impl Frame {
// Builds and validates the Frame from the attributes in the
// packet. Called when a hwsim packet with HwsimCmd::Frame is
// found.
pub fn parse(msg: &HwsimMsg) -> anyhow::Result<Frame> {
// Only expected to be called with HwsimCmd::Frame
if (msg.hwsim_hdr.hwsim_cmd != HwsimCmd::Frame) {
panic!("Invalid hwsim_cmd");
}
let attrs = HwsimAttrSet::parse(&msg.attributes).context("HwsimAttrSet")?;
let frame = attrs.frame.clone().context("Frame")?;
let ieee80211 = Ieee80211::parse(&frame).context("Ieee80211")?;
// Required attributes are unwrapped and return an error if
// they are not present.
Ok(Frame {
transmitter: attrs.transmitter.context("transmitter")?,
flags: attrs.flags.context("flags")?,
tx_info: attrs.tx_info.clone().context("tx_info")?,
cookie: attrs.cookie.context("cookie")?,
signal: attrs.signal,
freq: attrs.freq,
data: frame,
ieee80211,
})
}
}
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