RouteController.cpp revision 5407e14fd3d81bb76f94221b4a359faa2806de65
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 345407e14fd3d81bb76f94221b4a359faa2806de65Dan Albert#include "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. 183f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) { 1844753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr nlmsg = { 1854753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_type = action, 1864753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_flags = flags, 1874753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 1884753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_base = &nlmsg; 1894753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_len = sizeof(nlmsg); 1904753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti for (int i = 0; i < iovlen; ++i) { 1914753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsg.nlmsg_len += iov[i].iov_len; 1924753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1934753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1944753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int ret; 1954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti struct { 1964753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr msg; 1974753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsgerr err; 1984753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } response; 1994753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 20053ea9cadf6cc5f8be1c16b5b6b660cd7366fd3f0Nick Kralevich int sock = socket(AF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_ROUTE); 2014753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1 && 202f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS), 203f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran sizeof(NETLINK_ADDRESS)) != -1 && 2044753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti writev(sock, iov, iovlen) != -1 && 2054753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti (ret = recv(sock, &response, sizeof(response), 0)) != -1) { 2064753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (ret == sizeof(response)) { 2074753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = response.err.error; // Netlink errors are negative errno. 208f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret) { 209f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink response contains error (%s)", strerror(-ret)); 210f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 2114753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 2121201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response)); 2134753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -EBADMSG; 2144753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2154753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 216f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno)); 2174753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -errno; 2184753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2194753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2204753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1) { 2214753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti close(sock); 2224753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2234753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2244753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return ret; 2254753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti} 2264753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 22787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 22887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { 22987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (!input) { 23087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = 0; 23187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = 0; 23287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 23387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 23487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = strlcpy(name, input, IFNAMSIZ) + 1; 23587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (*length > IFNAMSIZ) { 23687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); 23787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return -ENAMETOOLONG; 23887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 23987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); 24087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 24187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 24287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 2438fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 2448fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 2456b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti// + If |priority| is RULE_PRIORITY_UNREACHABLE, the rule returns ENETUNREACH (i.e., specifies an 2466b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti// action of FR_ACT_UNREACHABLE). Otherwise, the rule specifies an action of FR_ACT_TO_TBL. 2476b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the table is 2486b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti// unspecified. An unspecified table is only allowed when deleting a rule. 2498fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 2508fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 25187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |iif| is non-NULL, the rule matches the specified incoming interface. 25287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |oif| is non-NULL, the rule matches the specified outgoing interface. 25387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that 25487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// range (inclusive). Otherwise, the rule matches packets from all UIDs. 25596f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// 25696f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// Returns 0 on success or negative errno on failure. 257f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 25887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask, const char* iif, 25987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran const char* oif, uid_t uidStart, uid_t uidEnd) { 260f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 261f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (fwmark & ~mask) { 262f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 263f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ERANGE; 264f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 265f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 26687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran // Interface names must include exactly one terminating NULL and be properly padded, or older 2674753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // kernels will refuse to delete rules. 26887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; 26987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran size_t iifLength, oifLength; 27087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint16_t iifPadding, oifPadding; 27187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { 27287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 27387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 27487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { 27587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 2764753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2777619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2785965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti // Either both start and end UID must be specified, or neither. 279f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 280cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 2815965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti return -EUSERS; 2825965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti } 28372723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti bool isUidRule = (uidStart != INVALID_UID); 2845965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 2854753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rule request and put it in an array of iovec structures. 2864753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti fib_rule_hdr rule = { 2876b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti .action = static_cast<uint8_t>(priority != RULE_PRIORITY_UNREACHABLE ? FR_ACT_TO_TBL : 2886b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti FR_ACT_UNREACHABLE), 2896b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // Note that here we're implicitly setting rule.table to 0. When we want to specify a 2906b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // non-zero table, we do this via the FRATTR_TABLE attribute. 2914753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 292a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 2936b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // Don't ever create a rule that looks up table 0, because table 0 is the local table. 2946b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // It's OK to specify a table ID of 0 when deleting a rule, because that doesn't actually select 2956b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // table 0, it's a wildcard that matches anything. 