RouteController.cpp revision 57947f02c00bb03651e3f9427c880211c689db7f
15c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran/* 25c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Copyright (C) 2014 The Android Open Source Project 35c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 45c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Licensed under the Apache License, Version 2.0 (the "License"); 55c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * you may not use this file except in compliance with the License. 65c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * You may obtain a copy of the License at 75c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 85c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * http://www.apache.org/licenses/LICENSE-2.0 95c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * 105c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * Unless required by applicable law or agreed to in writing, software 115c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * distributed under the License is distributed on an "AS IS" BASIS, 125c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 135c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * See the License for the specific language governing permissions and 145c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran * limitations under the License. 155c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran */ 165c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 175c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "RouteController.h" 185c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 195c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include "Fwmark.h" 20b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran#include "UidRanges.h" 213667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti#include "DummyNetwork.h" 22f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 23f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#define LOG_TAG "Netd" 24f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "log/log.h" 25f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "logwrap/logwrap.h" 263667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti#include "netutils/ifc.h" 275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran#include "resolv_netid.h" 285c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 29ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti#include <arpa/inet.h> 304acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran#include <fcntl.h> 314753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti#include <linux/fib_rules.h> 32a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen#include <map> 335c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include <net/if.h> 344acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran#include <sys/stat.h> 355c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 365c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandrannamespace { 375c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 38f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// BEGIN CONSTANTS -------------------------------------------------------------------------------- 39f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000; 4157947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitticonst uint32_t RULE_PRIORITY_VPN_OVERRIDE_OIF = 10500; 42111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL = 11000; 435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_SECURE_VPN = 12000; 445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; 455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; 465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; 475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; 486a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranconst uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; 4987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t RULE_PRIORITY_TETHERING = 18000; 505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000; 5195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranconst uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000; 5248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000; 535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; 54a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitticonst uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000; 55db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitticonst uint32_t RULE_PRIORITY_UNREACHABLE = 32000; 565c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97; 584acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98; 594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99; 604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 6187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network"; 624acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network"; 634acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system"; 644acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 65bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL = "local"; 66bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_MAIN = "main"; 67bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 685965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not 695965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make 705965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert 715965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// that will warn us if upstream has given these values some other meaning. 725965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_START = 18; 735965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_END = 19; 745965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colittistatic_assert(FRA_UID_START > FRA_MAX, 755965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. " 765965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Check that these values match what the kernel does and then update this assertion."); 775965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 7872723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK; 7972723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL; 804753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 81f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0}; 82f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 83f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; 84f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 85f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst char* const IP_VERSIONS[] = {"-4", "-6"}; 86f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uid_t UID_ROOT = 0; 885ad4e98f7b566ffde39491ee4e80d4a15507f053Lorenzo Colitticonst char* const IIF_LOOPBACK = "lo"; 8987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const IIF_NONE = NULL; 905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst char* const OIF_NONE = NULL; 915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_ADD = true; 925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_DEL = false; 935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool MODIFY_NON_UID_BASED_RULES = true; 945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 954acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 96c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst int RT_TABLES_FLAGS = O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW | O_CLOEXEC; 97c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r-- 984acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 9999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitticonst unsigned ROUTE_FLUSH_ATTEMPTS = 2; 10099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 101f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" 102f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). 103f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconstexpr uint16_t U16_RTA_LENGTH(uint16_t x) { 104f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return RTA_LENGTH(x); 105f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran} 106f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 107f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// These are practically const, but can't be declared so, because they are used to initialize 108f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// non-const pointers ("void* iov_base") in iovec arrays. 109f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; 110f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; 111f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; 112f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; 113f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START }; 114f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END }; 115f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 116f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; 117f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; 118f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 119f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranuint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; 120f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 121f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// END CONSTANTS ---------------------------------------------------------------------------------- 122f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 1234acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// No locks needed because RouteController is accessed only from one thread (in CommandListener). 1244acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranstd::map<std::string, uint32_t> interfaceToTable; 125a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen 1265c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranuint32_t getRouteTableForInterface(const char* interface) { 127a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran uint32_t index = if_nametoindex(interface); 128a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen if (index) { 1294acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; 1304acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran interfaceToTable[interface] = index; 1314acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return index; 1324acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1334acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // If the interface goes away if_nametoindex() will return 0 but we still need to know 1344acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // the index so we can remove the rules and routes. 