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 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 26#include <private/android_filesystem_config.h> 27 28#include <map> 29 30#include "DummyNetwork.h" 31#include "Fwmark.h" 32#include "NetdConstants.h" 33#include "NetlinkCommands.h" 34#include "UidRanges.h" 35 36#include "android-base/file.h" 37#include <android-base/stringprintf.h> 38#define LOG_TAG "Netd" 39#include "log/log.h" 40#include "logwrap/logwrap.h" 41#include "netutils/ifc.h" 42#include "resolv_netid.h" 43 44using android::base::StringPrintf; 45using android::base::WriteStringToFile; 46using android::net::UidRange; 47 48namespace android { 49namespace net { 50 51auto RouteController::iptablesRestoreCommandFunction = execIptablesRestoreCommand; 52 53// BEGIN CONSTANTS -------------------------------------------------------------------------------- 54 55const uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000; 56const uint32_t RULE_PRIORITY_VPN_OVERRIDE_OIF = 10500; 57const uint32_t RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL = 11000; 58const uint32_t RULE_PRIORITY_SECURE_VPN = 12000; 59const uint32_t RULE_PRIORITY_PROHIBIT_NON_VPN = 12500; 60const uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; 61const uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; 62const uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; 63const uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; 64const uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; 65const uint32_t RULE_PRIORITY_TETHERING = 18000; 66const uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000; 67const uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000; 68const uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000; 69const uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; 70const uint32_t RULE_PRIORITY_UNREACHABLE = 32000; 71 72const uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97; 73const uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98; 74const uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99; 75 76const char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network"; 77const char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network"; 78const char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system"; 79 80const char* const ROUTE_TABLE_NAME_LOCAL = "local"; 81const char* const ROUTE_TABLE_NAME_MAIN = "main"; 82 83// None of our regular routes specify priority, which causes them to have the default priority. 84// For default throw routes, we use a fixed priority of 100000. 85uint32_t PRIO_THROW = 100000; 86 87const char* const RouteController::LOCAL_MANGLE_INPUT = "routectrl_mangle_INPUT"; 88 89const uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; 90 91const uid_t UID_ROOT = 0; 92const uint32_t FWMARK_NONE = 0; 93const uint32_t MASK_NONE = 0; 94const char* const IIF_LOOPBACK = "lo"; 95const char* const IIF_NONE = NULL; 96const char* const OIF_NONE = NULL; 97const bool ACTION_ADD = true; 98const bool ACTION_DEL = false; 99const bool MODIFY_NON_UID_BASED_RULES = true; 100 101const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; 102const mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r-- 103 104// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" 105// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). 106constexpr uint16_t U16_RTA_LENGTH(uint16_t x) { 107 return RTA_LENGTH(x); 108} 109 110// These are practically const, but can't be declared so, because they are used to initialize 111// non-const pointers ("void* iov_base") in iovec arrays. 112rtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; 113rtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; 114rtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; 115rtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; 116rtattr FRATTR_UID_RANGE = { U16_RTA_LENGTH(sizeof(fib_rule_uid_range)), FRA_UID_RANGE }; 117 118rtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; 119rtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; 120rtattr RTATTR_PRIO = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_PRIORITY }; 121 122uint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; 123 124// END CONSTANTS ---------------------------------------------------------------------------------- 125 126const char *actionName(uint16_t action) { 127 static const char *ops[4] = {"adding", "deleting", "getting", "???"}; 128 return ops[action % 4]; 129} 130 131const char *familyName(uint8_t family) { 132 switch (family) { 133 case AF_INET: return "IPv4"; 134 case AF_INET6: return "IPv6"; 135 default: return "???"; 136 } 137} 138 139// Caller must hold sInterfaceToTableLock. 