RouteController.cpp revision 107075a48973c18a087a5cb2ad2ad43e73f9909a
15c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran/* 25c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Copyright (C) 2014 The Android Open Source Project 35c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 45c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Licensed under the Apache License, Version 2.0 (the "License"); 55c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * you may not use this file except in compliance with the License. 65c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * You may obtain a copy of the License at 75c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 85c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * http://www.apache.org/licenses/LICENSE-2.0 95c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 105c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Unless required by applicable law or agreed to in writing, software 115c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * distributed under the License is distributed on an "AS IS" BASIS, 125c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 135c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * See the License for the specific language governing permissions and 145c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * limitations under the License. 155c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran */ 165c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 175c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "RouteController.h" 185c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 19aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <arpa/inet.h> 20aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <errno.h> 21aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <fcntl.h> 22aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <linux/fib_rules.h> 23aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <net/if.h> 24aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <sys/stat.h> 25aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert 26bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes#include <private/android_filesystem_config.h> 27bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes 28aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <map> 29aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert 307035f228d17e925116b1b64a7c917b3196ab8818Lorenzo Colitti#include "DummyNetwork.h" 315c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "Fwmark.h" 32c1306ea230c95ef0268d4d20a213911799982671Lorenzo Colitti#include "NetdConstants.h" 331ef549de8a21612ab61861ff0035877a4b76184dLorenzo Colitti#include "NetlinkCommands.h" 34b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran#include "UidRanges.h" 35f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 36bbd5626b3d0994ff0ecbfceac75f6dc4abfb55c6Elliott Hughes#include "android-base/file.h" 37c1306ea230c95ef0268d4d20a213911799982671Lorenzo Colitti#include <android-base/stringprintf.h> 38f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#define LOG_TAG "Netd" 39f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "log/log.h" 40f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "logwrap/logwrap.h" 413667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti#include "netutils/ifc.h" 425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran#include "resolv_netid.h" 435c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 44c1306ea230c95ef0268d4d20a213911799982671Lorenzo Colittiusing android::base::StringPrintf; 455407e14fd3d81bb76f94221b4a359faa2806de65Dan Albertusing android::base::WriteStringToFile; 46dc0d578a69cc5a57167a508207e2198590142d51Robin Leeusing android::net::UidRange; 475407e14fd3d81bb76f94221b4a359faa2806de65Dan Albert 487035f228d17e925116b1b64a7c917b3196ab8818Lorenzo Colittinamespace android { 497035f228d17e925116b1b64a7c917b3196ab8818Lorenzo Colittinamespace net { 507035f228d17e925116b1b64a7c917b3196ab8818Lorenzo Colitti 51c1306ea230c95ef0268d4d20a213911799982671Lorenzo Colittiauto RouteController::iptablesRestoreCommandFunction = execIptablesRestoreCommand; 52c1306ea230c95ef0268d4d20a213911799982671Lorenzo Colitti 53f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// BEGIN CONSTANTS -------------------------------------------------------------------------------- 54f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000; 5657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitticonst uint32_t RULE_PRIORITY_VPN_OVERRIDE_OIF = 10500; 57111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL = 11000; 585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_SECURE_VPN = 12000; 596c84ef62d953eae93c36ffa831e9b451560afba0Robin Leeconst uint32_t RULE_PRIORITY_PROHIBIT_NON_VPN = 12500; 605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; 615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; 625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; 635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; 646a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranconst uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; 6587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t RULE_PRIORITY_TETHERING = 18000; 665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000; 6795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranconst uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000; 6848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000; 695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; 70db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitticonst uint32_t RULE_PRIORITY_UNREACHABLE = 32000; 715c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 7287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97; 734acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98; 744acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99; 754acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 7687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network"; 774acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network"; 784acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system"; 794acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 80bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL = "local"; 81bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_MAIN = "main"; 82bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 83b5d19e9ca694af30226c83583005a583d441203eLorenzo Colitti// None of our regular routes specify priority, which causes them to have the default priority. 84b5d19e9ca694af30226c83583005a583d441203eLorenzo Colitti// For default throw routes, we use a fixed priority of 100000. 855e03a893d999d04b7329ab8825782d75872d680fLorenzo Colittiuint32_t PRIO_THROW = 100000; 865e03a893d999d04b7329ab8825782d75872d680fLorenzo Colitti 87d78843eb11fdde1611598fd27d347912070c0555Lorenzo Colitticonst char* const RouteController::LOCAL_MANGLE_INPUT = "routectrl_mangle_INPUT"; 88d78843eb11fdde1611598fd27d347912070c0555Lorenzo Colitti 89f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; 90f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uid_t UID_ROOT = 0; 923093f5676227bd84cc61051d035a9e8dfcfa15c1Lorenzo Colitticonst uint32_t FWMARK_NONE = 0; 933093f5676227bd84cc61051d035a9e8dfcfa15c1Lorenzo Colitticonst uint32_t MASK_NONE = 0; 945ad4e98f7b566ffde39491ee4e80d4a15507f053Lorenzo Colitticonst char* const IIF_LOOPBACK = "lo"; 9587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const IIF_NONE = NULL; 965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst char* const OIF_NONE = NULL; 975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_ADD = true; 985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_DEL = false; 995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool MODIFY_NON_UID_BASED_RULES = true; 1005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 1014acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 102c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r-- 1034acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 104f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" 105f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). 106f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconstexpr uint16_t U16_RTA_LENGTH(uint16_t x) { 107f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return RTA_LENGTH(x); 108f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran} 109f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 110f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// These are practically const, but can't be declared so, because they are used to initialize 111f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// non-const pointers ("void* iov_base") in iovec arrays. 1122b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colittirtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; 1132b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colittirtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; 1142b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colittirtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; 1152b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colittirtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; 1162b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colittirtattr FRATTR_UID_RANGE = { U16_RTA_LENGTH(sizeof(fib_rule_uid_range)), FRA_UID_RANGE }; 117f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 1182b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colittirtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; 1192b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colittirtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; 1205e03a893d999d04b7329ab8825782d75872d680fLorenzo Colittirtattr RTATTR_PRIO = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_PRIORITY }; 121f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 122f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranuint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; 123f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 124f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// END CONSTANTS ---------------------------------------------------------------------------------- 125f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 1260b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitticonst char *actionName(uint16_t action) { 1270b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti static const char *ops[4] = {"adding", "deleting", "getting", "???"