RouteController.cpp revision 99286fe1ef6fc325c28dd10b651b5adedd549495
15c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran/* 25c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Copyright (C) 2014 The Android Open Source Project 35c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 45c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Licensed under the Apache License, Version 2.0 (the "License"); 55c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * you may not use this file except in compliance with the License. 65c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * You may obtain a copy of the License at 75c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 85c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * http://www.apache.org/licenses/LICENSE-2.0 95c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 105c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Unless required by applicable law or agreed to in writing, software 115c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * distributed under the License is distributed on an "AS IS" BASIS, 125c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 135c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * See the License for the specific language governing permissions and 145c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * limitations under the License. 155c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran */ 165c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 175c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "RouteController.h" 185c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 195c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "Fwmark.h" 20b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran#include "UidRanges.h" 21f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 22f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#define LOG_TAG "Netd" 23f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "log/log.h" 24f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "logwrap/logwrap.h" 255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran#include "resolv_netid.h" 265c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 27ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti#include <arpa/inet.h> 284acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran#include <fcntl.h> 294753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti#include <linux/fib_rules.h> 30a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen#include <map> 315c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include <net/if.h> 324acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran#include <sys/stat.h> 335c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 345c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandrannamespace { 355c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 36f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// BEGIN CONSTANTS -------------------------------------------------------------------------------- 37f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000; 39111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL = 11000; 405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_SECURE_VPN = 12000; 415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; 425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; 435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; 445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; 456a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranconst uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; 4687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t RULE_PRIORITY_TETHERING = 18000; 475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000; 4895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranconst uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000; 4948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000; 505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; 51a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitticonst uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000; 52db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitticonst uint32_t RULE_PRIORITY_UNREACHABLE = 32000; 535c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97; 554acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98; 564acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99; 574acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 5887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network"; 594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network"; 604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system"; 614acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 62bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL = "local"; 63bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_MAIN = "main"; 64bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 655965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not 665965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make 675965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert 685965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// that will warn us if upstream has given these values some other meaning. 695965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_START = 18; 705965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_END = 19; 715965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colittistatic_assert(FRA_UID_START > FRA_MAX, 725965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. " 735965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Check that these values match what the kernel does and then update this assertion."); 745965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 7572723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK; 7672723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL; 774753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 78f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0}; 79f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 80f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; 81f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 82f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst char* const IP_VERSIONS[] = {"-4", "-6"}; 83f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uid_t UID_ROOT = 0; 8587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const IIF_NONE = NULL; 865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst char* const OIF_NONE = NULL; 875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_ADD = true; 885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_DEL = false; 895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool MODIFY_NON_UID_BASED_RULES = true; 905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 914acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 92c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst int RT_TABLES_FLAGS = O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW | O_CLOEXEC; 93c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r-- 944acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 9599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitticonst unsigned ROUTE_FLUSH_ATTEMPTS = 2; 9699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 97f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" 98f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). 99f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconstexpr uint16_t U16_RTA_LENGTH(uint16_t x) { 100f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return RTA_LENGTH(x); 101f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran} 102f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 103f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// These are practically const, but can't be declared so, because they are used to initialize 104f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// non-const pointers ("void* iov_base") in iovec arrays. 105f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; 106f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; 107f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; 108f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; 109f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START }; 110f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END }; 111f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 112f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; 113f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; 114f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 115f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranuint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; 116f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 117f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// END CONSTANTS ---------------------------------------------------------------------------------- 118f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 1194acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// No locks needed because RouteController is accessed only from one thread (in CommandListener). 1204acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranstd::map<std::string, uint32_t> interfaceToTable; 121a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen 1225c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranuint32_t getRouteTableForInterface(const char* interface) { 123a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran uint32_t index = if_nametoindex(interface); 124a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen if (index) { 1254acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; 1264acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran interfaceToTable[interface] = index; 1274acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return index; 1284acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1294acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // If the interface goes away if_nametoindex() will return 0 but we still need to know 1304acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // the index so we can remove the rules and routes. 