1008 lines
35 KiB
C++
1008 lines
35 KiB
C++
/*
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* Copyright (C) 2011 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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// #define LOG_NDEBUG 0
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/*
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* The CommandListener, FrameworkListener don't allow for
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* multiple calls in parallel to reach the BandwidthController.
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* If they ever were to allow it, then netd/ would need some tweaking.
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.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 <string>
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#include <vector>
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#define __STDC_FORMAT_MACROS 1
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#include <inttypes.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/pkt_sched.h>
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#include "android-base/stringprintf.h"
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#include "android-base/strings.h"
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#define LOG_TAG "BandwidthController"
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#include <cutils/log.h>
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#include <cutils/properties.h>
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#include <logwrap/logwrap.h>
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#include <netdutils/Syscalls.h>
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#include "BandwidthController.h"
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#include "FirewallController.h" /* For makeCriticalCommands */
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#include "NatController.h" /* For LOCAL_TETHER_COUNTERS_CHAIN */
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#include "NetdConstants.h"
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#include "ResponseCode.h"
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/* Alphabetical */
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#define ALERT_IPT_TEMPLATE "%s %s -m quota2 ! --quota %" PRId64" --name %s\n"
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const char BandwidthController::LOCAL_INPUT[] = "bw_INPUT";
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const char BandwidthController::LOCAL_FORWARD[] = "bw_FORWARD";
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const char BandwidthController::LOCAL_OUTPUT[] = "bw_OUTPUT";
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const char BandwidthController::LOCAL_RAW_PREROUTING[] = "bw_raw_PREROUTING";
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const char BandwidthController::LOCAL_MANGLE_POSTROUTING[] = "bw_mangle_POSTROUTING";
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auto BandwidthController::iptablesRestoreFunction = execIptablesRestoreWithOutput;
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using android::base::Join;
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using android::base::StringAppendF;
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using android::base::StringPrintf;
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using android::netdutils::StatusOr;
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using android::netdutils::UniqueFile;
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namespace {
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const char ALERT_GLOBAL_NAME[] = "globalAlert";
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const int MAX_IPT_OUTPUT_LINE_LEN = 256;
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const std::string NEW_CHAIN_COMMAND = "-N ";
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const std::string GET_TETHER_STATS_COMMAND = StringPrintf(
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"*filter\n"
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"-nvx -L %s\n"
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"COMMIT\n", NatController::LOCAL_TETHER_COUNTERS_CHAIN);
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const char NAUGHTY_CHAIN[] = "bw_penalty_box";
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const char NICE_CHAIN[] = "bw_happy_box";
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/**
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* Some comments about the rules:
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* * Ordering
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* - when an interface is marked as costly it should be INSERTED into the INPUT/OUTPUT chains.
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* E.g. "-I bw_INPUT -i rmnet0 --jump costly"
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* - quota'd rules in the costly chain should be before bw_penalty_box lookups.
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* - the qtaguid counting is done at the end of the bw_INPUT/bw_OUTPUT user chains.
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*
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* * global quota vs per interface quota
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* - global quota for all costly interfaces uses a single costly chain:
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* . initial rules
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* iptables -N bw_costly_shared
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* iptables -I bw_INPUT -i iface0 --jump bw_costly_shared
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* iptables -I bw_OUTPUT -o iface0 --jump bw_costly_shared
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* iptables -I bw_costly_shared -m quota \! --quota 500000 \
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* --jump REJECT --reject-with icmp-net-prohibited
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* iptables -A bw_costly_shared --jump bw_penalty_box
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* iptables -A bw_penalty_box --jump bw_happy_box
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* iptables -A bw_happy_box --jump bw_data_saver
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*
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* . adding a new iface to this, E.g.:
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* iptables -I bw_INPUT -i iface1 --jump bw_costly_shared
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* iptables -I bw_OUTPUT -o iface1 --jump bw_costly_shared
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*
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* - quota per interface. This is achieve by having "costly" chains per quota.
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* E.g. adding a new costly interface iface0 with its own quota:
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* iptables -N bw_costly_iface0
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* iptables -I bw_INPUT -i iface0 --jump bw_costly_iface0
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* iptables -I bw_OUTPUT -o iface0 --jump bw_costly_iface0
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* iptables -A bw_costly_iface0 -m quota \! --quota 500000 \
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* --jump REJECT --reject-with icmp-port-unreachable
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* iptables -A bw_costly_iface0 --jump bw_penalty_box
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*
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* * Penalty box, happy box and data saver.
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* - bw_penalty box is a blacklist of apps that are rejected.
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* - bw_happy_box is a whitelist of apps. It always includes all system apps
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* - bw_data_saver implements data usage restrictions.
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* - Via the UI the user can add and remove apps from the whitelist and
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* blacklist, and turn on/off data saver.
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* - The blacklist takes precedence over the whitelist and the whitelist
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* takes precedence over data saver.
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*
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* * bw_penalty_box handling:
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* - only one bw_penalty_box for all interfaces
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* E.g Adding an app:
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* iptables -I bw_penalty_box -m owner --uid-owner app_3 \
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* --jump REJECT --reject-with icmp-port-unreachable
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*
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* * bw_happy_box handling:
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* - The bw_happy_box comes after the penalty box.
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* E.g Adding a happy app,
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* iptables -I bw_happy_box -m owner --uid-owner app_3 \
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* --jump RETURN
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*
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* * bw_data_saver handling:
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* - The bw_data_saver comes after the happy box.
