RouteController.cpp revision bd37832f1843ed78f64604e5627cf952ac9614ba
15c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran/* 25c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Copyright (C) 2014 The Android Open Source Project 35c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 45c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Licensed under the Apache License, Version 2.0 (the "License"); 55c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * you may not use this file except in compliance with the License. 65c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * You may obtain a copy of the License at 75c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 85c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * http://www.apache.org/licenses/LICENSE-2.0 95c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 105c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Unless required by applicable law or agreed to in writing, software 115c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * distributed under the License is distributed on an "AS IS" BASIS, 125c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 135c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * See the License for the specific language governing permissions and 145c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * limitations under the License. 155c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran */ 165c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 175c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "RouteController.h" 185c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 19aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <arpa/inet.h> 20aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <errno.h> 21aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <fcntl.h> 22aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <linux/fib_rules.h> 23aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <net/if.h> 24aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <sys/stat.h> 25aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert 26bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes#include <private/android_filesystem_config.h> 27bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes 28aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <map> 29aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert 305c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "Fwmark.h" 31b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran#include "UidRanges.h" 32f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 33f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#define LOG_TAG "Netd" 34f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "log/log.h" 35f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "logwrap/logwrap.h" 36bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes#include "utils/file.h" 375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran#include "resolv_netid.h" 385c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 395c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandrannamespace { 405c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 41f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// BEGIN CONSTANTS -------------------------------------------------------------------------------- 42f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000; 44111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL = 11000; 455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_SECURE_VPN = 12000; 465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; 475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; 485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; 495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; 506a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranconst uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; 5187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t RULE_PRIORITY_TETHERING = 18000; 525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000; 5395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranconst uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000; 5448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000; 555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; 56a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitticonst uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000; 57db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitticonst uint32_t RULE_PRIORITY_UNREACHABLE = 32000; 585c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97; 604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98; 614acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99; 624acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 6387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network"; 644acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network"; 654acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system"; 664acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 67bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL = "local"; 68bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_MAIN = "main"; 69bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 705965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not 715965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make 725965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert 735965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// that will warn us if upstream has given these values some other meaning. 745965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_START = 18; 755965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_END = 19; 765965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colittistatic_assert(FRA_UID_START > FRA_MAX, 775965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. " 785965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Check that these values match what the kernel does and then update this assertion."); 795965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 8072723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK; 8172723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL; 824753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 83f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0}; 84f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 85f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; 86f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 87f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst char* const IP_VERSIONS[] = {"-4", "-6"}; 88f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uid_t UID_ROOT = 0; 9087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const IIF_NONE = NULL; 915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst char* const OIF_NONE = NULL; 925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_ADD = true; 935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_DEL = false; 945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool MODIFY_NON_UID_BASED_RULES = true; 955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 964acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 97c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r-- 984acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 9999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitticonst unsigned ROUTE_FLUSH_ATTEMPTS = 2; 10099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 101f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" 102f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). 103f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconstexpr uint16_t U16_RTA_LENGTH(uint16_t x) { 104f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return RTA_LENGTH(x); 105f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran} 106f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 107f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// These are practically const, but can't be declared so, because they are used to initialize 108f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// non-const pointers ("void* iov_base") in iovec arrays. 109f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; 110f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; 111f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; 112f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; 113f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START }; 114f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END }; 115f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 116f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; 117f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; 118f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 119f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranuint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; 120f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 121f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// END CONSTANTS ---------------------------------------------------------------------------------- 122f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 1234acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// No locks needed because RouteController is accessed only from one thread (in CommandListener). 1244acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranstd::map<std::string, uint32_t> interfaceToTable; 125a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen 1265c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranuint32_t getRouteTableForInterface(const char* interface) { 127a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran uint32_t index = if_nametoindex(interface); 128a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen if (index) { 1294acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; 1304acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran interfaceToTable[interface] = index; 1314acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return index; 1324acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1334acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // If the interface goes away if_nametoindex() will return 0 but we still need to know 1344acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // the index so we can remove the rules and routes. 