}; 1280b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti return ops[action % 4]; 1290b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti} 1300b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti 1310b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitticonst char *familyName(uint8_t family) { 1320b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti switch (family) { 1330b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti case AF_INET: return "IPv4"; 1340b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti case AF_INET6: return "IPv6"; 1350b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti default: return "???"; 1360b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti } 1370b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti} 1380b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti 139107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti// Caller must hold sInterfaceToTableLock. 140107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colittiuint32_t RouteController::getRouteTableForInterfaceLocked(const char* interface) { 141a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran uint32_t index = if_nametoindex(interface); 142a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen if (index) { 1434acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; 14402cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti sInterfaceToTable[interface] = index; 1454acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return index; 1464acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1474acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // If the interface goes away if_nametoindex() will return 0 but we still need to know 1484acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // the index so we can remove the rules and routes. 14902cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti auto iter = sInterfaceToTable.find(interface); 15002cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti if (iter == sInterfaceToTable.end()) { 1514acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 1524acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return RT_TABLE_UNSPEC; 1534acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1544acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return iter->second; 1554acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1564acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 157107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colittiuint32_t RouteController::getRouteTableForInterface(const char* interface) { 158107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti android::RWLock::AutoRLock lock(sInterfaceToTableLock); 159107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti return getRouteTableForInterfaceLocked(interface); 160107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti} 161107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti 1624acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid addTableName(uint32_t table, const std::string& name, std::string* contents) { 1634acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran char tableString[UINT32_STRLEN]; 1644acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran snprintf(tableString, sizeof(tableString), "%u", table); 1654acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += tableString; 1664acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += " "; 1674acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += name; 1684acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += "\n"; 1694acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1704acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1714acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// Doesn't return success/failure as the file is optional; it's okay if we fail to update it. 17202cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colittivoid RouteController::updateTableNamesFile() { 1734acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran std::string contents; 174bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 175bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents); 176bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents); 177bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 17887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents); 1794acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); 1804acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); 181bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 182107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti android::RWLock::AutoRLock lock(sInterfaceToTableLock); 18302cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti for (const auto& entry : sInterfaceToTable) { 1844acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(entry.second, entry.first, &contents); 1854acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1864acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1875407e14fd3d81bb76f94221b4a359faa2806de65Dan Albert if (!WriteStringToFile(contents, RT_TABLES_PATH, RT_TABLES_MODE, AID_SYSTEM, AID_WIFI)) { 188bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes ALOGE("failed to write to %s (%s)", RT_TABLES_PATH, strerror(errno)); 1894acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return; 190a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen } 1915c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 1925c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 19387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 19487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { 19587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (!input) { 19687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = 0; 19787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = 0; 19887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 19987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 20087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = strlcpy(name, input, IFNAMSIZ) + 1; 20187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (*length > IFNAMSIZ) { 20287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); 20387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return -ENAMETOOLONG; 20487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 20587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); 20687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 20787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 20887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 2098fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 2108fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 2116b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the table is 2124ef94642636182e68495f606a65c00f8a830aad4Robin Lee// unspecified. An unspecified table is not allowed when creating an FR_ACT_TO_TBL rule. 2138fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 2148fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 21587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |iif| is non-NULL, the rule matches the specified incoming interface. 21687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |oif| is non-NULL, the rule matches the specified outgoing interface. 21787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that 21887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// range (inclusive). Otherwise, the rule matches packets from all UIDs. 21996f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// 22096f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// Returns 0 on success or negative errno on failure. 2214ef94642636182e68495f606a65c00f8a830aad4Robin LeeWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint8_t ruleType, 2224ef94642636182e68495f606a65c00f8a830aad4Robin Lee uint32_t table, uint32_t fwmark, uint32_t mask, const char* iif, 22387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran const char* oif, uid_t uidStart, uid_t uidEnd) { 224f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 225f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (fwmark & ~mask) { 226f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 227f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ERANGE; 228f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 229f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 23087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran // Interface names must include exactly one terminating NULL and be properly padded, or older 2314753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // kernels will refuse to delete rules. 23287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; 23387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran size_t iifLength, oifLength; 23487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint16_t iifPadding, oifPadding; 23587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { 23687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 23787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 23887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { 23987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 2404753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2417619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2425965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti // Either both start and end UID must be specified, or neither. 