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/BpfNetworkStats.h"
34#include "bpf/BpfUtils.h"
35
36using android::bpf::Stats;
37using android::bpf::hasBpfSupport;
38using android::bpf::bpfGetUidStats;
39using android::bpf::bpfGetIfaceStats;
40
41namespace android {
42
43static const char* QTAGUID_IFACE_STATS = "/proc/net/xt_qtaguid/iface_stat_fmt";
44static const char* QTAGUID_UID_STATS = "/proc/net/xt_qtaguid/stats";
45
46// NOTE: keep these in sync with TrafficStats.java
47static const uint64_t UNKNOWN = -1;
48
49enum StatsType {
50    RX_BYTES = 0,
51    RX_PACKETS = 1,
52    TX_BYTES = 2,
53    TX_PACKETS = 3,
54    TCP_RX_PACKETS = 4,
55    TCP_TX_PACKETS = 5
56};
57
58static uint64_t getStatsType(struct Stats* stats, StatsType type) {
59    switch (type) {
60        case RX_BYTES:
61            return stats->rxBytes;
62        case RX_PACKETS:
63            return stats->rxPackets;
64        case TX_BYTES:
65            return stats->txBytes;
66        case TX_PACKETS:
67            return stats->txPackets;
68        case TCP_RX_PACKETS:
69            return stats->tcpRxPackets;
70        case TCP_TX_PACKETS:
71            return stats->tcpTxPackets;
72        default:
73            return UNKNOWN;
74    }
75}
76
77static int parseIfaceStats(const char* iface, struct Stats* stats) {
78    FILE *fp = fopen(QTAGUID_IFACE_STATS, "r");
79    if (fp == NULL) {
80        return -1;
81    }
82
83    char buffer[384];
84    char cur_iface[32];
85    bool foundTcp = false;
86    uint64_t rxBytes, rxPackets, txBytes, txPackets, tcpRxPackets, tcpTxPackets;
87
88    while (fgets(buffer, sizeof(buffer), fp) != NULL) {
89        int matched = sscanf(buffer, "%31s %" SCNu64 " %" SCNu64 " %" SCNu64
90                " %" SCNu64 " " "%*u %" SCNu64 " %*u %*u %*u %*u "
91                "%*u %" SCNu64 " %*u %*u %*u %*u", cur_iface, &rxBytes,
92                &rxPackets, &txBytes, &txPackets, &tcpRxPackets, &tcpTxPackets);
93        if (matched >= 5) {
94            if (matched == 7) {
95                foundTcp = true;
96            }
97            if (!iface || !strcmp(iface, cur_iface)) {
98                stats->rxBytes += rxBytes;
99                stats->rxPackets += rxPackets;
100                stats->txBytes += txBytes;
101                stats->txPackets += txPackets;
102                if (matched == 7) {
103                    stats->tcpRxPackets += tcpRxPackets;
104                    stats->tcpTxPackets += tcpTxPackets;
105                }
106            }
107        }
108    }
109
110    if (!foundTcp) {
111        stats->tcpRxPackets = UNKNOWN;
112        stats->tcpTxPackets = UNKNOWN;
113    }
114
115    if (fclose(fp) != 0) {
116        return -1;
117    }
118    return 0;
119}
120
121static int parseUidStats(const uint32_t uid, struct Stats* stats) {
122    FILE *fp = fopen(QTAGUID_UID_STATS, "r");
123    if (fp == NULL) {
124        return -1;
125    }
126
127    char buffer[384];
128    char iface[32];
129    uint32_t idx, cur_uid, set;
130    uint64_t tag, rxBytes, rxPackets, txBytes, txPackets;
131
132    while (fgets(buffer, sizeof(buffer), fp) != NULL) {
133        if (sscanf(buffer,
134                "%" SCNu32 " %31s 0x%" SCNx64 " %u %u %" SCNu64 " %" SCNu64
135                " %" SCNu64 " %" SCNu64 "",
136                &idx, iface, &tag, &cur_uid, &set, &rxBytes, &rxPackets,
137                &txBytes, &txPackets) == 9) {
138            if (uid == cur_uid && tag == 0L) {
139                stats->rxBytes += rxBytes;
140                stats->rxPackets += rxPackets;
141                stats->txBytes += txBytes;
