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136 lines
3.8 KiB
136 lines
3.8 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef LOG_TAG
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#define LOG_TAG "bpfloader"
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#endif
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#include <arpa/inet.h>
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#include <dirent.h>
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#include <elf.h>
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#include <error.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <linux/bpf.h>
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#include <linux/unistd.h>
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#include <net/if.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <android-base/properties.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#include <android-base/unique_fd.h>
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#include <libbpf_android.h>
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#include <log/log.h>
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#include <netdutils/Misc.h>
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#include <netdutils/Slice.h>
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#include "bpf/BpfUtils.h"
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using android::base::EndsWith;
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using std::string;
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struct {
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const char* const dir;
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const char* const prefix;
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} locations[] = {
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// Tethering mainline module
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{
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.dir = "/apex/com.android.tethering/etc/bpf/",
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.prefix = "tethering/",
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},
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// Core operating system
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{
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.dir = "/system/etc/bpf/",
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.prefix = "",
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},
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};
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int loadAllElfObjects(const char* const progDir, const char* const prefix) {
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int retVal = 0;
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DIR* dir;
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struct dirent* ent;
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if ((dir = opendir(progDir)) != NULL) {
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while ((ent = readdir(dir)) != NULL) {
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string s = ent->d_name;
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if (!EndsWith(s, ".o")) continue;
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string progPath(progDir);
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progPath += s;
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bool critical;
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int ret = android::bpf::loadProg(progPath.c_str(), &critical, prefix);
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if (ret) {
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if (critical) retVal = ret;
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ALOGE("Failed to load object: %s, ret: %s", progPath.c_str(), std::strerror(-ret));
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} else {
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ALOGI("Loaded object: %s", progPath.c_str());
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}
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}
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closedir(dir);
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}
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return retVal;
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}
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void createSysFsBpfSubDir(const char* const prefix) {
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if (*prefix) {
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mode_t prevUmask = umask(0);
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string s = "/sys/fs/bpf/";
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s += prefix;
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errno = 0;
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int ret = mkdir(s.c_str(), S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO);
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if (ret && errno != EEXIST) {
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ALOGW("Failed to create directory: %s, ret: %s", s.c_str(), std::strerror(errno));
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}
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umask(prevUmask);
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}
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}
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int main() {
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// Load all ELF objects, create programs and maps, and pin them
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for (const auto location : locations) {
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createSysFsBpfSubDir(location.prefix);
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if (loadAllElfObjects(location.dir, location.prefix) != 0) {
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ALOGE("=== CRITICAL FAILURE LOADING BPF PROGRAMS FROM %s ===", location.dir);
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ALOGE("If this triggers reliably, you're probably missing kernel options or patches.");
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ALOGE("If this triggers randomly, you might be hitting some memory allocation "
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"problems or startup script race.");
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ALOGE("--- DO NOT EXPECT SYSTEM TO BOOT SUCCESSFULLY ---");
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sleep(20);
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return 2;
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}
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}
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if (android::base::SetProperty("bpf.progs_loaded", "1") == false) {
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ALOGE("Failed to set bpf.progs_loaded property");
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return 1;
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}
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return 0;
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}
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