b20d28df6a
The bpfloader should not try to load bpf objects on unsupported devices since devices with 4.4 kernel can have bpf maps but not bpf pogram support. Creating bpf maps on those devices would mislead the framework code to use an unsupported code path and crash system server. Bug: 130687855 Test: cuttlefish boot test for 4.4 kernel. Change-Id: I43ffc01e1099ee3effaa6ba30aa78080d5bec72f
106 lines
3 KiB
C++
106 lines
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.
|
|
*/
|
|
|
|
#ifndef LOG_TAG
|
|
#define LOG_TAG "bpfloader"
|
|
#endif
|
|
|
|
#include <arpa/inet.h>
|
|
#include <dirent.h>
|
|
#include <elf.h>
|
|
#include <error.h>
|
|
#include <fcntl.h>
|
|
#include <inttypes.h>
|
|
#include <linux/bpf.h>
|
|
#include <linux/unistd.h>
|
|
#include <net/if.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include <sys/mman.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <android-base/properties.h>
|
|
#include <android-base/stringprintf.h>
|
|
#include <android-base/strings.h>
|
|
#include <android-base/unique_fd.h>
|
|
#include <libbpf_android.h>
|
|
#include <log/log.h>
|
|
#include <netdutils/Misc.h>
|
|
#include <netdutils/Slice.h>
|
|
#include "bpf/BpfUtils.h"
|
|
|
|
using android::base::EndsWith;
|
|
using android::base::unique_fd;
|
|
using std::string;
|
|
|
|
#define BPF_PROG_PATH "/system/etc/bpf/"
|
|
|
|
#define CLEANANDEXIT(ret, mapPatterns) \
|
|
do { \
|
|
for (size_t i = 0; i < mapPatterns.size(); i++) { \
|
|
if (mapPatterns[i].fd > -1) { \
|
|
close(mapPatterns[i].fd); \
|
|
} \
|
|
} \
|
|
return ret; \
|
|
} while (0)
|
|
|
|
using android::bpf::BpfMapInfo;
|
|
using android::bpf::BpfProgInfo;
|
|
|
|
void loadAllElfObjects(void) {
|
|
DIR* dir;
|
|
struct dirent* ent;
|
|
|
|
if ((dir = opendir(BPF_PROG_PATH)) != NULL) {
|
|
while ((ent = readdir(dir)) != NULL) {
|
|
string s = ent->d_name;
|
|
if (!EndsWith(s, ".o")) continue;
|
|
|
|
string progPath = BPF_PROG_PATH + s;
|
|
|
|
int ret = android::bpf::loadProg(progPath.c_str());
|
|
ALOGI("Attempted load object: %s, ret: %s", progPath.c_str(), std::strerror(-ret));
|
|
}
|
|
closedir(dir);
|
|
}
|
|
}
|
|
|
|
int main() {
|
|
std::string value = android::base::GetProperty("bpf.progs_loaded", "");
|
|
if (value == "1") {
|
|
ALOGI("Property bpf.progs_loaded is set, progs already loaded.\n");
|
|
return 0;
|
|
}
|
|
|
|
if (android::bpf::getBpfSupportLevel() != android::bpf::BpfLevel::NONE) {
|
|
// Load all ELF objects, create programs and maps, and pin them
|
|
loadAllElfObjects();
|
|
}
|
|
|
|
if (android::base::SetProperty("bpf.progs_loaded", "1") == false) {
|
|
ALOGE("Failed to set bpf.progs_loaded property\n");
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|