RouteController.cpp revision 5ad4e98f7b566ffde39491ee4e80d4a15507f053
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; 41111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL = 11000; 425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_SECURE_VPN = 12000; 435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; 445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; 455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; 465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; 476a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranconst uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; 4887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t RULE_PRIORITY_TETHERING = 18000; 495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000; 5095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranconst uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000; 5148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000; 525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; 53a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitticonst uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000; 54db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitticonst uint32_t RULE_PRIORITY_UNREACHABLE = 32000; 555c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97; 574acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98; 584acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99; 594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 6087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network"; 614acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network"; 624acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system"; 634acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 64bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LOCAL = "local"; 65bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_MAIN = "main"; 66bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 675965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not 685965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make 695965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert 705965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// that will warn us if upstream has given these values some other meaning. 715965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_START = 18; 725965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_END = 19; 735965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colittistatic_assert(FRA_UID_START > FRA_MAX, 745965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. " 755965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Check that these values match what the kernel does and then update this assertion."); 765965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 7772723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK; 7872723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL; 794753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 80f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0}; 81f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 82f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; 83f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 84f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst char* const IP_VERSIONS[] = {"-4", "-6"}; 85f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uid_t UID_ROOT = 0; 875ad4e98f7b566ffde39491ee4e80d4a15507f053Lorenzo Colitticonst char* const IIF_LOOPBACK = "lo"; 8887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranconst char* const IIF_NONE = NULL; 895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst char* const OIF_NONE = NULL; 905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_ADD = true; 915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_DEL = false; 925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool MODIFY_NON_UID_BASED_RULES = true; 935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 944acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 95c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst int RT_TABLES_FLAGS = O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW | O_CLOEXEC; 96c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r-- 974acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 9899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitticonst unsigned ROUTE_FLUSH_ATTEMPTS = 2; 9999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 100f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" 101f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). 102f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconstexpr uint16_t U16_RTA_LENGTH(uint16_t x) { 103f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return RTA_LENGTH(x); 104f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran} 105f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 106f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// These are practically const, but can't be declared so, because they are used to initialize 107f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// non-const pointers ("void* iov_base") in iovec arrays. 108f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; 109f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; 110f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; 111f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; 112f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START }; 113f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END }; 114f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 115f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; 116f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; 117f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 118f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranuint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; 119f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 120f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// END CONSTANTS ---------------------------------------------------------------------------------- 121f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 1224acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// No locks needed because RouteController is accessed only from one thread (in CommandListener). 1234acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranstd::map<std::string, uint32_t> interfaceToTable; 124a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen 1255c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranuint32_t getRouteTableForInterface(const char* interface) { 126a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran uint32_t index = if_nametoindex(interface); 127a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen if (index) { 1284acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; 1294acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran interfaceToTable[interface] = index; 1304acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return index; 1314acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1324acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // If the interface goes away if_nametoindex() will return 0 but we still need to know 1334acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // the index so we can remove the rules and routes. 1344acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran auto iter = interfaceToTable.find(interface); 1354acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (iter == interfaceToTable.end()) { 1364acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 1374acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return RT_TABLE_UNSPEC; 1384acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1394acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return iter->second; 1404acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1414acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1424acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid addTableName(uint32_t table, const std::string& name, std::string* contents) { 1434acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran char tableString[UINT32_STRLEN]; 1444acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran snprintf(tableString, sizeof(tableString), "%u", table); 1454acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += tableString; 1464acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += " "; 1474acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += name; 1484acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += "\n"; 1494acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1504acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1514acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// Doesn't return success/failure as the file is optional; it's okay if we fail to update it. 1524acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid updateTableNamesFile() { 1534acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran std::string contents; 154bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 155bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents); 156bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents); 157bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 15887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents); 1594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); 1604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); 161bb40d5198943df0e2a88514cbcd82a23a5b0cd97Sreeram Ramachandran 1624acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran for (const auto& entry : interfaceToTable) { 1634acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(entry.second, entry.first, &contents); 1644acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1654acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 166c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran int fd = open(RT_TABLES_PATH, RT_TABLES_FLAGS, RT_TABLES_MODE); 1674acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (fd == -1) { 1684acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("failed to create %s (%s)", RT_TABLES_PATH, strerror(errno)); 1694acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return; 170a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen } 1714acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // File creation is affected by umask, so make sure the right mode bits are set. 172c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran if (fchmod(fd, RT_TABLES_MODE) == -1) { 173c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran ALOGE("failed to set mode 0%o on %s (%s)", RT_TABLES_MODE, RT_TABLES_PATH, strerror(errno)); 1744acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1754acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ssize_t bytesWritten = write(fd, contents.data(), contents.size()); 1764acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (bytesWritten != static_cast<ssize_t>(contents.size())) { 1774acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("failed to write to %s (%zd vs %zu bytes) (%s)", RT_TABLES_PATH, bytesWritten, 1784acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran contents.size(), strerror(errno)); 1794acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1804acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran close(fd); 1815c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 1825c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1834753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Sends a netlink request and expects an ack. 1844753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// |iov| is an array of struct iovec that contains the netlink message payload. 