RouteController.cpp revision dc0d578a69cc5a57167a508207e2198590142d51
15c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran/* 25c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Copyright (C) 2014 The Android Open Source Project 35c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 45c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Licensed under the Apache License, Version 2.0 (the "License"); 55c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * you may not use this file except in compliance with the License. 65c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * You may obtain a copy of the License at 75c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 85c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * http://www.apache.org/licenses/LICENSE-2.0 95c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 105c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Unless required by applicable law or agreed to in writing, software 115c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * distributed under the License is distributed on an "AS IS" BASIS, 125c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 135c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * See the License for the specific language governing permissions and 145c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * limitations under the License. 155c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran */ 165c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 175c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "RouteController.h" 185c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 19aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <arpa/inet.h> 20aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <errno.h> 21aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <fcntl.h> 22aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <linux/fib_rules.h> 23aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <net/if.h> 24aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <sys/stat.h> 25aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert 26bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes#include <private/android_filesystem_config.h> 27bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes 28aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert#include <map> 29aa1be2b3d24d99f3ccb98ff4fbb2a81b63587effDan Albert 305c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "Fwmark.h" 31b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran#include "UidRanges.h" 323667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti#include "DummyNetwork.h" 33f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 34bbd5626b3d0994ff0ecbfceac75f6dc4abfb55c6Elliott Hughes#include "android-base/file.h" 35f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#define LOG_TAG "Netd" 36f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "log/log.h" 37f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "logwrap/logwrap.h" 383667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti#include "netutils/ifc.h" 395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran#include "resolv_netid.h" 405c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 415407e14fd3d81bb76f94221b4a359faa2806de65Dan Albertusing android::base::WriteStringToFile; 42dc0d578a69cc5a57167a508207e2198590142d51Robin Leeusing android::net::UidRange; 435407e14fd3d81bb76f94221b4a359faa2806de65Dan Albert 445c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandrannamespace { 455c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 46f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// BEGIN CONSTANTS -------------------------------------------------------------------------------- 47f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000; 4957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitticonst uint32_t RULE_PRIORITY_VPN_OVERRIDE_OIF = 10500; 50111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL = 11000; 515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_SECURE_VPN = 12000; 526c84ef62d953eae93c36ffa831e9b451560afba0Robin Leeconst uint32_t RULE_PRIORITY_PROHIBIT_NON_VPN = 12500; 535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; 545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; 555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; 565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; 576a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranconst uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; 5887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t RULE_PRIORITY_TETHERING = 18000; 595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000; 6095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranconst uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000; 6148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000; 625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; 63a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitticonst uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000; 64db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitticonst uint32_t RULE_PRIORITY_UNREACHABLE = 32000; 655c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 6687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97; 674acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98; 684acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99; 694acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 7087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network"; 714acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network"; 724acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system"; 734acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 74bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL = "local"; 75bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_MAIN = "main"; 76bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 775965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not 785965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make 795965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert 805965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// that will warn us if upstream has given these values some other meaning. 815965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_START = 18; 825965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_END = 19; 835965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colittistatic_assert(FRA_UID_START > FRA_MAX, 845965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. " 855965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Check that these values match what the kernel does and then update this assertion."); 865965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 8772723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK; 8872723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL; 894753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 90f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0}; 91f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 92f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; 93f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 94f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst char* const IP_VERSIONS[] = {"-4", "-6"}; 95f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uid_t UID_ROOT = 0; 975ad4e98f7b566ffde39491ee4e80d4a15507f053Lorenzo Colitticonst char* const IIF_LOOPBACK = "lo"; 9887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const IIF_NONE = NULL; 995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst char* const OIF_NONE = NULL; 1005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_ADD = true; 1015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_DEL = false; 1025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool MODIFY_NON_UID_BASED_RULES = true; 1035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 1044acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 105c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r-- 1064acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 10799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitticonst unsigned ROUTE_FLUSH_ATTEMPTS = 2; 10899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 109f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" 110f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). 111f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconstexpr uint16_t U16_RTA_LENGTH(uint16_t x) { 112f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return RTA_LENGTH(x); 113f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran} 114f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 115f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// These are practically const, but can't be declared so, because they are used to initialize 116f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// non-const pointers ("void* iov_base") in iovec arrays. 117f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; 118f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; 119f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; 120f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; 121f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START }; 122f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END }; 123f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 124f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; 125f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; 126f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 127f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranuint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; 128f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 129f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// END CONSTANTS ---------------------------------------------------------------------------------- 130f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 1314acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// No locks needed because RouteController is accessed only from one thread (in CommandListener). 