NetlinkManager.cpp revision f6a7ad814dca2f67907eaed2cc0609c684850969 
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 <stdio.h>
18#include <errno.h>
19
20#include <sys/socket.h>
21#include <sys/select.h>
22#include <sys/time.h>
23#include <sys/types.h>
24#include <sys/un.h>
25
26#include <linux/netlink.h>
27#include <linux/rtnetlink.h>
28
29#define LOG_TAG "Netd"
30
31#include <cutils/log.h>
32
33#include "NetlinkManager.h"
34#include "NetlinkHandler.h"
35
36NetlinkManager *NetlinkManager::sInstance = NULL;
37
38NetlinkManager *NetlinkManager::Instance() {
39    if (!sInstance)
40        sInstance = new NetlinkManager();
41    return sInstance;
42}
43
44NetlinkManager::NetlinkManager() {
45    mBroadcaster = NULL;
46}
47
48NetlinkManager::~NetlinkManager() {
49}
50
51NetlinkHandler *NetlinkManager::setupSocket(int *sock, int socketType,
52    int groups, int format) {
53
54    struct sockaddr_nl nladdr;
55    int sz = 64 * 1024;
56
57    memset(&nladdr, 0, sizeof(nladdr));
58    nladdr.nl_family = AF_NETLINK;
59    nladdr.nl_pid = getpid();
60    nladdr.nl_groups = groups;
61
62    if ((*sock = socket(PF_NETLINK, SOCK_DGRAM, socketType)) < 0) {
63        LOGE("Unable to create netlink socket: %s", strerror(errno));
64        return NULL;
65    }
66
67    if (setsockopt(*sock, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz)) < 0) {
68        LOGE("Unable to set netlink socket options: %s", strerror(errno));
69        close(*sock);
70        return NULL;
71    }
72
73    if (bind(*sock, (struct sockaddr *) &nladdr, sizeof(nladdr)) < 0) {
74        LOGE("Unable to bind netlink socket: %s", strerror(errno));
75        close(*sock);
76        return NULL;
77    }
78
79    NetlinkHandler *handler = new NetlinkHandler(this, *sock, format);
80    if (handler->start()) {
81        LOGE("Unable to start NetlinkHandler: %s", strerror(errno));
82        close(*sock);
83        return NULL;
84    }
85
86    return handler;
87}
88
89int NetlinkManager::start() {
90    if ((mUeventHandler = setupSocket(&mUeventSock, NETLINK_KOBJECT_UEVENT,
91         0xffffffff, NetlinkListener::NETLINK_FORMAT_ASCII)) == NULL) {
92        return -1;
93    }
94
95    if ((mRouteHandler = setupSocket(&mRouteSock, NETLINK_ROUTE, RTMGRP_LINK,
96         NetlinkListener::NETLINK_FORMAT_BINARY)) == NULL) {
97        return -1;
98    }
99    return 0;
100}
101
102int NetlinkManager::stop() {
103    int status = 0;
104
105    if (mUeventHandler->stop()) {
106        LOGE("Unable to stop uevent NetlinkHandler: %s", strerror(errno));
107        status = -1;
108    }
109
110    delete mUeventHandler;
111    mUeventHandler = NULL;
112
113    close(mUeventSock);
114    mUeventSock = -1;
115
116    if (mRouteHandler->stop()) {
117        LOGE("Unable to stop route NetlinkHandler: %s", strerror(errno));
118        status = -1;
119    }
120
121    delete mRouteHandler;
122    mRouteHandler = NULL;
123
124    close(mRouteSock);
125    mRouteSock = -1;
126
127    return status;
128}
129