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 #define LOG_TAG "Netd"
31
32 #include "DummyNetwork.h"
33 #include "Fwmark.h"
34 #include "NetdConstants.h"
35 #include "NetlinkCommands.h"
36 #include "UidRanges.h"
37
38 #include <android-base/file.h>
39 #include <android-base/stringprintf.h>
40 #include "log/log.h"
41 #include "logwrap/logwrap.h"
42 #include "netid_client.h"
43 #include "netutils/ifc.h"
44
45 using android::base::StringPrintf;
46 using android::base::WriteStringToFile;
47 using android::net::UidRangeParcel;
48
49 namespace android {
50 namespace net {
51
52 auto RouteController::iptablesRestoreCommandFunction = execIptablesRestoreCommand;
53
54 // BEGIN CONSTANTS --------------------------------------------------------------------------------
55
56 const uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000;
57 const uint32_t RULE_PRIORITY_VPN_OVERRIDE_OIF = 10500;
58 const uint32_t RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL = 11000;
59 const uint32_t RULE_PRIORITY_SECURE_VPN = 12000;
60 const uint32_t RULE_PRIORITY_PROHIBIT_NON_VPN = 12500;
61 const uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000;
62 const uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000;
63 const uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000;
64 const uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000;
65 const uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000;
66 const uint32_t RULE_PRIORITY_TETHERING = 18000;
67 const uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000;
68 const uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000;
69 const uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000;
70 const uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000;
71 const uint32_t RULE_PRIORITY_UNREACHABLE = 32000;
72
73 const uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97;
74 const uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98;
75 const uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99;
76
77 const char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network";
78 const char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network";
79 const char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system";
80
81 const char* const ROUTE_TABLE_NAME_LOCAL = "local";
82 const char* const ROUTE_TABLE_NAME_MAIN = "main";
83
84 // None of our regular routes specify priority, which causes them to have the default priority.
85 // For default throw routes, we use a fixed priority of 100000.
86 uint32_t PRIO_THROW = 100000;
87
88 const char* const RouteController::LOCAL_MANGLE_INPUT = "routectrl_mangle_INPUT";
89
90 const uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6};
91
92 const uid_t UID_ROOT = 0;
93 const uint32_t FWMARK_NONE = 0;
94 const uint32_t MASK_NONE = 0;
95 const char* const IIF_LOOPBACK = "lo";
96 const char* const IIF_NONE = nullptr;
97 const char* const OIF_NONE = nullptr;
98 const bool ACTION_ADD = true;
99 const bool ACTION_DEL = false;
100 const bool MODIFY_NON_UID_BASED_RULES = true;
101
102 const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables";
103 const mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r--
104
105 // Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'"
106 // warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t).
U16_RTA_LENGTH(uint16_t x)107 constexpr uint16_t U16_RTA_LENGTH(uint16_t x) {
108 return RTA_LENGTH(x);
109 }
110
111 // These are practically const, but can't be declared so, because they are used to initialize
112 // non-const pointers ("void* iov_base") in iovec arrays.
113 rtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY };
114 rtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE };
115 rtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK };
116 rtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK };
117 rtattr FRATTR_UID_RANGE = { U16_RTA_LENGTH(sizeof(fib_rule_uid_range)), FRA_UID_RANGE };
118
119 rtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE };
120 rtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF };
121 rtattr RTATTR_PRIO = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_PRIORITY };
122
123 uint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0};
124
125 // END CONSTANTS ----------------------------------------------------------------------------------
126
actionName(uint16_t action)127 const char *actionName(uint16_t action) {
128 static const char *ops[4] = {"adding", "deleting", "getting", "???"};
129 return ops[action % 4];
130 }
131
familyName(uint8_t family)132 const char *familyName(uint8_t family) {
133 switch (family) {
134 case AF_INET: return "IPv4";
135 case AF_INET6: return "IPv6";
136 default: return "???";
137 }
138 }
139
140 // Caller must hold sInterfaceToTableLock.
getRouteTableForInterfaceLocked(const char * interface)141 uint32_t RouteController::getRouteTableForInterfaceLocked(const char* interface) {
142 uint32_t index = if_nametoindex(interface);
143 if (index) {
144 index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX;
145 sInterfaceToTable[interface] = index;
146 return index;
147 }
148 // If the interface goes away if_nametoindex() will return 0 but we still need to know
149 // the index so we can remove the rules and routes.