1314acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran auto iter = interfaceToTable.find(interface); 1324acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (iter == interfaceToTable.end()) { 1334acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 1344acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return RT_TABLE_UNSPEC; 1354acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1364acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return iter->second; 1374acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1384acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1394acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid addTableName(uint32_t table, const std::string& name, std::string* contents) { 1404acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran char tableString[UINT32_STRLEN]; 1414acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran snprintf(tableString, sizeof(tableString), "%u", table); 1424acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += tableString; 1434acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += " "; 1444acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += name; 1454acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += "\n"; 1464acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1474acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1484acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// Doesn't return success/failure as the file is optional; it's okay if we fail to update it. 1494acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid updateTableNamesFile() { 1504acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran std::string contents; 151bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 152bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents); 153bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents); 154bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 15587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents); 1564acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); 1574acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); 158bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 1594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran for (const auto& entry : interfaceToTable) { 1604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(entry.second, entry.first, &contents); 1614acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1624acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 163c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran int fd = open(RT_TABLES_PATH, RT_TABLES_FLAGS, RT_TABLES_MODE); 1644acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (fd == -1) { 1654acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("failed to create %s (%s)", RT_TABLES_PATH, strerror(errno)); 1664acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return; 167a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen } 1684acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // File creation is affected by umask, so make sure the right mode bits are set. 169c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran if (fchmod(fd, RT_TABLES_MODE) == -1) { 170c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran ALOGE("failed to set mode 0%o on %s (%s)", RT_TABLES_MODE, RT_TABLES_PATH, strerror(errno)); 1714acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1724acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ssize_t bytesWritten = write(fd, contents.data(), contents.size()); 1734acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (bytesWritten != static_cast<ssize_t>(contents.size())) { 1744acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("failed to write to %s (%zd vs %zu bytes) (%s)", RT_TABLES_PATH, bytesWritten, 1754acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran contents.size(), strerror(errno)); 1764acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1774acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran close(fd); 1785c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 1795c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1804753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Sends a netlink request and expects an ack. 1814753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// |iov| is an array of struct iovec that contains the netlink message payload. 1824753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// The netlink header is generated by this function based on |action| and |flags|. 1834753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Returns -errno if there was an error or if the kernel reported an error. 184f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) { 1854753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr nlmsg = { 1864753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_type = action, 1874753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_flags = flags, 1884753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 1894753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_base = &nlmsg; 1904753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_len = sizeof(nlmsg); 1914753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti for (int i = 0; i < iovlen; ++i) { 1924753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsg.nlmsg_len += iov[i].iov_len; 1934753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1944753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int ret; 1964753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti struct { 1974753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr msg; 1984753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsgerr err; 1994753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } response; 2004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2014753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE); 2024753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1 && 203f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS), 204f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran sizeof(NETLINK_ADDRESS)) != -1 && 2054753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti writev(sock, iov, iovlen) != -1 && 2064753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti (ret = recv(sock, &response, sizeof(response), 0)) != -1) { 2074753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (ret == sizeof(response)) { 2084753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = response.err.error; // Netlink errors are negative errno. 209f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret) { 210f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink response contains error (%s)", strerror(-ret)); 211f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 2124753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 2131201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response)); 2144753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -EBADMSG; 2154753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2164753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 217f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno)); 2184753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -errno; 2194753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2204753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2214753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1) { 2224753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti close(sock); 2234753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2244753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2254753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return ret; 2264753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti} 2274753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 22887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 22987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { 23087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (!input) { 23187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = 0; 23287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = 0; 23387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 23487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 23587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = strlcpy(name, input, IFNAMSIZ) + 1; 23687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (*length > IFNAMSIZ) { 23787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); 23887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return -ENAMETOOLONG; 23987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 24087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); 24187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 24287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 24387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 2448fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 2458fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 2468fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the rule 2478fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// returns ENETUNREACH. 2488fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 2498fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 25087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |iif| is non-NULL, the rule matches the specified incoming interface. 25187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |oif| is non-NULL, the rule matches the specified outgoing interface. 25287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that 25387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// range (inclusive). Otherwise, the rule matches packets from all UIDs. 25496f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// 25596f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// Returns 0 on success or negative errno on failure. 256f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 25787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask, const char* iif, 25887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran const char* oif, uid_t uidStart, uid_t uidEnd) { 259f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 260f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (fwmark & ~mask) { 261f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 262f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ERANGE; 263f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 264f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 26587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran // Interface names must include exactly one terminating NULL and be properly padded, or older 2664753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // kernels will refuse to delete rules. 26787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; 26887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran size_t iifLength, oifLength; 26987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint16_t iifPadding, oifPadding; 27087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { 27187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 27287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 27387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { 27487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 2754753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2767619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2775965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti // Either both start and end UID must be specified, or neither. 278f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 279cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 2805965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti return -EUSERS; 2815965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti } 28272723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti bool isUidRule = (uidStart != INVALID_UID); 2835965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 2844753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rule request and put it in an array of iovec structures. 