blob: 4e43a47bb364b5781009c4c756da1f440a71424e [file] [log] [blame]
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -07001/*
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 Albertaa1be2b2015-01-06 09:36:17 -080019#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 Hughesbd378322015-02-04 13:25:14 -080026#include <private/android_filesystem_config.h>
27
Dan Albertaa1be2b2015-01-06 09:36:17 -080028#include <map>
29
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070030#include "Fwmark.h"
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -070031#include "UidRanges.h"
Lorenzo Colitti36679362015-02-25 10:26:19 +090032#include "DummyNetwork.h"
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070033
Elliott Hughesbbd56262015-12-04 15:45:10 -080034#include "android-base/file.h"
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070035#define LOG_TAG "Netd"
36#include "log/log.h"
37#include "logwrap/logwrap.h"
Lorenzo Colitti36679362015-02-25 10:26:19 +090038#include "netutils/ifc.h"
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070039#include "resolv_netid.h"
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070040
Dan Albert5407e142015-03-16 10:05:59 -070041using android::base::WriteStringToFile;
42
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070043namespace {
44
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070045// BEGIN CONSTANTS --------------------------------------------------------------------------------
46
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070047const uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000;
Lorenzo Colitti57947f02015-02-27 16:45:55 +090048const uint32_t RULE_PRIORITY_VPN_OVERRIDE_OIF = 10500;
Sreeram Ramachandran111bec22014-07-22 18:51:06 -070049const uint32_t RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL = 11000;
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070050const uint32_t RULE_PRIORITY_SECURE_VPN = 12000;
Robin Lee6c84ef62016-05-03 13:17:58 +010051const uint32_t RULE_PRIORITY_PROHIBIT_NON_VPN = 12500;
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070052const uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000;
53const uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000;
54const uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000;
55const uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000;
Sreeram Ramachandran6a773532014-07-11 09:10:20 -070056const uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000;
Sreeram Ramachandran87475a12014-07-15 16:20:28 -070057const uint32_t RULE_PRIORITY_TETHERING = 18000;
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070058const uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000;
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -070059const uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000;
Sreeram Ramachandran48e19b02014-07-22 22:23:20 -070060const uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000;
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070061const uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000;
Lorenzo Colittia2c23052014-07-29 09:25:44 +000062const uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000;
Lorenzo Colittidb74dba2014-07-29 18:26:21 +090063const uint32_t RULE_PRIORITY_UNREACHABLE = 32000;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070064
Sreeram Ramachandran87475a12014-07-15 16:20:28 -070065const uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97;
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -070066const uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98;
67const uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99;
68
Sreeram Ramachandran87475a12014-07-15 16:20:28 -070069const char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network";
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -070070const char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network";
71const char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system";
72
Sreeram Ramachandranbb40d512014-07-11 11:45:14 -070073const char* const ROUTE_TABLE_NAME_LOCAL = "local";
74const char* const ROUTE_TABLE_NAME_MAIN = "main";
75
Lorenzo Colitti59656512014-06-25 03:20:29 +090076// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not
77// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make
78// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert
79// that will warn us if upstream has given these values some other meaning.
80const uint16_t FRA_UID_START = 18;
81const uint16_t FRA_UID_END = 19;
82static_assert(FRA_UID_START > FRA_MAX,
83 "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. "
84 "Check that these values match what the kernel does and then update this assertion.");
85
Lorenzo Colitti72723682014-06-26 13:51:10 +090086const uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK;
87const uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL;
Lorenzo Colitti4753afd2014-06-20 23:03:29 +090088
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070089const sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0};
90
91const uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6};
92
93const char* const IP_VERSIONS[] = {"-4", "-6"};
94
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070095const uid_t UID_ROOT = 0;
Lorenzo Colitti5ad4e982015-02-26 17:34:32 +090096const char* const IIF_LOOPBACK = "lo";
Sreeram Ramachandran87475a12014-07-15 16:20:28 -070097const char* const IIF_NONE = NULL;
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070098const char* const OIF_NONE = NULL;
99const bool ACTION_ADD = true;
100const bool ACTION_DEL = false;
101const bool MODIFY_NON_UID_BASED_RULES = true;
102
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700103const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables";
Sreeram Ramachandranc7d804c2014-07-09 07:39:30 -0700104const mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r--
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700105
Lorenzo Colitti99286fe2014-08-12 15:08:00 +0900106const unsigned ROUTE_FLUSH_ATTEMPTS = 2;
107
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700108// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'"
109// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t).
110constexpr uint16_t U16_RTA_LENGTH(uint16_t x) {
111 return RTA_LENGTH(x);
112}
113
114// These are practically const, but can't be declared so, because they are used to initialize
115// non-const pointers ("void* iov_base") in iovec arrays.
116rtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY };
117rtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE };
118rtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK };
119rtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK };
120rtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START };
121rtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END };
122
123rtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE };
124rtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF };
125
126uint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0};
127
128// END CONSTANTS ----------------------------------------------------------------------------------
129
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700130// No locks needed because RouteController is accessed only from one thread (in CommandListener).
