RouteController.cpp revision 48e19b037e7e20674048ef76bf31ce65c741347c
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 195c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "Fwmark.h" 20b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran#include "UidRanges.h" 21f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 22f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#define LOG_TAG "Netd" 23f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "log/log.h" 24f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "logwrap/logwrap.h" 255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran#include "resolv_netid.h" 265c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 27ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti#include <arpa/inet.h> 284acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran#include <fcntl.h> 294753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti#include <linux/fib_rules.h> 30a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen#include <map> 315c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include <net/if.h> 324acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran#include <sys/stat.h> 335c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 345c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandrannamespace { 355c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 36f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// BEGIN CONSTANTS -------------------------------------------------------------------------------- 37f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000; 39111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL = 11000; 405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_SECURE_VPN = 12000; 415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; 425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; 435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; 445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; 456a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranconst uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; 4687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t RULE_PRIORITY_TETHERING = 18000; 475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000; 4895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranconst uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000; 4948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000; 505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; 515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000; 525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_UNREACHABLE = 24000; 535c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97; 554acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98; 564acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99; 574acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 5887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network"; 594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network"; 604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system"; 614acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 62bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL = "local"; 63bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_MAIN = "main"; 64bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 655965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not 665965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make 675965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert 685965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// that will warn us if upstream has given these values some other meaning. 695965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_START = 18; 705965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_END = 19; 715965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colittistatic_assert(FRA_UID_START > FRA_MAX, 725965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. " 735965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Check that these values match what the kernel does and then update this assertion."); 745965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 7572723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK; 7672723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL; 774753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 78f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0}; 79f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 80f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; 81f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 82f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst char* const IP_VERSIONS[] = {"-4", "-6"}; 83f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uid_t UID_ROOT = 0; 8587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const IIF_NONE = NULL; 865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst char* const OIF_NONE = NULL; 875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_ADD = true; 885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_DEL = false; 895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool MODIFY_NON_UID_BASED_RULES = true; 905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 914acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 92c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst int RT_TABLES_FLAGS = O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW | O_CLOEXEC; 93c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r-- 944acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 95f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" 96f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). 97f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconstexpr uint16_t U16_RTA_LENGTH(uint16_t x) { 98f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return RTA_LENGTH(x); 99f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran} 100f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 101f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// These are practically const, but can't be declared so, because they are used to initialize 102f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// non-const pointers ("void* iov_base") in iovec arrays. 103f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; 104f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; 105f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; 106f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; 107f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START }; 108f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END }; 109f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 110f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; 111f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; 112f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 113f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranuint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; 114f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 115f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// END CONSTANTS ---------------------------------------------------------------------------------- 116f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 1174acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// No locks needed because RouteController is accessed only from one thread (in CommandListener). 1184acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranstd::map<std::string, uint32_t> interfaceToTable; 119a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen 1205c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranuint32_t getRouteTableForInterface(const char* interface) { 121a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran uint32_t index = if_nametoindex(interface); 122a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen if (index) { 1234acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; 1244acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran interfaceToTable[interface] = index; 1254acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return index; 1264acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1274acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // If the interface goes away if_nametoindex() will return 0 but we still need to know 1284acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // the index so we can remove the rules and routes. 1294acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran auto iter = interfaceToTable.find(interface); 1304acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (iter == interfaceToTable.end()) { 1314acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 1324acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return RT_TABLE_UNSPEC; 1334acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1344acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return iter->second; 1354acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1364acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1374acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid addTableName(uint32_t table, const std::string& name, std::string* contents) { 1384acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran char tableString[UINT32_STRLEN]; 1394acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran snprintf(tableString, sizeof(tableString), "%u", table); 1404acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += tableString; 1414acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += " "; 1424acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += name; 1434acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += "\n"; 1444acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1454acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1464acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// Doesn't return success/failure as the file is optional; it's okay if we fail to update it. 1474acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid updateTableNamesFile() { 1484acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran std::string contents; 149bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 150bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents); 151bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents); 152bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 15387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents); 1544acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); 1554acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); 156bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 1574acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran for (const auto& entry : interfaceToTable) { 1584acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(entry.second, entry.first, &contents); 1594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 161c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran int fd = open(RT_TABLES_PATH, RT_TABLES_FLAGS, RT_TABLES_MODE); 1624acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (fd == -1) { 1634acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("failed to create %s (%s)", RT_TABLES_PATH, strerror(errno)); 1644acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return; 165a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen } 1664acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // File creation is affected by umask, so make sure the right mode bits are set. 167c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran if (fchmod(fd, RT_TABLES_MODE) == -1) { 168c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran ALOGE("failed to set mode 0%o on %s (%s)", RT_TABLES_MODE, RT_TABLES_PATH, strerror(errno)); 1694acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1704acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ssize_t bytesWritten = write(fd, contents.data(), contents.size()); 1714acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (bytesWritten != static_cast<ssize_t>(contents.size())) { 1724acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("failed to write to %s (%zd vs %zu bytes) (%s)", RT_TABLES_PATH, bytesWritten, 1734acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran contents.size(), strerror(errno)); 1744acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1754acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran close(fd); 1765c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 1775c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1784753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Sends a netlink request and expects an ack. 1794753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// |iov| is an array of struct iovec that contains the netlink message payload. 