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 "result.h" 20 21 #include <netlink/netlink.h> 22 23 #include <type_traits> 24 25 class NetlinkMessage { 26 public: 27 NetlinkMessage(); 28 NetlinkMessage(NetlinkMessage&& other); 29 ~NetlinkMessage(); 30 31 NetlinkMessage& operator=(NetlinkMessage&& other); 32 33 bool initGeneric(int family, uint8_t command, int version); 34 35 template<typename T, 36 typename = typename std::enable_if<!std::is_pointer<T>::value>::type> addAttribute(int attribute,const T & value)37 bool addAttribute(int attribute, const T& value) { 38 return nla_put(mMessage, attribute, sizeof(T), &value) == 0; 39 } 40 template<typename T, 41 typename = typename std::enable_if<std::is_pointer<T>::value>::type> addAttribute(int attribute,T data,size_t numElements)42 bool addAttribute(int attribute, T data, size_t numElements) { 43 return nla_put(mMessage, 44 attribute, 45 sizeof(*data) * numElements, 46 data) == 0; 47 } 48 49 uint32_t getSeqNum() const; 50 get()51 struct nl_msg* get() { return mMessage; } 52 53 private: 54 NetlinkMessage(const NetlinkMessage&) = delete; 55 NetlinkMessage& operator=(const NetlinkMessage&) = delete; 56 57 struct nl_msg* mMessage = nullptr; 58 }; 59 60