blob: a087a12366237293ca18aefed19034cb433288b9 [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;
51const uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000;
52const uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000;
53const uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000;
54const uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000;
Sreeram Ramachandran6a773532014-07-11 09:10:20 -070055const uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000;
Sreeram Ramachandran87475a12014-07-15 16:20:28 -070056const uint32_t RULE_PRIORITY_TETHERING = 18000;
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070057const uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000;
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -070058const uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000;
Sreeram Ramachandran48e19b02014-07-22 22:23:20 -070059const uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000;
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070060const uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000;
Lorenzo Colittia2c23052014-07-29 09:25:44 +000061const uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000;
Lorenzo Colittidb74dba2014-07-29 18:26:21 +090062const uint32_t RULE_PRIORITY_UNREACHABLE = 32000;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070063
Sreeram Ramachandran87475a12014-07-15 16:20:28 -070064const uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97;
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -070065const uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98;
66const uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99;
67
Sreeram Ramachandran87475a12014-07-15 16:20:28 -070068const char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network";
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -070069const char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network";
70const char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system";
71
Sreeram Ramachandranbb40d512014-07-11 11:45:14 -070072const char* const ROUTE_TABLE_NAME_LOCAL = "local";
73const char* const ROUTE_TABLE_NAME_MAIN = "main";
74
Lorenzo Colitti59656512014-06-25 03:20:29 +090075// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not
76// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make
77// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert
78// that will warn us if upstream has given these values some other meaning.
79const uint16_t FRA_UID_START = 18;
80const uint16_t FRA_UID_END = 19;
81static_assert(FRA_UID_START > FRA_MAX,
82 "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. "
83 "Check that these values match what the kernel does and then update this assertion.");
84
Lorenzo Colitti72723682014-06-26 13:51:10 +090085const uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK;
86const uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL;
Lorenzo Colitti4753afd2014-06-20 23:03:29 +090087
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070088const sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0};
89
90const uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6};
91
92const char* const IP_VERSIONS[] = {"-4", "-6"};
93
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070094const uid_t UID_ROOT = 0;
Lorenzo Colitti5ad4e982015-02-26 17:34:32 +090095const char* const IIF_LOOPBACK = "lo";
Sreeram Ramachandran87475a12014-07-15 16:20:28 -070096const char* const IIF_NONE = NULL;
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070097const char* const OIF_NONE = NULL;
98const bool ACTION_ADD = true;
99const bool ACTION_DEL = false;
100const bool MODIFY_NON_UID_BASED_RULES = true;
101
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700102const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables";
Sreeram Ramachandranc7d804c2014-07-09 07:39:30 -0700103const 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 -0700104
Lorenzo Colitti99286fe2014-08-12 15:08:00 +0900105const unsigned ROUTE_FLUSH_ATTEMPTS = 2;
106
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700107// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'"
108// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t).
109constexpr uint16_t U16_RTA_LENGTH(uint16_t x) {
110 return RTA_LENGTH(x);
111}
112
113// These are practically const, but can't be declared so, because they are used to initialize
114// non-const pointers ("void* iov_base") in iovec arrays.
115rtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY };
116rtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE };
117rtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK };
118rtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK };
119rtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START };
120rtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END };
121
122rtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE };
123rtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF };
124
125uint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0};
126
127// END CONSTANTS ----------------------------------------------------------------------------------
128
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700129// No locks needed because RouteController is accessed only from one thread (in CommandListener).
130std::map<std::string, uint32_t> interfaceToTable;
Paul Jensena561e122014-06-12 16:46:37 -0400131
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700132uint32_t getRouteTableForInterface(const char* interface) {
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700133 uint32_t index = if_nametoindex(interface);
Paul Jensena561e122014-06-12 16:46:37 -0400134 if (index) {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700135 index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX;
136 interfaceToTable[interface] = index;
137 return index;
Paul Jensena561e122014-06-12 16:46:37 -0400138 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700139 // If the interface goes away if_nametoindex() will return 0 but we still need to know
140 // the index so we can remove the rules and routes.
141 auto iter = interfaceToTable.find(interface);
142 if (iter == interfaceToTable.end()) {
143 ALOGE("cannot find interface %s", interface);
144 return RT_TABLE_UNSPEC;
145 }
146 return iter->second;
147}
148
149void addTableName(uint32_t table, const std::string& name, std::string* contents) {
150 char tableString[UINT32_STRLEN];
151 snprintf(tableString, sizeof(tableString), "%u", table);
152 *contents += tableString;
153 *contents += " ";
154 *contents += name;
155 *contents += "\n";
156}
157
158// Doesn't return success/failure as the file is optional; it's okay if we fail to update it.
159void updateTableNamesFile() {
160 std::string contents;
Sreeram Ramachandranbb40d512014-07-11 11:45:14 -0700161
162 addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents);
163 addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents);
164
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700165 addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents);
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700166 addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents);
167 addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents);
Sreeram Ramachandranbb40d512014-07-11 11:45:14 -0700168
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700169 for (const auto& entry : interfaceToTable) {
170 addTableName(entry.second, entry.first, &contents);
171 }
172
Dan Albert5407e142015-03-16 10:05:59 -0700173 if (!WriteStringToFile(contents, RT_TABLES_PATH, RT_TABLES_MODE, AID_SYSTEM, AID_WIFI)) {
Elliott Hughesbd378322015-02-04 13:25:14 -0800174 ALOGE("failed to write to %s (%s)", RT_TABLES_PATH, strerror(errno));
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700175 return;
176 }
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700177}
178
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900179// Sends a netlink request and expects an ack.