1354acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran auto iter = interfaceToTable.find(interface); 1364acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (iter == interfaceToTable.end()) { 1374acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 1384acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return RT_TABLE_UNSPEC; 1394acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1404acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return iter->second; 1414acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1424acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1434acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid addTableName(uint32_t table, const std::string& name, std::string* contents) { 1444acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran char tableString[UINT32_STRLEN]; 1454acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran snprintf(tableString, sizeof(tableString), "%u", table); 1464acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += tableString; 1474acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += " "; 1484acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += name; 1494acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += "\n"; 1504acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1514acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1524acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// Doesn't return success/failure as the file is optional; it's okay if we fail to update it. 1534acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid updateTableNamesFile() { 1544acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran std::string contents; 155bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 156bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents); 157bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents); 158bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 15987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents); 1604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); 1614acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); 162bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 1634acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran for (const auto& entry : interfaceToTable) { 1644acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(entry.second, entry.first, &contents); 1654acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1664acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 167bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes if (!android::WriteStringToFile(contents, RT_TABLES_PATH, RT_TABLES_MODE, AID_SYSTEM, AID_WIFI)) { 168bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes ALOGE("failed to write to %s (%s)", RT_TABLES_PATH, strerror(errno)); 1694acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return; 170a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen } 1715c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 1725c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1734753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Sends a netlink request and expects an ack. 1744753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// |iov| is an array of struct iovec that contains the netlink message payload. 1754753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// The netlink header is generated by this function based on |action| and |flags|. 1764753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Returns -errno if there was an error or if the kernel reported an error. 177f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) { 1784753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr nlmsg = { 1794753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_type = action, 1804753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_flags = flags, 1814753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 1824753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_base = &nlmsg; 1834753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_len = sizeof(nlmsg); 1844753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti for (int i = 0; i < iovlen; ++i) { 1854753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsg.nlmsg_len += iov[i].iov_len; 1864753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1874753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1884753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int ret; 1894753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti struct { 1904753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr msg; 1914753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsgerr err; 1924753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } response; 1934753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 19453ea9cadf6cc5f8be1c16b5b6b660cd7366fd3f0Nick Kralevich int sock = socket(AF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_ROUTE); 1954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1 && 196f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS), 197f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran sizeof(NETLINK_ADDRESS)) != -1 && 1984753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti writev(sock, iov, iovlen) != -1 && 1994753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti (ret = recv(sock, &response, sizeof(response), 0)) != -1) { 2004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (ret == sizeof(response)) { 2014753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = response.err.error; // Netlink errors are negative errno. 202f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret) { 203f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink response contains error (%s)", strerror(-ret)); 204f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 2054753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 2061201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response)); 2074753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -EBADMSG; 2084753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2094753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 210f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno)); 2114753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -errno; 2124753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2134753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2144753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1) { 2154753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti close(sock); 2164753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2174753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2184753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return ret; 2194753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti} 2204753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 22187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 22287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { 22387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (!input) { 22487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = 0; 22587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = 0; 22687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 22787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 22887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = strlcpy(name, input, IFNAMSIZ) + 1; 22987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (*length > IFNAMSIZ) { 23087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); 23187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return -ENAMETOOLONG; 23287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 23387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); 23487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 23587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 23687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 2378fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 2388fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 2398fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the rule 2408fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// returns ENETUNREACH. 2418fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 2428fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 24387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |iif| is non-NULL, the rule matches the specified incoming interface. 24487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |oif| is non-NULL, the rule matches the specified outgoing interface. 24587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that 24687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// range (inclusive). Otherwise, the rule matches packets from all UIDs. 24796f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// 24896f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// Returns 0 on success or negative errno on failure. 249f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 25087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask, const char* iif, 25187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran const char* oif, uid_t uidStart, uid_t uidEnd) { 252f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 253f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (fwmark & ~mask) { 254f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 255f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ERANGE; 256f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 257f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 25887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran // Interface names must include exactly one terminating NULL and be properly padded, or older 2594753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // kernels will refuse to delete rules. 26087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; 26187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran size_t iifLength, oifLength; 26287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint16_t iifPadding, oifPadding; 26387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { 26487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 26587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 26687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { 26787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 2684753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2697619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2705965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti // Either both start and end UID must be specified, or neither. 271f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 272cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 2735965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti return -EUSERS; 2745965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti } 27572723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti bool isUidRule = (uidStart != INVALID_UID); 2765965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 2774753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rule request and put it in an array of iovec structures. 2784753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti fib_rule_hdr rule = { 2795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran .action = static_cast<uint8_t>(table != RT_TABLE_UNSPEC ? FR_ACT_TO_TBL : 2805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran FR_ACT_UNREACHABLE), 2814753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 282a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 28387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; 28487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; 285a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 2864753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iovec iov[] = { 287f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 288f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rule, sizeof(rule) }, 289f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 290f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &priority, sizeof(priority) }, 2915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 2925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 293f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 294f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &fwmark, mask ? sizeof(fwmark) : 0 }, 295f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 296f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &mask, mask ? sizeof(mask) : 0 }, 297f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 }, 298f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidStart, isUidRule ? sizeof(uidStart) : 0 }, 299f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 }, 300f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 }, 30187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, 30287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { iifName, iifLength }, 30387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, iifPadding }, 30487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, 30587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { oifName, oifLength }, 30687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, oifPadding }, 3074753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 3084753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 30972723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; 310f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 311f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rule.family = AF_FAMILIES[i]; 312f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) { 31396f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return ret; 3145c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3155c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3165c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 31796f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return 0; 3185c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 3195c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 32087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 32187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask) { 32287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, 32387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID); 32487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 32587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 326ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Adds or deletes an IPv4 or IPv6 route. 327ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Returns 0 on success or negative errno on failure. 328f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 329f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran const char* destination, const char* nexthop) { 330ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // At least the destination must be non-null. 331ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!destination) { 332f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("null destination"); 333ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EFAULT; 334ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 335ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 336ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // Parse the prefix. 337ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawAddress[sizeof(in6_addr)]; 338f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t family; 339f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t prefixLength; 340ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 341ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti &prefixLength); 342ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (rawLength < 0) { 343f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 344ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return rawLength; 345ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 3467619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 347ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 3481201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 349ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 350ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 351ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 352de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t type = RTN_UNICAST; 353ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint32_t ifindex; 354de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t rawNexthop[sizeof(in6_addr)]; 355de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran 356de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && !strcmp(nexthop, "unreachable")) { 357de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran type = RTN_UNREACHABLE; 358de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup 359de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for 360de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.) 361de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran interface = OIF_NONE; 362de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran nexthop = NULL; 3634c95a125e0930c112555437589f7620575482095Lorenzo Colitti } else if (nexthop && !strcmp(nexthop, "throw")) { 3644c95a125e0930c112555437589f7620575482095Lorenzo Colitti type = RTN_THROW; 3654c95a125e0930c112555437589f7620575482095Lorenzo Colitti interface = OIF_NONE; 3664c95a125e0930c112555437589f7620575482095Lorenzo Colitti nexthop = NULL; 367de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } else { 368de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If an interface was specified, find the ifindex. 369de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (interface != OIF_NONE) { 370de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ifindex = if_nametoindex(interface); 371de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (!ifindex) { 372de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 373de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -ENODEV; 374de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 3757619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 3767619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 377de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If a nexthop was specified, parse it as the same family as the prefix. 378de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 379de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("inet_pton failed for nexthop %s", nexthop); 380de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -EINVAL; 381de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 382ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 383ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 3844753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rtmsg and put it in an array of iovec structures. 385f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtmsg route = { 386ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_protocol = RTPROT_STATIC, 387de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran .rtm_type = type, 388ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_family = family, 389ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_dst_len = prefixLength, 3902bff72e0cf091f4d71af0c81cfc74e8ebd8c6644Sreeram Ramachandran .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK), 391ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 3924753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 393f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 394f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 395ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 396ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti iovec iov[] = { 397f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 398f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &route, sizeof(route) }, 399f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 400f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &table, sizeof(table) }, 401f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaDst, sizeof(rtaDst) }, 402f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawAddress, static_cast<size_t>(rawLength) }, 4035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 4045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 405f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 406f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 407ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 408ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 409f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : 410f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran NETLINK_REQUEST_FLAGS; 4114753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov)); 4127619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 4137619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 4145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// An iptables rule to mark incoming packets on a network with the netId of the network. 4155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is so that the kernel can: 4175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 4185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// replies, SYN-ACKs, etc). 4195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Mark sockets that accept connections from this interface so that the connection stays on the 4205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// same interface. 4215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 4225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 4265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = true; 4285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 430b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran char markString[UINT32_HEX_STRLEN]; 4315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue); 4325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 433b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j", 434b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran "MARK", "--set-mark", markString, NULL)) { 435b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran ALOGE("failed to change iptables rule that sets incoming packet mark"); 436b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return -EREMOTEIO; 437b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 4385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 439b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 440b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 441b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 442111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// A rule to route responses to the local network forwarded via the VPN. 443111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// 444111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// When a VPN is in effect, packets from the local network to upstream networks are forwarded into 445111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel. 446111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) { 447111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL, 448111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE, 449111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran INVALID_UID, INVALID_UID); 450111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran} 451111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran 452fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to route all traffic from a given set of UIDs to go over the VPN. 453fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 454fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 455fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 456fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// bypass the VPN if the protectedFromVpn bit is set. 457fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 45895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, bool add) { 459fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 460fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 461fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 462fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.protectedFromVpn = false; 463fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.protectedFromVpn = true; 464fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 46595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority; 46695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 46795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (secure) { 46895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_SECURE_VPN; 