243f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 244cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 2455965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti return -EUSERS; 2465965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti } 2474ef94642636182e68495f606a65c00f8a830aad4Robin Lee 24872723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti bool isUidRule = (uidStart != INVALID_UID); 2495965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 2504753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rule request and put it in an array of iovec structures. 2514753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti fib_rule_hdr rule = { 2524ef94642636182e68495f606a65c00f8a830aad4Robin Lee .action = ruleType, 2536b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // Note that here we're implicitly setting rule.table to 0. When we want to specify a 2546b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // non-zero table, we do this via the FRATTR_TABLE attribute. 2554753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 256a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 2576b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // Don't ever create a rule that looks up table 0, because table 0 is the local table. 2586b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // It's OK to specify a table ID of 0 when deleting a rule, because that doesn't actually select 2596b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // table 0, it's a wildcard that matches anything. 2606b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (table == RT_TABLE_UNSPEC && rule.action == FR_ACT_TO_TBL && action != RTM_DELRULE) { 2616b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti ALOGE("RT_TABLE_UNSPEC only allowed when deleting rules"); 2626b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return -ENOTUNIQ; 2636b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 2646b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti 26587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; 26687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; 2672b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colitti struct fib_rule_uid_range uidRange = { uidStart, uidEnd }; 268a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 2694753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iovec iov[] = { 270f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 271f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rule, sizeof(rule) }, 272f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 273f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &priority, sizeof(priority) }, 2745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 2755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 276f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 277f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &fwmark, mask ? sizeof(fwmark) : 0 }, 278f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 279f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &mask, mask ? sizeof(mask) : 0 }, 2802b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colitti { &FRATTR_UID_RANGE, isUidRule ? sizeof(FRATTR_UID_RANGE) : 0 }, 2812b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colitti { &uidRange, isUidRule ? sizeof(uidRange) : 0 }, 28287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, 28387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { iifName, iifLength }, 28487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, iifPadding }, 28587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, 28687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { oifName, oifLength }, 28787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, oifPadding }, 2884753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 2894753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 29072723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; 291f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 292f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rule.family = AF_FAMILIES[i]; 293f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov), nullptr)) { 294220ca739ad863fcd40c9ca107f6e0f68f7a45d14Lorenzo Colitti if (!(action == RTM_DELRULE && ret == -ENOENT && priority == RULE_PRIORITY_TETHERING)) { 295220ca739ad863fcd40c9ca107f6e0f68f7a45d14Lorenzo Colitti // Don't log when deleting a tethering rule that's not there. This matches the 296220ca739ad863fcd40c9ca107f6e0f68f7a45d14Lorenzo Colitti // behaviour of clearTetheringRules, which ignores ENOENT in this case. 297220ca739ad863fcd40c9ca107f6e0f68f7a45d14Lorenzo Colitti ALOGE("Error %s %s rule: %s", actionName(action), familyName(rule.family), 298220ca739ad863fcd40c9ca107f6e0f68f7a45d14Lorenzo Colitti strerror(-ret)); 299220ca739ad863fcd40c9ca107f6e0f68f7a45d14Lorenzo Colitti } 30096f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return ret; 3015c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3025c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3035c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 30496f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return 0; 3055c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 3065c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 30787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 3084ef94642636182e68495f606a65c00f8a830aad4Robin Lee uint32_t fwmark, uint32_t mask, const char* iif, 3094ef94642636182e68495f606a65c00f8a830aad4Robin Lee const char* oif, uid_t uidStart, uid_t uidEnd) { 3104ef94642636182e68495f606a65c00f8a830aad4Robin Lee return modifyIpRule(action, priority, FR_ACT_TO_TBL, table, fwmark, mask, iif, oif, uidStart, 3114ef94642636182e68495f606a65c00f8a830aad4Robin Lee uidEnd); 3124ef94642636182e68495f606a65c00f8a830aad4Robin Lee} 3134ef94642636182e68495f606a65c00f8a830aad4Robin Lee 3144ef94642636182e68495f606a65c00f8a830aad4Robin LeeWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 31587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask) { 31687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, 31787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID); 31887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 31987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 320ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Adds or deletes an IPv4 or IPv6 route. 321ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Returns 0 on success or negative errno on failure. 322f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 323f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran const char* destination, const char* nexthop) { 324ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // At least the destination must be non-null. 325ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!destination) { 326f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("null destination"); 327ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EFAULT; 328ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 329ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 330ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // Parse the prefix. 331ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawAddress[sizeof(in6_addr)]; 332f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t family; 333f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t prefixLength; 334ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 335ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti &prefixLength); 336ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (rawLength < 0) { 337f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 338ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return rawLength; 339ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 3407619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 341ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 3421201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 343ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 344ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 345ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 346de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t type = RTN_UNICAST; 347ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint32_t ifindex; 348de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t rawNexthop[sizeof(in6_addr)]; 349de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran 350de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && !strcmp(nexthop, "unreachable")) { 351de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran type = RTN_UNREACHABLE; 352de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup 353de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for 354de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.) 355de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran interface = OIF_NONE; 356de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran nexthop = NULL; 3574c95a125e0930c112555437589f7620575482095Lorenzo Colitti } else if (nexthop && !strcmp(nexthop, "throw")) { 3584c95a125e0930c112555437589f7620575482095Lorenzo Colitti type = RTN_THROW; 3594c95a125e0930c112555437589f7620575482095Lorenzo Colitti interface = OIF_NONE; 3604c95a125e0930c112555437589f7620575482095Lorenzo Colitti nexthop = NULL; 361de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } else { 362de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If an interface was specified, find the ifindex. 363de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (interface != OIF_NONE) { 364de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ifindex = if_nametoindex(interface); 365de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (!ifindex) { 366de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 367de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -ENODEV; 368de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 3697619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 3707619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 371de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If a nexthop was specified, parse it as the same family as the prefix. 