142                stats->txPackets += txPackets;
143            }
144        }
145    }
146
147    if (fclose(fp) != 0) {
148        return -1;
149    }
150    return 0;
151}
152
153static jlong getTotalStat(JNIEnv* env, jclass clazz, jint type, jboolean useBpfStats) {
154    struct Stats stats;
155    memset(&stats, 0, sizeof(Stats));
156
157    if (useBpfStats) {
158        if (bpfGetIfaceStats(NULL, &stats) == 0) {
159            return getStatsType(&stats, (StatsType) type);
160        } else {
161            return UNKNOWN;
162        }
163    }
164
165    if (parseIfaceStats(NULL, &stats) == 0) {
166        return getStatsType(&stats, (StatsType) type);
167    } else {
168        return UNKNOWN;
169    }
170}
171
172static jlong getIfaceStat(JNIEnv* env, jclass clazz, jstring iface, jint type,
173                          jboolean useBpfStats) {
174    ScopedUtfChars iface8(env, iface);
175    if (iface8.c_str() == NULL) {
176        return UNKNOWN;
177    }
178
179    struct Stats stats;
180    memset(&stats, 0, sizeof(Stats));
181
182    if (useBpfStats) {
183        if (bpfGetIfaceStats(iface8.c_str(), &stats) == 0) {
184            return getStatsType(&stats, (StatsType) type);
185        } else {
186            return UNKNOWN;
187        }
188    }
189
190    if (parseIfaceStats(iface8.c_str(), &stats) == 0) {
191        return getStatsType(&stats, (StatsType) type);
192    } else {
193        return UNKNOWN;
194    }
195}
196
197static jlong getUidStat(JNIEnv* env, jclass clazz, jint uid, jint type, jboolean useBpfStats) {
198    struct Stats stats;
199    memset(&stats, 0, sizeof(Stats));
200
201    if (useBpfStats) {
202        if (bpfGetUidStats(uid, &stats) == 0) {
203            return getStatsType(&stats, (StatsType) type);
204        } else {
205            return UNKNOWN;
206        }
207    }
208
209    if (parseUidStats(uid, &stats) == 0) {
210        return getStatsType(&stats, (StatsType) type);
211    } else {
212        return UNKNOWN;
213    }
214}
215
216static const JNINativeMethod gMethods[] = {
217    {"nativeGetTotalStat", "(IZ)J", (void*) getTotalStat},
218    {"nativeGetIfaceStat", "(Ljava/lang/String;IZ)J", (void*) getIfaceStat},
219    {"nativeGetUidStat", "(IIZ)J", (void*) getUidStat},
220};
221
222int register_android_server_net_NetworkStatsService(JNIEnv* env) {
223    jclass netStatsService = env->FindClass("com/android/server/net/NetworkStatsService");
224    jfieldID rxBytesId = env->GetStaticFieldID(netStatsService, "TYPE_RX_BYTES", "I");
225    jfieldID rxPacketsId = env->GetStaticFieldID(netStatsService, "TYPE_RX_PACKETS", "I");
226    jfieldID txBytesId = env->GetStaticFieldID(netStatsService, "TYPE_TX_BYTES", "I");
227    jfieldID txPacketsId = env->GetStaticFieldID(netStatsService, "TYPE_TX_PACKETS", "I");
228    jfieldID tcpRxPacketsId = env->GetStaticFieldID(netStatsService, "TYPE_TCP_RX_PACKETS", "I");
229    jfieldID tcpTxPacketsId = env->GetStaticFieldID(netStatsService, "TYPE_TCP_TX_PACKETS", "I");
230
231    env->SetStaticIntField(netStatsService, rxBytesId, RX_BYTES);
232    env->SetStaticIntField(netStatsService, rxPacketsId, RX_PACKETS);
233    env->SetStaticIntField(netStatsService, txBytesId, TX_BYTES);
234    env->SetStaticIntField(netStatsService, txPacketsId, TX_PACKETS);
235    env->SetStaticIntField(netStatsService, tcpRxPacketsId, TCP_RX_PACKETS);
236    env->SetStaticIntField(netStatsService, tcpTxPacketsId, TCP_TX_PACKETS);
237
238    return jniRegisterNativeMethods(env, "com/android/server/net/NetworkStatsService", gMethods,
239                                    NELEM(gMethods));
240}
241
242}
243