RouteController.cpp revision 5009d5ef3fbcdc69d772b528fd22184b7d605afa
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> 284753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti#include <linux/fib_rules.h> 29a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen#include <map> 305c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran#include <net/if.h> 315c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 325c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandrannamespace { 335c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 34f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// BEGIN CONSTANTS -------------------------------------------------------------------------------- 35f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000; 375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// const uint32_t RULE_PRIORITY_VPN_OVERRIDE_LOCAL = 11000; 385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_SECURE_VPN = 12000; 395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; 405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; 415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; 425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; 435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// const uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; 445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// const uint32_t RULE_PRIORITY_TETHERING = 18000; 455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000; 465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// const uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000; 475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// const uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000; 485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; 495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000; 505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uint32_t RULE_PRIORITY_UNREACHABLE = 24000; 515c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 525965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not 535965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make 545965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert 555965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti// that will warn us if upstream has given these values some other meaning. 565965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_START = 18; 575965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitticonst uint16_t FRA_UID_END = 19; 585965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colittistatic_assert(FRA_UID_START > FRA_MAX, 595965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. " 605965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti "Check that these values match what the kernel does and then update this assertion."); 615965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 6272723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK; 6372723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitticonst uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL; 644753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 65f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0}; 66f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 67f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; 68f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 69f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconst char* const IP_VERSIONS[] = {"-4", "-6"}; 70f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst uid_t UID_ROOT = 0; 725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst char* const OIF_NONE = NULL; 735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_ADD = true; 745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool ACTION_DEL = false; 755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranconst bool MODIFY_NON_UID_BASED_RULES = true; 765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 77f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" 78f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). 79f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranconstexpr uint16_t U16_RTA_LENGTH(uint16_t x) { 80f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return RTA_LENGTH(x); 81f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran} 82f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 83f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// These are practically const, but can't be declared so, because they are used to initialize 84f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// non-const pointers ("void* iov_base") in iovec arrays. 85f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; 86f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; 87f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; 88f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; 89f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START }; 90f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END }; 91f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 92f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; 93f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranrtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; 94f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 95f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranuint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; 96f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 97f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// END CONSTANTS ---------------------------------------------------------------------------------- 98f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 99a561e121c724e9163b2e256e15eef660e3a326daPaul Jensenstd::map<std::string, uint32_t> interfaceToIndex; 100a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen 1015c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandranuint32_t getRouteTableForInterface(const char* interface) { 102a48118062412f16ae712bfc8c8a539d3b6a85e47Sreeram Ramachandran uint32_t index = if_nametoindex(interface); 103a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen if (index) { 104a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen interfaceToIndex[interface] = index; 105a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen } else { 106a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen // If the interface goes away if_nametoindex() will return 0 but we still need to know 107a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen // the index so we can remove the rules and routes. 1085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran auto iter = interfaceToIndex.find(interface); 1095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (iter == interfaceToIndex.end()) { 1105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran ALOGE("cannot find interface %s", interface); 1115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return RT_TABLE_UNSPEC; 112f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 1135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran index = iter->second; 114a561e121c724e9163b2e256e15eef660e3a326daPaul Jensen } 1155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return index + RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; 1165c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 1175c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 1184753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Sends a netlink request and expects an ack. 1194753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// |iov| is an array of struct iovec that contains the netlink message payload. 1204753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// The netlink header is generated by this function based on |action| and |flags|. 1214753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti// Returns -errno if there was an error or if the kernel reported an error. 122f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) { 1234753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr nlmsg = { 1244753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_type = action, 1254753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti .nlmsg_flags = flags, 1264753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 1274753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_base = &nlmsg; 1284753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iov[0].iov_len = sizeof(nlmsg); 1294753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti for (int i = 0; i < iovlen; ++i) { 1304753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsg.nlmsg_len += iov[i].iov_len; 1314753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1324753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1334753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int ret; 1344753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti struct { 1354753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsghdr msg; 1364753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti nlmsgerr err; 1374753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } response; 1384753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1394753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti int sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE); 1404753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1 && 141f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS), 142f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran sizeof(NETLINK_ADDRESS)) != -1 && 1434753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti writev(sock, iov, iovlen) != -1 && 1444753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti (ret = recv(sock, &response, sizeof(response), 0)) != -1) { 1454753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (ret == sizeof(response)) { 1464753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = response.err.error; // Netlink errors are negative errno. 