372de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 373de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("inet_pton failed for nexthop %s", nexthop); 374de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -EINVAL; 375de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 376ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 377ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 3785e03a893d999d04b7329ab8825782d75872d680fLorenzo Colitti bool isDefaultThrowRoute = (type == RTN_THROW && prefixLength == 0); 3795e03a893d999d04b7329ab8825782d75872d680fLorenzo Colitti 3804753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rtmsg and put it in an array of iovec structures. 381f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtmsg route = { 382ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_protocol = RTPROT_STATIC, 383de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran .rtm_type = type, 384ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_family = family, 385ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_dst_len = prefixLength, 3862bff72e0cf091f4d71af0c81cfc74e8ebd8c6644Sreeram Ramachandran .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK), 387ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 3884753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 389f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 390f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 391ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 392ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti iovec iov[] = { 393f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 394f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &route, sizeof(route) }, 395f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 396f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &table, sizeof(table) }, 397f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaDst, sizeof(rtaDst) }, 398f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawAddress, static_cast<size_t>(rawLength) }, 3995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 4005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 401f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 402f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 4035e03a893d999d04b7329ab8825782d75872d680fLorenzo Colitti { &RTATTR_PRIO, isDefaultThrowRoute ? sizeof(RTATTR_PRIO) : 0 }, 4045e03a893d999d04b7329ab8825782d75872d680fLorenzo Colitti { &PRIO_THROW, isDefaultThrowRoute ? sizeof(PRIO_THROW) : 0 }, 405ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 406ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 407f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : 408f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran NETLINK_REQUEST_FLAGS; 409f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov), nullptr); 4100b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti if (ret) { 4110b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti ALOGE("Error %s route %s -> %s %s to table %u: %s", 4120b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti actionName(action), destination, nexthop, interface, table, strerror(-ret)); 4130b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti } 4140b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti return ret; 4157619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 4167619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 4175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// An iptables rule to mark incoming packets on a network with the netId of the network. 4185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is so that the kernel can: 4205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 4215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// replies, SYN-ACKs, etc). 4225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Mark sockets that accept connections from this interface so that the connection stays on the 4235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// same interface. 4245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 4255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 4295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = true; 4315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 433d78843eb11fdde1611598fd27d347912070c0555Lorenzo Colitti std::string cmd = StringPrintf("%s %s -i %s -j MARK --set-mark 0x%x", 434d78843eb11fdde1611598fd27d347912070c0555Lorenzo Colitti add ? "-A" : "-D", RouteController::LOCAL_MANGLE_INPUT, 435d78843eb11fdde1611598fd27d347912070c0555Lorenzo Colitti interface, fwmark.intValue); 436c1306ea230c95ef0268d4d20a213911799982671Lorenzo Colitti if (RouteController::iptablesRestoreCommandFunction(V4V6, "mangle", cmd, nullptr) != 0) { 437b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran ALOGE("failed to change iptables rule that sets incoming packet mark"); 438b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return -EREMOTEIO; 439b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 4405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 441b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 442b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 443b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 444111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// A rule to route responses to the local network forwarded via the VPN. 445111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// 446111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// When a VPN is in effect, packets from the local network to upstream networks are forwarded into 447111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel. 448111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) { 449111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL, 450111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE, 451111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran INVALID_UID, INVALID_UID); 452111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran} 453111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran 454fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to route all traffic from a given set of UIDs to go over the VPN. 455fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 456fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 457fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 458fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// bypass the VPN if the protectedFromVpn bit is set. 459fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 46095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, bool add) { 461fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 462fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 463fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 464fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.protectedFromVpn = false; 465fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.protectedFromVpn = true; 466fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 46795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority; 46895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 46995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (secure) { 47095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_SECURE_VPN; 47195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } else { 47295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_BYPASSABLE_VPN; 47395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 47495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran fwmark.explicitlySelected = false; 47595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.explicitlySelected = true; 47695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } 47795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 47895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 4795ad4e98f7b566ffde39491ee4e80d4a15507f053Lorenzo Colitti mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd); 480fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 481fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 482fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 483fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// set of UIDs. 484fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 485fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 486fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// target set, but where the DnsProxyListener itself is not. 48795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure, 48895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool add) { 489fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 490fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 491fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 492fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.netId = netId; 493fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 494fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 495fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 496fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 497fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 49895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN; 49995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 50095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 50195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue); 502fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 503fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 5045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on an explicitly chosen network. 5055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 5075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 5095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// to check it again in the rules here, because a network's permissions may have been updated via 5105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// modifyNetworkPermission(). 