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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
19#include "Fwmark.h"
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -070020#include "UidRanges.h"
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070021
22#define LOG_TAG "Netd"
23#include "log/log.h"
24#include "logwrap/logwrap.h"
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070025#include "resolv_netid.h"
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070026
Lorenzo Colittiba25df92014-06-18 00:22:17 +090027#include <arpa/inet.h>
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -070028#include <fcntl.h>
Lorenzo Colitti4753afd2014-06-20 23:03:29 +090029#include <linux/fib_rules.h>
Paul Jensena561e122014-06-12 16:46:37 -040030#include <map>
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070031#include <net/if.h>
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -070032#include <sys/stat.h>
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070033
34namespace {
35
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070036// BEGIN CONSTANTS --------------------------------------------------------------------------------
37
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070038const uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000;
39// const uint32_t RULE_PRIORITY_VPN_OVERRIDE_LOCAL = 11000;
40const uint32_t RULE_PRIORITY_SECURE_VPN = 12000;
41const uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000;
42const uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000;
43const uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000;
44const uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000;
Sreeram Ramachandran6a773532014-07-11 09:10:20 -070045const uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000;
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070046// const uint32_t RULE_PRIORITY_TETHERING = 18000;
47const uint32_t RULE_PRIORITY_IMPLICIT_NETWORK = 19000;
48// const uint32_t RULE_PRIORITY_BYPASSABLE_VPN = 20000;
49// const uint32_t RULE_PRIORITY_VPN_FALLTHROUGH = 21000;
50const uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000;
51const uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000;
52const uint32_t RULE_PRIORITY_UNREACHABLE = 24000;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -070053
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -070054const uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98;
55const uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99;
56
57const char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network";
58const char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system";
59
Sreeram Ramachandranbb40d512014-07-11 11:45:14 -070060const char* const ROUTE_TABLE_NAME_LOCAL = "local";
61const char* const ROUTE_TABLE_NAME_MAIN = "main";
62
Lorenzo Colitti59656512014-06-25 03:20:29 +090063// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not
64// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make
65// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert
66// that will warn us if upstream has given these values some other meaning.
67const uint16_t FRA_UID_START = 18;
68const uint16_t FRA_UID_END = 19;
69static_assert(FRA_UID_START > FRA_MAX,
70 "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. "
71 "Check that these values match what the kernel does and then update this assertion.");
72
Lorenzo Colitti72723682014-06-26 13:51:10 +090073const uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK;
74const uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL;
Lorenzo Colitti4753afd2014-06-20 23:03:29 +090075
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070076const sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0};
77
78const uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6};
79
80const char* const IP_VERSIONS[] = {"-4", "-6"};
81
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070082const uid_t UID_ROOT = 0;
83const char* const OIF_NONE = NULL;
84const bool ACTION_ADD = true;
85const bool ACTION_DEL = false;
86const bool MODIFY_NON_UID_BASED_RULES = true;
87
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -070088const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables";
Sreeram Ramachandranc7d804c2014-07-09 07:39:30 -070089const int RT_TABLES_FLAGS = O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW | O_CLOEXEC;
90const 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 -070091
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070092// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'"
93// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t).
94constexpr uint16_t U16_RTA_LENGTH(uint16_t x) {
95 return RTA_LENGTH(x);
96}
97
98// These are practically const, but can't be declared so, because they are used to initialize
99// non-const pointers ("void* iov_base") in iovec arrays.
100rtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY };
101rtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE };
102rtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK };
103rtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK };
104rtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START };
105rtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END };
106
107rtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE };
108rtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF };
109
110uint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0};
111
112// END CONSTANTS ----------------------------------------------------------------------------------
113
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700114// No locks needed because RouteController is accessed only from one thread (in CommandListener).
115std::map<std::string, uint32_t> interfaceToTable;
Paul Jensena561e122014-06-12 16:46:37 -0400116
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700117uint32_t getRouteTableForInterface(const char* interface) {
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700118 uint32_t index = if_nametoindex(interface);
Paul Jensena561e122014-06-12 16:46:37 -0400119 if (index) {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700120 index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX;
121 interfaceToTable[interface] = index;
122 return index;
Paul Jensena561e122014-06-12 16:46:37 -0400123 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700124 // If the interface goes away if_nametoindex() will return 0 but we still need to know
125 // the index so we can remove the rules and routes.
