Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "RouteController.h" |
| 18 | |
Dan Albert | aa1be2b | 2015-01-06 09:36:17 -0800 | [diff] [blame] | 19 | #include <arpa/inet.h> |
| 20 | #include <errno.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <linux/fib_rules.h> |
| 23 | #include <net/if.h> |
| 24 | #include <sys/stat.h> |
| 25 | |
Elliott Hughes | bd37832 | 2015-02-04 13:25:14 -0800 | [diff] [blame] | 26 | #include <private/android_filesystem_config.h> |
| 27 | |
Dan Albert | aa1be2b | 2015-01-06 09:36:17 -0800 | [diff] [blame] | 28 | #include <map> |
| 29 | |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 30 | #include "Fwmark.h" |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 31 | #include "UidRanges.h" |
Lorenzo Colitti | 3667936 | 2015-02-25 10:26:19 +0900 | [diff] [blame] | 32 | #include "DummyNetwork.h" |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 33 | |
Elliott Hughes | bbd5626 | 2015-12-04 15:45:10 -0800 | [diff] [blame] | 34 | #include "android-base/file.h" |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 35 | #define LOG_TAG "Netd" |
| 36 | #include "log/log.h" |
| 37 | #include "logwrap/logwrap.h" |
Lorenzo Colitti | 3667936 | 2015-02-25 10:26:19 +0900 | [diff] [blame] | 38 | #include "netutils/ifc.h" |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 39 | #include "resolv_netid.h" |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 40 | |
Dan Albert | 5407e14 | 2015-03-16 10:05:59 -0700 | [diff] [blame] | 41 | using android::base::WriteStringToFile; |
| 42 | |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 43 | namespace { |
| 44 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 45 | // BEGIN CONSTANTS -------------------------------------------------------------------------------- |
| 46 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 47 | const uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000; |
Lorenzo Colitti | 57947f0 | 2015-02-27 16:45:55 +0900 | [diff] [blame] | 48 | const uint32_t RULE_PRIORITY_VPN_OVERRIDE_OIF = 10500; |
Sreeram Ramachandran | 111bec2 | 2014-07-22 18:51:06 -0700 | [diff] [blame] | 49 | const uint32_t RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL = 11000; |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 50 | const uint32_t RULE_PRIORITY_SECURE_VPN = 12000; |
| 51 | const uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; |
| 52 | const uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; |
| 53 | const uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; |
| 54 | const uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 55 | const uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 56 | const uint32_t RULE_PRIORITY_TETHERING = 18000; |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 57 | const uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000; |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 58 | const uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000; |
Sreeram Ramachandran | 48e19b0 | 2014-07-22 22:23:20 -0700 | [diff] [blame] | 59 | const uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000; |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 60 | const uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; |
Lorenzo Colitti | a2c2305 | 2014-07-29 09:25:44 +0000 | [diff] [blame] | 61 | const uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000; |
Lorenzo Colitti | db74dba | 2014-07-29 18:26:21 +0900 | [diff] [blame] | 62 | const uint32_t RULE_PRIORITY_UNREACHABLE = 32000; |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 63 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 64 | const uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97; |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 65 | const uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98; |
| 66 | const uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99; |
| 67 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 68 | const char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network"; |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 69 | const char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network"; |
| 70 | const char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system"; |
| 71 | |
Sreeram Ramachandran | bb40d51 | 2014-07-11 11:45:14 -0700 | [diff] [blame] | 72 | const char* const ROUTE_TABLE_NAME_LOCAL = "local"; |
| 73 | const char* const ROUTE_TABLE_NAME_MAIN = "main"; |
| 74 | |
Lorenzo Colitti | 5965651 | 2014-06-25 03:20:29 +0900 | [diff] [blame] | 75 | // TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not |
| 76 | // upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make |
| 77 | // it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert |
| 78 | // that will warn us if upstream has given these values some other meaning. |
| 79 | const uint16_t FRA_UID_START = 18; |
| 80 | const uint16_t FRA_UID_END = 19; |
| 81 | static_assert(FRA_UID_START > FRA_MAX, |
| 82 | "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. " |
| 83 | "Check that these values match what the kernel does and then update this assertion."); |
| 84 | |
Lorenzo Colitti | 7272368 | 2014-06-26 13:51:10 +0900 | [diff] [blame] | 85 | const uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK; |
| 86 | const uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL; |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 87 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 88 | const sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0}; |
| 89 | |
| 90 | const uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; |
| 91 | |
| 92 | const char* const IP_VERSIONS[] = {"-4", "-6"}; |
| 93 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 94 | const uid_t UID_ROOT = 0; |
Lorenzo Colitti | 5ad4e98 | 2015-02-26 17:34:32 +0900 | [diff] [blame] | 95 | const char* const IIF_LOOPBACK = "lo"; |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 96 | const char* const IIF_NONE = NULL; |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 97 | const char* const OIF_NONE = NULL; |
| 98 | const bool ACTION_ADD = true; |
| 99 | const bool ACTION_DEL = false; |
| 100 | const bool MODIFY_NON_UID_BASED_RULES = true; |
| 101 | |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 102 | const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; |
Sreeram Ramachandran | c7d804c | 2014-07-09 07:39:30 -0700 | [diff] [blame] | 103 | const mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r-- |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 104 | |
Lorenzo Colitti | 99286fe | 2014-08-12 15:08:00 +0900 | [diff] [blame] | 105 | const unsigned ROUTE_FLUSH_ATTEMPTS = 2; |
| 106 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 107 | // Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" |
| 108 | // warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). |
| 109 | constexpr uint16_t U16_RTA_LENGTH(uint16_t x) { |
| 110 | return RTA_LENGTH(x); |
| 111 | } |
| 112 | |
| 113 | // These are practically const, but can't be declared so, because they are used to initialize |
| 114 | // non-const pointers ("void* iov_base") in iovec arrays. |
| 115 | rtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; |
| 116 | rtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; |
| 117 | rtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; |
| 118 | rtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; |
| 119 | rtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START }; |
| 120 | rtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END }; |
| 121 | |
| 122 | rtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; |
| 123 | rtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; |
| 124 | |
| 125 | uint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; |
| 126 | |