2966b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (table == RT_TABLE_UNSPEC && rule.action == FR_ACT_TO_TBL && action != RTM_DELRULE) { 2976b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti ALOGE("RT_TABLE_UNSPEC only allowed when deleting rules"); 2986b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return -ENOTUNIQ; 2996b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 3006b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti 30187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; 30287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; 303a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 3044753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iovec iov[] = { 305f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 306f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rule, sizeof(rule) }, 307f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 308f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &priority, sizeof(priority) }, 3095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 3105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 311f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 312f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &fwmark, mask ? sizeof(fwmark) : 0 }, 313f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 314f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &mask, mask ? sizeof(mask) : 0 }, 315f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 }, 316f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidStart, isUidRule ? sizeof(uidStart) : 0 }, 317f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 }, 318f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 }, 31987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, 32087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { iifName, iifLength }, 32187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, iifPadding }, 32287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, 32387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { oifName, oifLength }, 32487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, oifPadding }, 3254753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 3264753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 32772723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; 328f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 329f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rule.family = AF_FAMILIES[i]; 330f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) { 33196f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return ret; 3325c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3335c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3345c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 33596f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return 0; 3365c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 3375c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 33887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 33987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask) { 34087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, 34187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID); 34287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 34387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 344ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Adds or deletes an IPv4 or IPv6 route. 345ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Returns 0 on success or negative errno on failure. 346f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 347f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran const char* destination, const char* nexthop) { 348ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // At least the destination must be non-null. 349ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!destination) { 350f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("null destination"); 351ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EFAULT; 352ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 353ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 354ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // Parse the prefix. 355ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawAddress[sizeof(in6_addr)]; 356f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t family; 357f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t prefixLength; 358ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 359ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti &prefixLength); 360ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (rawLength < 0) { 361f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 362ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return rawLength; 363ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 3647619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 365ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 3661201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 367ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 368ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 369ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 370de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t type = RTN_UNICAST; 371ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint32_t ifindex; 372de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t rawNexthop[sizeof(in6_addr)]; 373de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran 374de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && !strcmp(nexthop, "unreachable")) { 375de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran type = RTN_UNREACHABLE; 376de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup 377de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for 378de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.) 379de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran interface = OIF_NONE; 380de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran nexthop = NULL; 3814c95a125e0930c112555437589f7620575482095Lorenzo Colitti } else if (nexthop && !strcmp(nexthop, "throw")) { 3824c95a125e0930c112555437589f7620575482095Lorenzo Colitti type = RTN_THROW; 3834c95a125e0930c112555437589f7620575482095Lorenzo Colitti interface = OIF_NONE; 3844c95a125e0930c112555437589f7620575482095Lorenzo Colitti nexthop = NULL; 385de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } else { 386de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If an interface was specified, find the ifindex. 387de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (interface != OIF_NONE) { 388de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ifindex = if_nametoindex(interface); 389de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (!ifindex) { 390de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 391de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -ENODEV; 392de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 3937619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 3947619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 395de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If a nexthop was specified, parse it as the same family as the prefix. 396de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 397de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("inet_pton failed for nexthop %s", nexthop); 398de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -EINVAL; 399de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 400ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 401ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 4024753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rtmsg and put it in an array of iovec structures. 403f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtmsg route = { 404ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_protocol = RTPROT_STATIC, 405de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran .rtm_type = type, 406ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_family = family, 407ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_dst_len = prefixLength, 4082bff72e0cf091f4d71af0c81cfc74e8ebd8c6644Sreeram Ramachandran .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK), 409ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 4104753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 411f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 412f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 413ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 414ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti iovec iov[] = { 415f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 416f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &route, sizeof(route) }, 417f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 418f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &table, sizeof(table) }, 419f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaDst, sizeof(rtaDst) }, 420f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawAddress, static_cast<size_t>(rawLength) }, 4215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 4225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 423f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 424f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 425ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 426ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 427f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : 428f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran NETLINK_REQUEST_FLAGS; 4294753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov)); 4307619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 4317619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 4325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// An iptables rule to mark incoming packets on a network with the netId of the network. 4335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is so that the kernel can: 4355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 4365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// replies, SYN-ACKs, etc). 4375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Mark sockets that accept connections from this interface so that the connection stays on the 4385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// same interface. 