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* Enable data saver:
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* iptables -R 1 bw_data_saver --jump REJECT --reject-with icmp-port-unreachable
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* Disable data saver:
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* iptables -R 1 bw_data_saver --jump RETURN
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*/
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const std::string COMMIT_AND_CLOSE = "COMMIT\n";
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const std::string HAPPY_BOX_WHITELIST_COMMAND = StringPrintf(
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"-I bw_happy_box -m owner --uid-owner %d-%d --jump RETURN", 0, MAX_SYSTEM_UID);
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static const std::vector<std::string> IPT_FLUSH_COMMANDS = {
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/*
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* Cleanup rules.
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* Should normally include bw_costly_<iface>, but we rely on the way they are setup
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* to allow coexistance.
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*/
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"*filter",
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":bw_INPUT -",
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":bw_OUTPUT -",
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":bw_FORWARD -",
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":bw_happy_box -",
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":bw_penalty_box -",
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":bw_data_saver -",
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":bw_costly_shared -",
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"COMMIT",
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"*raw",
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":bw_raw_PREROUTING -",
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"COMMIT",
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"*mangle",
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":bw_mangle_POSTROUTING -",
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COMMIT_AND_CLOSE
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};
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static const std::vector<std::string> IPT_BASIC_ACCOUNTING_COMMANDS = {
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"*filter",
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"-A bw_INPUT -m owner --socket-exists", /* This is a tracking rule. */
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"-A bw_OUTPUT -m owner --socket-exists", /* This is a tracking rule. */
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"-A bw_costly_shared --jump bw_penalty_box",
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"-A bw_penalty_box --jump bw_happy_box",
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"-A bw_happy_box --jump bw_data_saver",
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"-A bw_data_saver -j RETURN",
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HAPPY_BOX_WHITELIST_COMMAND,
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"COMMIT",
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"*raw",
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"-A bw_raw_PREROUTING -m owner --socket-exists", /* This is a tracking rule. */
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"COMMIT",
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"*mangle",
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"-A bw_mangle_POSTROUTING -m owner --socket-exists", /* This is a tracking rule. */
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COMMIT_AND_CLOSE
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};
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std::vector<std::string> toStrVec(int num, char* strs[]) {
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std::vector<std::string> tmp;
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for (int i = 0; i < num; ++i) {
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tmp.emplace_back(strs[i]);
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}
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return tmp;
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}
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} // namespace
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BandwidthController::BandwidthController() {
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}
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void BandwidthController::flushCleanTables(bool doClean) {
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/* Flush and remove the bw_costly_<iface> tables */
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flushExistingCostlyTables(doClean);
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std::string commands = Join(IPT_FLUSH_COMMANDS, '\n');
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iptablesRestoreFunction(V4V6, commands, nullptr);
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}
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int BandwidthController::setupIptablesHooks() {
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/* flush+clean is allowed to fail */
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flushCleanTables(true);
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return 0;
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}
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int BandwidthController::enableBandwidthControl(bool force) {
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char value[PROPERTY_VALUE_MAX];
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if (!force) {
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property_get("persist.bandwidth.enable", value, "1");
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if (!strcmp(value, "0"))
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return 0;
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}
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/* Let's pretend we started from scratch ... */
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mSharedQuotaIfaces.clear();
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mQuotaIfaces.clear();
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mGlobalAlertBytes = 0;
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mGlobalAlertTetherCount = 0;
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mSharedQuotaBytes = mSharedAlertBytes = 0;
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flushCleanTables(false);
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std::string commands = Join(IPT_BASIC_ACCOUNTING_COMMANDS, '\n');
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return iptablesRestoreFunction(V4V6, commands, nullptr);
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}
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int BandwidthController::disableBandwidthControl() {
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flushCleanTables(false);
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return 0;
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}
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std::string BandwidthController::makeDataSaverCommand(IptablesTarget target, bool enable) {
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std::string cmd;
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const char *chainName = "bw_data_saver";
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const char *op = jumpToString(enable ? IptJumpReject : IptJumpReturn);
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std::string criticalCommands = enable ?