46995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } else { 47095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_BYPASSABLE_VPN; 47195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 47295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran fwmark.explicitlySelected = false; 47395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.explicitlySelected = true; 47495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } 47595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 47695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 47795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); 478fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 479fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 480fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 481fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// set of UIDs. 482fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 483fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 484fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// target set, but where the DnsProxyListener itself is not. 48595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure, 48695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool add) { 487fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 488fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 489fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 490fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.netId = netId; 491fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 492fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 493fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 494fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 495fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 49695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN; 49795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 49895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 49995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue); 500fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 501fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 5025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on an explicitly chosen network. 5035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 5055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 5075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// to check it again in the rules here, because a network's permissions may have been updated via 5085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// modifyNetworkPermission(). 5095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 5105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 512eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark fwmark; 513eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark mask; 514eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 515eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran fwmark.netId = netId; 516eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 517eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 5195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 520eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 5235c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 52587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); 5265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5275c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on a chosen outgoing interface. 5295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 5315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// the outgoing interface (typically for link-local communications). 5325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyOutputInterfaceRule(const char* interface, uint32_t table, 5335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 535122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 536122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 5375c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 538f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 539f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran mask.permission = permission; 5405c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 54287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd); 5435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on the chosen network. 5465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is for sockets that have not explicitly requested a particular network, but have been 5485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bound to one when they called connect(). This ensures that sockets connected on a particular 5495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// network stay on that network even if the default network changes. 5505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, 5515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 5525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 555122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 556122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 557122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 5585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 559122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 5605c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 563eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 56587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 5665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5675c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 56848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// A rule to enable split tunnel VPNs. 56948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// 57048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to 57148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// go over the default network, provided it wasn't explicitly restricted to the VPN and has the 57248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// permissions required by the default network. 57348e19b037e7e20674048ef76bf31ce65c741347cSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId, 57448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 57548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 57648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran uint32_t table = getRouteTableForInterface(physicalInterface); 57748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 57848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return -ESRCH; 57948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran } 58048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 58148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark fwmark; 58248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark mask; 58348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 58448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.netId = vpnNetId; 58548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 58648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 58748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.explicitlySelected = false; 58848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.explicitlySelected = true; 58948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 59048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.permission = permission; 59148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.permission = permission; 59248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 59348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue, 59448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.intValue); 59548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 59648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 597fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to allow legacy routes added through the requestRouteToHost() API. 598fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLegacyRouteRules() { 5995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 602fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 603fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 605fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // Rules to allow legacy routes to override the default network. 606fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 607fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue)) { 608fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 609fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 610fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 611fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { 612fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 613fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 614fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 615fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 616fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 617fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 618fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // A rule to allow legacy routes from system apps to override VPNs. 619fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 620fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue); 6215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 623fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to lookup the local network when specified explicitly or otherwise. 624fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) { 625fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 626fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran INVALID_UID, INVALID_UID, ACTION_ADD)) { 627fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 628fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 629fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 6305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 633fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 634fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 636fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, 63787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 6385c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 6395c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 640a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti// Add a new rule to look up the 'main' table, with the same selectors as the "default network" 641db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule, but with a lower priority. We will never create routes in the main table; it should only be 642db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// used for directly-connected routes implicitly created by the kernel when adding IP addresses. 643db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// This is necessary, for example, when adding a route through a directly-connected gateway: in 644db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// order to add the route, there must already be a directly-connected route that covers the gateway. 645a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo ColittiWARN_UNUSED_RESULT int addDirectlyConnectedRule() { 646a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark fwmark; 647a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark mask; 648a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 649a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.netId = NETID_UNSET; 650a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti mask.netId = FWMARK_NET_ID_MASK; 651a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 652a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN, 653a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, UID_ROOT, UID_ROOT); 654a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti} 655a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 656db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that 657db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended 658db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable 659db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule will hopefully make things even clearer. 660fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addUnreachableRule() { 661fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET, 662fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran MARK_UNSET); 66387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 66487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 66587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { 6666a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 6676a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 6686a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 66987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyOutputInterfaceRule(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 67087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID, INVALID_UID, add); 6716a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 6726a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 6735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface, 6745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 6754043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 6765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 6774043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return -ESRCH; 6784043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 6794043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 6805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 6815009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 6825009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 6835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 6845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 6855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 6865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 6875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, permission, INVALID_UID, INVALID_UID, 6885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 6895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 6905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 6915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyImplicitNetworkRule(netId, table, permission, add); 6925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6934043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 6945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface, 69595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran const UidRanges& uidRanges, bool secure, bool add, 6965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran bool modifyNonUidBasedRules) { 6975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 6985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 6995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 7005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 701b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 702e09b20aee85f1dfd8c18c3d8581ac875d939ba70Sreeram Ramachandran for (const UidRanges::Range& range : uidRanges.getRanges()) { 70395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, secure, add)) { 704fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 705fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 7065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first, 7075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 708b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 709b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, PERMISSION_NONE, range.first, 7115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 712b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 713b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 715eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 7165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (modifyNonUidBasedRules) { 7175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 718b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 719b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 720111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran if (int ret = modifyVpnOutputToLocalRule(interface, add)) { 721111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return ret; 722111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran } 72395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) { 724b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 725b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 726fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add); 727b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7284043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 729b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 7304043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 7314043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface, 7335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 7349c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 73696f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return -ESRCH; 7379c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 7389c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 739122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 740122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 741f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 7425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 743122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 744f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 745f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 746122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 7479c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 7485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 74987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran mask.intValue); 7507619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 7517619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 752fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyTetheredNetwork(uint16_t action, const char* inputInterface, 753fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran const char* outputInterface) { 754fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran uint32_t table = getRouteTableForInterface(outputInterface); 755fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 756fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return -ESRCH; 757fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 758fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 759fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, 760fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 761fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 762fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 763b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 764b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram RamachandranWARN_UNUSED_RESULT int flushRules() { 765b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 766b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran const char* argv[] = { 767b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_PATH, 768b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_VERSIONS[i], 769b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "rule", 770b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "flush", 771b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran }; 772b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { 773b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran ALOGE("failed to flush rules"); 774b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return -EREMOTEIO; 775b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 776b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 777b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return 0; 778b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran} 779b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran 780f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected 781f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// route, to the main table as well. 782f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// Returns 0 on success or negative errno on failure. 783eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram RamachandranWARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination, 784eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, RouteController::TableType tableType) { 7855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table; 78638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran switch (tableType) { 78738b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran case RouteController::INTERFACE: { 78838b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran table = getRouteTableForInterface(interface); 7895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 7915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 79238b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 79338b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 79487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran case RouteController::LOCAL_NETWORK: { 79587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran table = ROUTE_TABLE_LOCAL_NETWORK; 79687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran break; 79787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 7985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_NETWORK: { 7994acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_NETWORK; 80038b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 80138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_SYSTEM: { 8034acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_SYSTEM; 80438b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 80538b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 80638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8079c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 808f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti int ret = modifyIpRoute(action, table, interface, destination, nexthop); 8090321315d4e94dacd5ef2e0de217059cbc72d803dSreeram Ramachandran // Trying to add a route that already exists shouldn't cause an error. 