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/*
* Copyright (C) 2022 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 "TrafficControllerJni"
#include "TrafficController.h"
#include <bpf_shared.h>
#include <jni.h>
#include <log/log.h>
#include <nativehelper/JNIHelp.h>
#include <nativehelper/ScopedUtfChars.h>
#include <nativehelper/ScopedPrimitiveArray.h>
#include <netjniutils/netjniutils.h>
#include <net/if.h>
#include <vector>
using android::net::TrafficController;
using android::netdutils::Status;
using UidOwnerMatchType::PENALTY_BOX_MATCH;
using UidOwnerMatchType::HAPPY_BOX_MATCH;
static android::net::TrafficController mTc;
namespace android {
static void native_init(JNIEnv* env, jobject clazz) {
Status status = mTc.start();
if (!isOk(status)) {
ALOGE("%s failed, error code = %d", __func__, status.code());
}
}
static jint native_addNaughtyApp(JNIEnv* env, jobject clazz, jint uid) {
const uint32_t appUids = static_cast<uint32_t>(abs(uid));
Status status = mTc.updateUidOwnerMap(appUids, PENALTY_BOX_MATCH,
TrafficController::IptOp::IptOpInsert);
if (!isOk(status)) {
ALOGE("%s failed, error code = %d", __func__, status.code());
}
return (jint)status.code();
}
static jint native_removeNaughtyApp(JNIEnv* env, jobject clazz, jint uid) {
const uint32_t appUids = static_cast<uint32_t>(abs(uid));
Status status = mTc.updateUidOwnerMap(appUids, PENALTY_BOX_MATCH,
TrafficController::IptOp::IptOpDelete);
if (!isOk(status)) {
ALOGE("%s failed, error code = %d", __func__, status.code());
}
return (jint)status.code();
}
static jint native_addNiceApp(JNIEnv* env, jobject clazz, jint uid) {
const uint32_t appUids = static_cast<uint32_t>(abs(uid));
Status status = mTc.updateUidOwnerMap(appUids, HAPPY_BOX_MATCH,
TrafficController::IptOp::IptOpInsert);
if (!isOk(status)) {
ALOGE("%s failed, error code = %d", __func__, status.code());
}
return (jint)status.code();
}
static jint native_removeNiceApp(JNIEnv* env, jobject clazz, jint uid) {
const uint32_t appUids = static_cast<uint32_t>(abs(uid));
Status status = mTc.updateUidOwnerMap(appUids, HAPPY_BOX_MATCH,
TrafficController::IptOp::IptOpDelete);
if (!isOk(status)) {
ALOGD("%s failed, error code = %d", __func__, status.code());
}
return (jint)status.code();
}
static jint native_setChildChain(JNIEnv* env, jobject clazz, jint childChain, jboolean enable) {
auto chain = static_cast<ChildChain>(childChain);
int res = mTc.toggleUidOwnerMap(chain, enable);
if (res) {
ALOGE("%s failed, error code = %d", __func__, res);
}
return (jint)res;
}
static jint native_replaceUidChain(JNIEnv* env, jobject clazz, jstring name, jboolean isAllowlist,
jintArray jUids) {
const ScopedUtfChars chainNameUtf8(env, name);
if (chainNameUtf8.c_str() == nullptr) {
return -EINVAL;
}
const std::string chainName(chainNameUtf8.c_str());
ScopedIntArrayRO uids(env, jUids);
if (uids.get() == nullptr) {
return -EINVAL;
}
size_t size = uids.size();
static_assert(sizeof(*(uids.get())) == sizeof(int32_t));
std::vector<int32_t> data ((int32_t *)&uids[0], (int32_t*)&uids[size]);
int res = mTc.replaceUidOwnerMap(chainName, isAllowlist, data);
if (res) {
ALOGE("%s failed, error code = %d", __func__, res);
}
return (jint)res;
}
static jint native_setUidRule(JNIEnv* env, jobject clazz, jint childChain, jint uid,
jint firewallRule) {
auto chain = static_cast<ChildChain>(childChain);
auto rule = static_cast<FirewallRule>(firewallRule);
FirewallType fType = mTc.getFirewallType(chain);
int res = mTc.changeUidOwnerRule(chain, uid, rule, fType);
if (res) {
ALOGE("%s failed, error code = %d", __func__, res);
}
return (jint)res;
}
static jint native_addUidInterfaceRules(JNIEnv* env, jobject clazz, jstring ifName,
jintArray jUids) {
// Null ifName is a wildcard to allow apps to receive packets on all interfaces and ifIndex is
// set to 0.
