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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 <dirent.h>
20 #include <errno.h>
21 #include <fcntl.h>
22 #include <inttypes.h>
23 #include <sys/stat.h>
24 #include <sys/types.h>
25 
26 #include "core_jni_helpers.h"
27 #include <jni.h>
28 #include <nativehelper/ScopedUtfChars.h>
29 #include <utils/misc.h>
30 #include <utils/Log.h>
31 
32 #include "android-base/unique_fd.h"
33 #include "bpf/BpfUtils.h"
34 #include "netdbpf/BpfNetworkStats.h"
35 
36 using android::bpf::Stats;
37 using android::bpf::bpfGetUidStats;
38 using android::bpf::bpfGetIfaceStats;
39 
40 namespace android {
41 
42 static const char* QTAGUID_IFACE_STATS = "/proc/net/xt_qtaguid/iface_stat_fmt";
43 static const char* QTAGUID_UID_STATS = "/proc/net/xt_qtaguid/stats";
44 
45 // NOTE: keep these in sync with TrafficStats.java
46 static const uint64_t UNKNOWN = -1;
47 
48 enum StatsType {
49     RX_BYTES = 0,
50     RX_PACKETS = 1,
51     TX_BYTES = 2,
52     TX_PACKETS = 3,
53     TCP_RX_PACKETS = 4,
54     TCP_TX_PACKETS = 5
55 };
56 
getStatsType(struct Stats * stats,StatsType type)57 static uint64_t getStatsType(struct Stats* stats, StatsType type) {
58     switch (type) {
59         case RX_BYTES:
60             return stats->rxBytes;
61         case RX_PACKETS:
62             return stats->rxPackets;
63         case TX_BYTES:
64             return stats->txBytes;
65         case TX_PACKETS:
66             return stats->txPackets;
67         case TCP_RX_PACKETS:
68             return stats->tcpRxPackets;
69         case TCP_TX_PACKETS:
70             return stats->tcpTxPackets;
71         default:
72             return UNKNOWN;
73     }
74 }
75 
parseIfaceStats(const char * iface,struct Stats * stats)76 static int parseIfaceStats(const char* iface, struct Stats* stats) {
77     FILE *fp = fopen(QTAGUID_IFACE_STATS, "r");
78     if (fp == NULL) {
79         return -1;
80     }
81 
82     char buffer[384];
83     char cur_iface[32];
84     bool foundTcp = false;
85     uint64_t rxBytes, rxPackets, txBytes, txPackets, tcpRxPackets, tcpTxPackets;
86 
87     while (fgets(buffer, sizeof(buffer), fp) != NULL) {
88         int matched = sscanf(buffer, "%31s %" SCNu64 " %" SCNu64 " %" SCNu64
89                 " %" SCNu64 " " "%*u %" SCNu64 " %*u %*u %*u %*u "
90                 "%*u %" SCNu64 " %*u %*u %*u %*u", cur_iface, &rxBytes,
91                 &rxPackets, &txBytes, &txPackets, &tcpRxPackets, &tcpTxPackets);
92         if (matched >= 5) {
93             if (matched == 7) {
94                 foundTcp = true;
95             }
96             if (!iface || !strcmp(iface, cur_iface)) {
97                 stats->rxBytes += rxBytes;
98                 stats->rxPackets += rxPackets;
99                 stats->txBytes += txBytes;
100                 stats->txPackets += txPackets;
101                 if (matched == 7) {
102                     stats->tcpRxPackets += tcpRxPackets;
103                     stats->tcpTxPackets += tcpTxPackets;
104                 }
105             }
106         }
107     }
108 
109     if (!foundTcp) {
110         stats->tcpRxPackets = UNKNOWN;
111         stats->tcpTxPackets = UNKNOWN;
112     }
113 
114     if (fclose(fp) != 0) {
115         return -1;
116     }
117     return 0;
118 }
119 
parseUidStats(const uint32_t uid,struct Stats * stats)120 static int parseUidStats(const uint32_t uid, struct Stats* stats) {
121     FILE *fp = fopen(QTAGUID_UID_STATS, "r");
122     if (fp == NULL) {
123         return -1;
124     }
125 
126     char buffer[384];
127     char iface[32];
128     uint32_t idx, cur_uid, set;
129     uint64_t tag, rxBytes, rxPackets, txBytes, txPackets;
130 
131     while (fgets(buffer, sizeof(buffer), fp) != NULL) {
132         if (sscanf(buffer,
133                 "%" SCNu32 " %31s 0x%" SCNx64 " %u %u %" SCNu64 " %" SCNu64
134                 " %" SCNu64 " %" SCNu64 "",
135                 &idx, iface, &tag, &cur_uid, &set, &rxBytes, &rxPackets,
136                 &txBytes, &txPackets) == 9) {
137             if (uid == cur_uid && tag == 0L) {
138                 stats->rxBytes += rxBytes;
