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286 lines
12 KiB
286 lines
12 KiB
/* |
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* Copyright (C) 2008 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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#include <stdarg.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 <errno.h> |
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#define LOG_TAG "Netd" |
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#include <log/log.h> |
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#include <android-base/parseint.h> |
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#include <android-base/strings.h> |
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#include <netutils/ifc.h> |
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#include <sysutils/NetlinkEvent.h> |
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#include "Controllers.h" |
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#include "NetlinkHandler.h" |
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#include "NetlinkManager.h" |
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#include "SockDiag.h" |
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#include <charconv> |
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#define BINDER_RETRY(exp) \ |
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({ \ |
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bool res = true; \ |
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for (int attempt = 0; /*nop*/; ++attempt) { \ |
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auto _rc = (exp); \ |
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if (_rc.exceptionCode() == binder::Status::EX_TRANSACTION_FAILED && \ |
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attempt < RETRY_ATTEMPTS) { \ |
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usleep(RETRY_INTERVAL_MICRO_S); \ |
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} else { \ |
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res = _rc.isOk(); \ |
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break; \ |
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} \ |
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} \ |
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res; \ |
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}) |
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#define LOG_EVENT_FUNC(retry, func, ...) \ |
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do { \ |
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const auto listenerMap = gCtls->eventReporter.getNetdUnsolicitedEventListenerMap(); \ |
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for (auto& listener : listenerMap) { \ |
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auto entry = gUnsolicitedLog.newEntry().function(#func).args(__VA_ARGS__); \ |
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if (retry(listener.first->func(__VA_ARGS__))) { \ |
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gUnsolicitedLog.log(entry.withAutomaticDuration()); \ |
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} \ |
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} \ |
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} while (0) |
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namespace android { |
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namespace net { |
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constexpr int RETRY_ATTEMPTS = 2; |
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constexpr int RETRY_INTERVAL_MICRO_S = 100000; |
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NetlinkHandler::NetlinkHandler(NetlinkManager *nm, int listenerSocket, |
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int format) : |
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NetlinkListener(listenerSocket, format) { |
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mNm = nm; |
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} |
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NetlinkHandler::~NetlinkHandler() { |
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} |
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int NetlinkHandler::start() { |
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return this->startListener(); |
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} |
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int NetlinkHandler::stop() { |
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return this->stopListener(); |
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} |
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static long parseIfIndex(const char* ifIndex) { |
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if (ifIndex == nullptr) { |
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return 0; |
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} |
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long ifaceIndex = strtol(ifIndex, nullptr, 10); |
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// strtol returns 0 on error, which is fine because 0 is not a valid ifindex. |
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if (errno == ERANGE && (ifaceIndex == LONG_MAX || ifaceIndex == LONG_MIN)) { |
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return 0; |
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} |
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return ifaceIndex; |
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} |
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void NetlinkHandler::onEvent(NetlinkEvent *evt) { |
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const char *subsys = evt->getSubsystem(); |
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if (!subsys) { |
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ALOGW("No subsystem found in netlink event"); |
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return; |
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} |
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if (!strcmp(subsys, "net")) { |
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NetlinkEvent::Action action = evt->getAction(); |
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const char *iface = evt->findParam("INTERFACE"); |
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if ((action == NetlinkEvent::Action::kAdd) || |
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(action == NetlinkEvent::Action::kLinkUp) || |
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(action == NetlinkEvent::Action::kLinkDown)) { |
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const char *ifIndex = evt->findParam("IFINDEX"); |
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long ifaceIndex = parseIfIndex(ifIndex); |
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if (ifaceIndex) { |
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gCtls->trafficCtrl.addInterface(iface, ifaceIndex); |
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} else { |