5115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 5125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 514eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark fwmark; 515eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark mask; 516eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 517eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran fwmark.netId = netId; 518eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 519eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 5215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 522eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 5255c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 52787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); 5285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5295c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on a chosen outgoing interface. 5315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 5335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// the outgoing interface (typically for link-local communications). 53457947f02c00bb03651e3f9427c880211c689db7fLorenzo ColittiWARN_UNUSED_RESULT int modifyOutputInterfaceRules(const char* interface, uint32_t table, 53557947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti Permission permission, uid_t uidStart, 53657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti uid_t uidEnd, bool add) { 537122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 538122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 5395c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 540f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 541f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran mask.permission = permission; 5425c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 54357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti // If this rule does not specify a UID range, then also add a corresponding high-priority rule 5443093f5676227bd84cc61051d035a9e8dfcfa15c1Lorenzo Colitti // for root. This covers forwarded packets and system daemons such as the tethering DHCP server. 54557947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (uidStart == INVALID_UID && uidEnd == INVALID_UID) { 54657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OVERRIDE_OIF, 5473093f5676227bd84cc61051d035a9e8dfcfa15c1Lorenzo Colitti table, FWMARK_NONE, MASK_NONE, IIF_NONE, interface, 54857947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti UID_ROOT, UID_ROOT)) { 54957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti return ret; 55057947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti } 55157947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti } 55257947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti 5535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 55487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd); 5555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on the chosen network. 5585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is for sockets that have not explicitly requested a particular network, but have been 5605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bound to one when they called connect(). This ensures that sockets connected on a particular 5615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// network stay on that network even if the default network changes. 562be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo ColittiWARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, bool add) { 5635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 566122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 567122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 568122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 5695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 570122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 5715c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 572be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti fwmark.permission = PERMISSION_NONE; 573be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti mask.permission = PERMISSION_NONE; 574eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 57687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 5775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5785c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 57948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// A rule to enable split tunnel VPNs. 58048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// 58148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to 58248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// go over the default network, provided it wasn't explicitly restricted to the VPN and has the 58348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// permissions required by the default network. 58402cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId, 58502cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti const char* physicalInterface, 58602cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti Permission permission) { 58748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran uint32_t table = getRouteTableForInterface(physicalInterface); 58848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 58948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return -ESRCH; 59048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran } 59148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 59248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark fwmark; 59348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark mask; 59448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 59548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.netId = vpnNetId; 59648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 59748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 59848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.explicitlySelected = false; 59948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.explicitlySelected = true; 60048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 60148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.permission = permission; 60248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.permission = permission; 60348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 60448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue, 60548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.intValue); 60648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 60748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 608fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to allow legacy routes added through the requestRouteToHost() API. 609fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLegacyRouteRules() { 6105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 613fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 614fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 616fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // Rules to allow legacy routes to override the default network. 617fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 618fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue)) { 619fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 620fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 621fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 622fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { 623fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 624fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 625fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 626fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 627fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 628fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 629fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // A rule to allow legacy routes from system apps to override VPNs. 630fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 631fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue); 6325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 634fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to lookup the local network when specified explicitly or otherwise. 635fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) { 636fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 637fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran INVALID_UID, INVALID_UID, ACTION_ADD)) { 638fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 639fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 640fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 6415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 644fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 645fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 647fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, 64887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 6495c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 6505c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 65102cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti/* static */ 65202cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colittiint RouteController::configureDummyNetwork() { 6533667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti const char *interface = DummyNetwork::INTERFACE_NAME; 6543667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti uint32_t table = getRouteTableForInterface(interface); 6553667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (table == RT_TABLE_UNSPEC) { 6563667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // getRouteTableForInterface has already looged an error. 