140uint32_t RouteController::getRouteTableForInterfaceLocked(const char* interface) { 141 uint32_t index = if_nametoindex(interface); 142 if (index) { 143 index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; 144 sInterfaceToTable[interface] = index; 145 return index; 146 } 147 // If the interface goes away if_nametoindex() will return 0 but we still need to know 148 // the index so we can remove the rules and routes. 149 auto iter = sInterfaceToTable.find(interface); 150 if (iter == sInterfaceToTable.end()) { 151 ALOGE("cannot find interface %s", interface); 152 return RT_TABLE_UNSPEC; 153 } 154 return iter->second; 155} 156 157uint32_t RouteController::getIfIndex(const char* interface) { 158 android::RWLock::AutoRLock lock(sInterfaceToTableLock); 159 160 auto iter = sInterfaceToTable.find(interface); 161 if (iter == sInterfaceToTable.end()) { 162 ALOGE("getIfIndex: cannot find interface %s", interface); 163 return 0; 164 } 165 166 return iter->second - ROUTE_TABLE_OFFSET_FROM_INDEX; 167} 168 169uint32_t RouteController::getRouteTableForInterface(const char* interface) { 170 android::RWLock::AutoRLock lock(sInterfaceToTableLock); 171 return getRouteTableForInterfaceLocked(interface); 172} 173 174void addTableName(uint32_t table, const std::string& name, std::string* contents) { 175 char tableString[UINT32_STRLEN]; 176 snprintf(tableString, sizeof(tableString), "%u", table); 177 *contents += tableString; 178 *contents += " "; 179 *contents += name; 180 *contents += "\n"; 181} 182 183// Doesn't return success/failure as the file is optional; it's okay if we fail to update it. 184void RouteController::updateTableNamesFile() { 185 std::string contents; 186 187 addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents); 188 addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents); 189 190 addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents); 191 addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); 192 addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); 193 194 android::RWLock::AutoRLock lock(sInterfaceToTableLock); 195 for (const auto& entry : sInterfaceToTable) { 196 addTableName(entry.second, entry.first, &contents); 197 } 198 199 if (!WriteStringToFile(contents, RT_TABLES_PATH, RT_TABLES_MODE, AID_SYSTEM, AID_WIFI)) { 200 ALOGE("failed to write to %s (%s)", RT_TABLES_PATH, strerror(errno)); 201 return; 202 } 203} 204 205// Returns 0 on success or negative errno on failure. 206int padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { 207 if (!input) { 208 *length = 0; 209 *padding = 0; 210 return 0; 211 } 212 *length = strlcpy(name, input, IFNAMSIZ) + 1; 213 if (*length > IFNAMSIZ) { 214 ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); 215 return -ENAMETOOLONG; 216 } 217 *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); 218 return 0; 219} 220 221// Adds or removes a routing rule for IPv4 and IPv6. 222// 223// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the table is 224// unspecified. An unspecified table is not allowed when creating an FR_ACT_TO_TBL rule. 225// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is 226// ignored. 227// + If |iif| is non-NULL, the rule matches the specified incoming interface. 228// + If |oif| is non-NULL, the rule matches the specified outgoing interface. 229// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that 230// range (inclusive). Otherwise, the rule matches packets from all UIDs. 231// 232// Returns 0 on success or negative errno on failure. 233WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint8_t ruleType, 234 uint32_t table, uint32_t fwmark, uint32_t mask, const char* iif, 235 const char* oif, uid_t uidStart, uid_t uidEnd) { 236 // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. 237 if (fwmark & ~mask) { 238 ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); 239 return -ERANGE; 240 } 241 242 // Interface names must include exactly one terminating NULL and be properly padded, or older 243 // kernels will refuse to delete rules. 244 char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; 245 size_t iifLength, oifLength; 246 uint16_t iifPadding, oifPadding; 247 if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { 248 return ret; 249 } 250 if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { 251 return ret; 252 } 253 254 // Either both start and end UID must be specified, or neither. 255 if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { 256 ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); 257 return -EUSERS; 258 } 259 260 bool isUidRule = (uidStart != INVALID_UID); 261 262 // Assemble a rule request and put it in an array of iovec structures. 263 fib_rule_hdr rule = { 264 .action = ruleType, 265 // Note that here we're implicitly setting rule.table to 0. When we want to specify a 266 // non-zero table, we do this via the FRATTR_TABLE attribute. 