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ALOGE("invalid interface index: %s(%s)", iface, ifIndex); |
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} |
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} |
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if (action == NetlinkEvent::Action::kAdd) { |
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notifyInterfaceAdded(iface); |
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} else if (action == NetlinkEvent::Action::kRemove) { |
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notifyInterfaceRemoved(iface); |
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} else if (action == NetlinkEvent::Action::kChange) { |
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evt->dump(); |
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notifyInterfaceChanged("nana", true); |
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} else if (action == NetlinkEvent::Action::kLinkUp) { |
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notifyInterfaceLinkChanged(iface, true); |
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} else if (action == NetlinkEvent::Action::kLinkDown) { |
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notifyInterfaceLinkChanged(iface, false); |
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} else if (action == NetlinkEvent::Action::kAddressUpdated || |
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action == NetlinkEvent::Action::kAddressRemoved) { |
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const char *address = evt->findParam("ADDRESS"); |
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const char *flags = evt->findParam("FLAGS"); |
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const char *scope = evt->findParam("SCOPE"); |
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const char *ifIndex = evt->findParam("IFINDEX"); |
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char addrstr[INET6_ADDRSTRLEN + strlen("/128")]; |
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strlcpy(addrstr, address, sizeof(addrstr)); |
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char *slash = strchr(addrstr, '/'); |
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if (slash) { |
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*slash = '\0'; |
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} |
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long ifaceIndex = parseIfIndex(ifIndex); |
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if (!ifaceIndex) { |
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ALOGE("invalid interface index: %s(%s)", iface, ifIndex); |
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} |
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const bool addrUpdated = (action == NetlinkEvent::Action::kAddressUpdated); |
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if (addrUpdated) { |
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gCtls->netCtrl.addInterfaceAddress(ifaceIndex, address); |
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} else { // action == NetlinkEvent::Action::kAddressRemoved |
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bool shouldDestroy = gCtls->netCtrl.removeInterfaceAddress(ifaceIndex, address); |
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if (shouldDestroy) { |
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SockDiag sd; |
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if (sd.open()) { |
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int ret = sd.destroySockets(addrstr); |
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if (ret < 0) { |
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ALOGE("Error destroying sockets: %s", strerror(-ret)); |
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} |
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} else { |
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ALOGE("Error opening NETLINK_SOCK_DIAG socket: %s", strerror(errno)); |
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} |
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} |
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} |
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// Note: if this interface was deleted, iface is "" and we don't notify. |
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if (iface && iface[0] && address && flags && scope) { |
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if (addrUpdated) { |
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notifyAddressUpdated(address, iface, std::stoi(flags), std::stoi(scope)); |
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} else { |
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notifyAddressRemoved(address, iface, std::stoi(flags), std::stoi(scope)); |
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} |
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} |
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} else if (action == NetlinkEvent::Action::kRdnss) { |
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const char *lifetime = evt->findParam("LIFETIME"); |
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const char *servers = evt->findParam("SERVERS"); |
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if (lifetime && servers) { |
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notifyInterfaceDnsServers(iface, strtol(lifetime, nullptr, 10), |
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android::base::Split(servers, ",")); |
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} |
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} else if (action == NetlinkEvent::Action::kRouteUpdated || |
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action == NetlinkEvent::Action::kRouteRemoved) { |
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const char *route = evt->findParam("ROUTE"); |
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const char *gateway = evt->findParam("GATEWAY"); |
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const char *iface = evt->findParam("INTERFACE"); |
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if (route && (gateway || iface)) { |
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notifyRouteChange((action == NetlinkEvent::Action::kRouteUpdated) ? true : false, |
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route, (gateway == nullptr) ? "" : gateway, |
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(iface == nullptr) ? "" : iface); |
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} |
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} |
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} else if (!strcmp(subsys, "qlog") || !strcmp(subsys, "xt_quota2")) { |
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const char *alertName = evt->findParam("ALERT_NAME"); |
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const char *iface = evt->findParam("INTERFACE"); |
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if (alertName && iface) { |
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notifyQuotaLimitReached(alertName, iface); |