131std::map<std::string, uint32_t> interfaceToTable;
Paul Jensena561e122014-06-12 16:46:37 -0400132
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700133uint32_t getRouteTableForInterface(const char* interface) {
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700134 uint32_t index = if_nametoindex(interface);
Paul Jensena561e122014-06-12 16:46:37 -0400135 if (index) {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700136 index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX;
137 interfaceToTable[interface] = index;
138 return index;
Paul Jensena561e122014-06-12 16:46:37 -0400139 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700140 // If the interface goes away if_nametoindex() will return 0 but we still need to know
141 // the index so we can remove the rules and routes.
142 auto iter = interfaceToTable.find(interface);
143 if (iter == interfaceToTable.end()) {
144 ALOGE("cannot find interface %s", interface);
145 return RT_TABLE_UNSPEC;
146 }
147 return iter->second;
148}
149
150void addTableName(uint32_t table, const std::string& name, std::string* contents) {
151 char tableString[UINT32_STRLEN];
152 snprintf(tableString, sizeof(tableString), "%u", table);
153 *contents += tableString;
154 *contents += " ";
155 *contents += name;
156 *contents += "\n";
157}
158
159// Doesn't return success/failure as the file is optional; it's okay if we fail to update it.
160void updateTableNamesFile() {
161 std::string contents;
Sreeram Ramachandranbb40d512014-07-11 11:45:14 -0700162
163 addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents);
164 addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents);
165
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700166 addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents);
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700167 addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents);
168 addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents);
Sreeram Ramachandranbb40d512014-07-11 11:45:14 -0700169
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700170 for (const auto& entry : interfaceToTable) {
171 addTableName(entry.second, entry.first, &contents);
172 }
173
Dan Albert5407e142015-03-16 10:05:59 -0700174 if (!WriteStringToFile(contents, RT_TABLES_PATH, RT_TABLES_MODE, AID_SYSTEM, AID_WIFI)) {
Elliott Hughesbd378322015-02-04 13:25:14 -0800175 ALOGE("failed to write to %s (%s)", RT_TABLES_PATH, strerror(errno));
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700176 return;
177 }
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700178}
179
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900180// Sends a netlink request and expects an ack.
181// |iov| is an array of struct iovec that contains the netlink message payload.
182// The netlink header is generated by this function based on |action| and |flags|.
183// Returns -errno if there was an error or if the kernel reported an error.
Evgenii Stepanovf65122c2016-02-11 16:55:56 -0800184
185// Disable optimizations in ASan build.
186// ASan reports an out-of-bounds 32-bit(!) access in the first loop of the
187// function (over iov[]).
188#ifdef __clang__
189#if __has_feature(address_sanitizer)
190__attribute__((optnone))
191#endif
192#endif
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700193WARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) {
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900194 nlmsghdr nlmsg = {
195 .nlmsg_type = action,
196 .nlmsg_flags = flags,
197 };
198 iov[0].iov_base = &nlmsg;
199 iov[0].iov_len = sizeof(nlmsg);
200 for (int i = 0; i < iovlen; ++i) {
201 nlmsg.nlmsg_len += iov[i].iov_len;
202 }
203
204 int ret;
205 struct {
206 nlmsghdr msg;
207 nlmsgerr err;
208 } response;
209
Nick Kralevich53ea9ca2015-01-31 13:54:00 -0800210 int sock = socket(AF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_ROUTE);
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900211 if (sock != -1 &&
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700212 connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS),
213 sizeof(NETLINK_ADDRESS)) != -1 &&
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900214 writev(sock, iov, iovlen) != -1 &&
215 (ret = recv(sock, &response, sizeof(response), 0)) != -1) {
216 if (ret == sizeof(response)) {
217 ret = response.err.error; // Netlink errors are negative errno.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700218 if (ret) {
219 ALOGE("netlink response contains error (%s)", strerror(-ret));
220 }
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900221 } else {
Sreeram Ramachandran1201e842014-07-01 15:06:05 -0700222 ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response));
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900223 ret = -EBADMSG;
224 }
225 } else {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700226 ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno));
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900227 ret = -errno;
228 }
229
230 if (sock != -1) {
231 close(sock);
232 }
233
234 return ret;
235}
236
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700237// Returns 0 on success or negative errno on failure.
238int padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) {
239 if (!input) {
240 *length = 0;
241 *padding = 0;
242 return 0;
243 }
244 *length = strlcpy(name, input, IFNAMSIZ) + 1;
245 if (*length > IFNAMSIZ) {
246 ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ);
247 return -ENAMETOOLONG;
248 }
249 *padding = RTA_SPACE(*length) - RTA_LENGTH(*length);
250 return 0;
251}
252
Sreeram Ramachandran8fe9c8e2014-04-16 12:08:05 -0700253// Adds or removes a routing rule for IPv4 and IPv6.
254//
Lorenzo Colitti6b6f25f2015-03-03 17:22:57 +0900255// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the table is
Robin Lee4ef94642016-04-01 11:50:49 +0100256// unspecified. An unspecified table is not allowed when creating an FR_ACT_TO_TBL rule.
Sreeram Ramachandran8fe9c8e2014-04-16 12:08:05 -0700257// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is
258// ignored.
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700259// + If |iif| is non-NULL, the rule matches the specified incoming interface.
260// + If |oif| is non-NULL, the rule matches the specified outgoing interface.
261// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that
262// range (inclusive). Otherwise, the rule matches packets from all UIDs.
