| /* |
| * Copyright 2019 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #pragma once |
| |
| #include <memory> |
| #include <unordered_map> |
| #include <utility> |
| |
| #include "common/bidi_queue.h" |
| #include "l2cap/cid.h" |
| #include "l2cap/internal/channel_impl.h" |
| #include "l2cap/internal/data_controller.h" |
| #include "l2cap/internal/scheduler.h" |
| #include "l2cap/l2cap_packets.h" |
| #include "l2cap/mtu.h" |
| #include "os/handler.h" |
| #include "os/queue.h" |
| #include "packet/base_packet_builder.h" |
| #include "packet/packet_view.h" |
| #include "packet/raw_builder.h" |
| |
| namespace bluetooth { |
| namespace l2cap { |
| namespace internal { |
| class ILink; |
| |
| class ErtmController : public DataController { |
| public: |
| using UpperEnqueue = packet::PacketView<packet::kLittleEndian>; |
| using UpperDequeue = packet::BasePacketBuilder; |
| using UpperQueueDownEnd = common::BidiQueueEnd<UpperEnqueue, UpperDequeue>; |
| ErtmController(ILink* link, Cid cid, Cid remote_cid, UpperQueueDownEnd* channel_queue_end, os::Handler* handler, |
| Scheduler* scheduler); |
| ~ErtmController(); |
| // Segmentation is handled here |
| void OnSdu(std::unique_ptr<packet::BasePacketBuilder> sdu) override; |
| void OnPdu(packet::PacketView<true> pdu) override; |
| std::unique_ptr<packet::BasePacketBuilder> GetNextPacket() override; |
| void EnableFcs(bool enabled) override; |
| void SetRetransmissionAndFlowControlOptions(const RetransmissionAndFlowControlConfigurationOption& option) override; |
| |
| private: |
| ILink* link_; |
| Cid cid_; |
| Cid remote_cid_; |
| os::EnqueueBuffer<UpperEnqueue> enqueue_buffer_; |
| os::Handler* handler_; |
| std::queue<std::unique_ptr<packet::BasePacketBuilder>> pdu_queue_; |
| Scheduler* scheduler_; |
| |
| // Configuration options |
| bool fcs_enabled_ = false; |
| uint16_t local_tx_window_ = 10; |
| uint16_t local_max_transmit_ = 20; |
| uint16_t local_retransmit_timeout_ms_ = 2000; |
| uint16_t local_monitor_timeout_ms_ = 12000; |
| |
| uint16_t remote_tx_window_ = 10; |
| uint16_t remote_mps_ = 1010; |
| |
| uint16_t size_each_packet_ = |
| (remote_mps_ - 4 /* basic L2CAP header */ - 2 /* SDU length */ - 2 /* Extended control */ - 2 /* FCS */); |
| |
| class PacketViewForReassembly : public packet::PacketView<kLittleEndian> { |
| public: |
| PacketViewForReassembly(const PacketView& packetView) : PacketView(packetView) {} |
| void AppendPacketView(packet::PacketView<kLittleEndian> to_append) { |
| Append(to_append); |
| } |
| }; |
| |
| class CopyablePacketBuilder : public packet::BasePacketBuilder { |
| public: |
| CopyablePacketBuilder(std::shared_ptr<packet::RawBuilder> builder) : builder_(std::move(builder)) {} |
| |
| void Serialize(BitInserter& it) const override; |
| |
| size_t size() const override; |
| |
| private: |
| std::shared_ptr<packet::RawBuilder> builder_; |
| }; |
| |
| PacketViewForReassembly reassembly_stage_{std::make_shared<std::vector<uint8_t>>()}; |
| SegmentationAndReassembly sar_state_ = SegmentationAndReassembly::END; |
| uint16_t remaining_sdu_continuation_packet_size_ = 0; |
| |
| void stage_for_reassembly(SegmentationAndReassembly sar, uint16_t sdu_size, |
| const packet::PacketView<kLittleEndian>& payload); |
| void send_pdu(std::unique_ptr<packet::BasePacketBuilder> pdu); |
| |
| void close_channel(); |
| |
| void on_pdu_no_fcs(const packet::PacketView<true>& pdu); |
| void on_pdu_fcs(const packet::PacketView<true>& pdu); |
| |
| struct impl; |
| std::unique_ptr<impl> pimpl_; |
| }; |
| |
| } // namespace internal |
| } // namespace l2cap |
| } // namespace bluetooth |