2854753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti fib_rule_hdr rule = { 2865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran .action = static_cast<uint8_t>(table != RT_TABLE_UNSPEC ? FR_ACT_TO_TBL : 2875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran FR_ACT_UNREACHABLE), 2884753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 289a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 29087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; 29187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; 292a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 2934753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iovec iov[] = { 294f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 295f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rule, sizeof(rule) }, 296f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 297f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &priority, sizeof(priority) }, 2985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 2995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 300f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 301f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &fwmark, mask ? sizeof(fwmark) : 0 }, 302f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 303f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &mask, mask ? sizeof(mask) : 0 }, 304f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 }, 305f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidStart, isUidRule ? sizeof(uidStart) : 0 }, 306f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 }, 307f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 }, 30887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, 30987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { iifName, iifLength }, 31087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, iifPadding }, 31187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, 31287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { oifName, oifLength }, 31387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, oifPadding }, 3144753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 3154753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 31672723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; 317f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 318f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rule.family = AF_FAMILIES[i]; 319f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) { 32096f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return ret; 3215c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3225c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3235c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 32496f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return 0; 3255c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 3265c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 32787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 32887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask) { 32987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, 33087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID); 33187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 33287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 333ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Adds or deletes an IPv4 or IPv6 route. 334ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Returns 0 on success or negative errno on failure. 335f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 336f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran const char* destination, const char* nexthop) { 337ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // At least the destination must be non-null. 338ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!destination) { 339f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("null destination"); 340ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EFAULT; 341ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 342ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 343ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // Parse the prefix. 344ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawAddress[sizeof(in6_addr)]; 345f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t family; 346f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t prefixLength; 347ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 348ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti &prefixLength); 349ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (rawLength < 0) { 350f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 351ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return rawLength; 352ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 3537619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 354ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 3551201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 356ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 357ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 358ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 359de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t type = RTN_UNICAST; 360ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint32_t ifindex; 361de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t rawNexthop[sizeof(in6_addr)]; 362de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran 363de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && !strcmp(nexthop, "unreachable")) { 364de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran type = RTN_UNREACHABLE; 365de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup 366de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for 367de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.) 368de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran interface = OIF_NONE; 369de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran nexthop = NULL; 370de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } else { 371de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If an interface was specified, find the ifindex. 372de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (interface != OIF_NONE) { 373de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ifindex = if_nametoindex(interface); 374de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (!ifindex) { 375de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 376de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -ENODEV; 377de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 3787619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 3797619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 380de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If a nexthop was specified, parse it as the same family as the prefix. 381de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 382de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("inet_pton failed for nexthop %s", nexthop); 383de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -EINVAL; 384de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 385ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 386ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 3874753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rtmsg and put it in an array of iovec structures. 388f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtmsg route = { 389ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_protocol = RTPROT_STATIC, 390de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran .rtm_type = type, 391ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_family = family, 392ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_dst_len = prefixLength, 3932bff72e0cf091f4d71af0c81cfc74e8ebd8c6644Sreeram Ramachandran .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK), 394ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 3954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 396f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 397f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 398ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 399ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti iovec iov[] = { 400f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 401f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &route, sizeof(route) }, 402f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 403f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &table, sizeof(table) }, 404f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaDst, sizeof(rtaDst) }, 405f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawAddress, static_cast<size_t>(rawLength) }, 4065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 4075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 408f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 409f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 410ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 411ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 412f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : 413f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran NETLINK_REQUEST_FLAGS; 4144753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov)); 4157619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 4167619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 4175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// An iptables rule to mark incoming packets on a network with the netId of the network. 4185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is so that the kernel can: 4205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 4215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// replies, SYN-ACKs, etc). 4225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Mark sockets that accept connections from this interface so that the connection stays on the 4235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// same interface. 4245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 4255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 4295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = true; 4315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 433b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran char markString[UINT32_HEX_STRLEN]; 4345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue); 4355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 436b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j", 437b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran "MARK", "--set-mark", markString, NULL)) { 438b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran ALOGE("failed to change iptables rule that sets incoming packet mark"); 439b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return -EREMOTEIO; 440b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 4415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 442b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 443b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 444b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 445111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// A rule to route responses to the local network forwarded via the VPN. 446111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// 447111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// When a VPN is in effect, packets from the local network to upstream networks are forwarded into 448111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel. 449111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) { 450111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL, 451111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE, 452111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran INVALID_UID, INVALID_UID); 453111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran} 454111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran 455fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to route all traffic from a given set of UIDs to go over the VPN. 456fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 457fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 458fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 459fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// bypass the VPN if the protectedFromVpn bit is set. 460fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 46195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, bool add) { 462fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 463fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 464fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 465fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.protectedFromVpn = false; 466fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.protectedFromVpn = true; 467fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 46895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority; 46995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 