180// |iov| is an array of struct iovec that contains the netlink message payload.
181// The netlink header is generated by this function based on |action| and |flags|.
182// Returns -errno if there was an error or if the kernel reported an error.
Evgenii Stepanovf65122c2016-02-11 16:55:56 -0800183
184// Disable optimizations in ASan build.
185// ASan reports an out-of-bounds 32-bit(!) access in the first loop of the
186// function (over iov[]).
187#ifdef __clang__
188#if __has_feature(address_sanitizer)
189__attribute__((optnone))
190#endif
191#endif
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700192WARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) {
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900193 nlmsghdr nlmsg = {
194 .nlmsg_type = action,
195 .nlmsg_flags = flags,
196 };
197 iov[0].iov_base = &nlmsg;
198 iov[0].iov_len = sizeof(nlmsg);
199 for (int i = 0; i < iovlen; ++i) {
200 nlmsg.nlmsg_len += iov[i].iov_len;
201 }
202
203 int ret;
204 struct {
205 nlmsghdr msg;
206 nlmsgerr err;
207 } response;
208
Nick Kralevich53ea9ca2015-01-31 13:54:00 -0800209 int sock = socket(AF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_ROUTE);
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900210 if (sock != -1 &&
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700211 connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS),
212 sizeof(NETLINK_ADDRESS)) != -1 &&
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900213 writev(sock, iov, iovlen) != -1 &&
214 (ret = recv(sock, &response, sizeof(response), 0)) != -1) {
215 if (ret == sizeof(response)) {
216 ret = response.err.error; // Netlink errors are negative errno.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700217 if (ret) {
218 ALOGE("netlink response contains error (%s)", strerror(-ret));
219 }
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900220 } else {
Sreeram Ramachandran1201e842014-07-01 15:06:05 -0700221 ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response));
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900222 ret = -EBADMSG;
223 }
224 } else {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700225 ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno));
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900226 ret = -errno;
227 }
228
229 if (sock != -1) {
230 close(sock);
231 }
232
233 return ret;
234}
235
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700236// Returns 0 on success or negative errno on failure.
237int padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) {
238 if (!input) {
239 *length = 0;
240 *padding = 0;
241 return 0;
242 }
243 *length = strlcpy(name, input, IFNAMSIZ) + 1;
244 if (*length > IFNAMSIZ) {
245 ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ);
246 return -ENAMETOOLONG;
247 }
248 *padding = RTA_SPACE(*length) - RTA_LENGTH(*length);
249 return 0;
250}
251
Sreeram Ramachandran8fe9c8e2014-04-16 12:08:05 -0700252// Adds or removes a routing rule for IPv4 and IPv6.
253//
Lorenzo Colitti6b6f25f2015-03-03 17:22:57 +0900254// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the table is
Robin Lee4ef94642016-04-01 11:50:49 +0100255// unspecified. An unspecified table is not allowed when creating an FR_ACT_TO_TBL rule.
Sreeram Ramachandran8fe9c8e2014-04-16 12:08:05 -0700256// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is
257// ignored.
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700258// + If |iif| is non-NULL, the rule matches the specified incoming interface.
259// + If |oif| is non-NULL, the rule matches the specified outgoing interface.
260// + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that
261// range (inclusive). Otherwise, the rule matches packets from all UIDs.
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900262//
263// Returns 0 on success or negative errno on failure.
Robin Lee4ef94642016-04-01 11:50:49 +0100264WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint8_t ruleType,
265 uint32_t table, uint32_t fwmark, uint32_t mask, const char* iif,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700266 const char* oif, uid_t uidStart, uid_t uidEnd) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700267 // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask.
268 if (fwmark & ~mask) {
269 ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark);
270 return -ERANGE;
271 }
272
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700273 // Interface names must include exactly one terminating NULL and be properly padded, or older
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900274 // kernels will refuse to delete rules.
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700275 char iifName[IFNAMSIZ], oifName[IFNAMSIZ];
276 size_t iifLength, oifLength;
277 uint16_t iifPadding, oifPadding;
278 if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) {
279 return ret;
280 }
281 if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) {
282 return ret;
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900283 }
284
Lorenzo Colitti59656512014-06-25 03:20:29 +0900285 // Either both start and end UID must be specified, or neither.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700286 if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) {
Sreeram Ramachandrancf891382014-07-01 15:49:20 -0700287 ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd);
Lorenzo Colitti59656512014-06-25 03:20:29 +0900288 return -EUSERS;
289 }
Robin Lee4ef94642016-04-01 11:50:49 +0100290
Lorenzo Colitti72723682014-06-26 13:51:10 +0900291 bool isUidRule = (uidStart != INVALID_UID);
Lorenzo Colitti59656512014-06-25 03:20:29 +0900292
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900293 // Assemble a rule request and put it in an array of iovec structures.
