RouteController.cpp revision 6a773534e7f8541f221f27fb8063af079b1a5936
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" 21f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 22f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#define LOG_TAG "Netd" 23f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "log/log.h" 24f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran#include "logwrap/logwrap.h" 255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran#include "resolv_netid.h" 265c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 27ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti#include <arpa/inet.h> 284acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran#include <fcntl.h> 294753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti#include <linux/fib_rules.h> 30a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen#include <map> 315c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include <net/if.h> 324acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran#include <sys/stat.h> 335c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 345c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandrannamespace { 355c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 36f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// BEGIN CONSTANTS -------------------------------------------------------------------------------- 37f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000; 395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// const uint32_t RULE_PRIORITY_VPN_OVERRIDE_LOCAL = 11000; 405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_SECURE_VPN = 12000; 415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; 425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; 435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; 445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; 456a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranconst uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; 465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// const uint32_t RULE_PRIORITY_TETHERING = 18000; 475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000; 485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// const uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000; 495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// const uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000; 505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; 515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000; 525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_UNREACHABLE = 24000; 535c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 544acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98; 554acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99; 564acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 574acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network"; 584acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system"; 594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 605965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not 615965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make 625965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert 635965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// that will warn us if upstream has given these values some other meaning. 645965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_START = 18; 655965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_END = 19; 665965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colittistatic_assert(FRA_UID_START > FRA_MAX, 675965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. " 685965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Check that these values match what the kernel does and then update this assertion."); 695965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 7072723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK; 7172723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL; 724753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 73f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0}; 74f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 75f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; 76f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 77f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst char* const IP_VERSIONS[] = {"-4", "-6"}; 78f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uid_t UID_ROOT = 0; 805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst char* const OIF_NONE = NULL; 815009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_ADD = true; 825009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_DEL = false; 835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool MODIFY_NON_UID_BASED_RULES = true; 845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 854acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranconst char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 86c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst int RT_TABLES_FLAGS = O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW | O_CLOEXEC; 87c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandranconst mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r-- 884acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 89f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" 90f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). 91f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconstexpr uint16_t U16_RTA_LENGTH(uint16_t x) { 92f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return RTA_LENGTH(x); 93f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran} 94f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 95f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// These are practically const, but can't be declared so, because they are used to initialize 96f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// non-const pointers ("void* iov_base") in iovec arrays. 97f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; 98f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; 99f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; 100f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; 101f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START }; 102f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END }; 103f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 104f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; 105f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; 106f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 107f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranuint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; 108f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 109f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// END CONSTANTS ---------------------------------------------------------------------------------- 110f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 1114acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// No locks needed because RouteController is accessed only from one thread (in CommandListener). 1124acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranstd::map<std::string, uint32_t> interfaceToTable; 113a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen 1145c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranuint32_t getRouteTableForInterface(const char* interface) { 115a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran uint32_t index = if_nametoindex(interface); 116a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen if (index) { 1174acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; 1184acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran interfaceToTable[interface] = index; 1194acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return index; 1204acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1214acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // If the interface goes away if_nametoindex() will return 0 but we still need to know 1224acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // the index so we can remove the rules and routes. 1234acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran auto iter = interfaceToTable.find(interface); 1244acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (iter == interfaceToTable.end()) { 1254acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 1264acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return RT_TABLE_UNSPEC; 1274acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1284acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return iter->second; 1294acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1304acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1314acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid addTableName(uint32_t table, const std::string& name, std::string* contents) { 1324acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran char tableString[UINT32_STRLEN]; 1334acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran snprintf(tableString, sizeof(tableString), "%u", table); 1344acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += tableString; 1354acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += " "; 1364acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += name; 1374acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran *contents += "\n"; 1384acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran} 1394acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 1404acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran// Doesn't return success/failure as the file is optional; it's okay if we fail to update it. 1414acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandranvoid updateTableNamesFile() { 1424acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran std::string contents; 1434acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); 1444acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); 1454acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran for (const auto& entry : interfaceToTable) { 1464acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran addTableName(entry.second, entry.first, &contents); 1474acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1484acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran 149c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran int fd = open(RT_TABLES_PATH, RT_TABLES_FLAGS, RT_TABLES_MODE); 1504acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (fd == -1) { 1514acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("failed to create %s (%s)", RT_TABLES_PATH, strerror(errno)); 1524acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return; 153a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen } 1544acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran // File creation is affected by umask, so make sure the right mode bits are set. 155c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran if (fchmod(fd, RT_TABLES_MODE) == -1) { 156c7d804c1d22db40ac79fde46a032cd359e975f5bSreeram Ramachandran ALOGE("failed to set mode 0%o on %s (%s)", RT_TABLES_MODE, RT_TABLES_PATH, strerror(errno)); 1574acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1584acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ssize_t bytesWritten = write(fd, contents.data(), contents.size()); 1594acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (bytesWritten != static_cast<ssize_t>(contents.size())) { 1604acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ALOGE("failed to write to %s (%zd vs %zu bytes) (%s)", RT_TABLES_PATH, bytesWritten, 1614acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran contents.size(), strerror(errno)); 1624acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 1634acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran close(fd); 1645c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 1655c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1664753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Sends a netlink request and expects an ack. 1674753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// |iov| is an array of struct iovec that contains the netlink message payload. 