1354acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran auto iter = interfaceToTable.find(interface); 1364acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (iter == interfaceToTable.end()) { 1374acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 1384acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return RT_TABLE_UNSPEC; 1394acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1404acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return iter->second; 1414acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1424acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1434acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid addTableName(uint32_t table, const std::string& name, std::string* contents) { 1444acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran char tableString[UINT32_STRLEN]; 1454acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran snprintf(tableString, sizeof(tableString), "%u", table); 1464acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += tableString; 1474acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += " "; 1484acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += name; 1494acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += "\n"; 1504acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1514acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1524acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// Doesn't return success/failure as the file is optional; it's okay if we fail to update it. 1534acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid updateTableNamesFile() { 1544acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran std::string contents; 155bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 156bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents); 157bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents); 158bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 15987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents); 1604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); 1614acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); 162bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 1634acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran for (const auto& entry : interfaceToTable) { 1644acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(entry.second, entry.first, &contents); 1654acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1664acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 167c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran int fd = open(RT_TABLES_PATH, RT_TABLES_FLAGS, RT_TABLES_MODE); 1684acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (fd == -1) { 1694acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("failed to create %s (%s)", RT_TABLES_PATH, strerror(errno)); 1704acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return; 171a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen } 1724acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // File creation is affected by umask, so make sure the right mode bits are set. 173c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran if (fchmod(fd, RT_TABLES_MODE) == -1) { 174c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran ALOGE("failed to set mode 0%o on %s (%s)", RT_TABLES_MODE, RT_TABLES_PATH, strerror(errno)); 1754acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1764acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ssize_t bytesWritten = write(fd, contents.data(), contents.size()); 1774acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (bytesWritten != static_cast<ssize_t>(contents.size())) { 1784acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("failed to write to %s (%zd vs %zu bytes) (%s)", RT_TABLES_PATH, bytesWritten, 1794acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran contents.size(), strerror(errno)); 1804acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1814acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran close(fd); 1825c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 1835c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1844753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Sends a netlink request and expects an ack. 1854753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// |iov| is an array of struct iovec that contains the netlink message payload. 1864753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// The netlink header is generated by this function based on |action| and |flags|. 1874753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Returns -errno if there was an error or if the kernel reported an error. 188f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) { 1894753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr nlmsg = { 1904753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_type = action, 1914753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_flags = flags, 1924753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 1934753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_base = &nlmsg; 1944753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_len = sizeof(nlmsg); 1954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti for (int i = 0; i < iovlen; ++i) { 1964753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsg.nlmsg_len += iov[i].iov_len; 1974753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1984753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1994753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int ret; 2004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti struct { 2014753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr msg; 2024753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsgerr err; 2034753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } response; 2044753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2054753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE); 2064753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1 && 207f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS), 208f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran sizeof(NETLINK_ADDRESS)) != -1 && 2094753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti writev(sock, iov, iovlen) != -1 && 2104753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti (ret = recv(sock, &response, sizeof(response), 0)) != -1) { 2114753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (ret == sizeof(response)) { 2124753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = response.err.error; // Netlink errors are negative errno. 213f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret) { 214f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink response contains error (%s)", strerror(-ret)); 215f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 2164753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 2171201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response)); 2184753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -EBADMSG; 2194753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2204753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 221f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno)); 2224753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -errno; 2234753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2244753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2254753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1) { 2264753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti close(sock); 2274753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2284753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2294753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return ret; 2304753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti} 2314753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 23287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 23387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { 23487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (!input) { 23587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = 0; 23687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = 0; 23787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 23887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 23987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = strlcpy(name, input, IFNAMSIZ) + 1; 24087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (*length > IFNAMSIZ) { 24187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); 24287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return -ENAMETOOLONG; 24387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 24487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); 24587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 24687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 24787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 2488fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 2498fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 2508fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the rule 2518fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// returns ENETUNREACH. 2528fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 2538fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 25487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |iif| is non-NULL, the rule matches the specified incoming interface. 25587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |oif| is non-NULL, the rule matches the specified outgoing interface. 25687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that 25787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// range (inclusive). Otherwise, the rule matches packets from all UIDs. 25896f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// 25996f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// Returns 0 on success or negative errno on failure. 260f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 26187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask, const char* iif, 26287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran const char* oif, uid_t uidStart, uid_t uidEnd) { 263f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 264f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (fwmark & ~mask) { 265f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 266f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ERANGE; 267f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 268f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 26987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran // Interface names must include exactly one terminating NULL and be properly padded, or older 2704753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // kernels will refuse to delete rules. 