blob: 660413961fd720c90736a51b80ce81a7c9e191b5 [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
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;
45// const uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000;
46// 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
Lorenzo Colitti59656512014-06-25 03:20:29 +090060// TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not
61// upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make
62// it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert
63// that will warn us if upstream has given these values some other meaning.
64const uint16_t FRA_UID_START = 18;
65const uint16_t FRA_UID_END = 19;
66static_assert(FRA_UID_START > FRA_MAX,
67 "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. "
68 "Check that these values match what the kernel does and then update this assertion.");
69
Lorenzo Colitti72723682014-06-26 13:51:10 +090070const uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK;
71const uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL;
Lorenzo Colitti4753afd2014-06-20 23:03:29 +090072
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070073const sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0};
74
75const uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6};
76
77const char* const IP_VERSIONS[] = {"-4", "-6"};
78
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -070079const uid_t UID_ROOT = 0;
80const char* const OIF_NONE = NULL;
81const bool ACTION_ADD = true;
82const bool ACTION_DEL = false;
83const bool MODIFY_NON_UID_BASED_RULES = true;
84
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -070085const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables";
86
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -070087// Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'"
88// warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t).
89constexpr uint16_t U16_RTA_LENGTH(uint16_t x) {
90 return RTA_LENGTH(x);
91}
92
93// These are practically const, but can't be declared so, because they are used to initialize
94// non-const pointers ("void* iov_base") in iovec arrays.
95rtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY };
96rtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE };
97rtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK };
98rtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK };
99rtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START };
100rtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END };
101
102rtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE };
103rtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF };
104
105uint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0};
106
107// END CONSTANTS ----------------------------------------------------------------------------------
108
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700109// No locks needed because RouteController is accessed only from one thread (in CommandListener).
110std::map<std::string, uint32_t> interfaceToTable;
Paul Jensena561e122014-06-12 16:46:37 -0400111
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700112uint32_t getRouteTableForInterface(const char* interface) {
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700113 uint32_t index = if_nametoindex(interface);
Paul Jensena561e122014-06-12 16:46:37 -0400114 if (index) {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700115 index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX;
116 interfaceToTable[interface] = index;
117 return index;
Paul Jensena561e122014-06-12 16:46:37 -0400118 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700119 // If the interface goes away if_nametoindex() will return 0 but we still need to know
120 // the index so we can remove the rules and routes.
121 auto iter = interfaceToTable.find(interface);
122 if (iter == interfaceToTable.end()) {
123 ALOGE("cannot find interface %s", interface);
124 return RT_TABLE_UNSPEC;
125 }
126 return iter->second;
127}
128
129void addTableName(uint32_t table, const std::string& name, std::string* contents) {
130 char tableString[UINT32_STRLEN];
131 snprintf(tableString, sizeof(tableString), "%u", table);
132 *contents += tableString;
133 *contents += " ";
134 *contents += name;
135 *contents += "\n";
136}
137
138// Doesn't return success/failure as the file is optional; it's okay if we fail to update it.
139void updateTableNamesFile() {
140 std::string contents;
141 addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents);
142 addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents);
143 for (const auto& entry : interfaceToTable) {
144 addTableName(entry.second, entry.first, &contents);
145 }
146
147 mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r--
148 int fd = open(RT_TABLES_PATH, O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW | O_CLOEXEC, mode);
149 if (fd == -1) {
150 ALOGE("failed to create %s (%s)", RT_TABLES_PATH, strerror(errno));
151 return;
152 }
153 // File creation is affected by umask, so make sure the right mode bits are set.
154 if (fchmod(fd, mode) == -1) {
155 ALOGE("failed to chmod %s to mode 0%o (%s)", RT_TABLES_PATH, mode, strerror(errno));
156 }
157 ssize_t bytesWritten = write(fd, contents.data(), contents.size());
158 if (bytesWritten != static_cast<ssize_t>(contents.size())) {
159 ALOGE("failed to write to %s (%zd vs %zu bytes) (%s)", RT_TABLES_PATH, bytesWritten,
160 contents.size(), strerror(errno));
161 }
162 close(fd);
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700163}
164
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900165// Sends a netlink request and expects an ack.
166// |iov| is an array of struct iovec that contains the netlink message payload.
167// The netlink header is generated by this function based on |action| and |flags|.