150 auto iter = sInterfaceToTable.find(interface);
151 if (iter == sInterfaceToTable.end()) {
152 ALOGE("cannot find interface %s", interface);
153 return RT_TABLE_UNSPEC;
154 }
155 return iter->second;
156 }
157
getIfIndex(const char * interface)158 uint32_t RouteController::getIfIndex(const char* interface) {
159 std::lock_guard lock(sInterfaceToTableLock);
160
161 auto iter = sInterfaceToTable.find(interface);
162 if (iter == sInterfaceToTable.end()) {
163 ALOGE("getIfIndex: cannot find interface %s", interface);
164 return 0;
165 }
166
167 return iter->second - ROUTE_TABLE_OFFSET_FROM_INDEX;
168 }
169
getRouteTableForInterface(const char * interface)170 uint32_t RouteController::getRouteTableForInterface(const char* interface) {
171 std::lock_guard lock(sInterfaceToTableLock);
172 return getRouteTableForInterfaceLocked(interface);
173 }
174
addTableName(uint32_t table,const std::string & name,std::string * contents)175 void addTableName(uint32_t table, const std::string& name, std::string* contents) {
176 char tableString[UINT32_STRLEN];
177 snprintf(tableString, sizeof(tableString), "%u", table);
178 *contents += tableString;
179 *contents += " ";
180 *contents += name;
181 *contents += "\n";
182 }
183
184 // Doesn't return success/failure as the file is optional; it's okay if we fail to update it.
updateTableNamesFile()185 void RouteController::updateTableNamesFile() {
186 std::string contents;
187
188 addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents);
189 addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents);
190
191 addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents);
192 addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents);
193 addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents);
194
195 std::lock_guard lock(sInterfaceToTableLock);
196 for (const auto& entry : sInterfaceToTable) {
197 addTableName(entry.second, entry.first, &contents);
198 }
199
200 if (!WriteStringToFile(contents, RT_TABLES_PATH, RT_TABLES_MODE, AID_SYSTEM, AID_WIFI)) {
201 ALOGE("failed to write to %s (%s)", RT_TABLES_PATH, strerror(errno));
202 return;
203 }
204 }
205
206 // Returns 0 on success or negative errno on failure.
padInterfaceName(const char * input,char * name,size_t * length,uint16_t * padding)207 int padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) {
208 if (!input) {
209 *length = 0;
210 *padding = 0;
211 return 0;
212 }
213 *length = strlcpy(name, input, IFNAMSIZ) + 1;
214 if (*length > IFNAMSIZ) {
215 ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ);
216 return -ENAMETOOLONG;
217 }
218 *padding = RTA_SPACE(*length) - RTA_LENGTH(*length);
219 return 0;
220 }
221
222 // Adds or removes a routing rule for IPv4 and IPv6.
223 //
224 // + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the table is
225 // unspecified. An unspecified table is not allowed when creating an FR_ACT_TO_TBL rule.
226 // + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is
227 // ignored.
228 // + If |iif| is non-NULL, the rule matches the specified incoming interface.
229 // + If |oif| is non-NULL, the rule matches the specified outgoing interface.
230 // + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that
231 // range (inclusive). Otherwise, the rule matches packets from all UIDs.
232 //
233 // Returns 0 on success or negative errno on failure.
modifyIpRule(uint16_t action,uint32_t priority,uint8_t ruleType,uint32_t table,uint32_t fwmark,uint32_t mask,const char * iif,const char * oif,uid_t uidStart,uid_t uidEnd)234 WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint8_t ruleType,
235 uint32_t table, uint32_t fwmark, uint32_t mask, const char* iif,
236 const char* oif, uid_t uidStart, uid_t uidEnd) {
237 // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask.
238 if (fwmark & ~mask) {
239 ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark);
240 return -ERANGE;
241 }
242
243 // Interface names must include exactly one terminating NULL and be properly padded, or older
244 // kernels will refuse to delete rules.
245 char iifName[IFNAMSIZ], oifName[IFNAMSIZ];
246 size_t iifLength, oifLength;
247 uint16_t iifPadding, oifPadding;
248 if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) {
249 return ret;
250 }
251 if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) {
252 return ret;
253 }
254
255 // Either both start and end UID must be specified, or neither.
256 if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) {
257 ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd);
258 return -EUSERS;
259 }
260
261 bool isUidRule = (uidStart != INVALID_UID);
262
263 // Assemble a rule request and put it in an array of iovec structures.
264 fib_rule_hdr rule = {
265 .action = ruleType,
266 // Note that here we're implicitly setting rule.table to 0. When we want to specify a
267 // non-zero table, we do this via the FRATTR_TABLE attribute.
268 };
269
270 // Don't ever create a rule that looks up table 0, because table 0 is the local table.
271 // It's OK to specify a table ID of 0 when deleting a rule, because that doesn't actually select
272 // table 0, it's a wildcard that matches anything.
273 if (table == RT_TABLE_UNSPEC && rule.action == FR_ACT_TO_TBL && action != RTM_DELRULE) {
274 ALOGE("RT_TABLE_UNSPEC only allowed when deleting rules");
275 return -ENOTUNIQ;
276 }
277
278 rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME };
279 rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME };
280 struct fib_rule_uid_range uidRange = { uidStart, uidEnd };
281
282 iovec iov[] = {
283 { nullptr, 0 },
284 { &rule, sizeof(rule) },
285 { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) },
286 { &priority, sizeof(priority) },
287 { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 },
288 { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 },
289 { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 },
290 { &fwmark, mask ? sizeof(fwmark) : 0 },
291 { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 },
292 { &mask, mask ? sizeof(mask) : 0 },
293 { &FRATTR_UID_RANGE, isUidRule ? sizeof(FRATTR_UID_RANGE) : 0 },
294 { &uidRange, isUidRule ? sizeof(uidRange) : 0 },
295 { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 },
296 { iifName, iifLength },
297 { PADDING_BUFFER, iifPadding },
298 { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 },
299 { oifName, oifLength },
300 { PADDING_BUFFER, oifPadding },
301 };
302
303 uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_RULE_CREATE_FLAGS : NETLINK_REQUEST_FLAGS;
304 for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) {
305 rule.family = AF_FAMILIES[i];
306 if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov), nullptr)) {
307 if (!(action == RTM_DELRULE && ret == -ENOENT && priority == RULE_PRIORITY_TETHERING)) {
308 // Don't log when deleting a tethering rule that's not there. This matches the
309 // behaviour of clearTetheringRules, which ignores ENOENT in this case.