1854753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// The netlink header is generated by this function based on |action| and |flags|. 1864753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Returns -errno if there was an error or if the kernel reported an error. 187f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) { 1884753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr nlmsg = { 1894753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_type = action, 1904753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_flags = flags, 1914753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 1924753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_base = &nlmsg; 1934753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_len = sizeof(nlmsg); 1944753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti for (int i = 0; i < iovlen; ++i) { 1954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsg.nlmsg_len += iov[i].iov_len; 1964753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1974753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1984753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int ret; 1994753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti struct { 2004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr msg; 2014753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsgerr err; 2024753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } response; 2034753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2044753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE); 2054753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1 && 206f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS), 207f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran sizeof(NETLINK_ADDRESS)) != -1 && 2084753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti writev(sock, iov, iovlen) != -1 && 2094753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti (ret = recv(sock, &response, sizeof(response), 0)) != -1) { 2104753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (ret == sizeof(response)) { 2114753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = response.err.error; // Netlink errors are negative errno. 212f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret) { 213f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink response contains error (%s)", strerror(-ret)); 214f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 2154753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 2161201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response)); 2174753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -EBADMSG; 2184753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2194753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 220f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno)); 2214753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -errno; 2224753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2234753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2244753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1) { 2254753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti close(sock); 2264753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2274753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2284753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return ret; 2294753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti} 2304753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 23187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 23287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { 23387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (!input) { 23487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = 0; 23587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = 0; 23687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 23787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 23887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *length = strlcpy(name, input, IFNAMSIZ) + 1; 23987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (*length > IFNAMSIZ) { 24087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); 24187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return -ENAMETOOLONG; 24287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 24387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); 24487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return 0; 24587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 24687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 2478fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 2488fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 2498fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the rule 2508fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// returns ENETUNREACH. 2518fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 2528fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 25387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |iif| is non-NULL, the rule matches the specified incoming interface. 25487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |oif| is non-NULL, the rule matches the specified outgoing interface. 25587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that 25687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran// range (inclusive). Otherwise, the rule matches packets from all UIDs. 25796f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// 25896f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// Returns 0 on success or negative errno on failure. 259f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 26087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask, const char* iif, 26187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran const char* oif, uid_t uidStart, uid_t uidEnd) { 262f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 263f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (fwmark & ~mask) { 264f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 265f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ERANGE; 266f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 267f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 26887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran // Interface names must include exactly one terminating NULL and be properly padded, or older 2694753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // kernels will refuse to delete rules. 27087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; 27187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran size_t iifLength, oifLength; 27287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint16_t iifPadding, oifPadding; 27387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { 27487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 27587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 27687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { 27787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 2784753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2797619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2805965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti // Either both start and end UID must be specified, or neither. 281f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 282cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 2835965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti return -EUSERS; 2845965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti } 28572723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti bool isUidRule = (uidStart != INVALID_UID); 2865965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 2874753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rule request and put it in an array of iovec structures. 