126 auto iter = interfaceToTable.find(interface);
127 if (iter == interfaceToTable.end()) {
128 ALOGE("cannot find interface %s", interface);
129 return RT_TABLE_UNSPEC;
130 }
131 return iter->second;
132}
133
134void addTableName(uint32_t table, const std::string& name, std::string* contents) {
135 char tableString[UINT32_STRLEN];
136 snprintf(tableString, sizeof(tableString), "%u", table);
137 *contents += tableString;
138 *contents += " ";
139 *contents += name;
140 *contents += "\n";
141}
142
143// Doesn't return success/failure as the file is optional; it's okay if we fail to update it.
144void updateTableNamesFile() {
145 std::string contents;
Sreeram Ramachandranbb40d512014-07-11 11:45:14 -0700146
147 addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents);
148 addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents);
149
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700150 addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents);
151 addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents);
Sreeram Ramachandranbb40d512014-07-11 11:45:14 -0700152
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700153 for (const auto& entry : interfaceToTable) {
154 addTableName(entry.second, entry.first, &contents);
155 }
156
Sreeram Ramachandranc7d804c2014-07-09 07:39:30 -0700157 int fd = open(RT_TABLES_PATH, RT_TABLES_FLAGS, RT_TABLES_MODE);
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700158 if (fd == -1) {
159 ALOGE("failed to create %s (%s)", RT_TABLES_PATH, strerror(errno));
160 return;
161 }
162 // File creation is affected by umask, so make sure the right mode bits are set.
Sreeram Ramachandranc7d804c2014-07-09 07:39:30 -0700163 if (fchmod(fd, RT_TABLES_MODE) == -1) {
164 ALOGE("failed to set mode 0%o on %s (%s)", RT_TABLES_MODE, RT_TABLES_PATH, strerror(errno));
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700165 }
166 ssize_t bytesWritten = write(fd, contents.data(), contents.size());
167 if (bytesWritten != static_cast<ssize_t>(contents.size())) {
168 ALOGE("failed to write to %s (%zd vs %zu bytes) (%s)", RT_TABLES_PATH, bytesWritten,
169 contents.size(), strerror(errno));
170 }
171 close(fd);
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700172}
173
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900174// Sends a netlink request and expects an ack.
175// |iov| is an array of struct iovec that contains the netlink message payload.
176// The netlink header is generated by this function based on |action| and |flags|.
177// Returns -errno if there was an error or if the kernel reported an error.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700178WARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) {
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900179 nlmsghdr nlmsg = {
180 .nlmsg_type = action,
181 .nlmsg_flags = flags,
182 };
183 iov[0].iov_base = &nlmsg;
184 iov[0].iov_len = sizeof(nlmsg);
185 for (int i = 0; i < iovlen; ++i) {
186 nlmsg.nlmsg_len += iov[i].iov_len;
187 }
188
189 int ret;
190 struct {
191 nlmsghdr msg;
192 nlmsgerr err;
193 } response;
194
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900195 int sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
196 if (sock != -1 &&
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700197 connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS),
198 sizeof(NETLINK_ADDRESS)) != -1 &&
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900199 writev(sock, iov, iovlen) != -1 &&
200 (ret = recv(sock, &response, sizeof(response), 0)) != -1) {
201 if (ret == sizeof(response)) {
202 ret = response.err.error; // Netlink errors are negative errno.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700203 if (ret) {
204 ALOGE("netlink response contains error (%s)", strerror(-ret));
205 }
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900206 } else {
Sreeram Ramachandran1201e842014-07-01 15:06:05 -0700207 ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response));
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900208 ret = -EBADMSG;
209 }
210 } else {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700211 ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno));
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900212 ret = -errno;
213 }
214
215 if (sock != -1) {
216 close(sock);
217 }
218
219 return ret;
220}
221
Sreeram Ramachandran8fe9c8e2014-04-16 12:08:05 -0700222// Adds or removes a routing rule for IPv4 and IPv6.
223//
224// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the rule
225// returns ENETUNREACH.
226// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is
227// ignored.
228// + If |interface| is non-NULL, the rule matches the specified outgoing interface.