294 fib_rule_hdr rule = {
Robin Lee4ef94642016-04-01 11:50:49 +0100295 .action = ruleType,
Lorenzo Colitti6b6f25f2015-03-03 17:22:57 +0900296 // Note that here we're implicitly setting rule.table to 0. When we want to specify a
297 // non-zero table, we do this via the FRATTR_TABLE attribute.
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900298 };
299
Lorenzo Colitti6b6f25f2015-03-03 17:22:57 +0900300 // Don't ever create a rule that looks up table 0, because table 0 is the local table.
301 // It's OK to specify a table ID of 0 when deleting a rule, because that doesn't actually select
302 // table 0, it's a wildcard that matches anything.
303 if (table == RT_TABLE_UNSPEC && rule.action == FR_ACT_TO_TBL && action != RTM_DELRULE) {
304 ALOGE("RT_TABLE_UNSPEC only allowed when deleting rules");
305 return -ENOTUNIQ;
306 }
307
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700308 rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME };
309 rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME };
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900310
311 iovec iov[] = {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700312 { NULL, 0 },
313 { &rule, sizeof(rule) },
314 { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) },
315 { &priority, sizeof(priority) },
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700316 { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 },
317 { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 },
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700318 { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 },
319 { &fwmark, mask ? sizeof(fwmark) : 0 },
320 { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 },
321 { &mask, mask ? sizeof(mask) : 0 },
322 { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 },
323 { &uidStart, isUidRule ? sizeof(uidStart) : 0 },
324 { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 },
325 { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 },
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700326 { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 },
327 { iifName, iifLength },
328 { PADDING_BUFFER, iifPadding },
329 { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 },
330 { oifName, oifLength },
331 { PADDING_BUFFER, oifPadding },
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900332 };
333
Lorenzo Colitti72723682014-06-26 13:51:10 +0900334 uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700335 for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) {
336 rule.family = AF_FAMILIES[i];
337 if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) {
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900338 return ret;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700339 }
340 }
341
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900342 return 0;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700343}
344
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700345WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table,
Robin Lee4ef94642016-04-01 11:50:49 +0100346 uint32_t fwmark, uint32_t mask, const char* iif,
347 const char* oif, uid_t uidStart, uid_t uidEnd) {
348 return modifyIpRule(action, priority, FR_ACT_TO_TBL, table, fwmark, mask, iif, oif, uidStart,
349 uidEnd);
350}
351
352WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700353 uint32_t fwmark, uint32_t mask) {
354 return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID,
355 INVALID_UID);
356}
357
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900358// Adds or deletes an IPv4 or IPv6 route.
359// Returns 0 on success or negative errno on failure.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700360WARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface,
361 const char* destination, const char* nexthop) {
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900362 // At least the destination must be non-null.
363 if (!destination) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700364 ALOGE("null destination");
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900365 return -EFAULT;
366 }
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700367
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900368 // Parse the prefix.
369 uint8_t rawAddress[sizeof(in6_addr)];
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700370 uint8_t family;
371 uint8_t prefixLength;
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900372 int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress),
373 &prefixLength);
374 if (rawLength < 0) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700375 ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength));
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900376 return rawLength;
377 }
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700378
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900379 if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) {
Sreeram Ramachandran1201e842014-07-01 15:06:05 -0700380 ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress));
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900381 return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6.
382 }
383
Sreeram Ramachandrande5d5df2014-07-26 18:43:25 -0700384 uint8_t type = RTN_UNICAST;
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900385 uint32_t ifindex;
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900386 uint8_t rawNexthop[sizeof(in6_addr)];
Sreeram Ramachandrande5d5df2014-07-26 18:43:25 -0700387
388 if (nexthop && !strcmp(nexthop, "unreachable")) {
389 type = RTN_UNREACHABLE;
390 // 'interface' is likely non-NULL, as the caller (modifyRoute()) likely used it to lookup
391 // the table number. But it's an error to specify an interface ("dev ...") or a nexthop for
392 // unreachable routes, so nuke them. (IPv6 allows them to be specified; IPv4 doesn't.)
393 interface = OIF_NONE;
394 nexthop = NULL;
Lorenzo Colitti4c95a122014-09-18 16:01:50 +0900395 } else if (nexthop && !strcmp(nexthop, "throw")) {
396 type = RTN_THROW;
397 interface = OIF_NONE;
398 nexthop = NULL;
Sreeram Ramachandrande5d5df2014-07-26 18:43:25 -0700399 } else {
400 // If an interface was specified, find the ifindex.
401 if (interface != OIF_NONE) {
402 ifindex = if_nametoindex(interface);
403 if (!ifindex) {
404 ALOGE("cannot find interface %s", interface);
405 return -ENODEV;
406 }
407 }
408
409 // If a nexthop was specified, parse it as the same family as the prefix.