1324acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranstd::map<std::string, uint32_t> interfaceToTable; 133a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen 1345c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranuint32_t getRouteTableForInterface(const char* interface) { 135a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran uint32_t index = if_nametoindex(interface); 136a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen if (index) { 1374acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; 1384acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran interfaceToTable[interface] = index; 1394acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return index; 1404acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1414acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // If the interface goes away if_nametoindex() will return 0 but we still need to know 1424acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // the index so we can remove the rules and routes. 1434acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran auto iter = interfaceToTable.find(interface); 1444acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (iter == interfaceToTable.end()) { 1454acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 1464acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return RT_TABLE_UNSPEC; 1474acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1484acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return iter->second; 1494acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1504acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1514acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid addTableName(uint32_t table, const std::string& name, std::string* contents) { 1524acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran char tableString[UINT32_STRLEN]; 1534acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran snprintf(tableString, sizeof(tableString), "%u", table); 1544acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += tableString; 1554acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += " "; 1564acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += name; 1574acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += "\n"; 1584acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// Doesn't return success/failure as the file is optional; it's okay if we fail to update it. 1614acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid updateTableNamesFile() { 1624acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran std::string contents; 163bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 164bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents); 165bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents); 166bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 16787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents); 1684acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); 1694acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); 170bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 1714acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran for (const auto& entry : interfaceToTable) { 1724acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(entry.second, entry.first, &contents); 1734acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1744acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1755407e14fd3d81bb76f94221b4a359faa2806de65Dan Albert if (!WriteStringToFile(contents, RT_TABLES_PATH, RT_TABLES_MODE, AID_SYSTEM, AID_WIFI)) { 176bd37832f1843ed78f64604e5627cf952ac9614baElliott Hughes ALOGE("failed to write to %s (%s)", RT_TABLES_PATH, strerror(errno)); 1774acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return; 178a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen } 1795c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 1805c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1814753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Sends a netlink request and expects an ack. 1824753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// |iov| is an array of struct iovec that contains the netlink message payload. 1834753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// The netlink header is generated by this function based on |action| and |flags|. 1844753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Returns -errno if there was an error or if the kernel reported an error. 185f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov 186f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov// Disable optimizations in ASan build. 187f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov// ASan reports an out-of-bounds 32-bit(!) access in the first loop of the 188f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov// function (over iov[]). 189f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov#ifdef __clang__ 190f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov#if __has_feature(address_sanitizer) 191f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov__attribute__((optnone)) 192f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov#endif 193f65122c81c824940ba93666d961c8d3fd76f3a9cEvgenii Stepanov#endif 194f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) { 1954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr nlmsg = { 1964753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_type = action, 1974753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_flags = flags, 1984753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 1994753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_base = &nlmsg; 2004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_len = sizeof(nlmsg); 2014753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti for (int i = 0; i < iovlen; ++i) { 2024753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsg.nlmsg_len += iov[i].iov_len; 2034753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2044753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2054753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int ret; 2064753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti struct { 2074753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr msg; 2084753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsgerr err; 2094753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } response; 2104753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 21153ea9cadf6cc5f8be1c16b5b6b660cd7366fd3f0Nick Kralevich int sock = socket(AF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_ROUTE); 2124753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1 && 213f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS), 214f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran sizeof(NETLINK_ADDRESS)) != -1 && 2154753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti writev(sock, iov, iovlen) != -1 && 2164753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti (ret = recv(sock, &response, sizeof(response), 0)) != -1) { 2174753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (ret == sizeof(response)) { 2184753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = response.err.error; // Netlink errors are negative errno. 219f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret) { 220f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink response contains error (%s)", strerror(-ret)); 221f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 2224753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 2231201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response)); 2244753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -EBADMSG; 2254753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2264753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 227f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno)); 2284753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -errno; 2294753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2304753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2314753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1) { 2324753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti close(sock); 2334753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2344753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2354753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return ret; 2364753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti} 2374753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 23887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 23987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { 24087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (!input) { 24187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = 0; 24287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = 0; 24387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 24487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 24587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = strlcpy(name, input, IFNAMSIZ) + 1; 24687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (*length > IFNAMSIZ) { 24787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); 24887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return -ENAMETOOLONG; 24987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 25087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); 25187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 25287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 25387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 2548fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 2558fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 2566b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the table is 2574ef94642636182e68495f606a65c00f8a830aad4Robin Lee// unspecified. An unspecified table is not allowed when creating an FR_ACT_TO_TBL rule. 2588fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 2598fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 26087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |iif| is non-NULL, the rule matches the specified incoming interface. 26187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |oif| is non-NULL, the rule matches the specified outgoing interface. 