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1349 lines
54 KiB
1349 lines
54 KiB
/*
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* Copyright (C) 2014 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 "RouteController.h"
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#include <arpa/inet.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/fib_rules.h>
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#include <net/if.h>
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#include <sys/stat.h>
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#include <private/android_filesystem_config.h>
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#include <map>
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#include "DummyNetwork.h"
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#include "Fwmark.h"
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#include "NetdConstants.h"
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#include "NetlinkCommands.h"
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#include "OffloadUtils.h"
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#include <android-base/file.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#include "log/log.h"
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#include "netid_client.h"
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#include "netutils/ifc.h"
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using android::base::StartsWith;
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using android::base::StringPrintf;
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using android::base::WriteStringToFile;
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using android::net::UidRangeParcel;
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namespace android::net {
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auto RouteController::iptablesRestoreCommandFunction = execIptablesRestoreCommand;
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// BEGIN CONSTANTS --------------------------------------------------------------------------------
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const uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97;
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const uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98;
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const uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99;
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const char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network";
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const char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network";
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const char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system";
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const char* const ROUTE_TABLE_NAME_LOCAL = "local";
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const char* const ROUTE_TABLE_NAME_MAIN = "main";
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// None of our regular routes specify priority, which causes them to have the default priority.
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// For default throw routes, we use a fixed priority of 100000.
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uint32_t PRIO_THROW = 100000;
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const char* const RouteController::LOCAL_MANGLE_INPUT = "routectrl_mangle_INPUT";
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const uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6};
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const uid_t UID_ROOT = 0;
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const uint32_t FWMARK_NONE = 0;
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const uint32_t MASK_NONE = 0;
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const char* const IIF_LOOPBACK = "lo";
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const char* const IIF_NONE = nullptr;
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const char* const OIF_NONE = nullptr;
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const bool ACTION_ADD = true;
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const bool ACTION_DEL = false;
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const bool MODIFY_NON_UID_BASED_RULES = true;
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const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables";
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const mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r--
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// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'"
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// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t).
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static constexpr uint16_t U16_RTA_LENGTH(uint16_t x) {
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return RTA_LENGTH(x);
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}
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// These are practically const, but can't be declared so, because they are used to initialize
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// non-const pointers ("void* iov_base") in iovec arrays.
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rtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY };
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rtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE };
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rtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK };
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rtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK };
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rtattr FRATTR_UID_RANGE = { U16_RTA_LENGTH(sizeof(fib_rule_uid_range)), FRA_UID_RANGE };
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rtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE };
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rtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF };
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rtattr RTATTR_PRIO = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_PRIORITY };
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// One or more nested attributes in the RTA_METRICS attribute.
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rtattr RTATTRX_MTU = { U16_RTA_LENGTH(sizeof(uint32_t)), RTAX_MTU};
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constexpr size_t RTATTRX_MTU_SIZE = RTA_SPACE(sizeof(uint32_t));
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// The RTA_METRICS attribute itself.
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constexpr size_t RTATTR_METRICS_SIZE = RTATTRX_MTU_SIZE;
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rtattr RTATTR_METRICS = { U16_RTA_LENGTH(RTATTR_METRICS_SIZE), RTA_METRICS };
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uint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0};
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constexpr bool EXPLICIT = true;
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constexpr bool IMPLICIT = false;
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// END CONSTANTS ----------------------------------------------------------------------------------
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static const char* actionName(uint16_t action) {
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static const char *ops[4] = {"adding", "deleting", "getting", "???"};
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return ops[action % 4];
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}
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static const char* familyName(uint8_t family) {
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switch (family) {
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case AF_INET: return "IPv4";
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case AF_INET6: return "IPv6";
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default: return "???";
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}
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}
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static void maybeModifyQdiscClsact(const char* interface, bool add);
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// Caller must hold sInterfaceToTableLock.
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uint32_t RouteController::getRouteTableForInterfaceLocked(const char* interface) {
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// If we already know the routing table for this interface name, use it.
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// This ensures we can remove rules and routes for an interface that has been removed,
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// or has been removed and re-added with a different interface index.
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//
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// The caller is responsible for ensuring that an interface is never added to a network
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// until it has been removed from any network it was previously in. This ensures that
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// if the same interface disconnects and then reconnects with a different interface ID
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// when the reconnect happens the interface will not be in the map, and the code will
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// determine the new routing table from the interface ID, below.
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auto iter = sInterfaceToTable.find(interface);
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if (iter != sInterfaceToTable.end()) {
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return iter->second;
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}
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uint32_t index = if_nametoindex(interface);
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if (index == 0) {
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ALOGE("cannot find interface %s: %s", interface, strerror(errno));
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return RT_TABLE_UNSPEC;
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}
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index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX;
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sInterfaceToTable[interface] = index;
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return index;
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}
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uint32_t RouteController::getIfIndex(const char* interface) {
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std::lock_guard lock(sInterfaceToTableLock);
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auto iter = sInterfaceToTable.find(interface);
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if (iter == sInterfaceToTable.end()) {
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ALOGE("getIfIndex: cannot find interface %s", interface);
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return 0;
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}
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// For interfaces that are not in the local network, the routing table is always the interface
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// index plus ROUTE_TABLE_OFFSET_FROM_INDEX. But for interfaces in the local network, there's no
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// way to know the interface index from this table. Return 0 here so callers of this method do
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// not get confused.
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// TODO: stop calling this method from any caller that only wants interfaces in client mode.
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int ifindex = iter->second;
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if (ifindex == ROUTE_TABLE_LOCAL_NETWORK) {
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return 0;
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}
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return ifindex - ROUTE_TABLE_OFFSET_FROM_INDEX;
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}
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uint32_t RouteController::getRouteTableForInterface(const char* interface) {
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std::lock_guard lock(sInterfaceToTableLock);
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return getRouteTableForInterfaceLocked(interface);
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}
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void addTableName(uint32_t table, const std::string& name, std::string* contents) {
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char tableString[UINT32_STRLEN];
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snprintf(tableString, sizeof(tableString), "%u", table);
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*contents += tableString;
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*contents += " ";
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*contents += name;
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*contents += "\n";
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}
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// Doesn't return success/failure as the file is optional; it's okay if we fail to update it.
