1 /*
2 * Copyright (C) 2018 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 <string>
18
19 #include <fcntl.h>
20 #include <inttypes.h>
21 #include <limits.h>
22 #include <linux/inet_diag.h>
23 #include <linux/sock_diag.h>
24 #include <net/if.h>
25 #include <sys/socket.h>
26 #include <sys/types.h>
27 #include <unistd.h>
28
29 #include <gtest/gtest.h>
30
31 #include <cutils/qtaguid.h>
32 #include <processgroup/processgroup.h>
33
34 #include <android-base/stringprintf.h>
35 #include <android-base/strings.h>
36
37 #include "bpf/BpfMap.h"
38 #include "bpf/BpfUtils.h"
39 #include "netdbpf/bpf_shared.h"
40
41 using android::netdutils::StatusOr;
42
43 namespace android {
44 namespace bpf {
45
46 // Use the upper limit of uid to avoid conflict with real app uids. We can't use UID_MAX because
47 // it's -1, which is INVALID_UID.
48 constexpr uid_t TEST_UID = UID_MAX - 1;
49 constexpr uint32_t TEST_TAG = 42;
50 constexpr int TEST_COUNTERSET = 1;
51 constexpr int DEFAULT_COUNTERSET = 0;
52
53 #define SKIP_IF_EXTENDED_BPF_NOT_SUPPORTED \
54 do { \
55 if (android::bpf::getBpfSupportLevel() != android::bpf::BpfLevel::EXTENDED) { \
56 GTEST_LOG_(INFO) << "This test is skipped since extended bpf feature" \
57 << "not supported\n"; \
58 return; \
59 } \
60 } while (0)
61
62 class BpfBasicTest : public testing::Test {
63 protected:
BpfBasicTest()64 BpfBasicTest() {}
65 };
66
TEST_F(BpfBasicTest,TestCgroupMounted)67 TEST_F(BpfBasicTest, TestCgroupMounted) {
68 SKIP_IF_BPF_NOT_SUPPORTED;
69
70 std::string cg2_path;
71 ASSERT_EQ(true, CgroupGetControllerPath(CGROUPV2_CONTROLLER_NAME, &cg2_path));
72 ASSERT_EQ(0, access(cg2_path.c_str(), R_OK));
73 ASSERT_EQ(0, access((cg2_path + "/cgroup.controllers").c_str(), R_OK));
74 }
75
TEST_F(BpfBasicTest,TestTrafficControllerSetUp)76 TEST_F(BpfBasicTest, TestTrafficControllerSetUp) {
77 SKIP_IF_BPF_NOT_SUPPORTED;
78
79 ASSERT_EQ(0, access(BPF_EGRESS_PROG_PATH, R_OK));
80 ASSERT_EQ(0, access(BPF_INGRESS_PROG_PATH, R_OK));
81 ASSERT_EQ(0, access(XT_BPF_INGRESS_PROG_PATH, R_OK));
82 ASSERT_EQ(0, access(XT_BPF_EGRESS_PROG_PATH, R_OK));
83 ASSERT_EQ(0, access(COOKIE_TAG_MAP_PATH, R_OK));
84 ASSERT_EQ(0, access(UID_COUNTERSET_MAP_PATH, R_OK));
85 ASSERT_EQ(0, access(STATS_MAP_A_PATH, R_OK));
86 ASSERT_EQ(0, access(STATS_MAP_B_PATH, R_OK));
87 ASSERT_EQ(0, access(IFACE_INDEX_NAME_MAP_PATH, R_OK));
88 ASSERT_EQ(0, access(IFACE_STATS_MAP_PATH, R_OK));
89 ASSERT_EQ(0, access(CONFIGURATION_MAP_PATH, R_OK));
90 ASSERT_EQ(0, access(UID_OWNER_MAP_PATH, R_OK));
91 }
92
TEST_F(BpfBasicTest,TestSocketFilterSetUp)93 TEST_F(BpfBasicTest, TestSocketFilterSetUp) {
94 SKIP_IF_EXTENDED_BPF_NOT_SUPPORTED;
95
96 ASSERT_EQ(0, access(CGROUP_SOCKET_PROG_PATH, R_OK));
97 ASSERT_EQ(0, access(UID_PERMISSION_MAP_PATH, R_OK));
98 }
99
TEST_F(BpfBasicTest,TestTagSocket)100 TEST_F(BpfBasicTest, TestTagSocket) {
101 SKIP_IF_BPF_NOT_SUPPORTED;
102
103 BpfMap<uint64_t, UidTag> cookieTagMap(mapRetrieve(COOKIE_TAG_MAP_PATH, 0));
104 ASSERT_LE(0, cookieTagMap.getMap());
105 int sock = socket(AF_INET6, SOCK_STREAM | SOCK_CLOEXEC, 0);
106 ASSERT_LE(0, sock);
107 uint64_t cookie = getSocketCookie(sock);
108 ASSERT_NE(NONEXISTENT_COOKIE, cookie);
109 ASSERT_EQ(0, qtaguid_tagSocket(sock, TEST_TAG, TEST_UID));
110 StatusOr<UidTag> tagResult = cookieTagMap.readValue(cookie);
111 ASSERT_TRUE(isOk(tagResult));
112 ASSERT_EQ(TEST_UID, tagResult.value().uid);
113 ASSERT_EQ(TEST_TAG, tagResult.value().tag);
114 ASSERT_EQ(0, qtaguid_untagSocket(sock));
115 tagResult = cookieTagMap.readValue(cookie);
116 ASSERT_FALSE(isOk(tagResult));
117 ASSERT_EQ(ENOENT, tagResult.status().code());
118 }
119
TEST_F(BpfBasicTest,TestCloseSocketWithoutUntag)120 TEST_F(BpfBasicTest, TestCloseSocketWithoutUntag) {
121 SKIP_IF_BPF_NOT_SUPPORTED;
122
123 BpfMap<uint64_t, UidTag> cookieTagMap(mapRetrieve(COOKIE_TAG_MAP_PATH, 0));
124 ASSERT_LE(0, cookieTagMap.getMap());
125 int sock = socket(AF_INET6, SOCK_STREAM | SOCK_CLOEXEC, 0);
126 ASSERT_LE(0, sock);
127 uint64_t cookie = getSocketCookie(sock);
128 ASSERT_NE(NONEXISTENT_COOKIE, cookie);
129 ASSERT_EQ(0, qtaguid_tagSocket(sock, TEST_TAG, TEST_UID));
130 StatusOr<UidTag> tagResult = cookieTagMap.readValue(cookie);
131 ASSERT_TRUE(isOk(tagResult));
132 ASSERT_EQ(TEST_UID, tagResult.value().uid);
133 ASSERT_EQ(TEST_TAG, tagResult.value().tag);
134 ASSERT_EQ(0, close(sock));
135 // Check map periodically until sk destroy handler have done its job.