| 127 | // END CONSTANTS ---------------------------------------------------------------------------------- |
| 128 | |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 129 | // No locks needed because RouteController is accessed only from one thread (in CommandListener). |
| 130 | std::map<std::string, uint32_t> interfaceToTable; |
Paul Jensen | a561e12 | 2014-06-12 16:46:37 -0400 | [diff] [blame] | 131 | |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 132 | uint32_t getRouteTableForInterface(const char* interface) { |
Sreeram Ramachandran | a481180 | 2014-04-10 12:10:24 -0700 | [diff] [blame] | 133 | uint32_t index = if_nametoindex(interface); |
Paul Jensen | a561e12 | 2014-06-12 16:46:37 -0400 | [diff] [blame] | 134 | if (index) { |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 135 | index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; |
| 136 | interfaceToTable[interface] = index; |
| 137 | return index; |
Paul Jensen | a561e12 | 2014-06-12 16:46:37 -0400 | [diff] [blame] | 138 | } |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 139 | // If the interface goes away if_nametoindex() will return 0 but we still need to know |
| 140 | // the index so we can remove the rules and routes. |
| 141 | auto iter = interfaceToTable.find(interface); |
| 142 | if (iter == interfaceToTable.end()) { |
| 143 | ALOGE("cannot find interface %s", interface); |
| 144 | return RT_TABLE_UNSPEC; |
| 145 | } |
| 146 | return iter->second; |
| 147 | } |
| 148 | |
| 149 | void addTableName(uint32_t table, const std::string& name, std::string* contents) { |
| 150 | char tableString[UINT32_STRLEN]; |
| 151 | snprintf(tableString, sizeof(tableString), "%u", table); |
| 152 | *contents += tableString; |
| 153 | *contents += " "; |
| 154 | *contents += name; |
| 155 | *contents += "\n"; |
| 156 | } |
| 157 | |
| 158 | // Doesn't return success/failure as the file is optional; it's okay if we fail to update it. |
| 159 | void updateTableNamesFile() { |
| 160 | std::string contents; |
Sreeram Ramachandran | bb40d51 | 2014-07-11 11:45:14 -0700 | [diff] [blame] | 161 | |
| 162 | addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents); |
| 163 | addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents); |
| 164 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 165 | addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents); |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 166 | addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); |
| 167 | addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); |
Sreeram Ramachandran | bb40d51 | 2014-07-11 11:45:14 -0700 | [diff] [blame] | 168 | |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 169 | for (const auto& entry : interfaceToTable) { |
| 170 | addTableName(entry.second, entry.first, &contents); |
| 171 | } |
| 172 | |
Dan Albert | 5407e14 | 2015-03-16 10:05:59 -0700 | [diff] [blame] | 173 | if (!WriteStringToFile(contents, RT_TABLES_PATH, RT_TABLES_MODE, AID_SYSTEM, AID_WIFI)) { |
Elliott Hughes | bd37832 | 2015-02-04 13:25:14 -0800 | [diff] [blame] | 174 | ALOGE("failed to write to %s (%s)", RT_TABLES_PATH, strerror(errno)); |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 175 | return; |
| 176 | } |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 179 | // Sends a netlink request and expects an ack. |
| 180 | // |iov| is an array of struct iovec that contains the netlink message payload. |
| 181 | // The netlink header is generated by this function based on |action| and |flags|. |
| 182 | // Returns -errno if there was an error or if the kernel reported an error. |
Evgenii Stepanov | f65122c | 2016-02-11 16:55:56 -0800 | [diff] [blame] | 183 | |
| 184 | // Disable optimizations in ASan build. |
| 185 | // ASan reports an out-of-bounds 32-bit(!) access in the first loop of the |
| 186 | // function (over iov[]). |
| 187 | #ifdef __clang__ |
| 188 | #if __has_feature(address_sanitizer) |
| 189 | __attribute__((optnone)) |
| 190 | #endif |
| 191 | #endif |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 192 | WARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) { |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 193 | nlmsghdr nlmsg = { |
| 194 | .nlmsg_type = action, |
| 195 | .nlmsg_flags = flags, |
| 196 | }; |
| 197 | iov[0].iov_base = &nlmsg; |
| 198 | iov[0].iov_len = sizeof(nlmsg); |
| 199 | for (int i = 0; i < iovlen; ++i) { |
| 200 | nlmsg.nlmsg_len += iov[i].iov_len; |
| 201 | } |
| 202 | |
| 203 | int ret; |
| 204 | struct { |
| 205 | nlmsghdr msg; |
| 206 | nlmsgerr err; |
| 207 | } response; |
| 208 | |
Nick Kralevich | 53ea9ca | 2015-01-31 13:54:00 -0800 | [diff] [blame] | 209 | int sock = socket(AF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_ROUTE); |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 210 | if (sock != -1 && |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 211 | connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS), |
| 212 | sizeof(NETLINK_ADDRESS)) != -1 && |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 213 | writev(sock, iov, iovlen) != -1 && |
| 214 | (ret = recv(sock, &response, sizeof(response), 0)) != -1) { |
| 215 | if (ret == sizeof(response)) { |
| 216 | ret = response.err.error; // Netlink errors are negative errno. |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 217 | if (ret) { |
| 218 | ALOGE("netlink response contains error (%s)", strerror(-ret)); |
| 219 | } |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 220 | } else { |
Sreeram Ramachandran | 1201e84 | 2014-07-01 15:06:05 -0700 | [diff] [blame] | 221 | ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response)); |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 222 | ret = -EBADMSG; |
| 223 | } |
| 224 | } else { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 225 | ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno)); |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 226 | ret = -errno; |
| 227 | } |
| 228 | |
| 229 | if (sock != -1) { |
| 230 | close(sock); |
| 231 | } |
| 232 | |
| 233 | return ret; |
| 234 | } |
| 235 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 236 | // Returns 0 on success or negative errno on failure. |
| 237 | int padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { |
| 238 | if (!input) { |
| 239 | *length = 0; |
| 240 | *padding = 0; |
| 241 | return 0; |
| 242 | } |
| 243 | *length = strlcpy(name, input, IFNAMSIZ) + 1; |
| 244 | if (*length > IFNAMSIZ) { |
| 245 | ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); |
| 246 | return -ENAMETOOLONG; |
| 247 | } |
| 248 | *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); |
| 249 | return 0; |
| 250 | } |
| 251 | |
Sreeram Ramachandran | 8fe9c8e | 2014-04-16 12:08:05 -0700 | [diff] [blame] | 252 | // Adds or removes a routing rule for IPv4 and IPv6. |
| 253 | // |
Lorenzo Colitti | 6b6f25f | 2015-03-03 17:22:57 +0900 | [diff] [blame] | 254 | // + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the table is |
Robin Lee | 4ef9464 | 2016-04-01 11:50:49 +0100 | [diff] [blame^] | 255 | // unspecified. An unspecified table is not allowed when creating an FR_ACT_TO_TBL rule. |
Sreeram Ramachandran | 8fe9c8e | 2014-04-16 12:08:05 -0700 | [diff] [blame] | 256 | // + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is |
| 257 | // ignored. |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 258 | // + If |iif| is non-NULL, the rule matches the specified incoming interface. |
| 259 | // + If |oif| is non-NULL, the rule matches the specified outgoing interface. |
| 260 | // + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that |
| 261 | // range (inclusive). Otherwise, the rule matches packets from all UIDs. |
Lorenzo Colitti | 96f261e | 2014-06-23 15:09:54 +0900 | [diff] [blame] | 262 | // |
