| /* |
| * Copyright (C) 2008 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. |
| */ |
| |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <errno.h> |
| |
| #define LOG_TAG "Netd" |
| |
| #include <cutils/log.h> |
| |
| #include <netutils/ifc.h> |
| #include <sysutils/NetlinkEvent.h> |
| #include "NetlinkHandler.h" |
| #include "NetlinkManager.h" |
| #include "ResponseCode.h" |
| #include "SockDiag.h" |
| #include "Controllers.h" |
| |
| static const char *kUpdated = "updated"; |
| static const char *kRemoved = "removed"; |
| |
| namespace android { |
| namespace net { |
| |
| NetlinkHandler::NetlinkHandler(NetlinkManager *nm, int listenerSocket, |
| int format) : |
| NetlinkListener(listenerSocket, format) { |
| mNm = nm; |
| } |
| |
| NetlinkHandler::~NetlinkHandler() { |
| } |
| |
| int NetlinkHandler::start() { |
| return this->startListener(); |
| } |
| |
| int NetlinkHandler::stop() { |
| return this->stopListener(); |
| } |
| |
| static long parseIfIndex(const char* ifIndex) { |
| if (ifIndex == nullptr) { |
| return 0; |
| } |
| long ifaceIndex = strtol(ifIndex, NULL, 10); |
| // strtol returns 0 on error, which is fine because 0 is not a valid ifindex. |
| if (errno == ERANGE && (ifaceIndex == LONG_MAX || ifaceIndex == LONG_MIN)) { |
| return 0; |
| } |
| return ifaceIndex; |
| } |
| |
| void NetlinkHandler::onEvent(NetlinkEvent *evt) { |
| const char *subsys = evt->getSubsystem(); |
| if (!subsys) { |
| ALOGW("No subsystem found in netlink event"); |
| return; |
| } |
| |
| if (!strcmp(subsys, "net")) { |
| NetlinkEvent::Action action = evt->getAction(); |
| const char *iface = evt->findParam("INTERFACE"); |
| if ((action == NetlinkEvent::Action::kAdd) || |
| (action == NetlinkEvent::Action::kLinkUp) || |
| (action == NetlinkEvent::Action::kLinkDown)) { |
| const char *ifIndex = evt->findParam("IFINDEX"); |
| long ifaceIndex = parseIfIndex(ifIndex); |
| if (ifaceIndex) { |
| gCtls->trafficCtrl.addInterface(iface, ifaceIndex); |
| } else { |
| ALOGE("invalid interface index: %s(%s)", iface, ifIndex); |
| } |
| } |
| |
| if (action == NetlinkEvent::Action::kAdd) { |
| notifyInterfaceAdded(iface); |
| } else if (action == NetlinkEvent::Action::kRemove) { |
| notifyInterfaceRemoved(iface); |
| } else if (action == NetlinkEvent::Action::kChange) { |
| evt->dump(); |
| notifyInterfaceChanged("nana", true); |
| } else if (action == NetlinkEvent::Action::kLinkUp) { |
| notifyInterfaceLinkChanged(iface, true); |
| } else if (action == NetlinkEvent::Action::kLinkDown) { |
| notifyInterfaceLinkChanged(iface, false); |
| } else if (action == NetlinkEvent::Action::kAddressUpdated || |
| action == NetlinkEvent::Action::kAddressRemoved) { |
| const char *address = evt->findParam("ADDRESS"); |
| const char *flags = evt->findParam("FLAGS"); |
| const char *scope = evt->findParam("SCOPE"); |
| const char *ifIndex = evt->findParam("IFINDEX"); |
| char addrstr[INET6_ADDRSTRLEN + strlen("/128")]; |
| strlcpy(addrstr, address, sizeof(addrstr)); |
| char *slash = strchr(addrstr, '/'); |
| if (slash) { |
| *slash = '\0'; |
| } |
| |
| long ifaceIndex = parseIfIndex(ifIndex); |
| if (!ifaceIndex) { |
| ALOGE("invalid interface index: %s(%s)", iface, ifIndex); |
| } |
| if (action == NetlinkEvent::Action::kAddressUpdated) { |
| gCtls->netCtrl.addInterfaceAddress(ifaceIndex, address); |
| } else { // action == NetlinkEvent::Action::kAddressRemoved |
| bool shouldDestroy = gCtls->netCtrl.removeInterfaceAddress(ifaceIndex, address); |
| if (shouldDestroy) { |
| SockDiag sd; |
| if (sd.open()) { |
| int ret = sd.destroySockets(addrstr); |
| if (ret < 0) { |
| ALOGE("Error destroying sockets: %s", strerror(-ret)); |
| } |
| } else { |
| ALOGE("Error opening NETLINK_SOCK_DIAG socket: %s", strerror(errno)); |
| } |
| } |
| } |
| // Note: if this interface was deleted, iface is "" and we don't notify. |
| if (iface && iface[0] && address && flags && scope) { |
| notifyAddressChanged(action, address, iface, flags, scope); |
| } |
| } else if (action == NetlinkEvent::Action::kRdnss) { |
| const char *lifetime = evt->findParam("LIFETIME"); |
| const char *servers = evt->findParam("SERVERS"); |
| if (lifetime && servers) { |
| notifyInterfaceDnsServers(iface, lifetime, servers); |
| } |
| } else if (action == NetlinkEvent::Action::kRouteUpdated || |