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FirewallController::makeCriticalCommands(target, chainName) : "";
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StringAppendF(&cmd,
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"*filter\n"
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":%s -\n"
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"%s"
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"-A %s%s\n"
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"COMMIT\n", chainName, criticalCommands.c_str(), chainName, op);
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return cmd;
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}
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int BandwidthController::enableDataSaver(bool enable) {
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int ret = iptablesRestoreFunction(V4, makeDataSaverCommand(V4, enable), nullptr);
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ret |= iptablesRestoreFunction(V6, makeDataSaverCommand(V6, enable), nullptr);
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return ret;
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}
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int BandwidthController::addNaughtyApps(int numUids, char *appUids[]) {
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return manipulateSpecialApps(toStrVec(numUids, appUids), NAUGHTY_CHAIN,
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IptJumpReject, IptOpInsert);
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}
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int BandwidthController::removeNaughtyApps(int numUids, char *appUids[]) {
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return manipulateSpecialApps(toStrVec(numUids, appUids), NAUGHTY_CHAIN,
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IptJumpReject, IptOpDelete);
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}
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int BandwidthController::addNiceApps(int numUids, char *appUids[]) {
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return manipulateSpecialApps(toStrVec(numUids, appUids), NICE_CHAIN,
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IptJumpReturn, IptOpInsert);
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}
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int BandwidthController::removeNiceApps(int numUids, char *appUids[]) {
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return manipulateSpecialApps(toStrVec(numUids, appUids), NICE_CHAIN,
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IptJumpReturn, IptOpDelete);
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}
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int BandwidthController::manipulateSpecialApps(const std::vector<std::string>& appStrUids,
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const std::string& chain, IptJumpOp jumpHandling,
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IptOp op) {
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std::string cmd = "*filter\n";
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for (const auto& appStrUid : appStrUids) {
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StringAppendF(&cmd, "%s %s -m owner --uid-owner %s%s\n", opToString(op), chain.c_str(),
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appStrUid.c_str(), jumpToString(jumpHandling));
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}
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StringAppendF(&cmd, "COMMIT\n");
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return iptablesRestoreFunction(V4V6, cmd, nullptr);
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}
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int BandwidthController::setInterfaceSharedQuota(const std::string& iface, int64_t maxBytes) {
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int res = 0;
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std::string quotaCmd;
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constexpr char cost[] = "shared";
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constexpr char chain[] = "bw_costly_shared";
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if (!maxBytes) {
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/* Don't talk about -1, deprecate it. */
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ALOGE("Invalid bytes value. 1..max_int64.");
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return -1;
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}
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if (!isIfaceName(iface))
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return -1;
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if (maxBytes == -1) {
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return removeInterfaceSharedQuota(iface);
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}
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auto it = mSharedQuotaIfaces.find(iface);
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if (it == mSharedQuotaIfaces.end()) {
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const int ruleInsertPos = (mGlobalAlertBytes) ? 2 : 1;
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std::vector<std::string> cmds = {
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"*filter",
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StringPrintf("-I bw_INPUT %d -i %s --jump %s", ruleInsertPos, iface.c_str(), chain),
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StringPrintf("-I bw_OUTPUT %d -o %s --jump %s", ruleInsertPos, iface.c_str(), chain),
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StringPrintf("-A bw_FORWARD -o %s --jump %s", iface.c_str(), chain),
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};
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if (mSharedQuotaIfaces.empty()) {
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cmds.push_back(StringPrintf("-I %s -m quota2 ! --quota %" PRId64
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" --name %s --jump REJECT",
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chain, maxBytes, cost));
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}
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cmds.push_back("COMMIT\n");
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res |= iptablesRestoreFunction(V4V6, Join(cmds, "\n"), nullptr);
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if (res) {
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ALOGE("Failed set quota rule");
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removeInterfaceSharedQuota(iface);
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return -1;
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}
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mSharedQuotaBytes = maxBytes;