1684753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// The netlink header is generated by this function based on |action| and |flags|. 1694753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Returns -errno if there was an error or if the kernel reported an error. 170f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) { 1714753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr nlmsg = { 1724753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_type = action, 1734753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_flags = flags, 1744753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 1754753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_base = &nlmsg; 1764753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_len = sizeof(nlmsg); 1774753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti for (int i = 0; i < iovlen; ++i) { 1784753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsg.nlmsg_len += iov[i].iov_len; 1794753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1804753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1814753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int ret; 1824753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti struct { 1834753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr msg; 1844753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsgerr err; 1854753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } response; 1864753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1874753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE); 1884753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1 && 189f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS), 190f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran sizeof(NETLINK_ADDRESS)) != -1 && 1914753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti writev(sock, iov, iovlen) != -1 && 1924753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti (ret = recv(sock, &response, sizeof(response), 0)) != -1) { 1934753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (ret == sizeof(response)) { 1944753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = response.err.error; // Netlink errors are negative errno. 195f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret) { 196f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink response contains error (%s)", strerror(-ret)); 197f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 1984753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 1991201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response)); 2004753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -EBADMSG; 2014753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2024753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 203f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno)); 2044753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -errno; 2054753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2064753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2074753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1) { 2084753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti close(sock); 2094753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2104753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2114753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return ret; 2124753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti} 2134753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 2148fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 2158fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 2168fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the rule 2178fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// returns ENETUNREACH. 2188fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 2198fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 2208fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |interface| is non-NULL, the rule matches the specified outgoing interface. 22196f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// 22296f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// Returns 0 on success or negative errno on failure. 223f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 224f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint32_t fwmark, uint32_t mask, const char* interface, 225f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uid_t uidStart, uid_t uidEnd) { 226f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 227f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (fwmark & ~mask) { 228f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 229f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ERANGE; 230f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 231f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 2324753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // The interface name must include exactly one terminating NULL and be properly padded, or older 2334753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // kernels will refuse to delete rules. 2344753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti uint16_t paddingLength = 0; 2354753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti size_t interfaceLength = 0; 2364753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti char oifname[IFNAMSIZ]; 2375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (interface != OIF_NONE) { 2384753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti interfaceLength = strlcpy(oifname, interface, IFNAMSIZ) + 1; 2394753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (interfaceLength > IFNAMSIZ) { 240cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("interface name too long (%zu > %u)", interfaceLength, IFNAMSIZ); 2414753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return -ENAMETOOLONG; 2424753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2434753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti paddingLength = RTA_SPACE(interfaceLength) - RTA_LENGTH(interfaceLength); 2444753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 2457619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 2465965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti // Either both start and end UID must be specified, or neither. 247f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 248cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 2495965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti return -EUSERS; 2505965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti } 25172723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti bool isUidRule = (uidStart != INVALID_UID); 2525965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 2534753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rule request and put it in an array of iovec structures. 2544753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti fib_rule_hdr rule = { 2555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran .action = static_cast<uint8_t>(table != RT_TABLE_UNSPEC ? FR_ACT_TO_TBL : 2565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran FR_ACT_UNREACHABLE), 2574753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 258a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 259f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr fraOifname = { U16_RTA_LENGTH(interfaceLength), FRA_OIFNAME }; 260a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 2614753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iovec iov[] = { 262f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 263f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rule, sizeof(rule) }, 264f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 265f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &priority, sizeof(priority) }, 2665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 2675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 268f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 269f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &fwmark, mask ? sizeof(fwmark) : 0 }, 270f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 271f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &mask, mask ? sizeof(mask) : 0 }, 272f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 }, 273f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidStart, isUidRule ? sizeof(uidStart) : 0 }, 274f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 }, 275f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 }, 2765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &fraOifname, interface != OIF_NONE ? sizeof(fraOifname) : 0 }, 277f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { oifname, interfaceLength }, 278f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { PADDING_BUFFER, paddingLength }, 2794753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 2804753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 28172723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; 282f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 283f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rule.family = AF_FAMILIES[i]; 284f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) { 28596f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return ret; 2865c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 2875c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 2885c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 28996f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return 0; 2905c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 2915c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 292ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Adds or deletes an IPv4 or IPv6 route. 293ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Returns 0 on success or negative errno on failure. 294f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 295f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran const char* destination, const char* nexthop) { 296ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // At least the destination must be non-null. 297ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!destination) { 298f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("null destination"); 299ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EFAULT; 300ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 301ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 302ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // Parse the prefix. 303ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawAddress[sizeof(in6_addr)]; 304f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t family; 305f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t prefixLength; 306ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 307ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti &prefixLength); 308ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (rawLength < 0) { 309f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 310ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return rawLength; 311ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 3127619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 313ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 3141201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 315ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 316ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 317ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 318ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // If an interface was specified, find the ifindex. 319ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint32_t ifindex; 3205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (interface != OIF_NONE) { 321ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti ifindex = if_nametoindex(interface); 322ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!ifindex) { 323f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 324ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENODEV; 3257619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 3267619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 3277619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 328ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // If a nexthop was specified, parse it as the same family as the prefix. 329ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawNexthop[sizeof(in6_addr)]; 330f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 331f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("inet_pton failed for nexthop %s", nexthop); 332ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EINVAL; 333ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 334ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 3354753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rtmsg and put it in an array of iovec structures. 336f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtmsg route = { 337ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_protocol = RTPROT_STATIC, 338ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_type = RTN_UNICAST, 339ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_family = family, 340ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_dst_len = prefixLength, 341ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 3424753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 343f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 344f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 345ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 346ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti iovec iov[] = { 347f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 348f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &route, sizeof(route) }, 349f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 350f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &table, sizeof(table) }, 351f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaDst, sizeof(rtaDst) }, 352f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawAddress, static_cast<size_t>(rawLength) }, 3535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 3545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 355f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 356f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 357ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 358ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 359f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : 360f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran NETLINK_REQUEST_FLAGS; 3614753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov)); 3627619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 3637619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 3645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Add rules to allow legacy routes added through the requestRouteToHost() API. 3655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int AddLegacyRouteRules() { 3665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 3675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 3685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 3705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 3715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran // Rules to allow legacy routes to override the default network. 3734acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 3744acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, 3754acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran INVALID_UID)) { 3765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 3775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 3785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 3794acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, 3805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID)) { 3815009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 3825009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 3835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 3855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 3865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran // A rule to allow legacy routes from system apps to override VPNs. 3884acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 3894acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID); 3905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 3915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Add a new rule to look up the 'main' table, with the same selectors as the "default network" 3935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// rule, but with a lower priority. Since the default network rule points to a table with a default 3945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// route, the rule we're adding will never be used for normal routing lookups. However, the kernel 3955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// may fall-through to it to find directly-connected routes when it validates that a nexthop (in a 3965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// route being added) is reachable. 3975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int AddDirectlyConnectedRule() { 3985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 3995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 4005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 4025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 4035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN, 4055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, UID_ROOT, UID_ROOT); 4065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 4075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Add a rule to preempt the pre-defined "from all lookup main" rule. Packets that reach this rule 4095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// will be null-routed, and won't fall-through to the main table. 4105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int AddUnreachableRule() { 4115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET, 4125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MARK_UNSET, OIF_NONE, INVALID_UID, INVALID_UID); 4135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 4145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// An iptables rule to mark incoming packets on a network with the netId of the network. 4165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is so that the kernel can: 4185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 4195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// replies, SYN-ACKs, etc). 4205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Mark sockets that accept connections from this interface so that the connection stays on the 4215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// same interface. 4225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 4235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 4275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = true; 4295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 431b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran char markString[UINT32_HEX_STRLEN]; 4325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue); 4335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 434b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j", 435b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran "MARK", "--set-mark", markString, NULL)) { 436b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran ALOGE("failed to change iptables rule that sets incoming packet mark"); 437b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return -EREMOTEIO; 438b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 4395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 440b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 441b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 442b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 4435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on an explicitly chosen network. 4445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 4465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 4485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// to check it again in the rules here, because a network's permissions may have been updated via 4495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// modifyNetworkPermission(). 4505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 4515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 4525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 453eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark fwmark; 454eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark mask; 455eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 456eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran fwmark.netId = netId; 457eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 458eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 4595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 461eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 4625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 4645c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 4655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 4665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, uidStart, uidEnd); 4675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 4685c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 4695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on a chosen outgoing interface. 4705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 4725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// the outgoing interface (typically for link-local communications). 4735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyOutputInterfaceRule(const char* interface, uint32_t table, 4745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 4755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 476122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 477122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 4785c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 479f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 480f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran mask.permission = permission; 4815c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 4825009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 4835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.intValue, mask.intValue, interface, uidStart, uidEnd); 4845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 4855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on the chosen network. 4875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is for sockets that have not explicitly requested a particular network, but have been 4895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bound to one when they called connect(). This ensures that sockets connected on a particular 4905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// network stay on that network even if the default network changes. 