267 }; 268 269 // Don't ever create a rule that looks up table 0, because table 0 is the local table. 270 // It's OK to specify a table ID of 0 when deleting a rule, because that doesn't actually select 271 // table 0, it's a wildcard that matches anything. 272 if (table == RT_TABLE_UNSPEC && rule.action == FR_ACT_TO_TBL && action != RTM_DELRULE) { 273 ALOGE("RT_TABLE_UNSPEC only allowed when deleting rules"); 274 return -ENOTUNIQ; 275 } 276 277 rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; 278 rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; 279 struct fib_rule_uid_range uidRange = { uidStart, uidEnd }; 280 281 iovec iov[] = { 282 { NULL, 0 }, 283 { &rule, sizeof(rule) }, 284 { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, 285 { &priority, sizeof(priority) }, 286 { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, 287 { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, 288 { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, 289 { &fwmark, mask ? sizeof(fwmark) : 0 }, 290 { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, 291 { &mask, mask ? sizeof(mask) : 0 }, 292 { &FRATTR_UID_RANGE, isUidRule ? sizeof(FRATTR_UID_RANGE) : 0 }, 293 { &uidRange, isUidRule ? sizeof(uidRange) : 0 }, 294 { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, 295 { iifName, iifLength }, 296 { PADDING_BUFFER, iifPadding }, 297 { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, 298 { oifName, oifLength }, 299 { PADDING_BUFFER, oifPadding }, 300 }; 301 302 uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_RULE_CREATE_FLAGS : NETLINK_REQUEST_FLAGS; 303 for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { 304 rule.family = AF_FAMILIES[i]; 305 if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov), nullptr)) { 306 if (!(action == RTM_DELRULE && ret == -ENOENT && priority == RULE_PRIORITY_TETHERING)) { 307 // Don't log when deleting a tethering rule that's not there. This matches the 308 // behaviour of clearTetheringRules, which ignores ENOENT in this case. 309 ALOGE("Error %s %s rule: %s", actionName(action), familyName(rule.family), 310 strerror(-ret)); 311 } 312 return ret; 313 } 314 } 315 316 return 0; 317} 318 319WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 320 uint32_t fwmark, uint32_t mask, const char* iif, 321 const char* oif, uid_t uidStart, uid_t uidEnd) { 322 return modifyIpRule(action, priority, FR_ACT_TO_TBL, table, fwmark, mask, iif, oif, uidStart, 323 uidEnd); 324} 325 326WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, 327 uint32_t fwmark, uint32_t mask) { 328 return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, 329 INVALID_UID); 330} 331 332// Adds or deletes an IPv4 or IPv6 route. 333// Returns 0 on success or negative errno on failure. 334WARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, 335 const char* destination, const char* nexthop) { 336 // At least the destination must be non-null. 337 if (!destination) { 338 ALOGE("null destination"); 339 return -EFAULT; 340 } 341 342 // Parse the prefix. 343 uint8_t rawAddress[sizeof(in6_addr)]; 344 uint8_t family; 345 uint8_t prefixLength; 346 int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), 347 &prefixLength); 348 if (rawLength < 0) { 349 ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); 350 return rawLength; 351 } 352 353 if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { 354 ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); 355 return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. 356 } 357 358 uint8_t type = RTN_UNICAST; 359 uint32_t ifindex; 360 uint8_t rawNexthop[sizeof(in6_addr)]; 361 362 if (nexthop && !strcmp(nexthop, "unreachable")) { 363 type = RTN_UNREACHABLE; 364 // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup 365 // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for 366 // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.) 367 interface = OIF_NONE; 368 nexthop = NULL; 369 } else if (nexthop && !strcmp(nexthop, "throw")) { 370 type = RTN_THROW; 371 interface = OIF_NONE; 372 nexthop = NULL; 373 } else { 374 // If an interface was specified, find the ifindex. 375 if (interface != OIF_NONE) { 376 ifindex = if_nametoindex(interface); 377 if (!ifindex) { 378 ALOGE("cannot find interface %s", interface); 379 return -ENODEV; 380 } 381 } 382 383 // If a nexthop was specified, parse it as the same family as the prefix. 384 if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { 385 ALOGE("inet_pton failed for nexthop %s", nexthop); 386 return -EINVAL; 387 } 388 } 389 390 bool isDefaultThrowRoute = (type == RTN_THROW && prefixLength == 0); 391 392 // Assemble a rtmsg and put it in an array of iovec structures. 