| 263 | // Returns 0 on success or negative errno on failure. |
Robin Lee | 4ef9464 | 2016-04-01 11:50:49 +0100 | [diff] [blame^] | 264 | WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint8_t ruleType, |
| 265 | uint32_t table, uint32_t fwmark, uint32_t mask, const char* iif, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 266 | const char* oif, uid_t uidStart, uid_t uidEnd) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 267 | // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. |
| 268 | if (fwmark & ~mask) { |
| 269 | ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); |
| 270 | return -ERANGE; |
| 271 | } |
| 272 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 273 | // Interface names must include exactly one terminating NULL and be properly padded, or older |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 274 | // kernels will refuse to delete rules. |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 275 | char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; |
| 276 | size_t iifLength, oifLength; |
| 277 | uint16_t iifPadding, oifPadding; |
| 278 | if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { |
| 279 | return ret; |
| 280 | } |
| 281 | if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { |
| 282 | return ret; |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 283 | } |
| 284 | |
Lorenzo Colitti | 5965651 | 2014-06-25 03:20:29 +0900 | [diff] [blame] | 285 | // Either both start and end UID must be specified, or neither. |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 286 | if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { |
Sreeram Ramachandran | cf89138 | 2014-07-01 15:49:20 -0700 | [diff] [blame] | 287 | ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); |
Lorenzo Colitti | 5965651 | 2014-06-25 03:20:29 +0900 | [diff] [blame] | 288 | return -EUSERS; |
| 289 | } |
Robin Lee | 4ef9464 | 2016-04-01 11:50:49 +0100 | [diff] [blame^] | 290 | |
Lorenzo Colitti | 7272368 | 2014-06-26 13:51:10 +0900 | [diff] [blame] | 291 | bool isUidRule = (uidStart != INVALID_UID); |
Lorenzo Colitti | 5965651 | 2014-06-25 03:20:29 +0900 | [diff] [blame] | 292 | |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 293 | // Assemble a rule request and put it in an array of iovec structures. |
| 294 | fib_rule_hdr rule = { |
Robin Lee | 4ef9464 | 2016-04-01 11:50:49 +0100 | [diff] [blame^] | 295 | .action = ruleType, |
Lorenzo Colitti | 6b6f25f | 2015-03-03 17:22:57 +0900 | [diff] [blame] | 296 | // Note that here we're implicitly setting rule.table to 0. When we want to specify a |
| 297 | // non-zero table, we do this via the FRATTR_TABLE attribute. |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 298 | }; |
| 299 | |
Lorenzo Colitti | 6b6f25f | 2015-03-03 17:22:57 +0900 | [diff] [blame] | 300 | // Don't ever create a rule that looks up table 0, because table 0 is the local table. |
| 301 | // It's OK to specify a table ID of 0 when deleting a rule, because that doesn't actually select |
| 302 | // table 0, it's a wildcard that matches anything. |
| 303 | if (table == RT_TABLE_UNSPEC && rule.action == FR_ACT_TO_TBL && action != RTM_DELRULE) { |
| 304 | ALOGE("RT_TABLE_UNSPEC only allowed when deleting rules"); |
| 305 | return -ENOTUNIQ; |
| 306 | } |
| 307 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 308 | rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; |
| 309 | rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 310 | |
| 311 | iovec iov[] = { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 312 | { NULL, 0 }, |
| 313 | { &rule, sizeof(rule) }, |
| 314 | { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, |
| 315 | { &priority, sizeof(priority) }, |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 316 | { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, |
| 317 | { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 318 | { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, |
| 319 | { &fwmark, mask ? sizeof(fwmark) : 0 }, |
| 320 | { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, |
| 321 | { &mask, mask ? sizeof(mask) : 0 }, |
| 322 | { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 }, |
| 323 | { &uidStart, isUidRule ? sizeof(uidStart) : 0 }, |
| 324 | { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 }, |
| 325 | { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 }, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 326 | { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, |
| 327 | { iifName, iifLength }, |
| 328 | { PADDING_BUFFER, iifPadding }, |
| 329 | { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, |
| 330 | { oifName, oifLength }, |
| 331 | { PADDING_BUFFER, oifPadding }, |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 332 | }; |
| 333 | |
Lorenzo Colitti | 7272368 | 2014-06-26 13:51:10 +0900 | [diff] [blame] | 334 | uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 335 | for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { |
| 336 | rule.family = AF_FAMILIES[i]; |
| 337 | if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) { |
Lorenzo Colitti | 96f261e | 2014-06-23 15:09:54 +0900 | [diff] [blame] | 338 | return ret; |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 339 | } |
| 340 | } |
| 341 | |
Lorenzo Colitti | 96f261e | 2014-06-23 15:09:54 +0900 | [diff] [blame] | 342 | return 0; |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 343 | } |
| 344 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 345 | WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, |
Robin Lee | 4ef9464 | 2016-04-01 11:50:49 +0100 | [diff] [blame^] | 346 | uint32_t fwmark, uint32_t mask, const char* iif, |
| 347 | const char* oif, uid_t uidStart, uid_t uidEnd) { |
| 348 | return modifyIpRule(action, priority, FR_ACT_TO_TBL, table, fwmark, mask, iif, oif, uidStart, |
| 349 | uidEnd); |
| 350 | } |
| 351 | |
| 352 | WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 353 | uint32_t fwmark, uint32_t mask) { |
| 354 | return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, |
| 355 | INVALID_UID); |
| 356 | } |
| 357 | |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 358 | // Adds or deletes an IPv4 or IPv6 route. |
| 359 | // Returns 0 on success or negative errno on failure. |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 360 | WARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, |
| 361 | const char* destination, const char* nexthop) { |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 362 | // At least the destination must be non-null. |
| 363 | if (!destination) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 364 | ALOGE("null destination"); |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 365 | return -EFAULT; |
| 366 | } |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 367 | |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 368 | // Parse the prefix. |
| 369 | uint8_t rawAddress[sizeof(in6_addr)]; |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 370 | uint8_t family; |
| 371 | uint8_t prefixLength; |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 372 | int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), |
| 373 | &prefixLength); |
| 374 | if (rawLength < 0) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 375 | ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 376 | return rawLength; |
| 377 | } |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 378 | |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 379 | if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { |
Sreeram Ramachandran | 1201e84 | 2014-07-01 15:06:05 -0700 | [diff] [blame] | 380 | ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 381 | return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. |
| 382 | } |
| 383 | |
