| /** |
| * Copyright (c) 2016, 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 "Netd" |
| |
| #include <vector> |
| |
| #include <android-base/stringprintf.h> |
| #include <cutils/log.h> |
| #include <utils/Errors.h> |
| #include <utils/String16.h> |
| |
| #include <binder/IPCThreadState.h> |
| #include <binder/IServiceManager.h> |
| #include "android/net/BnNetd.h" |
| |
| #include "Controllers.h" |
| #include "DumpWriter.h" |
| #include "InterfaceController.h" |
| #include "NetdConstants.h" |
| #include "NetdNativeService.h" |
| #include "RouteController.h" |
| #include "SockDiag.h" |
| #include "UidRanges.h" |
| |
| using android::base::StringPrintf; |
| |
| namespace android { |
| namespace net { |
| |
| namespace { |
| |
| const char CONNECTIVITY_INTERNAL[] = "android.permission.CONNECTIVITY_INTERNAL"; |
| const char DUMP[] = "android.permission.DUMP"; |
| |
| binder::Status checkPermission(const char *permission) { |
| pid_t pid; |
| uid_t uid; |
| |
| if (checkCallingPermission(String16(permission), (int32_t *) &pid, (int32_t *) &uid)) { |
| return binder::Status::ok(); |
| } else { |
| auto err = StringPrintf("UID %d / PID %d lacks permission %s", uid, pid, permission); |
| return binder::Status::fromExceptionCode(binder::Status::EX_SECURITY, String8(err.c_str())); |
| } |
| } |
| |
| #define ENFORCE_PERMISSION(permission) { \ |
| binder::Status status = checkPermission((permission)); \ |
| if (!status.isOk()) { \ |
| return status; \ |
| } \ |
| } |
| |
| #define NETD_LOCKING_RPC(permission, lock) \ |
| ENFORCE_PERMISSION(permission); \ |
| android::RWLock::AutoWLock _lock(lock); |
| |
| #define NETD_BIG_LOCK_RPC(permission) NETD_LOCKING_RPC((permission), gBigNetdLock) |
| } // namespace |
| |
| |
| status_t NetdNativeService::start() { |
| IPCThreadState::self()->disableBackgroundScheduling(true); |
| status_t ret = BinderService<NetdNativeService>::publish(); |
| if (ret != android::OK) { |
| return ret; |
| } |
| sp<ProcessState> ps(ProcessState::self()); |
| ps->startThreadPool(); |
| ps->giveThreadPoolName(); |
| return android::OK; |
| } |
| |
| status_t NetdNativeService::dump(int fd, const Vector<String16> & /* args */) { |
| const binder::Status dump_permission = checkPermission(DUMP); |
| if (!dump_permission.isOk()) { |
| const String8 msg(dump_permission.toString8()); |
| write(fd, msg.string(), msg.size()); |
| return PERMISSION_DENIED; |
| } |
| |
| // This method does not grab any locks. If individual classes need locking |
| // their dump() methods MUST handle locking appropriately. |
| DumpWriter dw(fd); |
| dw.blankline(); |
| gCtls->netCtrl.dump(dw); |
| dw.blankline(); |
| |
| return NO_ERROR; |
| } |
| |
| binder::Status NetdNativeService::isAlive(bool *alive) { |
| NETD_BIG_LOCK_RPC(CONNECTIVITY_INTERNAL); |
| |
| *alive = true; |
| return binder::Status::ok(); |
| } |
| |
| binder::Status NetdNativeService::firewallReplaceUidChain(const android::String16& chainName, |
| bool isWhitelist, const std::vector<int32_t>& uids, bool *ret) { |
| NETD_LOCKING_RPC(CONNECTIVITY_INTERNAL, gCtls->firewallCtrl.lock); |
| |
| android::String8 name = android::String8(chainName); |
| int err = gCtls->firewallCtrl.replaceUidChain(name.string(), isWhitelist, uids); |
| *ret = (err == 0); |
| return binder::Status::ok(); |
| } |
| |
| binder::Status NetdNativeService::bandwidthEnableDataSaver(bool enable, bool *ret) { |
| NETD_LOCKING_RPC(CONNECTIVITY_INTERNAL, gCtls->bandwidthCtrl.lock); |
| |
| int err = gCtls->bandwidthCtrl.enableDataSaver(enable); |
| *ret = (err == 0); |
| return binder::Status::ok(); |
| } |
| |
| binder::Status NetdNativeService::networkRejectNonSecureVpn(bool add, |
| const std::vector<UidRange>& uidRangeArray) { |
| // TODO: elsewhere RouteController is only used from the tethering and network controllers, so |
| // it should be possible to use the same lock as NetworkController. However, every call through |
| // the CommandListener "network" command will need to hold this lock too, not just the ones that |
| // read/modify network internal state (that is sufficient for ::dump() because it doesn't |
| // look at routes, but it's not enough here). |
| NETD_BIG_LOCK_RPC(CONNECTIVITY_INTERNAL); |
| |
| UidRanges uidRanges(uidRangeArray); |
| |
| int err; |
| if (add) { |
| err = RouteController::addUsersToRejectNonSecureNetworkRule(uidRanges); |
| } else { |
| err = RouteController::removeUsersFromRejectNonSecureNetworkRule(uidRanges); |
| } |
| |
| if (err != 0) { |