1804753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// The netlink header is generated by this function based on |action| and |flags|. 1814753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Returns -errno if there was an error or if the kernel reported an error. 182f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) { 1834753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr nlmsg = { 1844753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_type = action, 1854753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_flags = flags, 1864753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 1874753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_base = &nlmsg; 1884753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_len = sizeof(nlmsg); 1894753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti for (int i = 0; i < iovlen; ++i) { 1904753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsg.nlmsg_len += iov[i].iov_len; 1914753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1924753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1934753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int ret; 1944753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti struct { 1954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr msg; 1964753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsgerr err; 1974753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } response; 1984753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1994753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE); 2004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1 && 201f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS), 202f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran sizeof(NETLINK_ADDRESS)) != -1 && 2034753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti writev(sock, iov, iovlen) != -1 && 2044753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti (ret = recv(sock, &response, sizeof(response), 0)) != -1) { 2054753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (ret == sizeof(response)) { 2064753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = response.err.error; // Netlink errors are negative errno. 207f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret) { 208f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink response contains error (%s)", strerror(-ret)); 209f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 2104753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 2111201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response)); 2124753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -EBADMSG; 2134753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2144753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 215f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno)); 2164753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -errno; 2174753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2184753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2194753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1) { 2204753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti close(sock); 2214753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2224753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2234753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return ret; 2244753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti} 2254753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 22687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 22787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { 22887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (!input) { 22987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = 0; 23087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = 0; 23187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 23287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 23387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = strlcpy(name, input, IFNAMSIZ) + 1; 23487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (*length > IFNAMSIZ) { 23587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); 23687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return -ENAMETOOLONG; 23787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 23887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); 23987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 24087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 24187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 2428fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 2438fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 2448fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the rule 2458fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// returns ENETUNREACH. 2468fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 2478fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 24887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |iif| is non-NULL, the rule matches the specified incoming interface. 24987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |oif| is non-NULL, the rule matches the specified outgoing interface. 25087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that 25187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// range (inclusive). Otherwise, the rule matches packets from all UIDs. 25296f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// 25396f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// Returns 0 on success or negative errno on failure. 254f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 25587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask, const char* iif, 25687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran const char* oif, uid_t uidStart, uid_t uidEnd) { 257f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 258f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (fwmark & ~mask) { 259f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 260f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ERANGE; 261f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 262f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 26387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran // Interface names must include exactly one terminating NULL and be properly padded, or older 2644753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // kernels will refuse to delete rules. 26587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; 26687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran size_t iifLength, oifLength; 26787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint16_t iifPadding, oifPadding; 26887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { 26987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 27087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 27187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { 27287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 2734753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2747619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2755965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti // Either both start and end UID must be specified, or neither. 276f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 277cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 2785965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti return -EUSERS; 2795965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti } 28072723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti bool isUidRule = (uidStart != INVALID_UID); 2815965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 2824753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rule request and put it in an array of iovec structures. 2834753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti fib_rule_hdr rule = { 2845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran .action = static_cast<uint8_t>(table != RT_TABLE_UNSPEC ? FR_ACT_TO_TBL : 2855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran FR_ACT_UNREACHABLE), 2864753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 287a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 28887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; 28987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; 290a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 2914753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iovec iov[] = { 292f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 293f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rule, sizeof(rule) }, 294f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 295f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &priority, sizeof(priority) }, 2965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 2975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 298f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 299f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &fwmark, mask ? sizeof(fwmark) : 0 }, 300f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 301f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &mask, mask ? sizeof(mask) : 0 }, 302f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 }, 303f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidStart, isUidRule ? sizeof(uidStart) : 0 }, 304f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 }, 305f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 }, 30687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, 30787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { iifName, iifLength }, 30887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, iifPadding }, 30987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, 31087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { oifName, oifLength }, 31187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, oifPadding }, 3124753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 3134753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 31472723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; 315f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 316f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rule.family = AF_FAMILIES[i]; 317f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) { 31896f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return ret; 3195c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3205c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3215c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 32296f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return 0; 3235c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 3245c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 32587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 32687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask) { 32787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, 32887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID); 32987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 33087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 331ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Adds or deletes an IPv4 or IPv6 route. 332ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Returns 0 on success or negative errno on failure. 333f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 334f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran const char* destination, const char* nexthop) { 335ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // At least the destination must be non-null. 336ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!destination) { 337f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("null destination"); 338ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EFAULT; 339ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 340ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 341ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // Parse the prefix. 342ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawAddress[sizeof(in6_addr)]; 343f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t family; 344f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t prefixLength; 345ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 346ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti &prefixLength); 347ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (rawLength < 0) { 348f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 349ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return rawLength; 350ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 3517619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 352ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 3531201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 354ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 355ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 356ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 357ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // If an interface was specified, find the ifindex. 358ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint32_t ifindex; 3595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (interface != OIF_NONE) { 360ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti ifindex = if_nametoindex(interface); 361ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!ifindex) { 362f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 363ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENODEV; 3647619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 3657619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 3667619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 367ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // If a nexthop was specified, parse it as the same family as the prefix. 368ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawNexthop[sizeof(in6_addr)]; 369f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 370f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("inet_pton failed for nexthop %s", nexthop); 371ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EINVAL; 372ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 373ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 3744753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rtmsg and put it in an array of iovec structures. 375f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtmsg route = { 376ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_protocol = RTPROT_STATIC, 377ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_type = RTN_UNICAST, 378ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_family = family, 379ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_dst_len = prefixLength, 380ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 3814753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 382f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 383f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 384ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 385ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti iovec iov[] = { 386f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 387f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &route, sizeof(route) }, 388f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 389f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &table, sizeof(table) }, 390f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaDst, sizeof(rtaDst) }, 391f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawAddress, static_cast<size_t>(rawLength) }, 3925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 3935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 394f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 395f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 396ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 397ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 398f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : 399f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran NETLINK_REQUEST_FLAGS; 4004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov)); 4017619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 4027619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 4035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// An iptables rule to mark incoming packets on a network with the netId of the network. 4045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is so that the kernel can: 4065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 4075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// replies, SYN-ACKs, etc). 4085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Mark sockets that accept connections from this interface so that the connection stays on the 4095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// same interface. 4105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 4115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 4155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = true; 4175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 419b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran char markString[UINT32_HEX_STRLEN]; 4205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue); 4215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 422b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j", 423b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran "MARK", "--set-mark", markString, NULL)) { 424b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran ALOGE("failed to change iptables rule that sets incoming packet mark"); 425b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return -EREMOTEIO; 426b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 4275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 428b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 429b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 430b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 431111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// A rule to route responses to the local network forwarded via the VPN. 432111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// 433111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// When a VPN is in effect, packets from the local network to upstream networks are forwarded into 434111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel. 435111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) { 436111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL, 437111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE, 438111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran INVALID_UID, INVALID_UID); 439111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran} 440111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran 441fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to route all traffic from a given set of UIDs to go over the VPN. 442fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 443fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 444fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 445fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// bypass the VPN if the protectedFromVpn bit is set. 446fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 44795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, bool add) { 448fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 449fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 450fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 451fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.protectedFromVpn = false; 452fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.protectedFromVpn = true; 453fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 45495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority; 45595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 45695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (secure) { 45795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_SECURE_VPN; 45895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } else { 45995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_BYPASSABLE_VPN; 46095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 46195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran fwmark.explicitlySelected = false; 46295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.explicitlySelected = true; 46395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } 46495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 46595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 46695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); 467fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 468fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 469fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 470fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// set of UIDs. 471fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 472fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 473fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// target set, but where the DnsProxyListener itself is not. 47495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure, 47595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool add) { 476fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 477fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 478fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 479fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.netId = netId; 480fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 481fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 482fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 483fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 484fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 48595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN; 48695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 48795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 48895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue); 489fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 490fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 4915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on an explicitly chosen network. 