RouteController.cpp revision f65122c81c824940ba93666d961c8d3fd76f3a9c
15c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran/* 25c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Copyright (C) 2014 The Android Open Source Project 35c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 45c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Licensed under the Apache License, Version 2.0 (the "License"); 55c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * you may not use this file except in compliance with the License. 65c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * You may obtain a copy of the License at 75c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 85c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * http://www.apache.org/licenses/LICENSE-2.0 95c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 105c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Unless required by applicable law or agreed to in writing, software 115c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * distributed under the License is distributed on an "AS IS" BASIS, 125c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 135c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * See the License for the specific language governing permissions and 145c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * limitations under the License. 155c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran */ 165c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 175c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "RouteController.h" 185c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 19aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <arpa/inet.h> 20aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <errno.h> 21aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <fcntl.h> 22aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <linux/fib_rules.h> 23aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <net/if.h> 24aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <sys/stat.h> 25aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert 26bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes#include <private/android_filesystem_config.h> 27bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes 28aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <map> 29aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert 305c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "Fwmark.h" 31b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran#include "UidRanges.h" 323667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti#include "DummyNetwork.h" 33f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 34bbd5626b3d0994ff0ecbfceac75f6dc4abfb55c6Elliott Hughes#include "android-base/file.h" 35f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#define LOG_TAG "Netd" 36f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "log/log.h" 37f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "logwrap/logwrap.h" 383667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti#include "netutils/ifc.h" 395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran#include "resolv_netid.h" 405c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 415407e14fd3d81bb76f94221b4a359faa2806de65Dan Albertusing android::base::WriteStringToFile; 425407e14fd3d81bb76f94221b4a359faa2806de65Dan Albert 435c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandrannamespace { 445c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 45f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// BEGIN CONSTANTS -------------------------------------------------------------------------------- 46f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000; 4857947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitticonst uint32_t RULE_PRIORITY_VPN_OVERRIDE_OIF = 10500; 49111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL = 11000; 505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_SECURE_VPN = 12000; 515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; 525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; 535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; 545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; 556a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranconst uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; 5687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t RULE_PRIORITY_TETHERING = 18000; 575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000; 5895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranconst uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000; 5948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000; 605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; 61a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitticonst uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000; 62db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitticonst uint32_t RULE_PRIORITY_UNREACHABLE = 32000; 635c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 6487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97; 654acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98; 664acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99; 674acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 6887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network"; 694acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network"; 704acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system"; 714acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 72bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL = "local"; 73bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_MAIN = "main"; 74bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 755965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not 765965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make 775965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert 785965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// that will warn us if upstream has given these values some other meaning. 795965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_START = 18; 805965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_END = 19; 815965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colittistatic_assert(FRA_UID_START > FRA_MAX, 825965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. " 835965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Check that these values match what the kernel does and then update this assertion."); 845965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 8572723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK; 8672723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL; 874753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 88f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0}; 89f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 90f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; 91f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 92f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst char* const IP_VERSIONS[] = {"-4", "-6"}; 93f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uid_t UID_ROOT = 0; 955ad4e98f7b566ffde39491ee4e80d4a15507f053Lorenzo Colitticonst char* const IIF_LOOPBACK = "lo"; 9687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const IIF_NONE = NULL; 975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst char* const OIF_NONE = NULL; 985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_ADD = true; 995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_DEL = false; 1005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool MODIFY_NON_UID_BASED_RULES = true; 1015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 1024acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 103c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r-- 1044acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 10599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitticonst unsigned ROUTE_FLUSH_ATTEMPTS = 2; 10699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 107f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" 108f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). 109f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconstexpr uint16_t U16_RTA_LENGTH(uint16_t x) { 110f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return RTA_LENGTH(x); 111f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran} 112f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 113f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// These are practically const, but can't be declared so, because they are used to initialize 114f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// non-const pointers ("void* iov_base") in iovec arrays. 115f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; 116f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; 117f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; 118f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; 119f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START }; 120f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END }; 121f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 122f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; 123f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; 124f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 125f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranuint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; 126f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 127f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// END CONSTANTS ---------------------------------------------------------------------------------- 128f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 1294acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// No locks needed because RouteController is accessed only from one thread (in CommandListener). 1304acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranstd::map<std::string, uint32_t> interfaceToTable; 131a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen 1325c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranuint32_t getRouteTableForInterface(const char* interface) { 133a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran uint32_t index = if_nametoindex(interface); 134a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen if (index) { 1354acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; 1364acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran interfaceToTable[interface] = index; 1374acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return index; 1384acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1394acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // If the interface goes away if_nametoindex() will return 0 but we still need to know 1404acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // the index so we can remove the rules and routes. 