NetlinkManager.cpp revision 564df4efc87f3d04c3570836d38134fd949c4caf 
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    int on = 1;
57
58    memset(&nladdr, 0, sizeof(nladdr));
59    nladdr.nl_family = AF_NETLINK;
60    nladdr.nl_pid = getpid();
61    nladdr.nl_groups = groups;
62
63    if ((*sock = socket(PF_NETLINK, SOCK_DGRAM, socketType)) < 0) {
64        LOGE("Unable to create netlink socket: %s", strerror(errno));
65        return NULL;
66    }
67
68    if (setsockopt(*sock, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz)) < 0) {
69        LOGE("Unable to set uevent socket SO_RCVBUFFORCE option: %s", strerror(errno));
70        close(*sock);
71        return NULL;
72    }
73
74    if (setsockopt(*sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on)) < 0) {
75        SLOGE("Unable to set uevent socket SO_PASSCRED option: %s", strerror(errno));
76        close(*sock);
77        return NULL;
78    }
79
80    if (bind(*sock, (struct sockaddr *) &nladdr, sizeof(nladdr)) < 0) {
81        LOGE("Unable to bind netlink socket: %s", strerror(errno));
82        close(*sock);
83        return NULL;
84    }
85
86    NetlinkHandler *handler = new NetlinkHandler(this, *sock, format);
87    if (handler->start()) {
88        LOGE("Unable to start NetlinkHandler: %s", strerror(errno));
89        close(*sock);
90        return NULL;
91    }
92
93    return handler;
94}
95
96int NetlinkManager::start() {
97    if ((mUeventHandler = setupSocket(&mUeventSock, NETLINK_KOBJECT_UEVENT,
98         0xffffffff, NetlinkListener::NETLINK_FORMAT_ASCII)) == NULL) {
99        return -1;
100    }
101
102    if ((mRouteHandler = setupSocket(&mRouteSock, NETLINK_ROUTE, RTMGRP_LINK,
103         NetlinkListener::NETLINK_FORMAT_BINARY)) == NULL) {
104        return -1;
105    }
106    return 0;
107}
108
109int NetlinkManager::stop() {
110    int status = 0;
111
112    if (mUeventHandler->stop()) {
113        LOGE("Unable to stop uevent NetlinkHandler: %s", strerror(errno));
114        status = -1;
115    }
116
117    delete mUeventHandler;
118    mUeventHandler = NULL;
119
120    close(mUeventSock);
121    mUeventSock = -1;
122
123    if (mRouteHandler->stop()) {
124        LOGE("Unable to stop route NetlinkHandler: %s", strerror(errno));
125        status = -1;
126    }
127
128    delete mRouteHandler;
129    mRouteHandler = NULL;
130
131    close(mRouteSock);
132    mRouteSock = -1;
133
134    return status;
135}
136