26287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that 26387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// range (inclusive). Otherwise, the rule matches packets from all UIDs. 26496f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// 26596f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// Returns 0 on success or negative errno on failure. 2664ef94642636182e68495f606a65c00f8a830aad4Robin LeeWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint8_t ruleType, 2674ef94642636182e68495f606a65c00f8a830aad4Robin Lee uint32_t table, uint32_t fwmark, uint32_t mask, const char* iif, 26887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran const char* oif, uid_t uidStart, uid_t uidEnd) { 269f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 270f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (fwmark & ~mask) { 271f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 272f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ERANGE; 273f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 274f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 27587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran // Interface names must include exactly one terminating NULL and be properly padded, or older 2764753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // kernels will refuse to delete rules. 27787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; 27887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran size_t iifLength, oifLength; 27987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint16_t iifPadding, oifPadding; 28087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { 28187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 28287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 28387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { 28487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 2854753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2867619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2875965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti // Either both start and end UID must be specified, or neither. 288f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 289cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 2905965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti return -EUSERS; 2915965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti } 2924ef94642636182e68495f606a65c00f8a830aad4Robin Lee 29372723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti bool isUidRule = (uidStart != INVALID_UID); 2945965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 2954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rule request and put it in an array of iovec structures. 2964753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti fib_rule_hdr rule = { 2974ef94642636182e68495f606a65c00f8a830aad4Robin Lee .action = ruleType, 2986b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // Note that here we're implicitly setting rule.table to 0. When we want to specify a 2996b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // non-zero table, we do this via the FRATTR_TABLE attribute. 3004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 301a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 3026b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // Don't ever create a rule that looks up table 0, because table 0 is the local table. 3036b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // It's OK to specify a table ID of 0 when deleting a rule, because that doesn't actually select 3046b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti // table 0, it's a wildcard that matches anything. 3056b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (table == RT_TABLE_UNSPEC && rule.action == FR_ACT_TO_TBL && action != RTM_DELRULE) { 3066b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti ALOGE("RT_TABLE_UNSPEC only allowed when deleting rules"); 3076b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return -ENOTUNIQ; 3086b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 3096b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti 31087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; 31187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; 312a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 3134753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iovec iov[] = { 314f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 315f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rule, sizeof(rule) }, 316f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 317f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &priority, sizeof(priority) }, 3185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 3195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 320f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 321f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &fwmark, mask ? sizeof(fwmark) : 0 }, 322f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 323f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &mask, mask ? sizeof(mask) : 0 }, 324f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 }, 325f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidStart, isUidRule ? sizeof(uidStart) : 0 }, 326f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 }, 327f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 }, 32887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, 32987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { iifName, iifLength }, 33087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, iifPadding }, 33187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, 33287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { oifName, oifLength }, 33387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, oifPadding }, 3344753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 3354753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 33672723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; 337f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 338f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rule.family = AF_FAMILIES[i]; 339f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) { 34096f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return ret; 3415c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3425c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3435c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 34496f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return 0; 3455c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 3465c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 34787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 3484ef94642636182e68495f606a65c00f8a830aad4Robin Lee uint32_t fwmark, uint32_t mask, const char* iif, 3494ef94642636182e68495f606a65c00f8a830aad4Robin Lee const char* oif, uid_t uidStart, uid_t uidEnd) { 3504ef94642636182e68495f606a65c00f8a830aad4Robin Lee return modifyIpRule(action, priority, FR_ACT_TO_TBL, table, fwmark, mask, iif, oif, uidStart, 3514ef94642636182e68495f606a65c00f8a830aad4Robin Lee uidEnd); 3524ef94642636182e68495f606a65c00f8a830aad4Robin Lee} 3534ef94642636182e68495f606a65c00f8a830aad4Robin Lee 3544ef94642636182e68495f606a65c00f8a830aad4Robin LeeWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 35587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask) { 35687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, 35787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID); 35887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 35987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 360ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Adds or deletes an IPv4 or IPv6 route. 361ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Returns 0 on success or negative errno on failure. 362f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 363f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran const char* destination, const char* nexthop) { 364ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // At least the destination must be non-null. 365ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!destination) { 366f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("null destination"); 367ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EFAULT; 368ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 369ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 370ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // Parse the prefix. 371ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawAddress[sizeof(in6_addr)]; 372f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t family; 373f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t prefixLength; 374ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 375ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti &prefixLength); 376ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (rawLength < 0) { 377f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 378ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return rawLength; 379ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 3807619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 381ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 3821201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 383ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 384ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 385ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 386de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t type = RTN_UNICAST; 387ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint32_t ifindex; 388de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t rawNexthop[sizeof(in6_addr)]; 389de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran 390de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && !strcmp(nexthop, "unreachable")) { 391de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran type = RTN_UNREACHABLE; 392de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup 393de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for 394de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.) 