1414acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran auto iter = interfaceToTable.find(interface); 1424acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (iter == interfaceToTable.end()) { 1434acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 1444acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return RT_TABLE_UNSPEC; 1454acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1464acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return iter->second; 1474acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1484acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1494acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid addTableName(uint32_t table, const std::string& name, std::string* contents) { 1504acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran char tableString[UINT32_STRLEN]; 1514acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran snprintf(tableString, sizeof(tableString), "%u", table); 1524acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += tableString; 1534acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += " "; 1544acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += name; 1554acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += "\n"; 1564acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1574acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1584acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// Doesn't return success/failure as the file is optional; it's okay if we fail to update it. 1594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid updateTableNamesFile() { 1604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran std::string contents; 161bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 162bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents); 163bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents); 164bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 16587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents); 1664acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); 1674acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); 168bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 1694acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran for (const auto& entry : interfaceToTable) { 1704acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(entry.second, entry.first, &contents); 1714acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1724acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1735407e14fd3d81bb76f94221b4a359faa2806de65Dan Albert if (!WriteStringToFile(contents, RT_TABLES_PATH, RT_TABLES_MODE, AID_SYSTEM, AID_WIFI)) { 174bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes ALOGE("failed to write to %s (%s)", RT_TABLES_PATH, strerror(errno)); 1754acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return; 176a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen } 1775c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 1785c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1794753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Sends a netlink request and expects an ack. 1804753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// |iov| is an array of struct iovec that contains the netlink message payload. 1814753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// The netlink header is generated by this function based on |action| and |flags|. 1824753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Returns -errno if there was an error or if the kernel reported an error. 183f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov 184f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov// Disable optimizations in ASan build. 185f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov// ASan reports an out-of-bounds 32-bit(!) access in the first loop of the 186f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov// function (over iov[]). 187f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov#ifdef __clang__ 188f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov#if __has_feature(address_sanitizer) 189f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov__attribute__((optnone)) 190f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov#endif 191f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov#endif 192f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) { 1934753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr nlmsg = { 1944753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_type = action, 1954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_flags = flags, 1964753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 1974753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_base = &nlmsg; 1984753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_len = sizeof(nlmsg); 1994753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti for (int i = 0; i < iovlen; ++i) { 2004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsg.nlmsg_len += iov[i].iov_len; 2014753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2024753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2034753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int ret; 2044753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti struct { 2054753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr msg; 2064753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsgerr err; 2074753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } response; 2084753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 20953ea9cadf6cc5f8be1c16b5b6b660cd7366fd3f0Nick Kralevich int sock = socket(AF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_ROUTE); 2104753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1 && 211f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS), 212f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran sizeof(NETLINK_ADDRESS)) != -1 && 2134753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti writev(sock, iov, iovlen) != -1 && 2144753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti (ret = recv(sock, &response, sizeof(response), 0)) != -1) { 2154753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (ret == sizeof(response)) { 2164753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = response.err.error; // Netlink errors are negative errno. 217f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret) { 218f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink response contains error (%s)", strerror(-ret)); 219f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 2204753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 2211201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response)); 2224753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -EBADMSG; 2234753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2244753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 225f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno)); 2264753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -errno; 2274753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2284753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2294753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1) { 2304753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti close(sock); 2314753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2324753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2334753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return ret; 2344753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti} 2354753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 23687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 23787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { 23887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (!input) { 23987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = 0; 24087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = 0; 24187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 24287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 24387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = strlcpy(name, input, IFNAMSIZ) + 1; 24487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (*length > IFNAMSIZ) { 24587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); 24687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return -ENAMETOOLONG; 24787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 24887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); 24987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 25087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 25187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 2528fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 2538fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 2546b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti// + If |priority| is RULE_PRIORITY_UNREACHABLE, the rule returns ENETUNREACH (i.e., specifies an 2556b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti// action of FR_ACT_UNREACHABLE). Otherwise, the rule specifies an action of FR_ACT_TO_TBL. 2566b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the table is 2576b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti// unspecified. An unspecified table is only allowed when deleting a rule. 2588fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 2598fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 26087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |iif| is non-NULL, the rule matches the specified incoming interface. 26187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |oif| is non-NULL, the rule matches the specified outgoing interface. 26287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that 26387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// range (inclusive). Otherwise, the rule matches packets from all UIDs. 26496f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// 26596f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// Returns 0 on success or negative errno on failure. 266f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 26787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask, const char* iif, 26887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran const char* oif, uid_t uidStart, uid_t uidEnd) { 269f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 270f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (fwmark & ~mask) { 271f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 272f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ERANGE; 273f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 274f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 27587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran // Interface names must include exactly one terminating NULL and be properly padded, or older 2764753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // kernels will refuse to delete rules. 27787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; 27887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran size_t iifLength, oifLength; 27987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint16_t iifPadding, oifPadding; 28087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { 28187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 28287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 28387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { 28487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 2854753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2867619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2875965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti // Either both start and end UID must be specified, or neither. 