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void RouteController::updateTableNamesFile() {
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std::string contents;
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addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents);
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addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents);
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addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents);
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addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents);
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addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents);
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std::lock_guard lock(sInterfaceToTableLock);
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for (const auto& entry : sInterfaceToTable) {
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addTableName(entry.second, entry.first, &contents);
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}
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if (!WriteStringToFile(contents, RT_TABLES_PATH, RT_TABLES_MODE, AID_SYSTEM, AID_WIFI)) {
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ALOGE("failed to write to %s (%s)", RT_TABLES_PATH, strerror(errno));
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return;
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}
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}
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// Returns 0 on success or negative errno on failure.
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int padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) {
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if (!input) {
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*length = 0;
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*padding = 0;
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return 0;
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}
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*length = strlcpy(name, input, IFNAMSIZ) + 1;
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if (*length > IFNAMSIZ) {
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ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ);
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return -ENAMETOOLONG;
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}
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*padding = RTA_SPACE(*length) - RTA_LENGTH(*length);
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return 0;
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}
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// Adds or removes a routing rule for IPv4 and IPv6.
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//
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// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the table is
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// unspecified. An unspecified table is not allowed when creating an FR_ACT_TO_TBL rule.
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// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is
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// ignored.
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// + If |iif| is non-NULL, the rule matches the specified incoming interface.
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// + If |oif| is non-NULL, the rule matches the specified outgoing interface.
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// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that
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// range (inclusive). Otherwise, the rule matches packets from all UIDs.
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//
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// Returns 0 on success or negative errno on failure.
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[[nodiscard]] static int modifyIpRule(uint16_t action, uint32_t priority, uint8_t ruleType,
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uint32_t table, uint32_t fwmark, uint32_t mask,
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const char* iif, const char* oif, uid_t uidStart,
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uid_t uidEnd) {
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// Ensure that if you set a bit in the fwmark, it's not being ignored by the mask.
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if (fwmark & ~mask) {
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ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark);
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return -ERANGE;
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}
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// Interface names must include exactly one terminating NULL and be properly padded, or older
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// kernels will refuse to delete rules.
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char iifName[IFNAMSIZ], oifName[IFNAMSIZ];
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size_t iifLength, oifLength;
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uint16_t iifPadding, oifPadding;
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if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) {
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return ret;
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}
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if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) {
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return ret;
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}
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// Either both start and end UID must be specified, or neither.
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if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) {
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ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd);
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return -EUSERS;
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}
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bool isUidRule = (uidStart != INVALID_UID);
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// Assemble a rule request and put it in an array of iovec structures.
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fib_rule_hdr rule = {
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.action = ruleType,
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// Note that here we're implicitly setting rule.table to 0. When we want to specify a
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// non-zero table, we do this via the FRATTR_TABLE attribute.
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};
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// Don't ever create a rule that looks up table 0, because table 0 is the local table.
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// It's OK to specify a table ID of 0 when deleting a rule, because that doesn't actually select
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// table 0, it's a wildcard that matches anything.
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if (table == RT_TABLE_UNSPEC && rule.action == FR_ACT_TO_TBL && action != RTM_DELRULE) {
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ALOGE("RT_TABLE_UNSPEC only allowed when deleting rules");
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return -ENOTUNIQ;
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}
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rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME };
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rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME };
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struct fib_rule_uid_range uidRange = { uidStart, uidEnd };
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iovec iov[] = {
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{ nullptr, 0 },
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{ &rule, sizeof(rule) },
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{ &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) },
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{ &priority, sizeof(priority) },
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{ &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 },
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{ &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 },
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{ &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 },
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{ &fwmark, mask ? sizeof(fwmark) : 0 },
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{ &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 },
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{ &mask, mask ? sizeof(mask) : 0 },
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{ &FRATTR_UID_RANGE, isUidRule ? sizeof(FRATTR_UID_RANGE) : 0 },
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{ &uidRange, isUidRule ? sizeof(uidRange) : 0 },
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{ &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 },
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{ iifName, iifLength },
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{ PADDING_BUFFER, iifPadding },
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{ &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 },
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{ oifName, oifLength },
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{ PADDING_BUFFER, oifPadding },
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};
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uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_RULE_CREATE_FLAGS : NETLINK_REQUEST_FLAGS;
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for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) {
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rule.family = AF_FAMILIES[i];
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if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov), nullptr)) {
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if (!(action == RTM_DELRULE && ret == -ENOENT && priority == RULE_PRIORITY_TETHERING)) {
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// Don't log when deleting a tethering rule that's not there. This matches the
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// behaviour of clearTetheringRules, which ignores ENOENT in this case.
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ALOGE("Error %s %s rule: %s", actionName(action), familyName(rule.family),
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strerror(-ret));
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}
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return ret;
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}
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}
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return 0;
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}
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[[nodiscard]] static int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table,
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uint32_t fwmark, uint32_t mask, const char* iif,
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const char* oif, uid_t uidStart, uid_t uidEnd) {
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return modifyIpRule(action, priority, FR_ACT_TO_TBL, table, fwmark, mask, iif, oif, uidStart,
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uidEnd);
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}
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[[nodiscard]] static int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table,
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uint32_t fwmark, uint32_t mask) {
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return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID,
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INVALID_UID);
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}
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// Adds or deletes an IPv4 or IPv6 route.
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// Returns 0 on success or negative errno on failure.
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int modifyIpRoute(uint16_t action, uint16_t flags, uint32_t table, const char* interface,
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const char* destination, const char* nexthop, uint32_t mtu) {
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// At least the destination must be non-null.
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if (!destination) {
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ALOGE("null destination");
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return -EFAULT;
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}
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// Parse the prefix.
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uint8_t rawAddress[sizeof(in6_addr)];
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uint8_t family;
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uint8_t prefixLength;
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int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress),
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&prefixLength);
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if (rawLength < 0) {
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ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength));
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return rawLength;
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}
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if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) {
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ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress));
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return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6.
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}
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uint8_t type = RTN_UNICAST;
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uint32_t ifindex;
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uint8_t rawNexthop[sizeof(in6_addr)];
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if (nexthop && !strcmp(nexthop, "unreachable")) {
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type = RTN_UNREACHABLE;
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// 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup
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// the table number. But it's an error to specify an interface ("dev ...") or a nexthop for
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// unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.)
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interface = OIF_NONE;
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nexthop = nullptr;
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} else if (nexthop && !strcmp(nexthop, "throw")) {
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type = RTN_THROW;
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interface = OIF_NONE;
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nexthop = nullptr;
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} else {
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// If an interface was specified, find the ifindex.