27187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; 27287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran size_t iifLength, oifLength; 27387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint16_t iifPadding, oifPadding; 27487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { 27587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 27687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 27787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { 27887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 2794753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2807619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2815965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti // Either both start and end UID must be specified, or neither. 282f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 283cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 2845965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti return -EUSERS; 2855965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti } 28672723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti bool isUidRule = (uidStart != INVALID_UID); 2875965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 2884753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rule request and put it in an array of iovec structures. 2894753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti fib_rule_hdr rule = { 2905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran .action = static_cast<uint8_t>(table != RT_TABLE_UNSPEC ? FR_ACT_TO_TBL : 2915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran FR_ACT_UNREACHABLE), 2924753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 293a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 29487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; 29587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; 296a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 2974753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iovec iov[] = { 298f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 299f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rule, sizeof(rule) }, 300f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 301f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &priority, sizeof(priority) }, 3025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 3035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 304f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 305f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &fwmark, mask ? sizeof(fwmark) : 0 }, 306f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 307f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &mask, mask ? sizeof(mask) : 0 }, 308f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 }, 309f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidStart, isUidRule ? sizeof(uidStart) : 0 }, 310f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 }, 311f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 }, 31287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, 31387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { iifName, iifLength }, 31487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, iifPadding }, 31587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, 31687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { oifName, oifLength }, 31787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, oifPadding }, 3184753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 3194753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 32072723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; 321f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 322f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rule.family = AF_FAMILIES[i]; 323f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) { 32496f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return ret; 3255c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3265c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3275c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 32896f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return 0; 3295c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 3305c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 33187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 33287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask) { 33387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, 33487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID); 33587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 33687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 337ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Adds or deletes an IPv4 or IPv6 route. 338ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Returns 0 on success or negative errno on failure. 339f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 340f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran const char* destination, const char* nexthop) { 341ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // At least the destination must be non-null. 342ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!destination) { 343f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("null destination"); 344ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EFAULT; 345ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 346ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 347ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // Parse the prefix. 348ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawAddress[sizeof(in6_addr)]; 349f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t family; 350f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t prefixLength; 351ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 352ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti &prefixLength); 353ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (rawLength < 0) { 354f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 355ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return rawLength; 356ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 3577619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 358ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 3591201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 360ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 361ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 362ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 363de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t type = RTN_UNICAST; 364ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint32_t ifindex; 365de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t rawNexthop[sizeof(in6_addr)]; 366de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran 367de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && !strcmp(nexthop, "unreachable")) { 368de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran type = RTN_UNREACHABLE; 369de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup 370de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for 371de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.) 372de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran interface = OIF_NONE; 373de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran nexthop = NULL; 3744c95a125e0930c112555437589f7620575482095Lorenzo Colitti } else if (nexthop && !strcmp(nexthop, "throw")) { 3754c95a125e0930c112555437589f7620575482095Lorenzo Colitti type = RTN_THROW; 3764c95a125e0930c112555437589f7620575482095Lorenzo Colitti interface = OIF_NONE; 3774c95a125e0930c112555437589f7620575482095Lorenzo Colitti nexthop = NULL; 378de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } else { 379de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If an interface was specified, find the ifindex. 380de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (interface != OIF_NONE) { 381de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ifindex = if_nametoindex(interface); 382de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (!ifindex) { 383de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 384de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -ENODEV; 385de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 3867619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 3877619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 388de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If a nexthop was specified, parse it as the same family as the prefix. 389de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 390de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("inet_pton failed for nexthop %s", nexthop); 391de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -EINVAL; 392de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 393ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 394ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 3954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rtmsg and put it in an array of iovec structures. 396f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtmsg route = { 397ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_protocol = RTPROT_STATIC, 398de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran .rtm_type = type, 399ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_family = family, 400ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_dst_len = prefixLength, 4012bff72e0cf091f4d71af0c81cfc74e8ebd8c6644Sreeram Ramachandran .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK), 402ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 4034753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 404f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 405f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 406ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 407ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti iovec iov[] = { 408f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 409f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &route, sizeof(route) }, 410f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 411f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &table, sizeof(table) }, 412f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaDst, sizeof(rtaDst) }, 413f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawAddress, static_cast<size_t>(rawLength) }, 4145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 4155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 416f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 417f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 418ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 419ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 420f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : 421f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran NETLINK_REQUEST_FLAGS; 4224753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov)); 4237619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 4247619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 4255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// An iptables rule to mark incoming packets on a network with the netId of the network. 