288f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 289cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 2905965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti return -EUSERS; 2915965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti } 29272723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti bool isUidRule = (uidStart != INVALID_UID); 2935965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 2944753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rule request and put it in an array of iovec structures. 2954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti fib_rule_hdr rule = { 2966b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti .action = static_cast<uint8_t>(priority != RULE_PRIORITY_UNREACHABLE ? FR_ACT_TO_TBL : 2976b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti FR_ACT_UNREACHABLE), 2986b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // Note that here we're implicitly setting rule.table to 0. When we want to specify a 2996b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // non-zero table, we do this via the FRATTR_TABLE attribute. 3004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 301a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 3026b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // Don't ever create a rule that looks up table 0, because table 0 is the local table. 3036b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // It's OK to specify a table ID of 0 when deleting a rule, because that doesn't actually select 3046b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // table 0, it's a wildcard that matches anything. 3056b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (table == RT_TABLE_UNSPEC && rule.action == FR_ACT_TO_TBL && action != RTM_DELRULE) { 3066b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti ALOGE("RT_TABLE_UNSPEC only allowed when deleting rules"); 3076b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return -ENOTUNIQ; 3086b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 3096b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti 31087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; 31187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; 312a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 3134753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iovec iov[] = { 314f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 315f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rule, sizeof(rule) }, 316f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 317f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &priority, sizeof(priority) }, 3185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 3195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 320f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 321f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &fwmark, mask ? sizeof(fwmark) : 0 }, 322f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 323f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &mask, mask ? sizeof(mask) : 0 }, 324f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 }, 325f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidStart, isUidRule ? sizeof(uidStart) : 0 }, 326f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 }, 327f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 }, 32887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, 32987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { iifName, iifLength }, 33087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, iifPadding }, 33187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, 33287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { oifName, oifLength }, 33387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, oifPadding }, 3344753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 3354753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 33672723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; 337f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 338f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rule.family = AF_FAMILIES[i]; 339f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) { 34096f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return ret; 3415c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3425c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3435c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 34496f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return 0; 3455c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 3465c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 34787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 34887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask) { 34987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, 35087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID); 35187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 35287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 353ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Adds or deletes an IPv4 or IPv6 route. 354ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Returns 0 on success or negative errno on failure. 355f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 356f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran const char* destination, const char* nexthop) { 357ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // At least the destination must be non-null. 358ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!destination) { 359f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("null destination"); 360ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EFAULT; 361ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 362ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 363ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // Parse the prefix. 364ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawAddress[sizeof(in6_addr)]; 365f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t family; 366f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t prefixLength; 367ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 368ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti &prefixLength); 369ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (rawLength < 0) { 370f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 371ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return rawLength; 372ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 3737619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 374ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 3751201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 376ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 377ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 378ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 379de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t type = RTN_UNICAST; 380ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint32_t ifindex; 381de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t rawNexthop[sizeof(in6_addr)]; 382de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran 383de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && !strcmp(nexthop, "unreachable")) { 384de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran type = RTN_UNREACHABLE; 385de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup 386de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for 387de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.) 388de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran interface = OIF_NONE; 389de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran nexthop = NULL; 3904c95a125e0930c112555437589f7620575482095Lorenzo Colitti } else if (nexthop && !strcmp(nexthop, "throw")) { 3914c95a125e0930c112555437589f7620575482095Lorenzo Colitti type = RTN_THROW; 3924c95a125e0930c112555437589f7620575482095Lorenzo Colitti interface = OIF_NONE; 3934c95a125e0930c112555437589f7620575482095Lorenzo Colitti nexthop = NULL; 394de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } else { 395de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If an interface was specified, find the ifindex. 396de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (interface != OIF_NONE) { 397de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ifindex = if_nametoindex(interface); 398de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (!ifindex) { 399de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 400de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -ENODEV; 401de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 4027619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 4037619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 404de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If a nexthop was specified, parse it as the same family as the prefix. 405de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 406de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("inet_pton failed for nexthop %s", nexthop); 407de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -EINVAL; 408de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 409ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 410ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 4114753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rtmsg and put it in an array of iovec structures. 412f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtmsg route = { 413ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_protocol = RTPROT_STATIC, 414de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran .rtm_type = type, 415ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_family = family, 416ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_dst_len = prefixLength, 4172bff72e0cf091f4d71af0c81cfc74e8ebd8c6644Sreeram Ramachandran .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK), 418ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 4194753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 420f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 421f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 422ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 423ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti iovec iov[] = { 424f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 425f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &route, sizeof(route) }, 426f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 427f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &table, sizeof(table) }, 428f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaDst, sizeof(rtaDst) }, 429f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawAddress, static_cast<size_t>(rawLength) }, 4305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 4315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 432f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 433f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 434ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 435ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 436f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : 437f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran NETLINK_REQUEST_FLAGS; 4384753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov)); 4397619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 4407619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 4415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// An iptables rule to mark incoming packets on a network with the netId of the network. 