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if (interface != OIF_NONE) {
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ifindex = if_nametoindex(interface);
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if (!ifindex) {
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ALOGE("cannot find interface %s", interface);
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return -ENODEV;
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}
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}
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// If a nexthop was specified, parse it as the same family as the prefix.
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if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) {
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ALOGE("inet_pton failed for nexthop %s", nexthop);
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return -EINVAL;
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}
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}
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bool isDefaultThrowRoute = (type == RTN_THROW && prefixLength == 0);
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// Assemble a rtmsg and put it in an array of iovec structures.
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rtmsg route = {
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.rtm_family = family,
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.rtm_dst_len = prefixLength,
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.rtm_protocol = RTPROT_STATIC,
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.rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK),
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.rtm_type = type,
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};
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rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST };
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rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY };
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iovec iov[] = {
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{ nullptr, 0 },
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{ &route, sizeof(route) },
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{ &RTATTR_TABLE, sizeof(RTATTR_TABLE) },
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{ &table, sizeof(table) },
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{ &rtaDst, sizeof(rtaDst) },
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|
{ rawAddress, static_cast<size_t>(rawLength) },
|
|
{ &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 },
|
|
{ &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 },
|
|
{ &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 },
|
|
{ rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 },
|
|
{ &RTATTR_METRICS, mtu != 0 ? sizeof(RTATTR_METRICS) : 0 },
|
|
{ &RTATTRX_MTU, mtu != 0 ? sizeof(RTATTRX_MTU) : 0 },
|
|
{ &mtu, mtu != 0 ? sizeof(mtu) : 0 },
|
|
{ &RTATTR_PRIO, isDefaultThrowRoute ? sizeof(RTATTR_PRIO) : 0 },
|
|
{ &PRIO_THROW, isDefaultThrowRoute ? sizeof(PRIO_THROW) : 0 },
|
|
};
|
|
|
|
// Allow creating multiple link-local routes in the same table, so we can make IPv6
|
|
// work on all interfaces in the local_network table.
|
|
if (family == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(reinterpret_cast<in6_addr*>(rawAddress))) {
|
|
flags &= ~NLM_F_EXCL;
|
|
}
|
|
|
|
int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov), nullptr);
|
|
if (ret) {
|
|
ALOGE("Error %s route %s -> %s %s to table %u: %s",
|
|
actionName(action), destination, nexthop, interface, table, strerror(-ret));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
// An iptables rule to mark incoming packets on a network with the netId of the network.
|
|
//
|
|
// This is so that the kernel can:
|
|
// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping
|
|
// replies, SYN-ACKs, etc).
|
|
// + Mark sockets that accept connections from this interface so that the connection stays on the
|
|
// same interface.
|
|
int modifyIncomingPacketMark(unsigned netId, const char* interface, Permission permission,
|
|
bool add) {
|
|
Fwmark fwmark;
|
|
|
|
fwmark.netId = netId;
|
|
fwmark.explicitlySelected = true;
|
|
fwmark.protectedFromVpn = true;
|
|
fwmark.permission = permission;
|
|
|
|
const uint32_t mask = ~Fwmark::getUidBillingMask();
|
|
|
|
std::string cmd = StringPrintf(
|
|
"%s %s -i %s -j MARK --set-mark 0x%x/0x%x", add ? "-A" : "-D",
|
|
RouteController::LOCAL_MANGLE_INPUT, interface, fwmark.intValue, mask);
|
|
if (RouteController::iptablesRestoreCommandFunction(V4V6, "mangle", cmd, nullptr) != 0) {
|
|
ALOGE("failed to change iptables rule that sets incoming packet mark");
|
|
return -EREMOTEIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// A rule to route responses to the local network forwarded via the VPN.
|
|
//
|
|
// When a VPN is in effect, packets from the local network to upstream networks are forwarded into
|
|
// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel.
|
|
[[nodiscard]] static int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) {
|
|
return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL,
|
|
ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE,
|
|
INVALID_UID, INVALID_UID);
|
|
}
|
|
|
|
// A rule to route all traffic from a given set of UIDs to go over the VPN.
|
|
//
|
|
// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may
|
|
// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to
|
|
// bypass the VPN if the protectedFromVpn bit is set.
|
|
[[nodiscard]] static int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd,
|
|
uint32_t subPriority, bool secure, bool add) {
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.protectedFromVpn = false;
|
|
mask.protectedFromVpn = true;
|
|
|
|
uint32_t priority;
|
|
|
|
if (secure) {
|
|
priority = RULE_PRIORITY_SECURE_VPN;
|
|
} else {
|
|
priority = RULE_PRIORITY_BYPASSABLE_VPN;
|
|
|
|
fwmark.explicitlySelected = false;
|
|
mask.explicitlySelected = true;
|
|
}
|
|
|
|
return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority + subPriority, table,
|
|
fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd);
|
|
}
|
|
|
|
// A rule to allow system apps to send traffic over this VPN even if they are not part of the target
|
|
// set of UIDs.
|
|
//
|
|
// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the
|
|
// target set, but where the DnsProxyListener itself is not.
|
|
[[nodiscard]] static int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure,
|
|
bool add) {
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.netId = netId;
|
|
mask.netId = FWMARK_NET_ID_MASK;
|
|
|
|
fwmark.permission = PERMISSION_SYSTEM;
|
|
mask.permission = PERMISSION_SYSTEM;
|
|
|
|
uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN;
|
|
|
|
return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue,
|
|
mask.intValue);
|
|
}
|
|
|
|
// A rule to route traffic based on an explicitly chosen network.
|
|
//
|
|
// Supports apps that use the multinetwork APIs to restrict their traffic to a network.
|
|
//
|
|
// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need
|
|
// to check it again in the rules here, because a network's permissions may have been updated via
|
|
// modifyNetworkPermission().
|
|
[[nodiscard]] static int modifyExplicitNetworkRule(unsigned netId, uint32_t table,
|
|
Permission permission, uid_t uidStart,
|
|
uid_t uidEnd, uint32_t subPriority, bool add) {
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.netId = netId;
|
|
mask.netId = FWMARK_NET_ID_MASK;
|
|
|
|
fwmark.explicitlySelected = true;
|
|
mask.explicitlySelected = true;
|
|
|
|
fwmark.permission = permission;
|
|
mask.permission = permission;
|
|
|
|
return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE,
|
|
RULE_PRIORITY_EXPLICIT_NETWORK + subPriority, table, fwmark.intValue,
|
|
mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd);
|
|
}
|
|
|
|
// A rule to route traffic based on a chosen outgoing interface.
