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/*
* 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
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