Sreeram Ramachandran | de5d5df | 2014-07-26 18:43:25 -0700 | [diff] [blame] | 384 | uint8_t type = RTN_UNICAST; |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 385 | uint32_t ifindex; |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 386 | uint8_t rawNexthop[sizeof(in6_addr)]; |
Sreeram Ramachandran | de5d5df | 2014-07-26 18:43:25 -0700 | [diff] [blame] | 387 | |
| 388 | if (nexthop && !strcmp(nexthop, "unreachable")) { |
| 389 | type = RTN_UNREACHABLE; |
| 390 | // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup |
| 391 | // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for |
| 392 | // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.) |
| 393 | interface = OIF_NONE; |
| 394 | nexthop = NULL; |
Lorenzo Colitti | 4c95a12 | 2014-09-18 16:01:50 +0900 | [diff] [blame] | 395 | } else if (nexthop && !strcmp(nexthop, "throw")) { |
| 396 | type = RTN_THROW; |
| 397 | interface = OIF_NONE; |
| 398 | nexthop = NULL; |
Sreeram Ramachandran | de5d5df | 2014-07-26 18:43:25 -0700 | [diff] [blame] | 399 | } else { |
| 400 | // If an interface was specified, find the ifindex. |
| 401 | if (interface != OIF_NONE) { |
| 402 | ifindex = if_nametoindex(interface); |
| 403 | if (!ifindex) { |
| 404 | ALOGE("cannot find interface %s", interface); |
| 405 | return -ENODEV; |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | // If a nexthop was specified, parse it as the same family as the prefix. |
| 410 | if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { |
| 411 | ALOGE("inet_pton failed for nexthop %s", nexthop); |
| 412 | return -EINVAL; |
| 413 | } |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 414 | } |
| 415 | |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 416 | // Assemble a rtmsg and put it in an array of iovec structures. |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 417 | rtmsg route = { |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 418 | .rtm_protocol = RTPROT_STATIC, |
Sreeram Ramachandran | de5d5df | 2014-07-26 18:43:25 -0700 | [diff] [blame] | 419 | .rtm_type = type, |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 420 | .rtm_family = family, |
| 421 | .rtm_dst_len = prefixLength, |
Sreeram Ramachandran | 2bff72e | 2014-07-18 13:03:47 -0700 | [diff] [blame] | 422 | .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK), |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 423 | }; |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 424 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 425 | rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; |
| 426 | rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 427 | |
| 428 | iovec iov[] = { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 429 | { NULL, 0 }, |
| 430 | { &route, sizeof(route) }, |
| 431 | { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, |
| 432 | { &table, sizeof(table) }, |
| 433 | { &rtaDst, sizeof(rtaDst) }, |
| 434 | { rawAddress, static_cast<size_t>(rawLength) }, |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 435 | { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, |
| 436 | { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 437 | { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, |
| 438 | { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 439 | }; |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 440 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 441 | uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : |
| 442 | NETLINK_REQUEST_FLAGS; |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 443 | return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov)); |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 444 | } |
| 445 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 446 | // An iptables rule to mark incoming packets on a network with the netId of the network. |
| 447 | // |
| 448 | // This is so that the kernel can: |
| 449 | // + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping |
| 450 | // replies, SYN-ACKs, etc). |
| 451 | // + Mark sockets that accept connections from this interface so that the connection stays on the |
| 452 | // same interface. |
| 453 | WARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, |
| 454 | Permission permission, bool add) { |
| 455 | Fwmark fwmark; |
| 456 | |
| 457 | fwmark.netId = netId; |
| 458 | fwmark.explicitlySelected = true; |
| 459 | fwmark.protectedFromVpn = true; |
| 460 | fwmark.permission = permission; |
| 461 | |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 462 | char markString[UINT32_HEX_STRLEN]; |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 463 | snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue); |
| 464 | |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 465 | if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j", |
| 466 | "MARK", "--set-mark", markString, NULL)) { |
| 467 | ALOGE("failed to change iptables rule that sets incoming packet mark"); |
| 468 | return -EREMOTEIO; |
| 469 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 470 | |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 471 | return 0; |
| 472 | } |
| 473 | |
Sreeram Ramachandran | 111bec2 | 2014-07-22 18:51:06 -0700 | [diff] [blame] | 474 | // A rule to route responses to the local network forwarded via the VPN. |
| 475 | // |
| 476 | // When a VPN is in effect, packets from the local network to upstream networks are forwarded into |
| 477 | // the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel. |
| 478 | WARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) { |
| 479 | return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL, |
| 480 | ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE, |
| 481 | INVALID_UID, INVALID_UID); |
| 482 | } |
| 483 | |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 484 | // A rule to route all traffic from a given set of UIDs to go over the VPN. |
| 485 | // |
| 486 | // Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may |
| 487 | // have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to |
| 488 | // bypass the VPN if the protectedFromVpn bit is set. |
| 489 | WARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 490 | bool secure, bool add) { |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 491 | Fwmark fwmark; |
| 492 | Fwmark mask; |
| 493 | |
| 494 | fwmark.protectedFromVpn = false; |
| 495 | mask.protectedFromVpn = true; |
| 496 | |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 497 | uint32_t priority; |
| 498 | |
| 499 | if (secure) { |
| 500 | priority = RULE_PRIORITY_SECURE_VPN; |
| 501 | } else { |
| 502 | priority = RULE_PRIORITY_BYPASSABLE_VPN; |
| 503 | |
| 504 | fwmark.explicitlySelected = false; |
| 505 | mask.explicitlySelected = true; |
| 506 | } |
| 507 | |
| 508 | return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, |
Lorenzo Colitti | 5ad4e98 | 2015-02-26 17:34:32 +0900 | [diff] [blame] | 509 | mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd); |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 510 | } |
| 511 | |
| 512 | // A rule to allow system apps to send traffic over this VPN even if they are not part of the target |
| 513 | // set of UIDs. |
| 514 | // |
| 515 | // This is needed for DnsProxyListener to correctly resolve a request for a user who is in the |
| 516 | // target set, but where the DnsProxyListener itself is not. |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 517 | WARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure, |
| 518 | bool add) { |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 519 | Fwmark fwmark; |
| 520 | Fwmark mask; |
| 521 | |
| 522 | fwmark.netId = netId; |
| 523 | mask.netId = FWMARK_NET_ID_MASK; |
| 524 | |
| 525 | fwmark.permission = PERMISSION_SYSTEM; |
| 526 | mask.permission = PERMISSION_SYSTEM; |