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900229//
230// Returns 0 on success or negative errno on failure.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700231WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table,
232 uint32_t fwmark, uint32_t mask, const char* interface,
233 uid_t uidStart, uid_t uidEnd) {
234 // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask.
235 if (fwmark & ~mask) {
236 ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark);
237 return -ERANGE;
238 }
239
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900240 // The interface name must include exactly one terminating NULL and be properly padded, or older
241 // kernels will refuse to delete rules.
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900242 uint16_t paddingLength = 0;
243 size_t interfaceLength = 0;
244 char oifname[IFNAMSIZ];
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700245 if (interface != OIF_NONE) {
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900246 interfaceLength = strlcpy(oifname, interface, IFNAMSIZ) + 1;
247 if (interfaceLength > IFNAMSIZ) {
Sreeram Ramachandrancf891382014-07-01 15:49:20 -0700248 ALOGE("interface name too long (%zu > %u)", interfaceLength, IFNAMSIZ);
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900249 return -ENAMETOOLONG;
Sreeram Ramachandran8fe9c8e2014-04-16 12:08:05 -0700250 }
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900251 paddingLength = RTA_SPACE(interfaceLength) - RTA_LENGTH(interfaceLength);
252 }
253
Lorenzo Colitti59656512014-06-25 03:20:29 +0900254 // Either both start and end UID must be specified, or neither.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700255 if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) {
Sreeram Ramachandrancf891382014-07-01 15:49:20 -0700256 ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd);
Lorenzo Colitti59656512014-06-25 03:20:29 +0900257 return -EUSERS;
258 }
Lorenzo Colitti72723682014-06-26 13:51:10 +0900259 bool isUidRule = (uidStart != INVALID_UID);
Lorenzo Colitti59656512014-06-25 03:20:29 +0900260
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900261 // Assemble a rule request and put it in an array of iovec structures.
262 fib_rule_hdr rule = {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700263 .action = static_cast<uint8_t>(table != RT_TABLE_UNSPEC ? FR_ACT_TO_TBL :
264 FR_ACT_UNREACHABLE),
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900265 };
266
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700267 rtattr fraOifname = { U16_RTA_LENGTH(interfaceLength), FRA_OIFNAME };
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900268
269 iovec iov[] = {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700270 { NULL, 0 },
271 { &rule, sizeof(rule) },
272 { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) },
273 { &priority, sizeof(priority) },
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700274 { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 },
275 { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 },
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700276 { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 },
277 { &fwmark, mask ? sizeof(fwmark) : 0 },
278 { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 },
279 { &mask, mask ? sizeof(mask) : 0 },
280 { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 },
281 { &uidStart, isUidRule ? sizeof(uidStart) : 0 },
282 { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 },
283 { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 },
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700284 { &fraOifname, interface != OIF_NONE ? sizeof(fraOifname) : 0 },
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700285 { oifname, interfaceLength },
286 { PADDING_BUFFER, paddingLength },
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900287 };
288
Lorenzo Colitti72723682014-06-26 13:51:10 +0900289 uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700290 for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) {
291 rule.family = AF_FAMILIES[i];
292 if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) {
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900293 return ret;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700294 }
295 }
296
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900297 return 0;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700298}
299
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900300// Adds or deletes an IPv4 or IPv6 route.
301// Returns 0 on success or negative errno on failure.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700302WARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface,
303 const char* destination, const char* nexthop) {
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900304 // At least the destination must be non-null.
305 if (!destination) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700306 ALOGE("null destination");
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900307 return -EFAULT;
308 }
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700309
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900310 // Parse the prefix.
311 uint8_t rawAddress[sizeof(in6_addr)];
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700312 uint8_t family;
313 uint8_t prefixLength;
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900314 int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress),
315 &prefixLength);
316 if (rawLength < 0) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700317 ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength));
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900318 return rawLength;
319 }
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700320
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900321 if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) {
Sreeram Ramachandran1201e842014-07-01 15:06:05 -0700322 ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress));
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900323 return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6.
324 }
325
326 // If an interface was specified, find the ifindex.
327 uint32_t ifindex;
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700328 if (interface != OIF_NONE) {
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900329 ifindex = if_nametoindex(interface);
330 if (!ifindex) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700331 ALOGE("cannot find interface %s", interface);
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900332 return -ENODEV;
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700333 }
334 }
335
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900336 // If a nexthop was specified, parse it as the same family as the prefix.
