1 /*
2 * Copyright (C) 2010 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 #define LOG_TAG "NetworkStatsNative"
18
19 #include <cutils/qtaguid.h>
20 #include <dirent.h>
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <inttypes.h>
24 #include <jni.h>
25 #include <nativehelper/ScopedUtfChars.h>
26 #include <sys/stat.h>
27 #include <sys/types.h>
28 #include <utils/Log.h>
29 #include <utils/misc.h>
30
31 #include "bpf/BpfUtils.h"
32 #include "netdbpf/BpfNetworkStats.h"
33 #include "netdbpf/NetworkTraceHandler.h"
34
35 using android::bpf::bpfGetUidStats;
36 using android::bpf::bpfGetIfaceStats;
37 using android::bpf::bpfRegisterIface;
38 using android::bpf::NetworkTraceHandler;
39
40 namespace android {
41
nativeRegisterIface(JNIEnv * env,jclass clazz,jstring iface)42 static void nativeRegisterIface(JNIEnv* env, jclass clazz, jstring iface) {
43 ScopedUtfChars iface8(env, iface);
44 if (iface8.c_str() == nullptr) return;
45 bpfRegisterIface(iface8.c_str());
46 }
47
statsValueToEntry(JNIEnv * env,StatsValue * stats)48 static jobject statsValueToEntry(JNIEnv* env, StatsValue* stats) {
49 // Find the Java class that represents the structure
50 jclass gEntryClass = env->FindClass("android/net/NetworkStats$Entry");
51 if (gEntryClass == nullptr) {
52 return nullptr;
53 }
54
55 // Find the constructor.
56 jmethodID constructorID = env->GetMethodID(gEntryClass, "<init>", "()V");
57 if (constructorID == nullptr) {
58 return nullptr;
59 }
60
61 // Create a new instance of the Java class
62 jobject result = env->NewObject(gEntryClass, constructorID);
63 if (result == nullptr) {
64 return nullptr;
65 }
66
67 // Set the values of the structure fields in the Java object
68 env->SetLongField(result, env->GetFieldID(gEntryClass, "rxBytes", "J"), stats->rxBytes);
69 env->SetLongField(result, env->GetFieldID(gEntryClass, "txBytes", "J"), stats->txBytes);
70 env->SetLongField(result, env->GetFieldID(gEntryClass, "rxPackets", "J"), stats->rxPackets);
71 env->SetLongField(result, env->GetFieldID(gEntryClass, "txPackets", "J"), stats->txPackets);
72
73 return result;
74 }
75
nativeGetTotalStat(JNIEnv * env,jclass clazz)76 static jobject nativeGetTotalStat(JNIEnv* env, jclass clazz) {
77 StatsValue stats = {};
78
79 if (bpfGetIfaceStats(nullptr, &stats) == 0) {
80 return statsValueToEntry(env, &stats);
81 } else {
82 return nullptr;
83 }
84 }
85
nativeGetIfaceStat(JNIEnv * env,jclass clazz,jstring iface)86 static jobject nativeGetIfaceStat(JNIEnv* env, jclass clazz, jstring iface) {
87 ScopedUtfChars iface8(env, iface);
88 if (iface8.c_str() == nullptr) {
89 return nullptr;
90 }
91
92 StatsValue stats = {};
93
94 if (bpfGetIfaceStats(iface8.c_str(), &stats) == 0) {
95 return statsValueToEntry(env, &stats);
96 } else {
97 return nullptr;
98 }
99 }
100
nativeGetUidStat(JNIEnv * env,jclass clazz,jint uid)101 static jobject nativeGetUidStat(JNIEnv* env, jclass clazz, jint uid) {
102 StatsValue stats = {};
103
104 if (bpfGetUidStats(uid, &stats) == 0) {
105 return statsValueToEntry(env, &stats);
106 } else {
107 return nullptr;
108 }
109 }
110
nativeInitNetworkTracing(JNIEnv * env,jclass clazz)111 static void nativeInitNetworkTracing(JNIEnv* env, jclass clazz) {
112 NetworkTraceHandler::InitPerfettoTracing();
113 }
114
115 static const JNINativeMethod gMethods[] = {
116 {
117 "nativeRegisterIface",
118 "(Ljava/lang/String;)V",
119 (void*)nativeRegisterIface
120 },
121 {
122 "nativeGetTotalStat",
123 "()Landroid/net/NetworkStats$Entry;",
124 (void*)nativeGetTotalStat
125 },
126 {
127 "nativeGetIfaceStat",
128 "(Ljava/lang/String;)Landroid/net/NetworkStats$Entry;",
129 (void*)nativeGetIfaceStat
130 },
131 {
132 "nativeGetUidStat",
133 "(I)Landroid/net/NetworkStats$Entry;",
134 (void*)nativeGetUidStat
135 },
136 {
137 "nativeInitNetworkTracing",
138 "()V",
139 (void*)nativeInitNetworkTracing
140 },
141 };
142
register_android_server_net_NetworkStatsService(JNIEnv * env)143 int register_android_server_net_NetworkStatsService(JNIEnv* env) {
144 return jniRegisterNativeMethods(env,
145 "android/net/connectivity/com/android/server/net/NetworkStatsService", gMethods,
146 NELEM(gMethods));
147 }
148
149 }
150