| 527 | |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 528 | uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN; |
| 529 | |
| 530 | return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, |
| 531 | mask.intValue); |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 532 | } |
| 533 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 534 | // A rule to route traffic based on an explicitly chosen network. |
| 535 | // |
| 536 | // Supports apps that use the multinetwork APIs to restrict their traffic to a network. |
| 537 | // |
| 538 | // Even though we check permissions at the time we set a netId into the fwmark of a socket, we need |
| 539 | // to check it again in the rules here, because a network's permissions may have been updated via |
| 540 | // modifyNetworkPermission(). |
| 541 | WARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, |
| 542 | Permission permission, uid_t uidStart, |
| 543 | uid_t uidEnd, bool add) { |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 544 | Fwmark fwmark; |
| 545 | Fwmark mask; |
| 546 | |
| 547 | fwmark.netId = netId; |
| 548 | mask.netId = FWMARK_NET_ID_MASK; |
| 549 | |
Sreeram Ramachandran | 122f581 | 2014-05-11 20:29:49 -0700 | [diff] [blame] | 550 | fwmark.explicitlySelected = true; |
| 551 | mask.explicitlySelected = true; |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 552 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 553 | fwmark.permission = permission; |
| 554 | mask.permission = permission; |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 555 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 556 | return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 557 | fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 558 | } |
| 559 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 560 | // A rule to route traffic based on a chosen outgoing interface. |
| 561 | // |
| 562 | // Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows |
| 563 | // the outgoing interface (typically for link-local communications). |
Lorenzo Colitti | 57947f0 | 2015-02-27 16:45:55 +0900 | [diff] [blame] | 564 | WARN_UNUSED_RESULT int modifyOutputInterfaceRules(const char* interface, uint32_t table, |
| 565 | Permission permission, uid_t uidStart, |
| 566 | uid_t uidEnd, bool add) { |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 567 | Fwmark fwmark; |
| 568 | Fwmark mask; |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 569 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 570 | fwmark.permission = permission; |
| 571 | mask.permission = permission; |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 572 | |
Lorenzo Colitti | 57947f0 | 2015-02-27 16:45:55 +0900 | [diff] [blame] | 573 | // If this rule does not specify a UID range, then also add a corresponding high-priority rule |
| 574 | // for UID. This covers forwarded packets and system daemons such as the tethering DHCP server. |
| 575 | if (uidStart == INVALID_UID && uidEnd == INVALID_UID) { |
| 576 | if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OVERRIDE_OIF, |
| 577 | table, fwmark.intValue, mask.intValue, IIF_NONE, interface, |
| 578 | UID_ROOT, UID_ROOT)) { |
| 579 | return ret; |
| 580 | } |
| 581 | } |
| 582 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 583 | return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 584 | fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 585 | } |
| 586 | |
| 587 | // A rule to route traffic based on the chosen network. |
| 588 | // |
| 589 | // This is for sockets that have not explicitly requested a particular network, but have been |
| 590 | // bound to one when they called connect(). This ensures that sockets connected on a particular |
| 591 | // network stay on that network even if the default network changes. |
| 592 | WARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, |
| 593 | Permission permission, bool add) { |
| 594 | Fwmark fwmark; |
| 595 | Fwmark mask; |
| 596 | |
| 597 | fwmark.netId = netId; |
| 598 | mask.netId = FWMARK_NET_ID_MASK; |
| 599 | |
| 600 | fwmark.explicitlySelected = false; |
| 601 | mask.explicitlySelected = true; |
| 602 | |
| 603 | fwmark.permission = permission; |
| 604 | mask.permission = permission; |
| 605 | |
| 606 | return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 607 | fwmark.intValue, mask.intValue); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 608 | } |
| 609 | |
Sreeram Ramachandran | 48e19b0 | 2014-07-22 22:23:20 -0700 | [diff] [blame] | 610 | // A rule to enable split tunnel VPNs. |
| 611 | // |
| 612 | // If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to |
| 613 | // go over the default network, provided it wasn't explicitly restricted to the VPN and has the |
| 614 | // permissions required by the default network. |
| 615 | WARN_UNUSED_RESULT int modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId, |
| 616 | const char* physicalInterface, |
| 617 | Permission permission) { |
| 618 | uint32_t table = getRouteTableForInterface(physicalInterface); |
| 619 | if (table == RT_TABLE_UNSPEC) { |
| 620 | return -ESRCH; |
| 621 | } |
| 622 | |
| 623 | Fwmark fwmark; |
| 624 | Fwmark mask; |
| 625 | |
| 626 | fwmark.netId = vpnNetId; |
| 627 | mask.netId = FWMARK_NET_ID_MASK; |
| 628 | |
| 629 | fwmark.explicitlySelected = false; |
| 630 | mask.explicitlySelected = true; |
| 631 | |
| 632 | fwmark.permission = permission; |
| 633 | mask.permission = permission; |
| 634 | |
| 635 | return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue, |
| 636 | mask.intValue); |
| 637 | } |
| 638 | |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 639 | // Add rules to allow legacy routes added through the requestRouteToHost() API. |
| 640 | WARN_UNUSED_RESULT int addLegacyRouteRules() { |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 641 | Fwmark fwmark; |
| 642 | Fwmark mask; |
| 643 | |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 644 | fwmark.explicitlySelected = false; |
| 645 | mask.explicitlySelected = true; |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 646 | |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 647 | // Rules to allow legacy routes to override the default network. |
| 648 | if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, |
| 649 | fwmark.intValue, mask.intValue)) { |
| 650 | return ret; |
| 651 | } |
| 652 | if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, |
| 653 | ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { |
| 654 | return ret; |
| 655 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 656 | |
| 657 | fwmark.permission = PERMISSION_SYSTEM; |
| 658 | mask.permission = PERMISSION_SYSTEM; |
| 659 | |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 660 | // A rule to allow legacy routes from system apps to override VPNs. |
| 661 | return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 662 | fwmark.intValue, mask.intValue); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 663 | } |
| 664 | |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 665 | // Add rules to lookup the local network when specified explicitly or otherwise. |
| 666 | WARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) { |
| 667 | if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, |
| 668 | INVALID_UID, INVALID_UID, ACTION_ADD)) { |
| 669 | return ret; |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 670 | } |
| 671 | |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 672 | Fwmark fwmark; |
| 673 | Fwmark mask; |
| 674 | |
| 675 | fwmark.explicitlySelected = false; |
| 676 | mask.explicitlySelected = true; |
| 677 | |
| 678 | return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, |
| 679 | fwmark.intValue, mask.intValue); |
| 680 | } |
| 681 | |