147f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret) { 148f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink response contains error (%s)", strerror(-ret)); 149f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 1504753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 1511201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response)); 1524753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -EBADMSG; 1534753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1544753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } else { 155f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno)); 1564753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti ret = -errno; 1574753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1584753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1594753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (sock != -1) { 1604753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti close(sock); 1614753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1624753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1634753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return ret; 1644753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti} 1654753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 1668fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// Adds or removes a routing rule for IPv4 and IPv6. 1678fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// 1688fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the rule 1698fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// returns ENETUNREACH. 1708fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 1718fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// ignored. 1728fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran// + If |interface| is non-NULL, the rule matches the specified outgoing interface. 17396f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// 17496f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti// Returns 0 on success or negative errno on failure. 175f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 176f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint32_t fwmark, uint32_t mask, const char* interface, 177f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uid_t uidStart, uid_t uidEnd) { 178f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 179f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (fwmark & ~mask) { 180f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 181f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ERANGE; 182f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 183f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 1844753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // The interface name must include exactly one terminating NULL and be properly padded, or older 1854753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // kernels will refuse to delete rules. 1864753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti uint16_t paddingLength = 0; 1874753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti size_t interfaceLength = 0; 1884753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti char oifname[IFNAMSIZ]; 1895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (interface != OIF_NONE) { 1904753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti interfaceLength = strlcpy(oifname, interface, IFNAMSIZ) + 1; 1914753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti if (interfaceLength > IFNAMSIZ) { 192cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("interface name too long (%zu > %u)", interfaceLength, IFNAMSIZ); 1934753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return -ENAMETOOLONG; 1944753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1954753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti paddingLength = RTA_SPACE(interfaceLength) - RTA_LENGTH(interfaceLength); 1964753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti } 1977619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 1985965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti // Either both start and end UID must be specified, or neither. 199f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 200cf891383224e420d99996f7e63728a7cc902415eSreeram Ramachandran ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 2015965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti return -EUSERS; 2025965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti } 20372723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti bool isUidRule = (uidStart != INVALID_UID); 2045965651602fb8373b75b6ae2d59c6a4d753f2f49Lorenzo Colitti 2054753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rule request and put it in an array of iovec structures. 2064753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti fib_rule_hdr rule = { 2075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran .action = static_cast<uint8_t>(table != RT_TABLE_UNSPEC ? FR_ACT_TO_TBL : 2085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran FR_ACT_UNREACHABLE), 2094753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 210a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 211f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr fraOifname = { U16_RTA_LENGTH(interfaceLength), FRA_OIFNAME }; 212a10ac3214f6a582b7fdb66acc43c702731e53d81Lorenzo Colitti 2134753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti iovec iov[] = { 214f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 215f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rule, sizeof(rule) }, 216f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 217f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &priority, sizeof(priority) }, 2185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 2195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 220f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 221f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &fwmark, mask ? sizeof(fwmark) : 0 }, 222f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 223f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &mask, mask ? sizeof(mask) : 0 }, 224f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 }, 225f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidStart, isUidRule ? sizeof(uidStart) : 0 }, 226f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 }, 227f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 }, 2285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &fraOifname, interface != OIF_NONE ? sizeof(fraOifname) : 0 }, 229f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { oifname, interfaceLength }, 230f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { PADDING_BUFFER, paddingLength }, 2314753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti }; 2324753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 23372723683be57b6d562dc96cde30cc33cc96b3e82Lorenzo Colitti uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; 234f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 235f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rule.family = AF_FAMILIES[i]; 236f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) { 23796f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return ret; 2385c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 2395c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran } 2405c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 24196f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return 0; 2425c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 2435c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 244ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Adds or deletes an IPv4 or IPv6 route. 245ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti// Returns 0 on success or negative errno on failure. 