4265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is so that the kernel can: 4285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 4295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// replies, SYN-ACKs, etc). 4305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Mark sockets that accept connections from this interface so that the connection stays on the 4315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// same interface. 4325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 4335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 4375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = true; 4395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 441b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran char markString[UINT32_HEX_STRLEN]; 4425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue); 4435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 444b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j", 445b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran "MARK", "--set-mark", markString, NULL)) { 446b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran ALOGE("failed to change iptables rule that sets incoming packet mark"); 447b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return -EREMOTEIO; 448b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 4495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 450b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 451b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 452b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 453111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// A rule to route responses to the local network forwarded via the VPN. 454111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// 455111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// When a VPN is in effect, packets from the local network to upstream networks are forwarded into 456111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel. 457111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) { 458111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL, 459111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE, 460111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran INVALID_UID, INVALID_UID); 461111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran} 462111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran 463fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to route all traffic from a given set of UIDs to go over the VPN. 464fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 465fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 466fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 467fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// bypass the VPN if the protectedFromVpn bit is set. 468fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 46995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, bool add) { 470fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 471fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 472fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 473fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.protectedFromVpn = false; 474fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.protectedFromVpn = true; 475fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 47695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority; 47795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 47895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (secure) { 47995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_SECURE_VPN; 48095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } else { 48195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_BYPASSABLE_VPN; 48295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 48395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran fwmark.explicitlySelected = false; 48495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.explicitlySelected = true; 48595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } 48695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 48795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 4885ad4e98f7b566ffde39491ee4e80d4a15507f053Lorenzo Colitti mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd); 489fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 490fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 491fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 492fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// set of UIDs. 493fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 494fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 495fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// target set, but where the DnsProxyListener itself is not. 49695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure, 49795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool add) { 498fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 499fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 500fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 501fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.netId = netId; 502fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 503fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 504fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 505fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 506fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 50795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN; 50895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 50995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 51095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue); 511fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 512fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 5135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on an explicitly chosen network. 5145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 5165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 5185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// to check it again in the rules here, because a network's permissions may have been updated via 5195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// modifyNetworkPermission(). 5205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 5215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 523eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark fwmark; 524eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark mask; 525eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 526eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran fwmark.netId = netId; 527eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 528eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 5305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 531eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 5345c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 53687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); 5375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5385c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on a chosen outgoing interface. 5405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 5425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// the outgoing interface (typically for link-local communications). 54357947f02c00bb03651e3f9427c880211c689db7fLorenzo ColittiWARN_UNUSED_RESULT int modifyOutputInterfaceRules(const char* interface, uint32_t table, 54457947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti Permission permission, uid_t uidStart, 54557947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti uid_t uidEnd, bool add) { 546122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 547122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 5485c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 549f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 550f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran mask.permission = permission; 5515c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 55257947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti // If this rule does not specify a UID range, then also add a corresponding high-priority rule 55357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti // for UID. This covers forwarded packets and system daemons such as the tethering DHCP server. 55457947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (uidStart == INVALID_UID && uidEnd == INVALID_UID) { 55557947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OVERRIDE_OIF, 55657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti table, fwmark.intValue, mask.intValue, IIF_NONE, interface, 55757947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti UID_ROOT, UID_ROOT)) { 55857947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti return ret; 55957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti } 56057947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti } 56157947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti 5625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 56387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd); 5645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on the chosen network. 5675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is for sockets that have not explicitly requested a particular network, but have been 5695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bound to one when they called connect(). This ensures that sockets connected on a particular 5705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// network stay on that network even if the default network changes. 