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; 155acbb6b7bbea17c5653929ee5224bd4f8e16c0f69Rubin Xu} 156acbb6b7bbea17c5653929ee5224bd4f8e16c0f69Rubin Xu 157acbb6b7bbea17c5653929ee5224bd4f8e16c0f69Rubin Xuuint32_t RouteController::getIfIndex(const char* interface) { 158acbb6b7bbea17c5653929ee5224bd4f8e16c0f69Rubin Xu android::RWLock::AutoRLock lock(sInterfaceToTableLock); 159acbb6b7bbea17c5653929ee5224bd4f8e16c0f69Rubin Xu 160acbb6b7bbea17c5653929ee5224bd4f8e16c0f69Rubin Xu auto iter = sInterfaceToTable.find(interface); 161acbb6b7bbea17c5653929ee5224bd4f8e16c0f69Rubin Xu if (iter == sInterfaceToTable.end()) { 162acbb6b7bbea17c5653929ee5224bd4f8e16c0f69Rubin Xu ALOGE("getIfIndex: cannot find interface %s", interface); 163acbb6b7bbea17c5653929ee5224bd4f8e16c0f69Rubin Xu return 0; 164acbb6b7bbea17c5653929ee5224bd4f8e16c0f69Rubin Xu } 165acbb6b7bbea17c5653929ee5224bd4f8e16c0f69Rubin Xu 166acbb6b7bbea17c5653929ee5224bd4f8e16c0f69Rubin Xu return iter->second - ROUTE_TABLE_OFFSET_FROM_INDEX; 1674acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1684acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 169107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colittiuint32_t RouteController::getRouteTableForInterface(const char* interface) { 170107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti android::RWLock::AutoRLock lock(sInterfaceToTableLock); 171107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti return getRouteTableForInterfaceLocked(interface); 172107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti} 173107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti 1744acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid addTableName(uint32_t table, const std::string& name, std::string* contents) { 1754acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran char tableString[UINT32_STRLEN]; 1764acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran snprintf(tableString, sizeof(tableString), "%u", table); 1774acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += tableString; 1784acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += " "; 1794acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += name; 1804acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += "\n"; 1814acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1824acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1834acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// Doesn't return success/failure as the file is optional; it's okay if we fail to update it. 18402cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colittivoid RouteController::updateTableNamesFile() { 1854acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran std::string contents; 186bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 187bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents); 188bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents); 189bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 19087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents); 1914acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); 1924acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); 193bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 194107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti android::RWLock::AutoRLock lock(sInterfaceToTableLock); 19502cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti for (const auto& entry : sInterfaceToTable) { 1964acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(entry.second, entry.first, &contents); 1974acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1984acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1995407e14fd3d81bb76f94221b4a359faa2806de65Dan Albert if (!WriteStringToFile(contents, RT_TABLES_PATH, RT_TABLES_MODE, AID_SYSTEM, AID_WIFI)) { 200bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes ALOGE("failed to write to %s (%s)", RT_TABLES_PATH, strerror(errno)); 2014acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return; 202a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen } 2035c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 2045c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 20587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 20687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { 20787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (!input) { 20887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = 0; 20987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = 0; 21087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 21187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 21287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = strlcpy(name, input, IFNAMSIZ) + 1; 21387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (*length > IFNAMSIZ) { 21487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); 21587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return -ENAMETOOLONG; 21687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 21787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); 21887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 21987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 22087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 2218fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 2228fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 2236b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the table is 2244ef94642636182e68495f606a65c00f8a830aad4Robin Lee// unspecified. An unspecified table is not allowed when creating an FR_ACT_TO_TBL rule. 2258fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 2268fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 22787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |iif| is non-NULL, the rule matches the specified incoming interface. 22887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |oif| is non-NULL, the rule matches the specified outgoing interface. 22987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that 23087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// range (inclusive). Otherwise, the rule matches packets from all UIDs. 23196f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// 23296f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// Returns 0 on success or negative errno on failure. 2334ef94642636182e68495f606a65c00f8a830aad4Robin LeeWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint8_t ruleType, 2344ef94642636182e68495f606a65c00f8a830aad4Robin Lee uint32_t table, uint32_t fwmark, uint32_t mask, const char* iif, 23587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran const char* oif, uid_t uidStart, uid_t uidEnd) { 236f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 237f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (fwmark & ~mask) { 238f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 239f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ERANGE; 240f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 241f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 24287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran // Interface names must include exactly one terminating NULL and be properly padded, or older 2434753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // kernels will refuse to delete rules. 24487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; 24587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran size_t iifLength, oifLength; 24687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint16_t iifPadding, oifPadding; 24787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { 24887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 24987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 25087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { 25187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 2524753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2537619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2545965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti // Either both start and end UID must be specified, or neither. 255f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 256cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 2575965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti return -EUSERS; 2585965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti } 2594ef94642636182e68495f606a65c00f8a830aad4Robin Lee 26072723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti bool isUidRule = (uidStart != INVALID_UID); 2615965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 2624753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rule request and put it in an array of iovec structures. 