4915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, 4925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 4955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 496122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 497122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 498122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 4995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 500122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 5015c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 5035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 504eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 5065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID); 5075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5085c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route all traffic from a given set of UIDs to go over the VPN. 5105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 5125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 5135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bypass the VPN if the protectedFromVpn bit is set. 5145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 5155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran bool add) { 5165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = false; 5205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.protectedFromVpn = true; 5215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_SECURE_VPN, table, 5235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, uidStart, uidEnd); 5245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 5275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// set of UIDs. 5285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 5295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 5305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// target set, but where the DnsProxyListener itself is not. 5315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool add) { 5325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 5335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 5345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 5365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 5375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 5395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 5405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 5415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_SECURE_VPN, table, 5425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID); 5435c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 5445c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 5456a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran// A rule to allow local network routes to override the default network. 5466a773534e7f8541f221f27fb8063af079b1a5936Sreeram RamachandranWARN_UNUSED_RESULT int modifyLocalOverrideRule(uint32_t table, bool add) { 5476a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran Fwmark fwmark; 5486a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran Fwmark mask; 5496a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 5506a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran fwmark.explicitlySelected = false; 5516a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran mask.explicitlySelected = true; 5526a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 5536a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_LOCAL_NETWORK, table, 5546a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID); 5556a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 5566a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 5576a773534e7f8541f221f27fb8063af079b1a5936Sreeram RamachandranWARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { 5586a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 5596a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 5606a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return -ESRCH; 5616a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 5626a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 5636a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 5646a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 5656a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 5666a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, INVALID_UID, INVALID_UID, 5676a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran add)) { 5686a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 5696a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 5706a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, PERMISSION_NONE, INVALID_UID, 5716a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran INVALID_UID, add)) { 5726a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 5736a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 5746a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return modifyLocalOverrideRule(table, add); 5756a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 5766a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 5775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface, 5785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 5794043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 5805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 5814043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return -ESRCH; 5824043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 5834043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 5845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 5855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 5865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 5875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 5885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 5895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 5905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 5915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, permission, INVALID_UID, INVALID_UID, 5925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 5935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 5945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 5955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyImplicitNetworkRule(netId, table, permission, add); 5965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5974043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 5985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface, 5995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges, bool add, 6005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran bool modifyNonUidBasedRules) { 6015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 6025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 6035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 6045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 605b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 606e09b20aee85f1dfd8c18c3d8581ac875d939ba70Sreeram Ramachandran for (const UidRanges::Range& range : uidRanges.getRanges()) { 6075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first, 6085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 609b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 610b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 6115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, PERMISSION_NONE, range.first, 6125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 613b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 614b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 6155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, add)) { 616eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return ret; 617eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran } 6185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 619eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 6205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (modifyNonUidBasedRules) { 6215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 622b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 623b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 6245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, 6255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 626b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 627b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 6285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyVpnSystemPermissionRule(netId, table, add); 629b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 6304043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 631b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 6324043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 6334043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 6345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface, 6355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 6369c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 6375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 63896f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return -ESRCH; 6399c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 6409c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 641122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 642122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 643f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 6445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 645122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 646f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 647f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 648122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 6499c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 6505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 6515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID); 6527619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 6537619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 654f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected 655f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// route, to the main table as well. 656f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// Returns 0 on success or negative errno on failure. 657eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram RamachandranWARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination, 658eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, RouteController::TableType tableType) { 6595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table; 66038b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran switch (tableType) { 66138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran case RouteController::INTERFACE: { 66238b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran table = getRouteTableForInterface(interface); 6635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 6645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 6655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 66638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 66738b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 6685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_NETWORK: { 6694acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_NETWORK; 67038b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 67138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 6725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_SYSTEM: { 6734acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran table = ROUTE_TABLE_LEGACY_SYSTEM; 67438b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 67538b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 67638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 6779c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 678f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti int ret = modifyIpRoute(action, table, interface, destination, nexthop); 6791077d298655efa7755925e788d49a73e9db10afcSreeram Ramachandran // We allow apps to call requestRouteToHost() multiple times with the same route, so ignore 6801077d298655efa7755925e788d49a73e9db10afcSreeram Ramachandran // EEXIST failures when adding routes to legacy tables. 