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mSharedQuotaIfaces.insert(iface);
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}
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if (maxBytes != mSharedQuotaBytes) {
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res |= updateQuota(cost, maxBytes);
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if (res) {
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ALOGE("Failed update quota for %s", cost);
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removeInterfaceSharedQuota(iface);
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return -1;
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}
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mSharedQuotaBytes = maxBytes;
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}
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return 0;
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}
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/* It will also cleanup any shared alerts */
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int BandwidthController::removeInterfaceSharedQuota(const std::string& iface) {
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constexpr char cost[] = "shared";
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constexpr char chain[] = "bw_costly_shared";
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if (!isIfaceName(iface))
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return -1;
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auto it = mSharedQuotaIfaces.find(iface);
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if (it == mSharedQuotaIfaces.end()) {
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ALOGE("No such iface %s to delete", iface.c_str());
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return -1;
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}
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std::vector<std::string> cmds = {
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"*filter",
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StringPrintf("-D bw_INPUT -i %s --jump %s", iface.c_str(), chain),
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StringPrintf("-D bw_OUTPUT -o %s --jump %s", iface.c_str(), chain),
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StringPrintf("-D bw_FORWARD -o %s --jump %s", iface.c_str(), chain),
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};
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if (mSharedQuotaIfaces.size() == 1) {
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cmds.push_back(StringPrintf("-D %s -m quota2 ! --quota %" PRIu64
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" --name %s --jump REJECT",
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chain, mSharedQuotaBytes, cost));
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}
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cmds.push_back("COMMIT\n");
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if (iptablesRestoreFunction(V4V6, Join(cmds, "\n"), nullptr) != 0) {
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ALOGE("Failed to remove shared quota on %s", iface.c_str());
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return -1;
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}
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int res = 0;
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mSharedQuotaIfaces.erase(it);
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if (mSharedQuotaIfaces.empty()) {
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mSharedQuotaBytes = 0;
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if (mSharedAlertBytes) {
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res = removeSharedAlert();
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if (res == 0) {
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mSharedAlertBytes = 0;
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}
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}
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}
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return res;
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}
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int BandwidthController::setInterfaceQuota(const std::string& iface, int64_t maxBytes) {
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const std::string& cost = iface;
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if (!isIfaceName(iface))
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return -1;
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if (!maxBytes) {
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/* Don't talk about -1, deprecate it. */
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ALOGE("Invalid bytes value. 1..max_int64.");
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return -1;
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}
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if (maxBytes == -1) {
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return removeInterfaceQuota(iface);
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}
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/* Insert ingress quota. */
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auto it = mQuotaIfaces.find(iface);
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if (it != mQuotaIfaces.end()) {
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if (updateQuota(cost, maxBytes) != 0) {
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ALOGE("Failed update quota for %s", iface.c_str());
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removeInterfaceQuota(iface);
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return -1;
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}
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it->second.quota = maxBytes;
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return 0;
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}
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const std::string chain = "bw_costly_" + iface;
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const int ruleInsertPos = (mGlobalAlertBytes) ? 2 : 1;
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std::vector<std::string> cmds = {
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"*filter",
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StringPrintf(":%s -", chain.c_str()),
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StringPrintf("-A %s -j bw_penalty_box", chain.c_str()),
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StringPrintf("-I bw_INPUT %d -i %s --jump %s", ruleInsertPos, iface.c_str(),
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chain.c_str()),