2634753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti fib_rule_hdr rule = { 2644ef94642636182e68495f606a65c00f8a830aad4Robin Lee .action = ruleType, 2656b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // Note that here we're implicitly setting rule.table to 0. When we want to specify a 2666b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // non-zero table, we do this via the FRATTR_TABLE attribute. 2674753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 268a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 2696b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // Don't ever create a rule that looks up table 0, because table 0 is the local table. 2706b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // It's OK to specify a table ID of 0 when deleting a rule, because that doesn't actually select 2716b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // table 0, it's a wildcard that matches anything. 2726b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (table == RT_TABLE_UNSPEC && rule.action == FR_ACT_TO_TBL && action != RTM_DELRULE) { 2736b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti ALOGE("RT_TABLE_UNSPEC only allowed when deleting rules"); 2746b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return -ENOTUNIQ; 2756b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 2766b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti 27787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; 27887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; 2792b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colitti struct fib_rule_uid_range uidRange = { uidStart, uidEnd }; 280a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 2814753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iovec iov[] = { 282f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 283f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rule, sizeof(rule) }, 284f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 285f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &priority, sizeof(priority) }, 2865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 2875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 288f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 289f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &fwmark, mask ? sizeof(fwmark) : 0 }, 290f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 291f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &mask, mask ? sizeof(mask) : 0 }, 2922b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colitti { &FRATTR_UID_RANGE, isUidRule ? sizeof(FRATTR_UID_RANGE) : 0 }, 2932b078678aafceeefea6a70e96ab8ddefe515d027Lorenzo Colitti { &uidRange, isUidRule ? sizeof(uidRange) : 0 }, 29487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, 29587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { iifName, iifLength }, 29687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, iifPadding }, 29787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, 29887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { oifName, oifLength }, 29987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, oifPadding }, 3004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 3014753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 3025c43799a4bc53d0db6f06e6b0a93914956428ca6Lorenzo Colitti uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_RULE_CREATE_FLAGS : NETLINK_REQUEST_FLAGS; 303f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 304f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rule.family = AF_FAMILIES[i]; 305f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov), nullptr)) { 306220ca739ad863fcd40c9ca107f6e0f68f7a45d14Lorenzo Colitti if (!(action == RTM_DELRULE && ret == -ENOENT && priority == RULE_PRIORITY_TETHERING)) { 307220ca739ad863fcd40c9ca107f6e0f68f7a45d14Lorenzo Colitti // Don't log when deleting a tethering rule that's not there. This matches the 308220ca739ad863fcd40c9ca107f6e0f68f7a45d14Lorenzo Colitti // behaviour of clearTetheringRules, which ignores ENOENT in this case. 309220ca739ad863fcd40c9ca107f6e0f68f7a45d14Lorenzo Colitti ALOGE("Error %s %s rule: %s", actionName(action), familyName(rule.family), 310220ca739ad863fcd40c9ca107f6e0f68f7a45d14Lorenzo Colitti strerror(-ret)); 311220ca739ad863fcd40c9ca107f6e0f68f7a45d14Lorenzo Colitti } 31296f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return ret; 3135c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3145c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3155c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 31696f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return 0; 3175c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 3185c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 31987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 3204ef94642636182e68495f606a65c00f8a830aad4Robin Lee uint32_t fwmark, uint32_t mask, const char* iif, 3214ef94642636182e68495f606a65c00f8a830aad4Robin Lee const char* oif, uid_t uidStart, uid_t uidEnd) { 3224ef94642636182e68495f606a65c00f8a830aad4Robin Lee return modifyIpRule(action, priority, FR_ACT_TO_TBL, table, fwmark, mask, iif, oif, uidStart, 3234ef94642636182e68495f606a65c00f8a830aad4Robin Lee uidEnd); 3244ef94642636182e68495f606a65c00f8a830aad4Robin Lee} 3254ef94642636182e68495f606a65c00f8a830aad4Robin Lee 3264ef94642636182e68495f606a65c00f8a830aad4Robin LeeWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 32787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask) { 32887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, 32987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID); 33087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 33187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 332ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Adds or deletes an IPv4 or IPv6 route. 333ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Returns 0 on success or negative errno on failure. 334f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 335f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran const char* destination, const char* nexthop) { 336ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // At least the destination must be non-null. 337ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!destination) { 338f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("null destination"); 339ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EFAULT; 340ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 341ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 342ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // Parse the prefix. 343ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawAddress[sizeof(in6_addr)]; 344f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t family; 345f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t prefixLength; 346ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 347ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti &prefixLength); 348ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (rawLength < 0) { 349f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 350ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return rawLength; 351ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 3527619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 353ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 3541201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 355ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 356ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 357ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 358de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t type = RTN_UNICAST; 359ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint32_t ifindex; 360de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t rawNexthop[sizeof(in6_addr)]; 361de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran 362de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && !strcmp(nexthop, "unreachable")) { 363de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran type = RTN_UNREACHABLE; 364de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup 365de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for 366de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.) 367de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran interface = OIF_NONE; 368de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran nexthop = NULL; 3694c95a125e0930c112555437589f7620575482095Lorenzo Colitti } else if (nexthop && !strcmp(nexthop, "throw")) { 3704c95a125e0930c112555437589f7620575482095Lorenzo Colitti type = RTN_THROW; 3714c95a125e0930c112555437589f7620575482095Lorenzo Colitti interface = OIF_NONE; 3724c95a125e0930c112555437589f7620575482095Lorenzo Colitti nexthop = NULL; 373de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } else { 374de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If an interface was specified, find the ifindex. 