|
|
//
|
|
// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows
|
|
// the outgoing interface (typically for link-local communications).
|
|
[[nodiscard]] static int modifyOutputInterfaceRules(const char* interface, uint32_t table,
|
|
Permission permission, uid_t uidStart,
|
|
uid_t uidEnd, uint32_t subPriority, bool add) {
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.permission = permission;
|
|
mask.permission = permission;
|
|
|
|
// If this rule does not specify a UID range, then also add a corresponding high-priority rule
|
|
// for root. This covers kernel-originated packets, TEEd packets and any local daemons that open
|
|
// sockets as root.
|
|
if (uidStart == INVALID_UID && uidEnd == INVALID_UID) {
|
|
if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OVERRIDE_OIF,
|
|
table, FWMARK_NONE, MASK_NONE, IIF_LOOPBACK, interface,
|
|
UID_ROOT, UID_ROOT)) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE,
|
|
RULE_PRIORITY_OUTPUT_INTERFACE + subPriority, table, fwmark.intValue,
|
|
mask.intValue, IIF_LOOPBACK, interface, uidStart, uidEnd);
|
|
}
|
|
|
|
// A rule to route traffic based on the chosen network.
|
|
//
|
|
// This is for sockets that have not explicitly requested a particular network, but have been
|
|
// bound to one when they called connect(). This ensures that sockets connected on a particular
|
|
// network stay on that network even if the default network changes.
|
|
[[nodiscard]] static int modifyImplicitNetworkRule(unsigned netId, uint32_t table, bool add) {
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.netId = netId;
|
|
mask.netId = FWMARK_NET_ID_MASK;
|
|
|
|
fwmark.explicitlySelected = false;
|
|
mask.explicitlySelected = true;
|
|
|
|
fwmark.permission = PERMISSION_NONE;
|
|
mask.permission = PERMISSION_NONE;
|
|
|
|
return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table,
|
|
fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, INVALID_UID,
|
|
INVALID_UID);
|
|
}
|
|
|
|
// A rule to enable split tunnel VPNs.
|
|
//
|
|
// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to
|
|
// go over the default network, provided it has the permissions required by the default network.
|
|
int RouteController::modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId,
|
|
const char* physicalInterface,
|
|
Permission permission) {
|
|
uint32_t table = getRouteTableForInterface(physicalInterface);
|
|
if (table == RT_TABLE_UNSPEC) {
|
|
return -ESRCH;
|
|
}
|
|
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.netId = vpnNetId;
|
|
mask.netId = FWMARK_NET_ID_MASK;
|
|
|
|
fwmark.permission = permission;
|
|
mask.permission = permission;
|
|
|
|
return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue,
|
|
mask.intValue);
|
|
}
|
|
|
|
// Add rules to allow legacy routes added through the requestRouteToHost() API.
|
|
[[nodiscard]] static int addLegacyRouteRules() {
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.explicitlySelected = false;
|
|
mask.explicitlySelected = true;
|
|
|
|
// Rules to allow legacy routes to override the default network.
|
|
if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM,
|
|
fwmark.intValue, mask.intValue)) {
|
|
return ret;
|
|
}
|
|
if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK,
|
|
ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) {
|
|
return ret;
|
|
}
|
|
|
|
fwmark.permission = PERMISSION_SYSTEM;
|
|
mask.permission = PERMISSION_SYSTEM;
|
|
|
|
// A rule to allow legacy routes from system apps to override VPNs.
|
|
return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM,
|
|
fwmark.intValue, mask.intValue);
|
|
}
|
|
|
|
// Add rules to lookup the local network when specified explicitly or otherwise.
|
|
[[nodiscard]] static int addLocalNetworkRules(unsigned localNetId) {
|
|
if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE,
|
|
INVALID_UID, INVALID_UID,
|
|
UidRanges::DEFAULT_SUB_PRIORITY, ACTION_ADD)) {
|
|
return ret;
|
|
}
|
|
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.explicitlySelected = false;
|
|
mask.explicitlySelected = true;
|
|
|
|
return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK,
|
|
fwmark.intValue, mask.intValue);
|
|
}
|
|
|
|
/* static */
|
|
int RouteController::configureDummyNetwork() {
|
|
const char *interface = DummyNetwork::INTERFACE_NAME;
|
|
uint32_t table = getRouteTableForInterface(interface);
|
|
if (table == RT_TABLE_UNSPEC) {
|
|
// getRouteTableForInterface has already logged an error.
|
|
return -ESRCH;
|
|
}
|
|
|
|
ifc_init();
|
|
int ret = ifc_up(interface);
|
|
ifc_close();
|
|
if (ret) {
|
|
ALOGE("Can't bring up %s: %s", interface, strerror(errno));
|
|
return -errno;
|
|
}
|
|
|
|
if ((ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, INVALID_UID,
|
|
INVALID_UID, UidRanges::DEFAULT_SUB_PRIORITY,
|
|
ACTION_ADD))) {
|
|
ALOGE("Can't create oif rules for %s: %s", interface, strerror(-ret));
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = modifyIpRoute(RTM_NEWROUTE, NETLINK_ROUTE_CREATE_FLAGS, table, interface,
|
|
"0.0.0.0/0", nullptr, 0 /* mtu */))) {
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = modifyIpRoute(RTM_NEWROUTE, NETLINK_ROUTE_CREATE_FLAGS, table, interface, "::/0",
|
|
nullptr, 0 /* mtu */))) {
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that
|
|
// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended
|
|
// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable
|
|
// rule will hopefully make things even clearer.