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900263//
264// Returns 0 on success or negative errno on failure.
Robin Lee4ef94642016-04-01 11:50:49 +0100265WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint8_t ruleType,
266 uint32_t table, uint32_t fwmark, uint32_t mask, const char* iif,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700267 const char* oif, uid_t uidStart, uid_t uidEnd) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700268 // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask.
269 if (fwmark & ~mask) {
270 ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark);
271 return -ERANGE;
272 }
273
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700274 // Interface names must include exactly one terminating NULL and be properly padded, or older
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900275 // kernels will refuse to delete rules.
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700276 char iifName[IFNAMSIZ], oifName[IFNAMSIZ];
277 size_t iifLength, oifLength;
278 uint16_t iifPadding, oifPadding;
279 if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) {
280 return ret;
281 }
282 if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) {
283 return ret;
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900284 }
285
Lorenzo Colitti59656512014-06-25 03:20:29 +0900286 // Either both start and end UID must be specified, or neither.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700287 if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) {
Sreeram Ramachandrancf891382014-07-01 15:49:20 -0700288 ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd);
Lorenzo Colitti59656512014-06-25 03:20:29 +0900289 return -EUSERS;
290 }
Robin Lee4ef94642016-04-01 11:50:49 +0100291
Lorenzo Colitti72723682014-06-26 13:51:10 +0900292 bool isUidRule = (uidStart != INVALID_UID);
Lorenzo Colitti59656512014-06-25 03:20:29 +0900293
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900294 // Assemble a rule request and put it in an array of iovec structures.
295 fib_rule_hdr rule = {
Robin Lee4ef94642016-04-01 11:50:49 +0100296 .action = ruleType,
Lorenzo Colitti6b6f25f2015-03-03 17:22:57 +0900297 // Note that here we're implicitly setting rule.table to 0. When we want to specify a
298 // non-zero table, we do this via the FRATTR_TABLE attribute.
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900299 };
300
Lorenzo Colitti6b6f25f2015-03-03 17:22:57 +0900301 // Don't ever create a rule that looks up table 0, because table 0 is the local table.
302 // It's OK to specify a table ID of 0 when deleting a rule, because that doesn't actually select
303 // table 0, it's a wildcard that matches anything.
304 if (table == RT_TABLE_UNSPEC && rule.action == FR_ACT_TO_TBL && action != RTM_DELRULE) {
305 ALOGE("RT_TABLE_UNSPEC only allowed when deleting rules");
306 return -ENOTUNIQ;
307 }
308
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700309 rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME };
310 rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME };
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900311
312 iovec iov[] = {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700313 { NULL, 0 },
314 { &rule, sizeof(rule) },
315 { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) },
316 { &priority, sizeof(priority) },
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700317 { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 },
318 { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 },
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700319 { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 },
320 { &fwmark, mask ? sizeof(fwmark) : 0 },
321 { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 },
322 { &mask, mask ? sizeof(mask) : 0 },
323 { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 },
324 { &uidStart, isUidRule ? sizeof(uidStart) : 0 },
325 { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 },
326 { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 },
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700327 { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 },
328 { iifName, iifLength },
329 { PADDING_BUFFER, iifPadding },
330 { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 },
331 { oifName, oifLength },
332 { PADDING_BUFFER, oifPadding },
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900333 };
334
Lorenzo Colitti72723682014-06-26 13:51:10 +0900335 uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700336 for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) {
337 rule.family = AF_FAMILIES[i];
338 if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) {
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900339 return ret;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700340 }
341 }
342
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900343 return 0;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700344}
345
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700346WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table,
Robin Lee4ef94642016-04-01 11:50:49 +0100347 uint32_t fwmark, uint32_t mask, const char* iif,
348 const char* oif, uid_t uidStart, uid_t uidEnd) {
349 return modifyIpRule(action, priority, FR_ACT_TO_TBL, table, fwmark, mask, iif, oif, uidStart,
350 uidEnd);
351}
352
353WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700354 uint32_t fwmark, uint32_t mask) {
355 return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID,
356 INVALID_UID);
357}
358
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900359// Adds or deletes an IPv4 or IPv6 route.
360// Returns 0 on success or negative errno on failure.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700361WARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface,
362 const char* destination, const char* nexthop) {
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900363 // At least the destination must be non-null.
364 if (!destination) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700365 ALOGE("null destination");
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900366 return -EFAULT;
367 }
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700368
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900369 // Parse the prefix.
370 uint8_t rawAddress[sizeof(in6_addr)];
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700371 uint8_t family;
372 uint8_t prefixLength;
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900373 int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress),
374 &prefixLength);
375 if (rawLength < 0) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700376 ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength));
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900377 return rawLength;
378 }
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700379
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900380 if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) {
Sreeram Ramachandran1201e842014-07-01 15:06:05 -0700381 ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress));
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900382 return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6.
383 }
384
Sreeram Ramachandrande5d5df2014-07-26 18:43:25 -0700385 uint8_t type = RTN_UNICAST;
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900386 uint32_t ifindex;
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900387 uint8_t rawNexthop[sizeof(in6_addr)];
Sreeram Ramachandrande5d5df2014-07-26 18:43:25 -0700388
389 if (nexthop && !strcmp(nexthop, "unreachable")) {
390 type = RTN_UNREACHABLE;
391 // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup
392 // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for
393 // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.)