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StringPrintf("-I bw_OUTPUT %d -o %s --jump %s", ruleInsertPos, iface.c_str(),
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chain.c_str()),
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StringPrintf("-A bw_FORWARD -o %s --jump %s", iface.c_str(), chain.c_str()),
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StringPrintf("-A %s -m quota2 ! --quota %" PRId64 " --name %s --jump REJECT",
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chain.c_str(), maxBytes, cost.c_str()),
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"COMMIT\n",
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};
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if (iptablesRestoreFunction(V4V6, Join(cmds, "\n"), nullptr) != 0) {
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ALOGE("Failed set quota rule");
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removeInterfaceQuota(iface);
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return -1;
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}
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mQuotaIfaces[iface] = QuotaInfo{maxBytes, 0};
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return 0;
|
|
}
|
|
|
|
int BandwidthController::getInterfaceSharedQuota(int64_t *bytes) {
|
|
return getInterfaceQuota("shared", bytes);
|
|
}
|
|
|
|
int BandwidthController::getInterfaceQuota(const std::string& iface, int64_t* bytes) {
|
|
const auto& sys = android::netdutils::sSyscalls.get();
|
|
const std::string fname = "/proc/net/xt_quota/" + iface;
|
|
|
|
if (!isIfaceName(iface)) return -1;
|
|
|
|
StatusOr<UniqueFile> file = sys.fopen(fname, "re");
|
|
if (!isOk(file)) {
|
|
ALOGE("Reading quota %s failed (%s)", iface.c_str(), toString(file).c_str());
|
|
return -1;
|
|
}
|
|
auto rv = sys.fscanf(file.value().get(), "%" SCNd64, bytes);
|
|
if (!isOk(rv)) {
|
|
ALOGE("Reading quota %s failed (%s)", iface.c_str(), toString(rv).c_str());
|
|
return -1;
|
|
}
|
|
ALOGV("Read quota res=%d bytes=%" PRId64, rv.value(), *bytes);
|
|
return rv.value() == 1 ? 0 : -1;
|
|
}
|
|
|
|
int BandwidthController::removeInterfaceQuota(const std::string& iface) {
|
|
if (!isIfaceName(iface))
|
|
return -1;
|
|
|
|
auto it = mQuotaIfaces.find(iface);
|
|
|
|
if (it == mQuotaIfaces.end()) {
|
|
ALOGE("No such iface %s to delete", iface.c_str());
|
|
return -1;
|
|
}
|
|
|
|
const std::string chain = "bw_costly_" + iface;
|
|
std::vector<std::string> cmds = {
|
|
"*filter",
|
|
StringPrintf("-D bw_INPUT -i %s --jump %s", iface.c_str(), chain.c_str()),
|
|
StringPrintf("-D bw_OUTPUT -o %s --jump %s", iface.c_str(), chain.c_str()),
|
|
StringPrintf("-D bw_FORWARD -o %s --jump %s", iface.c_str(), chain.c_str()),
|
|
StringPrintf("-F %s", chain.c_str()),
|
|
StringPrintf("-X %s", chain.c_str()),
|
|
"COMMIT\n",
|
|
};
|
|
|
|
const int res = iptablesRestoreFunction(V4V6, Join(cmds, "\n"), nullptr);
|
|
|
|
if (res == 0) {
|
|
mQuotaIfaces.erase(it);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
int BandwidthController::updateQuota(const std::string& quotaName, int64_t bytes) {
|
|
const auto& sys = android::netdutils::sSyscalls.get();
|
|
const std::string fname = "/proc/net/xt_quota/" + quotaName;
|
|
|
|
if (!isIfaceName(quotaName)) {
|
|
ALOGE("updateQuota: Invalid quotaName \"%s\"", quotaName.c_str());
|
|
return -1;
|
|
}
|
|
|
|
StatusOr<UniqueFile> file = sys.fopen(fname, "we");
|
|
if (!isOk(file)) {
|
|
ALOGE("Updating quota %s failed (%s)", quotaName.c_str(), toString(file).c_str());
|
|
return -1;
|
|
}
|
|
sys.fprintf(file.value().get(), "%" PRId64 "\n", bytes);
|
|
return 0;
|
|
}
|
|
|
|
int BandwidthController::runIptablesAlertCmd(IptOp op, const std::string& alertName,
|
|
int64_t bytes) {
|
|
const char *opFlag = opToString(op);
|
|
std::string alertQuotaCmd = "*filter\n";
|
|
|
|
// TODO: consider using an alternate template for the delete that does not include the --quota
|
|
// value. This code works because the --quota value is ignored by deletes
|
|
StringAppendF(&alertQuotaCmd, ALERT_IPT_TEMPLATE, opFlag, "bw_INPUT", bytes,
|
|
alertName.c_str());
|
|
StringAppendF(&alertQuotaCmd, ALERT_IPT_TEMPLATE, opFlag, "bw_OUTPUT", bytes,
|
|
alertName.c_str());
|
|
StringAppendF(&alertQuotaCmd, "COMMIT\n");
|
|
|
|
return iptablesRestoreFunction(V4V6, alertQuotaCmd, nullptr);
|
|
}
|
|
|
|
int BandwidthController::runIptablesAlertFwdCmd(IptOp op, const std::string& alertName,
|
|
int64_t bytes) {
|
|
const char *opFlag = opToString(op);
|
|
std::string alertQuotaCmd = "*filter\n";
|
|
StringAppendF(&alertQuotaCmd, ALERT_IPT_TEMPLATE, opFlag, "bw_FORWARD", bytes,
|
|
alertName.c_str());
|
|
StringAppendF(&alertQuotaCmd, "COMMIT\n");
|
|
|
|
return iptablesRestoreFunction(V4V6, alertQuotaCmd, nullptr);
|
|
}
|
|
|
|
int BandwidthController::setGlobalAlert(int64_t bytes) {
|
|
const char *alertName = ALERT_GLOBAL_NAME;
|
|
int res = 0;
|
|
|
|
if (!bytes) {
|
|
ALOGE("Invalid bytes value. 1..max_int64.");
|
|
return -1;
|
|
}
|
|
if (mGlobalAlertBytes) {
|
|
res = updateQuota(alertName, bytes);
|
|
} else {
|
|
res = runIptablesAlertCmd(IptOpInsert, alertName, bytes);
|
|
if (mGlobalAlertTetherCount) {
|
|
ALOGV("setGlobalAlert for %d tether", mGlobalAlertTetherCount);
|
|
res |= runIptablesAlertFwdCmd(IptOpInsert, alertName, bytes);
|
|
}
|
|
}
|
|
mGlobalAlertBytes = bytes;
|
|
return res;
|
|
}
|
|
|
|
int BandwidthController::setGlobalAlertInForwardChain() {
|
|
const char *alertName = ALERT_GLOBAL_NAME;
|
|
int res = 0;
|
|
|
|
mGlobalAlertTetherCount++;
|
|
ALOGV("setGlobalAlertInForwardChain(): %d tether", mGlobalAlertTetherCount);
|
|
|
|
/*
|
|
* If there is no globalAlert active we are done.
|
|
* If there is an active globalAlert but this is not the 1st
|
|
* tether, we are also done.
|
|
*/
|
|
if (!mGlobalAlertBytes || mGlobalAlertTetherCount != 1) {
|
|
return 0;
|
|
}
|
|
|
|
/* We only add the rule if this was the 1st tether added. */
|
|
res = runIptablesAlertFwdCmd(IptOpInsert, alertName, mGlobalAlertBytes);
|
|
return res;
|
|
}
|
|
|
|
int BandwidthController::removeGlobalAlert() {
|
|
|
|
const char *alertName = ALERT_GLOBAL_NAME;
|
|
int res = 0;
|
|
|
|
if (!mGlobalAlertBytes) {
|
|
ALOGE("No prior alert set");
|
|
return -1;
|
|
}
|
|
res = runIptablesAlertCmd(IptOpDelete, alertName, mGlobalAlertBytes);
|
|
if (mGlobalAlertTetherCount) {
|
|
res |= runIptablesAlertFwdCmd(IptOpDelete, alertName, mGlobalAlertBytes);
|
|
}
|
|
mGlobalAlertBytes = 0;
|
|
return res;
|
|
}
|
|
|
|
int BandwidthController::removeGlobalAlertInForwardChain() {
|
|
int res = 0;
|
|
const char *alertName = ALERT_GLOBAL_NAME;
|
|
|
|
if (!mGlobalAlertTetherCount) {
|
|
ALOGE("No prior alert set");
|
|
return -1;
|
|
}
|
|
|
|
mGlobalAlertTetherCount--;
|
|
/*
|
|
* If there is no globalAlert active we are done.
|
|
* If there is an active globalAlert but there are more
|
|
* tethers, we are also done.