2884753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti fib_rule_hdr rule = { 2895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran .action = static_cast<uint8_t>(table != RT_TABLE_UNSPEC ? FR_ACT_TO_TBL : 2905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran FR_ACT_UNREACHABLE), 2914753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 292a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 29387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; 29487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; 295a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 2964753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iovec iov[] = { 297f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 298f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rule, sizeof(rule) }, 299f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 300f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &priority, sizeof(priority) }, 3015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 3025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 303f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 304f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &fwmark, mask ? sizeof(fwmark) : 0 }, 305f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 306f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &mask, mask ? sizeof(mask) : 0 }, 307f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 }, 308f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidStart, isUidRule ? sizeof(uidStart) : 0 }, 309f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 }, 310f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 }, 31187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, 31287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { iifName, iifLength }, 31387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, iifPadding }, 31487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, 31587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { oifName, oifLength }, 31687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran { PADDING_BUFFER, oifPadding }, 3174753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 3184753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 31972723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; 320f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 321f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rule.family = AF_FAMILIES[i]; 322f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) { 32396f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return ret; 3245c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3255c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 3265c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 32796f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return 0; 3285c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 3295c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 33087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 33187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran uint32_t fwmark, uint32_t mask) { 33287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, 33387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID); 33487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 33587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 336ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Adds or deletes an IPv4 or IPv6 route. 337ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Returns 0 on success or negative errno on failure. 338f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 339f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran const char* destination, const char* nexthop) { 340ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // At least the destination must be non-null. 341ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!destination) { 342f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("null destination"); 343ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EFAULT; 344ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 345ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 346ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // Parse the prefix. 347ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawAddress[sizeof(in6_addr)]; 348f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t family; 349f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t prefixLength; 350ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 351ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti &prefixLength); 352ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (rawLength < 0) { 353f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 354ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return rawLength; 355ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 3567619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 357ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 3581201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 359ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 360ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 361ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 362de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t type = RTN_UNICAST; 363ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint32_t ifindex; 364de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran uint8_t rawNexthop[sizeof(in6_addr)]; 365de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran 366de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && !strcmp(nexthop, "unreachable")) { 367de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran type = RTN_UNREACHABLE; 368de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup 369de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for 370de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.) 371de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran interface = OIF_NONE; 372de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran nexthop = NULL; 3734c95a125e0930c112555437589f7620575482095Lorenzo Colitti } else if (nexthop && !strcmp(nexthop, "throw")) { 3744c95a125e0930c112555437589f7620575482095Lorenzo Colitti type = RTN_THROW; 3754c95a125e0930c112555437589f7620575482095Lorenzo Colitti interface = OIF_NONE; 3764c95a125e0930c112555437589f7620575482095Lorenzo Colitti nexthop = NULL; 377de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } else { 378de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If an interface was specified, find the ifindex. 379de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (interface != OIF_NONE) { 380de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ifindex = if_nametoindex(interface); 381de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (!ifindex) { 382de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 383de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -ENODEV; 384de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 3857619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 3867619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 387de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran // If a nexthop was specified, parse it as the same family as the prefix. 388de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 389de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran ALOGE("inet_pton failed for nexthop %s", nexthop); 390de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran return -EINVAL; 391de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran } 392ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 393ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 3944753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rtmsg and put it in an array of iovec structures. 395f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtmsg route = { 396ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_protocol = RTPROT_STATIC, 397de5d5df753dd35d852ac47a6174b06eacd0d5523Sreeram Ramachandran .rtm_type = type, 398ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_family = family, 399ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_dst_len = prefixLength, 4002bff72e0cf091f4d71af0c81cfc74e8ebd8c6644Sreeram Ramachandran .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK), 401ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 4024753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 403f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 404f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 405ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 406ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti iovec iov[] = { 407f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 408f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &route, sizeof(route) }, 409f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 410f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &table, sizeof(table) }, 411f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaDst, sizeof(rtaDst) }, 412f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawAddress, static_cast<size_t>(rawLength) }, 4135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 4145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 415f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 416f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 417ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 418ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 419f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : 420f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran NETLINK_REQUEST_FLAGS; 4214753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov)); 4227619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 4237619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 4245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// An iptables rule to mark incoming packets on a network with the netId of the network. 4255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is so that the kernel can: 4275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 4285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// replies, SYN-ACKs, etc). 4295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Mark sockets that accept connections from this interface so that the connection stays on the 4305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// same interface. 