4395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 4405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 4445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = true; 4465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 448b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran char markString[UINT32_HEX_STRLEN]; 4495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue); 4505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 451b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j", 452b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran "MARK", "--set-mark", markString, NULL)) { 453b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran ALOGE("failed to change iptables rule that sets incoming packet mark"); 454b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return -EREMOTEIO; 455b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 4565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 457b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 458b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 459b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 460111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// A rule to route responses to the local network forwarded via the VPN. 461111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// 462111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// When a VPN is in effect, packets from the local network to upstream networks are forwarded into 463111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel. 464111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) { 465111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL, 466111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE, 467111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran INVALID_UID, INVALID_UID); 468111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran} 469111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran 470fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to route all traffic from a given set of UIDs to go over the VPN. 471fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 472fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 473fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 474fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// bypass the VPN if the protectedFromVpn bit is set. 475fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 47695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, bool add) { 477fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 478fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 479fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 480fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.protectedFromVpn = false; 481fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.protectedFromVpn = true; 482fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 48395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority; 48495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 48595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (secure) { 48695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_SECURE_VPN; 48795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } else { 48895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_BYPASSABLE_VPN; 48995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 49095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran fwmark.explicitlySelected = false; 49195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.explicitlySelected = true; 49295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } 49395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 49495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 4955ad4e98f7b566ffde39491ee4e80d4a15507f053Lorenzo Colitti mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd); 496fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 497fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 498fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 499fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// set of UIDs. 500fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 501fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 502fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// target set, but where the DnsProxyListener itself is not. 50395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure, 50495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool add) { 505fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 506fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 507fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 508fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.netId = netId; 509fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 510fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 511fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 512fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 513fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 51495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN; 51595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 51695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 51795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue); 518fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 519fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 5205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on an explicitly chosen network. 5215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 5235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 5255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// to check it again in the rules here, because a network's permissions may have been updated via 5265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// modifyNetworkPermission(). 5275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 5285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 530eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark fwmark; 531eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark mask; 532eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 533eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran fwmark.netId = netId; 534eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 535eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 5375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 538eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 5415c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 54387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); 5445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5455c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on a chosen outgoing interface. 5475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 5495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// the outgoing interface (typically for link-local communications). 55057947f02c00bb03651e3f9427c880211c689db7fLorenzo ColittiWARN_UNUSED_RESULT int modifyOutputInterfaceRules(const char* interface, uint32_t table, 55157947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti Permission permission, uid_t uidStart, 55257947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti uid_t uidEnd, bool add) { 553122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 554122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 5555c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 556f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 557f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran mask.permission = permission; 5585c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 55957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti // If this rule does not specify a UID range, then also add a corresponding high-priority rule 56057947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti // for UID. This covers forwarded packets and system daemons such as the tethering DHCP server. 56157947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (uidStart == INVALID_UID && uidEnd == INVALID_UID) { 56257947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OVERRIDE_OIF, 56357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti table, fwmark.intValue, mask.intValue, IIF_NONE, interface, 56457947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti UID_ROOT, UID_ROOT)) { 56557947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti return ret; 56657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti } 56757947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti } 56857947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti 5695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 57087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd); 5715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on the chosen network. 5745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is for sockets that have not explicitly requested a particular network, but have been 5765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bound to one when they called connect(). This ensures that sockets connected on a particular 5775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// network stay on that network even if the default network changes. 5785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, 5795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 5805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5815009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5825009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 583122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 584122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 585122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 5865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 587122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 5885c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 591eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 59387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 5945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5955c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 59648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// A rule to enable split tunnel VPNs. 59748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// 59848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to 59948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// go over the default network, provided it wasn't explicitly restricted to the VPN and has the 60048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// permissions required by the default network. 60148e19b037e7e20674048ef76bf31ce65c741347cSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId, 60248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 60348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 60448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran uint32_t table = getRouteTableForInterface(physicalInterface); 60548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 60648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return -ESRCH; 60748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran } 60848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 60948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark fwmark; 61048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark mask; 61148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 61248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.netId = vpnNetId; 61348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 61448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 61548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.explicitlySelected = false; 61648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.explicitlySelected = true; 61748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 61848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.permission = permission; 61948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.permission = permission; 62048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 62148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue, 62248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.intValue); 62348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 62448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 625fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to allow legacy routes added through the requestRouteToHost() API. 626fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLegacyRouteRules() { 6275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 630fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 631fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 633fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // Rules to allow legacy routes to override the default network. 634fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 635fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue)) { 636fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 637fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 638fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 639fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { 640fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 641fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 642fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 643fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 644fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 645fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 646fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // A rule to allow legacy routes from system apps to override VPNs. 647fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 648fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue); 6495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 651fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to lookup the local network when specified explicitly or otherwise. 652fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) { 653fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 654fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran INVALID_UID, INVALID_UID, ACTION_ADD)) { 655fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 656fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 657fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 6585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 661fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 662fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 664fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, 66587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 6665c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 6675c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 6683667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colittiint configureDummyNetwork() { 6693667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti const char *interface = DummyNetwork::INTERFACE_NAME; 6703667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti uint32_t table = getRouteTableForInterface(interface); 6713667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (table == RT_TABLE_UNSPEC) { 6723667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // getRouteTableForInterface has already looged an error. 6733667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -ESRCH; 6743667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6753667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6763667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_init(); 6773667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti int ret = ifc_up(interface); 6783667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_close(); 6793667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (ret) { 6803667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't bring up %s: %s", interface, strerror(errno)); 6813667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -errno; 6823667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6833667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 68457947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if ((ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, 68557947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti INVALID_UID, INVALID_UID, ACTION_ADD))) { 68657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti ALOGE("Can't create oif rules for %s: %s", interface, strerror(-ret)); 6873667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6883667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6893667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6903667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "0.0.0.0/0", NULL))) { 6913667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't add IPv4 default route to %s: %s", interface, strerror(-ret)); 6923667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6933667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6943667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6953667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "::/0", NULL))) { 6963667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't add IPv6 default route to %s: %s", interface, strerror(-ret)); 6973667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6983667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6993667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 7003667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return 0; 7013667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti} 7023667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 703a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti// Add a new rule to look up the 'main' table, with the same selectors as the "default network" 704db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule, but with a lower priority. We will never create routes in the main table; it should only be 705db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// used for directly-connected routes implicitly created by the kernel when adding IP addresses. 706db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// This is necessary, for example, when adding a route through a directly-connected gateway: in 707db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// order to add the route, there must already be a directly-connected route that covers the gateway. 708a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo ColittiWARN_UNUSED_RESULT int addDirectlyConnectedRule() { 709a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark fwmark; 710a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark mask; 711a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 712a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.netId = NETID_UNSET; 713a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti mask.netId = FWMARK_NET_ID_MASK; 714a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 715a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN, 716a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, UID_ROOT, UID_ROOT); 717a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti} 718a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 719db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that 720db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended 721db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable 722db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule will hopefully make things even clearer. 723fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addUnreachableRule() { 724fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET, 725fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran MARK_UNSET); 72687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 72787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 72887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { 7296a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 7306a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 7316a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 73257947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti return modifyOutputInterfaceRules(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 73357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti INVALID_UID, INVALID_UID, add); 7346a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 7356a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 7365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface, 7375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 7384043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7404043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return -ESRCH; 7414043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 7424043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 7445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 7475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 75057947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyOutputInterfaceRules(interface, table, permission, INVALID_UID, INVALID_UID, 7515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyImplicitNetworkRule(netId, table, permission, add); 7555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 7564043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface, 75895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran const UidRanges& uidRanges, bool secure, bool add, 7595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran bool modifyNonUidBasedRules) { 7605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 7635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 764b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 765e09b20aee85f1dfd8c18c3d8581ac875d939ba70Sreeram Ramachandran for (const UidRanges::Range& range : uidRanges.getRanges()) { 76695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, secure, add)) { 767fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 768fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 7695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first, 7705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 771b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 772b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 77357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, range.first, 77457947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti range.second, add)) { 775b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 