|
|
*/
|
|
if (!mGlobalAlertBytes || mGlobalAlertTetherCount >= 1) {
|
|
return 0;
|
|
}
|
|
|
|
/* We only detete the rule if this was the last tether removed. */
|
|
res = runIptablesAlertFwdCmd(IptOpDelete, alertName, mGlobalAlertBytes);
|
|
return res;
|
|
}
|
|
|
|
int BandwidthController::setSharedAlert(int64_t bytes) {
|
|
if (!mSharedQuotaBytes) {
|
|
ALOGE("Need to have a prior shared quota set to set an alert");
|
|
return -1;
|
|
}
|
|
if (!bytes) {
|
|
ALOGE("Invalid bytes value. 1..max_int64.");
|
|
return -1;
|
|
}
|
|
return setCostlyAlert("shared", bytes, &mSharedAlertBytes);
|
|
}
|
|
|
|
int BandwidthController::removeSharedAlert() {
|
|
return removeCostlyAlert("shared", &mSharedAlertBytes);
|
|
}
|
|
|
|
int BandwidthController::setInterfaceAlert(const std::string& iface, int64_t bytes) {
|
|
if (!isIfaceName(iface)) {
|
|
ALOGE("setInterfaceAlert: Invalid iface \"%s\"", iface.c_str());
|
|
return -1;
|
|
}
|
|
|
|
if (!bytes) {
|
|
ALOGE("Invalid bytes value. 1..max_int64.");
|
|
return -1;
|
|
}
|
|
auto it = mQuotaIfaces.find(iface);
|
|
|
|
if (it == mQuotaIfaces.end()) {
|
|
ALOGE("Need to have a prior interface quota set to set an alert");
|
|
return -1;
|
|
}
|
|
|
|
return setCostlyAlert(iface, bytes, &it->second.alert);
|
|
}
|
|
|
|
int BandwidthController::removeInterfaceAlert(const std::string& iface) {
|
|
if (!isIfaceName(iface)) {
|
|
ALOGE("removeInterfaceAlert: Invalid iface \"%s\"", iface.c_str());
|
|
return -1;
|
|
}
|
|
|
|
auto it = mQuotaIfaces.find(iface);
|
|
|
|
if (it == mQuotaIfaces.end()) {
|
|
ALOGE("No prior alert set for interface %s", iface.c_str());
|
|
return -1;
|
|
}
|
|
|
|
return removeCostlyAlert(iface, &it->second.alert);
|
|
}
|
|
|
|
int BandwidthController::setCostlyAlert(const std::string& costName, int64_t bytes,
|
|
int64_t* alertBytes) {
|
|
int res = 0;
|
|
|
|
if (!isIfaceName(costName)) {
|
|
ALOGE("setCostlyAlert: Invalid costName \"%s\"", costName.c_str());
|
|
return -1;
|
|
}
|
|
|
|
if (!bytes) {
|
|
ALOGE("Invalid bytes value. 1..max_int64.");
|
|
return -1;
|
|
}
|
|
|
|
std::string alertName = costName + "Alert";
|
|
std::string chainName = "bw_costly_" + costName;
|
|
if (*alertBytes) {
|
|
res = updateQuota(alertName, *alertBytes);
|
|
} else {
|
|
std::vector<std::string> commands = {
|
|
"*filter\n",
|
|
StringPrintf(ALERT_IPT_TEMPLATE, "-A", chainName.c_str(), bytes, alertName.c_str()),
|
|
"COMMIT\n"
|
|
};
|
|
res = iptablesRestoreFunction(V4V6, Join(commands, ""), nullptr);
|
|
if (res) {
|
|
ALOGE("Failed to set costly alert for %s", costName.c_str());
|
|
}
|
|
}
|
|
if (res == 0) {
|
|
*alertBytes = bytes;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
int BandwidthController::removeCostlyAlert(const std::string& costName, int64_t* alertBytes) {
|
|
if (!isIfaceName(costName)) {
|
|
ALOGE("removeCostlyAlert: Invalid costName \"%s\"", costName.c_str());
|
|
return -1;
|
|
}
|
|
|
|
if (!*alertBytes) {
|
|
ALOGE("No prior alert set for %s alert", costName.c_str());
|
|
return -1;
|
|
}
|
|
|
|
std::string alertName = costName + "Alert";
|
|
std::string chainName = "bw_costly_" + costName;
|
|
std::vector<std::string> commands = {
|
|
"*filter\n",
|
|
StringPrintf(ALERT_IPT_TEMPLATE, "-D", chainName.c_str(), *alertBytes, alertName.c_str()),
|
|
"COMMIT\n"
|
|
};
|
|
if (iptablesRestoreFunction(V4V6, Join(commands, ""), nullptr) != 0) {
|
|
ALOGE("Failed to remove costly alert %s", costName.c_str());
|
|
return -1;
|
|
}
|
|
|
|
*alertBytes = 0;
|
|
return 0;
|
|
}
|
|
|
|
void BandwidthController::addStats(TetherStatsList& statsList, const TetherStats& stats) {
|
|
for (TetherStats& existing : statsList) {
|
|
if (existing.addStatsIfMatch(stats)) {
|
|
return;
|
|
}
|
|
}
|
|
// No match. Insert a new interface pair.
|
|
statsList.push_back(stats);
|
|
}
|
|
|
|
/*
|
|
* Parse the ptks and bytes out of:
|
|
* Chain natctrl_tether_counters (4 references)
|
|
* pkts bytes target prot opt in out source destination
|
|
* 26 2373 RETURN all -- wlan0 rmnet0 0.0.0.0/0 0.0.0.0/0
|
|
* 27 2002 RETURN all -- rmnet0 wlan0 0.0.0.0/0 0.0.0.0/0
|
|
* 1040 107471 RETURN all -- bt-pan rmnet0 0.0.0.0/0 0.0.0.0/0
|
|
* 1450 1708806 RETURN all -- rmnet0 bt-pan 0.0.0.0/0 0.0.0.0/0
|
|
* or:
|
|
* Chain natctrl_tether_counters (0 references)
|
|
* pkts bytes target prot opt in out source destination
|
|
* 0 0 RETURN all wlan0 rmnet_data0 ::/0 ::/0
|
|
* 0 0 RETURN all rmnet_data0 wlan0 ::/0 ::/0
|
|
*
|
|
* It results in an error if invoked and no tethering counter rules exist. The constraint
|
|
* helps detect complete parsing failure.