| return binder::Status::fromServiceSpecificError(-err, |
| String8::format("RouteController error: %s", strerror(-err))); |
| } |
| return binder::Status::ok(); |
| } |
| |
| binder::Status NetdNativeService::socketDestroy(const std::vector<UidRange>& uids, |
| const std::vector<int32_t>& skipUids) { |
| |
| ENFORCE_PERMISSION(CONNECTIVITY_INTERNAL); |
| |
| SockDiag sd; |
| if (!sd.open()) { |
| return binder::Status::fromServiceSpecificError(EIO, |
| String8("Could not open SOCK_DIAG socket")); |
| } |
| |
| UidRanges uidRanges(uids); |
| int err = sd.destroySockets(uidRanges, std::set<uid_t>(skipUids.begin(), skipUids.end()), |
| true /* excludeLoopback */); |
| |
| if (err) { |
| return binder::Status::fromServiceSpecificError(-err, |
| String8::format("destroySockets: %s", strerror(-err))); |
| } |
| return binder::Status::ok(); |
| } |
| |
| binder::Status NetdNativeService::setResolverConfiguration(int32_t netId, |
| const std::vector<std::string>& servers, const std::vector<std::string>& domains, |
| const std::vector<int32_t>& params) { |
| // This function intentionally does not lock within Netd, as Bionic is thread-safe. |
| ENFORCE_PERMISSION(CONNECTIVITY_INTERNAL); |
| |
| int err = gCtls->resolverCtrl.setResolverConfiguration(netId, servers, domains, params); |
| if (err != 0) { |
| return binder::Status::fromServiceSpecificError(-err, |
| String8::format("ResolverController error: %s", strerror(-err))); |
| } |
| return binder::Status::ok(); |
| } |
| |
| binder::Status NetdNativeService::getResolverInfo(int32_t netId, |
| std::vector<std::string>* servers, std::vector<std::string>* domains, |
| std::vector<int32_t>* params, std::vector<int32_t>* stats) { |
| // This function intentionally does not lock within Netd, as Bionic is thread-safe. |
| ENFORCE_PERMISSION(CONNECTIVITY_INTERNAL); |
| |
| int err = gCtls->resolverCtrl.getResolverInfo(netId, servers, domains, params, stats); |
| if (err != 0) { |
| return binder::Status::fromServiceSpecificError(-err, |
| String8::format("ResolverController error: %s", strerror(-err))); |
| } |
| return binder::Status::ok(); |
| } |
| |
| binder::Status NetdNativeService::tetherApplyDnsInterfaces(bool *ret) { |
| NETD_BIG_LOCK_RPC(CONNECTIVITY_INTERNAL); |
| |
| *ret = gCtls->tetherCtrl.applyDnsInterfaces(); |
| return binder::Status::ok(); |
| } |
| |
| binder::Status NetdNativeService::interfaceAddAddress(const std::string &ifName, |
| const std::string &addrString, int prefixLength) { |
| ENFORCE_PERMISSION(CONNECTIVITY_INTERNAL); |
| |
| const int err = InterfaceController::addAddress( |
| ifName.c_str(), addrString.c_str(), prefixLength); |
| if (err != 0) { |
| return binder::Status::fromServiceSpecificError(-err, |
| String8::format("InterfaceController error: %s", strerror(-err))); |
| } |
| return binder::Status::ok(); |
| } |
| |
| binder::Status NetdNativeService::interfaceDelAddress(const std::string &ifName, |
| const std::string &addrString, int prefixLength) { |
| ENFORCE_PERMISSION(CONNECTIVITY_INTERNAL); |
| |
| const int err = InterfaceController::delAddress( |
| ifName.c_str(), addrString.c_str(), prefixLength); |
| if (err != 0) { |
| return binder::Status::fromServiceSpecificError(-err, |
| String8::format("InterfaceController error: %s", strerror(-err))); |
| } |
| return binder::Status::ok(); |
| } |
| |
| binder::Status NetdNativeService::setProcSysNet( |
| int32_t family, int32_t which, const std::string &ifname, const std::string ¶meter, |
| const std::string &value) { |
| ENFORCE_PERMISSION(CONNECTIVITY_INTERNAL); |
| |
| const char *familyStr; |
| switch (family) { |
| case INetd::IPV4: |
| familyStr = "ipv4"; |
| break; |
| case INetd::IPV6: |
| familyStr = "ipv6"; |
| break; |
| default: |
| return binder::Status::fromServiceSpecificError(EAFNOSUPPORT, String8("Bad family")); |
| } |
| |
| const char *whichStr; |
| switch (which) { |
| case INetd::CONF: |
| whichStr = "conf"; |
| break; |
| case INetd::NEIGH: |
| whichStr = "neigh"; |
| break; |
| default: |
| return binder::Status::fromServiceSpecificError(EINVAL, String8("Bad category")); |
| } |
| |
| const int err = InterfaceController::setParameter( |
| familyStr, whichStr, ifname.c_str(), parameter.c_str(), |
| value.c_str()); |
| if (err != 0) { |
| return binder::Status::fromServiceSpecificError(-err, |
| String8::format("ResolverController error: %s", strerror(-err))); |
| } |
| return binder::Status::ok(); |
| } |
| |
| } // namespace net |
| } // namespace android |