4925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 4945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 4965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// to check it again in the rules here, because a network's permissions may have been updated via 4975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// modifyNetworkPermission(). 4985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 4995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 501eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark fwmark; 502eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark mask; 503eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 504eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran fwmark.netId = netId; 505eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 506eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 5085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 509eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 5125c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 51487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); 5155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5165c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on a chosen outgoing interface. 5185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 5205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// the outgoing interface (typically for link-local communications). 5215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyOutputInterfaceRule(const char* interface, uint32_t table, 5225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 524122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 525122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 5265c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 527f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 528f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran mask.permission = permission; 5295c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 53187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd); 5325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on the chosen network. 5355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is for sockets that have not explicitly requested a particular network, but have been 5375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bound to one when they called connect(). This ensures that sockets connected on a particular 5385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// network stay on that network even if the default network changes. 5395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, 5405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 5415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 544122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 545122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 546122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 5475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 548122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 5495c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 552eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 55487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 5555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5565c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 55748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// A rule to enable split tunnel VPNs. 55848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// 55948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to 56048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// go over the default network, provided it wasn't explicitly restricted to the VPN and has the 56148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// permissions required by the default network. 56248e19b037e7e20674048ef76bf31ce65c741347cSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId, 56348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 56448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 56548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran uint32_t table = getRouteTableForInterface(physicalInterface); 56648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 56748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return -ESRCH; 56848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran } 56948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 57048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark fwmark; 57148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark mask; 57248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 57348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.netId = vpnNetId; 57448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 57548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 57648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.explicitlySelected = false; 57748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.explicitlySelected = true; 57848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 57948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.permission = permission; 58048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.permission = permission; 58148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 58248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue, 58348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.intValue); 58448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 58548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 586fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to allow legacy routes added through the requestRouteToHost() API. 587fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLegacyRouteRules() { 5885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 591fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 592fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 5935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 594fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // Rules to allow legacy routes to override the default network. 595fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 596fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue)) { 597fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 598fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 599fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 600fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { 601fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 602fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 603fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 604fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 605fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 606fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 607fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // A rule to allow legacy routes from system apps to override VPNs. 608fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 609fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue); 6105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 612fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to lookup the local network when specified explicitly or otherwise. 613fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) { 614fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 615fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran INVALID_UID, INVALID_UID, ACTION_ADD)) { 616fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 617fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 618fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 6195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 622fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 623fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 625fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, 62687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 6275c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 6285c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 629fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add a new rule to look up the 'main' table, with the same selectors as the "default network" 630fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// rule, but with a lower priority. Since the default network rule points to a table with a default 631fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// route, the rule we're adding will never be used for normal routing lookups. However, the kernel 632fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// may fall-through to it to find directly-connected routes when it validates that a nexthop (in a 633fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// route being added) is reachable. 634fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addDirectlyConnectedRule() { 635fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 636fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 6376a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 638fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.netId = NETID_UNSET; 639fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 640fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 641fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN, 642fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, UID_ROOT, UID_ROOT); 643fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 644fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 645fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add a rule to preempt the pre-defined "from all lookup main" rule. Packets that reach this rule 646fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// will be null-routed, and won't fall-through to the main table. 647fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addUnreachableRule() { 648fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET, 649fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran MARK_UNSET); 65087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 65187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 65287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { 6536a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 6546a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 6556a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 65687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyOutputInterfaceRule(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 65787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID, INVALID_UID, add); 6586a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 6596a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 6605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface, 6615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 6624043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 6635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 6644043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return -ESRCH; 6654043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 6664043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 6675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 6685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 6695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 6705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 6715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 6725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 6735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 6745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, permission, INVALID_UID, INVALID_UID, 6755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 6765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 6775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 6785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyImplicitNetworkRule(netId, table, permission, add); 6795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6804043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 6815009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface, 68295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran const UidRanges& uidRanges, bool secure, bool add, 6835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran bool modifyNonUidBasedRules) { 6845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 6855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 6865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 6875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 688b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 689e09b20aee85f1dfd8c18c3d8581ac875d939ba70Sreeram Ramachandran for (const UidRanges::Range& range : uidRanges.getRanges()) { 69095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, secure, add)) { 691fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 692fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 6935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first, 6945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 695b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 696b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 6975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, PERMISSION_NONE, range.first, 6985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 699b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 700b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 702eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 7035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (modifyNonUidBasedRules) { 7045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 705b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 706b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 707111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran if (int ret = modifyVpnOutputToLocalRule(interface, add)) { 708111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return ret; 709111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran } 71095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) { 711b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 712b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 713fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add); 714b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7154043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 716b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 7174043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 7184043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface, 7205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 7219c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 72396f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return -ESRCH; 7249c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 7259c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 726122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 727122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 728f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 7295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 730122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 731f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 732f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 733122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 7349c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 7355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 73687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran mask.intValue); 7377619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 7387619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 739fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyTetheredNetwork(uint16_t action, const char* inputInterface, 740fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran const char* outputInterface) { 741fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran uint32_t table = getRouteTableForInterface(outputInterface); 742fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 743fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return -ESRCH; 744fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 745fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 746fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, 747fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 748fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 749fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 750b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 751b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram RamachandranWARN_UNUSED_RESULT int flushRules() { 752b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 753b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran const char* argv[] = { 754b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_PATH, 755b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_VERSIONS[i], 756b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "rule", 757b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "flush", 758b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran }; 759b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { 760b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran ALOGE("failed to flush rules"); 761b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return -EREMOTEIO; 762b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 763b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 764b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return 0; 765b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran} 766b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran 767f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected 768f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// route, to the main table as well. 769f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// Returns 0 on success or negative errno on failure. 770eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram RamachandranWARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination, 771eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, RouteController::TableType tableType) { 7725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table; 77338b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran switch (tableType) { 77438b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran case RouteController::INTERFACE: { 77538b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran table = getRouteTableForInterface(interface); 7765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 7785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 77938b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 78038b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 78187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran case RouteController::LOCAL_NETWORK: { 78287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran table = ROUTE_TABLE_LOCAL_NETWORK; 78387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran break; 78487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 7855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_NETWORK: { 7864acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_NETWORK; 78738b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 78838b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 7895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_SYSTEM: { 7904acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_SYSTEM; 79138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 79238b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 79338b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 7949c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 795f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti int ret = modifyIpRoute(action, table, interface, destination, nexthop); 7961077d298655efa7755925e788d49a73e9db10afcSreeram Ramachandran // We allow apps to call requestRouteToHost() multiple times with the same route, so ignore 7971077d298655efa7755925e788d49a73e9db10afcSreeram Ramachandran // EEXIST failures when adding routes to legacy tables. 7985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST && 79987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran (tableType == RouteController::LEGACY_NETWORK || 80087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran tableType == RouteController::LEGACY_SYSTEM))) { 801f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 802c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 803c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 804c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran // If there's no nexthop, this is a directly connected route. Add it to the main table also, to 805f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti // let the kernel find it when validating nexthops when global routes are added. 