776b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 778eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 7795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (modifyNonUidBasedRules) { 7805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 781b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 782b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 783111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran if (int ret = modifyVpnOutputToLocalRule(interface, add)) { 784111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return ret; 785111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran } 78695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) { 787b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 788b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 789fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add); 790b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7914043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 792b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 7934043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 7944043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface, 7965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 7979c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 79996f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return -ESRCH; 8009c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 8019c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 802122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 803122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 804f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 8055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 806122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 807f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 808f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 809122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 8109c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 8115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 81287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran mask.intValue); 8137619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 8147619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 815fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyTetheredNetwork(uint16_t action, const char* inputInterface, 816fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran const char* outputInterface) { 817fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran uint32_t table = getRouteTableForInterface(outputInterface); 818fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 819fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return -ESRCH; 820fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 821fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 822fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, 823fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 824fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 825fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 826b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 827b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram RamachandranWARN_UNUSED_RESULT int flushRules() { 828b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 829b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran const char* argv[] = { 830b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_PATH, 831b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_VERSIONS[i], 832b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "rule", 833b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "flush", 834b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran }; 835b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { 836b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran ALOGE("failed to flush rules"); 837b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return -EREMOTEIO; 838b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 839b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 840b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return 0; 841b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran} 842b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran 843f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected 844f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// route, to the main table as well. 845f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// Returns 0 on success or negative errno on failure. 846eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram RamachandranWARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination, 847eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, RouteController::TableType tableType) { 8485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table; 84938b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran switch (tableType) { 85038b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran case RouteController::INTERFACE: { 85138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran table = getRouteTableForInterface(interface); 8525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 8535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 8545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 85538b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 85638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 85787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran case RouteController::LOCAL_NETWORK: { 85887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran table = ROUTE_TABLE_LOCAL_NETWORK; 85987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran break; 86087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 8615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_NETWORK: { 8624acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_NETWORK; 86338b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 86438b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_SYSTEM: { 8664acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_SYSTEM; 86738b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 86838b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 86938b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8709c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 871f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti int ret = modifyIpRoute(action, table, interface, destination, nexthop); 8720321315d4e94dacd5ef2e0de217059cbc72d803dSreeram Ramachandran // Trying to add a route that already exists shouldn't cause an error. 8730321315d4e94dacd5ef2e0de217059cbc72d803dSreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { 874f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 875c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 876c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 877f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return 0; 8789c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 8799c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 880f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 881f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int flushRoutes(const char* interface) { 88292b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 8835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 884f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ESRCH; 88592b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 88692b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 887357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti char tableString[UINT32_STRLEN]; 888357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti snprintf(tableString, sizeof(tableString), "%u", table); 889357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 89099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int ret = 0; 891f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 892357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti const char* argv[] = { 893357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti IP_PATH, 894f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran IP_VERSIONS[i], 89572999d6cfc1df23cd911b85730f1f532fb62bed4Sreeram Ramachandran "route", 896357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "flush", 897357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "table", 898357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti tableString, 899357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti }; 90099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 90199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // A flush works by dumping routes and deleting each route as it's returned, and it can 90299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // fail if something else deletes the route between the dump and the delete. This can 90399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // happen, for example, if an interface goes down while we're trying to flush its routes. 90499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // So try multiple times and only return an error if the last attempt fails. 