4425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is so that the kernel can: 4445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 4455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// replies, SYN-ACKs, etc). 4465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Mark sockets that accept connections from this interface so that the connection stays on the 4475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// same interface. 4485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 4495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 4535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = true; 4555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 457b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran char markString[UINT32_HEX_STRLEN]; 4585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue); 4595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 460b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j", 461b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran "MARK", "--set-mark", markString, NULL)) { 462b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran ALOGE("failed to change iptables rule that sets incoming packet mark"); 463b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return -EREMOTEIO; 464b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 4655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 466b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 467b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 468b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 469111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// A rule to route responses to the local network forwarded via the VPN. 470111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// 471111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// When a VPN is in effect, packets from the local network to upstream networks are forwarded into 472111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel. 473111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) { 474111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL, 475111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE, 476111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran INVALID_UID, INVALID_UID); 477111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran} 478111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran 479fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to route all traffic from a given set of UIDs to go over the VPN. 480fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 481fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 482fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 483fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// bypass the VPN if the protectedFromVpn bit is set. 484fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 48595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, bool add) { 486fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 487fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 488fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 489fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.protectedFromVpn = false; 490fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.protectedFromVpn = true; 491fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 49295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority; 49395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 49495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (secure) { 49595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_SECURE_VPN; 49695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } else { 49795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_BYPASSABLE_VPN; 49895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 49995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran fwmark.explicitlySelected = false; 50095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.explicitlySelected = true; 50195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } 50295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 50395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 5045ad4e98f7b566ffde39491ee4e80d4a15507f053Lorenzo Colitti mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd); 505fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 506fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 507fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 508fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// set of UIDs. 509fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 510fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 511fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// target set, but where the DnsProxyListener itself is not. 51295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure, 51395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool add) { 514fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 515fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 516fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 517fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.netId = netId; 518fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 519fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 520fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 521fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 522fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 52395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN; 52495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 52595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 52695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue); 527fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 528fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 5295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on an explicitly chosen network. 5305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 5325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 5345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// to check it again in the rules here, because a network's permissions may have been updated via 5355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// modifyNetworkPermission(). 5365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 5375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 539eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark fwmark; 540eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark mask; 541eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 542eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran fwmark.netId = netId; 543eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 544eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 5465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 547eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 5505c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 55287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); 5535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5545c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on a chosen outgoing interface. 5565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 5585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// the outgoing interface (typically for link-local communications). 55957947f02c00bb03651e3f9427c880211c689db7fLorenzo ColittiWARN_UNUSED_RESULT int modifyOutputInterfaceRules(const char* interface, uint32_t table, 56057947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti Permission permission, uid_t uidStart, 56157947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti uid_t uidEnd, bool add) { 562122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 563122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 5645c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 565f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 566f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran mask.permission = permission; 5675c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 56857947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti // If this rule does not specify a UID range, then also add a corresponding high-priority rule 56957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti // for UID. This covers forwarded packets and system daemons such as the tethering DHCP server. 57057947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (uidStart == INVALID_UID && uidEnd == INVALID_UID) { 57157947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OVERRIDE_OIF, 57257947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti table, fwmark.intValue, mask.intValue, IIF_NONE, interface, 57357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti UID_ROOT, UID_ROOT)) { 57457947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti return ret; 57557947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti } 57657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti } 57757947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti 5785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 57987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd); 5805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5815009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5825009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on the chosen network. 5835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is for sockets that have not explicitly requested a particular network, but have been 5855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bound to one when they called connect(). This ensures that sockets connected on a particular 5865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// network stay on that network even if the default network changes. 5875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, 5885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 5895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 592122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 593122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 594122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 5955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 596122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 5975c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 600eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 6015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 60287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 6035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6045c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 60548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// A rule to enable split tunnel VPNs. 60648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// 60748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to 60848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// go over the default network, provided it wasn't explicitly restricted to the VPN and has the 60948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// permissions required by the default network. 