395de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran interface = OIF_NONE; 396de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran nexthop = NULL; 3974c95a125e0930c112555437589f7620575482095Lorenzo Colitti } else if (nexthop && !strcmp(nexthop, "throw")) { 3984c95a125e0930c112555437589f7620575482095Lorenzo Colitti type = RTN_THROW; 3994c95a125e0930c112555437589f7620575482095Lorenzo Colitti interface = OIF_NONE; 4004c95a125e0930c112555437589f7620575482095Lorenzo Colitti nexthop = NULL; 401de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } else { 402de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If an interface was specified, find the ifindex. 403de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (interface != OIF_NONE) { 404de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ifindex = if_nametoindex(interface); 405de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (!ifindex) { 406de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 407de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -ENODEV; 408de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 4097619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 4107619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 411de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If a nexthop was specified, parse it as the same family as the prefix. 412de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 413de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("inet_pton failed for nexthop %s", nexthop); 414de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -EINVAL; 415de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 416ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 417ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 4184753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rtmsg and put it in an array of iovec structures. 419f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtmsg route = { 420ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_protocol = RTPROT_STATIC, 421de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran .rtm_type = type, 422ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_family = family, 423ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_dst_len = prefixLength, 4242bff72e0cf091f4d71af0c81cfc74e8ebd8c6644Sreeram Ramachandran .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK), 425ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 4264753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 427f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 428f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 429ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 430ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti iovec iov[] = { 431f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 432f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &route, sizeof(route) }, 433f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 434f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &table, sizeof(table) }, 435f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaDst, sizeof(rtaDst) }, 436f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawAddress, static_cast<size_t>(rawLength) }, 4375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 4385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 439f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 440f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 441ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 442ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 443f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : 444f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran NETLINK_REQUEST_FLAGS; 4454753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov)); 4467619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 4477619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 4485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// An iptables rule to mark incoming packets on a network with the netId of the network. 4495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is so that the kernel can: 4515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 4525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// replies, SYN-ACKs, etc). 4535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Mark sockets that accept connections from this interface so that the connection stays on the 4545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// same interface. 4555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 4565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 4605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = true; 4625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 464b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran char markString[UINT32_HEX_STRLEN]; 4655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue); 4665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 467b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j", 468b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran "MARK", "--set-mark", markString, NULL)) { 469b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran ALOGE("failed to change iptables rule that sets incoming packet mark"); 470b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return -EREMOTEIO; 471b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 4725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 473b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 474b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 475b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 476111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// A rule to route responses to the local network forwarded via the VPN. 477111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// 478111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// When a VPN is in effect, packets from the local network to upstream networks are forwarded into 479111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel. 480111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) { 481111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL, 482111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE, 483111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran INVALID_UID, INVALID_UID); 484111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran} 485111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran 486fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to route all traffic from a given set of UIDs to go over the VPN. 487fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 488fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 489fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 490fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// bypass the VPN if the protectedFromVpn bit is set. 491fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 49295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, bool add) { 493fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 494fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 495fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 496fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.protectedFromVpn = false; 497fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.protectedFromVpn = true; 498fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 49995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority; 50095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 50195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (secure) { 50295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_SECURE_VPN; 50395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } else { 50495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_BYPASSABLE_VPN; 50595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 50695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran fwmark.explicitlySelected = false; 50795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.explicitlySelected = true; 50895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } 50995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 51095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 5115ad4e98f7b566ffde39491ee4e80d4a15507f053Lorenzo Colitti mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd); 512fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 513fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 514fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 515fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// set of UIDs. 516fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 517fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 518fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// target set, but where the DnsProxyListener itself is not. 51995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure, 52095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool add) { 521fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 522fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 523fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 524fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.netId = netId; 525fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 526fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 527fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 528fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 529fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 53095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN; 53195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 53295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 53395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue); 534fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 535fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 5365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on an explicitly chosen network. 5375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 5395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 5415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// to check it again in the rules here, because a network's permissions may have been updated via 5425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// modifyNetworkPermission(). 