47095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (secure) { 47195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_SECURE_VPN; 47295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } else { 47395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_BYPASSABLE_VPN; 47495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 47595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran fwmark.explicitlySelected = false; 47695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.explicitlySelected = true; 47795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } 47895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 47995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 48095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); 481fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 482fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 483fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 484fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// set of UIDs. 485fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 486fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 487fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// target set, but where the DnsProxyListener itself is not. 48895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure, 48995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool add) { 490fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 491fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 492fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 493fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.netId = netId; 494fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 495fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 496fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 497fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 498fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 49995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN; 50095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 50195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 50295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue); 503fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 504fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 5055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on an explicitly chosen network. 5065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 5085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 5105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// to check it again in the rules here, because a network's permissions may have been updated via 5115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// modifyNetworkPermission(). 5125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 5135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 515eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark fwmark; 516eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark mask; 517eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 518eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran fwmark.netId = netId; 519eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 520eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 5225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 523eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 5265c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 52887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); 5295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5305c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on a chosen outgoing interface. 5325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 5345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// the outgoing interface (typically for link-local communications). 5355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyOutputInterfaceRule(const char* interface, uint32_t table, 5365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 538122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 539122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 5405c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 541f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 542f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran mask.permission = permission; 5435c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 54587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd); 5465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on the chosen network. 5495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is for sockets that have not explicitly requested a particular network, but have been 5515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bound to one when they called connect(). This ensures that sockets connected on a particular 5525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// network stay on that network even if the default network changes. 5535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, 5545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 5555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 558122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 559122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 560122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 5615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 562122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 5635c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 566eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 56887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 5695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5705c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 57148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// A rule to enable split tunnel VPNs. 57248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// 57348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to 57448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// go over the default network, provided it wasn't explicitly restricted to the VPN and has the 57548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// permissions required by the default network. 57648e19b037e7e20674048ef76bf31ce65c741347cSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId, 57748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 57848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 57948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran uint32_t table = getRouteTableForInterface(physicalInterface); 58048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 58148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return -ESRCH; 58248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran } 58348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 58448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark fwmark; 58548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark mask; 58648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 58748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.netId = vpnNetId; 58848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 58948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 59048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.explicitlySelected = false; 59148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.explicitlySelected = true; 59248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 59348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.permission = permission; 59448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.permission = permission; 59548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 59648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue, 59748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.intValue); 59848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 59948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 600fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to allow legacy routes added through the requestRouteToHost() API. 601fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLegacyRouteRules() { 6025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 605fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 606fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 608fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // Rules to allow legacy routes to override the default network. 609fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 610fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue)) { 611fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 612fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 613fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 614fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { 615fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 616fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 617fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 618fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 619fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 620fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 621fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // A rule to allow legacy routes from system apps to override VPNs. 622fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 623fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue); 6245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 626fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to lookup the local network when specified explicitly or otherwise. 627fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) { 628fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 629fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran INVALID_UID, INVALID_UID, ACTION_ADD)) { 630fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 631fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 632fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 6335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 636fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 637fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 639fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, 64087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 6415c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 6425c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 643a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti// Add a new rule to look up the 'main' table, with the same selectors as the "default network" 644db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule, but with a lower priority. We will never create routes in the main table; it should only be 645db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// used for directly-connected routes implicitly created by the kernel when adding IP addresses. 646db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// This is necessary, for example, when adding a route through a directly-connected gateway: in 647db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// order to add the route, there must already be a directly-connected route that covers the gateway. 648a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo ColittiWARN_UNUSED_RESULT int addDirectlyConnectedRule() { 649a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark fwmark; 650a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark mask; 651a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 652a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.netId = NETID_UNSET; 653a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti mask.netId = FWMARK_NET_ID_MASK; 654a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 655a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN, 656a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, UID_ROOT, UID_ROOT); 657a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti} 658a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 659db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that 660db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended 661db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable 662db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule will hopefully make things even clearer. 663fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addUnreachableRule() { 664fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET, 665fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran MARK_UNSET); 66687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 66787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 66887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { 6696a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 6706a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 6716a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 67287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyOutputInterfaceRule(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 67387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID, INVALID_UID, add); 6746a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 6756a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 6765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface, 6775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 6784043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 6795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 6804043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return -ESRCH; 6814043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 6824043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 6835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 6845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 6855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 6865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 6875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 6885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 6895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 6905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, permission, INVALID_UID, INVALID_UID, 6915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 6925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 6935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 6945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyImplicitNetworkRule(netId, table, permission, add); 6955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6964043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 6975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface, 69895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran const UidRanges& uidRanges, bool secure, bool add, 6995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran bool modifyNonUidBasedRules) { 7005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 7035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 704b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 705e09b20aee85f1dfd8c18c3d8581ac875d939ba70Sreeram Ramachandran for (const UidRanges::Range& range : uidRanges.getRanges()) { 70695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, secure, add)) { 707fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 708fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 7095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first, 7105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 711b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 712b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, PERMISSION_NONE, range.first, 7145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 715b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 716b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 718eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 7195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (modifyNonUidBasedRules) { 7205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 721b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 722b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 723111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran if (int ret = modifyVpnOutputToLocalRule(interface, add)) { 724111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return ret; 725111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran } 72695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) { 727b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 728b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 729fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add); 730b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7314043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 732b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 7334043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 7344043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface, 7365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 7379c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 73996f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return -ESRCH; 7409c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 7419c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 742122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 743122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 744f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 7455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 746122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 747f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 748f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 749122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 7509c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 7515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 75287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran mask.intValue); 7537619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 7547619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 755fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyTetheredNetwork(uint16_t action, const char* inputInterface, 756fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran const char* outputInterface) { 757fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran uint32_t table = getRouteTableForInterface(outputInterface); 758fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 759fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return -ESRCH; 760fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 761fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 762fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, 763fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 764fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 765fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 766b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 767b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram RamachandranWARN_UNUSED_RESULT int flushRules() { 768b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 769b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran const char* argv[] = { 770b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_PATH, 771b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_VERSIONS[i], 772b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "rule", 773b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "flush", 774b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran }; 775b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { 776b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran ALOGE("failed to flush rules"); 777b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return -EREMOTEIO; 778b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 779b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 780b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return 0; 781b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran} 782b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran 783f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected 784f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// route, to the main table as well. 785f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// Returns 0 on success or negative errno on failure. 786eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram RamachandranWARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination, 787eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, RouteController::TableType tableType) { 7885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table; 78938b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran switch (tableType) { 79038b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran case RouteController::INTERFACE: { 79138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran table = getRouteTableForInterface(interface); 7925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 7945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 79538b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 79638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 79787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran case RouteController::LOCAL_NETWORK: { 79887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran table = ROUTE_TABLE_LOCAL_NETWORK; 79987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran break; 80087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 8015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_NETWORK: { 8024acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_NETWORK; 80338b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 80438b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_SYSTEM: { 8064acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_SYSTEM; 80738b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 80838b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 80938b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8109c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 811f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti int ret = modifyIpRoute(action, table, interface, destination, nexthop); 8121077d298655efa7755925e788d49a73e9db10afcSreeram Ramachandran // We allow apps to call requestRouteToHost() multiple times with the same route, so ignore 8131077d298655efa7755925e788d49a73e9db10afcSreeram Ramachandran // EEXIST failures when adding routes to legacy tables. 