4315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 4325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 4365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = true; 4385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 440b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran char markString[UINT32_HEX_STRLEN]; 4415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue); 4425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 443b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j", 444b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran "MARK", "--set-mark", markString, NULL)) { 445b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran ALOGE("failed to change iptables rule that sets incoming packet mark"); 446b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return -EREMOTEIO; 447b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 4485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 449b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 450b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 451b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 452111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// A rule to route responses to the local network forwarded via the VPN. 453111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// 454111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// When a VPN is in effect, packets from the local network to upstream networks are forwarded into 455111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel. 456111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) { 457111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL, 458111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE, 459111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran INVALID_UID, INVALID_UID); 460111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran} 461111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran 462fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to route all traffic from a given set of UIDs to go over the VPN. 463fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 464fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 465fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 466fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// bypass the VPN if the protectedFromVpn bit is set. 467fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 46895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, bool add) { 469fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 470fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 471fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 472fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.protectedFromVpn = false; 473fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.protectedFromVpn = true; 474fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 47595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority; 47695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 47795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (secure) { 47895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_SECURE_VPN; 47995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } else { 48095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran priority = RULE_PRIORITY_BYPASSABLE_VPN; 48195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 48295684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran fwmark.explicitlySelected = false; 48395684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.explicitlySelected = true; 48495684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran } 48595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 48695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 4875ad4e98f7b566ffde39491ee4e80d4a15507f053Lorenzo Colitti mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd); 488fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 489fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 490fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 491fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// set of UIDs. 492fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// 493fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 494fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// target set, but where the DnsProxyListener itself is not. 49595684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure, 49695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool add) { 497fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark fwmark; 498fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran Fwmark mask; 499fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 500fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.netId = netId; 501fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 502fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 503fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 504fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 505fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 50695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN; 50795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran 50895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 50995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran mask.intValue); 510fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 511fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 5125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on an explicitly chosen network. 5135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 5155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 5175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// to check it again in the rules here, because a network's permissions may have been updated via 5185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// modifyNetworkPermission(). 5195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 5205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 522eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark fwmark; 523eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark mask; 524eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 525eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran fwmark.netId = netId; 526eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 527eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 5295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 530eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 5335c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 53587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); 5365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5375c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on a chosen outgoing interface. 5395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 5415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// the outgoing interface (typically for link-local communications). 5425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyOutputInterfaceRule(const char* interface, uint32_t table, 5435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 5445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 545122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 546122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 5475c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 548f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 549f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran mask.permission = permission; 5505c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 55287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd); 5535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on the chosen network. 5565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is for sockets that have not explicitly requested a particular network, but have been 5585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bound to one when they called connect(). This ensures that sockets connected on a particular 5595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// network stay on that network even if the default network changes. 5605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, 5615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 5625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 565122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 566122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 567122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 5685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 569122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 5705c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 573eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 57587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 5765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5775c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 57848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// A rule to enable split tunnel VPNs. 57948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// 58048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to 58148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// go over the default network, provided it wasn't explicitly restricted to the VPN and has the 58248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran// permissions required by the default network. 58348e19b037e7e20674048ef76bf31ce65c741347cSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId, 58448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 58548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 58648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran uint32_t table = getRouteTableForInterface(physicalInterface); 58748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 58848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return -ESRCH; 58948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran } 59048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 59148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark fwmark; 59248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Fwmark mask; 59348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 59448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.netId = vpnNetId; 59548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 59648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 59748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.explicitlySelected = false; 59848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.explicitlySelected = true; 59948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 60048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran fwmark.permission = permission; 60148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.permission = permission; 60248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 60348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue, 60448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran mask.intValue); 60548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 60648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 607fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to allow legacy routes added through the requestRouteToHost() API. 608fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLegacyRouteRules() { 6095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 612fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 613fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 615fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // Rules to allow legacy routes to override the default network. 616fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 617fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue)) { 618fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 619fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 620fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 621fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { 622fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 623fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 624fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 625fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 626fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 627fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 628fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran // A rule to allow legacy routes from system apps to override VPNs. 629fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 630fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.intValue, mask.intValue); 6315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 6325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 633fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran// Add rules to lookup the local network when specified explicitly or otherwise. 634fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) { 635fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 636fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran INVALID_UID, INVALID_UID, ACTION_ADD)) { 637fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 638fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 639fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 6405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 6415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 6425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 643fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran fwmark.explicitlySelected = false; 644fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran mask.explicitlySelected = true; 6455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 646fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, 64787475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran fwmark.intValue, mask.intValue); 6485c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 6495c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 6503667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colittiint configureDummyNetwork() { 6513667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti const char *interface = DummyNetwork::INTERFACE_NAME; 6523667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti uint32_t table = getRouteTableForInterface(interface); 6533667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (table == RT_TABLE_UNSPEC) { 6543667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // getRouteTableForInterface has already looged an error. 6553667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -ESRCH; 6563667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6573667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6583667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_init(); 6593667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti int ret = ifc_up(interface); 6603667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ifc_close(); 6613667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if (ret) { 6623667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't bring up %s: %s", interface, strerror(errno)); 6633667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return -errno; 6643667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6653667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6663667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyOutputInterfaceRule(interface, table, PERMISSION_NONE, 6673667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti INVALID_UID, INVALID_UID, ACTION_ADD))) { 6683667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't create oif rule for %s: %s", interface, strerror(-ret)); 6693667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6703667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6713667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6723667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "0.0.0.0/0", NULL))) { 6733667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't add IPv4 default route to %s: %s", interface, strerror(-ret)); 6743667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6753667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6763667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6773667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "::/0", NULL))) { 6783667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti ALOGE("Can't add IPv6 default route to %s: %s", interface, strerror(-ret)); 6793667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return ret; 6803667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti } 6813667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 6823667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti return 0; 6833667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti} 6843667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 685a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti// Add a new rule to look up the 'main' table, with the same selectors as the "default network" 686db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule, but with a lower priority. We will never create routes in the main table; it should only be 687db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// used for directly-connected routes implicitly created by the kernel when adding IP addresses. 688db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// This is necessary, for example, when adding a route through a directly-connected gateway: in 689db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// order to add the route, there must already be a directly-connected route that covers the gateway. 690a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo ColittiWARN_UNUSED_RESULT int addDirectlyConnectedRule() { 691a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark fwmark; 692a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti Fwmark mask; 693a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 694a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.netId = NETID_UNSET; 695a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti mask.netId = FWMARK_NET_ID_MASK; 696a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 697a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN, 698a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, UID_ROOT, UID_ROOT); 699a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti} 700a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti 701db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that 702db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended 703db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable 704db74dba7ccfe9e9504e0acd440a23fed96682842Lorenzo Colitti// rule will hopefully make things even clearer. 705fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int addUnreachableRule() { 706fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET, 707fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran MARK_UNSET); 70887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 70987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 71087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram RamachandranWARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { 7116a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 7126a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 7136a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 71487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyOutputInterfaceRule(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 71587475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran INVALID_UID, INVALID_UID, add); 7166a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 7176a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 7185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface, 7195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 7204043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7224043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return -ESRCH; 7234043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 7244043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 7265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 7295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, permission, INVALID_UID, INVALID_UID, 7335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 7345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 7355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 7365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyImplicitNetworkRule(netId, table, permission, add); 7375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 7384043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface, 74095684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran const UidRanges& uidRanges, bool secure, bool add, 7415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran bool modifyNonUidBasedRules) { 7425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 7445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 7455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 746b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 747e09b20aee85f1dfd8c18c3d8581ac875d939ba70Sreeram Ramachandran for (const UidRanges::Range& range : uidRanges.getRanges()) { 74895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, secure, add)) { 749fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return ret; 750fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 7515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first, 7525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 753b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 754b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, PERMISSION_NONE, range.first, 