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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <android-base/file.h>
#include <android-base/macros.h>
#include <android-base/result-gmock.h>
#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include <stdlib.h>
#include <unistd.h>
#include "BpfSyscallWrappers.h"
#include "bpf/BpfRingbuf.h"
#include "bpf/BpfUtils.h"
#include "bpf/KernelUtils.h"
#define TEST_RINGBUF_MAGIC_NUM 12345
namespace android {
namespace bpf {
using ::android::base::testing::HasError;
using ::android::base::testing::HasValue;
using ::android::base::testing::WithCode;
using ::testing::AllOf;
using ::testing::Gt;
using ::testing::HasSubstr;
using ::testing::Lt;
class BpfRingbufTest : public ::testing::Test {
protected:
BpfRingbufTest()
: mProgPath("/sys/fs/bpf/prog_bpfRingbufProg_skfilter_ringbuf_test"),
mRingbufPath("/sys/fs/bpf/map_bpfRingbufProg_test_ringbuf") {}
void SetUp() {
if (!android::bpf::isAtLeastKernelVersion(5, 8, 0)) {
GTEST_SKIP() << "BPF ring buffers not supported below 5.8";
}
errno = 0;
mProgram.reset(retrieveProgram(mProgPath.c_str()));
EXPECT_EQ(errno, 0);
ASSERT_GE(mProgram.get(), 0)
<< mProgPath << " was either not found or inaccessible.";
}
void RunProgram() {
char fake_skb[128] = {};
EXPECT_EQ(runProgram(mProgram, fake_skb, sizeof(fake_skb)), 0);
}
void RunTestN(int n) {
int run_count = 0;
uint64_t output = 0;
auto callback = [&](const uint64_t& value) {
output = value;
run_count++;
};
auto result = BpfRingbuf<uint64_t>::Create(mRingbufPath.c_str());
ASSERT_RESULT_OK(result);
for (int i = 0; i < n; i++) {
RunProgram();
}
EXPECT_THAT(result.value()->ConsumeAll(callback), HasValue(n));
EXPECT_EQ(output, TEST_RINGBUF_MAGIC_NUM);
EXPECT_EQ(run_count, n);
}
std::string mProgPath;
std::string mRingbufPath;
android::base::unique_fd mProgram;
};
TEST_F(BpfRingbufTest, ConsumeSingle) { RunTestN(1); }
TEST_F(BpfRingbufTest, ConsumeMultiple) { RunTestN(3); }
TEST_F(BpfRingbufTest, FillAndWrap) {
int run_count = 0;
auto callback = [&](const uint64_t&) { run_count++; };
auto result = BpfRingbuf<uint64_t>::Create(mRingbufPath.c_str());
ASSERT_RESULT_OK(result);
// 4kb buffer with 16 byte payloads (8 byte data, 8 byte header) should fill
// after 255 iterations. Exceed that so that some events are dropped.
constexpr int iterations = 300;
for (int i = 0; i < iterations; i++) {
RunProgram();
}
// Some events were dropped, but consume all that succeeded.
EXPECT_THAT(result.value()->ConsumeAll(callback),
HasValue(AllOf(Gt(250), Lt(260))));
EXPECT_THAT(run_count, AllOf(Gt(250), Lt(260)));
// After consuming everything, we should be able to use the ring buffer again.
run_count = 0;
RunProgram();
EXPECT_THAT(result.value()->ConsumeAll(callback), HasValue(1));
EXPECT_EQ(run_count, 1);
}
TEST_F(BpfRingbufTest, WrongTypeSize) {
// The program under test writes 8-byte uint64_t values so a ringbuffer for
// 1-byte uint8_t values will fail to read from it. Note that the map_def does
// not specify the value size, so we fail on read, not creation.
auto result = BpfRingbuf<uint8_t>::Create(mRingbufPath.c_str());
ASSERT_RESULT_OK(result);
RunProgram();
EXPECT_THAT(result.value()->ConsumeAll([](const uint8_t&) {}),
HasError(WithCode(EMSGSIZE)));
}
TEST_F(BpfRingbufTest, InvalidPath) {
EXPECT_THAT(BpfRingbuf<int>::Create("/sys/fs/bpf/bad_path"),
HasError(WithCode(ENOENT)));
}
} // namespace bpf
} // namespace android
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