393 rtmsg route = { 394 .rtm_protocol = RTPROT_STATIC, 395 .rtm_type = type, 396 .rtm_family = family, 397 .rtm_dst_len = prefixLength, 398 .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK), 399 }; 400 401 rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; 402 rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; 403 404 iovec iov[] = { 405 { NULL, 0 }, 406 { &route, sizeof(route) }, 407 { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, 408 { &table, sizeof(table) }, 409 { &rtaDst, sizeof(rtaDst) }, 410 { rawAddress, static_cast<size_t>(rawLength) }, 411 { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, 412 { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, 413 { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, 414 { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, 415 { &RTATTR_PRIO, isDefaultThrowRoute ? sizeof(RTATTR_PRIO) : 0 }, 416 { &PRIO_THROW, isDefaultThrowRoute ? sizeof(PRIO_THROW) : 0 }, 417 }; 418 419 uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_ROUTE_CREATE_FLAGS : NETLINK_REQUEST_FLAGS; 420 int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov), nullptr); 421 if (ret) { 422 ALOGE("Error %s route %s -> %s %s to table %u: %s", 423 actionName(action), destination, nexthop, interface, table, strerror(-ret)); 424 } 425 return ret; 426} 427 428// An iptables rule to mark incoming packets on a network with the netId of the network. 429// 430// This is so that the kernel can: 431// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping 432// replies, SYN-ACKs, etc). 433// + Mark sockets that accept connections from this interface so that the connection stays on the 434// same interface. 435WARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, 436 Permission permission, bool add) { 437 Fwmark fwmark; 438 439 fwmark.netId = netId; 440 fwmark.explicitlySelected = true; 441 fwmark.protectedFromVpn = true; 442 fwmark.permission = permission; 443 444 const uint32_t mask = ~Fwmark::getUidBillingMask(); 445 446 std::string cmd = StringPrintf( 447 "%s %s -i %s -j MARK --set-mark 0x%x/0x%x", add ? "-A" : "-D", 448 RouteController::LOCAL_MANGLE_INPUT, interface, fwmark.intValue, mask); 449 if (RouteController::iptablesRestoreCommandFunction(V4V6, "mangle", cmd, nullptr) != 0) { 450 ALOGE("failed to change iptables rule that sets incoming packet mark"); 451 return -EREMOTEIO; 452 } 453 454 return 0; 455} 456 457// A rule to route responses to the local network forwarded via the VPN. 458// 459// When a VPN is in effect, packets from the local network to upstream networks are forwarded into 460// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel. 461WARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) { 462 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL, 463 ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE, 464 INVALID_UID, INVALID_UID); 465} 466 467// A rule to route all traffic from a given set of UIDs to go over the VPN. 468// 469// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may 470// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to 471// bypass the VPN if the protectedFromVpn bit is set. 472WARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, 473 bool secure, bool add) { 474 Fwmark fwmark; 475 Fwmark mask; 476 477 fwmark.protectedFromVpn = false; 478 mask.protectedFromVpn = true; 479 480 uint32_t priority; 481 482 if (secure) { 483 priority = RULE_PRIORITY_SECURE_VPN; 484 } else { 485 priority = RULE_PRIORITY_BYPASSABLE_VPN; 486 487 fwmark.explicitlySelected = false; 488 mask.explicitlySelected = true; 489 } 490 491 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 492 mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd); 493} 494 495// A rule to allow system apps to send traffic over this VPN even if they are not part of the target 496// set of UIDs. 497// 498// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the 499// target set, but where the DnsProxyListener itself is not. 500WARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure, 501 bool add) { 502 Fwmark fwmark; 503 Fwmark mask; 504 505 fwmark.netId = netId; 506 mask.netId = FWMARK_NET_ID_MASK; 507 508 fwmark.permission = PERMISSION_SYSTEM; 509 mask.permission = PERMISSION_SYSTEM; 510 511 uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN; 512 513 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue, 514 mask.intValue); 515} 516 517// A rule to route traffic based on an explicitly chosen network. 518// 519// Supports apps that use the multinetwork APIs to restrict their traffic to a network. 520// 521// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need 522// to check it again in the rules here, because a network's permissions may have been updated via 523// modifyNetworkPermission(). 524WARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, 525 Permission permission, uid_t uidStart, 526 uid_t uidEnd, bool add) { 527 Fwmark fwmark; 528 Fwmark mask; 529 530 fwmark.netId = netId; 531 mask.netId = FWMARK_NET_ID_MASK; 532 533 fwmark.explicitlySelected = true; 534 mask.explicitlySelected = true; 535 536 fwmark.permission = permission; 537 mask.permission = permission; 538 539 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, 540 fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd); 541} 542 543// A rule to route traffic based on a chosen outgoing interface. 544// 545// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows 546// the outgoing interface (typically for link-local communications). 547WARN_UNUSED_RESULT int modifyOutputInterfaceRules(const char* interface, uint32_t table, 548 Permission permission, uid_t uidStart, 549 uid_t uidEnd, bool add) { 550 Fwmark fwmark; 551 Fwmark mask; 552 553 fwmark.permission = permission; 554 mask.permission = permission; 555 556 // If this rule does not specify a UID range, then also add a corresponding high-priority rule 557 // for root. This covers kernel-originated packets, TEEd packets and any local daemons that open 558 // sockets as root. 559 if (uidStart == INVALID_UID && uidEnd == INVALID_UID) { 560 if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OVERRIDE_OIF, 561 table, FWMARK_NONE, MASK_NONE, IIF_LOOPBACK, interface, 562 UID_ROOT, UID_ROOT)) { 563 return ret; 564 } 565 } 566 567 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, 568 fwmark.intValue, mask.intValue, IIF_LOOPBACK, interface, uidStart, uidEnd); 569} 570 571// A rule to route traffic based on the chosen network. 572// 573// This is for sockets that have not explicitly requested a particular network, but have been 574// bound to one when they called connect(). This ensures that sockets connected on a particular 575// network stay on that network even if the default network changes. 576WARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, bool add) { 577 Fwmark fwmark; 578 Fwmark mask; 579 580 fwmark.netId = netId; 581 mask.netId = FWMARK_NET_ID_MASK; 582 583 fwmark.explicitlySelected = false; 584 mask.explicitlySelected = true; 585 586 fwmark.permission = PERMISSION_NONE; 587 mask.permission = PERMISSION_NONE; 588 589 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, 590 fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, INVALID_UID, 591 INVALID_UID); 592} 593 594// A rule to enable split tunnel VPNs. 595// 596// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to 597// go over the default network, provided it wasn't explicitly restricted to the VPN and has the 598// permissions required by the default network. 599WARN_UNUSED_RESULT int RouteController::modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId, 600 const char* physicalInterface, 601 Permission permission) { 602 uint32_t table = getRouteTableForInterface(physicalInterface); 603 if (table == RT_TABLE_UNSPEC) { 604 return -ESRCH; 605 } 606 607 Fwmark fwmark; 608 Fwmark mask; 609 610 fwmark.netId = vpnNetId; 611 mask.netId = FWMARK_NET_ID_MASK; 612 613 fwmark.explicitlySelected = false; 614 mask.explicitlySelected = true; 615 616 fwmark.permission = permission; 617 mask.permission = permission; 618 619 return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue, 620 mask.intValue); 621} 622 623// Add rules to allow legacy routes added through the requestRouteToHost() API. 624WARN_UNUSED_RESULT int addLegacyRouteRules() { 625 Fwmark fwmark; 626 Fwmark mask; 627 628 fwmark.explicitlySelected = false; 629 mask.explicitlySelected = true; 630 631 // Rules to allow legacy routes to override the default network. 632 if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 633 fwmark.intValue, mask.intValue)) { 634 return ret; 635 } 636 if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, 637 ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { 638 return ret; 639 } 640 641 fwmark.permission = PERMISSION_SYSTEM; 642 mask.permission = PERMISSION_SYSTEM; 643 644 // A rule to allow legacy routes from system apps to override VPNs. 645 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, 646 fwmark.intValue, mask.intValue); 647} 648 649// Add rules to lookup the local network when specified explicitly or otherwise. 650WARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) { 651 if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 652 INVALID_UID, INVALID_UID, ACTION_ADD)) { 653 return ret; 654 } 655 656 Fwmark fwmark; 657 Fwmark mask; 658 659 fwmark.explicitlySelected = false; 660 mask.explicitlySelected = true; 661 662 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, 663 fwmark.intValue, mask.intValue); 664} 665 666/* static */ 667int RouteController::configureDummyNetwork() { 668 const char *interface = DummyNetwork::INTERFACE_NAME; 669 uint32_t table = getRouteTableForInterface(interface); 670 if (table == RT_TABLE_UNSPEC) { 671 // getRouteTableForInterface has already looged an error. 