394 interface = OIF_NONE;
395 nexthop = NULL;
Lorenzo Colitti4c95a122014-09-18 16:01:50 +0900396 } else if (nexthop && !strcmp(nexthop, "throw")) {
397 type = RTN_THROW;
398 interface = OIF_NONE;
399 nexthop = NULL;
Sreeram Ramachandrande5d5df2014-07-26 18:43:25 -0700400 } else {
401 // If an interface was specified, find the ifindex.
402 if (interface != OIF_NONE) {
403 ifindex = if_nametoindex(interface);
404 if (!ifindex) {
405 ALOGE("cannot find interface %s", interface);
406 return -ENODEV;
407 }
408 }
409
410 // If a nexthop was specified, parse it as the same family as the prefix.
411 if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) {
412 ALOGE("inet_pton failed for nexthop %s", nexthop);
413 return -EINVAL;
414 }
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900415 }
416
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900417 // Assemble a rtmsg and put it in an array of iovec structures.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700418 rtmsg route = {
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900419 .rtm_protocol = RTPROT_STATIC,
Sreeram Ramachandrande5d5df2014-07-26 18:43:25 -0700420 .rtm_type = type,
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900421 .rtm_family = family,
422 .rtm_dst_len = prefixLength,
Sreeram Ramachandran2bff72e2014-07-18 13:03:47 -0700423 .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK),
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900424 };
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900425
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700426 rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST };
427 rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY };
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900428
429 iovec iov[] = {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700430 { NULL, 0 },
431 { &route, sizeof(route) },
432 { &RTATTR_TABLE, sizeof(RTATTR_TABLE) },
433 { &table, sizeof(table) },
434 { &rtaDst, sizeof(rtaDst) },
435 { rawAddress, static_cast<size_t>(rawLength) },
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700436 { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 },
437 { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 },
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700438 { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 },
439 { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 },
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900440 };
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900441
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700442 uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS :
443 NETLINK_REQUEST_FLAGS;
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900444 return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov));
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700445}
446
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700447// An iptables rule to mark incoming packets on a network with the netId of the network.
448//
449// This is so that the kernel can:
450// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping
451// replies, SYN-ACKs, etc).
452// + Mark sockets that accept connections from this interface so that the connection stays on the
453// same interface.
454WARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface,
455 Permission permission, bool add) {
456 Fwmark fwmark;
457
458 fwmark.netId = netId;
459 fwmark.explicitlySelected = true;
460 fwmark.protectedFromVpn = true;
461 fwmark.permission = permission;
462
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700463 char markString[UINT32_HEX_STRLEN];
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700464 snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue);
465
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700466 if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j",
467 "MARK", "--set-mark", markString, NULL)) {
468 ALOGE("failed to change iptables rule that sets incoming packet mark");
469 return -EREMOTEIO;
470 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700471
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700472 return 0;
473}
474
Sreeram Ramachandran111bec22014-07-22 18:51:06 -0700475// A rule to route responses to the local network forwarded via the VPN.
476//
477// When a VPN is in effect, packets from the local network to upstream networks are forwarded into
478// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel.
479WARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) {
480 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL,
481 ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE,
482 INVALID_UID, INVALID_UID);
483}
484
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700485// A rule to route all traffic from a given set of UIDs to go over the VPN.
486//
487// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may
488// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to
489// bypass the VPN if the protectedFromVpn bit is set.
490WARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd,
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700491 bool secure, bool add) {
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700492 Fwmark fwmark;
493 Fwmark mask;
494
495 fwmark.protectedFromVpn = false;
496 mask.protectedFromVpn = true;
497
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700498 uint32_t priority;
499
500 if (secure) {
501 priority = RULE_PRIORITY_SECURE_VPN;
502 } else {
503 priority = RULE_PRIORITY_BYPASSABLE_VPN;
504
505 fwmark.explicitlySelected = false;
506 mask.explicitlySelected = true;
507 }
508
509 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue,
Lorenzo Colitti5ad4e982015-02-26 17:34:32 +0900510 mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd);
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700511}
512
513// A rule to allow system apps to send traffic over this VPN even if they are not part of the target
514// set of UIDs.
515//
516// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the
517// target set, but where the DnsProxyListener itself is not.
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700518WARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure,
519 bool add) {
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700520 Fwmark fwmark;
521 Fwmark mask;
522
523 fwmark.netId = netId;
524 mask.netId = FWMARK_NET_ID_MASK;
525
526 fwmark.permission = PERMISSION_SYSTEM;
527 mask.permission = PERMISSION_SYSTEM;
528
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700529 uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN;
530
531 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue,
532 mask.intValue);
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700533}
534
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700535// A rule to route traffic based on an explicitly chosen network.
536//
537// Supports apps that use the multinetwork APIs to restrict their traffic to a network.
538//
539// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need
540// to check it again in the rules here, because a network's permissions may have been updated via
541// modifyNetworkPermission().
542WARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table,
543 Permission permission, uid_t uidStart,
544 uid_t uidEnd, bool add) {
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700545 Fwmark fwmark;
546 Fwmark mask;
547
548 fwmark.netId = netId;
549 mask.netId = FWMARK_NET_ID_MASK;
550
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700551 fwmark.explicitlySelected = true;
552 mask.explicitlySelected = true;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700553
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700554 fwmark.permission = permission;
555 mask.permission = permission;
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700556
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700557 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700558 fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd);
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700559}
560
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700561// A rule to route traffic based on a chosen outgoing interface.
562//
563// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows
564// the outgoing interface (typically for link-local communications).
Lorenzo Colitti57947f02015-02-27 16:45:55 +0900565WARN_UNUSED_RESULT int modifyOutputInterfaceRules(const char* interface, uint32_t table,
566 Permission permission, uid_t uidStart,
567 uid_t uidEnd, bool add) {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700568 Fwmark fwmark;
569 Fwmark mask;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700570
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700571 fwmark.permission = permission;
572 mask.permission = permission;
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700573
Lorenzo Colitti57947f02015-02-27 16:45:55 +0900574 // If this rule does not specify a UID range, then also add a corresponding high-priority rule
575 // for UID. This covers forwarded packets and system daemons such as the tethering DHCP server.
576 if (uidStart == INVALID_UID && uidEnd == INVALID_UID) {
577 if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OVERRIDE_OIF,
578 table, fwmark.intValue, mask.intValue, IIF_NONE, interface,
579 UID_ROOT, UID_ROOT)) {
580 return ret;
581 }
582 }
583
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700584 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700585 fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700586}
587
588// A rule to route traffic based on the chosen network.
589//
590// This is for sockets that have not explicitly requested a particular network, but have been
591// bound to one when they called connect(). This ensures that sockets connected on a particular
592// network stay on that network even if the default network changes.
593WARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table,
594 Permission permission, bool add) {
595 Fwmark fwmark;
596 Fwmark mask;
597
598 fwmark.netId = netId;
599 mask.netId = FWMARK_NET_ID_MASK;
600
601 fwmark.explicitlySelected = false;
602 mask.explicitlySelected = true;
603
604 fwmark.permission = permission;
605 mask.permission = permission;
606
607 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700608 fwmark.intValue, mask.intValue);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700609}
610
Sreeram Ramachandran48e19b02014-07-22 22:23:20 -0700611// A rule to enable split tunnel VPNs.
612//
613// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to
614// go over the default network, provided it wasn't explicitly restricted to the VPN and has the
615// permissions required by the default network.
616WARN_UNUSED_RESULT int modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId,
617 const char* physicalInterface,
618 Permission permission) {
619 uint32_t table = getRouteTableForInterface(physicalInterface);
620 if (table == RT_TABLE_UNSPEC) {
621 return -ESRCH;
622 }
623
624 Fwmark fwmark;
625 Fwmark mask;
626
627 fwmark.netId = vpnNetId;
628 mask.netId = FWMARK_NET_ID_MASK;
629
630 fwmark.explicitlySelected = false;
631 mask.explicitlySelected = true;
632
633 fwmark.permission = permission;
634 mask.permission = permission;
635
636 return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue,
637 mask.intValue);
638}
639
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700640// Add rules to allow legacy routes added through the requestRouteToHost() API.
641WARN_UNUSED_RESULT int addLegacyRouteRules() {
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700642 Fwmark fwmark;
643 Fwmark mask;
644
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700645 fwmark.explicitlySelected = false;
646 mask.explicitlySelected = true;
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700647
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700648 // Rules to allow legacy routes to override the default network.
649 if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM,
650 fwmark.intValue, mask.intValue)) {
651 return ret;
652 }
653 if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK,
654 ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) {
655 return ret;
656 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700657
658 fwmark.permission = PERMISSION_SYSTEM;
659 mask.permission = PERMISSION_SYSTEM;
660
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700661 // A rule to allow legacy routes from system apps to override VPNs.
662 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700663 fwmark.intValue, mask.intValue);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700664}
665
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700666// Add rules to lookup the local network when specified explicitly or otherwise.
667WARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) {
668 if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE,
669 INVALID_UID, INVALID_UID, ACTION_ADD)) {
670 return ret;
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700671 }
672
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700673 Fwmark fwmark;
674 Fwmark mask;
675
676 fwmark.explicitlySelected = false;
677 mask.explicitlySelected = true;
678
679 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK,
680 fwmark.intValue, mask.intValue);
681}
682
Lorenzo Colitti36679362015-02-25 10:26:19 +0900683int configureDummyNetwork() {
684 const char *interface = DummyNetwork::INTERFACE_NAME;
685 uint32_t table = getRouteTableForInterface(interface);
686 if (table == RT_TABLE_UNSPEC) {
687 // getRouteTableForInterface has already looged an error.