|
|
[[nodiscard]] static int addUnreachableRule() {
|
|
return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, FR_ACT_UNREACHABLE, RT_TABLE_UNSPEC,
|
|
MARK_UNSET, MARK_UNSET, IIF_NONE, OIF_NONE, INVALID_UID, INVALID_UID);
|
|
}
|
|
|
|
[[nodiscard]] static int modifyLocalNetwork(unsigned netId, const char* interface, bool add) {
|
|
if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) {
|
|
return ret;
|
|
}
|
|
maybeModifyQdiscClsact(interface, add);
|
|
return modifyOutputInterfaceRules(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE,
|
|
INVALID_UID, INVALID_UID, UidRanges::DEFAULT_SUB_PRIORITY,
|
|
add);
|
|
}
|
|
|
|
[[nodiscard]] static int modifyUidNetworkRule(unsigned netId, uint32_t table, uid_t uidStart,
|
|
uid_t uidEnd, uint32_t subPriority, bool add,
|
|
bool explicitSelect) {
|
|
if ((uidStart == INVALID_UID) || (uidEnd == INVALID_UID)) {
|
|
ALOGE("modifyUidNetworkRule, invalid UIDs (%u, %u)", uidStart, uidEnd);
|
|
return -EUSERS;
|
|
}
|
|
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.netId = netId;
|
|
mask.netId = FWMARK_NET_ID_MASK;
|
|
|
|
fwmark.explicitlySelected = explicitSelect;
|
|
mask.explicitlySelected = true;
|
|
|
|
// Access to this network is controlled by UID rules, not permission bits.
|
|
fwmark.permission = PERMISSION_NONE;
|
|
mask.permission = PERMISSION_NONE;
|
|
|
|
return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE,
|
|
explicitSelect ? (RULE_PRIORITY_UID_EXPLICIT_NETWORK + subPriority)
|
|
: (RULE_PRIORITY_UID_IMPLICIT_NETWORK + subPriority),
|
|
table, fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart,
|
|
uidEnd);
|
|
}
|
|
|
|
[[nodiscard]] static int modifyUidDefaultNetworkRule(uint32_t table, uid_t uidStart, uid_t uidEnd,
|
|
uint32_t subPriority, bool add) {
|
|
if ((uidStart == INVALID_UID) || (uidEnd == INVALID_UID)) {
|
|
ALOGE("modifyUidDefaultNetworkRule, invalid UIDs (%u, %u)", uidStart, uidEnd);
|
|
return -EUSERS;
|
|
}
|
|
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.netId = NETID_UNSET;
|
|
mask.netId = FWMARK_NET_ID_MASK;
|
|
|
|
// Access to this network is controlled by UID rules, not permission bits.
|
|
fwmark.permission = PERMISSION_NONE;
|
|
mask.permission = PERMISSION_NONE;
|
|
|
|
return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE,
|
|
RULE_PRIORITY_UID_DEFAULT_NETWORK + subPriority, table, fwmark.intValue,
|
|
mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd);
|
|
}
|
|
|
|
/* static */
|
|
int RouteController::modifyPhysicalNetwork(unsigned netId, const char* interface,
|
|
const UidRangeMap& uidRangeMap, Permission permission,
|
|
bool add, bool modifyNonUidBasedRules) {
|
|
uint32_t table = getRouteTableForInterface(interface);
|
|
if (table == RT_TABLE_UNSPEC) {
|
|
return -ESRCH;
|
|
}
|
|
|
|
for (const auto& [subPriority, uidRanges] : uidRangeMap) {
|
|
for (const UidRangeParcel& range : uidRanges.getRanges()) {
|
|
if (int ret = modifyUidNetworkRule(netId, table, range.start, range.stop, subPriority,
|
|
add, EXPLICIT)) {
|
|
return ret;
|
|
}
|
|
if (int ret = modifyUidNetworkRule(netId, table, range.start, range.stop, subPriority,
|
|
add, IMPLICIT)) {
|
|
return ret;
|
|
}
|
|
if (int ret = modifyUidDefaultNetworkRule(table, range.start, range.stop, subPriority,
|
|
add)) {
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!modifyNonUidBasedRules) {
|
|
// we are done.
|
|
return 0;
|
|
}
|
|
|
|
if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) {
|
|
return ret;
|
|
}
|
|
if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID,
|
|
UidRanges::DEFAULT_SUB_PRIORITY, add)) {
|
|
return ret;
|
|
}
|
|
if (int ret = modifyOutputInterfaceRules(interface, table, permission, INVALID_UID, INVALID_UID,
|
|
UidRanges::DEFAULT_SUB_PRIORITY, add)) {
|
|
return ret;
|
|
}
|
|
|
|
// Only set implicit rules for networks that don't require permissions.
|
|
//
|
|
// This is so that if the default network ceases to be the default network and then switches
|
|
// from requiring no permissions to requiring permissions, we ensure that apps only use the
|
|
// network if they explicitly select it. This is consistent with destroySocketsLackingPermission
|
|
// - it closes all sockets on the network except sockets that are explicitly selected.
|
|
//
|
|
// The lack of this rule only affects the special case above, because:
|
|
// - The only cases where we implicitly bind a socket to a network are the default network and
|
|
// the bypassable VPN that applies to the app, if any.
|
|
// - This rule doesn't affect VPNs because they don't support permissions at all.
|
|
// - The default network doesn't require permissions. While we support doing this, the framework
|
|
// never does it (partly because we'd end up in the situation where we tell apps that there is
|
|
// a default network, but they can't use it).
|
|
// - If the network is still the default network, the presence or absence of this rule does not
|
|
// matter.
|
|
//
|
|
// Therefore, for the lack of this rule to affect a socket, the socket has to have been
|
|
// implicitly bound to a network because at the time of connect() it was the default, and that
|
|
// network must no longer be the default, and must now require permissions.
|
|
if (permission == PERMISSION_NONE) {
|
|
return modifyImplicitNetworkRule(netId, table, add);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
[[nodiscard]] static int modifyUidUnreachableRule(unsigned netId, uid_t uidStart, uid_t uidEnd,
|
|
uint32_t subPriority, bool add,
|
|
bool explicitSelect) {
|
|
if ((uidStart == INVALID_UID) || (uidEnd == INVALID_UID)) {
|
|
ALOGE("modifyUidUnreachableRule, invalid UIDs (%u, %u)", uidStart, uidEnd);
|
|
return -EUSERS;
|
|
}
|
|
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.netId = netId;
|
|
mask.netId = FWMARK_NET_ID_MASK;
|
|
|
|
fwmark.explicitlySelected = explicitSelect;
|
|
mask.explicitlySelected = true;
|
|
|
|
// Access to this network is controlled by UID rules, not permission bits.
