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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::MacAddress;
use super::packets::mac80211_hwsim::HwsimAttrChild::*;
use super::packets::mac80211_hwsim::{HwsimAttr, HwsimMsg, HwsimMsgHdr, TxRate, TxRateFlag};
use super::packets::netlink::{NlAttrHdr, NlMsgHdr};
use anyhow::{anyhow, Context};
use log::{info, warn};
// Decode the hwsim attributes into a set.
//
// Hwsim attributes are used to exchange data between kernel's
// mac80211_hwsim subsystem and this user space process and include:
//
// HWSIM_ATTR_ADDR_TRANSMITTER,
// HWSIM_ATTR_ADDR_RECEIVER,
// HWSIM_ATTR_FRAME,
// HWSIM_ATTR_FLAGS,
// HWSIM_ATTR_RX_RATE,
// HWSIM_ATTR_SIGNAL,
// HWSIM_ATTR_COOKIE,
// HWSIM_ATTR_FREQ (optional)
// HWSIM_ATTR_TX_INFO (new use)
// HWSIM_ATTR_TX_INFO_FLAGS (new use)
const NLA_ALIGNTO: usize = 4;
fn nla_align(len: usize) -> usize {
len.wrapping_add(NLA_ALIGNTO - 1) & !(NLA_ALIGNTO - 1)
}
#[derive(Default)]
struct HwsimAttrSetBuilder {
transmitter: Option<MacAddress>,
receiver: Option<MacAddress>,
frame: Option<Vec<u8>>,
flags: Option<u32>,
rx_rate_idx: Option<u32>,
signal: Option<u32>,
cookie: Option<u64>,
freq: Option<u32>,
tx_info: Option<Vec<TxRate>>,
tx_rate_flags: Option<Vec<TxRateFlag>>,
}
#[derive(Debug)]
pub struct HwsimAttrSet {
pub transmitter: Option<MacAddress>,
pub receiver: Option<MacAddress>,
pub frame: Option<Vec<u8>>,
pub flags: Option<u32>,
pub rx_rate_idx: Option<u32>,
pub signal: Option<u32>,
pub cookie: Option<u64>,
pub freq: Option<u32>,
pub tx_info: Option<Vec<TxRate>>,
pub tx_rate_flags: Option<Vec<TxRateFlag>>,
}
impl HwsimAttrSetBuilder {
fn transmitter(&mut self, transmitter: &[u8; 6]) -> &mut Self {
self.transmitter = Some(MacAddress::from(transmitter));
self
}
fn receiver(&mut self, receiver: &[u8; 6]) -> &mut Self {
self.receiver = Some(MacAddress::from(receiver));
self
}
fn frame(&mut self, frame: &[u8]) -> &mut Self {
self.frame = Some(frame.to_vec());
self
}
fn flags(&mut self, flags: u32) -> &mut Self {
self.flags = Some(flags);
self
}
fn rx_rate(&mut self, rx_rate_idx: u32) -> &mut Self {
self.rx_rate_idx = Some(rx_rate_idx);
self
}
fn signal(&mut self, signal: u32) -> &mut Self {
self.signal = Some(signal);
self
}
fn cookie(&mut self, cookie: u64) -> &mut Self {
self.cookie = Some(cookie);
self
}
fn freq(&mut self, freq: u32) -> &mut Self {
self.freq = Some(freq);
self
}
fn tx_info(&mut self, tx_info: &[TxRate]) -> &mut Self {
self.tx_info = Some(tx_info.to_vec());
self
}
fn tx_rate_flags(&mut self, tx_rate_flags: &[TxRateFlag]) -> &mut Self {
self.tx_rate_flags = Some(tx_rate_flags.to_vec());
self
}
fn build(mut self) -> anyhow::Result<HwsimAttrSet> {
Ok(HwsimAttrSet {
transmitter: self.transmitter,
receiver: self.receiver,
cookie: self.cookie,
flags: self.flags,
rx_rate_idx: self.rx_rate_idx,
signal: self.signal,
frame: self.frame,
freq: self.freq,
tx_info: self.tx_info,
tx_rate_flags: self.tx_rate_flags,
})
}
}
impl HwsimAttrSet {
fn builder() -> HwsimAttrSetBuilder {
HwsimAttrSetBuilder::default()
}
// Builds and validates the attributes in the command.
pub fn parse(attributes: &[u8]) -> anyhow::Result<HwsimAttrSet> {
let mut index: usize = 0;
let mut builder = HwsimAttrSet::builder();
while (index < attributes.len()) {
// Parse a generic netlink attribute to get the size
let nla = NlAttrHdr::parse(&attributes[index..index + 4]).unwrap();
let nla_len = nla.nla_len as usize;
let hwsim_attr = HwsimAttr::parse(&attributes[index..index + nla_len])?;
match hwsim_attr.specialize() {
HwsimAttrAddrTransmitter(child) => builder.transmitter(child.get_address()),
HwsimAttrAddrReceiver(child) => builder.receiver(child.get_address()),
HwsimAttrFrame(child) => builder.frame(child.get_data()),
HwsimAttrFlags(child) => builder.flags(child.get_flags()),
HwsimAttrRxRate(child) => builder.rx_rate(child.get_rx_rate_idx()),
HwsimAttrSignal(child) => builder.signal(child.get_signal()),
HwsimAttrCookie(child) => builder.cookie(child.get_cookie()),
HwsimAttrFreq(child) => builder.freq(child.get_freq()),
HwsimAttrTxInfo(child) => builder.tx_info(child.get_tx_rates()),
HwsimAttrTxInfoFlags(child) => builder.tx_rate_flags(child.get_tx_rate_flags()),
_ => {
return Err(anyhow!(
"Invalid attribute message: {:?}",
hwsim_attr.get_nla_type() as u32
))
}
};
// Manually step through the attribute bytes aligning as
// we go because netlink aligns each attribute which isn't
// a feature of PDL parser.
index += nla_align(nla_len);
}
builder.build()
}
}
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