You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
115 lines
3.3 KiB
115 lines
3.3 KiB
/*
|
|
* 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/unique_fd.h>
|
|
#include <log/log.h>
|
|
#include <processgroup/processgroup.h>
|
|
|
|
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 = 1073741824, // 1 GiB
|
|
.rlim_max = 1073741824, // 1 GiB
|
|
};
|
|
int res = setrlimit(RLIMIT_MEMLOCK, &limit);
|
|
if (res) {
|
|
ALOGE("Failed to set the default MEMLOCK rlimit: %s", strerror(errno));
|
|
}
|
|
return res;
|
|
}
|
|
|
|
unsigned kernelVersion() {
|
|
struct utsname buf;
|
|
int ret = uname(&buf);
|
|
if (ret) return 0;
|
|
|
|
unsigned kver_major;
|
|
unsigned kver_minor;
|
|
unsigned kver_sub;
|
|
char dummy;
|
|
ret = sscanf(buf.release, "%u.%u.%u%c", &kver_major, &kver_minor, &kver_sub, &dummy);
|
|
// Check the device kernel version
|
|
if (ret < 3) return 0;
|
|
|
|
return KVER(kver_major, kver_minor, kver_sub);
|
|
}
|
|
|
|
} // namespace bpf
|
|
} // namespace android
|