410 if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) {
411 ALOGE("inet_pton failed for nexthop %s", nexthop);
412 return -EINVAL;
413 }
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900414 }
415
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900416 // Assemble a rtmsg and put it in an array of iovec structures.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700417 rtmsg route = {
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900418 .rtm_protocol = RTPROT_STATIC,
Sreeram Ramachandrande5d5df2014-07-26 18:43:25 -0700419 .rtm_type = type,
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900420 .rtm_family = family,
421 .rtm_dst_len = prefixLength,
Sreeram Ramachandran2bff72e2014-07-18 13:03:47 -0700422 .rtm_scope = static_cast<uint8_t>(nexthop ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK),
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900423 };
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900424
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700425 rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST };
426 rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY };
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900427
428 iovec iov[] = {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700429 { NULL, 0 },
430 { &route, sizeof(route) },
431 { &RTATTR_TABLE, sizeof(RTATTR_TABLE) },
432 { &table, sizeof(table) },
433 { &rtaDst, sizeof(rtaDst) },
434 { rawAddress, static_cast<size_t>(rawLength) },
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700435 { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 },
436 { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 },
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700437 { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 },
438 { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 },
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900439 };
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900440
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700441 uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS :
442 NETLINK_REQUEST_FLAGS;
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900443 return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov));
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700444}
445
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700446// An iptables rule to mark incoming packets on a network with the netId of the network.
447//
448// This is so that the kernel can:
449// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping
450// replies, SYN-ACKs, etc).
451// + Mark sockets that accept connections from this interface so that the connection stays on the
452// same interface.
453WARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface,
454 Permission permission, bool add) {
455 Fwmark fwmark;
456
457 fwmark.netId = netId;
458 fwmark.explicitlySelected = true;
459 fwmark.protectedFromVpn = true;
460 fwmark.permission = permission;
461
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700462 char markString[UINT32_HEX_STRLEN];
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700463 snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue);
464
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700465 if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j",
466 "MARK", "--set-mark", markString, NULL)) {
467 ALOGE("failed to change iptables rule that sets incoming packet mark");
468 return -EREMOTEIO;
469 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700470
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700471 return 0;
472}
473
Sreeram Ramachandran111bec22014-07-22 18:51:06 -0700474// A rule to route responses to the local network forwarded via the VPN.
475//
476// When a VPN is in effect, packets from the local network to upstream networks are forwarded into
477// the VPN's tunnel interface. When the VPN forwards the responses, they emerge out of the tunnel.
478WARN_UNUSED_RESULT int modifyVpnOutputToLocalRule(const char* vpnInterface, bool add) {
479 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OUTPUT_TO_LOCAL,
480 ROUTE_TABLE_LOCAL_NETWORK, MARK_UNSET, MARK_UNSET, vpnInterface, OIF_NONE,
481 INVALID_UID, INVALID_UID);
482}
483
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700484// A rule to route all traffic from a given set of UIDs to go over the VPN.
485//
486// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may
487// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to
488// bypass the VPN if the protectedFromVpn bit is set.
489WARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd,
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700490 bool secure, bool add) {
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700491 Fwmark fwmark;
492 Fwmark mask;
493
494 fwmark.protectedFromVpn = false;
495 mask.protectedFromVpn = true;
496
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700497 uint32_t priority;
498
499 if (secure) {
500 priority = RULE_PRIORITY_SECURE_VPN;
501 } else {
502 priority = RULE_PRIORITY_BYPASSABLE_VPN;
503
504 fwmark.explicitlySelected = false;
505 mask.explicitlySelected = true;
506 }
507
508 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue,
Lorenzo Colitti5ad4e982015-02-26 17:34:32 +0900509 mask.intValue, IIF_LOOPBACK, OIF_NONE, uidStart, uidEnd);
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700510}
511
512// A rule to allow system apps to send traffic over this VPN even if they are not part of the target
513// set of UIDs.
514//
515// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the
516// target set, but where the DnsProxyListener itself is not.
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700517WARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool secure,
518 bool add) {
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700519 Fwmark fwmark;
520 Fwmark mask;
521
522 fwmark.netId = netId;
523 mask.netId = FWMARK_NET_ID_MASK;
524
525 fwmark.permission = PERMISSION_SYSTEM;
526 mask.permission = PERMISSION_SYSTEM;
527
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700528 uint32_t priority = secure ? RULE_PRIORITY_SECURE_VPN : RULE_PRIORITY_BYPASSABLE_VPN;
529
530 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, priority, table, fwmark.intValue,
531 mask.intValue);
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700532}
533
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700534// A rule to route traffic based on an explicitly chosen network.
535//
536// Supports apps that use the multinetwork APIs to restrict their traffic to a network.
537//
538// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need
539// to check it again in the rules here, because a network's permissions may have been updated via
540// modifyNetworkPermission().
541WARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table,
542 Permission permission, uid_t uidStart,
543 uid_t uidEnd, bool add) {
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700544 Fwmark fwmark;
545 Fwmark mask;
546
547 fwmark.netId = netId;
548 mask.netId = FWMARK_NET_ID_MASK;
549
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700550 fwmark.explicitlySelected = true;
551 mask.explicitlySelected = true;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700552
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700553 fwmark.permission = permission;
554 mask.permission = permission;
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700555
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700556 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700557 fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd);
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700558}
559
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700560// A rule to route traffic based on a chosen outgoing interface.