90599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // 90699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // TODO: replace this with our own netlink code. 90799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti unsigned attempts = 0; 90899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int err; 90999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti do { 91099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti err = android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), 91199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti NULL, false, false); 91299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ++attempts; 91399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } while (err != 0 && attempts < ROUTE_FLUSH_ATTEMPTS); 91499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (err) { 91599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ALOGE("failed to flush %s routes in table %s after %d attempts", 91699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti IP_VERSIONS[i], tableString, attempts); 91799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ret = -EREMOTEIO; 918357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 919357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 920357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 92199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // If we failed to flush routes, the caller may elect to keep this interface around, so keep 92299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // track of its name. 92399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (!ret) { 92499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti interfaceToTable.erase(interface); 92599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } 92699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 92799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti return ret; 92892b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 92992b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 9306b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo ColittiWARN_UNUSED_RESULT int clearTetheringRules(const char* inputInterface) { 9316b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti int ret = 0; 9326b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti while (ret == 0) { 9336b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti ret = modifyIpRule(RTM_DELRULE, RULE_PRIORITY_TETHERING, 0, MARK_UNSET, MARK_UNSET, 9346b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 9356b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 9366b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti 9376b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (ret == -ENOENT) { 9386b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return 0; 9396b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } else { 9406b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return ret; 9416b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 9426b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti} 9436b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti 9445c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} // namespace 9455c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 94687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::Init(unsigned localNetId) { 947b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (int ret = flushRules()) { 948b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 949b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 95087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = addLegacyRouteRules()) { 951f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 952f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 953fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addLocalNetworkRules(localNetId)) { 954b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 955f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 956a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti if (int ret = addDirectlyConnectedRule()) { 957a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return ret; 958a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti } 959fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addUnreachableRule()) { 96087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 96187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 9623667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // Don't complain if we can't add the dummy network, since not all devices support it. 9633667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti configureDummyNetwork(); 9643667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 9654acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 966f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 9678fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 9688fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 9696a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { 97087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_ADD); 9716a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9726a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9736a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { 97487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_DEL); 9756a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9766a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 9785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9794acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { 9804acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9814acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9824acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9834acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9845c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 9855c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 9865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 9875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 989f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 990f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 9914acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 9924acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9934acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9946b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (int ret = clearTetheringRules(interface)) { 9956b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return ret; 9966b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 9974acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9984acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 999379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 1000379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 10015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 100295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 100395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 10044acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 10054acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 10064acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 10074acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 10084acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 10094043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 10104043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 10115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 101295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 101395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 10145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 10154043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return ret; 10164043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 10174acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 10184acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 10194acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 10204acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 10214acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 10224043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 10234043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 10245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 10255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission oldPermission, 10265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission newPermission) { 1027379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 10285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 1029f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 1030f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 10315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 1032b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1033b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 103495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranint RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure, 10355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 103695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 10375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 1038b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1039b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 10405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 104195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 104295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 10435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 10449c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10459c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 10475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 10489c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10499c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 10515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 10525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 10535c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 10547619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1055f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 1056eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran TableType tableType) { 1057eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 10587619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 10597619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1060f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colittiint RouteController::removeRoute(const char* interface, const char* destination, 1061eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, TableType tableType) { 1062eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 10637619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 106487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 106587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { 1066fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface); 106787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 106887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 106987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { 1070fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface); 107187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 107248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 107348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface, 107448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 107548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission); 107648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 107748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 107848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId, 107948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 108048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 108148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission); 108248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 1083