|
|
fwmark.permission = PERMISSION_NONE;
|
|
mask.permission = PERMISSION_NONE;
|
|
|
|
return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE,
|
|
explicitSelect ? (RULE_PRIORITY_UID_EXPLICIT_NETWORK + subPriority)
|
|
: (RULE_PRIORITY_UID_IMPLICIT_NETWORK + subPriority),
|
|
FR_ACT_UNREACHABLE, RT_TABLE_UNSPEC, fwmark.intValue, mask.intValue,
|
|
IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd);
|
|
}
|
|
|
|
[[nodiscard]] static int modifyUidDefaultUnreachableRule(uid_t uidStart, uid_t uidEnd,
|
|
uint32_t subPriority, bool add) {
|
|
if ((uidStart == INVALID_UID) || (uidEnd == INVALID_UID)) {
|
|
ALOGE("modifyUidDefaultUnreachableRule, invalid UIDs (%u, %u)", uidStart, uidEnd);
|
|
return -EUSERS;
|
|
}
|
|
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.netId = NETID_UNSET;
|
|
mask.netId = FWMARK_NET_ID_MASK;
|
|
|
|
// Access to this network is controlled by UID rules, not permission bits.
|
|
fwmark.permission = PERMISSION_NONE;
|
|
mask.permission = PERMISSION_NONE;
|
|
|
|
return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE,
|
|
RULE_PRIORITY_UID_DEFAULT_UNREACHABLE + subPriority, FR_ACT_UNREACHABLE,
|
|
RT_TABLE_UNSPEC, fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE,
|
|
uidStart, uidEnd);
|
|
}
|
|
|
|
int RouteController::modifyUnreachableNetwork(unsigned netId, const UidRangeMap& uidRangeMap,
|
|
bool add) {
|
|
for (const auto& [subPriority, uidRanges] : uidRangeMap) {
|
|
for (const UidRangeParcel& range : uidRanges.getRanges()) {
|
|
if (int ret = modifyUidUnreachableRule(netId, range.start, range.stop, subPriority, add,
|
|
EXPLICIT)) {
|
|
return ret;
|
|
}
|
|
if (int ret = modifyUidUnreachableRule(netId, range.start, range.stop, subPriority, add,
|
|
IMPLICIT)) {
|
|
return ret;
|
|
}
|
|
if (int ret = modifyUidDefaultUnreachableRule(range.start, range.stop, subPriority,
|
|
add)) {
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
[[nodiscard]] static int modifyRejectNonSecureNetworkRule(const UidRanges& uidRanges, bool add) {
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
fwmark.protectedFromVpn = false;
|
|
mask.protectedFromVpn = true;
|
|
|
|
for (const UidRangeParcel& range : uidRanges.getRanges()) {
|
|
if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_PROHIBIT_NON_VPN,
|
|
FR_ACT_PROHIBIT, RT_TABLE_UNSPEC, fwmark.intValue, mask.intValue,
|
|
IIF_LOOPBACK, OIF_NONE, range.start, range.stop)) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int RouteController::modifyVirtualNetwork(unsigned netId, const char* interface,
|
|
const UidRangeMap& uidRangeMap, bool secure, bool add,
|
|
bool modifyNonUidBasedRules) {
|
|
uint32_t table = getRouteTableForInterface(interface);
|
|
if (table == RT_TABLE_UNSPEC) {
|
|
return -ESRCH;
|
|
}
|
|
|
|
for (const auto& [subPriority, uidRanges] : uidRangeMap) {
|
|
for (const UidRangeParcel& range : uidRanges.getRanges()) {
|
|
if (int ret = modifyVpnUidRangeRule(table, range.start, range.stop, subPriority, secure,
|
|
add)) {
|
|
return ret;
|
|
}
|
|
if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.start,
|
|
range.stop, subPriority, add)) {
|
|
return ret;
|
|
}
|
|
if (int ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, range.start,
|
|
range.stop, subPriority, add)) {
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (modifyNonUidBasedRules) {
|
|
if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) {
|
|
return ret;
|
|
}
|
|
if (int ret = modifyVpnOutputToLocalRule(interface, add)) {
|
|
return ret;
|
|
}
|
|
if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) {
|
|
return ret;
|
|
}
|
|
return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT,
|
|
UidRanges::DEFAULT_SUB_PRIORITY, add);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int RouteController::modifyDefaultNetwork(uint16_t action, const char* interface,
|
|
Permission permission) {
|
|
uint32_t table = getRouteTableForInterface(interface);
|
|
if (table == RT_TABLE_UNSPEC) {
|
|
return -ESRCH;
|
|
}
|
|
|
|
Fwmark fwmark;
|
|
Fwmark mask;
|
|
|
|
fwmark.netId = NETID_UNSET;
|
|
mask.netId = FWMARK_NET_ID_MASK;
|
|
|
|
fwmark.permission = permission;
|
|
mask.permission = permission;
|
|
|
|
return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue,
|
|
mask.intValue, IIF_LOOPBACK, OIF_NONE, INVALID_UID, INVALID_UID);
|
|
}
|
|
|
|
int RouteController::modifyTetheredNetwork(uint16_t action, const char* inputInterface,
|
|
const char* outputInterface) {
|
|
uint32_t table = getRouteTableForInterface(outputInterface);
|
|
if (table == RT_TABLE_UNSPEC) {
|
|
return -ESRCH;
|
|
}
|
|
|
|
return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET,
|
|
inputInterface, OIF_NONE, INVALID_UID, INVALID_UID);
|
|
}
|
|
|
|
// Adds or removes an IPv4 or IPv6 route to the specified table.
|
|
// Returns 0 on success or negative errno on failure.
|
|
int RouteController::modifyRoute(uint16_t action, uint16_t flags, const char* interface,
|
|
const char* destination, const char* nexthop, TableType tableType,
|
|
int mtu) {
|
|
uint32_t table;
|
|
switch (tableType) {
|
|
case RouteController::INTERFACE: {
|
|
table = getRouteTableForInterface(interface);
|
|
if (table == RT_TABLE_UNSPEC) {
|
|
return -ESRCH;
|
|
}
|
|
break;
|
|
}
|
|
case RouteController::LOCAL_NETWORK: {
|
|
table = ROUTE_TABLE_LOCAL_NETWORK;
|
|
break;
|
|
}
|
|
case RouteController::LEGACY_NETWORK: {
|
|
table = ROUTE_TABLE_LEGACY_NETWORK;
|
|
break;
|
|
}
|
|
case RouteController::LEGACY_SYSTEM: {
|
|
table = ROUTE_TABLE_LEGACY_SYSTEM;
|
|
break;
|
|
}
|
|
}
|
|
|
|
int ret = modifyIpRoute(action, flags, table, interface, destination, nexthop, mtu);
|
|
// Trying to add a route that already exists shouldn't cause an error.