688 return -ESRCH;
689 }
690
691 ifc_init();
692 int ret = ifc_up(interface);
693 ifc_close();
694 if (ret) {
695 ALOGE("Can't bring up %s: %s", interface, strerror(errno));
696 return -errno;
697 }
698
Lorenzo Colitti57947f02015-02-27 16:45:55 +0900699 if ((ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE,
700 INVALID_UID, INVALID_UID, ACTION_ADD))) {
701 ALOGE("Can't create oif rules for %s: %s", interface, strerror(-ret));
Lorenzo Colitti36679362015-02-25 10:26:19 +0900702 return ret;
703 }
704
705 if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "0.0.0.0/0", NULL))) {
706 ALOGE("Can't add IPv4 default route to %s: %s", interface, strerror(-ret));
707 return ret;
708 }
709
710 if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "::/0", NULL))) {
711 ALOGE("Can't add IPv6 default route to %s: %s", interface, strerror(-ret));
712 return ret;
713 }
714
715 return 0;
716}
717
Lorenzo Colittia2c23052014-07-29 09:25:44 +0000718// Add a new rule to look up the 'main' table, with the same selectors as the "default network"
Lorenzo Colittidb74dba2014-07-29 18:26:21 +0900719// rule, but with a lower priority. We will never create routes in the main table; it should only be
720// used for directly-connected routes implicitly created by the kernel when adding IP addresses.
721// This is necessary, for example, when adding a route through a directly-connected gateway: in
722// order to add the route, there must already be a directly-connected route that covers the gateway.
Lorenzo Colittia2c23052014-07-29 09:25:44 +0000723WARN_UNUSED_RESULT int addDirectlyConnectedRule() {
724 Fwmark fwmark;
725 Fwmark mask;
726
727 fwmark.netId = NETID_UNSET;
728 mask.netId = FWMARK_NET_ID_MASK;
729
730 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN,
731 fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, UID_ROOT, UID_ROOT);
732}
733
Lorenzo Colittidb74dba2014-07-29 18:26:21 +0900734// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that
735// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended
736// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable
737// rule will hopefully make things even clearer.
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700738WARN_UNUSED_RESULT int addUnreachableRule() {
739 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET,
740 MARK_UNSET);
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700741}
742
743WARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) {
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700744 if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) {
745 return ret;
746 }
Lorenzo Colitti57947f02015-02-27 16:45:55 +0900747 return modifyOutputInterfaceRules(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE,
748 INVALID_UID, INVALID_UID, add);
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700749}
750
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700751WARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface,
752 Permission permission, bool add) {
753 uint32_t table = getRouteTableForInterface(interface);
754 if (table == RT_TABLE_UNSPEC) {
755 return -ESRCH;
756 }
757
758 if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) {
759 return ret;
760 }
761 if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID,
762 add)) {
763 return ret;
764 }
Lorenzo Colitti57947f02015-02-27 16:45:55 +0900765 if (int ret = modifyOutputInterfaceRules(interface, table, permission, INVALID_UID, INVALID_UID,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700766 add)) {
767 return ret;
768 }
769 return modifyImplicitNetworkRule(netId, table, permission, add);
770}
771
Robin Leeb8087362016-03-30 18:43:08 +0100772WARN_UNUSED_RESULT int modifyRejectNonSecureNetworkRule(const UidRanges& uidRanges, bool add) {
773 Fwmark fwmark;
774 Fwmark mask;
775 fwmark.protectedFromVpn = false;
776 mask.protectedFromVpn = true;
777
778 for (const UidRanges::Range& range : uidRanges.getRanges()) {
779 if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE,
780 RULE_PRIORITY_PROHIBIT_NON_VPN, FR_ACT_PROHIBIT, RT_TABLE_UNSPEC,
781 fwmark.intValue, mask.intValue, IIF_LOOPBACK, OIF_NONE,
782 range.first, range.second)) {
783 return ret;
784 }
785 }
786
787 return 0;
788}
789
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700790WARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface,
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700791 const UidRanges& uidRanges, bool secure, bool add,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700792 bool modifyNonUidBasedRules) {
793 uint32_t table = getRouteTableForInterface(interface);
794 if (table == RT_TABLE_UNSPEC) {
795 return -ESRCH;
796 }
797
Sreeram Ramachandrane09b20a2014-07-05 17:15:14 -0700798 for (const UidRanges::Range& range : uidRanges.getRanges()) {
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700799 if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, secure, add)) {
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700800 return ret;
801 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700802 if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first,
803 range.second, add)) {
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700804 return ret;
805 }
Lorenzo Colitti57947f02015-02-27 16:45:55 +0900806 if (int ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, range.first,
807 range.second, add)) {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700808 return ret;
809 }
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700810 }
811
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700812 if (modifyNonUidBasedRules) {
813 if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) {
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700814 return ret;
815 }
Sreeram Ramachandran111bec22014-07-22 18:51:06 -0700816 if (int ret = modifyVpnOutputToLocalRule(interface, add)) {
817 return ret;
818 }
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700819 if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) {
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700820 return ret;
821 }
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700822 return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add);
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700823 }
824
825 return 0;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700826}
827
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700828WARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface,
829 Permission permission) {
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700830 uint32_t table = getRouteTableForInterface(interface);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700831 if (table == RT_TABLE_UNSPEC) {
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900832 return -ESRCH;
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700833 }
834
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700835 Fwmark fwmark;
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700836 Fwmark mask;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700837
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700838 fwmark.netId = NETID_UNSET;
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700839 mask.netId = FWMARK_NET_ID_MASK;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700840
841 fwmark.permission = permission;
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700842 mask.permission = permission;
843
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700844 return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700845 mask.intValue);
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700846}
847
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700848WARN_UNUSED_RESULT int modifyTetheredNetwork(uint16_t action, const char* inputInterface,
849 const char* outputInterface) {
850 uint32_t table = getRouteTableForInterface(outputInterface);
851 if (table == RT_TABLE_UNSPEC) {
852 return -ESRCH;
853 }
854
855 return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET,
856 inputInterface, OIF_NONE, INVALID_UID, INVALID_UID);
857}
858
Sreeram Ramachandranb717e742014-07-19 00:22:15 -0700859// Returns 0 on success or negative errno on failure.