337 uint8_t rawNexthop[sizeof(in6_addr)];
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700338 if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) {
339 ALOGE("inet_pton failed for nexthop %s", nexthop);
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900340 return -EINVAL;
341 }
342
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900343 // Assemble a rtmsg and put it in an array of iovec structures.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700344 rtmsg route = {
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900345 .rtm_protocol = RTPROT_STATIC,
346 .rtm_type = RTN_UNICAST,
347 .rtm_family = family,
348 .rtm_dst_len = prefixLength,
349 };
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900350
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700351 rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST };
352 rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY };
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900353
354 iovec iov[] = {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700355 { NULL, 0 },
356 { &route, sizeof(route) },
357 { &RTATTR_TABLE, sizeof(RTATTR_TABLE) },
358 { &table, sizeof(table) },
359 { &rtaDst, sizeof(rtaDst) },
360 { rawAddress, static_cast<size_t>(rawLength) },
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700361 { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 },
362 { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 },
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700363 { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 },
364 { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 },
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900365 };
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900366
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700367 uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS :
368 NETLINK_REQUEST_FLAGS;
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900369 return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov));
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700370}
371
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700372// Add rules to allow legacy routes added through the requestRouteToHost() API.
373WARN_UNUSED_RESULT int AddLegacyRouteRules() {
374 Fwmark fwmark;
375 Fwmark mask;
376
377 fwmark.explicitlySelected = false;
378 mask.explicitlySelected = true;
379
380 // Rules to allow legacy routes to override the default network.
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700381 if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM,
382 fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID,
383 INVALID_UID)) {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700384 return ret;
385 }
386 if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK,
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700387 ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700388 mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID)) {
389 return ret;
390 }
391
392 fwmark.permission = PERMISSION_SYSTEM;
393 mask.permission = PERMISSION_SYSTEM;
394
395 // A rule to allow legacy routes from system apps to override VPNs.
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700396 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM,
397 fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700398}
399
400// Add a new rule to look up the 'main' table, with the same selectors as the "default network"
401// rule, but with a lower priority. Since the default network rule points to a table with a default
402// route, the rule we're adding will never be used for normal routing lookups. However, the kernel
403// may fall-through to it to find directly-connected routes when it validates that a nexthop (in a
404// route being added) is reachable.
405WARN_UNUSED_RESULT int AddDirectlyConnectedRule() {
406 Fwmark fwmark;
407 Fwmark mask;
408
409 fwmark.netId = NETID_UNSET;
410 mask.netId = FWMARK_NET_ID_MASK;
411
412 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN,
413 fwmark.intValue, mask.intValue, OIF_NONE, UID_ROOT, UID_ROOT);
414}
415
416// Add a rule to preempt the pre-defined "from all lookup main" rule. Packets that reach this rule
417// will be null-routed, and won't fall-through to the main table.
418WARN_UNUSED_RESULT int AddUnreachableRule() {
419 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET,
420 MARK_UNSET, OIF_NONE, INVALID_UID, INVALID_UID);
421}
422
423// An iptables rule to mark incoming packets on a network with the netId of the network.
424//
425// This is so that the kernel can:
426// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping
427// replies, SYN-ACKs, etc).
428// + Mark sockets that accept connections from this interface so that the connection stays on the
429// same interface.
430WARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface,
431 Permission permission, bool add) {
432 Fwmark fwmark;
433
434 fwmark.netId = netId;
435 fwmark.explicitlySelected = true;
436 fwmark.protectedFromVpn = true;
437 fwmark.permission = permission;
438
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700439 char markString[UINT32_HEX_STRLEN];
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700440 snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue);
441
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700442 if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j",
443 "MARK", "--set-mark", markString, NULL)) {
444 ALOGE("failed to change iptables rule that sets incoming packet mark");
445 return -EREMOTEIO;
446 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700447
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700448 return 0;
449}
450
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700451// A rule to route traffic based on an explicitly chosen network.
452//
453// Supports apps that use the multinetwork APIs to restrict their traffic to a network.
454//
455// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need
456// to check it again in the rules here, because a network's permissions may have been updated via
457// modifyNetworkPermission().
458WARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table,
459 Permission permission, uid_t uidStart,
460 uid_t uidEnd, bool add) {
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700461 Fwmark fwmark;
462 Fwmark mask;
463
464 fwmark.netId = netId;
465 mask.netId = FWMARK_NET_ID_MASK;
466
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700467 fwmark.explicitlySelected = true;
468 mask.explicitlySelected = true;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700469
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700470 fwmark.permission = permission;
471 mask.permission = permission;
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700472
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700473 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table,
474 fwmark.intValue, mask.intValue, OIF_NONE, uidStart, uidEnd);
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700475}
476
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700477// A rule to route traffic based on a chosen outgoing interface.
478//
479// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows
480// the outgoing interface (typically for link-local communications).
481WARN_UNUSED_RESULT int modifyOutputInterfaceRule(const char* interface, uint32_t table,
482 Permission permission, uid_t uidStart,
483 uid_t uidEnd, bool add) {
484 Fwmark fwmark;
485 Fwmark mask;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700486
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700487 fwmark.permission = permission;
488 mask.permission = permission;
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700489
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700490 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table,
491 fwmark.intValue, mask.intValue, interface, uidStart, uidEnd);
492}
493
494// A rule to route traffic based on the chosen network.
495//
496// This is for sockets that have not explicitly requested a particular network, but have been
497// bound to one when they called connect(). This ensures that sockets connected on a particular
498// network stay on that network even if the default network changes.
499WARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table,
500 Permission permission, bool add) {
501 Fwmark fwmark;
502 Fwmark mask;
503
504 fwmark.netId = netId;
505 mask.netId = FWMARK_NET_ID_MASK;
506
507 fwmark.explicitlySelected = false;
508 mask.explicitlySelected = true;
509
510 fwmark.permission = permission;
511 mask.permission = permission;
512
513 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table,
514 fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID);
515}
516
517// A rule to route all traffic from a given set of UIDs to go over the VPN.
518//
519// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may
520// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to
521// bypass the VPN if the protectedFromVpn bit is set.
522WARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd,
523 bool add) {
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700524 Fwmark fwmark;
525 Fwmark mask;
526
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700527 fwmark.protectedFromVpn = false;
528 mask.protectedFromVpn = true;
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700529
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700530 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_SECURE_VPN, table,
531 fwmark.intValue, mask.intValue, OIF_NONE, uidStart, uidEnd);
532}
533
534// A rule to allow system apps to send traffic over this VPN even if they are not part of the target
535// set of UIDs.
536//
537// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the
538// target set, but where the DnsProxyListener itself is not.
539WARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool add) {
540 Fwmark fwmark;
541 Fwmark mask;
542
543 fwmark.netId = netId;
544 mask.netId = FWMARK_NET_ID_MASK;
545
546 fwmark.permission = PERMISSION_SYSTEM;
547 mask.permission = PERMISSION_SYSTEM;
548
549 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_SECURE_VPN, table,
550 fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID);
551}
552
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700553// A rule to allow local network routes to override the default network.