561//
562// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows
563// the outgoing interface (typically for link-local communications).
Lorenzo Colitti57947f02015-02-27 16:45:55 +0900564WARN_UNUSED_RESULT int modifyOutputInterfaceRules(const char* interface, uint32_t table,
565 Permission permission, uid_t uidStart,
566 uid_t uidEnd, bool add) {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700567 Fwmark fwmark;
568 Fwmark mask;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700569
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700570 fwmark.permission = permission;
571 mask.permission = permission;
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700572
Lorenzo Colitti57947f02015-02-27 16:45:55 +0900573 // If this rule does not specify a UID range, then also add a corresponding high-priority rule
574 // for UID. This covers forwarded packets and system daemons such as the tethering DHCP server.
575 if (uidStart == INVALID_UID && uidEnd == INVALID_UID) {
576 if (int ret = modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_VPN_OVERRIDE_OIF,
577 table, fwmark.intValue, mask.intValue, IIF_NONE, interface,
578 UID_ROOT, UID_ROOT)) {
579 return ret;
580 }
581 }
582
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700583 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700584 fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700585}
586
587// A rule to route traffic based on the chosen network.
588//
589// This is for sockets that have not explicitly requested a particular network, but have been
590// bound to one when they called connect(). This ensures that sockets connected on a particular
591// network stay on that network even if the default network changes.
592WARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table,
593 Permission permission, bool add) {
594 Fwmark fwmark;
595 Fwmark mask;
596
597 fwmark.netId = netId;
598 mask.netId = FWMARK_NET_ID_MASK;
599
600 fwmark.explicitlySelected = false;
601 mask.explicitlySelected = true;
602
603 fwmark.permission = permission;
604 mask.permission = permission;
605
606 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700607 fwmark.intValue, mask.intValue);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700608}
609
Sreeram Ramachandran48e19b02014-07-22 22:23:20 -0700610// A rule to enable split tunnel VPNs.
611//
612// If a packet with a VPN's netId doesn't find a route in the VPN's routing table, it's allowed to
613// go over the default network, provided it wasn't explicitly restricted to the VPN and has the
614// permissions required by the default network.
615WARN_UNUSED_RESULT int modifyVpnFallthroughRule(uint16_t action, unsigned vpnNetId,
616 const char* physicalInterface,
617 Permission permission) {
618 uint32_t table = getRouteTableForInterface(physicalInterface);
619 if (table == RT_TABLE_UNSPEC) {
620 return -ESRCH;
621 }
622
623 Fwmark fwmark;
624 Fwmark mask;
625
626 fwmark.netId = vpnNetId;
627 mask.netId = FWMARK_NET_ID_MASK;
628
629 fwmark.explicitlySelected = false;
630 mask.explicitlySelected = true;
631
632 fwmark.permission = permission;
633 mask.permission = permission;
634
635 return modifyIpRule(action, RULE_PRIORITY_VPN_FALLTHROUGH, table, fwmark.intValue,
636 mask.intValue);
637}
638
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700639// Add rules to allow legacy routes added through the requestRouteToHost() API.
640WARN_UNUSED_RESULT int addLegacyRouteRules() {
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700641 Fwmark fwmark;
642 Fwmark mask;
643
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700644 fwmark.explicitlySelected = false;
645 mask.explicitlySelected = true;
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700646
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700647 // Rules to allow legacy routes to override the default network.
648 if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM,
649 fwmark.intValue, mask.intValue)) {
650 return ret;
651 }
652 if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK,
653 ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) {
654 return ret;
655 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700656
657 fwmark.permission = PERMISSION_SYSTEM;
658 mask.permission = PERMISSION_SYSTEM;
659
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700660 // A rule to allow legacy routes from system apps to override VPNs.
661 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700662 fwmark.intValue, mask.intValue);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700663}
664
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700665// Add rules to lookup the local network when specified explicitly or otherwise.
666WARN_UNUSED_RESULT int addLocalNetworkRules(unsigned localNetId) {
667 if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE,
668 INVALID_UID, INVALID_UID, ACTION_ADD)) {
669 return ret;
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700670 }
671
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700672 Fwmark fwmark;
673 Fwmark mask;
674
675 fwmark.explicitlySelected = false;
676 mask.explicitlySelected = true;
677
678 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK,
679 fwmark.intValue, mask.intValue);
680}
681
Lorenzo Colitti36679362015-02-25 10:26:19 +0900682int configureDummyNetwork() {
683 const char *interface = DummyNetwork::INTERFACE_NAME;
684 uint32_t table = getRouteTableForInterface(interface);
685 if (table == RT_TABLE_UNSPEC) {
686 // getRouteTableForInterface has already looged an error.