139                 stats->rxPackets += rxPackets;
140                 stats->txBytes += txBytes;
141                 stats->txPackets += txPackets;
142             }
143         }
144     }
145 
146     if (fclose(fp) != 0) {
147         return -1;
148     }
149     return 0;
150 }
151 
getTotalStat(JNIEnv * env,jclass clazz,jint type,jboolean useBpfStats)152 static jlong getTotalStat(JNIEnv* env, jclass clazz, jint type, jboolean useBpfStats) {
153     struct Stats stats;
154     memset(&stats, 0, sizeof(Stats));
155 
156     if (useBpfStats) {
157         if (bpfGetIfaceStats(NULL, &stats) == 0) {
158             return getStatsType(&stats, (StatsType) type);
159         } else {
160             return UNKNOWN;
161         }
162     }
163 
164     if (parseIfaceStats(NULL, &stats) == 0) {
165         return getStatsType(&stats, (StatsType) type);
166     } else {
167         return UNKNOWN;
168     }
169 }
170 
getIfaceStat(JNIEnv * env,jclass clazz,jstring iface,jint type,jboolean useBpfStats)171 static jlong getIfaceStat(JNIEnv* env, jclass clazz, jstring iface, jint type,
172                           jboolean useBpfStats) {
173     ScopedUtfChars iface8(env, iface);
174     if (iface8.c_str() == NULL) {
175         return UNKNOWN;
176     }
177 
178     struct Stats stats;
179     memset(&stats, 0, sizeof(Stats));
180 
181     if (useBpfStats) {
182         if (bpfGetIfaceStats(iface8.c_str(), &stats) == 0) {
183             return getStatsType(&stats, (StatsType) type);
184         } else {
185             return UNKNOWN;
186         }
187     }
188 
189     if (parseIfaceStats(iface8.c_str(), &stats) == 0) {
190         return getStatsType(&stats, (StatsType) type);
191     } else {
192         return UNKNOWN;
193     }
194 }
195 
getUidStat(JNIEnv * env,jclass clazz,jint uid,jint type,jboolean useBpfStats)196 static jlong getUidStat(JNIEnv* env, jclass clazz, jint uid, jint type, jboolean useBpfStats) {
197     struct Stats stats;
198     memset(&stats, 0, sizeof(Stats));
199 
200     if (useBpfStats) {
201         if (bpfGetUidStats(uid, &stats) == 0) {
202             return getStatsType(&stats, (StatsType) type);
203         } else {
204             return UNKNOWN;
205         }
206     }
207 
208     if (parseUidStats(uid, &stats) == 0) {
209         return getStatsType(&stats, (StatsType) type);
210     } else {
211         return UNKNOWN;
212     }
213 }
214 
215 static const JNINativeMethod gMethods[] = {
216     {"nativeGetTotalStat", "(IZ)J", (void*) getTotalStat},
217     {"nativeGetIfaceStat", "(Ljava/lang/String;IZ)J", (void*) getIfaceStat},
218     {"nativeGetUidStat", "(IIZ)J", (void*) getUidStat},
219 };
220 
register_android_server_net_NetworkStatsService(JNIEnv * env)221 int register_android_server_net_NetworkStatsService(JNIEnv* env) {
222     jclass netStatsService = env->FindClass("com/android/server/net/NetworkStatsService");
223     jfieldID rxBytesId = env->GetStaticFieldID(netStatsService, "TYPE_RX_BYTES", "I");
224     jfieldID rxPacketsId = env->GetStaticFieldID(netStatsService, "TYPE_RX_PACKETS", "I");
225     jfieldID txBytesId = env->GetStaticFieldID(netStatsService, "TYPE_TX_BYTES", "I");
226     jfieldID txPacketsId = env->GetStaticFieldID(netStatsService, "TYPE_TX_PACKETS", "I");
227     jfieldID tcpRxPacketsId = env->GetStaticFieldID(netStatsService, "TYPE_TCP_RX_PACKETS", "I");
228     jfieldID tcpTxPacketsId = env->GetStaticFieldID(netStatsService, "TYPE_TCP_TX_PACKETS", "I");
229 
230     env->SetStaticIntField(netStatsService, rxBytesId, RX_BYTES);
231     env->SetStaticIntField(netStatsService, rxPacketsId, RX_PACKETS);
232     env->SetStaticIntField(netStatsService, txBytesId, TX_BYTES);
233     env->SetStaticIntField(netStatsService, txPacketsId, TX_PACKETS);
234     env->SetStaticIntField(netStatsService, tcpRxPacketsId, TCP_RX_PACKETS);
235     env->SetStaticIntField(netStatsService, tcpTxPacketsId, TCP_TX_PACKETS);
236 
237     return jniRegisterNativeMethods(env, "com/android/server/net/NetworkStatsService", gMethods,
238                                     NELEM(gMethods));
239 }
240 
241 }
242