6573667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -ESRCH; 6583667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6593667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6603667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_init(); 6613667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti int ret = ifc_up(interface); 6623667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_close(); 6633667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (ret) { 6643667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't bring up %s: %s", interface, strerror(errno)); 6653667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -errno; 6663667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6673667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 66857947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if ((ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, 66957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti INVALID_UID, INVALID_UID, ACTION_ADD))) { 67057947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti ALOGE("Can't create oif rules for %s: %s", interface, strerror(-ret)); 6713667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6723667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6733667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6743667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "0.0.0.0/0", NULL))) { 6753667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6763667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6773667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6783667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "::/0", NULL))) { 6793667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6803667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6813667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6823667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return 0; 6833667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti} 6843667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 685db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that 686db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended 687db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable 688db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule will hopefully make things even clearer. 689fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addUnreachableRule() { 690c125fe43c194128167db7a2a82b736b1357945d8Robin Lee return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, FR_ACT_UNREACHABLE, RT_TABLE_UNSPEC, 691c125fe43c194128167db7a2a82b736b1357945d8Robin Lee MARK_UNSET, MARK_UNSET, IIF_NONE, OIF_NONE, INVALID_UID, INVALID_UID); 69287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 69387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 69487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { 6956a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 6966a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 6976a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 69857947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti return modifyOutputInterfaceRules(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 69957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti INVALID_UID, INVALID_UID, add); 7006a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 7016a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 70202cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti/* static */ 70302cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::modifyPhysicalNetwork(unsigned netId, const char* interface, 70402cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti Permission permission, bool add) { 7054043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7074043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return -ESRCH; 7084043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 7094043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 7115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 7145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 71757947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyOutputInterfaceRules(interface, table, permission, INVALID_UID, INVALID_UID, 7185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 721be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti 722be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // Only set implicit rules for networks that don't require permissions. 723be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // 724be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // This is so that if the default network ceases to be the default network and then switches 725be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // from requiring no permissions to requiring permissions, we ensure that apps only use the 726be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // network if they explicitly select it. This is consistent with destroySocketsLackingPermission 727be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // - it closes all sockets on the network except sockets that are explicitly selected. 728be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // 729be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // The lack of this rule only affects the special case above, because: 730be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // - The only cases where we implicitly bind a socket to a network are the default network and 731be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // the bypassable VPN that applies to the app, if any. 732be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // - This rule doesn't affect VPNs because they don't support permissions at all. 733be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // - The default network doesn't require permissions. While we support doing this, the framework 734be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // never does it (partly because we'd end up in the situation where we tell apps that there is 735be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // a default network, but they can't use it). 736be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // - If the network is still the default network, the presence or absence of this rule does not 737be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // matter. 738be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // 739be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // Therefore, for the lack of this rule to affect a socket, the socket has to have been 740be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // implicitly bound to a network because at the time of connect() it was the default, and that 741be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // network must no longer be the default, and must now require permissions. 742be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti if (permission == PERMISSION_NONE) { 743be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti return modifyImplicitNetworkRule(netId, table, add); 744be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti } 745be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti return 0; 7465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 7474043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 748b8087363143050d214d48e5620a330776ca95a69Robin LeeWARN_UNUSED_RESULT int modifyRejectNonSecureNetworkRule(const UidRanges& uidRanges, bool add) { 749b8087363143050d214d48e5620a330776ca95a69Robin Lee Fwmark fwmark; 750b8087363143050d214d48e5620a330776ca95a69Robin Lee Fwmark mask; 751b8087363143050d214d48e5620a330776ca95a69Robin Lee fwmark.protectedFromVpn = false; 752b8087363143050d214d48e5620a330776ca95a69Robin Lee mask.protectedFromVpn = true; 753b8087363143050d214d48e5620a330776ca95a69Robin Lee 754dc0d578a69cc5a57167a508207e2198590142d51Robin Lee for (const UidRange& range : uidRanges.getRanges()) { 755b8087363143050d214d48e5620a330776ca95a69Robin Lee if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, 756b8087363143050d214d48e5620a330776ca95a69Robin Lee RULE_PRIORITY_PROHIBIT_NON_VPN, FR_ACT_PROHIBIT, RT_TABLE_UNSPEC, 757b8087363143050d214d48e5620a330776ca95a69Robin Lee fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, 758dc0d578a69cc5a57167a508207e2198590142d51Robin Lee range.getStart(), range.getStop())) { 759b8087363143050d214d48e5620a330776ca95a69Robin Lee return ret; 760b8087363143050d214d48e5620a330776ca95a69Robin Lee } 761b8087363143050d214d48e5620a330776ca95a69Robin Lee } 762b8087363143050d214d48e5620a330776ca95a69Robin Lee 763b8087363143050d214d48e5620a330776ca95a69Robin Lee return 0; 764b8087363143050d214d48e5620a330776ca95a69Robin Lee} 765b8087363143050d214d48e5620a330776ca95a69Robin Lee 76602cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::modifyVirtualNetwork(unsigned netId, const char* interface, 76702cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti const UidRanges& uidRanges, 76802cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti bool secure, bool add, 76902cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti bool modifyNonUidBasedRules) { 7705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 7735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 774b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 775dc0d578a69cc5a57167a508207e2198590142d51Robin Lee for (const UidRange& range : uidRanges.getRanges()) { 776dc0d578a69cc5a57167a508207e2198590142d51Robin Lee if (int ret = modifyVpnUidRangeRule(table, range.getStart(), range.getStop(), secure, add)) 777dc0d578a69cc5a57167a508207e2198590142d51Robin Lee { 778fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 779fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 780dc0d578a69cc5a57167a508207e2198590142d51Robin Lee if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.getStart(), 781dc0d578a69cc5a57167a508207e2198590142d51Robin Lee range.getStop(), add)) { 782b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 783b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 784dc0d578a69cc5a57167a508207e2198590142d51Robin Lee if (int ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, 785dc0d578a69cc5a57167a508207e2198590142d51Robin Lee range.getStart(), range.getStop(), add)) { 786b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 787b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 789eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 7905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (modifyNonUidBasedRules) { 7915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 792b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 793b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 794111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran if (int ret = modifyVpnOutputToLocalRule(interface, add)) { 795111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return