375de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (interface != OIF_NONE) { 376de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ifindex = if_nametoindex(interface); 377de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (!ifindex) { 378de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 379de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -ENODEV; 380de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 3817619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 3827619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 383de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If a nexthop was specified, parse it as the same family as the prefix. 384de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 385de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("inet_pton failed for nexthop %s", nexthop); 386de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -EINVAL; 387de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 388ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 389ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 3905e03a893d999d04b7329ab8825782d75872d680fLorenzo Colitti bool isDefaultThrowRoute = (type == RTN_THROW && prefixLength == 0); 3915e03a893d999d04b7329ab8825782d75872d680fLorenzo Colitti 3924753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rtmsg and put it in an array of iovec structures. 393f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtmsg route = { 394ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_protocol = RTPROT_STATIC, 395de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran .rtm_type = type, 396ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_family = family, 397ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_dst_len = prefixLength, 3982bff72e0cf091f4d71af0c81cfc74e8ebd8c6644Sreeram Ramachandran .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK), 399ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 4004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 401f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 402f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 403ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 404ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti iovec iov[] = { 405f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 406f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &route, sizeof(route) }, 407f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 408f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &table, sizeof(table) }, 409f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaDst, sizeof(rtaDst) }, 410f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawAddress, static_cast<size_t>(rawLength) }, 4115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 4125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 413f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 414f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 4155e03a893d999d04b7329ab8825782d75872d680fLorenzo Colitti { &RTATTR_PRIO, isDefaultThrowRoute ? sizeof(RTATTR_PRIO) : 0 }, 4165e03a893d999d04b7329ab8825782d75872d680fLorenzo Colitti { &PRIO_THROW, isDefaultThrowRoute ? sizeof(PRIO_THROW) : 0 }, 417ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 418ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 4195c43799a4bc53d0db6f06e6b0a93914956428ca6Lorenzo Colitti uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_ROUTE_CREATE_FLAGS : NETLINK_REQUEST_FLAGS; 420f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov), nullptr); 4210b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti if (ret) { 4220b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti ALOGE("Error %s route %s -> %s %s to table %u: %s", 4230b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti actionName(action), destination, nexthop, interface, table, strerror(-ret)); 4240b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti } 4250b073fbc366ca9f5e7eaa0ae8072445404da88ebLorenzo Colitti return ret; 4267619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 4277619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 4285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// An iptables rule to mark incoming packets on a network with the netId of the network. 4295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is so that the kernel can: 4315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 4325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// replies, SYN-ACKs, etc). 4335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Mark sockets that accept connections from this interface so that the connection stays on the 4345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// same interface. 4355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 4365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 4405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = true; 4425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 444b9baf26777415ce2791fd86f4dd359ac7aab596cBenedict Wong const uint32_t mask = ~Fwmark::getUidBillingMask(); 445b9baf26777415ce2791fd86f4dd359ac7aab596cBenedict Wong 446b9baf26777415ce2791fd86f4dd359ac7aab596cBenedict Wong std::string cmd = StringPrintf( 447b9baf26777415ce2791fd86f4dd359ac7aab596cBenedict Wong "%s %s -i %s -j MARK --set-mark 0x%x/0x%x", add ? "-A" : "-D", 448b9baf26777415ce2791fd86f4dd359ac7aab596cBenedict Wong RouteController::LOCAL_MANGLE_INPUT, interface, fwmark.intValue, mask); 449c1306ea230c95ef0268d4d20a213911799982671Lorenzo Colitti if (RouteController::iptablesRestoreCommandFunction(V4V6, "mangle", cmd, nullptr) != 0) { 450b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran ALOGE("failed to change iptables rule that sets incoming packet mark"); 451b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return -EREMOTEIO; 452b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 4535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 454b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 455b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 456b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 457111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// A rule to route responses to the local network forwarded via the VPN. 458111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// 459111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// When a VPN is in effect, packets from the local network to upstream networks are forwarded into 460111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel. 461111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) { 462111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL, 463111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE, 464111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran INVALID_UID, INVALID_UID); 465111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran} 466111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran 467fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to route all traffic from a given set of UIDs to go over the VPN. 468fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 469fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 470fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 471fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// bypass the VPN if the protectedFromVpn bit is set. 472fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 47395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, bool add) { 474fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 475fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 476fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 477fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.protectedFromVpn = false; 478fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.protectedFromVpn = true; 479fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 48095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority; 48195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 48295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (secure) { 48395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_SECURE_VPN; 48495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } else { 48595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_BYPASSABLE_VPN; 48695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 48795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran fwmark.explicitlySelected = false; 