672 return -ESRCH; 673 } 674 675 ifc_init(); 676 int ret = ifc_up(interface); 677 ifc_close(); 678 if (ret) { 679 ALOGE("Can't bring up %s: %s", interface, strerror(errno)); 680 return -errno; 681 } 682 683 if ((ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, 684 INVALID_UID, INVALID_UID, ACTION_ADD))) { 685 ALOGE("Can't create oif rules for %s: %s", interface, strerror(-ret)); 686 return ret; 687 } 688 689 if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "0.0.0.0/0", NULL))) { 690 return ret; 691 } 692 693 if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "::/0", NULL))) { 694 return ret; 695 } 696 697 return 0; 698} 699 700// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that 701// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended 702// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable 703// rule will hopefully make things even clearer. 704WARN_UNUSED_RESULT int addUnreachableRule() { 705 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, FR_ACT_UNREACHABLE, RT_TABLE_UNSPEC, 706 MARK_UNSET, MARK_UNSET, IIF_NONE, OIF_NONE, INVALID_UID, INVALID_UID); 707} 708 709WARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { 710 if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 711 return ret; 712 } 713 return modifyOutputInterfaceRules(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, 714 INVALID_UID, INVALID_UID, add); 715} 716 717/* static */ 718WARN_UNUSED_RESULT int RouteController::modifyPhysicalNetwork(unsigned netId, const char* interface, 719 Permission permission, bool add) { 720 uint32_t table = getRouteTableForInterface(interface); 721 if (table == RT_TABLE_UNSPEC) { 722 return -ESRCH; 723 } 724 725 if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { 726 return ret; 727 } 728 if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, 729 add)) { 730 return ret; 731 } 732 if (int ret = modifyOutputInterfaceRules(interface, table, permission, INVALID_UID, INVALID_UID, 733 add)) { 734 return ret; 735 } 736 737 // Only set implicit rules for networks that don't require permissions. 738 // 739 // This is so that if the default network ceases to be the default network and then switches 740 // from requiring no permissions to requiring permissions, we ensure that apps only use the 741 // network if they explicitly select it. This is consistent with destroySocketsLackingPermission 742 // - it closes all sockets on the network except sockets that are explicitly selected. 743 // 744 // The lack of this rule only affects the special case above, because: 745 // - The only cases where we implicitly bind a socket to a network are the default network and 746 // the bypassable VPN that applies to the app, if any. 747 // - This rule doesn't affect VPNs because they don't support permissions at all. 748 // - The default network doesn't require permissions. While we support doing this, the framework 749 // never does it (partly because we'd end up in the situation where we tell apps that there is 750 // a default network, but they can't use it). 751 // - If the network is still the default network, the presence or absence of this rule does not 752 // matter. 753 // 754 // Therefore, for the lack of this rule to affect a socket, the socket has to have been 755 // implicitly bound to a network because at the time of connect() it was the default, and that 756 // network must no longer be the default, and must now require permissions. 757 if (permission == PERMISSION_NONE) { 758 return modifyImplicitNetworkRule(netId, table, add); 759 } 760 return 0; 761} 762 763WARN_UNUSED_RESULT int modifyRejectNonSecureNetworkRule(const UidRanges& uidRanges, bool add) { 764 Fwmark fwmark; 765 Fwmark mask; 766 fwmark.protectedFromVpn = false; 767 mask.protectedFromVpn = true; 768 769 for (const UidRange& range : uidRanges.getRanges()) { 770 if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, 771 RULE_PRIORITY_PROHIBIT_NON_VPN, FR_ACT_PROHIBIT, RT_TABLE_UNSPEC, 772 fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, 773 range.getStart(), range.getStop())) { 774 return ret; 775 } 776 } 777 778 return 0; 779} 780 781WARN_UNUSED_RESULT int RouteController::modifyVirtualNetwork(unsigned netId, const char* interface, 782 const UidRanges& uidRanges, 783 bool secure, bool add, 784 bool modifyNonUidBasedRules) { 785 uint32_t table = getRouteTableForInterface(interface); 786 if (table == RT_TABLE_UNSPEC) { 