8100321315d4e94dacd5ef2e0de217059cbc72d803dSreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { 811f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 812c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 813c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 814f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return 0; 8159c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 8169c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 817f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 818f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int flushRoutes(const char* interface) { 81992b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 8205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 821f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ESRCH; 82292b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 82392b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 824357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti char tableString[UINT32_STRLEN]; 825357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti snprintf(tableString, sizeof(tableString), "%u", table); 826357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 82799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int ret = 0; 828f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 829357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti const char* argv[] = { 830357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti IP_PATH, 831f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran IP_VERSIONS[i], 83272999d6cfc1df23cd911b85730f1f532fb62bed4Sreeram Ramachandran "route", 833357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "flush", 834357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "table", 835357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti tableString, 836357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti }; 83799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 83899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // A flush works by dumping routes and deleting each route as it's returned, and it can 83999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // fail if something else deletes the route between the dump and the delete. This can 84099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // happen, for example, if an interface goes down while we're trying to flush its routes. 84199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // So try multiple times and only return an error if the last attempt fails. 84299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // 84399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // TODO: replace this with our own netlink code. 84499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti unsigned attempts = 0; 84599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int err; 84699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti do { 84799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti err = android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), 84899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti NULL, false, false); 84999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ++attempts; 85099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } while (err != 0 && attempts < ROUTE_FLUSH_ATTEMPTS); 85199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (err) { 85299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ALOGE("failed to flush %s routes in table %s after %d attempts", 85399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti IP_VERSIONS[i], tableString, attempts); 85499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ret = -EREMOTEIO; 855357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 856357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 857357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 85899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // If we failed to flush routes, the caller may elect to keep this interface around, so keep 85999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // track of its name. 86099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (!ret) { 86199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti interfaceToTable.erase(interface); 86299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } 86399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 86499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti return ret; 86592b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 86692b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 8675c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} // namespace 8685c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 86987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::Init(unsigned localNetId) { 870b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (int ret = flushRules()) { 871b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 872b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 87387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = addLegacyRouteRules()) { 874f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 875f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 876fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addLocalNetworkRules(localNetId)) { 877b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 878f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 879a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti if (int ret = addDirectlyConnectedRule()) { 880a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return ret; 881a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti } 882fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addUnreachableRule()) { 88387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 88487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 8854acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 886f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 8878fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 8888fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 8896a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { 89087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_ADD); 8916a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 8926a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 8936a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { 89487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_DEL); 8956a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 8966a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 8975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 8985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 8994acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { 9004acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9014acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9024acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9034acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9045c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 9055c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 9065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 9075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 909f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 910f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 9114acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 9124acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9134acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9144acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9154acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 916379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 917379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 9185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 91995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 92095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 9214acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 9224acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9234acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9244acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9254acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9264043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 9274043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 9285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 92995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 93095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 9315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 9324043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return ret; 9334043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 9344acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 9354acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9364acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9374acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9384acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9394043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 9404043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 9415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 9425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission oldPermission, 9435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission newPermission) { 944379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 9455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 946f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 947f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 9485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 949b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 950b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 95195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranint RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure, 9525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 95395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 9545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 955b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 956b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 9575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 95895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 95995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 9605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 9619c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 9629c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 9635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 9645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 9659c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 9669c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 9675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 9685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 9705c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 9717619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 972f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 973eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran TableType tableType) { 974eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 9757619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 9767619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 977f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colittiint RouteController::removeRoute(const char* interface, const char* destination, 978eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, TableType tableType) { 979eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 9807619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 98187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 98287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { 983fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface); 98487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 98587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 98687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { 987fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface); 98887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 98948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 99048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface, 99148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 99248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission); 99348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 99448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 99548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId, 99648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 99748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 99848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission); 99948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 1000