48895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.explicitlySelected = true; 48995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } 49095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 49195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 4925ad4e98f7b566ffde39491ee4e80d4a15507f053Lorenzo Colitti mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd); 493fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 494fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 495fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 496fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// set of UIDs. 497fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 498fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 499fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// target set, but where the DnsProxyListener itself is not. 50095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure, 50195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool add) { 502fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 503fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 504fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 505fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.netId = netId; 506fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 507fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 508fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 509fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 510fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 51195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN; 51295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 51395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 51495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue); 515fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 516fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 5175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on an explicitly chosen network. 5185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 5205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 5225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// to check it again in the rules here, because a network's permissions may have been updated via 5235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// modifyNetworkPermission(). 5245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 5255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 527eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark fwmark; 528eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark mask; 529eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 530eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran fwmark.netId = netId; 531eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 532eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 5345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 535eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 5385c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 540dcb11893d76effcd0fdea1efc44610d64ea40f12Lorenzo Colitti fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd); 5415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5425c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on a chosen outgoing interface. 5445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 5465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// the outgoing interface (typically for link-local communications). 54757947f02c00bb03651e3f9427c880211c689db7fLorenzo ColittiWARN_UNUSED_RESULT int modifyOutputInterfaceRules(const char* interface, uint32_t table, 54857947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti Permission permission, uid_t uidStart, 54957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti uid_t uidEnd, bool add) { 550122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 551122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 5525c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 553f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 554f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran mask.permission = permission; 5555c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 55657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti // If this rule does not specify a UID range, then also add a corresponding high-priority rule 557dcb11893d76effcd0fdea1efc44610d64ea40f12Lorenzo Colitti // for root. This covers kernel-originated packets, TEEd packets and any local daemons that open 558dcb11893d76effcd0fdea1efc44610d64ea40f12Lorenzo Colitti // sockets as root. 55957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (uidStart == INVALID_UID && uidEnd == INVALID_UID) { 56057947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OVERRIDE_OIF, 561dcb11893d76effcd0fdea1efc44610d64ea40f12Lorenzo Colitti table, FWMARK_NONE, MASK_NONE, IIF_LOOPBACK, interface, 56257947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti UID_ROOT, UID_ROOT)) { 56357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti return ret; 56457947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti } 56557947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti } 56657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti 5675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 568dcb11893d76effcd0fdea1efc44610d64ea40f12Lorenzo Colitti fwmark.intValue, mask.intValue, IIF_LOOPBACK, interface, uidStart, uidEnd); 5695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on the chosen network. 5725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is for sockets that have not explicitly requested a particular network, but have been 5745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bound to one when they called connect(). This ensures that sockets connected on a particular 5755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// network stay on that network even if the default network changes. 576be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo ColittiWARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, bool add) { 5775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 580122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 581122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 582122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 5835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 584122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 5855c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 586be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti fwmark.permission = PERMISSION_NONE; 587be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti mask.permission = PERMISSION_NONE; 588eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 590dcb11893d76effcd0fdea1efc44610d64ea40f12Lorenzo Colitti fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, INVALID_UID, 591dcb11893d76effcd0fdea1efc44610d64ea40f12Lorenzo Colitti INVALID_UID); 5925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5935c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 59448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// A rule to enable split tunnel VPNs. 59548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// 59648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to 59748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// go over the default network, provided it wasn't explicitly restricted to the VPN and has the 59848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// permissions required by the default network. 59902cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId, 60002cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti const char* physicalInterface, 60102cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti Permission permission) { 60248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran uint32_t table = getRouteTableForInterface(physicalInterface); 60348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 60448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return -ESRCH; 60548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran } 60648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 60748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark fwmark; 60848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark mask; 60948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 61048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.netId = vpnNetId; 61148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 61248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 61348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.explicitlySelected = false; 61448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.explicitlySelected = true; 61548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 61648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.permission = permission; 61748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.permission = permission; 61848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 61948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue, 62048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.intValue); 62148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 62248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 623fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to allow legacy routes added through the requestRouteToHost() API. 624fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLegacyRouteRules() { 6255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 628fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 629fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 631fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // Rules to allow legacy routes to override the default network. 632fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 633fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue)) { 634fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 635fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 636fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 637fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { 638fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 639fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 640fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 641fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 642fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 643fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 644fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // A rule to allow legacy routes from system apps to override VPNs. 645fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 646fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue); 6475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 649fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to lookup the local network when specified explicitly or otherwise. 650fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) { 651fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 652fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran INVALID_UID, INVALID_UID, ACTION_ADD)) { 653fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 654fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 655fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 6565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 659fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 660fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 662fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, 66387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 6645c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 6655c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 66602cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti/* static */ 66702cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colittiint RouteController::configureDummyNetwork() { 6683667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti const char *interface = DummyNetwork::INTERFACE_NAME; 6693667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti uint32_t table = getRouteTableForInterface(interface); 6703667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (table == RT_TABLE_UNSPEC) { 6713667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // getRouteTableForInterface has already looged an error. 6723667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -ESRCH; 6733667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6743667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6753667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_init(); 6763667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti int ret = ifc_up(interface); 6773667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_close(); 6783667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (ret) { 6793667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't bring up %s: %s", interface, strerror(errno)); 6803667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -errno; 6813667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6823667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 68357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if ((ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, 68457947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti INVALID_UID, INVALID_UID, ACTION_ADD))) { 68557947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti ALOGE("Can't create oif rules for %s: %s", interface, strerror(-ret)); 6863667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6873667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6883667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6893667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "0.0.0.0/0", NULL))) { 6903667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6913667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6923667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6933667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "::/0", NULL))) { 6943667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6953667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6963667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6973667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return 0; 6983667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti} 6993667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 700db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that 701db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended 702db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable 703db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule will hopefully make things even clearer. 704fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addUnreachableRule() { 705c125fe43c194128167db7a2a82b736b1357945d8Robin Lee return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, FR_ACT_UNREACHABLE, RT_TABLE_UNSPEC, 706c125fe43c194128167db7a2a82b736b1357945d8Robin Lee MARK_UNSET, MARK_UNSET, IIF_NONE, OIF_NONE, INVALID_UID, INVALID_UID); 70787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 70887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 70987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { 7106a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 7116a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 7126a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 71357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti return modifyOutputInterfaceRules(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 71457947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti INVALID_UID, INVALID_UID, add); 7156a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 7166a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 71702cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti/* static */ 71802cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::modifyPhysicalNetwork(unsigned netId, const char* interface, 71902cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti Permission permission, bool add) { 7204043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7224043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return -ESRCH; 7234043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 7244043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 7265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 7295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 73257947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyOutputInterfaceRules(interface, table, permission, INVALID_UID, INVALID_UID, 7335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 736be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti 737be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // Only set implicit rules for networks that don't require permissions. 738be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // 739be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // This is so that if the default network ceases to be the default network and then switches 740be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // from requiring no permissions to requiring permissions, we ensure that apps only use the 741be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // network if they explicitly select it. This is consistent with destroySocketsLackingPermission 742be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // - it closes all sockets on the network except sockets that are explicitly selected. 