246f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 247f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran const char* destination, const char* nexthop) { 248ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // At least the destination must be non-null. 249ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!destination) { 250f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("null destination"); 251ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EFAULT; 252ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 253ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 254ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // Parse the prefix. 255ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawAddress[sizeof(in6_addr)]; 256f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t family; 257f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint8_t prefixLength; 258ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 259ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti &prefixLength); 260ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (rawLength < 0) { 261f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 262ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return rawLength; 263ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 2647619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 265ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 2661201e84ebda52d8d82e5385644e9de0923e61aa3Sreeram Ramachandran ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 267ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 268ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 269ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 270ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // If an interface was specified, find the ifindex. 271ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint32_t ifindex; 2725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (interface != OIF_NONE) { 273ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti ifindex = if_nametoindex(interface); 274ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti if (!ifindex) { 275f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("cannot find interface %s", interface); 276ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -ENODEV; 2777619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 2787619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran } 2797619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 280ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti // If a nexthop was specified, parse it as the same family as the prefix. 281ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti uint8_t rawNexthop[sizeof(in6_addr)]; 282f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 283f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("inet_pton failed for nexthop %s", nexthop); 284ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti return -EINVAL; 285ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti } 286ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 2874753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti // Assemble a rtmsg and put it in an array of iovec structures. 288f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtmsg route = { 289ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_protocol = RTPROT_STATIC, 290ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_type = RTN_UNICAST, 291ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_family = family, 292ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti .rtm_dst_len = prefixLength, 293ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 2944753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti 295f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 296f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 297ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 298ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti iovec iov[] = { 299f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { NULL, 0 }, 300f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &route, sizeof(route) }, 301f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 302f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &table, sizeof(table) }, 303f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaDst, sizeof(rtaDst) }, 304f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawAddress, static_cast<size_t>(rawLength) }, 3055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 3065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 307f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 308f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 309ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti }; 310ba25df989b48f36b784ad39307a49a4fd9c3fd66Lorenzo Colitti 311f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : 312f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran NETLINK_REQUEST_FLAGS; 3134753afd79e130d5f1c888f549c36b4da92dbe680Lorenzo Colitti return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov)); 3147619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 3157619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 3165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Add rules to allow legacy routes added through the requestRouteToHost() API. 3175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int AddLegacyRouteRules() { 3185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 3195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 3205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 3225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 3235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran // Rules to allow legacy routes to override the default network. 3255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, 3265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran RouteController::ROUTE_TABLE_LEGACY_SYSTEM, fwmark.intValue, 3275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID)) { 3285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 3295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 3305009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 3315009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran RouteController::ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, 3325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID)) { 3335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 3345009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 3355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 3375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 3385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran // A rule to allow legacy routes from system apps to override VPNs. 3405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, 3415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran RouteController::ROUTE_TABLE_LEGACY_SYSTEM, fwmark.intValue, mask.intValue, 3425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran OIF_NONE, INVALID_UID, INVALID_UID); 3435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 3445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Add a new rule to look up the 'main' table, with the same selectors as the "default network" 3465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// rule, but with a lower priority. Since the default network rule points to a table with a default 3475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// route, the rule we're adding will never be used for normal routing lookups. However, the kernel 3485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// may fall-through to it to find directly-connected routes when it validates that a nexthop (in a 3495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// route being added) is reachable. 3505009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int AddDirectlyConnectedRule() { 3515009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 3525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 3535009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 3555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 3565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3575009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN, 3585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, UID_ROOT, UID_ROOT); 3595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 3605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Add a rule to preempt the pre-defined "from all lookup main" rule. Packets that reach this rule 3625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// will be null-routed, and won't fall-through to the main table. 3635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int AddUnreachableRule() { 3645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET, 3655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MARK_UNSET, OIF_NONE, INVALID_UID, INVALID_UID); 3665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 3675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// An iptables rule to mark incoming packets on a network with the netId of the network. 