310 ALOGE("Error %s %s rule: %s", actionName(action), familyName(rule.family),
311 strerror(-ret));
312 }
313 return ret;
314 }
315 }
316
317 return 0;
318 }
319
modifyIpRule(uint16_t action,uint32_t priority,uint32_t table,uint32_t fwmark,uint32_t mask,const char * iif,const char * oif,uid_t uidStart,uid_t uidEnd)320 WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table,
321 uint32_t fwmark, uint32_t mask, const char* iif,
322 const char* oif, uid_t uidStart, uid_t uidEnd) {
323 return modifyIpRule(action, priority, FR_ACT_TO_TBL, table, fwmark, mask, iif, oif, uidStart,
324 uidEnd);
325 }
326
modifyIpRule(uint16_t action,uint32_t priority,uint32_t table,uint32_t fwmark,uint32_t mask)327 WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table,
328 uint32_t fwmark, uint32_t mask) {
329 return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID,
330 INVALID_UID);
331 }
332
333 // Adds or deletes an IPv4 or IPv6 route.
334 // Returns 0 on success or negative errno on failure.
modifyIpRoute(uint16_t action,uint32_t table,const char * interface,const char * destination,const char * nexthop)335 WARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface,
336 const char* destination, const char* nexthop) {
337 // At least the destination must be non-null.
338 if (!destination) {
339 ALOGE("null destination");
340 return -EFAULT;
341 }
342
343 // Parse the prefix.
344 uint8_t rawAddress[sizeof(in6_addr)];
345 uint8_t family;
346 uint8_t prefixLength;
347 int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress),
348 &prefixLength);
349 if (rawLength < 0) {
350 ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength));
351 return rawLength;
352 }
353
354 if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) {
355 ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress));
356 return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6.
357 }
358
359 uint8_t type = RTN_UNICAST;
360 uint32_t ifindex;
361 uint8_t rawNexthop[sizeof(in6_addr)];
362
363 if (nexthop && !strcmp(nexthop, "unreachable")) {
364 type = RTN_UNREACHABLE;
365 // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup
366 // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for
367 // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.)
368 interface = OIF_NONE;
369 nexthop = nullptr;
370 } else if (nexthop && !strcmp(nexthop, "throw")) {
371 type = RTN_THROW;
372 interface = OIF_NONE;
373 nexthop = nullptr;
374 } else {
375 // If an interface was specified, find the ifindex.
376 if (interface != OIF_NONE) {
377 ifindex = if_nametoindex(interface);
378 if (!ifindex) {
379 ALOGE("cannot find interface %s", interface);
380 return -ENODEV;
381 }
382 }
383
384 // If a nexthop was specified, parse it as the same family as the prefix.
385 if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) {
386 ALOGE("inet_pton failed for nexthop %s", nexthop);
387 return -EINVAL;
388 }
389 }
390
391 bool isDefaultThrowRoute = (type == RTN_THROW && prefixLength == 0);
392
393 // Assemble a rtmsg and put it in an array of iovec structures.
394 rtmsg route = {
395 .rtm_protocol = RTPROT_STATIC,
396 .rtm_type = type,
397 .rtm_family = family,
398 .rtm_dst_len = prefixLength,
399 .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK),
400 };
401
402 rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST };
403 rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY };
404
405 iovec iov[] = {
406 { nullptr, 0 },
407 { &route, sizeof(route) },
408 { &RTATTR_TABLE, sizeof(RTATTR_TABLE) },
409 { &table, sizeof(table) },
410 { &rtaDst, sizeof(rtaDst) },
411 { rawAddress, static_cast<size_t>(rawLength) },
412 { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 },
413 { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 },
414 { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 },
415 { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 },
416 { &RTATTR_PRIO, isDefaultThrowRoute ? sizeof(RTATTR_PRIO) : 0 },
417 { &PRIO_THROW, isDefaultThrowRoute ? sizeof(PRIO_THROW) : 0 },
418 };
419
420 uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_ROUTE_CREATE_FLAGS : NETLINK_REQUEST_FLAGS;
421
422 // Allow creating multiple link-local routes in the same table, so we can make IPv6
423 // work on all interfaces in the local_network table.
424 if (family == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(reinterpret_cast<in6_addr*>(rawAddress))) {
425 flags &= ~NLM_F_EXCL;
426 }
427
428 int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov), nullptr);
429 if (ret) {
430 ALOGE("Error %s route %s -> %s %s to table %u: %s",
431 actionName(action), destination, nexthop, interface, table, strerror(-ret));
432 }
433 return ret;
434 }
435
436 // An iptables rule to mark incoming packets on a network with the netId of the network.