ret; 796111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran } 79795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) { 798b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 799b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 800fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add); 801b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 8024043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 803b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 8044043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 8054043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 80602cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::modifyDefaultNetwork(uint16_t action, const char* interface, 80702cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti Permission permission) { 8089c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 8095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 81096f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return -ESRCH; 8119c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 8129c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 813122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 814122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 815f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 8165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 817122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 818f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 819f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 820122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 8219c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 8225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 82387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran mask.intValue); 8247619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 8257619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 82602cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::modifyTetheredNetwork(uint16_t action, 82702cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti const char* inputInterface, 82802cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti const char* outputInterface) { 829fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran uint32_t table = getRouteTableForInterface(outputInterface); 830fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 831fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return -ESRCH; 832fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 833fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 834fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, 835fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 836fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 837fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 83892e8f96e43320efd5183d7452fb90883fd96415eLorenzo Colitti// Adds or removes an IPv4 or IPv6 route to the specified table. 839f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// Returns 0 on success or negative errno on failure. 84002cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::modifyRoute(uint16_t action, const char* interface, 84102cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti const char* destination, const char* nexthop, 84202cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti TableType tableType) { 8435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table; 84438b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran switch (tableType) { 84538b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran case RouteController::INTERFACE: { 84638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran table = getRouteTableForInterface(interface); 8475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 8485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 8495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 85038b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 85138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 85287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran case RouteController::LOCAL_NETWORK: { 85387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran table = ROUTE_TABLE_LOCAL_NETWORK; 85487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran break; 85587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 8565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_NETWORK: { 8574acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_NETWORK; 85838b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 85938b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_SYSTEM: { 8614acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_SYSTEM; 86238b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 86338b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 86438b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8659c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 866f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti int ret = modifyIpRoute(action, table, interface, destination, nexthop); 8670321315d4e94dacd5ef2e0de217059cbc72d803dSreeram Ramachandran // Trying to add a route that already exists shouldn't cause an error. 8680321315d4e94dacd5ef2e0de217059cbc72d803dSreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { 869f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 870c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 871c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 872f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return 0; 8739c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 8749c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 875f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo ColittiWARN_UNUSED_RESULT int clearTetheringRules(const char* inputInterface) { 876f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti int ret = 0; 877f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti while (ret == 0) { 878f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti ret = modifyIpRule(RTM_DELRULE, RULE_PRIORITY_TETHERING, 0, MARK_UNSET, MARK_UNSET, 879f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 880f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti } 881f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 882f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti if (ret == -ENOENT) { 883f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return 0; 884f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti } else { 885f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return ret; 886f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti } 887f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti} 888f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 889f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colittiuint32_t getRulePriority(const nlmsghdr *nlh) { 890f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return getRtmU32Attribute(nlh, FRA_PRIORITY); 891f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti} 892f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 893f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colittiuint32_t getRouteTable(const nlmsghdr *nlh) { 894f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return getRtmU32Attribute(nlh, RTA_TABLE); 895f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti} 896f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 897f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo ColittiWARN_UNUSED_RESULT int flushRules() { 898f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti NetlinkDumpFilter shouldDelete = [] (nlmsghdr *nlh) { 899f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti // Don't touch rules at priority 0 because by default they are used for local input. 900f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return getRulePriority(nlh) != 0; 901f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti }; 902f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return rtNetlinkFlush(RTM_GETRULE, RTM_DELRULE, "rules", shouldDelete); 903f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti} 904f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 90502cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::flushRoutes(uint32_t table) { 906f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti NetlinkDumpFilter shouldDelete = [table] (nlmsghdr *nlh) { 907f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return getRouteTable(nlh) == table; 908f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti }; 909f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 910f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return rtNetlinkFlush(RTM_GETROUTE, RTM_DELROUTE, "routes", shouldDelete); 911f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti} 912f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 913f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 91402cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::flushRoutes(const char* interface) { 915107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti android::RWLock::AutoWLock lock(sInterfaceToTableLock); 916107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti 917107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti uint32_t table = getRouteTableForInterfaceLocked(interface); 9185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 919f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ESRCH; 92092b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 92192b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 922f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti int ret = flushRoutes(table); 923357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 92499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // If we failed to flush routes, the caller may elect to keep this interface around, so keep 92599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // track of its name. 926f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti if (ret == 0) { 92702cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti sInterfaceToTable.erase(interface); 