743be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // 744be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // The lack of this rule only affects the special case above, because: 745be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // - The only cases where we implicitly bind a socket to a network are the default network and 746be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // the bypassable VPN that applies to the app, if any. 747be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // - This rule doesn't affect VPNs because they don't support permissions at all. 748be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // - The default network doesn't require permissions. While we support doing this, the framework 749be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // never does it (partly because we'd end up in the situation where we tell apps that there is 750be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // a default network, but they can't use it). 751be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // - If the network is still the default network, the presence or absence of this rule does not 752be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // matter. 753be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // 754be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // Therefore, for the lack of this rule to affect a socket, the socket has to have been 755be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // implicitly bound to a network because at the time of connect() it was the default, and that 756be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti // network must no longer be the default, and must now require permissions. 757be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti if (permission == PERMISSION_NONE) { 758be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti return modifyImplicitNetworkRule(netId, table, add); 759be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti } 760be0c7c3c7aae8c76a55e77fcdc3576475d1cc10eLorenzo Colitti return 0; 7615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 7624043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 763b8087363143050d214d48e5620a330776ca95a69Robin LeeWARN_UNUSED_RESULT int modifyRejectNonSecureNetworkRule(const UidRanges& uidRanges, bool add) { 764b8087363143050d214d48e5620a330776ca95a69Robin Lee Fwmark fwmark; 765b8087363143050d214d48e5620a330776ca95a69Robin Lee Fwmark mask; 766b8087363143050d214d48e5620a330776ca95a69Robin Lee fwmark.protectedFromVpn = false; 767b8087363143050d214d48e5620a330776ca95a69Robin Lee mask.protectedFromVpn = true; 768b8087363143050d214d48e5620a330776ca95a69Robin Lee 769dc0d578a69cc5a57167a508207e2198590142d51Robin Lee for (const UidRange& range : uidRanges.getRanges()) { 770b8087363143050d214d48e5620a330776ca95a69Robin Lee if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, 771b8087363143050d214d48e5620a330776ca95a69Robin Lee RULE_PRIORITY_PROHIBIT_NON_VPN, FR_ACT_PROHIBIT, RT_TABLE_UNSPEC, 772b8087363143050d214d48e5620a330776ca95a69Robin Lee fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, 773dc0d578a69cc5a57167a508207e2198590142d51Robin Lee range.getStart(), range.getStop())) { 774b8087363143050d214d48e5620a330776ca95a69Robin Lee return ret; 775b8087363143050d214d48e5620a330776ca95a69Robin Lee } 776b8087363143050d214d48e5620a330776ca95a69Robin Lee } 777b8087363143050d214d48e5620a330776ca95a69Robin Lee 778b8087363143050d214d48e5620a330776ca95a69Robin Lee return 0; 779b8087363143050d214d48e5620a330776ca95a69Robin Lee} 780b8087363143050d214d48e5620a330776ca95a69Robin Lee 78102cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::modifyVirtualNetwork(unsigned netId, const char* interface, 78202cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti const UidRanges& uidRanges, 78302cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti bool secure, bool add, 78402cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti bool modifyNonUidBasedRules) { 7855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 7885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 789b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 790dc0d578a69cc5a57167a508207e2198590142d51Robin Lee for (const UidRange& range : uidRanges.getRanges()) { 791dc0d578a69cc5a57167a508207e2198590142d51Robin Lee if (int ret = modifyVpnUidRangeRule(table, range.getStart(), range.getStop(), secure, add)) 792dc0d578a69cc5a57167a508207e2198590142d51Robin Lee { 793fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 794fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 795dc0d578a69cc5a57167a508207e2198590142d51Robin Lee if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.getStart(), 796dc0d578a69cc5a57167a508207e2198590142d51Robin Lee range.getStop(), add)) { 797b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 798b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 799dc0d578a69cc5a57167a508207e2198590142d51Robin Lee if (int ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, 800dc0d578a69cc5a57167a508207e2198590142d51Robin Lee range.getStart(), range.getStop(), add)) { 801b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 802b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 8035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 804eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 8055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (modifyNonUidBasedRules) { 8065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 807b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 808b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 809111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran if (int ret = modifyVpnOutputToLocalRule(interface, add)) { 810111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return ret; 811111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran } 81295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) { 813b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 814b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 815fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add); 816b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 8174043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 818b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 8194043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 8204043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 82102cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::modifyDefaultNetwork(uint16_t action, const char* interface, 82202cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti Permission permission) { 8239c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 8245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 82596f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return -ESRCH; 8269c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 8279c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 828122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 829122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 830f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 8315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 832122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 833f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 834f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 835122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 8369c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 8375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 838dcb11893d76effcd0fdea1efc44610d64ea40f12Lorenzo Colitti mask.intValue, IIF_LOOPBACK, OIF_NONE, INVALID_UID, INVALID_UID); 8397619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 8407619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 84102cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::modifyTetheredNetwork(uint16_t action, 84202cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti const char* inputInterface, 84302cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti const char* outputInterface) { 844fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran uint32_t table = getRouteTableForInterface(outputInterface); 845fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 846fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return -ESRCH; 847fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 848fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 849fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, 850fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 851fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 852fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 85392e8f96e43320efd5183d7452fb90883fd96415eLorenzo Colitti// Adds or removes an IPv4 or IPv6 route to the specified table. 