974e0ed197
Test: builds Signed-off-by: Maciej Żenczykowski <maze@google.com> Change-Id: I4ffa11220794d64c324d9de8890ba27cac986710
139 lines
4.3 KiB
C++
139 lines
4.3 KiB
C++
/*
|
|
* Copyright (C) 2017 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.
|
|
*/
|
|
|
|
#define LOG_TAG "BpfUtils"
|
|
|
|
#include "bpf/BpfUtils.h"
|
|
|
|
#include <elf.h>
|
|
#include <inttypes.h>
|
|
#include <linux/bpf.h>
|
|
#include <linux/if_ether.h>
|
|
#include <linux/in.h>
|
|
#include <linux/pfkeyv2.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/utsname.h>
|
|
#include <sstream>
|
|
#include <string>
|
|
|
|
#include <android-base/properties.h>
|
|
#include <android-base/unique_fd.h>
|
|
#include <log/log.h>
|
|
#include <processgroup/processgroup.h>
|
|
|
|
using android::base::GetUintProperty;
|
|
using android::base::unique_fd;
|
|
|
|
// The buffer size for the buffer that records program loading logs, needs to be large enough for
|
|
// the largest kernel program.
|
|
|
|
namespace android {
|
|
namespace bpf {
|
|
|
|
uint64_t getSocketCookie(int sockFd) {
|
|
uint64_t sock_cookie;
|
|
socklen_t cookie_len = sizeof(sock_cookie);
|
|
int res = getsockopt(sockFd, SOL_SOCKET, SO_COOKIE, &sock_cookie, &cookie_len);
|
|
if (res < 0) {
|
|
res = -errno;
|
|
ALOGE("Failed to get socket cookie: %s\n", strerror(errno));
|
|
errno = -res;
|
|
// 0 is an invalid cookie. See sock_gen_cookie.
|
|
return NONEXISTENT_COOKIE;
|
|
}
|
|
return sock_cookie;
|
|
}
|
|
|
|
int synchronizeKernelRCU() {
|
|
// This is a temporary hack for network stats map swap on devices running
|
|
// 4.9 kernels. The kernel code of socket release on pf_key socket will
|
|
// explicitly call synchronize_rcu() which is exactly what we need.
|
|
int pfSocket = socket(AF_KEY, SOCK_RAW | SOCK_CLOEXEC, PF_KEY_V2);
|
|
|
|
if (pfSocket < 0) {
|
|
int ret = -errno;
|
|
ALOGE("create PF_KEY socket failed: %s", strerror(errno));
|
|
return ret;
|
|
}
|
|
|
|
// When closing socket, synchronize_rcu() gets called in sock_release().
|
|
if (close(pfSocket)) {
|
|
int ret = -errno;
|
|
ALOGE("failed to close the PF_KEY socket: %s", strerror(errno));
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int setrlimitForTest() {
|
|
// Set the memory rlimit for the test process if the default MEMLOCK rlimit is not enough.
|
|
struct rlimit limit = {
|
|
.rlim_cur = 8388608, // 8 MiB
|
|
.rlim_max = 8388608, // 8 MiB
|
|
};
|
|
int res = setrlimit(RLIMIT_MEMLOCK, &limit);
|
|
if (res) {
|
|
ALOGE("Failed to set the default MEMLOCK rlimit: %s", strerror(errno));
|
|
}
|
|
return res;
|
|
}
|
|
|
|
std::string BpfLevelToString(BpfLevel bpfLevel) {
|
|
switch (bpfLevel) {
|
|
case BpfLevel::NONE: return "NONE_SUPPORT";
|
|
case BpfLevel::BASIC: return "BPF_LEVEL_BASIC";
|
|
case BpfLevel::EXTENDED: return "BPF_LEVEL_EXTENDED";
|
|
// No default statement. We want to see errors of the form:
|
|
// "enumeration value 'BPF_LEVEL_xxx' not handled in switch [-Werror,-Wswitch]".
|
|
}
|
|
}
|
|
|
|
BpfLevel getBpfSupportLevel() {
|
|
struct utsname buf;
|
|
int kernel_version_major;
|
|
int kernel_version_minor;
|
|
|
|
uint64_t api_level = GetUintProperty<uint64_t>("ro.product.first_api_level", 0);
|
|
if (api_level == 0) {
|
|
ALOGE("Cannot determine initial API level of the device");
|
|
api_level = GetUintProperty<uint64_t>("ro.build.version.sdk", 0);
|
|
}
|
|
|
|
// Check if the device is shipped originally with android P.
|
|
if (api_level < MINIMUM_API_REQUIRED) return BpfLevel::NONE;
|
|
|
|
int ret = uname(&buf);
|
|
if (ret) {
|
|
return BpfLevel::NONE;
|
|
}
|
|
char dummy;
|
|
ret = sscanf(buf.release, "%d.%d%c", &kernel_version_major, &kernel_version_minor, &dummy);
|
|
// Check the device kernel version
|
|
if (ret < 2) return BpfLevel::NONE;
|
|
if (kernel_version_major > 4 || (kernel_version_major == 4 && kernel_version_minor >= 14))
|
|
return BpfLevel::EXTENDED;
|
|
if (kernel_version_major == 4 && kernel_version_minor >= 9) return BpfLevel::BASIC;
|
|
|
|
return BpfLevel::NONE;
|
|
}
|
|
|
|
} // namespace bpf
|
|
} // namespace android
|