92899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } 92999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 93099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti return ret; 93192b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 93292b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 93387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::Init(unsigned localNetId) { 934b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (int ret = flushRules()) { 935b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 936b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 93787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = addLegacyRouteRules()) { 938f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 939f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 940fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addLocalNetworkRules(localNetId)) { 941b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 942f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 943fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addUnreachableRule()) { 94487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 94587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 9463667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // Don't complain if we can't add the dummy network, since not all devices support it. 9473667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti configureDummyNetwork(); 9483667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 9494acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 950f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 9518fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 9528fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 9536a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { 95487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_ADD); 9556a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9566a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9576a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { 95887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_DEL); 9596a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9606a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 9625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9634acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { 9644acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9654acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9664acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9674acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9685c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 9695c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 9705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 9715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 973f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 974f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 9754acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 9764acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9774acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9786b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (int ret = clearTetheringRules(interface)) { 9796b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return ret; 9806b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 9814acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9824acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 983379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 984379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 9855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 98695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 98795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 9884acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 9894acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9904acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9914acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9924acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9934043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 9944043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 9955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 99695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 99795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 9985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 9994043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return ret; 10004043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 10014acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 10024acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 10034acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 10044acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 10054acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 10064043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 10074043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 10085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 10095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission oldPermission, 10105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission newPermission) { 1011379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 10125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 1013f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 1014f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 10155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 1016b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1017b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 1018b8087363143050d214d48e5620a330776ca95a69Robin Leeint RouteController::addUsersToRejectNonSecureNetworkRule(const UidRanges& uidRanges) { 1019b8087363143050d214d48e5620a330776ca95a69Robin Lee return modifyRejectNonSecureNetworkRule(uidRanges, true); 1020b8087363143050d214d48e5620a330776ca95a69Robin Lee} 1021b8087363143050d214d48e5620a330776ca95a69Robin Lee 1022b8087363143050d214d48e5620a330776ca95a69Robin Leeint RouteController::removeUsersFromRejectNonSecureNetworkRule(const UidRanges& uidRanges) { 1023b8087363143050d214d48e5620a330776ca95a69Robin Lee return modifyRejectNonSecureNetworkRule(uidRanges, false); 1024b8087363143050d214d48e5620a330776ca95a69Robin Lee} 1025b8087363143050d214d48e5620a330776ca95a69Robin Lee 102695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranint RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure, 10275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 102895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 10295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 1030b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1031b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 10325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 103395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 103495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 10355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 10369c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10379c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 10395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 10409c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10419c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 10435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 10445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 10455c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 10467619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1047f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 1048eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran TableType tableType) { 1049eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 10507619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 10517619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1052f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colittiint RouteController::removeRoute(const char* interface, const char* destination, 1053eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, TableType tableType) { 1054eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 10557619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 105687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 105787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { 1058fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface); 105987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 106087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 106187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { 1062fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface); 106387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 106448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 106548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface, 106648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 106748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission); 106848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 106948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 107048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId, 107148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 107248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 107348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission); 107448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 10757035f228d17e925116b1b64a7c917b3196ab8818Lorenzo Colitti 1076107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti// Protects sInterfaceToTable. 1077107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colittiandroid::RWLock RouteController::sInterfaceToTableLock; 1078107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti 107902cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colittistd::map<std::string, uint32_t> RouteController::sInterfaceToTable; 108002cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti 10817035f228d17e925116b1b64a7c917b3196ab8818Lorenzo Colitti} // namespace net 10827035f228d17e925116b1b64a7c917b3196ab8818Lorenzo Colitti} // namespace android 1083