61048e19b037e7e20674048ef76bf31ce65c741347cSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId, 61148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 61248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 61348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran uint32_t table = getRouteTableForInterface(physicalInterface); 61448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 61548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return -ESRCH; 61648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran } 61748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 61848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark fwmark; 61948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark mask; 62048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 62148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.netId = vpnNetId; 62248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 62348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 62448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.explicitlySelected = false; 62548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.explicitlySelected = true; 62648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 62748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.permission = permission; 62848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.permission = permission; 62948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 63048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue, 63148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.intValue); 63248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 63348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 634fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to allow legacy routes added through the requestRouteToHost() API. 635fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLegacyRouteRules() { 6365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 639fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 640fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 642fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // Rules to allow legacy routes to override the default network. 643fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 644fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue)) { 645fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 646fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 647fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 648fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { 649fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 650fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 651fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 652fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 653fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 654fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 655fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // A rule to allow legacy routes from system apps to override VPNs. 656fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 657fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue); 6585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 660fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to lookup the local network when specified explicitly or otherwise. 661fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) { 662fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 663fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran INVALID_UID, INVALID_UID, ACTION_ADD)) { 664fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 665fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 666fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 6675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 670fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 671fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 673fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, 67487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 6755c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 6765c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 6773667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colittiint configureDummyNetwork() { 6783667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti const char *interface = DummyNetwork::INTERFACE_NAME; 6793667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti uint32_t table = getRouteTableForInterface(interface); 6803667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (table == RT_TABLE_UNSPEC) { 6813667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // getRouteTableForInterface has already looged an error. 6823667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -ESRCH; 6833667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6843667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6853667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_init(); 6863667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti int ret = ifc_up(interface); 6873667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_close(); 6883667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (ret) { 6893667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't bring up %s: %s", interface, strerror(errno)); 6903667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -errno; 6913667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6923667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 69357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if ((ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, 69457947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti INVALID_UID, INVALID_UID, ACTION_ADD))) { 69557947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti ALOGE("Can't create oif rules for %s: %s", interface, strerror(-ret)); 6963667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6973667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6983667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6993667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "0.0.0.0/0", NULL))) { 7003667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't add IPv4 default route to %s: %s", interface, strerror(-ret)); 7013667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 7023667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 7033667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 7043667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "::/0", NULL))) { 7053667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't add IPv6 default route to %s: %s", interface, strerror(-ret)); 7063667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 7073667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 7083667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 7093667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return 0; 7103667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti} 7113667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 712a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti// Add a new rule to look up the 'main' table, with the same selectors as the "default network" 713db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule, but with a lower priority. We will never create routes in the main table; it should only be 714db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// used for directly-connected routes implicitly created by the kernel when adding IP addresses. 715db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// This is necessary, for example, when adding a route through a directly-connected gateway: in 716db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// order to add the route, there must already be a directly-connected route that covers the gateway. 717a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo ColittiWARN_UNUSED_RESULT int addDirectlyConnectedRule() { 718a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark fwmark; 719a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark mask; 720a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 721a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.netId = NETID_UNSET; 722a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti mask.netId = FWMARK_NET_ID_MASK; 723a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 724a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN, 725a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, UID_ROOT, UID_ROOT); 726a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti} 727a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 728db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that 729db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended 730db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable 731db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule will hopefully make things even clearer. 732fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addUnreachableRule() { 733fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET, 734fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran MARK_UNSET); 73587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 73687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 73787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { 7386a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 7396a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 7406a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 74157947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti return modifyOutputInterfaceRules(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 74257947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti INVALID_UID, INVALID_UID, add); 7436a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 7446a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 7455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface, 7465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 7474043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7494043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return -ESRCH; 7504043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 7514043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 7535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 7565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 75957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyOutputInterfaceRules(interface, table, permission, INVALID_UID, INVALID_UID, 7605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyImplicitNetworkRule(netId, table, permission, add); 7645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 