437 //
438 // This is so that the kernel can:
439 // + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping
440 // replies, SYN-ACKs, etc).
441 // + Mark sockets that accept connections from this interface so that the connection stays on the
442 // same interface.
modifyIncomingPacketMark(unsigned netId,const char * interface,Permission permission,bool add)443 WARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface,
444 Permission permission, bool add) {
445 Fwmark fwmark;
446
447 fwmark.netId = netId;
448 fwmark.explicitlySelected = true;
449 fwmark.protectedFromVpn = true;
450 fwmark.permission = permission;
451
452 const uint32_t mask = ~Fwmark::getUidBillingMask();
453
454 std::string cmd = StringPrintf(
455 "%s %s -i %s -j MARK --set-mark 0x%x/0x%x", add ? "-A" : "-D",
456 RouteController::LOCAL_MANGLE_INPUT, interface, fwmark.intValue, mask);
457 if (RouteController::iptablesRestoreCommandFunction(V4V6, "mangle", cmd, nullptr) != 0) {
458 ALOGE("failed to change iptables rule that sets incoming packet mark");
459 return -EREMOTEIO;
460 }
461
462 return 0;
463 }
464
465 // A rule to route responses to the local network forwarded via the VPN.
466 //
467 // When a VPN is in effect, packets from the local network to upstream networks are forwarded into
468 // the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel.
modifyVpnOutputToLocalRule(const char * vpnInterface,bool add)469 WARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) {
470 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL,
471 ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE,
472 INVALID_UID, INVALID_UID);
473 }
474
475 // A rule to route all traffic from a given set of UIDs to go over the VPN.
476 //
477 // Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may
478 // have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to
479 // bypass the VPN if the protectedFromVpn bit is set.
modifyVpnUidRangeRule(uint32_t table,uid_t uidStart,uid_t uidEnd,bool secure,bool add)480 WARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd,
481 bool secure, bool add) {
482 Fwmark fwmark;
483 Fwmark mask;
484
485 fwmark.protectedFromVpn = false;
486 mask.protectedFromVpn = true;
487
488 uint32_t priority;
489
490 if (secure) {
491 priority = RULE_PRIORITY_SECURE_VPN;
492 } else {
493 priority = RULE_PRIORITY_BYPASSABLE_VPN;
494
495 fwmark.explicitlySelected = false;
496 mask.explicitlySelected = true;
497 }
498
499 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue,
500 mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd);
501 }
502
503 // A rule to allow system apps to send traffic over this VPN even if they are not part of the target
504 // set of UIDs.
505 //
506 // This is needed for DnsProxyListener to correctly resolve a request for a user who is in the
507 // target set, but where the DnsProxyListener itself is not.
modifyVpnSystemPermissionRule(unsigned netId,uint32_t table,bool secure,bool add)508 WARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure,
509 bool add) {
510 Fwmark fwmark;
511 Fwmark mask;
512
513 fwmark.netId = netId;
514 mask.netId = FWMARK_NET_ID_MASK;
515
516 fwmark.permission = PERMISSION_SYSTEM;
517 mask.permission = PERMISSION_SYSTEM;
518
519 uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN;
520
521 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue,
522 mask.intValue);
523 }
524
525 // A rule to route traffic based on an explicitly chosen network.
526 //
527 // Supports apps that use the multinetwork APIs to restrict their traffic to a network.
528 //
529 // Even though we check permissions at the time we set a netId into the fwmark of a socket, we need
530 // to check it again in the rules here, because a network's permissions may have been updated via
531 // modifyNetworkPermission().
modifyExplicitNetworkRule(unsigned netId,uint32_t table,Permission permission,uid_t uidStart,uid_t uidEnd,bool add)532 WARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table,
533 Permission permission, uid_t uidStart,
534 uid_t uidEnd, bool add) {
535 Fwmark fwmark;
536 Fwmark mask;
537
538 fwmark.netId = netId;
539 mask.netId = FWMARK_NET_ID_MASK;
540
541 fwmark.explicitlySelected = true;
542 mask.explicitlySelected = true;
543
544 fwmark.permission = permission;
545 mask.permission = permission;
546
547 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table,
548 fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd);
549 }
550
551 // A rule to route traffic based on a chosen outgoing interface.
552 //
553 // Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows
554 // the outgoing interface (typically for link-local communications).
modifyOutputInterfaceRules(const char * interface,uint32_t table,Permission permission,uid_t uidStart,uid_t uidEnd,bool add)555 WARN_UNUSED_RESULT int modifyOutputInterfaceRules(const char* interface, uint32_t table,
556 Permission permission, uid_t uidStart,
557 uid_t uidEnd, bool add) {
558 Fwmark fwmark;
559 Fwmark mask;
560
561 fwmark.permission = permission;
562 mask.permission = permission;
563
564 // If this rule does not specify a UID range, then also add a corresponding high-priority rule
565 // for root. This covers kernel-originated packets, TEEd packets and any local daemons that open
566 // sockets as root.