3695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 3705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is so that the kernel can: 3715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 3725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// replies, SYN-ACKs, etc). 3735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// + Mark sockets that accept connections from this interface so that the connection stays on the 3745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// same interface. 3755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 3765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 3775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 3785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 3795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 3805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 3815009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = true; 3825009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 3835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 384b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran char markString[UINT32_HEX_STRLEN]; 3855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue); 3865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 387b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j", 388b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran "MARK", "--set-mark", markString, NULL)) { 389b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran ALOGE("failed to change iptables rule that sets incoming packet mark"); 390b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return -EREMOTEIO; 391b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 3925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 393b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 394b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 395b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 3965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on an explicitly chosen network. 3975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 3985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 3995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 4015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// to check it again in the rules here, because a network's permissions may have been updated via 4025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// modifyNetworkPermission(). 4035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 4045009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 4055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 406eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark fwmark; 407eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran Fwmark mask; 408eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 409eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran fwmark.netId = netId; 410eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 411eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 4125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = true; 4135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.explicitlySelected = true; 414eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 4155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 4175c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 4185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 4195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, uidStart, uidEnd); 4205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 4215c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 4225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on a chosen outgoing interface. 4235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 4255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// the outgoing interface (typically for link-local communications). 4265009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyOutputInterfaceRule(const char* interface, uint32_t table, 4275009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, uid_t uidStart, 4285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uid_t uidEnd, bool add) { 429122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 430122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 4315c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 432f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 433f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran mask.permission = permission; 4345c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 4355009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 4365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.intValue, mask.intValue, interface, uidStart, uidEnd); 4375009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 4385009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route traffic based on the chosen network. 4405009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is for sockets that have not explicitly requested a particular network, but have been 4425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bound to one when they called connect(). This ensures that sockets connected on a particular 4435009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// network stay on that network even if the default network changes. 4445009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, 4455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 4465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 4485009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 449122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran fwmark.netId = netId; 450122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 451122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran 4525009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.explicitlySelected = false; 453122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.explicitlySelected = true; 4545c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 4555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = permission; 4565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = permission; 457eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 4585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 4595009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID); 4605009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 4615c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 4625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to route all traffic from a given set of UIDs to go over the VPN. 4635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4645009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 4655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 4665009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// bypass the VPN if the protectedFromVpn bit is set. 4675009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 4685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran bool add) { 4695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 4715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.protectedFromVpn = false; 4735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.protectedFromVpn = true; 4745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_SECURE_VPN, table, 4765009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, uidStart, uidEnd); 4775009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 4785009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4795009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 4805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// set of UIDs. 4815009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// 4825009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 4835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran// target set, but where the DnsProxyListener itself is not. 4845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool add) { 4855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark fwmark; 4865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Fwmark mask; 4875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = netId; 4895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 4905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4915009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.permission = PERMISSION_SYSTEM; 4925009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.permission = PERMISSION_SYSTEM; 4935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran 4945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_SECURE_VPN, table, 4955009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID); 4965c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 4975c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 4985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface, 4995009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission, bool