554WARN_UNUSED_RESULT int modifyLocalOverrideRule(uint32_t table, bool add) {
555 Fwmark fwmark;
556 Fwmark mask;
557
558 fwmark.explicitlySelected = false;
559 mask.explicitlySelected = true;
560
561 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_LOCAL_NETWORK, table,
562 fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID);
563}
564
565WARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) {
566 uint32_t table = getRouteTableForInterface(interface);
567 if (table == RT_TABLE_UNSPEC) {
568 return -ESRCH;
569 }
570
571 if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) {
572 return ret;
573 }
574 if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, INVALID_UID, INVALID_UID,
575 add)) {
576 return ret;
577 }
578 if (int ret = modifyOutputInterfaceRule(interface, table, PERMISSION_NONE, INVALID_UID,
579 INVALID_UID, add)) {
580 return ret;
581 }
582 return modifyLocalOverrideRule(table, add);
583}
584
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700585WARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface,
586 Permission permission, bool add) {
587 uint32_t table = getRouteTableForInterface(interface);
588 if (table == RT_TABLE_UNSPEC) {
589 return -ESRCH;
590 }
591
592 if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) {
593 return ret;
594 }
595 if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID,
596 add)) {
597 return ret;
598 }
599 if (int ret = modifyOutputInterfaceRule(interface, table, permission, INVALID_UID, INVALID_UID,
600 add)) {
601 return ret;
602 }
603 return modifyImplicitNetworkRule(netId, table, permission, add);
604}
605
606WARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface,
607 const UidRanges& uidRanges, bool add,
608 bool modifyNonUidBasedRules) {
609 uint32_t table = getRouteTableForInterface(interface);
610 if (table == RT_TABLE_UNSPEC) {
611 return -ESRCH;
612 }
613
Sreeram Ramachandrane09b20a2014-07-05 17:15:14 -0700614 for (const UidRanges::Range& range : uidRanges.getRanges()) {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700615 if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first,
616 range.second, add)) {
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700617 return ret;
618 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700619 if (int ret = modifyOutputInterfaceRule(interface, table, PERMISSION_NONE, range.first,
620 range.second, add)) {
621 return ret;
622 }
623 if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, add)) {
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700624 return ret;
625 }
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700626 }
627
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700628 if (modifyNonUidBasedRules) {
629 if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) {
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700630 return ret;
631 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700632 if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT,
633 add)) {
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700634 return ret;
635 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700636 return modifyVpnSystemPermissionRule(netId, table, add);
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700637 }
638
639 return 0;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700640}
641
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700642WARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface,
643 Permission permission) {
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700644 uint32_t table = getRouteTableForInterface(interface);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700645 if (table == RT_TABLE_UNSPEC) {
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900646 return -ESRCH;
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700647 }
648
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700649 Fwmark fwmark;
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700650 Fwmark mask;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700651
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700652 fwmark.netId = NETID_UNSET;
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700653 mask.netId = FWMARK_NET_ID_MASK;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700654
655 fwmark.permission = permission;
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700656 mask.permission = permission;
657
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700658 return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue,
659 mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID);
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700660}
661
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700662// 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 +0900663// route, to the main table as well.
664// Returns 0 on success or negative errno on failure.
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700665WARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination,
666 const char* nexthop, RouteController::TableType tableType) {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700667 uint32_t table;
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700668 switch (tableType) {
669 case RouteController::INTERFACE: {
670 table = getRouteTableForInterface(interface);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700671 if (table == RT_TABLE_UNSPEC) {
672 return -ESRCH;
673 }
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700674 break;
675 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700676 case RouteController::LEGACY_NETWORK: {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700677 table = ROUTE_TABLE_LEGACY_NETWORK;
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700678 break;
679 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700680 case RouteController::LEGACY_SYSTEM: {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700681 table = ROUTE_TABLE_LEGACY_SYSTEM;
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700682 break;
683 }
684 }
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700685
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900686 int ret = modifyIpRoute(action, table, interface, destination, nexthop);
Sreeram Ramachandran1077d292014-06-27 06:42:11 -0700687 // We allow apps to call requestRouteToHost() multiple times with the same route, so ignore
688 // EEXIST failures when adding routes to legacy tables.
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700689 if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST &&
690 tableType != RouteController::INTERFACE)) {
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900691 return ret;
Sreeram Ramachandranc9213372014-04-16 12:32:18 -0700692 }
693
694 // If there's no nexthop, this is a directly connected route. Add it to the main table also, to
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900695 // let the kernel find it when validating nexthops when global routes are added.
696 if (!nexthop) {
697 ret = modifyIpRoute(action, RT_TABLE_MAIN, interface, destination, NULL);
698 // A failure with action == ADD && errno == EEXIST means that the route already exists in
699 // the main table, perhaps because the kernel added it automatically as part of adding the
700 // IP address to the interface. Ignore this, but complain about everything else.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700701 if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) {
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900702 return ret;
703 }
Sreeram Ramachandranc9213372014-04-16 12:32:18 -0700704 }
705
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900706 return 0;
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700707}
708
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700709// Returns 0 on success or negative errno on failure.