567 if (uidStart == INVALID_UID && uidEnd == INVALID_UID) {
568 if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OVERRIDE_OIF,
569 table, FWMARK_NONE, MASK_NONE, IIF_LOOPBACK, interface,
570 UID_ROOT, UID_ROOT)) {
571 return ret;
572 }
573 }
574
575 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table,
576 fwmark.intValue, mask.intValue, IIF_LOOPBACK, interface, uidStart, uidEnd);
577 }
578
579 // A rule to route traffic based on the chosen network.
580 //
581 // This is for sockets that have not explicitly requested a particular network, but have been
582 // bound to one when they called connect(). This ensures that sockets connected on a particular
583 // network stay on that network even if the default network changes.
modifyImplicitNetworkRule(unsigned netId,uint32_t table,bool add)584 WARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, bool add) {
585 Fwmark fwmark;
586 Fwmark mask;
587
588 fwmark.netId = netId;
589 mask.netId = FWMARK_NET_ID_MASK;
590
591 fwmark.explicitlySelected = false;
592 mask.explicitlySelected = true;
593
594 fwmark.permission = PERMISSION_NONE;
595 mask.permission = PERMISSION_NONE;
596
597 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table,
598 fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE, INVALID_UID,
599 INVALID_UID);
600 }
601
602 // A rule to enable split tunnel VPNs.
603 //
604 // If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to
605 // go over the default network, provided it has the permissions required by the default network.
modifyVpnFallthroughRule(uint16_t action,unsigned vpnNetId,const char * physicalInterface,Permission permission)606 WARN_UNUSED_RESULT int RouteController::modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId,
607 const char* physicalInterface,
608 Permission permission) {
609 uint32_t table = getRouteTableForInterface(physicalInterface);
610 if (table == RT_TABLE_UNSPEC) {
611 return -ESRCH;
612 }
613
614 Fwmark fwmark;
615 Fwmark mask;
616
617 fwmark.netId = vpnNetId;
618 mask.netId = FWMARK_NET_ID_MASK;
619
620 fwmark.permission = permission;
621 mask.permission = permission;
622
623 return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue,
624 mask.intValue);
625 }
626
627 // Add rules to allow legacy routes added through the requestRouteToHost() API.
addLegacyRouteRules()628 WARN_UNUSED_RESULT int addLegacyRouteRules() {
629 Fwmark fwmark;
630 Fwmark mask;
631
632 fwmark.explicitlySelected = false;
633 mask.explicitlySelected = true;
634
635 // Rules to allow legacy routes to override the default network.
636 if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM,
637 fwmark.intValue, mask.intValue)) {
638 return ret;
639 }
640 if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK,
641 ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) {
642 return ret;
643 }
644
645 fwmark.permission = PERMISSION_SYSTEM;
646 mask.permission = PERMISSION_SYSTEM;
647
648 // A rule to allow legacy routes from system apps to override VPNs.
649 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM,
650 fwmark.intValue, mask.intValue);
651 }
652
653 // Add rules to lookup the local network when specified explicitly or otherwise.
addLocalNetworkRules(unsigned localNetId)654 WARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) {
655 if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE,
656 INVALID_UID, INVALID_UID, ACTION_ADD)) {
657 return ret;
658 }
659
660 Fwmark fwmark;
661 Fwmark mask;
662
663 fwmark.explicitlySelected = false;
664 mask.explicitlySelected = true;
665
666 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK,
667 fwmark.intValue, mask.intValue);
668 }
669
670 /* static */
configureDummyNetwork()671 int RouteController::configureDummyNetwork() {
672 const char *interface = DummyNetwork::INTERFACE_NAME;
673 uint32_t table = getRouteTableForInterface(interface);
674 if (table == RT_TABLE_UNSPEC) {
675 // getRouteTableForInterface has already looged an error.
676 return -ESRCH;
677 }
678
679 ifc_init();
680 int ret = ifc_up(interface);
681 ifc_close();
682 if (ret) {
683 ALOGE("Can't bring up %s: %s", interface, strerror(errno));
684 return -errno;
685 }
686
687 if ((ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE,
688 INVALID_UID, INVALID_UID, ACTION_ADD))) {
689 ALOGE("Can't create oif rules for %s: %s", interface, strerror(-ret));
690 return ret;
691 }
692
693 if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "0.0.0.0/0", nullptr))) {
694 return ret;
695 }
696
697 if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "::/0", nullptr))) {
698 return ret;
699 }
700
701 return 0;
702 }
703
704 // Add an explicit unreachable rule close to the end of the prioriy list to make it clear that
705 // relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended
706 // behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable
707 // rule will hopefully make things even clearer.