|
|
*/
|
|
int BandwidthController::addForwardChainStats(const TetherStats& filter,
|
|
TetherStatsList& statsList,
|
|
const std::string& statsOutput,
|
|
std::string &extraProcessingInfo) {
|
|
int res;
|
|
std::string statsLine;
|
|
char iface0[MAX_IPT_OUTPUT_LINE_LEN];
|
|
char iface1[MAX_IPT_OUTPUT_LINE_LEN];
|
|
char rest[MAX_IPT_OUTPUT_LINE_LEN];
|
|
|
|
TetherStats stats;
|
|
const char *buffPtr;
|
|
int64_t packets, bytes;
|
|
int statsFound = 0;
|
|
|
|
bool filterPair = filter.intIface[0] && filter.extIface[0];
|
|
|
|
ALOGV("filter: %s", filter.getStatsLine().c_str());
|
|
|
|
stats = filter;
|
|
|
|
std::stringstream stream(statsOutput);
|
|
while (std::getline(stream, statsLine, '\n')) {
|
|
buffPtr = statsLine.c_str();
|
|
|
|
/* Clean up, so a failed parse can still print info */
|
|
iface0[0] = iface1[0] = rest[0] = packets = bytes = 0;
|
|
if (strstr(buffPtr, "0.0.0.0")) {
|
|
// IPv4 has -- indicating what to do with fragments...
|
|
// 26 2373 RETURN all -- wlan0 rmnet0 0.0.0.0/0 0.0.0.0/0
|
|
res = sscanf(buffPtr, "%" SCNd64" %" SCNd64" RETURN all -- %s %s 0.%s",
|
|
&packets, &bytes, iface0, iface1, rest);
|
|
} else {
|
|
// ... but IPv6 does not.
|
|
// 26 2373 RETURN all wlan0 rmnet0 ::/0 ::/0
|
|
res = sscanf(buffPtr, "%" SCNd64" %" SCNd64" RETURN all %s %s ::/%s",
|
|
&packets, &bytes, iface0, iface1, rest);
|
|
}
|
|
ALOGV("parse res=%d iface0=<%s> iface1=<%s> pkts=%" PRId64" bytes=%" PRId64" rest=<%s> orig line=<%s>", res,
|
|
iface0, iface1, packets, bytes, rest, buffPtr);
|
|
extraProcessingInfo += buffPtr;
|
|
extraProcessingInfo += "\n";
|
|
|
|
if (res != 5) {
|
|
continue;
|
|
}
|
|
/*
|
|
* The following assumes that the 1st rule has in:extIface out:intIface,
|
|
* which is what NatController sets up.
|
|
* If not filtering, the 1st match rx, and sets up the pair for the tx side.
|
|
*/
|
|
if (filter.intIface[0] && filter.extIface[0]) {
|
|
if (filter.intIface == iface0 && filter.extIface == iface1) {
|
|
ALOGV("2Filter RX iface_in=%s iface_out=%s rx_bytes=%" PRId64" rx_packets=%" PRId64" ", iface0, iface1, bytes, packets);
|
|
stats.rxPackets = packets;
|
|
stats.rxBytes = bytes;
|
|
} else if (filter.intIface == iface1 && filter.extIface == iface0) {
|
|
ALOGV("2Filter TX iface_in=%s iface_out=%s rx_bytes=%" PRId64" rx_packets=%" PRId64" ", iface0, iface1, bytes, packets);
|
|
stats.txPackets = packets;
|
|
stats.txBytes = bytes;
|
|
}
|
|
} else if (filter.intIface[0] || filter.extIface[0]) {
|
|
if (filter.intIface == iface0 || filter.extIface == iface1) {
|
|
ALOGV("1Filter RX iface_in=%s iface_out=%s rx_bytes=%" PRId64" rx_packets=%" PRId64" ", iface0, iface1, bytes, packets);
|
|
stats.intIface = iface0;
|
|
stats.extIface = iface1;
|
|
stats.rxPackets = packets;
|
|
stats.rxBytes = bytes;
|
|
} else if (filter.intIface == iface1 || filter.extIface == iface0) {
|
|
ALOGV("1Filter TX iface_in=%s iface_out=%s rx_bytes=%" PRId64" rx_packets=%" PRId64" ", iface0, iface1, bytes, packets);
|
|
stats.intIface = iface1;
|
|
stats.extIface = iface0;
|
|
stats.txPackets = packets;
|
|
stats.txBytes = bytes;
|
|
}
|
|
} else /* if (!filter.intFace[0] && !filter.extIface[0]) */ {
|
|
if (!stats.intIface[0]) {
|
|
ALOGV("0Filter RX iface_in=%s iface_out=%s rx_bytes=%" PRId64" rx_packets=%" PRId64" ", iface0, iface1, bytes, packets);
|
|
stats.intIface = iface0;
|
|
stats.extIface = iface1;
|
|
stats.rxPackets = packets;
|
|
stats.rxBytes = bytes;
|
|
} else if (stats.intIface == iface1 && stats.extIface == iface0) {
|
|
ALOGV("0Filter TX iface_in=%s iface_out=%s rx_bytes=%" PRId64" rx_packets=%" PRId64" ", iface0, iface1, bytes, packets);
|
|
stats.txPackets = packets;
|
|
stats.txBytes = bytes;
|
|
}
|
|
}
|
|
if (stats.rxBytes != -1 && stats.txBytes != -1) {
|
|
ALOGV("rx_bytes=%" PRId64" tx_bytes=%" PRId64" filterPair=%d", stats.rxBytes, stats.txBytes, filterPair);
|
|
addStats(statsList, stats);
|
|
if (filterPair) {
|
|
return 0;
|
|
} else {
|
|
statsFound++;
|
|