5715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, 5725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 5735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 576122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 577122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 578122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 5795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 580122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 5815c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5825009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 584eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 58687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 5875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5885c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 58948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// A rule to enable split tunnel VPNs. 59048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// 59148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to 59248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// go over the default network, provided it wasn't explicitly restricted to the VPN and has the 59348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// permissions required by the default network. 59448e19b037e7e20674048ef76bf31ce65c741347cSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId, 59548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 59648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 59748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran uint32_t table = getRouteTableForInterface(physicalInterface); 59848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 59948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return -ESRCH; 60048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran } 60148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 60248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark fwmark; 60348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark mask; 60448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 60548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.netId = vpnNetId; 60648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 60748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 60848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.explicitlySelected = false; 60948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.explicitlySelected = true; 61048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 61148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.permission = permission; 61248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.permission = permission; 61348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 61448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue, 61548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.intValue); 61648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 61748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 618fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to allow legacy routes added through the requestRouteToHost() API. 619fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLegacyRouteRules() { 6205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 623fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 624fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 626fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // Rules to allow legacy routes to override the default network. 627fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 628fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue)) { 629fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 630fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 631fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 632fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { 633fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 634fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 635fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 636fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 637fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 638fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 639fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // A rule to allow legacy routes from system apps to override VPNs. 640fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 641fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue); 6425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 644fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to lookup the local network when specified explicitly or otherwise. 645fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) { 646fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 647fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran INVALID_UID, INVALID_UID, ACTION_ADD)) { 648fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 649fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 650fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 6515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 654fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 655fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 657fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, 65887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 6595c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 6605c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 6613667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colittiint configureDummyNetwork() { 6623667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti const char *interface = DummyNetwork::INTERFACE_NAME; 6633667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti uint32_t table = getRouteTableForInterface(interface); 6643667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (table == RT_TABLE_UNSPEC) { 6653667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // getRouteTableForInterface has already looged an error. 6663667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -ESRCH; 6673667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6683667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6693667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_init(); 6703667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti int ret = ifc_up(interface); 6713667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_close(); 6723667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (ret) { 6733667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't bring up %s: %s", interface, strerror(errno)); 6743667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -errno; 6753667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6763667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 67757947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if ((ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, 67857947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti INVALID_UID, INVALID_UID, ACTION_ADD))) { 67957947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti ALOGE("Can't create oif rules for %s: %s", interface, strerror(-ret)); 6803667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6813667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6823667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6833667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "0.0.0.0/0", NULL))) { 6843667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't add IPv4 default route to %s: %s", interface, strerror(-ret)); 6853667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6863667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6873667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6883667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "::/0", NULL))) { 6893667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't add IPv6 default route to %s: %s", interface, strerror(-ret)); 6903667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6913667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6923667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6933667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return 0; 6943667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti} 6953667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 696a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti// Add a new rule to look up the 'main' table, with the same selectors as the "default network" 697db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule, but with a lower priority. We will never create routes in the main table; it should only be 698db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// used for directly-connected routes implicitly created by the kernel when adding IP addresses. 699db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// This is necessary, for example, when adding a route through a directly-connected gateway: in 700db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// order to add the route, there must already be a directly-connected route that covers the gateway. 701a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo ColittiWARN_UNUSED_RESULT int addDirectlyConnectedRule() { 702a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark fwmark; 703a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark mask; 704a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 705a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.netId = NETID_UNSET; 706a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti mask.netId = FWMARK_NET_ID_MASK; 707a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 708a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN, 709a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, UID_ROOT, UID_ROOT); 710a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti} 711a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 712db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that 713db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended 714db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable 715db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule will hopefully make things even clearer. 716fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addUnreachableRule() { 717fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET, 718fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran MARK_UNSET); 71987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 72087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 72187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { 7226a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 7236a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 7246a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 72557947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti return modifyOutputInterfaceRules(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 72657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti INVALID_UID, INVALID_UID, add); 7276a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 7286a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 7295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface, 7305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 7314043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7334043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return -ESRCH; 7344043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 7354043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 7375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 7405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 74357947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyOutputInterfaceRules(interface, table, permission, INVALID_UID, INVALID_UID, 7445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyImplicitNetworkRule(netId, table, permission, add); 7485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 7494043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface, 75195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran const UidRanges& uidRanges, bool secure, bool add, 7525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran bool modifyNonUidBasedRules) { 7535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 7565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 757b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 758e09b20aee85f1dfd8c18c3d8581ac875d939ba70Sreeram Ramachandran for (const UidRanges::Range& range : uidRanges.getRanges()) { 75995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, secure, add)) { 760fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 761fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 7625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first, 7635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 764b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 765b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 76657947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti if (int ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, range.first, 76757947f02c00bb03651e3f9427c880211c689db7fLorenzo Colitti range.second, add)) { 768b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 769b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 771eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 7725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (modifyNonUidBasedRules) { 7735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 774b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 775b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 776111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran if (int ret = modifyVpnOutputToLocalRule(interface, add)) { 777111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return ret; 778111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran } 77995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) { 780b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 781b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 782fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add); 783b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7844043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 785b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 7864043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 7874043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface, 7895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 7909c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 79296f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return -ESRCH; 7939c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 7949c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 795122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 796122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 797f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 7985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 799122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 800f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 801f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 802122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 8039c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 8045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 80587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran mask.intValue); 8067619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 8077619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 808fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyTetheredNetwork(uint16_t action, const char* inputInterface, 809fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran const char* outputInterface) { 810fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran uint32_t table = getRouteTableForInterface(outputInterface); 811fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 812fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return -ESRCH; 813fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 814fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 815fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, 816fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 817fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 818fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 819b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 820b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram RamachandranWARN_UNUSED_RESULT int flushRules() { 821b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 822b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran const char* argv[] = { 823b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_PATH, 824b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_VERSIONS[i], 825b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "rule", 826b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "flush", 827b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran }; 828b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { 829b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran ALOGE("failed to flush rules"); 830b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return -EREMOTEIO; 831b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 832b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 833b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return 0; 834b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran} 835b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran 836f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected 837f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// route, to the main table as well. 838f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// Returns 0 on success or negative errno on failure. 839eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram RamachandranWARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination, 840eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, RouteController::TableType tableType) { 8415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table; 84238b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran switch (tableType) { 84338b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran case RouteController::INTERFACE: { 84438b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran table = getRouteTableForInterface(interface); 8455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 8465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 8475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 84838b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 84938b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 85087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran case RouteController::LOCAL_NETWORK: { 85187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran table = ROUTE_TABLE_LOCAL_NETWORK; 85287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran break; 85387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 8545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_NETWORK: { 8554acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_NETWORK; 85638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 85738b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_SYSTEM: { 8594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_SYSTEM; 86038b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 86138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 86238b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8639c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 864f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti int ret = modifyIpRoute(action, table, interface, destination, nexthop); 86564166e7666e3cc7f4b9c715f2b4e19d28ae44c5aSreeram Ramachandran // Trying to add a route that already exists shouldn't cause an error. 86664166e7666e3cc7f4b9c715f2b4e19d28ae44c5aSreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { 867f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 868c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 869c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 870f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return 0; 8719c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 8729c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 873f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 874f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int flushRoutes(const char* interface) { 87592b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 8765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 877f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ESRCH; 87892b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 87992b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 880357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti char tableString[UINT32_STRLEN]; 881357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti snprintf(tableString, sizeof(tableString), "%u", table); 882357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 88399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int ret = 0; 884f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 885357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti const char* argv[] = { 886357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti IP_PATH, 887f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran IP_VERSIONS[i], 88872999d6cfc1df23cd911b85730f1f532fb62bed4Sreeram Ramachandran "route", 889357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "flush", 890357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "table", 891357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti tableString, 892357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti }; 89399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 89499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // A flush works by dumping routes and deleting each route as it's returned, and it can 89599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // fail if something else deletes the route between the dump and the delete. This can 89699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // happen, for example, if an interface goes down while we're trying to flush its routes. 