1 /* 2 * Copyright (C) 2008 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 #include <errno.h> 18 #include <stdio.h> 19 #include <string.h> 20 21 #include <sys/select.h> 22 #include <sys/socket.h> 23 #include <sys/time.h> 24 #include <sys/types.h> 25 #include <sys/un.h> 26 27 #include <linux/netlink.h> 28 29 #include <android-base/logging.h> 30 31 #include "NetlinkHandler.h" 32 #include "NetlinkManager.h" 33 34 NetlinkManager* NetlinkManager::sInstance = NULL; 35 Instance()36 NetlinkManager* NetlinkManager::Instance() { 37 if (!sInstance) sInstance = new NetlinkManager(); 38 return sInstance; 39 } 40 NetlinkManager()41 NetlinkManager::NetlinkManager() { 42 mBroadcaster = NULL; 43 } 44 ~NetlinkManager()45 NetlinkManager::~NetlinkManager() {} 46 start()47 int NetlinkManager::start() { 48 struct sockaddr_nl nladdr; 49 int sz = 64 * 1024; 50 int on = 1; 51 52 memset(&nladdr, 0, sizeof(nladdr)); 53 nladdr.nl_family = AF_NETLINK; 54 nladdr.nl_pid = getpid(); 55 nladdr.nl_groups = 0xffffffff; 56 57 if ((mSock = socket(PF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_KOBJECT_UEVENT)) < 0) { 58 PLOG(ERROR) << "Unable to create uevent socket"; 59 return -1; 60 } 61 62 // When running in a net/user namespace, SO_RCVBUFFORCE will fail because 63 // it will check for the CAP_NET_ADMIN capability in the root namespace. 64 // Try using SO_RCVBUF if that fails. 65 if ((setsockopt(mSock, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz)) < 0) && 66 (setsockopt(mSock, SOL_SOCKET, SO_RCVBUF, &sz, sizeof(sz)) < 0)) { 67 PLOG(ERROR) << "Unable to set uevent socket SO_RCVBUF/SO_RCVBUFFORCE option"; 68 goto out; 69 } 70 71 if (setsockopt(mSock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) { 72 PLOG(ERROR) << "Unable to set uevent socket SO_PASSCRED option"; 73 goto out; 74 } 75 76 if (bind(mSock, (struct sockaddr*)&nladdr, sizeof(nladdr)) < 0) { 77 PLOG(ERROR) << "Unable to bind uevent socket"; 78 goto out; 79 } 80 81 mHandler = new NetlinkHandler(mSock); 82 if (mHandler->start()) { 83 PLOG(ERROR) << "Unable to start NetlinkHandler"; 84 goto out; 85 } 86 87 return 0; 88 89 out: 90 close(mSock); 91 return -1; 92 } 93