addUnreachableRule()708 WARN_UNUSED_RESULT int addUnreachableRule() {
709 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, FR_ACT_UNREACHABLE, RT_TABLE_UNSPEC,
710 MARK_UNSET, MARK_UNSET, IIF_NONE, OIF_NONE, INVALID_UID, INVALID_UID);
711 }
712
modifyLocalNetwork(unsigned netId,const char * interface,bool add)713 WARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) {
714 if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) {
715 return ret;
716 }
717 return modifyOutputInterfaceRules(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE,
718 INVALID_UID, INVALID_UID, add);
719 }
720
721 /* static */
modifyPhysicalNetwork(unsigned netId,const char * interface,Permission permission,bool add)722 WARN_UNUSED_RESULT int RouteController::modifyPhysicalNetwork(unsigned netId, const char* interface,
723 Permission permission, bool add) {
724 uint32_t table = getRouteTableForInterface(interface);
725 if (table == RT_TABLE_UNSPEC) {
726 return -ESRCH;
727 }
728
729 if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) {
730 return ret;
731 }
732 if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID,
733 add)) {
734 return ret;
735 }
736 if (int ret = modifyOutputInterfaceRules(interface, table, permission, INVALID_UID, INVALID_UID,
737 add)) {
738 return ret;
739 }
740
741 // Only set implicit rules for networks that don't require permissions.
742 //
743 // This is so that if the default network ceases to be the default network and then switches
744 // from requiring no permissions to requiring permissions, we ensure that apps only use the
745 // network if they explicitly select it. This is consistent with destroySocketsLackingPermission
746 // - it closes all sockets on the network except sockets that are explicitly selected.
747 //
748 // The lack of this rule only affects the special case above, because:
749 // - The only cases where we implicitly bind a socket to a network are the default network and
750 // the bypassable VPN that applies to the app, if any.
751 // - This rule doesn't affect VPNs because they don't support permissions at all.
752 // - The default network doesn't require permissions. While we support doing this, the framework
753 // never does it (partly because we'd end up in the situation where we tell apps that there is
754 // a default network, but they can't use it).
755 // - If the network is still the default network, the presence or absence of this rule does not
756 // matter.
757 //
758 // Therefore, for the lack of this rule to affect a socket, the socket has to have been
759 // implicitly bound to a network because at the time of connect() it was the default, and that
760 // network must no longer be the default, and must now require permissions.
761 if (permission == PERMISSION_NONE) {
762 return modifyImplicitNetworkRule(netId, table, add);
763 }
764 return 0;
765 }
766
modifyRejectNonSecureNetworkRule(const UidRanges & uidRanges,bool add)767 WARN_UNUSED_RESULT int modifyRejectNonSecureNetworkRule(const UidRanges& uidRanges, bool add) {
768 Fwmark fwmark;
769 Fwmark mask;
770 fwmark.protectedFromVpn = false;
771 mask.protectedFromVpn = true;
772
773 for (const UidRangeParcel& range : uidRanges.getRanges()) {
774 if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_PROHIBIT_NON_VPN,
775 FR_ACT_PROHIBIT, RT_TABLE_UNSPEC, fwmark.intValue, mask.intValue,
776 IIF_LOOPBACK, OIF_NONE, range.start, range.stop)) {
777 return ret;
778 }
779 }
780
781 return 0;
782 }
783
modifyVirtualNetwork(unsigned netId,const char * interface,const UidRanges & uidRanges,bool secure,bool add,bool modifyNonUidBasedRules)784 WARN_UNUSED_RESULT int RouteController::modifyVirtualNetwork(unsigned netId, const char* interface,
785 const UidRanges& uidRanges,
786 bool secure, bool add,
787 bool modifyNonUidBasedRules) {
788 uint32_t table = getRouteTableForInterface(interface);
789 if (table == RT_TABLE_UNSPEC) {
790 return -ESRCH;
791 }
792
793 for (const UidRangeParcel& range : uidRanges.getRanges()) {
794 if (int ret = modifyVpnUidRangeRule(table, range.start, range.stop, secure, add)) {
795 return ret;
796 }
797 if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.start,
798 range.stop, add)) {
799 return ret;
800 }
801 if (int ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, range.start,
802 range.stop, add)) {
803 return ret;
804 }
805 }
806
807 if (modifyNonUidBasedRules) {
808 if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) {
809 return ret;
810 }
811 if (int ret = modifyVpnOutputToLocalRule(interface, add)) {
812 return ret;
813 }
814 if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) {
815 return ret;
816 }
817 return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add);
818 }
819
820 return 0;
821 }
822
modifyDefaultNetwork(uint16_t action,const char * interface,Permission permission)823 WARN_UNUSED_RESULT int RouteController::modifyDefaultNetwork(uint16_t action, const char* interface,
824 Permission permission) {
825 uint32_t table = getRouteTableForInterface(interface);
826 if (table == RT_TABLE_UNSPEC) {
827 return -ESRCH;
828 }
829
830 Fwmark fwmark;
831 Fwmark mask;
832
833 fwmark.netId = NETID_UNSET;
834 mask.netId = FWMARK_NET_ID_MASK;
835
836 fwmark.permission = permission;
837 mask.permission = permission;
838
839 return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue,
840 mask.intValue, IIF_LOOPBACK, OIF_NONE, INVALID_UID, INVALID_UID);
841 }
842
modifyTetheredNetwork(uint16_t action,const char * inputInterface,const char * outputInterface)843 WARN_UNUSED_RESULT int RouteController::modifyTetheredNetwork(uint16_t action,
844 const char* inputInterface,
845 const char* outputInterface) {
846 uint32_t table = getRouteTableForInterface(outputInterface);
847 if (table == RT_TABLE_UNSPEC) {
848 return -ESRCH;
849 }
850
851 return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET,
852 inputInterface, OIF_NONE, INVALID_UID, INVALID_UID);
853 }
854
855 // Adds or removes an IPv4 or IPv6 route to the specified table.