168// Returns -errno if there was an error or if the kernel reported an error.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700169WARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) {
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900170 nlmsghdr nlmsg = {
171 .nlmsg_type = action,
172 .nlmsg_flags = flags,
173 };
174 iov[0].iov_base = &nlmsg;
175 iov[0].iov_len = sizeof(nlmsg);
176 for (int i = 0; i < iovlen; ++i) {
177 nlmsg.nlmsg_len += iov[i].iov_len;
178 }
179
180 int ret;
181 struct {
182 nlmsghdr msg;
183 nlmsgerr err;
184 } response;
185
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900186 int sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
187 if (sock != -1 &&
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700188 connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS),
189 sizeof(NETLINK_ADDRESS)) != -1 &&
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900190 writev(sock, iov, iovlen) != -1 &&
191 (ret = recv(sock, &response, sizeof(response), 0)) != -1) {
192 if (ret == sizeof(response)) {
193 ret = response.err.error; // Netlink errors are negative errno.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700194 if (ret) {
195 ALOGE("netlink response contains error (%s)", strerror(-ret));
196 }
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900197 } else {
Sreeram Ramachandran1201e842014-07-01 15:06:05 -0700198 ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response));
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900199 ret = -EBADMSG;
200 }
201 } else {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700202 ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno));
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900203 ret = -errno;
204 }
205
206 if (sock != -1) {
207 close(sock);
208 }
209
210 return ret;
211}
212
Sreeram Ramachandran8fe9c8e2014-04-16 12:08:05 -0700213// Adds or removes a routing rule for IPv4 and IPv6.
214//
215// + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the rule
216// returns ENETUNREACH.
217// + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is
218// ignored.
219// + If |interface| is non-NULL, the rule matches the specified outgoing interface.
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900220//
221// Returns 0 on success or negative errno on failure.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700222WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table,
223 uint32_t fwmark, uint32_t mask, const char* interface,
224 uid_t uidStart, uid_t uidEnd) {
225 // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask.
226 if (fwmark & ~mask) {
227 ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark);
228 return -ERANGE;
229 }
230
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900231 // The interface name must include exactly one terminating NULL and be properly padded, or older
232 // kernels will refuse to delete rules.
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900233 uint16_t paddingLength = 0;
234 size_t interfaceLength = 0;
235 char oifname[IFNAMSIZ];
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700236 if (interface != OIF_NONE) {
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900237 interfaceLength = strlcpy(oifname, interface, IFNAMSIZ) + 1;
238 if (interfaceLength > IFNAMSIZ) {
Sreeram Ramachandrancf891382014-07-01 15:49:20 -0700239 ALOGE("interface name too long (%zu > %u)", interfaceLength, IFNAMSIZ);
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900240 return -ENAMETOOLONG;
Sreeram Ramachandran8fe9c8e2014-04-16 12:08:05 -0700241 }
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900242 paddingLength = RTA_SPACE(interfaceLength) - RTA_LENGTH(interfaceLength);
243 }
244
Lorenzo Colitti59656512014-06-25 03:20:29 +0900245 // Either both start and end UID must be specified, or neither.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700246 if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) {
Sreeram Ramachandrancf891382014-07-01 15:49:20 -0700247 ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd);
Lorenzo Colitti59656512014-06-25 03:20:29 +0900248 return -EUSERS;
249 }
Lorenzo Colitti72723682014-06-26 13:51:10 +0900250 bool isUidRule = (uidStart != INVALID_UID);
Lorenzo Colitti59656512014-06-25 03:20:29 +0900251
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900252 // Assemble a rule request and put it in an array of iovec structures.