6815009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST && 6825009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran tableType != RouteController::INTERFACE)) { 683f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 684c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 685c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 686c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran // If there's no nexthop, this is a directly connected route. Add it to the main table also, to 687f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti // let the kernel find it when validating nexthops when global routes are added. 688f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti if (!nexthop) { 689f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti ret = modifyIpRoute(action, RT_TABLE_MAIN, interface, destination, NULL); 690f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti // A failure with action == ADD && errno == EEXIST means that the route already exists in 691f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti // the main table, perhaps because the kernel added it automatically as part of adding the 692f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti // IP address to the interface. Ignore this, but complain about everything else. 693f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { 694f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 695f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti } 696c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 697c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 698f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return 0; 6999c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 7009c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 701f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 702f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int flushRoutes(const char* interface) { 70392b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 7045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 705f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ESRCH; 70692b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 70792b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 708357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti char tableString[UINT32_STRLEN]; 709357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti snprintf(tableString, sizeof(tableString), "%u", table); 710357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 711f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 712357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti const char* argv[] = { 713357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti IP_PATH, 714f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran IP_VERSIONS[i], 71572999d6cfc1df23cd911b85730f1f532fb62bed4Sreeram Ramachandran "route", 716357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "flush", 717357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "table", 718357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti tableString, 719357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti }; 720f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { 721f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("failed to flush routes"); 722f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -EREMOTEIO; 723357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 724357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 725357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 7264acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran interfaceToTable.erase(interface); 727f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 72892b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 72992b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 7305c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} // namespace 7315c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 732f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::Init() { 7335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = AddDirectlyConnectedRule()) { 734f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 735f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 7365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = AddLegacyRouteRules()) { 737f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 738f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 7395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran // TODO: Enable once we are sure everything works. 7405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (false) { 7414acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = AddUnreachableRule()) { 7424acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 7434acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 744f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 7454acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 746f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 7478fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 7488fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 7496a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { 7506a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyLocalNetwork(netId, interface, ACTION_ADD)) { 7516a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 7526a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 7536a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran updateTableNamesFile(); 7546a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return 0; 7556a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 7566a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 7576a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandranint RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { 7586a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = modifyLocalNetwork(netId, interface, ACTION_DEL)) { 7596a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 7606a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 7616a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 7626a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return ret; 7636a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran } 7646a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran updateTableNamesFile(); 7656a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran return 0; 7666a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran} 7676a773534e7f8541f221f27fb8063af079b1a5936Sreeram Ramachandran 7685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 7695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 7704acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { 7714acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 7724acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 7734acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 7744acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 7755c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 7765c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 7775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 7785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 7795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 780f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 781f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 7824acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 7834acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 7844acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 7854acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 7864acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 787379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 788379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 7895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 7905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 7914acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, ACTION_ADD, 7924acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 7934acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 7944acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 7954acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 7964acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 7974043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 7984043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 7995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 8005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 8015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, ACTION_DEL, 8025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 8034043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return ret; 8044043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 8054acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran if (int ret = flushRoutes(interface)) { 8064acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return ret; 8074acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran } 8084acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran updateTableNamesFile(); 8094acd34a8e95b1191318216ebad409ec5e1b3d5f0Sreeram Ramachandran return 0; 8104043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 8114043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 8125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 8135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission oldPermission, 8145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission newPermission) { 815379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 8165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 817f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 818f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 8195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 820b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 821b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 8225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, 8235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 8245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, ACTION_ADD, 8255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 826b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 827b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 8285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 8295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 8305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, ACTION_DEL, 8315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 8329c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 8339c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 8345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 8355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 8369c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 8379c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 8385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 8395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 8405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 8415c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 8427619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 843f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 844eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran TableType tableType) { 845eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 8467619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 8477619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 848f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colittiint RouteController::removeRoute(const char* interface, const char* destination, 849eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, TableType tableType) { 850eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 8517619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 852