687 return -ESRCH;
688 }
689
690 ifc_init();
691 int ret = ifc_up(interface);
692 ifc_close();
693 if (ret) {
694 ALOGE("Can't bring up %s: %s", interface, strerror(errno));
695 return -errno;
696 }
697
Lorenzo Colitti57947f02015-02-27 16:45:55 +0900698 if ((ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE,
699 INVALID_UID, INVALID_UID, ACTION_ADD))) {
700 ALOGE("Can't create oif rules for %s: %s", interface, strerror(-ret));
Lorenzo Colitti36679362015-02-25 10:26:19 +0900701 return ret;
702 }
703
704 if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "0.0.0.0/0", NULL))) {
705 ALOGE("Can't add IPv4 default route to %s: %s", interface, strerror(-ret));
706 return ret;
707 }
708
709 if ((ret = modifyIpRoute(RTM_NEWROUTE, table, interface, "::/0", NULL))) {
710 ALOGE("Can't add IPv6 default route to %s: %s", interface, strerror(-ret));
711 return ret;
712 }
713
714 return 0;
715}
716
Lorenzo Colittia2c23052014-07-29 09:25:44 +0000717// 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 +0900718// rule, but with a lower priority. We will never create routes in the main table; it should only be
719// used for directly-connected routes implicitly created by the kernel when adding IP addresses.
720// This is necessary, for example, when adding a route through a directly-connected gateway: in
721// order to add the route, there must already be a directly-connected route that covers the gateway.
Lorenzo Colittia2c23052014-07-29 09:25:44 +0000722WARN_UNUSED_RESULT int addDirectlyConnectedRule() {
723 Fwmark fwmark;
724 Fwmark mask;
725
726 fwmark.netId = NETID_UNSET;
727 mask.netId = FWMARK_NET_ID_MASK;
728
729 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN,
730 fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, UID_ROOT, UID_ROOT);
731}
732
Lorenzo Colittidb74dba2014-07-29 18:26:21 +0900733// Add an explicit unreachable rule close to the end of the prioriy list to make it clear that
734// relying on the kernel-default "from all lookup main" rule at priority 32766 is not intended
735// behaviour. We do flush the kernel-default rules at startup, but having an explicit unreachable
736// rule will hopefully make things even clearer.
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700737WARN_UNUSED_RESULT int addUnreachableRule() {
738 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET,
739 MARK_UNSET);
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700740}
741
742WARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) {
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700743 if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) {
744 return ret;
745 }
Lorenzo Colitti57947f02015-02-27 16:45:55 +0900746 return modifyOutputInterfaceRules(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE,
747 INVALID_UID, INVALID_UID, add);
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700748}
749
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700750WARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface,
751 Permission permission, bool add) {
752 uint32_t table = getRouteTableForInterface(interface);
753 if (table == RT_TABLE_UNSPEC) {
754 return -ESRCH;
755 }
756
757 if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) {
758 return ret;
759 }
760 if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID,
761 add)) {
762 return ret;
763 }
Lorenzo Colitti57947f02015-02-27 16:45:55 +0900764 if (int ret = modifyOutputInterfaceRules(interface, table, permission, INVALID_UID, INVALID_UID,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700765 add)) {
766 return ret;
767 }
768 return modifyImplicitNetworkRule(netId, table, permission, add);
769}
770
771WARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface,
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700772 const UidRanges& uidRanges, bool secure, bool add,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700773 bool modifyNonUidBasedRules) {
774 uint32_t table = getRouteTableForInterface(interface);
775 if (table == RT_TABLE_UNSPEC) {
776 return -ESRCH;
777 }
778
Sreeram Ramachandrane09b20a2014-07-05 17:15:14 -0700779 for (const UidRanges::Range& range : uidRanges.getRanges()) {
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700780 if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, secure, add)) {
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700781 return ret;
782 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700783 if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first,
784 range.second, add)) {
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700785 return ret;
786 }
Lorenzo Colitti57947f02015-02-27 16:45:55 +0900787 if (int ret = modifyOutputInterfaceRules(interface, table, PERMISSION_NONE, range.first,
788 range.second, add)) {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700789 return ret;
790 }
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700791 }
792
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700793 if (modifyNonUidBasedRules) {
794 if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) {
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700795 return ret;
796 }
Sreeram Ramachandran111bec22014-07-22 18:51:06 -0700797 if (int ret = modifyVpnOutputToLocalRule(interface, add)) {
798 return ret;
799 }
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -0700800 if (int ret = modifyVpnSystemPermissionRule(netId, table, secure, add)) {
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700801 return ret;
802 }
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700803 return modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, add);
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700804 }
805
806 return 0;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700807}
808
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700809WARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface,
810 Permission permission) {
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700811 uint32_t table = getRouteTableForInterface(interface);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700812 if (table == RT_TABLE_UNSPEC) {
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900813 return -ESRCH;
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700814 }
815
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700816 Fwmark fwmark;
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700817 Fwmark mask;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700818
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700819 fwmark.netId = NETID_UNSET;
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700820 mask.netId = FWMARK_NET_ID_MASK;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700821
822 fwmark.permission = permission;
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700823 mask.permission = permission;
824
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700825 return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue,
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700826 mask.intValue);
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700827}
828
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700829WARN_UNUSED_RESULT int modifyTetheredNetwork(uint16_t action, const char* inputInterface,
830 const char* outputInterface) {
831 uint32_t table = getRouteTableForInterface(outputInterface);
832 if (table == RT_TABLE_UNSPEC) {
833 return -ESRCH;
834 }
835
836 return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET,
837 inputInterface, OIF_NONE, INVALID_UID, INVALID_UID);
838}
839
Sreeram Ramachandranb717e742014-07-19 00:22:15 -0700840// Returns 0 on success or negative errno on failure.