stats = filter;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* It is always an error to find only one side of the stats. */
|
|
/* It is an error to find nothing when not filtering. */
|
|
if (((stats.rxBytes == -1) != (stats.txBytes == -1)) ||
|
|
(!statsFound && !filterPair)) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
std::string BandwidthController::TetherStats::getStatsLine() const {
|
|
std::string msg;
|
|
StringAppendF(&msg, "%s %s %" PRId64" %" PRId64" %" PRId64" %" PRId64, intIface.c_str(),
|
|
extIface.c_str(), rxBytes, rxPackets, txBytes, txPackets);
|
|
return msg;
|
|
}
|
|
|
|
int BandwidthController::getTetherStats(SocketClient *cli, TetherStats& filter,
|
|
std::string &extraProcessingInfo) {
|
|
int res = 0;
|
|
|
|
TetherStatsList statsList;
|
|
|
|
for (const IptablesTarget target : {V4, V6}) {
|
|
std::string statsString;
|
|
res = iptablesRestoreFunction(target, GET_TETHER_STATS_COMMAND, &statsString);
|
|
if (res != 0) {
|
|
ALOGE("Failed to run %s err=%d", GET_TETHER_STATS_COMMAND.c_str(), res);
|
|
return -1;
|
|
}
|
|
|
|
res = addForwardChainStats(filter, statsList, statsString, extraProcessingInfo);
|
|
if (res != 0) {
|
|
return res;
|
|
}
|
|
}
|
|
|
|
if (filter.intIface[0] && filter.extIface[0] && statsList.size() == 1) {
|
|
cli->sendMsg(ResponseCode::TetheringStatsResult,
|
|
statsList[0].getStatsLine().c_str(), false);
|
|
} else {
|
|
for (const auto& stats: statsList) {
|
|
cli->sendMsg(ResponseCode::TetheringStatsListResult,
|
|
stats.getStatsLine().c_str(), false);
|
|
}
|
|
if (res == 0) {
|
|
cli->sendMsg(ResponseCode::CommandOkay, "Tethering stats list completed", false);
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
void BandwidthController::flushExistingCostlyTables(bool doClean) {
|
|
std::string fullCmd = "*filter\n-S\nCOMMIT\n";
|
|
std::string ruleList;
|
|
|
|
/* Only lookup ip4 table names as ip6 will have the same tables ... */
|
|
if (int ret = iptablesRestoreFunction(V4, fullCmd, &ruleList)) {
|
|
ALOGE("Failed to list existing costly tables ret=%d", ret);
|
|
return;
|
|
}
|
|
/* ... then flush/clean both ip4 and ip6 iptables. */
|
|
parseAndFlushCostlyTables(ruleList, doClean);
|
|
}
|
|
|
|
void BandwidthController::parseAndFlushCostlyTables(const std::string& ruleList, bool doRemove) {
|
|
std::stringstream stream(ruleList);
|
|
std::string rule;
|
|
std::vector<std::string> clearCommands = { "*filter" };
|
|
std::string chainName;
|
|
|
|
// Find and flush all rules starting with "-N bw_costly_<iface>" except "-N bw_costly_shared".
|
|
while (std::getline(stream, rule, '\n')) {
|
|
if (rule.find(NEW_CHAIN_COMMAND) != 0) continue;
|
|
chainName = rule.substr(NEW_CHAIN_COMMAND.size());
|
|
ALOGV("parse chainName=<%s> orig line=<%s>", chainName.c_str(), rule.c_str());
|
|
|
|
if (chainName.find("bw_costly_") != 0 || chainName == std::string("bw_costly_shared")) {
|
|
continue;
|
|
}
|
|
|
|
clearCommands.push_back(StringPrintf(":%s -", chainName.c_str()));
|
|
if (doRemove) {
|
|
clearCommands.push_back(StringPrintf("-X %s", chainName.c_str()));
|
|
}
|
|
}
|
|
|
|
if (clearCommands.size() == 1) {
|
|
// No rules found.
|
|
return;
|
|
}
|
|
|
|
clearCommands.push_back("COMMIT\n");
|
|
iptablesRestoreFunction(V4V6, Join(clearCommands, '\n'), nullptr);
|
|
}
|
|
|
|
inline const char *BandwidthController::opToString(IptOp op) {
|
|
switch (op) {
|
|
case IptOpInsert:
|
|
return "-I";
|
|
case IptOpDelete:
|
|
return "-D";
|
|
}
|
|
}
|
|
|
|
inline const char *BandwidthController::jumpToString(IptJumpOp jumpHandling) {
|
|
/*
|
|
* Must be careful what one rejects with, as upper layer protocols will just
|
|
* keep on hammering the device until the number of retries are done.
|
|
* For port-unreachable (default), TCP should consider as an abort (RFC1122).
|
|
*/
|
|
switch (jumpHandling) {
|
|
case IptJumpNoAdd:
|
|
return "";
|
|
case IptJumpReject:
|
|
return " --jump REJECT";
|
|
case IptJumpReturn:
|
|
return " --jump RETURN";
|
|
}
|
|
}
|