NetlinkHandler.cpp revision 40baed83f89e8d8f834cdfa94d0615076463c04b 
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 <stdlib.h>
19#include <string.h>
20#include <errno.h>
21
22#define LOG_TAG "Netd"
23
24#include <cutils/log.h>
25
26#include <sysutils/NetlinkEvent.h>
27#include "NetlinkHandler.h"
28#include "NetlinkManager.h"
29#include "ResponseCode.h"
30
31NetlinkHandler::NetlinkHandler(NetlinkManager *nm, int listenerSocket,
32                               int format) :
33                        NetlinkListener(listenerSocket, format) {
34    mNm = nm;
35}
36
37NetlinkHandler::~NetlinkHandler() {
38}
39
40int NetlinkHandler::start() {
41    return this->startListener();
42}
43
44int NetlinkHandler::stop() {
45    return this->stopListener();
46}
47
48void NetlinkHandler::onEvent(NetlinkEvent *evt) {
49    const char *subsys = evt->getSubsystem();
50    if (!subsys) {
51        ALOGW("No subsystem found in netlink event");
52        return;
53    }
54
55    if (!strcmp(subsys, "net")) {
56        int action = evt->getAction();
57        const char *iface = evt->findParam("INTERFACE");
58
59        if (action == evt->NlActionAdd) {
60            notifyInterfaceAdded(iface);
61        } else if (action == evt->NlActionRemove) {
62            notifyInterfaceRemoved(iface);
63        } else if (action == evt->NlActionChange) {
64            evt->dump();
65            notifyInterfaceChanged("nana", true);
66        } else if (action == evt->NlActionLinkUp) {
67            notifyInterfaceLinkChanged(iface, true);
68        } else if (action == evt->NlActionLinkDown) {
69            notifyInterfaceLinkChanged(iface, false);
70        }
71
72    } else if (!strcmp(subsys, "qlog")) {
73        const char *alertName = evt->findParam("ALERT_NAME");
74        const char *iface = evt->findParam("INTERFACE");
75        notifyQuotaLimitReached(alertName, iface);
76
77    } else if (!strcmp(subsys, "xt_idletimer")) {
78        int action = evt->getAction();
79        const char *iface = evt->findParam("INTERFACE");
80        const char *state = evt->findParam("STATE");
81        if (state)
82            notifyInterfaceActivity(iface, !strcmp("active", state));
83
84#if !LOG_NDEBUG
85    } else if (strcmp(subsys, "platform") && strcmp(subsys, "backlight")) {
86        /* It is not a VSYNC or a backlight event */
87        ALOGV("unexpected event from subsystem %s", subsys);
88#endif
89    }
90}
91
92void NetlinkHandler::notifyInterfaceAdded(const char *name) {
93    char msg[255];
94    snprintf(msg, sizeof(msg), "Iface added %s", name);
95
96    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
97            msg, false);
98}
99
100void NetlinkHandler::notifyInterfaceRemoved(const char *name) {
101    char msg[255];
102    snprintf(msg, sizeof(msg), "Iface removed %s", name);
103
104    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
105            msg, false);
106}
107
108void NetlinkHandler::notifyInterfaceChanged(const char *name, bool isUp) {
109    char msg[255];
110    snprintf(msg, sizeof(msg), "Iface changed %s %s", name,
111             (isUp ? "up" : "down"));
112
113    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
114            msg, false);
115}
116
117void NetlinkHandler::notifyInterfaceLinkChanged(const char *name, bool isUp) {
118    char msg[255];
119    snprintf(msg, sizeof(msg), "Iface linkstate %s %s", name,
120             (isUp ? "up" : "down"));
121
122    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
123            msg, false);
124}
125
126void NetlinkHandler::notifyQuotaLimitReached(const char *name, const char *iface) {
127    char msg[255];
128    snprintf(msg, sizeof(msg), "limit alert %s %s", name, iface);
129
130    mNm->getBroadcaster()->sendBroadcast(ResponseCode::BandwidthControl,
131            msg, false);
132}
133
134void NetlinkHandler::notifyInterfaceActivity(const char *name, bool isActive) {
135    char msg[255];
136
137    snprintf(msg, sizeof(msg), "Iface %s %s", name, isActive ? "active" : "idle");
138    ALOGV("Broadcasting interface activity msg: %s", msg);
139    mNm->getBroadcaster()->sendBroadcast(isActive ? ResponseCode::InterfaceActive
140            : ResponseCode::InterfaceIdle,
141            msg, false);
142}
143