7565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 757b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 758b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 760eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 7615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (modifyNonUidBasedRules) { 7625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 763b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 764b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 765111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran if (int ret = modifyVpnOutputToLocalRule(interface, add)) { 766111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran return ret; 767111bec203e82bdc9fb2c27df7c232465dffeee5fSreeram Ramachandran } 76895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) { 769b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 770b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 771fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add); 772b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 7734043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 774b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 7754043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 7764043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface, 7785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 7799c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 78196f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return -ESRCH; 7829c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 7839c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 784122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 785122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 786f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 7875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 788122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 789f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 790f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 791122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 7929c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 7935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 79487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran mask.intValue); 7957619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 7967619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 797fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram RamachandranWARN_UNUSED_RESULT int modifyTetheredNetwork(uint16_t action, const char* inputInterface, 798fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran const char* outputInterface) { 799fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran uint32_t table = getRouteTableForInterface(outputInterface); 800fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 801fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return -ESRCH; 802fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran } 803fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 804fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, 805fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 806fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran} 807fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran 808b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 809b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram RamachandranWARN_UNUSED_RESULT int flushRules() { 810b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 811b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran const char* argv[] = { 812b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_PATH, 813b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran IP_VERSIONS[i], 814b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "rule", 815b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran "flush", 816b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran }; 817b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { 818b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran ALOGE("failed to flush rules"); 819b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return -EREMOTEIO; 820b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 821b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 822b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return 0; 823b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran} 824b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran 825f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected 826f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// route, to the main table as well. 827f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// Returns 0 on success or negative errno on failure. 828eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram RamachandranWARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination, 829eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, RouteController::TableType tableType) { 8305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table; 83138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran switch (tableType) { 83238b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran case RouteController::INTERFACE: { 83338b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran table = getRouteTableForInterface(interface); 8345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 8355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 8365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 83738b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 83838b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 83987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran case RouteController::LOCAL_NETWORK: { 84087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran table = ROUTE_TABLE_LOCAL_NETWORK; 84187475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran break; 84287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 8435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_NETWORK: { 8444acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_NETWORK; 84538b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 84638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_SYSTEM: { 8484acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_SYSTEM; 84938b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 85038b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 85138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 8529c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 853f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti int ret = modifyIpRoute(action, table, interface, destination, nexthop); 85464166e7666e3cc7f4b9c715f2b4e19d28ae44c5aSreeram Ramachandran // Trying to add a route that already exists shouldn't cause an error. 85564166e7666e3cc7f4b9c715f2b4e19d28ae44c5aSreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { 856f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 857c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 858c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 859f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return 0; 8609c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 8619c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 862f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 863f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int flushRoutes(const char* interface) { 86492b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 8655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 866f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ESRCH; 86792b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 86892b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 869357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti char tableString[UINT32_STRLEN]; 870357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti snprintf(tableString, sizeof(tableString), "%u", table); 871357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 87299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int ret = 0; 873f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 874357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti const char* argv[] = { 875357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti IP_PATH, 876f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran IP_VERSIONS[i], 87772999d6cfc1df23cd911b85730f1f532fb62bed4Sreeram Ramachandran "route", 878357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "flush", 879357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "table", 880357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti tableString, 881357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti }; 88299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 88399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // A flush works by dumping routes and deleting each route as it's returned, and it can 88499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // fail if something else deletes the route between the dump and the delete. This can 88599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // happen, for example, if an interface goes down while we're trying to flush its routes. 88699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // So try multiple times and only return an error if the last attempt fails. 