7654043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface, 76795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran const UidRanges& uidRanges, bool secure, bool add, 7685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran bool modifyNonUidBasedRules) { 7695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 7725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 773b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 774e09b20aee85f1dfd8c18c3d8581ac875d939ba70Sreeram Ramachandran for (const UidRanges::Range& range : uidRanges.getRanges()) { 77595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, secure, add)) { 776fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 777fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 7785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first, 7795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 780b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 781b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 78257947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, range.first, 78357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti range.second, add)) { 784b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 785b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 787eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 7885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (modifyNonUidBasedRules) { 7895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 790b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 791b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 792111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran if (int ret = modifyVpnOutputToLocalRule(interface, add)) { 793111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return ret; 794111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran } 79595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) { 796b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 797b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 798fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add); 799b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 8004043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 801b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 8024043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 8034043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 8045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface, 8055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 8069c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 8075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 80896f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return -ESRCH; 8099c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 8109c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 811122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 812122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 813f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 8145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 815122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 816f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 817f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 818122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 8199c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 8205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 82187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran mask.intValue); 8227619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 8237619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 824fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyTetheredNetwork(uint16_t action, const char* inputInterface, 825fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran const char* outputInterface) { 826fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran uint32_t table = getRouteTableForInterface(outputInterface); 827fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 828fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return -ESRCH; 829fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 830fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 831fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, 832fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 833fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 834fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 835b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 836b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram RamachandranWARN_UNUSED_RESULT int flushRules() { 837b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 838b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran const char* argv[] = { 839b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_PATH, 840b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_VERSIONS[i], 841b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "rule", 842b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "flush", 843b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran }; 844b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { 845b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran ALOGE("failed to flush rules"); 846b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return -EREMOTEIO; 847b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 848b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 849b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return 0; 850b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran} 851b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran 852f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected 853f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// route, to the main table as well. 854f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// Returns 0 on success or negative errno on failure. 855eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram RamachandranWARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination, 856eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, RouteController::TableType tableType) { 8575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table; 85838b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran switch (tableType) { 85938b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran case RouteController::INTERFACE: { 86038b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran table = getRouteTableForInterface(interface); 8615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 8625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 8635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 86438b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 86538b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 86687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran case RouteController::LOCAL_NETWORK: { 86787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran table = ROUTE_TABLE_LOCAL_NETWORK; 86887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran break; 86987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 8705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_NETWORK: { 8714acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_NETWORK; 87238b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 87338b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_SYSTEM: { 8754acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_SYSTEM; 87638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 87738b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 87838b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8799c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 880f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti int ret = modifyIpRoute(action, table, interface, destination, nexthop); 8810321315d4e94dacd5ef2e0de217059cbc72d803dSreeram Ramachandran // Trying to add a route that already exists shouldn't cause an error. 8820321315d4e94dacd5ef2e0de217059cbc72d803dSreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { 883f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 884c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 885c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 886f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return 0; 8879c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 8889c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 889f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 890f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int flushRoutes(const char* interface) { 89192b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 8925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 893f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ESRCH; 89492b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 89592b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 896357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti char tableString[UINT32_STRLEN]; 897357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti snprintf(tableString, sizeof(tableString), "%u", table); 898357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 89999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int ret = 0; 900f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 901357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti const char* argv[] = { 902357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti IP_PATH, 903f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran IP_VERSIONS[i], 90472999d6cfc1df23cd911b85730f1f532fb62bed4Sreeram Ramachandran "route", 905357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "flush", 906357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "table", 907357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti tableString, 908357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti }; 90999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 91099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // A flush works by dumping routes and deleting each route as it's returned, and it can 91199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // fail if something else deletes the route between the dump and the delete. This can 91299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // happen, for example, if an interface goes down while we're trying to flush its routes. 91399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // So try multiple times and only return an error if the last attempt fails. 