5435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 5445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 546eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark fwmark; 547eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark mask; 548eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 549eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran fwmark.netId = netId; 550eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 551eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 5535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 554eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 5575c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 55987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); 5605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5615c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on a chosen outgoing interface. 5635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 5655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// the outgoing interface (typically for link-local communications). 56657947f02c00bb03651e3f9427c880211c689db7fLorenzo ColittiWARN_UNUSED_RESULT int modifyOutputInterfaceRules(const char* interface, uint32_t table, 56757947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti Permission permission, uid_t uidStart, 56857947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti uid_t uidEnd, bool add) { 569122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 570122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 5715c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 572f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 573f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran mask.permission = permission; 5745c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 57557947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti // If this rule does not specify a UID range, then also add a corresponding high-priority rule 57657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti // for UID. This covers forwarded packets and system daemons such as the tethering DHCP server. 57757947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (uidStart == INVALID_UID && uidEnd == INVALID_UID) { 57857947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OVERRIDE_OIF, 57957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti table, fwmark.intValue, mask.intValue, IIF_NONE, interface, 58057947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti UID_ROOT, UID_ROOT)) { 58157947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti return ret; 58257947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti } 58357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti } 58457947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti 5855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 58687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd); 5875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on the chosen network. 5905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is for sockets that have not explicitly requested a particular network, but have been 5925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bound to one when they called connect(). This ensures that sockets connected on a particular 5935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// network stay on that network even if the default network changes. 5945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, 5955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 5965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 599122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 600122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 601122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 6025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 603122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 6045c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 6055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 6065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 607eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 6085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 60987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 6105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6115c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 61248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// A rule to enable split tunnel VPNs. 61348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// 61448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to 61548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// go over the default network, provided it wasn't explicitly restricted to the VPN and has the 61648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// permissions required by the default network. 61748e19b037e7e20674048ef76bf31ce65c741347cSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId, 61848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 61948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 62048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran uint32_t table = getRouteTableForInterface(physicalInterface); 62148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 62248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return -ESRCH; 62348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran } 62448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 62548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark fwmark; 62648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark mask; 62748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 62848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.netId = vpnNetId; 62948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 63048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 63148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.explicitlySelected = false; 63248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.explicitlySelected = true; 63348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 63448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.permission = permission; 63548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.permission = permission; 63648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 63748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue, 63848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.intValue); 63948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 64048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 641fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to allow legacy routes added through the requestRouteToHost() API. 642fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLegacyRouteRules() { 6435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 646fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 647fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 649fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // Rules to allow legacy routes to override the default network. 650fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 651fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue)) { 652fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 653fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 654fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 655fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { 656fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 657fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 658fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 659fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 660fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 661fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 662fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // A rule to allow legacy routes from system apps to override VPNs. 663fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 664fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue); 6655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 667fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to lookup the local network when specified explicitly or otherwise. 668fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) { 669fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 670fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran INVALID_UID, INVALID_UID, ACTION_ADD)) { 671fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 672fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 673fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 6745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 677fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 678fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 680fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, 68187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 6825c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 6835c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 6843667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colittiint configureDummyNetwork() { 6853667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti const char *interface = DummyNetwork::INTERFACE_NAME; 6863667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti uint32_t table = getRouteTableForInterface(interface); 6873667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (table == RT_TABLE_UNSPEC) { 6883667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // getRouteTableForInterface has already looged an error. 