253 fib_rule_hdr rule = {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700254 .action = static_cast<uint8_t>(table != RT_TABLE_UNSPEC ? FR_ACT_TO_TBL :
255 FR_ACT_UNREACHABLE),
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900256 };
257
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700258 rtattr fraOifname = { U16_RTA_LENGTH(interfaceLength), FRA_OIFNAME };
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900259
260 iovec iov[] = {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700261 { NULL, 0 },
262 { &rule, sizeof(rule) },
263 { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) },
264 { &priority, sizeof(priority) },
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700265 { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 },
266 { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 },
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700267 { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 },
268 { &fwmark, mask ? sizeof(fwmark) : 0 },
269 { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 },
270 { &mask, mask ? sizeof(mask) : 0 },
271 { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 },
272 { &uidStart, isUidRule ? sizeof(uidStart) : 0 },
273 { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 },
274 { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 },
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700275 { &fraOifname, interface != OIF_NONE ? sizeof(fraOifname) : 0 },
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700276 { oifname, interfaceLength },
277 { PADDING_BUFFER, paddingLength },
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900278 };
279
Lorenzo Colitti72723682014-06-26 13:51:10 +0900280 uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700281 for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) {
282 rule.family = AF_FAMILIES[i];
283 if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) {
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900284 return ret;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700285 }
286 }
287
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900288 return 0;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700289}
290
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900291// Adds or deletes an IPv4 or IPv6 route.
292// Returns 0 on success or negative errno on failure.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700293WARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface,
294 const char* destination, const char* nexthop) {
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900295 // At least the destination must be non-null.
296 if (!destination) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700297 ALOGE("null destination");
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900298 return -EFAULT;
299 }
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700300
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900301 // Parse the prefix.
302 uint8_t rawAddress[sizeof(in6_addr)];
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700303 uint8_t family;
304 uint8_t prefixLength;
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900305 int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress),
306 &prefixLength);
307 if (rawLength < 0) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700308 ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength));
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900309 return rawLength;
310 }
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700311
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900312 if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) {
Sreeram Ramachandran1201e842014-07-01 15:06:05 -0700313 ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress));
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900314 return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6.
315 }
316
317 // If an interface was specified, find the ifindex.
318 uint32_t ifindex;
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700319 if (interface != OIF_NONE) {
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900320 ifindex = if_nametoindex(interface);
321 if (!ifindex) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700322 ALOGE("cannot find interface %s", interface);
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900323 return -ENODEV;
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700324 }
325 }
326
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900327 // If a nexthop was specified, parse it as the same family as the prefix.
328 uint8_t rawNexthop[sizeof(in6_addr)];
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700329 if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) {
330 ALOGE("inet_pton failed for nexthop %s", nexthop);
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900331 return -EINVAL;
332 }
333
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900334 // Assemble a rtmsg and put it in an array of iovec structures.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700335 rtmsg route = {
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900336 .rtm_protocol = RTPROT_STATIC,
337 .rtm_type = RTN_UNICAST,
338 .rtm_family = family,
339 .rtm_dst_len = prefixLength,
340 };
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900341
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700342 rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST };
343 rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY };
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900344
345 iovec iov[] = {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700346 { NULL, 0 },
347 { &route, sizeof(route) },
348 { &RTATTR_TABLE, sizeof(RTATTR_TABLE) },
349 { &table, sizeof(table) },
350 { &rtaDst, sizeof(rtaDst) },
351 { rawAddress, static_cast<size_t>(rawLength) },
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700352 { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 },
353 { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 },
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700354 { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 },
355 { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 },
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900356 };
Lorenzo Colittiba25df92014-06-18 00:22:17 +0900357
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700358 uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS :
359 NETLINK_REQUEST_FLAGS;
Lorenzo Colitti4753afd2014-06-20 23:03:29 +0900360 return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov));
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700361}
362
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700363// Add rules to allow legacy routes added through the requestRouteToHost() API.
364WARN_UNUSED_RESULT int AddLegacyRouteRules() {
365 Fwmark fwmark;
366 Fwmark mask;
367
368 fwmark.explicitlySelected = false;
369 mask.explicitlySelected = true;
370
371 // Rules to allow legacy routes to override the default network.
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700372 if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM,
373 fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID,
374 INVALID_UID)) {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700375 return ret;
376 }
377 if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK,
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700378 ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue,
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700379 mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID)) {
380 return ret;
381 }
382
383 fwmark.permission = PERMISSION_SYSTEM;
384 mask.permission = PERMISSION_SYSTEM;
385
386 // A rule to allow legacy routes from system apps to override VPNs.
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700387 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM,
388 fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700389}
390
391// Add a new rule to look up the 'main' table, with the same selectors as the "default network"
392// rule, but with a lower priority. Since the default network rule points to a table with a default
393// route, the rule we're adding will never be used for normal routing lookups. However, the kernel
394// may fall-through to it to find directly-connected routes when it validates that a nexthop (in a
395// route being added) is reachable.