856 // Returns 0 on success or negative errno on failure.
modifyRoute(uint16_t action,const char * interface,const char * destination,const char * nexthop,TableType tableType)857 WARN_UNUSED_RESULT int RouteController::modifyRoute(uint16_t action, const char* interface,
858 const char* destination, const char* nexthop,
859 TableType tableType) {
860 uint32_t table;
861 switch (tableType) {
862 case RouteController::INTERFACE: {
863 table = getRouteTableForInterface(interface);
864 if (table == RT_TABLE_UNSPEC) {
865 return -ESRCH;
866 }
867 break;
868 }
869 case RouteController::LOCAL_NETWORK: {
870 table = ROUTE_TABLE_LOCAL_NETWORK;
871 break;
872 }
873 case RouteController::LEGACY_NETWORK: {
874 table = ROUTE_TABLE_LEGACY_NETWORK;
875 break;
876 }
877 case RouteController::LEGACY_SYSTEM: {
878 table = ROUTE_TABLE_LEGACY_SYSTEM;
879 break;
880 }
881 }
882
883 int ret = modifyIpRoute(action, table, interface, destination, nexthop);
884 // Trying to add a route that already exists shouldn't cause an error.
885 if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) {
886 return ret;
887 }
888
889 return 0;
890 }
891
clearTetheringRules(const char * inputInterface)892 WARN_UNUSED_RESULT int clearTetheringRules(const char* inputInterface) {
893 int ret = 0;
894 while (ret == 0) {
895 ret = modifyIpRule(RTM_DELRULE, RULE_PRIORITY_TETHERING, 0, MARK_UNSET, MARK_UNSET,
896 inputInterface, OIF_NONE, INVALID_UID, INVALID_UID);
897 }
898
899 if (ret == -ENOENT) {
900 return 0;
901 } else {
902 return ret;
903 }
904 }
905
getRulePriority(const nlmsghdr * nlh)906 uint32_t getRulePriority(const nlmsghdr *nlh) {
907 return getRtmU32Attribute(nlh, FRA_PRIORITY);
908 }
909
getRouteTable(const nlmsghdr * nlh)910 uint32_t getRouteTable(const nlmsghdr *nlh) {
911 return getRtmU32Attribute(nlh, RTA_TABLE);
912 }
913
flushRules()914 WARN_UNUSED_RESULT int flushRules() {
915 NetlinkDumpFilter shouldDelete = [] (nlmsghdr *nlh) {
916 // Don't touch rules at priority 0 because by default they are used for local input.
917 return getRulePriority(nlh) != 0;
918 };
919 return rtNetlinkFlush(RTM_GETRULE, RTM_DELRULE, "rules", shouldDelete);
920 }
921
flushRoutes(uint32_t table)922 WARN_UNUSED_RESULT int RouteController::flushRoutes(uint32_t table) {
923 NetlinkDumpFilter shouldDelete = [table] (nlmsghdr *nlh) {
924 return getRouteTable(nlh) == table;
925 };
926
927 return rtNetlinkFlush(RTM_GETROUTE, RTM_DELROUTE, "routes", shouldDelete);
928 }
929
930 // Returns 0 on success or negative errno on failure.
flushRoutes(const char * interface)931 WARN_UNUSED_RESULT int RouteController::flushRoutes(const char* interface) {
932 std::lock_guard lock(sInterfaceToTableLock);
933
934 uint32_t table = getRouteTableForInterfaceLocked(interface);
935 if (table == RT_TABLE_UNSPEC) {
936 return -ESRCH;
937 }
938
939 int ret = flushRoutes(table);
940
941 // If we failed to flush routes, the caller may elect to keep this interface around, so keep
942 // track of its name.
943 if (ret == 0) {
944 sInterfaceToTable.erase(interface);
945 }
946
947 return ret;
948 }
949
Init(unsigned localNetId)950 int RouteController::Init(unsigned localNetId) {
951 if (int ret = flushRules()) {
952 return ret;
953 }
954 if (int ret = addLegacyRouteRules()) {
955 return ret;
956 }
957 if (int ret = addLocalNetworkRules(localNetId)) {
958 return ret;
959 }
960 if (int ret = addUnreachableRule()) {
961 return ret;
962 }
963 // Don't complain if we can't add the dummy network, since not all devices support it.
