/* * Copyright (c) 2017, The Linux Foundation. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials provided * with the distribution. * * Neither the name of The Linux Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef _HAL_H_ #define _HAL_H_ /* HIDL Includes */ #include #include #include /* External Includes */ #include #include /* Internal Includes */ #include "CtUpdateAmbassador.h" #include "IOffloadManager.h" #include "IpaEventRelay.h" #include "LocalLogBuffer.h" /* Avoid the namespace litering everywhere */ using ::android::hardware::configureRpcThreadpool; using ::android::hardware::joinRpcThreadpool; using ::android::hardware::Return; using ::android::hardware::hidl_handle; using ::android::hardware::hidl_string; using ::android::hardware::hidl_vec; using RET = ::IOffloadManager::RET; using Prefix = ::IOffloadManager::Prefix; using ::std::map; using ::std::string; using ::std::vector; using ::android::hardware::tetheroffload::config::V1_0::IOffloadConfig; using ::android::hardware::tetheroffload::control::V1_0::IOffloadControl; using ::android::hardware::tetheroffload::control::V1_0::ITetheringOffloadCallback; class HAL : public IOffloadControl, IOffloadConfig { public: /* Static Const Definitions */ static const uint32_t UDP_SUBSCRIPTIONS = NF_NETLINK_CONNTRACK_NEW | NF_NETLINK_CONNTRACK_DESTROY; static const uint32_t TCP_SUBSCRIPTIONS = NF_NETLINK_CONNTRACK_UPDATE | NF_NETLINK_CONNTRACK_DESTROY; /* Interface to IPACM */ /** * @TODO This will likely need to be extended into a proper FactoryPattern * when version bumps are needed. * * This makeIPAHAL function would move to a HALFactory class. Each HAL could * then be versioned (class HAL_V1, class HAL_V2, etc) and inherit from a base class HAL. * Then the version number in this function could be used to decide which one to return * (if any). * * IPACM does not need to talk directly back to the returned HAL class. The other methods that * IPACM needs to call are covered by registering the event listeners. If IPACM did need to * talk directly back to the HAL object, without HAL registering a callback, these methods would * need to be defined in the HAL base class. * * This would slightly break backwards compatibility so it should be discouraged; however, the * base class could define a sane default implementation and not require that the child class * implement this new method. This "sane default implementation" might only be possible in the * case of listening to async events; if IPACM needs to query something, then this would not * be backwards compatible and should be done via registering a callback so that IPACM knows * this version of HAL supports that functionality. * * The above statements assume that only one version of the HAL will be instantiated at a time. * Yet, it seems possible that a HAL_V1 and HAL_V2 service could both be registered, extending * support to both old and new client implementations. It would be difficult to multiplex * information from both versions. Additionally, IPACM would be responsible for instantiating * two HALs (makeIPAHAL(1, ...); makeIPAHAL(2, ...)) which makes signaling between HAL versions * (see next paragraph) slightly more difficult but not impossible. * * If concurrent versions of HAL are required, there will likely need to only be one master. * Whichever version of HAL receives a client first may be allowed to take over control while * other versions would be required to return failures (ETRYAGAIN: another version in use) until * that version of the client relinquishes control. This should work seemlessly because we * currently have an assumption that only one client will be present in system image. * Logically, that client will have only a single version (or if it supports multiple, it will * always attempt the newest version of HAL before falling back) and therefore no version * collisions could possibly occur. * * Dislaimer: * ========== * Supporting multiple versions of an interface, in the same code base, at runtime, comes with a * significant carrying cost and overhead in the form of developer headaches. This should not * be done lightly and should be extensively scoped before committing to the effort. * * Perhaps the notion of minor version could be introduced to bridge the gaps created above. * For example, 1.x and 1.y could be ran concurrently and supported from the same IPACM code. * Yet, a major version update, would not be backwards compatible. This means that a 2.x HAL * could not linked into the same IPACM code base as a 1.x HAL. */ static HAL* makeIPAHAL(int /* version */, IOffloadManager* /* mgr */); /* IOffloadConfig */ Return setHandles( const hidl_handle& /* fd1 */, const hidl_handle& /* fd2 */, setHandles_cb /* hidl_cb */); /* IOffloadControl */ Return initOffload( const ::android::sp& /* cb */, initOffload_cb /* hidl_cb */); Return stopOffload( stopOffload_cb /* hidl_cb */); Return setLocalPrefixes( const hidl_vec& /* prefixes */, setLocalPrefixes_cb /* hidl_cb */); Return getForwardedStats( const hidl_string& /* upstream */, getForwardedStats_cb /* hidl_cb */); Return setDataLimit( const hidl_string& /* upstream */, uint64_t /* limit */, setDataLimit_cb /* hidl_cb */); Return setUpstreamParameters( const hidl_string& /* iface */, const hidl_string& /* v4Addr */, const hidl_string& /* v4Gw */, const hidl_vec& /* v6Gws */, setUpstreamParameters_cb /* hidl_cb */); Return addDownstream( const hidl_string& /* iface */, const hidl_string& /* prefix */, addDownstream_cb /* hidl_cb */); Return removeDownstream( const hidl_string& /* iface */, const hidl_string& /* prefix */, removeDownstream_cb /* hidl_cb */); private: typedef struct BoolResult { bool success; string errMsg; } boolResult_t; HAL(IOffloadManager* /* mgr */); void registerAsSystemService(const char* /* name */); void doLogcatDump(); static BoolResult makeInputCheckFailure(string /* customErr */); static BoolResult ipaResultToBoolResult(RET /* in */); static vector convertHidlStrToStdStr(hidl_vec /* in */); void registerEventListeners(); void registerIpaCb(); void registerCtCb(); void unregisterEventListeners(); void unregisterIpaCb(); void unregisterCtCb(); void clearHandles(); bool isInitialized(); IOffloadManager* mIPA; hidl_handle mHandle1; hidl_handle mHandle2; LocalLogBuffer mLogs; ::android::sp mCb; IpaEventRelay *mCbIpa; CtUpdateAmbassador *mCbCt; }; /* HAL */ #endif /* _HAL_H_ */