|
|
if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) {
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void maybeModifyQdiscClsact(const char* interface, bool add) {
|
|
// The clsact attaching of v4- tun interface is triggered by ClatdController::maybeStartBpf
|
|
// because the clat is started before the v4- interface is added to the network and the
|
|
// clat startup needs to add {in, e}gress filters.
|
|
// TODO: remove this workaround once v4- tun interface clsact attaching is moved out from
|
|
// ClatdController::maybeStartBpf.
|
|
if (StartsWith(interface, "v4-") && add) return;
|
|
|
|
// The interface may have already gone away in the delete case.
|
|
uint32_t ifindex = if_nametoindex(interface);
|
|
if (!ifindex) {
|
|
ALOGE("cannot find interface %s", interface);
|
|
return;
|
|
}
|
|
|
|
if (add) {
|
|
if (int ret = tcQdiscAddDevClsact(ifindex)) {
|
|
ALOGE("tcQdiscAddDevClsact(%d[%s]) failure: %s", ifindex, interface, strerror(-ret));
|
|
return;
|
|
}
|
|
} else {
|
|
if (int ret = tcQdiscDelDevClsact(ifindex)) {
|
|
ALOGE("tcQdiscDelDevClsact(%d[%s]) failure: %s", ifindex, interface, strerror(-ret));
|
|
return;
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
[[nodiscard]] static int clearTetheringRules(const char* inputInterface) {
|
|
int ret = 0;
|
|
while (ret == 0) {
|
|
ret = modifyIpRule(RTM_DELRULE, RULE_PRIORITY_TETHERING, 0, MARK_UNSET, MARK_UNSET,
|
|
inputInterface, OIF_NONE, INVALID_UID, INVALID_UID);
|
|
}
|
|
|
|
if (ret == -ENOENT) {
|
|
return 0;
|
|
} else {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
uint32_t getRulePriority(const nlmsghdr *nlh) {
|
|
return getRtmU32Attribute(nlh, FRA_PRIORITY);
|
|
}
|
|
|
|
uint32_t getRouteTable(const nlmsghdr *nlh) {
|
|
return getRtmU32Attribute(nlh, RTA_TABLE);
|
|
}
|
|
|
|
[[nodiscard]] static int flushRules() {
|
|
NetlinkDumpFilter shouldDelete = [] (nlmsghdr *nlh) {
|
|
// Don't touch rules at priority 0 because by default they are used for local input.
|
|
return getRulePriority(nlh) != 0;
|
|
};
|
|
return rtNetlinkFlush(RTM_GETRULE, RTM_DELRULE, "rules", shouldDelete);
|
|
}
|
|
|
|
int RouteController::flushRoutes(uint32_t table) {
|
|
NetlinkDumpFilter shouldDelete = [table] (nlmsghdr *nlh) {
|
|
return getRouteTable(nlh) == table;
|
|
};
|
|
|
|
return rtNetlinkFlush(RTM_GETROUTE, RTM_DELROUTE, "routes", shouldDelete);
|
|
}
|
|
|
|
// Returns 0 on success or negative errno on failure.
|
|
int RouteController::flushRoutes(const char* interface) {
|
|
std::lock_guard lock(sInterfaceToTableLock);
|
|
|
|
uint32_t table = getRouteTableForInterfaceLocked(interface);
|
|
if (table == RT_TABLE_UNSPEC) {
|
|
return -ESRCH;
|
|
}
|
|
|
|
int ret = flushRoutes(table);
|
|
|
|
// If we failed to flush routes, the caller may elect to keep this interface around, so keep
|
|
// track of its name.
|
|
if (ret == 0) {
|
|
sInterfaceToTable.erase(interface);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int RouteController::Init(unsigned localNetId) {
|
|
if (int ret = flushRules()) {
|
|
return ret;
|
|
}
|
|
if (int ret = addLegacyRouteRules()) {
|
|
return ret;
|
|
}
|
|
if (int ret = addLocalNetworkRules(localNetId)) {
|
|
return ret;
|
|
}
|
|
if (int ret = addUnreachableRule()) {
|
|
return ret;
|
|
}
|
|
// Don't complain if we can't add the dummy network, since not all devices support it.
|
|
configureDummyNetwork();
|
|
|
|
updateTableNamesFile();
|
|
return 0;
|
|
}
|
|
|
|
int RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) {
|
|
if (int ret = modifyLocalNetwork(netId, interface, ACTION_ADD)) {
|
|
return ret;
|
|
}
|
|
std::lock_guard lock(sInterfaceToTableLock);
|
|
sInterfaceToTable[interface] = ROUTE_TABLE_LOCAL_NETWORK;
|
|
return 0;
|
|
}
|
|
|
|
int RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) {
|
|
if (int ret = modifyLocalNetwork(netId, interface, ACTION_DEL)) {
|
|
return ret;
|
|
}
|
|
std::lock_guard lock(sInterfaceToTableLock);
|
|
sInterfaceToTable.erase(interface);
|
|
return 0;
|
|
}
|
|
|
|
int RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface,
|
|
Permission permission,
|
|
const UidRangeMap& uidRangeMap) {
|
|
if (int ret = modifyPhysicalNetwork(netId, interface, uidRangeMap, permission, ACTION_ADD,
|
|
MODIFY_NON_UID_BASED_RULES)) {
|
|
return ret;
|
|
}
|
|
maybeModifyQdiscClsact(interface, ACTION_ADD);
|
|
updateTableNamesFile();
|
|
return 0;
|
|
}
|
|
|
|
int RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface,
|
|
Permission permission,
|
|
const UidRangeMap& uidRangeMap) {
|
|
if (int ret = modifyPhysicalNetwork(netId, interface, uidRangeMap, permission, ACTION_DEL,
|
|
MODIFY_NON_UID_BASED_RULES)) {
|
|
return ret;
|
|
}
|
|
if (int ret = flushRoutes(interface)) {
|
|
return ret;
|
|
}
|
|
if (int ret = clearTetheringRules(interface)) {
|
|
return ret;
|
|
}
|
|
maybeModifyQdiscClsact(interface, ACTION_DEL);
|
|
updateTableNamesFile();
|
|
return 0;
|
|
}
|
|
|
|
int RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface,
|
|
bool secure, const UidRangeMap& uidRangeMap) {
|
|
if (int ret = modifyVirtualNetwork(netId, interface, uidRangeMap, secure, ACTION_ADD,
|
|
MODIFY_NON_UID_BASED_RULES)) {
|
|
return ret;
|
|
}
|
|
updateTableNamesFile();
|
|
return 0;
|
|
}
|
|
|
|
int RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface,
|
|
bool secure,
|
|
const UidRangeMap& uidRangeMap) {
|
|
if (int ret = modifyVirtualNetwork(netId, interface, uidRangeMap, secure, ACTION_DEL,
|
|
MODIFY_NON_UID_BASED_RULES)) {
|
|
return ret;
|
|
}
|
|
if (int ret = flushRoutes(interface)) {
|
|
return ret;
|
|
}
|
|
updateTableNamesFile();
|
|
return 0;
|
|
}
|
|
|
|
int RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface,
|
|
Permission oldPermission,
|
|
Permission newPermission) {
|
|
// Physical network rules either use permission bits or UIDs, but not both.
