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        } else if (action == evt->NlActionAddressUpdated ||
71                   action == evt->NlActionAddressRemoved) {
72            const char *address = evt->findParam("ADDRESS");
73            const char *flags = evt->findParam("FLAGS");
74            const char *scope = evt->findParam("SCOPE");
75            if (iface && flags && scope) {
76                notifyAddressChanged(action, address, iface, flags, scope);
77            }
78        }
79
80    } else if (!strcmp(subsys, "qlog")) {
81        const char *alertName = evt->findParam("ALERT_NAME");
82        const char *iface = evt->findParam("INTERFACE");
83        notifyQuotaLimitReached(alertName, iface);
84
85    } else if (!strcmp(subsys, "xt_idletimer")) {
86        int action = evt->getAction();
87        const char *label = evt->findParam("LABEL");
88        const char *state = evt->findParam("STATE");
89        // if no LABEL, use INTERFACE instead
90        if (label == NULL) {
91            label = evt->findParam("INTERFACE");
92        }
93        if (state)
94            notifyInterfaceClassActivity(label, !strcmp("active", state));
95
96#if !LOG_NDEBUG
97    } else if (strcmp(subsys, "platform") && strcmp(subsys, "backlight")) {
98        /* It is not a VSYNC or a backlight event */
99        ALOGV("unexpected event from subsystem %s", subsys);
100#endif
101    }
102}
103
104void NetlinkHandler::notifyInterfaceAdded(const char *name) {
105    char msg[255];
106    snprintf(msg, sizeof(msg), "Iface added %s", name);
107
108    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
109            msg, false);
110}
111
112void NetlinkHandler::notifyInterfaceRemoved(const char *name) {
113    char msg[255];
114    snprintf(msg, sizeof(msg), "Iface removed %s", name);
115
116    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
117            msg, false);
118}
119
120void NetlinkHandler::notifyInterfaceChanged(const char *name, bool isUp) {
121    char msg[255];
122    snprintf(msg, sizeof(msg), "Iface changed %s %s", name,
123             (isUp ? "up" : "down"));
124
125    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
126            msg, false);
127}
128
129void NetlinkHandler::notifyInterfaceLinkChanged(const char *name, bool isUp) {
130    char msg[255];
131    snprintf(msg, sizeof(msg), "Iface linkstate %s %s", name,
132             (isUp ? "up" : "down"));
133
134    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceChange,
135            msg, false);
136}
137
138void NetlinkHandler::notifyQuotaLimitReached(const char *name, const char *iface) {
139    char msg[255];
140    snprintf(msg, sizeof(msg), "limit alert %s %s", name, iface);
141
142    mNm->getBroadcaster()->sendBroadcast(ResponseCode::BandwidthControl,
143            msg, false);
144}
145
146void NetlinkHandler::notifyInterfaceClassActivity(const char *name,
147                                                  bool isActive) {
148    char msg[255];
149
150    snprintf(msg, sizeof(msg), "IfaceClass %s %s",
151             isActive ? "active" : "idle", name);
152    ALOGV("Broadcasting interface activity msg: %s", msg);
153    mNm->getBroadcaster()->sendBroadcast(
154        ResponseCode::InterfaceClassActivity, msg, false);
155}
156
157void NetlinkHandler::notifyAddressChanged(int action, const char *addr,
158                                          const char *iface, const char *flags,
159                                          const char *scope) {
160    char msg[255];
161    snprintf(msg, sizeof(msg), "Address %s %s %s %s %s",
162             (action == NetlinkEvent::NlActionAddressUpdated) ?
163             "updated" : "removed", addr, iface, flags, scope);
164
165    mNm->getBroadcaster()->sendBroadcast(ResponseCode::InterfaceAddressChange,
166            msg, false);
167}
168