136 for (int i = 0; i < 10; i++) {
137 usleep(5000); // 5ms
138 tagResult = cookieTagMap.readValue(cookie);
139 if (!isOk(tagResult)) {
140 ASSERT_EQ(ENOENT, tagResult.status().code());
141 return;
142 }
143 }
144 FAIL() << "socket tag still exist after 50ms";
145 }
146
TEST_F(BpfBasicTest,TestChangeCounterSet)147 TEST_F(BpfBasicTest, TestChangeCounterSet) {
148 SKIP_IF_BPF_NOT_SUPPORTED;
149
150 BpfMap<uint32_t, uint8_t> uidCounterSetMap(mapRetrieve(UID_COUNTERSET_MAP_PATH, 0));
151 ASSERT_LE(0, uidCounterSetMap.getMap());
152 ASSERT_EQ(0, qtaguid_setCounterSet(TEST_COUNTERSET, TEST_UID));
153 uid_t uid = TEST_UID;
154 StatusOr<uint8_t> counterSetResult = uidCounterSetMap.readValue(uid);
155 ASSERT_TRUE(isOk(counterSetResult));
156 ASSERT_EQ(TEST_COUNTERSET, counterSetResult.value());
157 ASSERT_EQ(0, qtaguid_setCounterSet(DEFAULT_COUNTERSET, TEST_UID));
158 counterSetResult = uidCounterSetMap.readValue(uid);
159 ASSERT_FALSE(isOk(counterSetResult));
160 ASSERT_EQ(ENOENT, counterSetResult.status().code());
161 }
162
TEST_F(BpfBasicTest,TestDeleteTagData)163 TEST_F(BpfBasicTest, TestDeleteTagData) {
164 SKIP_IF_BPF_NOT_SUPPORTED;
165
166 BpfMap<StatsKey, StatsValue> statsMapA(mapRetrieve(STATS_MAP_A_PATH, 0));
167 ASSERT_LE(0, statsMapA.getMap());
168 BpfMap<StatsKey, StatsValue> statsMapB(mapRetrieve(STATS_MAP_B_PATH, 0));
169 ASSERT_LE(0, statsMapB.getMap());
170 BpfMap<uint32_t, StatsValue> appUidStatsMap(mapRetrieve(APP_UID_STATS_MAP_PATH, 0));
171 ASSERT_LE(0, appUidStatsMap.getMap());
172
173 StatsKey key = {.uid = TEST_UID, .tag = TEST_TAG, .counterSet = TEST_COUNTERSET,
174 .ifaceIndex = 1};
175 StatsValue statsMapValue = {.rxPackets = 1, .rxBytes = 100};
176 EXPECT_TRUE(isOk(statsMapB.writeValue(key, statsMapValue, BPF_ANY)));
177 key.tag = 0;
178 EXPECT_TRUE(isOk(statsMapA.writeValue(key, statsMapValue, BPF_ANY)));
179 EXPECT_TRUE(isOk(appUidStatsMap.writeValue(TEST_UID, statsMapValue, BPF_ANY)));
180 ASSERT_EQ(0, qtaguid_deleteTagData(0, TEST_UID));
181 StatusOr<StatsValue> statsResult = statsMapA.readValue(key);
182 ASSERT_FALSE(isOk(statsResult));
183 ASSERT_EQ(ENOENT, statsResult.status().code());
184 statsResult = appUidStatsMap.readValue(TEST_UID);
185 ASSERT_FALSE(isOk(statsResult));
186 ASSERT_EQ(ENOENT, statsResult.status().code());
187 key.tag = TEST_TAG;
188 statsResult = statsMapB.readValue(key);
189 ASSERT_FALSE(isOk(statsResult));
190 ASSERT_EQ(ENOENT, statsResult.status().code());
191 }
192
193 }
194 }
195