Lorenzo Colitti | 3667936 | 2015-02-25 10:26:19 +0900 | [diff] [blame] | 682 | int configureDummyNetwork() { |
| 683 | const char *interface = DummyNetwork::INTERFACE_NAME; |
| 684 | uint32_t table = getRouteTableForInterface(interface); |
| 685 | if (table == RT_TABLE_UNSPEC) { |
| 686 | // getRouteTableForInterface has already looged an error. |
| 687 | return -ESRCH; |
| 688 | } |
| 689 | |
| 690 | ifc_init(); |
| 691 | int ret = ifc_up(interface); |
| 692 | ifc_close(); |
| 693 | if (ret) { |
| 694 | ALOGE("Can't bring up %s: %s", interface, strerror(errno)); |
| 695 | return -errno; |
| 696 | } |
| 697 | |
Lorenzo Colitti | 57947f0 | 2015-02-27 16:45:55 +0900 | [diff] [blame] | 698 | if ((ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, |
| 699 | INVALID_UID, INVALID_UID, ACTION_ADD))) { |
| 700 | ALOGE("Can't create oif rules for %s: %s", interface, strerror(-ret)); |
Lorenzo Colitti | 3667936 | 2015-02-25 10:26:19 +0900 | [diff] [blame] | 701 | return ret; |
| 702 | } |
| 703 | |
| 704 | if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "0.0.0.0/0", NULL))) { |
| 705 | ALOGE("Can't add IPv4 default route to %s: %s", interface, strerror(-ret)); |
| 706 | return ret; |
| 707 | } |
| 708 | |
| 709 | if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "::/0", NULL))) { |
| 710 | ALOGE("Can't add IPv6 default route to %s: %s", interface, strerror(-ret)); |
| 711 | return ret; |
| 712 | } |
| 713 | |
| 714 | return 0; |
| 715 | } |
| 716 | |
Lorenzo Colitti | a2c2305 | 2014-07-29 09:25:44 +0000 | [diff] [blame] | 717 | // Add a new rule to look up the 'main' table, with the same selectors as the "default network" |
Lorenzo Colitti | db74dba | 2014-07-29 18:26:21 +0900 | [diff] [blame] | 718 | // rule, but with a lower priority. We will never create routes in the main table; it should only be |
| 719 | // used for directly-connected routes implicitly created by the kernel when adding IP addresses. |
| 720 | // This is necessary, for example, when adding a route through a directly-connected gateway: in |
| 721 | // order to add the route, there must already be a directly-connected route that covers the gateway. |
Lorenzo Colitti | a2c2305 | 2014-07-29 09:25:44 +0000 | [diff] [blame] | 722 | WARN_UNUSED_RESULT int addDirectlyConnectedRule() { |
| 723 | Fwmark fwmark; |
| 724 | Fwmark mask; |
| 725 | |
| 726 | fwmark.netId = NETID_UNSET; |
| 727 | mask.netId = FWMARK_NET_ID_MASK; |
| 728 | |
| 729 | return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN, |
| 730 | fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, UID_ROOT, UID_ROOT); |
| 731 | } |
| 732 | |
Lorenzo Colitti | db74dba | 2014-07-29 18:26:21 +0900 | [diff] [blame] | 733 | // Add an explicit unreachable rule close to the end of the prioriy list to make it clear that |
| 734 | // relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended |
| 735 | // behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable |
| 736 | // rule will hopefully make things even clearer. |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 737 | WARN_UNUSED_RESULT int addUnreachableRule() { |
| 738 | return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET, |
| 739 | MARK_UNSET); |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 740 | } |
| 741 | |
| 742 | WARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 743 | if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { |
| 744 | return ret; |
| 745 | } |
Lorenzo Colitti | 57947f0 | 2015-02-27 16:45:55 +0900 | [diff] [blame] | 746 | return modifyOutputInterfaceRules(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, |
| 747 | INVALID_UID, INVALID_UID, add); |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 748 | } |
| 749 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 750 | WARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface, |
| 751 | Permission permission, bool add) { |
| 752 | uint32_t table = getRouteTableForInterface(interface); |
| 753 | if (table == RT_TABLE_UNSPEC) { |
| 754 | return -ESRCH; |
| 755 | } |
| 756 | |
| 757 | if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { |
| 758 | return ret; |
| 759 | } |
| 760 | if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, |
| 761 | add)) { |
| 762 | return ret; |
| 763 | } |
Lorenzo Colitti | 57947f0 | 2015-02-27 16:45:55 +0900 | [diff] [blame] | 764 | if (int ret = modifyOutputInterfaceRules(interface, table, permission, INVALID_UID, INVALID_UID, |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 765 | add)) { |
| 766 | return ret; |
| 767 | } |
| 768 | return modifyImplicitNetworkRule(netId, table, permission, add); |
| 769 | } |
| 770 | |
| 771 | WARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface, |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 772 | const UidRanges& uidRanges, bool secure, bool add, |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 773 | bool modifyNonUidBasedRules) { |
| 774 | uint32_t table = getRouteTableForInterface(interface); |
| 775 | if (table == RT_TABLE_UNSPEC) { |
| 776 | return -ESRCH; |
| 777 | } |
| 778 | |
Sreeram Ramachandran | e09b20a | 2014-07-05 17:15:14 -0700 | [diff] [blame] | 779 | for (const UidRanges::Range& range : uidRanges.getRanges()) { |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 780 | if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, secure, add)) { |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 781 | return ret; |
| 782 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 783 | if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first, |
| 784 | range.second, add)) { |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 785 | return ret; |
| 786 | } |
Lorenzo Colitti | 57947f0 | 2015-02-27 16:45:55 +0900 | [diff] [blame] | 787 | if (int ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, range.first, |
| 788 | range.second, add)) { |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 789 | return ret; |
| 790 | } |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 791 | } |
| 792 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 793 | if (modifyNonUidBasedRules) { |
| 794 | if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 795 | return ret; |
| 796 | } |
Sreeram Ramachandran | 111bec2 | 2014-07-22 18:51:06 -0700 | [diff] [blame] | 797 | if (int ret = modifyVpnOutputToLocalRule(interface, add)) { |
| 798 | return ret; |
| 799 | } |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 800 | if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) { |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 801 | return ret; |
| 802 | } |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 803 | return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add); |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 804 | } |
| 805 | |
| 806 | return 0; |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 807 | } |
| 808 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 809 | WARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface, |
| 810 | Permission permission) { |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 811 | uint32_t table = getRouteTableForInterface(interface); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 812 | if (table == RT_TABLE_UNSPEC) { |
Lorenzo Colitti | 96f261e | 2014-06-23 15:09:54 +0900 | [diff] [blame] | 813 | return -ESRCH; |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 814 | } |
| 815 | |
Sreeram Ramachandran | 122f581 | 2014-05-11 20:29:49 -0700 | [diff] [blame] | 816 | Fwmark fwmark; |
Sreeram Ramachandran | 122f581 | 2014-05-11 20:29:49 -0700 | [diff] [blame] | 817 | Fwmark mask; |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 818 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 819 | fwmark.netId = NETID_UNSET; |
Sreeram Ramachandran | 122f581 | 2014-05-11 20:29:49 -0700 | [diff] [blame] | 820 | mask.netId = FWMARK_NET_ID_MASK; |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 821 | |