806f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti if (!nexthop) { 807f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti ret = modifyIpRoute(action, RT_TABLE_MAIN, interface, destination, NULL); 808f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti // A failure with action == ADD && errno == EEXIST means that the route already exists in 809f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti // the main table, perhaps because the kernel added it automatically as part of adding the 810f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti // IP address to the interface. Ignore this, but complain about everything else. 811f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { 812f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 813f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti } 814c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 815c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 816f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return 0; 8179c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 8189c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 819f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 820f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int flushRoutes(const char* interface) { 82192b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 8225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 823f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ESRCH; 82492b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 82592b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 826357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti char tableString[UINT32_STRLEN]; 827357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti snprintf(tableString, sizeof(tableString), "%u", table); 828357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 829f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 830357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti const char* argv[] = { 831357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti IP_PATH, 832f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran IP_VERSIONS[i], 83372999d6cfc1df23cd911b85730f1f532fb62bed4Sreeram Ramachandran "route", 834357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "flush", 835357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "table", 836357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti tableString, 837357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti }; 838f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { 839f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("failed to flush routes"); 840f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -EREMOTEIO; 841357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 842357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 843357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 8444acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran interfaceToTable.erase(interface); 845f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 84692b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 84792b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 8485c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} // namespace 8495c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 85087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::Init(unsigned localNetId) { 851b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (int ret = flushRules()) { 852b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 853b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 85487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = addLegacyRouteRules()) { 855f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 856f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 857fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addLocalNetworkRules(localNetId)) { 858b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 859f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 860fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addDirectlyConnectedRule()) { 86187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 86287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 863fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addUnreachableRule()) { 86487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 86587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 8664acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 867f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 8688fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 8698fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 8706a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { 87187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_ADD); 8726a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 8736a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 8746a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { 87587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_DEL); 8766a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 8776a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 8785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 8795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 8804acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { 8814acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 8824acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 8834acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 8844acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 8855c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 8865c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 8875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 8885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 8895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 890f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 891f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 8924acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 8934acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 8944acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 8954acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 8964acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 897379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 898379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 8995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 90095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 90195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 9024acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 9034acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9044acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9054acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9064acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9074043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 9084043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 9095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 91095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 91195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 9125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 9134043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return ret; 9144043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 9154acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 9164acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9174acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9184acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9194acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9204043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 9214043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 9225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 9235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission oldPermission, 9245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission newPermission) { 925379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 9265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 927f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 928f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 9295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 930b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 931b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 93295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranint RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure, 9335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 93495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 9355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 936b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 937b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 9385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 93995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 94095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 9415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 9429c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 9439c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 9445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 9455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 9469c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 9479c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 9485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 9495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 9515c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 9527619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 953f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 954eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran TableType tableType) { 955eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 9567619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 9577619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 958f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colittiint RouteController::removeRoute(const char* interface, const char* destination, 959eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, TableType tableType) { 960eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 9617619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 96287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 96387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { 964fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface); 96587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 96687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 96787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { 968fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface); 96987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 97048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 97148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface, 97248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 97348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission); 97448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 97548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 97648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId, 97748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 97848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 97948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission); 98048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 981