| /* |
| * 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 std::string; |
| |
| #define BPF_PROG_PATH "/system/etc/bpf/" |
| |
| int loadAllElfObjects(void) { |
| int retVal = 0; |
| 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; |
| |
| bool critical; |
| int ret = android::bpf::loadProg(progPath.c_str(), &critical); |
| if (ret) { |
| if (critical) retVal = ret; |
| ALOGE("Failed to load object: %s, ret: %s", progPath.c_str(), std::strerror(-ret)); |
| } else { |
| ALOGI("Loaded object: %s", progPath.c_str()); |
| } |
| } |
| closedir(dir); |
| } |
| return retVal; |
| } |
| |
| int main() { |
| if (!android::bpf::isBpfSupported()) return 0; |
| |
| // Load all ELF objects, create programs and maps, and pin them |
| if (loadAllElfObjects() != 0) { |
| ALOGE("=== CRITICAL FAILURE LOADING BPF PROGRAMS ==="); |
| ALOGE("If this triggers reliably, you're probably missing kernel options or patches."); |
| ALOGE("If this triggers randomly, you might be hitting some memory allocation problems or " |
| "startup script race."); |
| ALOGE("--- DO NOT EXPECT SYSTEM TO BOOT SUCCESSFULLY ---"); |
| return 2; |
| } |
| |
| if (android::base::SetProperty("bpf.progs_loaded", "1") == false) { |
| ALOGE("Failed to set bpf.progs_loaded property"); |
| return 1; |
| } |
| |
| return 0; |
| } |