860WARN_UNUSED_RESULT int flushRules() {
861 for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) {
862 const char* argv[] = {
863 IP_PATH,
864 IP_VERSIONS[i],
865 "rule",
866 "flush",
867 };
868 if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) {
869 ALOGE("failed to flush rules");
870 return -EREMOTEIO;
871 }
872 }
873 return 0;
874}
875
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700876// Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900877// route, to the main table as well.
878// Returns 0 on success or negative errno on failure.
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700879WARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination,
880 const char* nexthop, RouteController::TableType tableType) {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700881 uint32_t table;
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700882 switch (tableType) {
883 case RouteController::INTERFACE: {
884 table = getRouteTableForInterface(interface);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700885 if (table == RT_TABLE_UNSPEC) {
886 return -ESRCH;
887 }
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700888 break;
889 }
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700890 case RouteController::LOCAL_NETWORK: {
891 table = ROUTE_TABLE_LOCAL_NETWORK;
892 break;
893 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700894 case RouteController::LEGACY_NETWORK: {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700895 table = ROUTE_TABLE_LEGACY_NETWORK;
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700896 break;
897 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700898 case RouteController::LEGACY_SYSTEM: {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700899 table = ROUTE_TABLE_LEGACY_SYSTEM;
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700900 break;
901 }
902 }
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700903
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900904 int ret = modifyIpRoute(action, table, interface, destination, nexthop);
Sreeram Ramachandran03213152014-10-30 10:01:07 -0700905 // Trying to add a route that already exists shouldn't cause an error.
906 if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) {
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900907 return ret;
Sreeram Ramachandranc9213372014-04-16 12:32:18 -0700908 }
909
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900910 return 0;
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700911}
912
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700913// Returns 0 on success or negative errno on failure.
914WARN_UNUSED_RESULT int flushRoutes(const char* interface) {
Sreeram Ramachandran92b66c42014-04-15 14:28:55 -0700915 uint32_t table = getRouteTableForInterface(interface);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700916 if (table == RT_TABLE_UNSPEC) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700917 return -ESRCH;
Sreeram Ramachandran92b66c42014-04-15 14:28:55 -0700918 }
919
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900920 char tableString[UINT32_STRLEN];
921 snprintf(tableString, sizeof(tableString), "%u", table);
922
Lorenzo Colitti99286fe2014-08-12 15:08:00 +0900923 int ret = 0;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700924 for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) {
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900925 const char* argv[] = {
926 IP_PATH,
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700927 IP_VERSIONS[i],
Sreeram Ramachandran72999d62014-07-02 18:06:34 -0700928 "route",
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900929 "flush",
930 "table",
931 tableString,
932 };
Lorenzo Colitti99286fe2014-08-12 15:08:00 +0900933
934 // A flush works by dumping routes and deleting each route as it's returned, and it can
935 // fail if something else deletes the route between the dump and the delete. This can
936 // happen, for example, if an interface goes down while we're trying to flush its routes.
937 // So try multiple times and only return an error if the last attempt fails.
938 //
939 // TODO: replace this with our own netlink code.
940 unsigned attempts = 0;
941 int err;
942 do {
943 err = android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv),
944 NULL, false, false);
945 ++attempts;
946 } while (err != 0 && attempts < ROUTE_FLUSH_ATTEMPTS);
947 if (err) {
948 ALOGE("failed to flush %s routes in table %s after %d attempts",
949 IP_VERSIONS[i], tableString, attempts);
950 ret = -EREMOTEIO;
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900951 }
952 }
953
Lorenzo Colitti99286fe2014-08-12 15:08:00 +0900954 // If we failed to flush routes, the caller may elect to keep this interface around, so keep
955 // track of its name.
956 if (!ret) {
957 interfaceToTable.erase(interface);
958 }
959
960 return ret;
Sreeram Ramachandran92b66c42014-04-15 14:28:55 -0700961}
962
Lorenzo Colitti6b6f25f2015-03-03 17:22:57 +0900963WARN_UNUSED_RESULT int clearTetheringRules(const char* inputInterface) {
964 int ret = 0;
965 while (ret == 0) {
966 ret = modifyIpRule(RTM_DELRULE, RULE_PRIORITY_TETHERING, 0, MARK_UNSET, MARK_UNSET,
967 inputInterface, OIF_NONE, INVALID_UID, INVALID_UID);
968 }
969
970 if (ret == -ENOENT) {
971 return 0;
972 } else {
973 return ret;
974 }
975}
976
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700977} // namespace
978
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700979int RouteController::Init(unsigned localNetId) {
Sreeram Ramachandranb717e742014-07-19 00:22:15 -0700980 if (int ret = flushRules()) {
981 return ret;
982 }
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700983 if (int ret = addLegacyRouteRules()) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700984 return ret;
985 }
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700986 if (int ret = addLocalNetworkRules(localNetId)) {
987 return ret;
988 }
Lorenzo Colittia2c23052014-07-29 09:25:44 +0000989 if (int ret = addDirectlyConnectedRule()) {
990 return ret;
991 }
Sreeram Ramachandranb717e742014-07-19 00:22:15 -0700992 if (int ret = addUnreachableRule()) {
993 return ret;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700994 }
Lorenzo Colitti36679362015-02-25 10:26:19 +0900995 // Don't complain if we can't add the dummy network, since not all devices support it.