787 return -ESRCH; 788 } 789 790 for (const UidRange& range : uidRanges.getRanges()) { 791 if (int ret = modifyVpnUidRangeRule(table, range.getStart(), range.getStop(), secure, add)) 792 { 793 return ret; 794 } 795 if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.getStart(), 796 range.getStop(), add)) { 797 return ret; 798 } 799 if (int ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, 800 range.getStart(), range.getStop(), add)) { 801 return ret; 802 } 803 } 804 805 if (modifyNonUidBasedRules) { 806 if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { 807 return ret; 808 } 809 if (int ret = modifyVpnOutputToLocalRule(interface, add)) { 810 return ret; 811 } 812 if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) { 813 return ret; 814 } 815 return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add); 816 } 817 818 return 0; 819} 820 821WARN_UNUSED_RESULT int RouteController::modifyDefaultNetwork(uint16_t action, const char* interface, 822 Permission permission) { 823 uint32_t table = getRouteTableForInterface(interface); 824 if (table == RT_TABLE_UNSPEC) { 825 return -ESRCH; 826 } 827 828 Fwmark fwmark; 829 Fwmark mask; 830 831 fwmark.netId = NETID_UNSET; 832 mask.netId = FWMARK_NET_ID_MASK; 833 834 fwmark.permission = permission; 835 mask.permission = permission; 836 837 return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, 838 mask.intValue, IIF_LOOPBACK, OIF_NONE, INVALID_UID, INVALID_UID); 839} 840 841WARN_UNUSED_RESULT int RouteController::modifyTetheredNetwork(uint16_t action, 842 const char* inputInterface, 843 const char* outputInterface) { 844 uint32_t table = getRouteTableForInterface(outputInterface); 845 if (table == RT_TABLE_UNSPEC) { 846 return -ESRCH; 847 } 848 849 return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, 850 inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 851} 852 853// Adds or removes an IPv4 or IPv6 route to the specified table. 854// Returns 0 on success or negative errno on failure. 855WARN_UNUSED_RESULT int RouteController::modifyRoute(uint16_t action, const char* interface, 856 const char* destination, const char* nexthop, 857 TableType tableType) { 858 uint32_t table; 859 switch (tableType) { 860 case RouteController::INTERFACE: { 861 table = getRouteTableForInterface(interface); 862 if (table == RT_TABLE_UNSPEC) { 863 return -ESRCH; 864 } 865 break; 866 } 867 case RouteController::LOCAL_NETWORK: { 868 table = ROUTE_TABLE_LOCAL_NETWORK; 869 break; 870 } 871 case RouteController::LEGACY_NETWORK: { 872 table = ROUTE_TABLE_LEGACY_NETWORK; 873 break; 874 } 875 case RouteController::LEGACY_SYSTEM: { 876 table = ROUTE_TABLE_LEGACY_SYSTEM; 877 break; 878 } 879 } 880 881 int ret = modifyIpRoute(action, table, interface, destination, nexthop); 882 // Trying to add a route that already exists shouldn't cause an error. 883 if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { 884 return ret; 885 } 886 887 return 0; 888} 889 890WARN_UNUSED_RESULT int clearTetheringRules(const char* inputInterface) { 891 int ret = 0; 892 while (ret == 0) { 893 ret = modifyIpRule(RTM_DELRULE, RULE_PRIORITY_TETHERING, 0, MARK_UNSET, MARK_UNSET, 894 inputInterface, OIF_NONE, INVALID_UID, INVALID_UID); 895 } 896 897 if (ret == -ENOENT) { 898 return 0; 899 } else { 900 return ret; 901 } 902} 903 904uint32_t getRulePriority(const nlmsghdr *nlh) { 905 return getRtmU32Attribute(nlh, FRA_PRIORITY); 906} 907 908uint32_t getRouteTable(const nlmsghdr *nlh) { 909 return getRtmU32Attribute(nlh, RTA_TABLE); 910} 911 912WARN_UNUSED_RESULT int flushRules() { 913 NetlinkDumpFilter shouldDelete = [] (nlmsghdr *nlh) { 914 // Don't touch rules at priority 0 because by default they are used for local input. 915 return getRulePriority(nlh) != 0; 916 }; 917 return rtNetlinkFlush(RTM_GETRULE, RTM_DELRULE, "rules", shouldDelete); 918} 919 920WARN_UNUSED_RESULT int RouteController::flushRoutes(uint32_t table) { 921 NetlinkDumpFilter shouldDelete = [table] (nlmsghdr *nlh) { 922 return getRouteTable(nlh) == table; 923 }; 924 925 return rtNetlinkFlush(RTM_GETROUTE, RTM_DELROUTE, "routes", shouldDelete); 926} 927 928// Returns 0 on success or negative errno on failure. 