1 /* 2 * Copyright 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <chrono> 20 #include <memory> 21 22 #include "hci/acl_manager.h" 23 #include "l2cap/internal/data_pipeline_manager.h" 24 #include "l2cap/internal/dynamic_channel_allocator.h" 25 #include "l2cap/internal/fixed_channel_allocator.h" 26 #include "l2cap/internal/ilink.h" 27 #include "l2cap/internal/parameter_provider.h" 28 #include "l2cap/le/dynamic_channel_manager.h" 29 #include "l2cap/le/internal/dynamic_channel_service_manager_impl.h" 30 #include "l2cap/le/internal/fixed_channel_impl.h" 31 #include "l2cap/le/internal/fixed_channel_service_manager_impl.h" 32 #include "l2cap/le/internal/signalling_manager.h" 33 #include "os/alarm.h" 34 35 namespace bluetooth { 36 namespace l2cap { 37 namespace le { 38 namespace internal { 39 40 class Link : public l2cap::internal::ILink { 41 public: 42 Link(os::Handler* l2cap_handler, std::unique_ptr<hci::AclConnection> acl_connection, 43 l2cap::internal::ParameterProvider* parameter_provider, 44 DynamicChannelServiceManagerImpl* dynamic_service_manager, 45 FixedChannelServiceManagerImpl* fixed_service_manager); 46 47 ~Link() override = default; 48 GetDevice()49 inline hci::AddressWithType GetDevice() override { 50 return {acl_connection_->GetAddress(), acl_connection_->GetAddressType()}; 51 } 52 53 struct PendingDynamicChannelConnection { 54 os::Handler* handler_; 55 DynamicChannelManager::OnConnectionOpenCallback on_open_callback_; 56 DynamicChannelManager::OnConnectionFailureCallback on_fail_callback_; 57 le::DynamicChannelConfigurationOption configuration_; 58 }; 59 GetRole()60 inline virtual hci::Role GetRole() { 61 return acl_connection_->GetRole(); 62 } 63 GetAclConnection()64 inline virtual hci::AclConnection* GetAclConnection() { 65 return acl_connection_.get(); 66 } 67 68 // ACL methods 69 70 virtual void OnAclDisconnected(hci::ErrorCode status); 71 72 virtual void Disconnect(); 73 74 // Handles connection parameter update request from remote 75 virtual void UpdateConnectionParameter(SignalId signal_id, uint16_t conn_interval_min, uint16_t conn_interval_max, 76 uint16_t conn_latency, uint16_t supervision_timeout); 77 78 // FixedChannel methods 79 80 virtual std::shared_ptr<FixedChannelImpl> AllocateFixedChannel(Cid cid, SecurityPolicy security_policy); 81 82 virtual bool IsFixedChannelAllocated(Cid cid); 83 84 // DynamicChannel methods 85 86 virtual Cid ReserveDynamicChannel(); 87 88 virtual void SendConnectionRequest(Psm psm, PendingDynamicChannelConnection pending_dynamic_channel_connection); 89 90 void SendDisconnectionRequest(Cid local_cid, Cid remote_cid) override; 91 92 // Invoked by signalling manager to indicate an outgoing connection request failed and link shall free resources 93 virtual void OnOutgoingConnectionRequestFail(Cid local_cid); 94 95 virtual std::shared_ptr<l2cap::internal::DynamicChannelImpl> AllocateDynamicChannel(Psm psm, Cid remote_cid, 96 SecurityPolicy security_policy); 97 98 virtual std::shared_ptr<l2cap::internal::DynamicChannelImpl> AllocateReservedDynamicChannel( 99 Cid reserved_cid, Psm psm, Cid remote_cid, SecurityPolicy security_policy); 100 101 virtual DynamicChannelConfigurationOption GetConfigurationForInitialConfiguration(Cid cid); 102 103 virtual void FreeDynamicChannel(Cid cid); 104 105 // Check how many channels are acquired or in use, if zero, start tear down timer, if non-zero, cancel tear down timer 106 virtual void RefreshRefCount(); 107 108 void NotifyChannelCreation(Cid cid, std::unique_ptr<DynamicChannel> user_channel); 109 void NotifyChannelFail(Cid cid); 110 ToString()111 virtual std::string ToString() { 112 return GetDevice().ToString(); 113 } 114 115 virtual uint16_t GetMps() const; 116 117 virtual uint16_t GetInitialCredit() const; 118 119 void SendLeCredit(Cid local_cid, uint16_t credit) override; 120 121 private: 122 os::Handler* l2cap_handler_; 123 l2cap::internal::FixedChannelAllocator<FixedChannelImpl, Link> fixed_channel_allocator_{this, l2cap_handler_}; 124 l2cap::internal::DynamicChannelAllocator dynamic_channel_allocator_{this, l2cap_handler_}; 125 std::unique_ptr<hci::AclConnection> acl_connection_; 126 l2cap::internal::DataPipelineManager data_pipeline_manager_; 127 l2cap::internal::ParameterProvider* parameter_provider_; 128 DynamicChannelServiceManagerImpl* dynamic_service_manager_; 129 LeSignallingManager signalling_manager_; 130 std::unordered_map<Cid, PendingDynamicChannelConnection> local_cid_to_pending_dynamic_channel_connection_map_; 131 os::Alarm link_idle_disconnect_alarm_{l2cap_handler_}; 132 DISALLOW_COPY_AND_ASSIGN(Link); 133 134 void on_connection_update_complete(SignalId signal_id, hci::ErrorCode error_code); 135 }; 136 137 } // namespace internal 138 } // namespace le 139 } // namespace l2cap 140 } // namespace bluetooth 141