841WARN_UNUSED_RESULT int flushRules() {
842 for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) {
843 const char* argv[] = {
844 IP_PATH,
845 IP_VERSIONS[i],
846 "rule",
847 "flush",
848 };
849 if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) {
850 ALOGE("failed to flush rules");
851 return -EREMOTEIO;
852 }
853 }
854 return 0;
855}
856
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700857// 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 +0900858// route, to the main table as well.
859// Returns 0 on success or negative errno on failure.
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700860WARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination,
861 const char* nexthop, RouteController::TableType tableType) {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700862 uint32_t table;
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700863 switch (tableType) {
864 case RouteController::INTERFACE: {
865 table = getRouteTableForInterface(interface);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700866 if (table == RT_TABLE_UNSPEC) {
867 return -ESRCH;
868 }
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700869 break;
870 }
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700871 case RouteController::LOCAL_NETWORK: {
872 table = ROUTE_TABLE_LOCAL_NETWORK;
873 break;
874 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700875 case RouteController::LEGACY_NETWORK: {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700876 table = ROUTE_TABLE_LEGACY_NETWORK;
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700877 break;
878 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700879 case RouteController::LEGACY_SYSTEM: {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700880 table = ROUTE_TABLE_LEGACY_SYSTEM;
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700881 break;
882 }
883 }
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700884
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900885 int ret = modifyIpRoute(action, table, interface, destination, nexthop);
Sreeram Ramachandran03213152014-10-30 10:01:07 -0700886 // Trying to add a route that already exists shouldn't cause an error.
887 if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) {
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900888 return ret;
Sreeram Ramachandranc9213372014-04-16 12:32:18 -0700889 }
890
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900891 return 0;
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700892}
893
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700894// Returns 0 on success or negative errno on failure.
895WARN_UNUSED_RESULT int flushRoutes(const char* interface) {
Sreeram Ramachandran92b66c42014-04-15 14:28:55 -0700896 uint32_t table = getRouteTableForInterface(interface);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700897 if (table == RT_TABLE_UNSPEC) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700898 return -ESRCH;
Sreeram Ramachandran92b66c42014-04-15 14:28:55 -0700899 }
900
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900901 char tableString[UINT32_STRLEN];
902 snprintf(tableString, sizeof(tableString), "%u", table);
903
Lorenzo Colitti99286fe2014-08-12 15:08:00 +0900904 int ret = 0;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700905 for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) {
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900906 const char* argv[] = {
907 IP_PATH,
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700908 IP_VERSIONS[i],
Sreeram Ramachandran72999d62014-07-02 18:06:34 -0700909 "route",
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900910 "flush",
911 "table",
912 tableString,
913 };
Lorenzo Colitti99286fe2014-08-12 15:08:00 +0900914
915 // A flush works by dumping routes and deleting each route as it's returned, and it can
916 // fail if something else deletes the route between the dump and the delete. This can
917 // happen, for example, if an interface goes down while we're trying to flush its routes.
918 // So try multiple times and only return an error if the last attempt fails.
919 //
920 // TODO: replace this with our own netlink code.
921 unsigned attempts = 0;
922 int err;
923 do {
924 err = android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv),
925 NULL, false, false);
926 ++attempts;
927 } while (err != 0 && attempts < ROUTE_FLUSH_ATTEMPTS);
928 if (err) {
929 ALOGE("failed to flush %s routes in table %s after %d attempts",
930 IP_VERSIONS[i], tableString, attempts);
931 ret = -EREMOTEIO;
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900932 }
933 }
934
Lorenzo Colitti99286fe2014-08-12 15:08:00 +0900935 // If we failed to flush routes, the caller may elect to keep this interface around, so keep
936 // track of its name.
937 if (!ret) {
938 interfaceToTable.erase(interface);
939 }
940
941 return ret;
Sreeram Ramachandran92b66c42014-04-15 14:28:55 -0700942}
943
Lorenzo Colitti6b6f25f2015-03-03 17:22:57 +0900944WARN_UNUSED_RESULT int clearTetheringRules(const char* inputInterface) {
945 int ret = 0;
946 while (ret == 0) {
947 ret = modifyIpRule(RTM_DELRULE, RULE_PRIORITY_TETHERING, 0, MARK_UNSET, MARK_UNSET,
948 inputInterface, OIF_NONE, INVALID_UID, INVALID_UID);
949 }
950
951 if (ret == -ENOENT) {
952 return 0;
953 } else {
954 return ret;
955 }
956}
957
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700958} // namespace
959
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700960int RouteController::Init(unsigned localNetId) {
Sreeram Ramachandranb717e742014-07-19 00:22:15 -0700961 if (int ret = flushRules()) {
962 return ret;
963 }
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700964 if (int ret = addLegacyRouteRules()) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700965 return ret;
966 }
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -0700967 if (int ret = addLocalNetworkRules(localNetId)) {
968 return ret;
969 }
Lorenzo Colittia2c23052014-07-29 09:25:44 +0000970 if (int ret = addDirectlyConnectedRule()) {
971 return ret;
972 }
Sreeram Ramachandranb717e742014-07-19 00:22:15 -0700973 if (int ret = addUnreachableRule()) {
974 return ret;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700975 }
Lorenzo Colitti36679362015-02-25 10:26:19 +0900976 // Don't complain if we can't add the dummy network, since not all devices support it.