88799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // 88899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // TODO: replace this with our own netlink code. 88999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti unsigned attempts = 0; 89099286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti int err; 89199286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti do { 89299286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti err = android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), 89399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti NULL, false, false); 89499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ++attempts; 89599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } while (err != 0 && attempts < ROUTE_FLUSH_ATTEMPTS); 89699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (err) { 89799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ALOGE("failed to flush %s routes in table %s after %d attempts", 89899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti IP_VERSIONS[i], tableString, attempts); 89999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti ret = -EREMOTEIO; 900357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 901357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 902357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 90399286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // If we failed to flush routes, the caller may elect to keep this interface around, so keep 90499286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti // track of its name. 90599286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti if (!ret) { 90699286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti interfaceToTable.erase(interface); 90799286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti } 90899286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti 90999286fe1ef6fc325c28dd10b651b5adedd549495Lorenzo Colitti return ret; 91092b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 91192b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 9125c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} // namespace 9135c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 91487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::Init(unsigned localNetId) { 915b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran if (int ret = flushRules()) { 916b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 917b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran } 91887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran if (int ret = addLegacyRouteRules()) { 919f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 920f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 921fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addLocalNetworkRules(localNetId)) { 922b717e74df3571951890cf36ee8bd559501d7fdc4Sreeram Ramachandran return ret; 923f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 924a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti if (int ret = addDirectlyConnectedRule()) { 925a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti return ret; 926a2c230520be5fdafce8bbc0b6ee52262f981f75aLorenzo Colitti } 927fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran if (int ret = addUnreachableRule()) { 92887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return ret; 92987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran } 9303667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti // Don't complain if we can't add the dummy network, since not all devices support it. 9313667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti configureDummyNetwork(); 9323667936aadcabddc708797ac38ce1ffb2f992cb3Lorenzo Colitti 9334acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 934f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 9358fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 9368fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 9376a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { 93887475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_ADD); 9396a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9406a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9416a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { 94287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran return modifyLocalNetwork(netId, interface, ACTION_DEL); 9436a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 9446a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 9455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 9465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9474acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { 9484acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9494acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9504acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9514acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9525c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 9535c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 9545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 9555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 9565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 957f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 958f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 9594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 9604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9614acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9624acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9634acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 964379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 965379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 9665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 96795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 96895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 9694acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 9704acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9714acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9724acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9734acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9744043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 9754043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 9765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 97795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 97895684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 9795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 9804043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return ret; 9814043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 9824acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 9834acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 9844acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 9854acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 9864acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 9874043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 9884043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 9895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 9905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission oldPermission, 9915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission newPermission) { 992379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 9935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 994f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 995f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 9965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 997b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 998b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 99995684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandranint RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure, 10005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 100195684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 10025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 1003b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 1004b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 10055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 100695684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran bool secure, const UidRanges& uidRanges) { 100795684ba176a9fe5ea59207d7202e47fa12bbfdbeSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 10085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 10099c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10109c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 10125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 10139c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 10149c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 10155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 10165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 10175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 10185c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 10197619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1020f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 1021eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran TableType tableType) { 1022eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 10237619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 10247619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1025f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colittiint RouteController::removeRoute(const char* interface, const char* destination, 1026eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, TableType tableType) { 1027eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 10287619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 102987475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 103087475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { 1031fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface); 103287475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 103387475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran 103487475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandranint RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { 1035fa9f4dcd79dcfd24af276263159c5315abb06df6Sreeram Ramachandran return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface); 103687475a1471373b72ffc9f81f17dfd7884723fa86Sreeram Ramachandran} 103748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 103848e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface, 103948e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 104048e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission); 104148e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 104248e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran 104348e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandranint RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId, 104448e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran const char* physicalInterface, 104548e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran Permission permission) { 104648e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission); 104748e19b037e7e20674048ef76bf31ce65c741347cSreeram Ramachandran} 1048