add) { 5004043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 5015009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 5024043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return -ESRCH; 5034043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 5044043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 5055009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 5065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 5075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 5085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 5095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 5105009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 5115009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 5125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, permission, INVALID_UID, INVALID_UID, 5135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 5145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return ret; 5155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 5165009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyImplicitNetworkRule(netId, table, permission, add); 5175009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran} 5184043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 5195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface, 5205009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges, bool add, 5215009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran bool modifyNonUidBasedRules) { 5225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 5235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 5245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 5255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 526b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 527b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran for (const std::pair<uid_t, uid_t>& range : uidRanges.getRanges()) { 5285009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first, 5295009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 530b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 531b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 5325009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyOutputInterfaceRule(interface, table, PERMISSION_NONE, range.first, 5335009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran range.second, add)) { 534b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 535b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 5365009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, add)) { 537eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return ret; 538eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran } 5395009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 540eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran 5415009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (modifyNonUidBasedRules) { 5425009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 543b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 544b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 5455009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, 5465009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran add)) { 547b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return ret; 548b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 5495009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyVpnSystemPermissionRule(netId, table, add); 550b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran } 5514043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 552b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran return 0; 5534043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 5544043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 5555009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram RamachandranWARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface, 5565009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 5579c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 5585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 55996f261e8b28048b8cb48f5a4e81822c73bb813f4Lorenzo Colitti return -ESRCH; 5609c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran } 5619c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 562122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark fwmark; 563122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran Fwmark mask; 564f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 5655009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran fwmark.netId = NETID_UNSET; 566122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.netId = FWMARK_NET_ID_MASK; 567f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran 568f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran fwmark.permission = permission; 569122f581eb16e06c70cbbc40bd40995775075151fSreeram Ramachandran mask.permission = permission; 5709c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 5715009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 5725009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID); 5737619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 5747619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 575f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected 576f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// route, to the main table as well. 577f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti// Returns 0 on success or negative errno on failure. 578eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram RamachandranWARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination, 579eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, RouteController::TableType tableType) { 5805009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran uint32_t table; 58138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran switch (tableType) { 58238b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran case RouteController::INTERFACE: { 58338b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran table = getRouteTableForInterface(interface); 5845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 5855009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return -ESRCH; 5865009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran } 58738b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 58838b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 5895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_NETWORK: { 5905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran table = RouteController::ROUTE_TABLE_LEGACY_NETWORK; 59138b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 59238b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 5935009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran case RouteController::LEGACY_SYSTEM: { 5945009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran table = RouteController::ROUTE_TABLE_LEGACY_SYSTEM; 59538b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran break; 59638b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 59738b7af1f2cb9579895465fabc37865f5dadcac25Sreeram Ramachandran } 5989c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 599f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti int ret = modifyIpRoute(action, table, interface, destination, nexthop); 6001077d298655efa7755925e788d49a73e9db10afcSreeram Ramachandran // We allow apps to call requestRouteToHost() multiple times with the same route, so ignore 6011077d298655efa7755925e788d49a73e9db10afcSreeram Ramachandran // EEXIST failures when adding routes to legacy tables. 6025009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST && 6035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran tableType != RouteController::INTERFACE)) { 604f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 605c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 606c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 607c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran // If there's no nexthop, this is a directly connected route. Add it to the main table also, to 608f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti // let the kernel find it when validating nexthops when global routes are added. 609f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti if (!nexthop) { 610f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti ret = modifyIpRoute(action, RT_TABLE_MAIN, interface, destination, NULL); 611f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti // A failure with action == ADD && errno == EEXIST means that the route already exists in 612f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti // the main table, perhaps because the kernel added it automatically as part of adding the 613f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti // IP address to the interface. Ignore this, but complain about everything else. 614f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { 615f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return ret; 616f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti } 617c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran } 618c92133732378aae815120c39edd62a7b4eb773b3Sreeram Ramachandran 619f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colitti return 0; 6209c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 6219c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 622f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran// Returns 0 on success or negative errno on failure. 