NetlinkHandler.cpp revision 98f65d32b1530b4da6050e38d52f955710577efb 
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 *label = evt->findParam("LABEL");
80        const char *state = evt->findParam("STATE");
81        // if no LABEL, use INTERFACE instead
82        if (label == NULL) {
83            label = evt->findParam("INTERFACE");
84        }
85        if (state)
86            notifyInterfaceClassActivity(label, !strcmp("active", state));
87
88#if !LOG_NDEBUG
89    } else if (strcmp(subsys, "platform") && strcmp(subsys, "backlight")) {
90        /* It is not a VSYNC or a backlight event */
91        ALOGV("unexpected event from subsystem %s", subsys);
92#endif
93    }
94}
95
96void NetlinkHandler::notifyInterfaceAdded(const char *name) {
97    char msg[255];
98    snprintf(msg, sizeof(msg), "Iface added %s", name);
99
100    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
101            msg, false);
102}
103
104void NetlinkHandler::notifyInterfaceRemoved(const char *name) {
105    char msg[255];
106    snprintf(msg, sizeof(msg), "Iface removed %s", name);
107
108    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
109            msg, false);
110}
111
112void NetlinkHandler::notifyInterfaceChanged(const char *name, bool isUp) {
113    char msg[255];
114    snprintf(msg, sizeof(msg), "Iface changed %s %s", name,
115             (isUp ? "up" : "down"));
116
117    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
118            msg, false);
119}
120
121void NetlinkHandler::notifyInterfaceLinkChanged(const char *name, bool isUp) {
122    char msg[255];
123    snprintf(msg, sizeof(msg), "Iface linkstate %s %s", name,
124             (isUp ? "up" : "down"));
125
126    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
127            msg, false);
128}
129
130void NetlinkHandler::notifyQuotaLimitReached(const char *name, const char *iface) {
131    char msg[255];
132    snprintf(msg, sizeof(msg), "limit alert %s %s", name, iface);
133
134    mNm->getBroadcaster()->sendBroadcast(ResponseCode::BandwidthControl,
135            msg, false);
136}
137
138void NetlinkHandler::notifyInterfaceClassActivity(const char *name,
139                                                  bool isActive) {
140    char msg[255];
141
142    snprintf(msg, sizeof(msg), "Iface %s %s", name,
143             isActive ? "active" : "idle");
144    ALOGV("Broadcasting interface activity msg: %s", msg);
145    mNm->getBroadcaster()->sendBroadcast(
146            isActive ? ResponseCode::InterfaceClassActive
147                     : ResponseCode::InterfaceClassIdle,
148            msg, false);
149}
150