8145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST && 81587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran (tableType == RouteController::LEGACY_NETWORK || 81687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran tableType == RouteController::LEGACY_SYSTEM))) { 817f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 818c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 819c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 820f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return 0; 8219c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 8229c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 823f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 824f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int flushRoutes(const char* interface) { 82592b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 8265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 827f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ESRCH; 82892b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 82992b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 830357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti char tableString[UINT32_STRLEN]; 831357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti snprintf(tableString, sizeof(tableString), "%u", table); 832357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 83399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int ret = 0; 834f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 835357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti const char* argv[] = { 836357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti IP_PATH, 837f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran IP_VERSIONS[i], 83872999d6cfc1df23cd911b85730f1f532fb62bed4Sreeram Ramachandran "route", 839357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "flush", 840357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "table", 841357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti tableString, 842357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti }; 84399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 84499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // A flush works by dumping routes and deleting each route as it's returned, and it can 84599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // fail if something else deletes the route between the dump and the delete. This can 84699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // happen, for example, if an interface goes down while we're trying to flush its routes. 84799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // So try multiple times and only return an error if the last attempt fails. 84899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // 84999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // TODO: replace this with our own netlink code. 85099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti unsigned attempts = 0; 85199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int err; 85299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti do { 85399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti err = android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), 85499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti NULL, false, false); 85599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ++attempts; 85699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } while (err != 0 && attempts < ROUTE_FLUSH_ATTEMPTS); 85799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (err) { 85899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ALOGE("failed to flush %s routes in table %s after %d attempts", 85999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti IP_VERSIONS[i], tableString, attempts); 86099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ret = -EREMOTEIO; 861357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 862357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 863357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 86499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // If we failed to flush routes, the caller may elect to keep this interface around, so keep 86599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // track of its name. 86699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (!ret) { 86799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti interfaceToTable.erase(interface); 86899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } 86999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 87099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti return ret; 87192b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 87292b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 8735c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} // namespace 8745c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 87587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::Init(unsigned localNetId) { 876b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (int ret = flushRules()) { 877b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 878b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 87987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = addLegacyRouteRules()) { 880f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 881f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 882fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addLocalNetworkRules(localNetId)) { 883b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 884f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 885a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti if (int ret = addDirectlyConnectedRule()) { 886a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return ret; 887a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti } 888fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addUnreachableRule()) { 88987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 89087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 8914acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 892f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 8938fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 8948fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 8956a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { 89687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_ADD); 8976a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 8986a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 8996a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { 90087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_DEL); 9016a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9026a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 9045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9054acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { 9064acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9074acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9084acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9094acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9105c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 9115c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 9125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 9135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 915f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 916f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 9174acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 9184acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9194acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9204acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9214acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 922379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 923379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 9245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 92595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 92695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 9274acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 9284acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9294acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9304acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9314acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9324043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 9334043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 9345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 93595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 93695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 9375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 9384043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return ret; 9394043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 9404acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 9414acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9424acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9434acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9444acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9454043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 9464043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 9475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 9485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission oldPermission, 9495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission newPermission) { 950379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 9515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 952f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 953f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 9545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 955b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 956b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 95795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranint RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure, 9585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 95995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 9605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 961b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 962b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 9635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 96495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 96595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 9665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 9679c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 9689c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 9695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 9705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 9719c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 9729c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 9735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 9745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 9765c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 9777619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 978f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 979eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran TableType tableType) { 980eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 9817619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 9827619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 983f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colittiint RouteController::removeRoute(const char* interface, const char* destination, 984eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, TableType tableType) { 985eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 9867619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 98787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 98887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { 989fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface); 99087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 99187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 99287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { 993fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface); 99487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 99548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 99648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface, 99748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 99848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission); 99948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 100048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 100148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId, 100248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 100348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 100448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission); 100548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 1006