996 configureDummyNetwork();
997
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700998 updateTableNamesFile();
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700999 return 0;
Sreeram Ramachandran8fe9c8e2014-04-16 12:08:05 -07001000}
1001
Sreeram Ramachandran6a773532014-07-11 09:10:20 -07001002int RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) {
Sreeram Ramachandran87475a12014-07-15 16:20:28 -07001003 return modifyLocalNetwork(netId, interface, ACTION_ADD);
Sreeram Ramachandran6a773532014-07-11 09:10:20 -07001004}
1005
1006int RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) {
Sreeram Ramachandran87475a12014-07-15 16:20:28 -07001007 return modifyLocalNetwork(netId, interface, ACTION_DEL);
Sreeram Ramachandran6a773532014-07-11 09:10:20 -07001008}
1009
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001010int RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface,
1011 Permission permission) {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -07001012 if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) {
1013 return ret;
1014 }
1015 updateTableNamesFile();
1016 return 0;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -07001017}
1018
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001019int RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface,
1020 Permission permission) {
1021 if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -07001022 return ret;
1023 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -07001024 if (int ret = flushRoutes(interface)) {
1025 return ret;
1026 }
Lorenzo Colitti6b6f25f2015-03-03 17:22:57 +09001027 if (int ret = clearTetheringRules(interface)) {
1028 return ret;
1029 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -07001030 updateTableNamesFile();
1031 return 0;
Sreeram Ramachandran379bd332014-04-10 19:58:06 -07001032}
1033
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001034int RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface,
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -07001035 bool secure, const UidRanges& uidRanges) {
1036 if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD,
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -07001037 MODIFY_NON_UID_BASED_RULES)) {
1038 return ret;
1039 }
1040 updateTableNamesFile();
1041 return 0;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -07001042}
1043
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001044int RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface,
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -07001045 bool secure, const UidRanges& uidRanges) {
1046 if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001047 MODIFY_NON_UID_BASED_RULES)) {
Sreeram Ramachandran4043f012014-06-23 12:41:37 -07001048 return ret;
1049 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -07001050 if (int ret = flushRoutes(interface)) {
1051 return ret;
1052 }
1053 updateTableNamesFile();
1054 return 0;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -07001055}
1056
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001057int RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface,
1058 Permission oldPermission,
1059 Permission newPermission) {
Sreeram Ramachandran379bd332014-04-10 19:58:06 -07001060 // Add the new rules before deleting the old ones, to avoid race conditions.
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001061 if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -07001062 return ret;
1063 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001064 return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL);
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -07001065}
1066
Robin Leeb8087362016-03-30 18:43:08 +01001067int RouteController::addUsersToRejectNonSecureNetworkRule(const UidRanges& uidRanges) {
1068 return modifyRejectNonSecureNetworkRule(uidRanges, true);
1069}
1070
1071int RouteController::removeUsersFromRejectNonSecureNetworkRule(const UidRanges& uidRanges) {
1072 return modifyRejectNonSecureNetworkRule(uidRanges, false);
1073}
1074
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -07001075int RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001076 const UidRanges& uidRanges) {
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -07001077 return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001078 !MODIFY_NON_UID_BASED_RULES);
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -07001079}
1080
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001081int RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface,
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -07001082 bool secure, const UidRanges& uidRanges) {
1083 return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001084 !MODIFY_NON_UID_BASED_RULES);
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -07001085}
1086
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001087int RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) {
1088 return modifyDefaultNetwork(RTM_NEWRULE, interface, permission);
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -07001089}
1090
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001091int RouteController::removeInterfaceFromDefaultNetwork(const char* interface,
1092 Permission permission) {
1093 return modifyDefaultNetwork(RTM_DELRULE, interface, permission);
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -07001094}
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -07001095
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -07001096int RouteController::addRoute(const char* interface, const char* destination, const char* nexthop,
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -07001097 TableType tableType) {
1098 return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType);
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -07001099}
1100
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +09001101int RouteController::removeRoute(const char* interface, const char* destination,
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -07001102 const char* nexthop, TableType tableType) {
1103 return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType);
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -07001104}
Sreeram Ramachandran87475a12014-07-15 16:20:28 -07001105
1106int RouteController::enableTethering(const char* inputInterface, const char* outputInterface) {
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -07001107 return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface);
Sreeram Ramachandran87475a12014-07-15 16:20:28 -07001108}
1109
1110int RouteController::disableTethering(const char* inputInterface, const char* outputInterface) {
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -07001111 return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface);
Sreeram Ramachandran87475a12014-07-15 16:20:28 -07001112}
Sreeram Ramachandran48e19b02014-07-22 22:23:20 -07001113
1114int RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface,
1115 Permission permission) {
1116 return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission);
1117}
1118
1119int RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId,
1120 const char* physicalInterface,
1121 Permission permission) {
1122 return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission);
1123}