854f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// Returns 0 on success or negative errno on failure. 85502cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::modifyRoute(uint16_t action, const char* interface, 85602cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti const char* destination, const char* nexthop, 85702cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti TableType tableType) { 8585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table; 85938b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran switch (tableType) { 86038b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran case RouteController::INTERFACE: { 86138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran table = getRouteTableForInterface(interface); 8625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 8635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 8645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 86538b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 86638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 86787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran case RouteController::LOCAL_NETWORK: { 86887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran table = ROUTE_TABLE_LOCAL_NETWORK; 86987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran break; 87087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 8715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_NETWORK: { 8724acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_NETWORK; 87338b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 87438b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_SYSTEM: { 8764acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_SYSTEM; 87738b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 87838b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 87938b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8809c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 881f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti int ret = modifyIpRoute(action, table, interface, destination, nexthop); 8820321315d4e94dacd5ef2e0de217059cbc72d803dSreeram Ramachandran // Trying to add a route that already exists shouldn't cause an error. 8830321315d4e94dacd5ef2e0de217059cbc72d803dSreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { 884f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 885c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 886c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 887f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return 0; 8889c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 8899c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 890f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo ColittiWARN_UNUSED_RESULT int clearTetheringRules(const char* inputInterface) { 891f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti int ret = 0; 892f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti while (ret == 0) { 893f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti ret = modifyIpRule(RTM_DELRULE, RULE_PRIORITY_TETHERING, 0, MARK_UNSET, MARK_UNSET, 894f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 895f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti } 896f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 897f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti if (ret == -ENOENT) { 898f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return 0; 899f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti } else { 900f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return ret; 901f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti } 902f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti} 903f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 904f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colittiuint32_t getRulePriority(const nlmsghdr *nlh) { 905f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return getRtmU32Attribute(nlh, FRA_PRIORITY); 906f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti} 907f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 908f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colittiuint32_t getRouteTable(const nlmsghdr *nlh) { 909f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return getRtmU32Attribute(nlh, RTA_TABLE); 910f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti} 911f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 912f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo ColittiWARN_UNUSED_RESULT int flushRules() { 913f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti NetlinkDumpFilter shouldDelete = [] (nlmsghdr *nlh) { 914f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti // Don't touch rules at priority 0 because by default they are used for local input. 915f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return getRulePriority(nlh) != 0; 916f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti }; 917f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return rtNetlinkFlush(RTM_GETRULE, RTM_DELRULE, "rules", shouldDelete); 918f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti} 919f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 92002cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::flushRoutes(uint32_t table) { 921f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti NetlinkDumpFilter shouldDelete = [table] (nlmsghdr *nlh) { 922f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return getRouteTable(nlh) == table; 923f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti }; 924f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 925f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti return rtNetlinkFlush(RTM_GETROUTE, RTM_DELROUTE, "routes", shouldDelete); 926f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti} 927f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti 928f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 92902cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo ColittiWARN_UNUSED_RESULT int RouteController::flushRoutes(const char* interface) { 930107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti android::RWLock::AutoWLock lock(sInterfaceToTableLock); 931107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti 932107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti uint32_t table = getRouteTableForInterfaceLocked(interface); 9335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 934f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ESRCH; 93592b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 93692b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 937f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti int ret = flushRoutes(table); 938357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 93999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // If we failed to flush routes, the caller may elect to keep this interface around, so keep 94099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // track of its name. 941f3e299a7c2a0136a84b58652b69e60a22bb0e708Lorenzo Colitti if (ret == 0) { 94202cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti sInterfaceToTable.erase(interface); 94399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } 94499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 94599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti return ret; 94692b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 94792b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 94887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::Init(unsigned localNetId) { 949b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (int ret = flushRules()) { 950b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 951b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 95287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = addLegacyRouteRules()) { 953f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 954f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 955fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addLocalNetworkRules(localNetId)) { 956b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 957f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 958fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addUnreachableRule()) { 95987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 96087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 9613667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // Don't complain if we can't add the dummy network, since not all devices support it. 9623667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti configureDummyNetwork(); 9633667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 9644acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 965f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 9668fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 9678fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 9686a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { 96987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_ADD); 9706a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9716a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9726a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { 97387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_DEL); 9746a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9756a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 9775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9784acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { 9794acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9804acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9814acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9824acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9835c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 9845c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 9855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 9865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 988f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 989f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 9904acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 9914acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9924acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9936b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (int ret = clearTetheringRules(interface)) { 9946b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return ret; 9956b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 9964acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9974acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 998379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 999379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 10005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 100195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 100295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 10034acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 10044acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 10054acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 10064acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 10074acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 10084043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 10094043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 10105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 101195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 101295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 10135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 10144043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return ret; 10154043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 10164acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 10174acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 10184acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 10194acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 10204acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 10214043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 10224043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 10235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 10245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission oldPermission, 10255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission newPermission) { 1026379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 10275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 1028f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 1029f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 10305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 1031b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1032b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 1033b8087363143050d214d48e5620a330776ca95a69Robin Leeint RouteController::addUsersToRejectNonSecureNetworkRule(const UidRanges& uidRanges) { 1034b8087363143050d214d48e5620a330776ca95a69Robin Lee return modifyRejectNonSecureNetworkRule(uidRanges, true); 1035b8087363143050d214d48e5620a330776ca95a69Robin Lee} 1036b8087363143050d214d48e5620a330776ca95a69Robin Lee 1037b8087363143050d214d48e5620a330776ca95a69Robin Leeint RouteController::removeUsersFromRejectNonSecureNetworkRule(const UidRanges& uidRanges) { 1038b8087363143050d214d48e5620a330776ca95a69Robin Lee return modifyRejectNonSecureNetworkRule(uidRanges, false); 1039b8087363143050d214d48e5620a330776ca95a69Robin Lee} 1040b8087363143050d214d48e5620a330776ca95a69Robin Lee 104195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranint RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure, 10425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 104395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 10445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 1045b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1046b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 10475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 104895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 104995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 10505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 10519c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10529c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 10545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 10559c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10569c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 10585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 10595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 10605c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 10617619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1062f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 1063eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran TableType tableType) { 1064eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 10657619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 10667619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1067f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colittiint RouteController::removeRoute(const char* interface, const char* destination, 1068eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, TableType tableType) { 1069eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 10707619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 107187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 107287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { 1073fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface); 107487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 107587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 107687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { 1077fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface); 107887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 107948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 108048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface, 108148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 108248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission); 108348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 108448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 108548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId, 108648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 108748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 108848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission); 108948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 10907035f228d17e925116b1b64a7c917b3196ab8818Lorenzo Colitti 1091107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti// Protects sInterfaceToTable. 1092107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colittiandroid::RWLock RouteController::sInterfaceToTableLock; 1093107075a48973c18a087a5cb2ad2ad43e73f9909aLorenzo Colitti 109402cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colittistd::map<std::string, uint32_t> RouteController::sInterfaceToTable; 109502cb80a71afbbe89e3ced8b417b2abe7578dbc82Lorenzo Colitti 10967035f228d17e925116b1b64a7c917b3196ab8818Lorenzo Colitti} // namespace net 10977035f228d17e925116b1b64a7c917b3196ab8818Lorenzo Colitti} // namespace android 1098