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/*
* 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.
*/
#include <memory>
#include <unordered_map>
#include "hci/acl_manager/le_acl_connection.h"
#include "hci/address.h"
#include "l2cap/internal/scheduler_fifo.h"
#include "l2cap/le/internal/link.h"
#include "os/handler.h"
#include "os/log.h"
#include "l2cap/le/internal/link_manager.h"
namespace bluetooth {
namespace l2cap {
namespace le {
namespace internal {
void LinkManager::ConnectFixedChannelServices(hci::AddressWithType address_with_type,
PendingFixedChannelConnection pending_fixed_channel_connection) {
// Check if there is any service registered
auto fixed_channel_services = fixed_channel_service_manager_->GetRegisteredServices();
if (fixed_channel_services.empty()) {
// If so, return error
pending_fixed_channel_connection.handler_->Post(common::BindOnce(
std::move(pending_fixed_channel_connection.on_fail_callback_),
FixedChannelManager::ConnectionResult{
.connection_result_code = FixedChannelManager::ConnectionResultCode::FAIL_NO_SERVICE_REGISTERED}));
return;
}
// Otherwise, check if device has an ACL connection
auto* link = GetLink(address_with_type);
if (link != nullptr) {
// If device already have an ACL connection
// Check if all registered services have an allocated channel and allocate one if not already allocated
int num_new_channels = 0;
for (auto& fixed_channel_service : fixed_channel_services) {
if (link->IsFixedChannelAllocated(fixed_channel_service.first)) {
// This channel is already allocated for this link, do not allocated twice
continue;
}
// Allocate channel for newly registered fixed channels
auto fixed_channel_impl = link->AllocateFixedChannel(
fixed_channel_service.first, SecurityPolicy::NO_SECURITY_WHATSOEVER_PLAINTEXT_TRANSPORT_OK);
fixed_channel_service.second->NotifyChannelCreation(
std::make_unique<FixedChannel>(fixed_channel_impl, l2cap_handler_));
num_new_channels++;
}
// Declare connection failure if no new channels are created
if (num_new_channels == 0) {
pending_fixed_channel_connection.handler_->Post(common::BindOnce(
std::move(pending_fixed_channel_connection.on_fail_callback_),
FixedChannelManager::ConnectionResult{
.connection_result_code = FixedChannelManager::ConnectionResultCode::FAIL_ALL_SERVICES_HAVE_CHANNEL}));
}
// No need to create ACL connection, return without saving any pending connections
return;
}
// If not, create new ACL connection
// Add request to pending link list first
auto pending_link = pending_links_.find(address_with_type);
if (pending_link == pending_links_.end()) {
// Create pending link if not exist
pending_links_.try_emplace(address_with_type);
pending_link = pending_links_.find(address_with_type);
}
pending_link->second.pending_fixed_channel_connections_.push_back(std::move(pending_fixed_channel_connection));
// Then create new ACL connection
acl_manager_->CreateLeConnection(address_with_type, /* is_direct */ true);
}
void LinkManager::ConnectDynamicChannelServices(
hci::AddressWithType device, Link::PendingDynamicChannelConnection pending_dynamic_channel_connection, Psm psm) {
auto* link = GetLink(device);
if (link == nullptr) {
acl_manager_->CreateLeConnection(device, /* is_direct */ true);
pending_dynamic_channels_[device].push_back(std::make_pair(psm, std::move(pending_dynamic_channel_connection)));
return;
}
link->SendConnectionRequest(psm, std::move(pending_dynamic_channel_connection));
}
Link* LinkManager::GetLink(hci::AddressWithType address_with_type) {
if (links_.find(address_with_type) == links_.end()) {
return nullptr;
}
return &links_.find(address_with_type)->second;
}
void LinkManager::OnLeConnectSuccess(hci::AddressWithType connecting_address_with_type,
std::unique_ptr<hci::acl_manager::LeAclConnection> acl_connection) {
// Same link should not be connected twice
hci::AddressWithType connected_address_with_type = acl_connection->GetRemoteAddress();
uint16_t handle = acl_connection->GetHandle();
ASSERT_LOG(GetLink(connected_address_with_type) == nullptr, "%s is connected twice without disconnection",
