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Chenbo Feng75b410b2018-10-10 15:01:19 -07001/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef LOG_TAG
18#define LOG_TAG "bpfloader"
19#endif
20
21#include <arpa/inet.h>
Joel Fernandesd76a2002018-10-16 13:19:58 -070022#include <dirent.h>
Chenbo Feng75b410b2018-10-10 15:01:19 -070023#include <elf.h>
24#include <error.h>
25#include <fcntl.h>
26#include <inttypes.h>
27#include <linux/bpf.h>
28#include <linux/unistd.h>
29#include <net/if.h>
30#include <stdint.h>
31#include <stdio.h>
32#include <stdlib.h>
33#include <string.h>
34#include <unistd.h>
35
36#include <sys/mman.h>
37#include <sys/socket.h>
38#include <sys/stat.h>
39#include <sys/types.h>
40
Joel Fernandesd3ec8712019-01-11 06:22:05 -050041#include <android-base/properties.h>
Chenbo Feng75b410b2018-10-10 15:01:19 -070042#include <android-base/stringprintf.h>
Joel Fernandesd76a2002018-10-16 13:19:58 -070043#include <android-base/strings.h>
Chenbo Feng75b410b2018-10-10 15:01:19 -070044#include <android-base/unique_fd.h>
Joel Fernandesd76a2002018-10-16 13:19:58 -070045#include <libbpf_android.h>
Chenbo Feng75b410b2018-10-10 15:01:19 -070046#include <log/log.h>
Chenbo Feng75b410b2018-10-10 15:01:19 -070047#include <netdutils/Misc.h>
48#include <netdutils/Slice.h>
49#include "bpf/BpfUtils.h"
Chenbo Feng75b410b2018-10-10 15:01:19 -070050
Joel Fernandesd76a2002018-10-16 13:19:58 -070051using android::base::EndsWith;
Joel Fernandesd76a2002018-10-16 13:19:58 -070052using std::string;
Chenbo Feng75b410b2018-10-10 15:01:19 -070053
Maciej Żenczykowskid8a45782021-01-14 23:36:32 -080054struct {
55 const char* const dir;
56 const char* const prefix;
57} locations[] = {
58 // Tethering mainline module
59 {
60 .dir = "/apex/com.android.tethering/etc/bpf/",
61 .prefix = "tethering/",
62 },
63 // Core operating system
64 {
65 .dir = "/system/etc/bpf/",
66 .prefix = "",
67 },
68};
Chenbo Feng75b410b2018-10-10 15:01:19 -070069
Maciej Żenczykowskid8a45782021-01-14 23:36:32 -080070int loadAllElfObjects(const char* const progDir, const char* const prefix) {
Maciej Żenczykowski89515d92020-06-14 19:27:33 -070071 int retVal = 0;
Joel Fernandesd76a2002018-10-16 13:19:58 -070072 DIR* dir;
73 struct dirent* ent;
74
Hungming Chen4b8e9822020-09-10 15:51:59 +080075 if ((dir = opendir(progDir)) != NULL) {
Joel Fernandesd76a2002018-10-16 13:19:58 -070076 while ((ent = readdir(dir)) != NULL) {
77 string s = ent->d_name;
78 if (!EndsWith(s, ".o")) continue;
79
Hungming Chen4b8e9822020-09-10 15:51:59 +080080 string progPath(progDir);
81 progPath += s;
Joel Fernandesd76a2002018-10-16 13:19:58 -070082
Maciej Żenczykowski89515d92020-06-14 19:27:33 -070083 bool critical;
Maciej Żenczykowskid8a45782021-01-14 23:36:32 -080084 int ret = android::bpf::loadProg(progPath.c_str(), &critical, prefix);
Maciej Żenczykowski89515d92020-06-14 19:27:33 -070085 if (ret) {
86 if (critical) retVal = ret;
87 ALOGE("Failed to load object: %s, ret: %s", progPath.c_str(), std::strerror(-ret));
88 } else {
89 ALOGI("Loaded object: %s", progPath.c_str());
90 }
Joel Fernandesd76a2002018-10-16 13:19:58 -070091 }
92 closedir(dir);
93 }
Maciej Żenczykowski89515d92020-06-14 19:27:33 -070094 return retVal;
Joel Fernandesd76a2002018-10-16 13:19:58 -070095}
96
Maciej Żenczykowskid8a45782021-01-14 23:36:32 -080097void createSysFsBpfSubDir(const char* const prefix) {
98 if (*prefix) {
99 mode_t prevUmask = umask(0);
100
101 string s = "/sys/fs/bpf/";
102 s += prefix;
103
104 errno = 0;
105 int ret = mkdir(s.c_str(), S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO);
106 if (ret && errno != EEXIST) {
107 ALOGW("Failed to create directory: %s, ret: %s", s.c_str(), std::strerror(errno));
108 }
109
110 umask(prevUmask);
111 }
112}
113
Chenbo Feng75b410b2018-10-10 15:01:19 -0700114int main() {
Maciej Żenczykowski567dc562020-06-10 15:56:07 -0700115 // Load all ELF objects, create programs and maps, and pin them
Maciej Żenczykowskid8a45782021-01-14 23:36:32 -0800116 for (const auto location : locations) {
117 createSysFsBpfSubDir(location.prefix);
118 if (loadAllElfObjects(location.dir, location.prefix) != 0) {
119 ALOGE("=== CRITICAL FAILURE LOADING BPF PROGRAMS FROM %s ===", location.dir);
Hungming Chen4b8e9822020-09-10 15:51:59 +0800120 ALOGE("If this triggers reliably, you're probably missing kernel options or patches.");
121 ALOGE("If this triggers randomly, you might be hitting some memory allocation "
122 "problems or startup script race.");
123 ALOGE("--- DO NOT EXPECT SYSTEM TO BOOT SUCCESSFULLY ---");
124 sleep(20);
125 return 2;
126 }
Maciej Żenczykowski89515d92020-06-14 19:27:33 -0700127 }
Joel Fernandesd3ec8712019-01-11 06:22:05 -0500128
129 if (android::base::SetProperty("bpf.progs_loaded", "1") == false) {
Maciej Żenczykowski89515d92020-06-14 19:27:33 -0700130 ALOGE("Failed to set bpf.progs_loaded property");
Joel Fernandesd3ec8712019-01-11 06:22:05 -0500131 return 1;
132 }
133
134 return 0;
Chenbo Feng75b410b2018-10-10 15:01:19 -0700135}