6893667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -ESRCH; 6903667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6913667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6923667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_init(); 6933667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti int ret = ifc_up(interface); 6943667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_close(); 6953667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (ret) { 6963667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't bring up %s: %s", interface, strerror(errno)); 6973667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -errno; 6983667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6993667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 70057947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if ((ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, 70157947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti INVALID_UID, INVALID_UID, ACTION_ADD))) { 70257947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti ALOGE("Can't create oif rules for %s: %s", interface, strerror(-ret)); 7033667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 7043667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 7053667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 7063667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "0.0.0.0/0", NULL))) { 7073667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't add IPv4 default route to %s: %s", interface, strerror(-ret)); 7083667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 7093667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 7103667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 7113667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "::/0", NULL))) { 7123667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't add IPv6 default route to %s: %s", interface, strerror(-ret)); 7133667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 7143667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 7153667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 7163667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return 0; 7173667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti} 7183667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 719a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti// Add a new rule to look up the 'main' table, with the same selectors as the "default network" 720db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule, but with a lower priority. We will never create routes in the main table; it should only be 721db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// used for directly-connected routes implicitly created by the kernel when adding IP addresses. 722db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// This is necessary, for example, when adding a route through a directly-connected gateway: in 723db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// order to add the route, there must already be a directly-connected route that covers the gateway. 724a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo ColittiWARN_UNUSED_RESULT int addDirectlyConnectedRule() { 725a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark fwmark; 726a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark mask; 727a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 728a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.netId = NETID_UNSET; 729a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti mask.netId = FWMARK_NET_ID_MASK; 730a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 731a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN, 732a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, UID_ROOT, UID_ROOT); 733a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti} 734a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 735db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that 736db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended 737db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable 738db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule will hopefully make things even clearer. 739fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addUnreachableRule() { 740c125fe43c194128167db7a2a82b736b1357945d8Robin Lee return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, FR_ACT_UNREACHABLE, RT_TABLE_UNSPEC, 741c125fe43c194128167db7a2a82b736b1357945d8Robin Lee MARK_UNSET, MARK_UNSET, IIF_NONE, OIF_NONE, INVALID_UID, INVALID_UID); 74287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 74387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 74487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { 7456a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 7466a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 7476a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 74857947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti return modifyOutputInterfaceRules(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 74957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti INVALID_UID, INVALID_UID, add); 7506a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 7516a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 7525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface, 7535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 7544043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7564043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return -ESRCH; 7574043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 7584043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 7605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 7635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 76657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyOutputInterfaceRules(interface, table, permission, INVALID_UID, INVALID_UID, 7675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyImplicitNetworkRule(netId, table, permission, add); 7715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 7724043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 773b8087363143050d214d48e5620a330776ca95a69Robin LeeWARN_UNUSED_RESULT int modifyRejectNonSecureNetworkRule(const UidRanges& uidRanges, bool add) { 774b8087363143050d214d48e5620a330776ca95a69Robin Lee Fwmark fwmark; 775b8087363143050d214d48e5620a330776ca95a69Robin Lee Fwmark mask; 776b8087363143050d214d48e5620a330776ca95a69Robin Lee fwmark.protectedFromVpn = false; 777b8087363143050d214d48e5620a330776ca95a69Robin Lee mask.protectedFromVpn = true; 778b8087363143050d214d48e5620a330776ca95a69Robin Lee 779dc0d578a69cc5a57167a508207e2198590142d51Robin Lee for (const UidRange& range : uidRanges.getRanges()) { 780b8087363143050d214d48e5620a330776ca95a69Robin Lee if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, 781b8087363143050d214d48e5620a330776ca95a69Robin Lee RULE_PRIORITY_PROHIBIT_NON_VPN, FR_ACT_PROHIBIT, RT_TABLE_UNSPEC, 782b8087363143050d214d48e5620a330776ca95a69Robin Lee fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, 783dc0d578a69cc5a57167a508207e2198590142d51Robin Lee range.getStart(), range.getStop())) { 784b8087363143050d214d48e5620a330776ca95a69Robin Lee return ret; 785b8087363143050d214d48e5620a330776ca95a69Robin Lee } 786b8087363143050d214d48e5620a330776ca95a69Robin Lee } 787b8087363143050d214d48e5620a330776ca95a69Robin Lee 788b8087363143050d214d48e5620a330776ca95a69Robin Lee return 0; 789b8087363143050d214d48e5620a330776ca95a69Robin Lee} 790b8087363143050d214d48e5620a330776ca95a69Robin Lee 7915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface, 79295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran const UidRanges& uidRanges, bool secure, bool add, 7935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran bool modifyNonUidBasedRules) { 7945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 7975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 798b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 799dc0d578a69cc5a57167a508207e2198590142d51Robin Lee for (const UidRange& range : uidRanges.getRanges()) { 800dc0d578a69cc5a57167a508207e2198590142d51Robin Lee if (int ret = modifyVpnUidRangeRule(table, range.getStart(), range.getStop(), secure, add)) 801dc0d578a69cc5a57167a508207e2198590142d51Robin Lee { 802fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 803fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 804dc0d578a69cc5a57167a508207e2198590142d51Robin Lee if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.getStart(), 805dc0d578a69cc5a57167a508207e2198590142d51Robin Lee range.getStop(), add)) { 806b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 807b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 808dc0d578a69cc5a57167a508207e2198590142d51Robin Lee if (int ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, 809dc0d578a69cc5a57167a508207e2198590142d51Robin Lee range.getStart(), range.getStop(), add)) { 810b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 811b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 8125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 813eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 8145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (modifyNonUidBasedRules) { 8155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 816b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 817b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 818111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran if (int ret = modifyVpnOutputToLocalRule(interface, add)) { 819111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return ret; 820111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran } 82195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) { 822b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 823b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 824fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add); 825b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 8264043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 827b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 8284043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 8294043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 8305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface, 8315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 8329c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 8335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 83496f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return -ESRCH; 8359c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 8369c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 837122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 838122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 