964 configureDummyNetwork();
965
966 updateTableNamesFile();
967 return 0;
968 }
969
addInterfaceToLocalNetwork(unsigned netId,const char * interface)970 int RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) {
971 return modifyLocalNetwork(netId, interface, ACTION_ADD);
972 }
973
removeInterfaceFromLocalNetwork(unsigned netId,const char * interface)974 int RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) {
975 return modifyLocalNetwork(netId, interface, ACTION_DEL);
976 }
977
addInterfaceToPhysicalNetwork(unsigned netId,const char * interface,Permission permission)978 int RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface,
979 Permission permission) {
980 if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) {
981 return ret;
982 }
983 updateTableNamesFile();
984 return 0;
985 }
986
removeInterfaceFromPhysicalNetwork(unsigned netId,const char * interface,Permission permission)987 int RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface,
988 Permission permission) {
989 if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) {
990 return ret;
991 }
992 if (int ret = flushRoutes(interface)) {
993 return ret;
994 }
995 if (int ret = clearTetheringRules(interface)) {
996 return ret;
997 }
998 updateTableNamesFile();
999 return 0;
1000 }
1001
addInterfaceToVirtualNetwork(unsigned netId,const char * interface,bool secure,const UidRanges & uidRanges)1002 int RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface,
1003 bool secure, const UidRanges& uidRanges) {
1004 if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD,
1005 MODIFY_NON_UID_BASED_RULES)) {
1006 return ret;
1007 }
1008 updateTableNamesFile();
1009 return 0;
1010 }
1011
removeInterfaceFromVirtualNetwork(unsigned netId,const char * interface,bool secure,const UidRanges & uidRanges)1012 int RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface,
1013 bool secure, const UidRanges& uidRanges) {
1014 if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL,
1015 MODIFY_NON_UID_BASED_RULES)) {
1016 return ret;
1017 }
1018 if (int ret = flushRoutes(interface)) {
1019 return ret;
1020 }
1021 updateTableNamesFile();
1022 return 0;
1023 }
1024
modifyPhysicalNetworkPermission(unsigned netId,const char * interface,Permission oldPermission,Permission newPermission)1025 int RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface,
1026 Permission oldPermission,
1027 Permission newPermission) {
1028 // Add the new rules before deleting the old ones, to avoid race conditions.
1029 if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) {
1030 return ret;
1031 }
1032 return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL);
1033 }
1034
addUsersToRejectNonSecureNetworkRule(const UidRanges & uidRanges)1035 int RouteController::addUsersToRejectNonSecureNetworkRule(const UidRanges& uidRanges) {
1036 return modifyRejectNonSecureNetworkRule(uidRanges, true);
1037 }
1038
removeUsersFromRejectNonSecureNetworkRule(const UidRanges & uidRanges)1039 int RouteController::removeUsersFromRejectNonSecureNetworkRule(const UidRanges& uidRanges) {
1040 return modifyRejectNonSecureNetworkRule(uidRanges, false);
1041 }
1042
addUsersToVirtualNetwork(unsigned netId,const char * interface,bool secure,const UidRanges & uidRanges)1043 int RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure,
1044 const UidRanges& uidRanges) {
1045 return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD,
1046 !MODIFY_NON_UID_BASED_RULES);
1047 }
1048
removeUsersFromVirtualNetwork(unsigned netId,const char * interface,bool secure,const UidRanges & uidRanges)1049 int RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface,
1050 bool secure, const UidRanges& uidRanges) {
1051 return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL,
1052 !MODIFY_NON_UID_BASED_RULES);
1053 }
1054
addInterfaceToDefaultNetwork(const char * interface,Permission permission)1055 int RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) {
1056 return modifyDefaultNetwork(RTM_NEWRULE, interface, permission);
1057 }
1058
removeInterfaceFromDefaultNetwork(const char * interface,Permission permission)1059 int RouteController::removeInterfaceFromDefaultNetwork(const char* interface,
1060 Permission permission) {
1061 return modifyDefaultNetwork(RTM_DELRULE, interface, permission);
1062 }
1063
addRoute(const char * interface,const char * destination,const char * nexthop,TableType tableType)1064 int RouteController::addRoute(const char* interface, const char* destination, const char* nexthop,
1065 TableType tableType) {
1066 return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType);
1067 }
1068
removeRoute(const char * interface,const char * destination,const char * nexthop,TableType tableType)1069 int RouteController::removeRoute(const char* interface, const char* destination,
1070 const char* nexthop, TableType tableType) {
1071 return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType);
1072 }
1073
enableTethering(const char * inputInterface,const char * outputInterface)1074 int RouteController::enableTethering(const char* inputInterface, const char* outputInterface) {
1075 return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface);
1076 }
1077
disableTethering(const char * inputInterface,const char * outputInterface)1078 int RouteController::disableTethering(const char* inputInterface, const char* outputInterface) {
1079 return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface);
1080 }
1081
addVirtualNetworkFallthrough(unsigned vpnNetId,const char * physicalInterface,Permission permission)1082 int RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface,
1083 Permission permission) {
1084 return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission);
1085 }
1086
removeVirtualNetworkFallthrough(unsigned vpnNetId,const char * physicalInterface,Permission permission)1087 int RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId,
1088 const char* physicalInterface,
1089 Permission permission) {
1090 return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission);
1091 }
1092
1093 // Protects sInterfaceToTable.
1094 std::mutex RouteController::sInterfaceToTableLock;
1095 std::map<std::string, uint32_t> RouteController::sInterfaceToTable;
1096
1097
1098 } // namespace net
1099 } // namespace android
1100