89799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // So try multiple times and only return an error if the last attempt fails. 89899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // 89999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // TODO: replace this with our own netlink code. 90099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti unsigned attempts = 0; 90199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int err; 90299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti do { 90399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti err = android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), 90499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti NULL, false, false); 90599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ++attempts; 90699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } while (err != 0 && attempts < ROUTE_FLUSH_ATTEMPTS); 90799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (err) { 90899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ALOGE("failed to flush %s routes in table %s after %d attempts", 90999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti IP_VERSIONS[i], tableString, attempts); 91099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ret = -EREMOTEIO; 911357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 912357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 913357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 91499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // If we failed to flush routes, the caller may elect to keep this interface around, so keep 91599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // track of its name. 91699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (!ret) { 91799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti interfaceToTable.erase(interface); 91899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } 91999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 92099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti return ret; 92192b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 92292b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 9235c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} // namespace 9245c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 92587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::Init(unsigned localNetId) { 926b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (int ret = flushRules()) { 927b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 928b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 92987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = addLegacyRouteRules()) { 930f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 931f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 932fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addLocalNetworkRules(localNetId)) { 933b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 934f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 935a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti if (int ret = addDirectlyConnectedRule()) { 936a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return ret; 937a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti } 938fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addUnreachableRule()) { 93987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 94087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 9413667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // Don't complain if we can't add the dummy network, since not all devices support it. 9423667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti configureDummyNetwork(); 9433667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 9444acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 945f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 9468fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 9478fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 9486a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { 94987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_ADD); 9506a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9516a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9526a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { 95387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_DEL); 9546a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9556a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 9575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9584acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { 9594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9614acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9624acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9635c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 9645c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 9655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 9665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 968f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 969f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 9704acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 9714acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9724acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9734acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9744acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 975379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 976379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 9775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 97895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 97995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 9804acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 9814acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9824acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9834acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9844acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9854043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 9864043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 9875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 98895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 98995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 9905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 9914043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return ret; 9924043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 9934acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 9944acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9954acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9964acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9974acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9984043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 9994043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 10005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 10015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission oldPermission, 10025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission newPermission) { 1003379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 10045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 1005f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 1006f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 10075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 1008b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1009b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 101095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranint RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure, 10115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 101295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 10135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 1014b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1015b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 10165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 101795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 101895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 10195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 10209c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10219c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 10235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 10249c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10259c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 10275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 10285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 10295c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 10307619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1031f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 1032eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran TableType tableType) { 1033eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 10347619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 10357619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1036f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colittiint RouteController::removeRoute(const char* interface, const char* destination, 1037eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, TableType tableType) { 1038eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 10397619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 104087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 104187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { 1042fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface); 104387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 104487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 104587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { 1046fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface); 104787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 104848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 104948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface, 105048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 105148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission); 105248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 105348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 105448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId, 105548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 105648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 105748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission); 105848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 1059