int ifIndex;
if (ifName != nullptr) {
const ScopedUtfChars ifNameUtf8(env, ifName);
const std::string interfaceName(ifNameUtf8.c_str());
ifIndex = if_nametoindex(interfaceName.c_str());
} else {
ifIndex = 0;
}
ScopedIntArrayRO uids(env, jUids);
if (uids.get() == nullptr) {
return -EINVAL;
}
size_t size = uids.size();
static_assert(sizeof(*(uids.get())) == sizeof(int32_t));
std::vector<int32_t> data ((int32_t *)&uids[0], (int32_t*)&uids[size]);
Status status = mTc.addUidInterfaceRules(ifIndex, data);
if (!isOk(status)) {
ALOGE("%s failed, error code = %d", __func__, status.code());
}
return (jint)status.code();
}
static jint native_removeUidInterfaceRules(JNIEnv* env, jobject clazz, jintArray jUids) {
ScopedIntArrayRO uids(env, jUids);
if (uids.get() == nullptr) {
return -EINVAL;
}
size_t size = uids.size();
static_assert(sizeof(*(uids.get())) == sizeof(int32_t));
std::vector<int32_t> data ((int32_t *)&uids[0], (int32_t*)&uids[size]);
Status status = mTc.removeUidInterfaceRules(data);
if (!isOk(status)) {
ALOGE("%s failed, error code = %d", __func__, status.code());
}
return (jint)status.code();
}
static jint native_swapActiveStatsMap(JNIEnv* env, jobject clazz) {
Status status = mTc.swapActiveStatsMap();
if (!isOk(status)) {
ALOGD("%s failed, error code = %d", __func__, status.code());
}
return (jint)status.code();
}
static void native_setPermissionForUids(JNIEnv* env, jobject clazz, jint permission,
jintArray jUids) {
ScopedIntArrayRO uids(env, jUids);
if (uids.get() == nullptr) return;
size_t size = uids.size();
static_assert(sizeof(*(uids.get())) == sizeof(uid_t));
std::vector<uid_t> data ((uid_t *)&uids[0], (uid_t*)&uids[size]);
mTc.setPermissionForUids(permission, data);
}
static void native_dump(JNIEnv* env, jobject clazz, jobject javaFd, jboolean verbose) {
int fd = netjniutils::GetNativeFileDescriptor(env, javaFd);
if (fd < 0) {
jniThrowExceptionFmt(env, "java/io/IOException", "Invalid file descriptor");
return;
}
mTc.dump(fd, verbose);
}
/*
* JNI registration.
*/
// clang-format off
static const JNINativeMethod gMethods[] = {
/* name, signature, funcPtr */
{"native_init", "()V",
(void*)native_init},
{"native_addNaughtyApp", "(I)I",
(void*)native_addNaughtyApp},
{"native_removeNaughtyApp", "(I)I",
(void*)native_removeNaughtyApp},
{"native_addNiceApp", "(I)I",
(void*)native_addNiceApp},
{"native_removeNiceApp", "(I)I",
(void*)native_removeNiceApp},
{"native_setChildChain", "(IZ)I",
(void*)native_setChildChain},
{"native_replaceUidChain", "(Ljava/lang/String;Z[I)I",
(void*)native_replaceUidChain},
{"native_setUidRule", "(III)I",
(void*)native_setUidRule},
{"native_addUidInterfaceRules", "(Ljava/lang/String;[I)I",
(void*)native_addUidInterfaceRules},
{"native_removeUidInterfaceRules", "([I)I",
(void*)native_removeUidInterfaceRules},
{"native_swapActiveStatsMap", "()I",
(void*)native_swapActiveStatsMap},
{"native_setPermissionForUids", "(I[I)V",
(void*)native_setPermissionForUids},
{"native_dump", "(Ljava/io/FileDescriptor;Z)V",
(void*)native_dump},
};
// clang-format on
int register_com_android_server_BpfNetMaps(JNIEnv* env) {
return jniRegisterNativeMethods(env,
"com/android/server/BpfNetMaps",
gMethods, NELEM(gMethods));
}
}; // namespace android
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