| 822 | fwmark.permission = permission; |
Sreeram Ramachandran | 122f581 | 2014-05-11 20:29:49 -0700 | [diff] [blame] | 823 | mask.permission = permission; |
| 824 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 825 | return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 826 | mask.intValue); |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 827 | } |
| 828 | |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 829 | WARN_UNUSED_RESULT int modifyTetheredNetwork(uint16_t action, const char* inputInterface, |
| 830 | const char* outputInterface) { |
| 831 | uint32_t table = getRouteTableForInterface(outputInterface); |
| 832 | if (table == RT_TABLE_UNSPEC) { |
| 833 | return -ESRCH; |
| 834 | } |
| 835 | |
| 836 | return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, |
| 837 | inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); |
| 838 | } |
| 839 | |
Sreeram Ramachandran | b717e74 | 2014-07-19 00:22:15 -0700 | [diff] [blame] | 840 | // Returns 0 on success or negative errno on failure. |
| 841 | WARN_UNUSED_RESULT int flushRules() { |
| 842 | for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { |
| 843 | const char* argv[] = { |
| 844 | IP_PATH, |
| 845 | IP_VERSIONS[i], |
| 846 | "rule", |
| 847 | "flush", |
| 848 | }; |
| 849 | if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { |
| 850 | ALOGE("failed to flush rules"); |
| 851 | return -EREMOTEIO; |
| 852 | } |
| 853 | } |
| 854 | return 0; |
| 855 | } |
| 856 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 857 | // Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected |
Lorenzo Colitti | f7fc8ec | 2014-06-18 00:41:58 +0900 | [diff] [blame] | 858 | // route, to the main table as well. |
| 859 | // Returns 0 on success or negative errno on failure. |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 860 | WARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination, |
| 861 | const char* nexthop, RouteController::TableType tableType) { |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 862 | uint32_t table; |
Sreeram Ramachandran | 38b7af1 | 2014-05-22 14:21:49 -0700 | [diff] [blame] | 863 | switch (tableType) { |
| 864 | case RouteController::INTERFACE: { |
| 865 | table = getRouteTableForInterface(interface); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 866 | if (table == RT_TABLE_UNSPEC) { |
| 867 | return -ESRCH; |
| 868 | } |
Sreeram Ramachandran | 38b7af1 | 2014-05-22 14:21:49 -0700 | [diff] [blame] | 869 | break; |
| 870 | } |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 871 | case RouteController::LOCAL_NETWORK: { |
| 872 | table = ROUTE_TABLE_LOCAL_NETWORK; |
| 873 | break; |
| 874 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 875 | case RouteController::LEGACY_NETWORK: { |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 876 | table = ROUTE_TABLE_LEGACY_NETWORK; |
Sreeram Ramachandran | 38b7af1 | 2014-05-22 14:21:49 -0700 | [diff] [blame] | 877 | break; |
| 878 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 879 | case RouteController::LEGACY_SYSTEM: { |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 880 | table = ROUTE_TABLE_LEGACY_SYSTEM; |
Sreeram Ramachandran | 38b7af1 | 2014-05-22 14:21:49 -0700 | [diff] [blame] | 881 | break; |
| 882 | } |
| 883 | } |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 884 | |
Lorenzo Colitti | f7fc8ec | 2014-06-18 00:41:58 +0900 | [diff] [blame] | 885 | int ret = modifyIpRoute(action, table, interface, destination, nexthop); |
Sreeram Ramachandran | 0321315 | 2014-10-30 10:01:07 -0700 | [diff] [blame] | 886 | // Trying to add a route that already exists shouldn't cause an error. |
| 887 | if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { |
Lorenzo Colitti | f7fc8ec | 2014-06-18 00:41:58 +0900 | [diff] [blame] | 888 | return ret; |
Sreeram Ramachandran | c921337 | 2014-04-16 12:32:18 -0700 | [diff] [blame] | 889 | } |
| 890 | |
Lorenzo Colitti | f7fc8ec | 2014-06-18 00:41:58 +0900 | [diff] [blame] | 891 | return 0; |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 892 | } |
| 893 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 894 | // Returns 0 on success or negative errno on failure. |
| 895 | WARN_UNUSED_RESULT int flushRoutes(const char* interface) { |
Sreeram Ramachandran | 92b66c4 | 2014-04-15 14:28:55 -0700 | [diff] [blame] | 896 | uint32_t table = getRouteTableForInterface(interface); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 897 | if (table == RT_TABLE_UNSPEC) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 898 | return -ESRCH; |
Sreeram Ramachandran | 92b66c4 | 2014-04-15 14:28:55 -0700 | [diff] [blame] | 899 | } |
| 900 | |
Lorenzo Colitti | 357e562 | 2014-06-17 16:14:17 +0900 | [diff] [blame] | 901 | char tableString[UINT32_STRLEN]; |
| 902 | snprintf(tableString, sizeof(tableString), "%u", table); |
| 903 | |
Lorenzo Colitti | 99286fe | 2014-08-12 15:08:00 +0900 | [diff] [blame] | 904 | int ret = 0; |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 905 | for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { |
Lorenzo Colitti | 357e562 | 2014-06-17 16:14:17 +0900 | [diff] [blame] | 906 | const char* argv[] = { |
| 907 | IP_PATH, |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 908 | IP_VERSIONS[i], |
Sreeram Ramachandran | 72999d6 | 2014-07-02 18:06:34 -0700 | [diff] [blame] | 909 | "route", |
Lorenzo Colitti | 357e562 | 2014-06-17 16:14:17 +0900 | [diff] [blame] | 910 | "flush", |
| 911 | "table", |
| 912 | tableString, |
| 913 | }; |
Lorenzo Colitti | 99286fe | 2014-08-12 15:08:00 +0900 | [diff] [blame] | 914 | |
| 915 | // A flush works by dumping routes and deleting each route as it's returned, and it can |
| 916 | // fail if something else deletes the route between the dump and the delete. This can |
| 917 | // happen, for example, if an interface goes down while we're trying to flush its routes. |
| 918 | // So try multiple times and only return an error if the last attempt fails. |
| 919 | // |
| 920 | // TODO: replace this with our own netlink code. |
| 921 | unsigned attempts = 0; |
| 922 | int err; |
| 923 | do { |
| 924 | err = android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), |
| 925 | NULL, false, false); |
| 926 | ++attempts; |
| 927 | } while (err != 0 && attempts < ROUTE_FLUSH_ATTEMPTS); |
| 928 | if (err) { |
| 929 | ALOGE("failed to flush %s routes in table %s after %d attempts", |
| 930 | IP_VERSIONS[i], tableString, attempts); |
| 931 | ret = -EREMOTEIO; |
Lorenzo Colitti | 357e562 | 2014-06-17 16:14:17 +0900 | [diff] [blame] | 932 | } |
| 933 | } |
| 934 | |
Lorenzo Colitti | 99286fe | 2014-08-12 15:08:00 +0900 | [diff] [blame] | 935 | // If we failed to flush routes, the caller may elect to keep this interface around, so keep |
| 936 | // track of its name. |
| 937 | if (!ret) { |
| 938 | interfaceToTable.erase(interface); |
| 939 | } |
| 940 | |
| 941 | return ret; |
Sreeram Ramachandran | 92b66c4 | 2014-04-15 14:28:55 -0700 | [diff] [blame] | 942 | } |
| 943 | |
Lorenzo Colitti | 6b6f25f | 2015-03-03 17:22:57 +0900 | [diff] [blame] | 944 | WARN_UNUSED_RESULT int clearTetheringRules(const char* inputInterface) { |
| 945 | int ret = 0; |
| 946 | while (ret == 0) { |
| 947 | ret = modifyIpRule(RTM_DELRULE, RULE_PRIORITY_TETHERING, 0, MARK_UNSET, MARK_UNSET, |
| 948 | inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); |
| 949 | } |
| 950 | |
| 951 | if (ret == -ENOENT) { |
| 952 | return 0; |
| 953 | } else { |
| 954 | return ret; |
| 955 | } |
| 956 | } |
| 957 | |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 958 | } // namespace |
| 959 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 960 | int RouteController::Init(unsigned localNetId) { |