91499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // 91599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // TODO: replace this with our own netlink code. 91699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti unsigned attempts = 0; 91799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int err; 91899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti do { 91999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti err = android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), 92099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti NULL, false, false); 92199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ++attempts; 92299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } while (err != 0 && attempts < ROUTE_FLUSH_ATTEMPTS); 92399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (err) { 92499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ALOGE("failed to flush %s routes in table %s after %d attempts", 92599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti IP_VERSIONS[i], tableString, attempts); 92699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ret = -EREMOTEIO; 927357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 928357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 929357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 93099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // If we failed to flush routes, the caller may elect to keep this interface around, so keep 93199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // track of its name. 93299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (!ret) { 93399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti interfaceToTable.erase(interface); 93499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } 93599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 93699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti return ret; 93792b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 93892b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 9396b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo ColittiWARN_UNUSED_RESULT int clearTetheringRules(const char* inputInterface) { 9406b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti int ret = 0; 9416b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti while (ret == 0) { 9426b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti ret = modifyIpRule(RTM_DELRULE, RULE_PRIORITY_TETHERING, 0, MARK_UNSET, MARK_UNSET, 9436b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 9446b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 9456b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti 9466b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (ret == -ENOENT) { 9476b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return 0; 9486b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } else { 9496b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return ret; 9506b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 9516b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti} 9526b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti 9535c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} // namespace 9545c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 95587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::Init(unsigned localNetId) { 956b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (int ret = flushRules()) { 957b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 958b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 95987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = addLegacyRouteRules()) { 960f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 961f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 962fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addLocalNetworkRules(localNetId)) { 963b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 964f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 965a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti if (int ret = addDirectlyConnectedRule()) { 966a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return ret; 967a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti } 968fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addUnreachableRule()) { 96987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 97087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 9713667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // Don't complain if we can't add the dummy network, since not all devices support it. 9723667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti configureDummyNetwork(); 9733667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 9744acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 975f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 9768fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 9778fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 9786a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { 97987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_ADD); 9806a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9816a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9826a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { 98387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_DEL); 9846a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9856a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 9875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9884acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { 9894acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9904acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9914acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9924acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9935c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 9945c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 9955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 9965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 998f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 999f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 10004acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 10014acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 10024acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 10036b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (int ret = clearTetheringRules(interface)) { 10046b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return ret; 10056b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 10064acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 10074acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 1008379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 1009379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 10105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 101195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 101295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 10134acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 10144acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 10154acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 10164acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 10174acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 10184043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 10194043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 10205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 102195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 102295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 10235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 10244043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return ret; 10254043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 10264acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 10274acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 10284acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 10294acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 10304acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 10314043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 10324043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 10335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 10345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission oldPermission, 10355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission newPermission) { 1036379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 10375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 1038f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 1039f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 10405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 1041b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1042b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 104395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranint RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure, 10445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 104595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 10465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 1047b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1048b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 10495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 105095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 105195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 10525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 10539c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10549c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 10565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 10579c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10589c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 10605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 10615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 10625c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 10637619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1064f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 1065eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran TableType tableType) { 1066eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 10677619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 10687619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1069f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colittiint RouteController::removeRoute(const char* interface, const char* destination, 1070eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, TableType tableType) { 1071eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 10727619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 107387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 107487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { 1075fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface); 107687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 107787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 107887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { 1079fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface); 108087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 108148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 108248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface, 108348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 108448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission); 108548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 108648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 108748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId, 108848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 108948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 109048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission); 109148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 1092