|
|
// So permission changes don't affect any UID-based rules.
|
|
UidRangeMap emptyUidRangeMap;
|
|
// Add the new rules before deleting the old ones, to avoid race conditions.
|
|
if (int ret = modifyPhysicalNetwork(netId, interface, emptyUidRangeMap, newPermission,
|
|
ACTION_ADD, MODIFY_NON_UID_BASED_RULES)) {
|
|
return ret;
|
|
}
|
|
return modifyPhysicalNetwork(netId, interface, emptyUidRangeMap, oldPermission, ACTION_DEL,
|
|
MODIFY_NON_UID_BASED_RULES);
|
|
}
|
|
|
|
int RouteController::addUsersToRejectNonSecureNetworkRule(const UidRanges& uidRanges) {
|
|
return modifyRejectNonSecureNetworkRule(uidRanges, true);
|
|
}
|
|
|
|
int RouteController::removeUsersFromRejectNonSecureNetworkRule(const UidRanges& uidRanges) {
|
|
return modifyRejectNonSecureNetworkRule(uidRanges, false);
|
|
}
|
|
|
|
int RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure,
|
|
const UidRangeMap& uidRangeMap) {
|
|
return modifyVirtualNetwork(netId, interface, uidRangeMap, secure, ACTION_ADD,
|
|
!MODIFY_NON_UID_BASED_RULES);
|
|
}
|
|
|
|
int RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface,
|
|
bool secure, const UidRangeMap& uidRangeMap) {
|
|
return modifyVirtualNetwork(netId, interface, uidRangeMap, secure, ACTION_DEL,
|
|
!MODIFY_NON_UID_BASED_RULES);
|
|
}
|
|
|
|
int RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) {
|
|
return modifyDefaultNetwork(RTM_NEWRULE, interface, permission);
|
|
}
|
|
|
|
int RouteController::removeInterfaceFromDefaultNetwork(const char* interface,
|
|
Permission permission) {
|
|
return modifyDefaultNetwork(RTM_DELRULE, interface, permission);
|
|
}
|
|
|
|
int RouteController::addRoute(const char* interface, const char* destination, const char* nexthop,
|
|
TableType tableType, int mtu) {
|
|
return modifyRoute(RTM_NEWROUTE, NETLINK_ROUTE_CREATE_FLAGS, interface, destination, nexthop,
|
|
tableType, mtu);
|
|
}
|
|
|
|
int RouteController::removeRoute(const char* interface, const char* destination,
|
|
const char* nexthop, TableType tableType) {
|
|
return modifyRoute(RTM_DELROUTE, NETLINK_REQUEST_FLAGS, interface, destination, nexthop,
|
|
tableType, 0);
|
|
}
|
|
|
|
int RouteController::updateRoute(const char* interface, const char* destination,
|
|
const char* nexthop, TableType tableType, int mtu) {
|
|
return modifyRoute(RTM_NEWROUTE, NETLINK_ROUTE_REPLACE_FLAGS, interface, destination, nexthop,
|
|
tableType, mtu);
|
|
}
|
|
|
|
int RouteController::enableTethering(const char* inputInterface, const char* outputInterface) {
|
|
return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface);
|
|
}
|
|
|
|
int RouteController::disableTethering(const char* inputInterface, const char* outputInterface) {
|
|
return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface);
|
|
}
|
|
|
|
int RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface,
|
|
Permission permission) {
|
|
return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission);
|
|
}
|
|
|
|
int RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId,
|
|
const char* physicalInterface,
|
|
Permission permission) {
|
|
return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission);
|
|
}
|
|
|
|
int RouteController::addUsersToPhysicalNetwork(unsigned netId, const char* interface,
|
|
const UidRangeMap& uidRangeMap) {
|
|
return modifyPhysicalNetwork(netId, interface, uidRangeMap, PERMISSION_NONE, ACTION_ADD,
|
|
!MODIFY_NON_UID_BASED_RULES);
|
|
}
|
|
|
|
int RouteController::removeUsersFromPhysicalNetwork(unsigned netId, const char* interface,
|
|
const UidRangeMap& uidRangeMap) {
|
|
return modifyPhysicalNetwork(netId, interface, uidRangeMap, PERMISSION_NONE, ACTION_DEL,
|
|
!MODIFY_NON_UID_BASED_RULES);
|
|
}
|
|
|
|
int RouteController::addUsersToUnreachableNetwork(unsigned netId, const UidRangeMap& uidRangeMap) {
|
|
return modifyUnreachableNetwork(netId, uidRangeMap, ACTION_ADD);
|
|
}
|
|
|
|
int RouteController::removeUsersFromUnreachableNetwork(unsigned netId,
|
|
const UidRangeMap& uidRangeMap) {
|
|
return modifyUnreachableNetwork(netId, uidRangeMap, ACTION_DEL);
|
|
}
|
|
|
|
// Protects sInterfaceToTable.
|
|
std::mutex RouteController::sInterfaceToTableLock;
|
|
std::map<std::string, uint32_t> RouteController::sInterfaceToTable;
|
|
|
|
} // namespace android::net
|