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} |
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} else if (!strcmp(subsys, "strict")) { |
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const char *uid = evt->findParam("UID"); |
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const char *hex = evt->findParam("HEX"); |
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if (uid && hex) { |
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notifyStrictCleartext(strtol(uid, nullptr, 10), hex); |
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} |
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} else if (!strcmp(subsys, "xt_idletimer")) { |
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const char *label = evt->findParam("INTERFACE"); |
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const char *state = evt->findParam("STATE"); |
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const char *timestamp = evt->findParam("TIME_NS"); |
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const char *uid = evt->findParam("UID"); |
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if (state) { |
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bool isActive = !strcmp("active", state); |
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int64_t processTimestamp = (timestamp == nullptr) ? 0 : strtoll(timestamp, nullptr, 10); |
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int intLabel; |
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// NMS only accepts interface class activity changes with integer labels, and only ever |
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// creates idletimers with integer labels. |
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if (android::base::ParseInt(label, &intLabel)) { |
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const long reportedUid = |
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(uid != nullptr && isActive) ? strtol(uid, nullptr, 10) : -1; |
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notifyInterfaceClassActivityChanged(intLabel, isActive, processTimestamp, |
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reportedUid); |
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} |
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} |
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#if !LOG_NDEBUG |
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} else if (strcmp(subsys, "platform") && strcmp(subsys, "backlight")) { |
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/* It is not a VSYNC or a backlight event */ |
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ALOGV("unexpected event from subsystem %s", subsys); |
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#endif |
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} |
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} |
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void NetlinkHandler::notifyInterfaceAdded(const std::string& ifName) { |
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LOG_EVENT_FUNC(BINDER_RETRY, onInterfaceAdded, ifName); |
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} |
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void NetlinkHandler::notifyInterfaceRemoved(const std::string& ifName) { |
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LOG_EVENT_FUNC(BINDER_RETRY, onInterfaceRemoved, ifName); |
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} |
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void NetlinkHandler::notifyInterfaceChanged(const std::string& ifName, bool up) { |
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LOG_EVENT_FUNC(BINDER_RETRY, onInterfaceChanged, ifName, up); |
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} |
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void NetlinkHandler::notifyInterfaceLinkChanged(const std::string& ifName, bool up) { |
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LOG_EVENT_FUNC(BINDER_RETRY, onInterfaceLinkStateChanged, ifName, up); |
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} |
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void NetlinkHandler::notifyQuotaLimitReached(const std::string& labelName, |
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const std::string& ifName) { |
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LOG_EVENT_FUNC(BINDER_RETRY, onQuotaLimitReached, labelName, ifName); |
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} |
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void NetlinkHandler::notifyInterfaceClassActivityChanged(int label, bool isActive, |
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int64_t timestamp, int uid) { |
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LOG_EVENT_FUNC(BINDER_RETRY, onInterfaceClassActivityChanged, isActive, label, timestamp, uid); |
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} |
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void NetlinkHandler::notifyAddressUpdated(const std::string& addr, const std::string& ifName, |
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int flags, int scope) { |
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LOG_EVENT_FUNC(BINDER_RETRY, onInterfaceAddressUpdated, addr, ifName, flags, scope); |
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} |
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void NetlinkHandler::notifyAddressRemoved(const std::string& addr, const std::string& ifName, |
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int flags, int scope) { |
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LOG_EVENT_FUNC(BINDER_RETRY, onInterfaceAddressRemoved, addr, ifName, flags, scope); |
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} |
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void NetlinkHandler::notifyInterfaceDnsServers(const std::string& ifName, int64_t lifetime, |
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const std::vector<std::string>& servers) { |
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LOG_EVENT_FUNC(BINDER_RETRY, onInterfaceDnsServerInfo, ifName, lifetime, servers); |
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} |
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void NetlinkHandler::notifyRouteChange(bool updated, const std::string& route, |
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const std::string& gateway, const std::string& ifName) { |
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LOG_EVENT_FUNC(BINDER_RETRY, onRouteChanged, updated, route, gateway, ifName); |
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} |
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void NetlinkHandler::notifyStrictCleartext(uid_t uid, const std::string& hex) { |
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LOG_EVENT_FUNC(BINDER_RETRY, onStrictCleartextDetected, uid, hex); |
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} |
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} // namespace net |
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} // namespace android
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