977 configureDummyNetwork();
978
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700979 updateTableNamesFile();
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700980 return 0;
Sreeram Ramachandran8fe9c8e2014-04-16 12:08:05 -0700981}
982
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700983int RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) {
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700984 return modifyLocalNetwork(netId, interface, ACTION_ADD);
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700985}
986
987int RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) {
Sreeram Ramachandran87475a12014-07-15 16:20:28 -0700988 return modifyLocalNetwork(netId, interface, ACTION_DEL);
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700989}
990
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700991int RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface,
992 Permission permission) {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700993 if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) {
994 return ret;
995 }
996 updateTableNamesFile();
997 return 0;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700998}
999
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001000int RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface,
1001 Permission permission) {
1002 if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -07001003 return ret;
1004 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -07001005 if (int ret = flushRoutes(interface)) {
1006 return ret;
1007 }
Lorenzo Colitti6b6f25f2015-03-03 17:22:57 +09001008 if (int ret = clearTetheringRules(interface)) {
1009 return ret;
1010 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -07001011 updateTableNamesFile();
1012 return 0;
Sreeram Ramachandran379bd332014-04-10 19:58:06 -07001013}
1014
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001015int RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface,
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -07001016 bool secure, const UidRanges& uidRanges) {
1017 if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD,
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -07001018 MODIFY_NON_UID_BASED_RULES)) {
1019 return ret;
1020 }
1021 updateTableNamesFile();
1022 return 0;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -07001023}
1024
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001025int RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface,
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -07001026 bool secure, const UidRanges& uidRanges) {
1027 if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001028 MODIFY_NON_UID_BASED_RULES)) {
Sreeram Ramachandran4043f012014-06-23 12:41:37 -07001029 return ret;
1030 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -07001031 if (int ret = flushRoutes(interface)) {
1032 return ret;
1033 }
1034 updateTableNamesFile();
1035 return 0;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -07001036}
1037
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001038int RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface,
1039 Permission oldPermission,
1040 Permission newPermission) {
Sreeram Ramachandran379bd332014-04-10 19:58:06 -07001041 // Add the new rules before deleting the old ones, to avoid race conditions.
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001042 if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -07001043 return ret;
1044 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001045 return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL);
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -07001046}
1047
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -07001048int RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, bool secure,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001049 const UidRanges& uidRanges) {
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -07001050 return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_ADD,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001051 !MODIFY_NON_UID_BASED_RULES);
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -07001052}
1053
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001054int RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface,
Sreeram Ramachandran95684ba2014-07-23 13:27:31 -07001055 bool secure, const UidRanges& uidRanges) {
1056 return modifyVirtualNetwork(netId, interface, uidRanges, secure, ACTION_DEL,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001057 !MODIFY_NON_UID_BASED_RULES);
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -07001058}
1059
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001060int RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) {
1061 return modifyDefaultNetwork(RTM_NEWRULE, interface, permission);
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -07001062}
1063
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -07001064int RouteController::removeInterfaceFromDefaultNetwork(const char* interface,
1065 Permission permission) {
1066 return modifyDefaultNetwork(RTM_DELRULE, interface, permission);
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -07001067}
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -07001068
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -07001069int RouteController::addRoute(const char* interface, const char* destination, const char* nexthop,
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -07001070 TableType tableType) {
1071 return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType);
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -07001072}
1073
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +09001074int RouteController::removeRoute(const char* interface, const char* destination,
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -07001075 const char* nexthop, TableType tableType) {
1076 return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType);
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -07001077}
Sreeram Ramachandran87475a12014-07-15 16:20:28 -07001078
1079int RouteController::enableTethering(const char* inputInterface, const char* outputInterface) {
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -07001080 return modifyTetheredNetwork(RTM_NEWRULE, inputInterface, outputInterface);
Sreeram Ramachandran87475a12014-07-15 16:20:28 -07001081}
1082
1083int RouteController::disableTethering(const char* inputInterface, const char* outputInterface) {
Sreeram Ramachandranfa9f4dc2014-07-22 18:16:44 -07001084 return modifyTetheredNetwork(RTM_DELRULE, inputInterface, outputInterface);
Sreeram Ramachandran87475a12014-07-15 16:20:28 -07001085}
Sreeram Ramachandran48e19b02014-07-22 22:23:20 -07001086
1087int RouteController::addVirtualNetworkFallthrough(unsigned vpnNetId, const char* physicalInterface,
1088 Permission permission) {
1089 return modifyVpnFallthroughRule(RTM_NEWRULE, vpnNetId, physicalInterface, permission);
1090}
1091
1092int RouteController::removeVirtualNetworkFallthrough(unsigned vpnNetId,
1093 const char* physicalInterface,
1094 Permission permission) {
1095 return modifyVpnFallthroughRule(RTM_DELRULE, vpnNetId, physicalInterface, permission);
1096}