623f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram RamachandranWARN_UNUSED_RESULT int flushRoutes(const char* interface) { 62492b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran uint32_t table = getRouteTableForInterface(interface); 6255009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (table == RT_TABLE_UNSPEC) { 626f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -ESRCH; 62792b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran } 62892b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 629357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti char tableString[UINT32_STRLEN]; 630357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti snprintf(tableString, sizeof(tableString), "%u", table); 631357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 632f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { 633357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti const char* argv[] = { 634357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti IP_PATH, 635f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran IP_VERSIONS[i], 63672999d6cfc1df23cd911b85730f1f532fb62bed4Sreeram Ramachandran "route", 637357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "flush", 638357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti "table", 639357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti tableString, 640357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti }; 641f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { 642f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran ALOGE("failed to flush routes"); 643f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return -EREMOTEIO; 644357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 645357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti } 646357e5629bb4c745296ab40340ec8679372337155Lorenzo Colitti 6475009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran interfaceToIndex.erase(interface); 648f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 64992b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran} 65092b66c4990b4a0ab608aa9c31da946f36085203bSreeram Ramachandran 6515c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} // namespace 6525c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 653f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::Init() { 6545009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = AddDirectlyConnectedRule()) { 655f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 656f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 6578fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 6585009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = AddLegacyRouteRules()) { 659f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 660f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 6615009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran // TODO: Enable once we are sure everything works. 6625009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (false) { 6635009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return AddUnreachableRule(); 664f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 665f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return 0; 6668fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran} 6678fe9c8e0a2b1c5cd2a34720efaccc641d9ab8fb6Sreeram Ramachandran 6685009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 6695009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 6705009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD); 6715c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 6725c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran 6735009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 6745009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 6755009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 676f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 677f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 67872999d6cfc1df23cd911b85730f1f532fb62bed4Sreeram Ramachandran return flushRoutes(interface); 679379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran} 680379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran 6815009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 6825009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 6835009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, ACTION_ADD, 6845009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES); 6854043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 6864043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 6875009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 6885009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 6895009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, ACTION_DEL, 6905009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran MODIFY_NON_UID_BASED_RULES)) { 6914043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran return ret; 6924043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran } 69372999d6cfc1df23cd911b85730f1f532fb62bed4Sreeram Ramachandran return flushRoutes(interface); 6944043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran} 6954043f01f8e25f24246efadc710ad7440aab75529Sreeram Ramachandran 6965009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 6975009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission oldPermission, 6985009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission newPermission) { 699379bd33f7640e2c4bef902be0ed6cb96378c8c2eSreeram Ramachandran // Add the new rules before deleting the old ones, to avoid race conditions. 7005009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 701f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran return ret; 702f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandran } 7035009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 704b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 705b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 7065009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, 7075009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 7085009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, ACTION_ADD, 7095009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 710b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran} 711b1425cc09f8a29350520db0d4f489331df5a689bSreeram Ramachandran 7125009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 7135009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran const UidRanges& uidRanges) { 7145009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyVirtualNetwork(netId, interface, uidRanges, ACTION_DEL, 7155009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran !MODIFY_NON_UID_BASED_RULES); 7169c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 7179c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 7185009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 7195009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 7209c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran} 7219c0d313de6a3157fadd3b52a9927c77216ca435eSreeram Ramachandran 7225009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandranint RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 7235009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran Permission permission) { 7245009d5ef3fbcdc69d772b528fd22184b7d605afaSreeram Ramachandran return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 7255c181bf8ca0c89bd9e3e6d8e40bac53d0ee7082fSreeram Ramachandran} 7267619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 727f4f6c8de3f091be4b91a5a9d7f14e8882ec6d502Sreeram Ramachandranint RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 728eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran TableType tableType) { 729eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 7307619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 7317619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran 732f7fc8eccb0a6a4fbca4cafdf53f5c167c8f1d755Lorenzo Colittiint RouteController::removeRoute(const char* interface, const char* destination, 733eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran const char* nexthop, TableType tableType) { 734eb27b7ec10faf47a93fbc2863092cc667b05e252Sreeram Ramachandran return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 7357619e1bbebdfe643c35ee6be4ac054f5255f0706Sreeram Ramachandran} 736