710WARN_UNUSED_RESULT int flushRoutes(const char* interface) {
Sreeram Ramachandran92b66c42014-04-15 14:28:55 -0700711 uint32_t table = getRouteTableForInterface(interface);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700712 if (table == RT_TABLE_UNSPEC) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700713 return -ESRCH;
Sreeram Ramachandran92b66c42014-04-15 14:28:55 -0700714 }
715
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900716 char tableString[UINT32_STRLEN];
717 snprintf(tableString, sizeof(tableString), "%u", table);
718
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700719 for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) {
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900720 const char* argv[] = {
721 IP_PATH,
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700722 IP_VERSIONS[i],
Sreeram Ramachandran72999d62014-07-02 18:06:34 -0700723 "route",
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900724 "flush",
725 "table",
726 tableString,
727 };
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700728 if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) {
729 ALOGE("failed to flush routes");
730 return -EREMOTEIO;
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900731 }
732 }
733
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700734 interfaceToTable.erase(interface);
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700735 return 0;
Sreeram Ramachandran92b66c42014-04-15 14:28:55 -0700736}
737
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700738} // namespace
739
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700740int RouteController::Init() {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700741 if (int ret = AddDirectlyConnectedRule()) {
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700742 return ret;
743 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700744 if (int ret = AddLegacyRouteRules()) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700745 return ret;
746 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700747 // TODO: Enable once we are sure everything works.
748 if (false) {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700749 if (int ret = AddUnreachableRule()) {
750 return ret;
751 }
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700752 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700753 updateTableNamesFile();
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700754 return 0;
Sreeram Ramachandran8fe9c8e2014-04-16 12:08:05 -0700755}
756
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700757int RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) {
758 if (int ret = modifyLocalNetwork(netId, interface, ACTION_ADD)) {
759 return ret;
760 }
761 updateTableNamesFile();
762 return 0;
763}
764
765int RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) {
766 if (int ret = modifyLocalNetwork(netId, interface, ACTION_DEL)) {
767 return ret;
768 }
769 if (int ret = flushRoutes(interface)) {
770 return ret;
771 }
772 updateTableNamesFile();
773 return 0;
774}
775
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700776int RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface,
777 Permission permission) {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700778 if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) {
779 return ret;
780 }
781 updateTableNamesFile();
782 return 0;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700783}
784
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700785int RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface,
786 Permission permission) {
787 if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700788 return ret;
789 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700790 if (int ret = flushRoutes(interface)) {
791 return ret;
792 }
793 updateTableNamesFile();
794 return 0;
Sreeram Ramachandran379bd332014-04-10 19:58:06 -0700795}
796
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700797int RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface,
798 const UidRanges& uidRanges) {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700799 if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, ACTION_ADD,
800 MODIFY_NON_UID_BASED_RULES)) {
801 return ret;
802 }
803 updateTableNamesFile();
804 return 0;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700805}
806
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700807int RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface,
808 const UidRanges& uidRanges) {
809 if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, ACTION_DEL,
810 MODIFY_NON_UID_BASED_RULES)) {
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700811 return ret;
812 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700813 if (int ret = flushRoutes(interface)) {
814 return ret;
815 }
816 updateTableNamesFile();
817 return 0;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700818}
819
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700820int RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface,
821 Permission oldPermission,
822 Permission newPermission) {
Sreeram Ramachandran379bd332014-04-10 19:58:06 -0700823 // Add the new rules before deleting the old ones, to avoid race conditions.
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700824 if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700825 return ret;
826 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700827 return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL);
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700828}
829
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700830int RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface,
831 const UidRanges& uidRanges) {
832 return modifyVirtualNetwork(netId, interface, uidRanges, ACTION_ADD,
833 !MODIFY_NON_UID_BASED_RULES);
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700834}
835
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700836int RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface,
837 const UidRanges& uidRanges) {
838 return modifyVirtualNetwork(netId, interface, uidRanges, ACTION_DEL,
839 !MODIFY_NON_UID_BASED_RULES);
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700840}
841
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700842int RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) {
843 return modifyDefaultNetwork(RTM_NEWRULE, interface, permission);
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700844}
845
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700846int RouteController::removeInterfaceFromDefaultNetwork(const char* interface,
847 Permission permission) {
848 return modifyDefaultNetwork(RTM_DELRULE, interface, permission);
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700849}
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700850
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700851int RouteController::addRoute(const char* interface, const char* destination, const char* nexthop,
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700852 TableType tableType) {
853 return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType);
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700854}
855
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900856int RouteController::removeRoute(const char* interface, const char* destination,
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700857 const char* nexthop, TableType tableType) {
858 return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType);
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700859}