Sreeram Ramachandran | b717e74 | 2014-07-19 00:22:15 -0700 | [diff] [blame] | 961 | if (int ret = flushRules()) { |
| 962 | return ret; |
| 963 | } |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 964 | if (int ret = addLegacyRouteRules()) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 965 | return ret; |
| 966 | } |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 967 | if (int ret = addLocalNetworkRules(localNetId)) { |
| 968 | return ret; |
| 969 | } |
Lorenzo Colitti | a2c2305 | 2014-07-29 09:25:44 +0000 | [diff] [blame] | 970 | if (int ret = addDirectlyConnectedRule()) { |
| 971 | return ret; |
| 972 | } |
Sreeram Ramachandran | b717e74 | 2014-07-19 00:22:15 -0700 | [diff] [blame] | 973 | if (int ret = addUnreachableRule()) { |
| 974 | return ret; |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 975 | } |
Lorenzo Colitti | 3667936 | 2015-02-25 10:26:19 +0900 | [diff] [blame] | 976 | // Don't complain if we can't add the dummy network, since not all devices support it. |
| 977 | configureDummyNetwork(); |
| 978 | |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 979 | updateTableNamesFile(); |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 980 | return 0; |
Sreeram Ramachandran | 8fe9c8e | 2014-04-16 12:08:05 -0700 | [diff] [blame] | 981 | } |
| 982 | |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 983 | int RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 984 | return modifyLocalNetwork(netId, interface, ACTION_ADD); |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 985 | } |
| 986 | |
| 987 | int RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 988 | return modifyLocalNetwork(netId, interface, ACTION_DEL); |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 989 | } |
| 990 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 991 | int RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, |
| 992 | Permission permission) { |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 993 | if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { |
| 994 | return ret; |
| 995 | } |
| 996 | updateTableNamesFile(); |
| 997 | return 0; |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 998 | } |
| 999 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1000 | int RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, |
| 1001 | Permission permission) { |
| 1002 | if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 1003 | return ret; |
| 1004 | } |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 1005 | if (int ret = flushRoutes(interface)) { |
| 1006 | return ret; |
| 1007 | } |
Lorenzo Colitti | 6b6f25f | 2015-03-03 17:22:57 +0900 | [diff] [blame] | 1008 | if (int ret = clearTetheringRules(interface)) { |
| 1009 | return ret; |
| 1010 | } |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 1011 | updateTableNamesFile(); |
| 1012 | return 0; |
Sreeram Ramachandran | 379bd33 | 2014-04-10 19:58:06 -0700 | [diff] [blame] | 1013 | } |
| 1014 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1015 | int RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 1016 | bool secure, const UidRanges& uidRanges) { |
| 1017 | if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 1018 | MODIFY_NON_UID_BASED_RULES)) { |
| 1019 | return ret; |
| 1020 | } |
| 1021 | updateTableNamesFile(); |
| 1022 | return 0; |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 1023 | } |
| 1024 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1025 | int RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 1026 | bool secure, const UidRanges& uidRanges) { |
| 1027 | if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1028 | MODIFY_NON_UID_BASED_RULES)) { |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 1029 | return ret; |
| 1030 | } |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 1031 | if (int ret = flushRoutes(interface)) { |
| 1032 | return ret; |
| 1033 | } |
| 1034 | updateTableNamesFile(); |
| 1035 | return 0; |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 1036 | } |
| 1037 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1038 | int RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, |
| 1039 | Permission oldPermission, |
| 1040 | Permission newPermission) { |
Sreeram Ramachandran | 379bd33 | 2014-04-10 19:58:06 -0700 | [diff] [blame] | 1041 | // Add the new rules before deleting the old ones, to avoid race conditions. |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1042 | if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 1043 | return ret; |
| 1044 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1045 | return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 1046 | } |
| 1047 | |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 1048 | int RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure, |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1049 | const UidRanges& uidRanges) { |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 1050 | return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1051 | !MODIFY_NON_UID_BASED_RULES); |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 1052 | } |
| 1053 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1054 | int RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, |
Sreeram Ramachandran | 95684ba | 2014-07-23 13:27:31 -0700 | [diff] [blame] | 1055 | bool secure, const UidRanges& uidRanges) { |
| 1056 | return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1057 | !MODIFY_NON_UID_BASED_RULES); |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 1058 | } |
| 1059 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1060 | int RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { |
| 1061 | return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 1062 | } |
| 1063 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 1064 | int RouteController::removeInterfaceFromDefaultNetwork(const char* interface, |
| 1065 | Permission permission) { |
| 1066 | return modifyDefaultNetwork(RTM_DELRULE, interface, permission); |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 1067 | } |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 1068 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 1069 | int RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 1070 | TableType tableType) { |
| 1071 | return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 1072 | } |
| 1073 | |
Lorenzo Colitti | f7fc8ec | 2014-06-18 00:41:58 +0900 | [diff] [blame] | 1074 | int RouteController::removeRoute(const char* interface, const char* destination, |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 1075 | const char* nexthop, TableType tableType) { |
| 1076 | return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 1077 | } |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 1078 | |
| 1079 | int RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 1080 | return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface); |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 1081 | } |
| 1082 | |
| 1083 | int RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { |
Sreeram Ramachandran | fa9f4dc | 2014-07-22 18:16:44 -0700 | [diff] [blame] | 1084 | return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface); |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame] | 1085 | } |
Sreeram Ramachandran | 48e19b0 | 2014-07-22 22:23:20 -0700 | [diff] [blame] | 1086 | |
| 1087 | int RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface, |
| 1088 | Permission permission) { |
| 1089 | return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission); |
| 1090 | } |
| 1091 | |
| 1092 | int RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId, |
| 1093 | const char* physicalInterface, |
| 1094 | Permission permission) { |
| 1095 | return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission); |
| 1096 | } |