839f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 8405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 841122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 842f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 843f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 844122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 8459c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 8465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 84787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran mask.intValue); 8487619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 8497619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 850fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyTetheredNetwork(uint16_t action, const char* inputInterface, 851fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran const char* outputInterface) { 852fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran uint32_t table = getRouteTableForInterface(outputInterface); 853fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 854fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return -ESRCH; 855fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 856fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 857fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, 858fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 859fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 860fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 861b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 862b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram RamachandranWARN_UNUSED_RESULT int flushRules() { 863b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 864b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran const char* argv[] = { 865b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_PATH, 866b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_VERSIONS[i], 867b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "rule", 868b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "flush", 869b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran }; 870b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { 871b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran ALOGE("failed to flush rules"); 872b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return -EREMOTEIO; 873b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 874b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 875b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return 0; 876b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran} 877b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran 878f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected 879f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// route, to the main table as well. 880f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// Returns 0 on success or negative errno on failure. 881eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram RamachandranWARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination, 882eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, RouteController::TableType tableType) { 8835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table; 88438b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran switch (tableType) { 88538b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran case RouteController::INTERFACE: { 88638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran table = getRouteTableForInterface(interface); 8875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 8885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 8895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 89038b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 89138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 89287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran case RouteController::LOCAL_NETWORK: { 89387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran table = ROUTE_TABLE_LOCAL_NETWORK; 89487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran break; 89587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 8965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_NETWORK: { 8974acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_NETWORK; 89838b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 89938b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 9005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_SYSTEM: { 9014acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_SYSTEM; 90238b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 90338b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 90438b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 9059c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 906f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti int ret = modifyIpRoute(action, table, interface, destination, nexthop); 9070321315d4e94dacd5ef2e0de217059cbc72d803dSreeram Ramachandran // Trying to add a route that already exists shouldn't cause an error. 9080321315d4e94dacd5ef2e0de217059cbc72d803dSreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { 909f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 910c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 911c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 912f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return 0; 9139c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 9149c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 915f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 916f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int flushRoutes(const char* interface) { 91792b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 9185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 919f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ESRCH; 92092b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 92192b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 922357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti char tableString[UINT32_STRLEN]; 923357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti snprintf(tableString, sizeof(tableString), "%u", table); 924357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 92599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int ret = 0; 926f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 927357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti const char* argv[] = { 928357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti IP_PATH, 929f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran IP_VERSIONS[i], 93072999d6cfc1df23cd911b85730f1f532fb62bed4Sreeram Ramachandran "route", 931357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "flush", 932357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "table", 933357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti tableString, 934357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti }; 93599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 93699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // A flush works by dumping routes and deleting each route as it's returned, and it can 93799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // fail if something else deletes the route between the dump and the delete. This can 93899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // happen, for example, if an interface goes down while we're trying to flush its routes. 93999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // So try multiple times and only return an error if the last attempt fails. 94099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // 94199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // TODO: replace this with our own netlink code. 94299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti unsigned attempts = 0; 94399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int err; 94499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti do { 94599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti err = android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), 94699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti NULL, false, false); 94799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ++attempts; 94899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } while (err != 0 && attempts < ROUTE_FLUSH_ATTEMPTS); 94999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (err) { 95099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ALOGE("failed to flush %s routes in table %s after %d attempts", 95199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti IP_VERSIONS[i], tableString, attempts); 95299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ret = -EREMOTEIO; 953357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 954357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 955357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 95699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // If we failed to flush routes, the caller may elect to keep this interface around, so keep 95799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // track of its name. 95899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (!ret) { 95999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti interfaceToTable.erase(interface); 96099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } 96199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 96299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti return ret; 96392b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 96492b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 9656b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo ColittiWARN_UNUSED_RESULT int clearTetheringRules(const char* inputInterface) { 9666b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti int ret = 0; 9676b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti while (ret == 0) { 9686b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti ret = modifyIpRule(RTM_DELRULE, RULE_PRIORITY_TETHERING, 0, MARK_UNSET, MARK_UNSET, 9696b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 9706b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 