acl_connection->GetRemoteAddress().ToString().c_str());
links_.try_emplace(connected_address_with_type, l2cap_handler_, std::move(acl_connection), parameter_provider_,
dynamic_channel_service_manager_, fixed_channel_service_manager_, this);
auto* link = GetLink(connected_address_with_type);
if (link_property_callback_handler_ != nullptr) {
link_property_callback_handler_->CallOn(
link_property_listener_,
&LinkPropertyListener::OnLinkConnected,
connected_address_with_type,
handle,
link->GetRole());
}
// Remove device from pending links list, if any
pending_links_.erase(connecting_address_with_type);
link->ReadRemoteVersionInformation();
}
void LinkManager::OnLeConnectFail(hci::AddressWithType address_with_type, hci::ErrorCode reason) {
// Notify all pending links for this device
auto pending_link = pending_links_.find(address_with_type);
if (pending_link == pending_links_.end()) {
// There is no pending link, exit
LOG_INFO("Connection to %s failed without a pending link", address_with_type.ToString().c_str());
return;
}
for (auto& pending_fixed_channel_connection : pending_link->second.pending_fixed_channel_connections_) {
pending_fixed_channel_connection.handler_->Post(common::BindOnce(
std::move(pending_fixed_channel_connection.on_fail_callback_),
FixedChannelManager::ConnectionResult{
.connection_result_code = FixedChannelManager::ConnectionResultCode::FAIL_HCI_ERROR, .hci_error = reason}));
}
// Remove entry in pending link list
pending_links_.erase(pending_link);
}
void LinkManager::OnDisconnect(bluetooth::hci::AddressWithType address_with_type) {
auto* link = GetLink(address_with_type);
ASSERT_LOG(link != nullptr, "Device %s is disconnected but not in local database",
address_with_type.ToString().c_str());
if (links_with_pending_packets_.count(address_with_type) != 0) {
disconnected_links_.emplace(address_with_type);
} else {
links_.erase(address_with_type);
}
if (link_property_callback_handler_ != nullptr) {
link_property_callback_handler_->CallOn(
link_property_listener_, &LinkPropertyListener::OnLinkDisconnected, address_with_type);
}
}
void LinkManager::RegisterLinkPropertyListener(os::Handler* handler, LinkPropertyListener* listener) {
link_property_callback_handler_ = handler;
link_property_listener_ = listener;
}
void LinkManager::OnReadRemoteVersionInformationComplete(
hci::ErrorCode hci_status,
hci::AddressWithType address_with_type,
uint8_t lmp_version,
uint16_t manufacturer_name,
uint16_t sub_version) {
if (link_property_callback_handler_ != nullptr) {
link_property_callback_handler_->CallOn(
link_property_listener_,
&LinkPropertyListener::OnReadRemoteVersionInformation,
hci_status,
address_with_type,
lmp_version,
manufacturer_name,
sub_version);
}
auto* link = GetLink(address_with_type);
// Allocate and distribute channels for all registered fixed channel services
auto fixed_channel_services = fixed_channel_service_manager_->GetRegisteredServices();
for (auto& fixed_channel_service : fixed_channel_services) {
auto fixed_channel_impl = link->AllocateFixedChannel(
fixed_channel_service.first, SecurityPolicy::NO_SECURITY_WHATSOEVER_PLAINTEXT_TRANSPORT_OK);
fixed_channel_service.second->NotifyChannelCreation(
std::make_unique<FixedChannel>(fixed_channel_impl, l2cap_handler_));
}
if (pending_dynamic_channels_.find(address_with_type) != pending_dynamic_channels_.end()) {
for (auto& psm_callback : pending_dynamic_channels_[address_with_type]) {
link->SendConnectionRequest(psm_callback.first, std::move(psm_callback.second));
}
pending_dynamic_channels_.erase(address_with_type);
}
}
void LinkManager::OnPendingPacketChange(hci::AddressWithType remote, int num_packets) {
if (disconnected_links_.count(remote) != 0 && num_packets == 0) {
links_.erase(remote);
links_with_pending_packets_.erase(remote);
} else if (num_packets != 0) {
links_with_pending_packets_.emplace(remote);
} else {
links_with_pending_packets_.erase(remote);
}
}
} // namespace internal
} // namespace le
} // namespace l2cap
} // namespace bluetooth
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