rs-matter/matter/src/transport/core.rs

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/*
*
* Copyright (c) 2020-2022 Project CHIP Authors
*
* 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
*
* http://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 log::info;
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use crate::{error::*, CommissioningData, Matter};
use crate::secure_channel::common::PROTO_ID_SECURE_CHANNEL;
use crate::secure_channel::core::SecureChannel;
use crate::transport::mrp::ReliableMessage;
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use crate::transport::{exchange, network::Address, packet::Packet};
use super::proto_ctx::ProtoCtx;
use super::session::CloneData;
enum RecvState {
New,
OpenExchange,
AddSession(CloneData),
EvictSession,
EvictSession2(CloneData),
Ack,
}
pub enum RecvAction<'r, 'p> {
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Send(Address, &'r [u8]),
Interact(ProtoCtx<'r, 'p>),
}
pub struct RecvCompletion<'r, 'a, 'p> {
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transport: &'r mut Transport<'a>,
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rx: Packet<'p>,
tx: Packet<'p>,
state: RecvState,
}
impl<'r, 'a, 'p> RecvCompletion<'r, 'a, 'p> {
pub fn next_action(&mut self) -> Result<Option<RecvAction<'_, 'p>>, Error> {
loop {
// Polonius will remove the need for unsafe one day
let this = unsafe { (self as *mut RecvCompletion).as_mut().unwrap() };
if let Some(action) = this.maybe_next_action()? {
return Ok(action);
}
}
}
fn maybe_next_action(&mut self) -> Result<Option<Option<RecvAction<'_, 'p>>>, Error> {
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self.transport.exch_mgr.purge();
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self.tx.reset();
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let (state, next) = match core::mem::replace(&mut self.state, RecvState::New) {
RecvState::New => {
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self.transport
.exch_mgr
.get_sess_mgr()
.decode(&mut self.rx)?;
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(RecvState::OpenExchange, None)
}
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RecvState::OpenExchange => match self.transport.exch_mgr.recv(&mut self.rx) {
Ok(Some(exch_ctx)) => {
if self.rx.get_proto_id() == PROTO_ID_SECURE_CHANNEL {
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let mut proto_ctx = ProtoCtx::new(exch_ctx, &self.rx, &mut self.tx);
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let mut secure_channel = SecureChannel::new(self.transport.matter);
let (reply, clone_data) = secure_channel.handle(&mut proto_ctx)?;
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let state = if let Some(clone_data) = clone_data {
RecvState::AddSession(clone_data)
} else {
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RecvState::Ack
};
if reply {
if proto_ctx.send()? {
(
state,
Some(Some(RecvAction::Send(self.tx.peer, self.tx.as_slice()))),
)
} else {
(state, None)
}
} else {
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(state, None)
}
} else {
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let proto_ctx = ProtoCtx::new(exch_ctx, &self.rx, &mut self.tx);
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(RecvState::Ack, Some(Some(RecvAction::Interact(proto_ctx))))
}
}
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Ok(None) => (RecvState::Ack, None),
Err(e) => match e.code() {
ErrorCode::Duplicate => (RecvState::Ack, None),
ErrorCode::NoSpace => (RecvState::EvictSession, None),
_ => Err(e)?,
},
},
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RecvState::AddSession(clone_data) => {
match self.transport.exch_mgr.add_session(&clone_data) {
Ok(_) => (RecvState::Ack, None),
Err(e) => match e.code() {
ErrorCode::NoSpace => (RecvState::EvictSession2(clone_data), None),
_ => Err(e)?,
},
}
}
RecvState::EvictSession => {
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if self.transport.exch_mgr.evict_session(&mut self.tx)? {
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(
RecvState::OpenExchange,
Some(Some(RecvAction::Send(self.tx.peer, self.tx.as_slice()))),
)
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} else {
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(RecvState::EvictSession, None)
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}
}
RecvState::EvictSession2(clone_data) => {
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if self.transport.exch_mgr.evict_session(&mut self.tx)? {
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(
RecvState::AddSession(clone_data),
Some(Some(RecvAction::Send(self.tx.peer, self.tx.as_slice()))),
)
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} else {
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(RecvState::EvictSession2(clone_data), None)
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}
}
RecvState::Ack => {
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if let Some(exch_id) = self.transport.exch_mgr.pending_ack() {
info!("Sending MRP Standalone ACK for exch {}", exch_id);
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ReliableMessage::prepare_ack(exch_id, &mut self.tx);
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if self.transport.exch_mgr.send(exch_id, &mut self.tx)? {
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(
RecvState::Ack,
Some(Some(RecvAction::Send(self.tx.peer, self.tx.as_slice()))),
)
} else {
(RecvState::Ack, None)
}
} else {
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(RecvState::Ack, Some(None))
}
}
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};
self.state = state;
Ok(next)
}
}
enum NotifyState {}
pub enum NotifyAction<'r, 'p> {
Send(&'r [u8]),
Notify(ProtoCtx<'r, 'p>),
}
pub struct NotifyCompletion<'r, 'a, 'p> {
// TODO
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_transport: &'r mut Transport<'a>,
_rx: &'r mut Packet<'p>,
_tx: &'r mut Packet<'p>,
_state: NotifyState,
}
impl<'r, 'a, 'p> NotifyCompletion<'r, 'a, 'p> {
pub fn next_action(&mut self) -> Result<Option<NotifyAction<'_, 'p>>, Error> {
loop {
// Polonius will remove the need for unsafe one day
let this = unsafe { (self as *mut NotifyCompletion).as_mut().unwrap() };
if let Some(action) = this.maybe_next_action()? {
return Ok(action);
}
}
}
fn maybe_next_action(&mut self) -> Result<Option<Option<NotifyAction<'_, 'p>>>, Error> {
Ok(Some(None)) // TODO: Future
}
}
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pub struct Transport<'a> {
matter: &'a Matter<'a>,
exch_mgr: exchange::ExchangeMgr,
}
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impl<'a> Transport<'a> {
#[inline(always)]
pub fn new(matter: &'a Matter<'a>) -> Self {
let epoch = matter.epoch;
let rand = matter.rand;
Self {
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matter,
exch_mgr: exchange::ExchangeMgr::new(epoch, rand),
}
}
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pub fn matter(&self) -> &Matter<'a> {
&self.matter
}
pub fn start(&mut self, dev_comm: CommissioningData, buf: &mut [u8]) -> Result<(), Error> {
info!("Starting Matter transport");
if self.matter().start_comissioning(dev_comm, buf)? {
info!("Comissioning started");
}
Ok(())
}
pub fn recv<'r, 'p>(
&'r mut self,
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addr: Address,
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rx_buf: &'p mut [u8],
tx_buf: &'p mut [u8],
) -> RecvCompletion<'r, 'a, 'p> {
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let mut rx = Packet::new_rx(rx_buf);
let tx = Packet::new_tx(tx_buf);
rx.peer = addr;
RecvCompletion {
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transport: self,
rx,
tx,
state: RecvState::New,
}
}
pub fn notify(&mut self, _tx: &mut Packet) -> Result<bool, Error> {
Ok(false)
}
}