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/*
* Copyright 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.
*
* TcUtilsTest.cpp - unit tests for TcUtils.cpp
*/
#include <gtest/gtest.h>
#include "bpf/KernelUtils.h"
#include <tcutils/tcutils.h>
#include <BpfSyscallWrappers.h>
#include <errno.h>
#include <linux/if_ether.h>
namespace android {
TEST(LibTcUtilsTest, IsEthernetOfNonExistingIf) {
bool result = false;
int error = isEthernet("not_existing_if", result);
ASSERT_FALSE(result);
ASSERT_EQ(-ENODEV, error);
}
TEST(LibTcUtilsTest, IsEthernetOfLoopback) {
bool result = false;
int error = isEthernet("lo", result);
ASSERT_FALSE(result);
ASSERT_EQ(-EAFNOSUPPORT, error);
}
// If wireless 'wlan0' interface exists it should be Ethernet.
// See also HardwareAddressTypeOfWireless.
TEST(LibTcUtilsTest, IsEthernetOfWireless) {
bool result = false;
int error = isEthernet("wlan0", result);
if (!result && error == -ENODEV)
return;
ASSERT_EQ(0, error);
ASSERT_TRUE(result);
}
// If cellular 'rmnet_data0' interface exists it should
// *probably* not be Ethernet and instead be RawIp.
// See also HardwareAddressTypeOfCellular.
TEST(LibTcUtilsTest, IsEthernetOfCellular) {
bool result = false;
int error = isEthernet("rmnet_data0", result);
if (!result && error == -ENODEV)
return;
ASSERT_EQ(0, error);
ASSERT_FALSE(result);
}
// See Linux kernel source in include/net/flow.h
static constexpr int LOOPBACK_IFINDEX = 1;
TEST(LibTcUtilsTest, AttachReplaceDetachClsactLo) {
// This attaches and detaches a configuration-less and thus no-op clsact
// qdisc to loopback interface (and it takes fractions of a second)
EXPECT_EQ(0, tcAddQdiscClsact(LOOPBACK_IFINDEX));
EXPECT_EQ(0, tcReplaceQdiscClsact(LOOPBACK_IFINDEX));
EXPECT_EQ(0, tcDeleteQdiscClsact(LOOPBACK_IFINDEX));
EXPECT_EQ(-EINVAL, tcDeleteQdiscClsact(LOOPBACK_IFINDEX));
}
TEST(LibTcUtilsTest, AddAndDeleteBpfFilter) {
// TODO: this should likely be in the tethering module, where using netd.h would be ok
static constexpr char bpfProgPath[] =
"/sys/fs/bpf/tethering/prog_offload_schedcls_tether_downstream6_ether";
const int errNOENT = bpf::isAtLeastKernelVersion(4, 19, 0) ? ENOENT : EINVAL;
// static test values
static constexpr bool ingress = true;
static constexpr uint16_t prio = 17;
static constexpr uint16_t proto = ETH_P_ALL;
// try to delete missing filter from missing qdisc
EXPECT_EQ(-EINVAL, tcDeleteFilter(LOOPBACK_IFINDEX, ingress, prio, proto));
// try to attach bpf filter to missing qdisc
EXPECT_EQ(-EINVAL, tcAddBpfFilter(LOOPBACK_IFINDEX, ingress, prio, proto,
bpfProgPath));
// add the clsact qdisc
EXPECT_EQ(0, tcAddQdiscClsact(LOOPBACK_IFINDEX));
// try to delete missing filter when there is a qdisc attached
EXPECT_EQ(-errNOENT, tcDeleteFilter(LOOPBACK_IFINDEX, ingress, prio, proto));
// add and delete a bpf filter
EXPECT_EQ(
0, tcAddBpfFilter(LOOPBACK_IFINDEX, ingress, prio, proto, bpfProgPath));
EXPECT_EQ(0, tcDeleteFilter(LOOPBACK_IFINDEX, ingress, prio, proto));
// try to remove the same filter a second time
EXPECT_EQ(-errNOENT, tcDeleteFilter(LOOPBACK_IFINDEX, ingress, prio, proto));
// remove the clsact qdisc
EXPECT_EQ(0, tcDeleteQdiscClsact(LOOPBACK_IFINDEX));
// once again, try to delete missing filter from missing qdisc
EXPECT_EQ(-EINVAL, tcDeleteFilter(LOOPBACK_IFINDEX, ingress, prio, proto));
}
TEST(LibTcUtilsTest, AddAndDeleteIngressPoliceFilter) {
// TODO: this should likely be in the tethering module, where using netd.h would be ok
static constexpr char bpfProgPath[] =
"/sys/fs/bpf/netd_shared/prog_netd_schedact_ingress_account";
int fd = bpf::retrieveProgram(bpfProgPath);
ASSERT_LE(3, fd);
close(fd);
const int errNOENT = bpf::isAtLeastKernelVersion(4, 19, 0) ? ENOENT : EINVAL;
// static test values
static constexpr unsigned rateInBytesPerSec =
1024 * 1024; // 8mbit/s => 1mbyte/s => 1024*1024 bytes/s.
static constexpr uint16_t prio = 17;
static constexpr uint16_t proto = ETH_P_ALL;
// try to delete missing filter from missing qdisc
EXPECT_EQ(-EINVAL,
tcDeleteFilter(LOOPBACK_IFINDEX, true /*ingress*/, prio, proto));
// try to attach bpf filter to missing qdisc
EXPECT_EQ(-EINVAL, tcAddIngressPoliceFilter(LOOPBACK_IFINDEX, prio, proto,
rateInBytesPerSec, bpfProgPath));
// add the clsact qdisc
EXPECT_EQ(0, tcAddQdiscClsact(LOOPBACK_IFINDEX));
// try to delete missing filter when there is a qdisc attached
EXPECT_EQ(-errNOENT,
tcDeleteFilter(LOOPBACK_IFINDEX, true /*ingress*/, prio, proto));
// add and delete a bpf filter
EXPECT_EQ(0, tcAddIngressPoliceFilter(LOOPBACK_IFINDEX, prio, proto,
rateInBytesPerSec, bpfProgPath));
EXPECT_EQ(0, tcDeleteFilter(LOOPBACK_IFINDEX, true /*ingress*/, prio, proto));
// try to remove the same filter a second time
EXPECT_EQ(-errNOENT,
tcDeleteFilter(LOOPBACK_IFINDEX, true /*ingress*/, prio, proto));
// remove the clsact qdisc
EXPECT_EQ(0, tcDeleteQdiscClsact(LOOPBACK_IFINDEX));
// once again, try to delete missing filter from missing qdisc
EXPECT_EQ(-EINVAL,
tcDeleteFilter(LOOPBACK_IFINDEX, true /*ingress*/, prio, proto));
}
} // namespace android
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