9716b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti 9726b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (ret == -ENOENT) { 9736b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return 0; 9746b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } else { 9756b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return ret; 9766b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 9776b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti} 9786b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti 9795c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} // namespace 9805c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 98187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::Init(unsigned localNetId) { 982b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (int ret = flushRules()) { 983b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 984b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 98587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = addLegacyRouteRules()) { 986f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 987f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 988fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addLocalNetworkRules(localNetId)) { 989b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 990f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 991a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti if (int ret = addDirectlyConnectedRule()) { 992a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return ret; 993a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti } 994fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addUnreachableRule()) { 99587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 99687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 9973667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // Don't complain if we can't add the dummy network, since not all devices support it. 9983667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti configureDummyNetwork(); 9993667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 10004acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 1001f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 10028fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 10038fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 10046a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { 100587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_ADD); 10066a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 10076a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 10086a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { 100987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_DEL); 10106a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 10116a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 10125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 10135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 10144acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { 10154acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 10164acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 10174acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 10184acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 10195c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 10205c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 10215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 10225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 10235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 1024f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 1025f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 10264acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 10274acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 10284acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 10296b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti if (int ret = clearTetheringRules(interface)) { 10306b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti return ret; 10316b6f25fa4c135d477bcaf0bb50305a5d9aee92e3Lorenzo Colitti } 10324acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 10334acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 1034379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 1035379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 10365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 103795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 103895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 10394acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 10404acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 10414acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 10424acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 10434acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 10444043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 10454043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 10465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 104795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 104895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 10495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 10504043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return ret; 10514043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 10524acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 10534acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 10544acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 10554acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 10564acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 10574043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 10584043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 10595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 10605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission oldPermission, 10615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission newPermission) { 1062379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 10635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 1064f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 1065f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 10665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 1067b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1068b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 1069b8087363143050d214d48e5620a330776ca95a69Robin Leeint RouteController::addUsersToRejectNonSecureNetworkRule(const UidRanges& uidRanges) { 1070b8087363143050d214d48e5620a330776ca95a69Robin Lee return modifyRejectNonSecureNetworkRule(uidRanges, true); 1071b8087363143050d214d48e5620a330776ca95a69Robin Lee} 1072b8087363143050d214d48e5620a330776ca95a69Robin Lee 1073b8087363143050d214d48e5620a330776ca95a69Robin Leeint RouteController::removeUsersFromRejectNonSecureNetworkRule(const UidRanges& uidRanges) { 1074b8087363143050d214d48e5620a330776ca95a69Robin Lee return modifyRejectNonSecureNetworkRule(uidRanges, false); 1075b8087363143050d214d48e5620a330776ca95a69Robin Lee} 1076b8087363143050d214d48e5620a330776ca95a69Robin Lee 107795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranint RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure, 10785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 107995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 10805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 1081b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1082b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 10835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 108495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 108595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 10865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 10879c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10889c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 10905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 10919c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10929c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 10945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 10955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 10965c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 10977619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1098f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 1099eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran TableType tableType) { 1100eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 11017619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 11027619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1103f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colittiint RouteController::removeRoute(const char* interface, const char* destination, 1104eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, TableType tableType) { 1105eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 11067619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 110787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 110887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { 1109fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface); 111087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 111187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 111287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { 1113fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface); 111487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 111548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 111648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface, 111748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 111848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission); 111948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 112048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 112148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId, 112248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 112348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 112448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission); 112548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 1126