| action == NetlinkEvent::Action::kRouteRemoved) { |
| const char *route = evt->findParam("ROUTE"); |
| const char *gateway = evt->findParam("GATEWAY"); |
| const char *iface = evt->findParam("INTERFACE"); |
| if (route && (gateway || iface)) { |
| notifyRouteChange(action, route, gateway, iface); |
| } |
| } |
| |
| } else if (!strcmp(subsys, "qlog") || !strcmp(subsys, "xt_quota2")) { |
| const char *alertName = evt->findParam("ALERT_NAME"); |
| const char *iface = evt->findParam("INTERFACE"); |
| notifyQuotaLimitReached(alertName, iface); |
| |
| } else if (!strcmp(subsys, "strict")) { |
| const char *uid = evt->findParam("UID"); |
| const char *hex = evt->findParam("HEX"); |
| notifyStrictCleartext(uid, hex); |
| |
| } else if (!strcmp(subsys, "xt_idletimer")) { |
| const char *label = evt->findParam("INTERFACE"); |
| const char *state = evt->findParam("STATE"); |
| const char *timestamp = evt->findParam("TIME_NS"); |
| const char *uid = evt->findParam("UID"); |
| if (state) |
| notifyInterfaceClassActivity(label, !strcmp("active", state), |
| timestamp, uid); |
| |
| #if !LOG_NDEBUG |
| } else if (strcmp(subsys, "platform") && strcmp(subsys, "backlight")) { |
| /* It is not a VSYNC or a backlight event */ |
| ALOGV("unexpected event from subsystem %s", subsys); |
| #endif |
| } |
| } |
| |
| void NetlinkHandler::notify(int code, const char *format, ...) { |
| char *msg; |
| va_list args; |
| va_start(args, format); |
| if (vasprintf(&msg, format, args) >= 0) { |
| mNm->getBroadcaster()->sendBroadcast(code, msg, false); |
| free(msg); |
| } else { |
| SLOGE("Failed to send notification: vasprintf: %s", strerror(errno)); |
| } |
| va_end(args); |
| } |
| |
| void NetlinkHandler::notifyInterfaceAdded(const char *name) { |
| notify(ResponseCode::InterfaceChange, "Iface added %s", name); |
| } |
| |
| void NetlinkHandler::notifyInterfaceRemoved(const char *name) { |
| notify(ResponseCode::InterfaceChange, "Iface removed %s", name); |
| } |
| |
| void NetlinkHandler::notifyInterfaceChanged(const char *name, bool isUp) { |
| notify(ResponseCode::InterfaceChange, |
| "Iface changed %s %s", name, (isUp ? "up" : "down")); |
| } |
| |
| void NetlinkHandler::notifyInterfaceLinkChanged(const char *name, bool isUp) { |
| notify(ResponseCode::InterfaceChange, |
| "Iface linkstate %s %s", name, (isUp ? "up" : "down")); |
| } |
| |
| void NetlinkHandler::notifyQuotaLimitReached(const char *name, const char *iface) { |
| notify(ResponseCode::BandwidthControl, "limit alert %s %s", name, iface); |
| } |
| |
| void NetlinkHandler::notifyInterfaceClassActivity(const char *name, |
| bool isActive, |
| const char *timestamp, |
| const char *uid) { |
| if (timestamp == NULL) |
| notify(ResponseCode::InterfaceClassActivity, |
| "IfaceClass %s %s", isActive ? "active" : "idle", name); |
| else if (uid != NULL && isActive) |
| notify(ResponseCode::InterfaceClassActivity, |
| "IfaceClass active %s %s %s", name, timestamp, uid); |
| else |
| notify(ResponseCode::InterfaceClassActivity, |
| "IfaceClass %s %s %s", isActive ? "active" : "idle", name, timestamp); |
| } |
| |
| void NetlinkHandler::notifyAddressChanged(NetlinkEvent::Action action, const char *addr, |
| const char *iface, const char *flags, |
| const char *scope) { |
| notify(ResponseCode::InterfaceAddressChange, |
| "Address %s %s %s %s %s", |
| (action == NetlinkEvent::Action::kAddressUpdated) ? kUpdated : kRemoved, |
| addr, iface, flags, scope); |
| } |
| |
| void NetlinkHandler::notifyInterfaceDnsServers(const char *iface, |
| const char *lifetime, |
| const char *servers) { |
| notify(ResponseCode::InterfaceDnsInfo, "DnsInfo servers %s %s %s", |
| iface, lifetime, servers); |
| } |
| |
| void NetlinkHandler::notifyRouteChange(NetlinkEvent::Action action, const char *route, |
| const char *gateway, const char *iface) { |
| notify(ResponseCode::RouteChange, |
| "Route %s %s%s%s%s%s", |
| (action == NetlinkEvent::Action::kRouteUpdated) ? kUpdated : kRemoved, |
| route, |
| (gateway && *gateway) ? " via " : "", |
| gateway, |
| (iface && *iface) ? " dev " : "", |
| iface); |
| } |
| |
| void NetlinkHandler::notifyStrictCleartext(const char* uid, const char* hex) { |
| notify(ResponseCode::StrictCleartext, "%s %s", uid, hex); |
| } |
| |
| } // namespace net |
| } // namespace android |