929WARN_UNUSED_RESULT int RouteController::flushRoutes(const char* interface) { 930 android::RWLock::AutoWLock lock(sInterfaceToTableLock); 931 932 uint32_t table = getRouteTableForInterfaceLocked(interface); 933 if (table == RT_TABLE_UNSPEC) { 934 return -ESRCH; 935 } 936 937 int ret = flushRoutes(table); 938 939 // If we failed to flush routes, the caller may elect to keep this interface around, so keep 940 // track of its name. 941 if (ret == 0) { 942 sInterfaceToTable.erase(interface); 943 } 944 945 return ret; 946} 947 948int RouteController::Init(unsigned localNetId) { 949 if (int ret = flushRules()) { 950 return ret; 951 } 952 if (int ret = addLegacyRouteRules()) { 953 return ret; 954 } 955 if (int ret = addLocalNetworkRules(localNetId)) { 956 return ret; 957 } 958 if (int ret = addUnreachableRule()) { 959 return ret; 960 } 961 // Don't complain if we can't add the dummy network, since not all devices support it. 962 configureDummyNetwork(); 963 964 updateTableNamesFile(); 965 return 0; 966} 967 968int RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { 969 return modifyLocalNetwork(netId, interface, ACTION_ADD); 970} 971 972int RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { 973 return modifyLocalNetwork(netId, interface, ACTION_DEL); 974} 975 976int RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, 977 Permission permission) { 978 if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { 979 return ret; 980 } 981 updateTableNamesFile(); 982 return 0; 983} 984 985int RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, 986 Permission permission) { 987 if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { 988 return ret; 989 } 990 if (int ret = flushRoutes(interface)) { 991 return ret; 992 } 993 if (int ret = clearTetheringRules(interface)) { 994 return ret; 995 } 996 updateTableNamesFile(); 997 return 0; 998} 999 1000int RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, 1001 bool secure, const UidRanges& uidRanges) { 1002 if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 1003 MODIFY_NON_UID_BASED_RULES)) { 1004 return ret; 1005 } 1006 updateTableNamesFile(); 1007 return 0; 1008} 1009 1010int RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, 1011 bool secure, const UidRanges& uidRanges) { 1012 if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 1013 MODIFY_NON_UID_BASED_RULES)) { 1014 return ret; 1015 } 1016 if (int ret = flushRoutes(interface)) { 1017 return ret; 1018 } 1019 updateTableNamesFile(); 1020 return 0; 1021} 1022 1023int RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, 1024 Permission oldPermission, 1025 Permission newPermission) { 1026 // Add the new rules before deleting the old ones, to avoid race conditions. 1027 if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { 1028 return ret; 1029 } 1030 return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); 1031} 1032 1033int RouteController::addUsersToRejectNonSecureNetworkRule(const UidRanges& uidRanges) { 1034 return modifyRejectNonSecureNetworkRule(uidRanges, true); 1035} 1036 1037int RouteController::removeUsersFromRejectNonSecureNetworkRule(const UidRanges& uidRanges) { 1038 return modifyRejectNonSecureNetworkRule(uidRanges, false); 1039} 1040 1041int RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure, 1042 const UidRanges& uidRanges) { 1043 return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD, 1044 !MODIFY_NON_UID_BASED_RULES); 1045} 1046 1047int RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, 1048 bool secure, const UidRanges& uidRanges) { 1049 return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL, 1050 !MODIFY_NON_UID_BASED_RULES); 1051} 1052 1053int RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { 1054 return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); 1055} 1056 1057int RouteController::removeInterfaceFromDefaultNetwork(const char* interface, 1058 Permission permission) { 1059 return modifyDefaultNetwork(RTM_DELRULE, interface, permission); 1060} 1061 1062int RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, 1063 TableType tableType) { 1064 return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); 1065} 1066 1067int RouteController::removeRoute(const char* interface, const char* destination, 1068 const char* nexthop, TableType tableType) { 1069 return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); 1070} 1071 1072int RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { 1073 return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface); 1074} 1075 1076int RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { 1077 return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface); 1078} 1079 1080int RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface, 1081 Permission permission) { 1082 return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission); 1083} 1084 1085int RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId, 1086 const char* physicalInterface, 1087 Permission permission) { 1088 return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission); 1089} 1090 1091// Protects sInterfaceToTable. 1092android::RWLock RouteController::sInterfaceToTableLock; 1093 1094std::map<std::string, uint32_t> RouteController::sInterfaceToTable; 1095 1096} // namespace net 1097} // namespace android 1098