396WARN_UNUSED_RESULT int AddDirectlyConnectedRule() {
397 Fwmark fwmark;
398 Fwmark mask;
399
400 fwmark.netId = NETID_UNSET;
401 mask.netId = FWMARK_NET_ID_MASK;
402
403 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN,
404 fwmark.intValue, mask.intValue, OIF_NONE, UID_ROOT, UID_ROOT);
405}
406
407// Add a rule to preempt the pre-defined "from all lookup main" rule. Packets that reach this rule
408// will be null-routed, and won't fall-through to the main table.
409WARN_UNUSED_RESULT int AddUnreachableRule() {
410 return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET,
411 MARK_UNSET, OIF_NONE, INVALID_UID, INVALID_UID);
412}
413
414// An iptables rule to mark incoming packets on a network with the netId of the network.
415//
416// This is so that the kernel can:
417// + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping
418// replies, SYN-ACKs, etc).
419// + Mark sockets that accept connections from this interface so that the connection stays on the
420// same interface.
421WARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface,
422 Permission permission, bool add) {
423 Fwmark fwmark;
424
425 fwmark.netId = netId;
426 fwmark.explicitlySelected = true;
427 fwmark.protectedFromVpn = true;
428 fwmark.permission = permission;
429
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700430 char markString[UINT32_HEX_STRLEN];
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700431 snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue);
432
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700433 if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j",
434 "MARK", "--set-mark", markString, NULL)) {
435 ALOGE("failed to change iptables rule that sets incoming packet mark");
436 return -EREMOTEIO;
437 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700438
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700439 return 0;
440}
441
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700442// A rule to route traffic based on an explicitly chosen network.
443//
444// Supports apps that use the multinetwork APIs to restrict their traffic to a network.
445//
446// Even though we check permissions at the time we set a netId into the fwmark of a socket, we need
447// to check it again in the rules here, because a network's permissions may have been updated via
448// modifyNetworkPermission().
449WARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table,
450 Permission permission, uid_t uidStart,
451 uid_t uidEnd, bool add) {
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700452 Fwmark fwmark;
453 Fwmark mask;
454
455 fwmark.netId = netId;
456 mask.netId = FWMARK_NET_ID_MASK;
457
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700458 fwmark.explicitlySelected = true;
459 mask.explicitlySelected = true;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700460
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700461 fwmark.permission = permission;
462 mask.permission = permission;
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700463
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700464 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table,
465 fwmark.intValue, mask.intValue, OIF_NONE, uidStart, uidEnd);
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700466}
467
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700468// A rule to route traffic based on a chosen outgoing interface.
469//
470// Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows
471// the outgoing interface (typically for link-local communications).
472WARN_UNUSED_RESULT int modifyOutputInterfaceRule(const char* interface, uint32_t table,
473 Permission permission, uid_t uidStart,
474 uid_t uidEnd, bool add) {
475 Fwmark fwmark;
476 Fwmark mask;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700477
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700478 fwmark.permission = permission;
479 mask.permission = permission;
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700480
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700481 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table,
482 fwmark.intValue, mask.intValue, interface, uidStart, uidEnd);
483}
484
485// A rule to route traffic based on the chosen network.
486//
487// This is for sockets that have not explicitly requested a particular network, but have been
488// bound to one when they called connect(). This ensures that sockets connected on a particular
489// network stay on that network even if the default network changes.
490WARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table,
491 Permission permission, bool add) {
492 Fwmark fwmark;
493 Fwmark mask;
494
495 fwmark.netId = netId;
496 mask.netId = FWMARK_NET_ID_MASK;
497
498 fwmark.explicitlySelected = false;
499 mask.explicitlySelected = true;
500
501 fwmark.permission = permission;
502 mask.permission = permission;
503
504 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table,
505 fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID);
506}
507
508// A rule to route all traffic from a given set of UIDs to go over the VPN.
509//
510// Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may
511// have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to
512// bypass the VPN if the protectedFromVpn bit is set.
513WARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd,
514 bool add) {
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700515 Fwmark fwmark;
516 Fwmark mask;
517
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700518 fwmark.protectedFromVpn = false;
519 mask.protectedFromVpn = true;
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700520
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700521 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_SECURE_VPN, table,
522 fwmark.intValue, mask.intValue, OIF_NONE, uidStart, uidEnd);
523}
524
525// A rule to allow system apps to send traffic over this VPN even if they are not part of the target
526// set of UIDs.
527//
528// This is needed for DnsProxyListener to correctly resolve a request for a user who is in the
529// target set, but where the DnsProxyListener itself is not.
530WARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool add) {
531 Fwmark fwmark;
532 Fwmark mask;
533
534 fwmark.netId = netId;
535 mask.netId = FWMARK_NET_ID_MASK;
536
537 fwmark.permission = PERMISSION_SYSTEM;
538 mask.permission = PERMISSION_SYSTEM;
539
540 return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_SECURE_VPN, table,
541 fwmark.intValue, mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID);
542}
543
544WARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface,
545 Permission permission, bool add) {
546 uint32_t table = getRouteTableForInterface(interface);
547 if (table == RT_TABLE_UNSPEC) {
548 return -ESRCH;
549 }
550
551 if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) {
552 return ret;
553 }
554 if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID,
555 add)) {
556 return ret;
557 }
558 if (int ret = modifyOutputInterfaceRule(interface, table, permission, INVALID_UID, INVALID_UID,
559 add)) {
560 return ret;
561 }
562 return modifyImplicitNetworkRule(netId, table, permission, add);
563}
564
565WARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface,
566 const UidRanges& uidRanges, bool add,
567 bool modifyNonUidBasedRules) {
568 uint32_t table = getRouteTableForInterface(interface);
569 if (table == RT_TABLE_UNSPEC) {
570 return -ESRCH;
571 }
572
Sreeram Ramachandrane09b20a2014-07-05 17:15:14 -0700573 for (const UidRanges::Range& range : uidRanges.getRanges()) {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700574 if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first,
575 range.second, add)) {
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700576 return ret;
577 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700578 if (int ret = modifyOutputInterfaceRule(interface, table, PERMISSION_NONE, range.first,
579 range.second, add)) {
580 return ret;
581 }
582 if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, add)) {
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700583 return ret;
584 }
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700585 }
586
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700587 if (modifyNonUidBasedRules) {
588 if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) {
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700589 return ret;
590 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700591 if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT,
592 add)) {
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700593 return ret;
594 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700595 return modifyVpnSystemPermissionRule(netId, table, add);
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700596 }
597
598 return 0;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700599}
600
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700601WARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface,
602 Permission permission) {
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700603 uint32_t table = getRouteTableForInterface(interface);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700604 if (table == RT_TABLE_UNSPEC) {
Lorenzo Colitti96f261e2014-06-23 15:09:54 +0900605 return -ESRCH;
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700606 }
607
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700608 Fwmark fwmark;
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700609 Fwmark mask;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700610
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700611 fwmark.netId = NETID_UNSET;
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700612 mask.netId = FWMARK_NET_ID_MASK;
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700613
614 fwmark.permission = permission;
Sreeram Ramachandran122f5812014-05-11 20:29:49 -0700615 mask.permission = permission;
616
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700617 return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue,
618 mask.intValue, OIF_NONE, INVALID_UID, INVALID_UID);
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700619}
620
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700621// 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 +0900622// route, to the main table as well.
623// Returns 0 on success or negative errno on failure.
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700624WARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination,
625 const char* nexthop, RouteController::TableType tableType) {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700626 uint32_t table;
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700627 switch (tableType) {
628 case RouteController::INTERFACE: {
629 table = getRouteTableForInterface(interface);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700630 if (table == RT_TABLE_UNSPEC) {
631 return -ESRCH;
632 }
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700633 break;
634 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700635 case RouteController::LEGACY_NETWORK: {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700636 table = ROUTE_TABLE_LEGACY_NETWORK;
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700637 break;
638 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700639 case RouteController::LEGACY_SYSTEM: {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700640 table = ROUTE_TABLE_LEGACY_SYSTEM;
Sreeram Ramachandran38b7af12014-05-22 14:21:49 -0700641 break;
642 }
643 }
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700644
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900645 int ret = modifyIpRoute(action, table, interface, destination, nexthop);
Sreeram Ramachandran1077d292014-06-27 06:42:11 -0700646 // We allow apps to call requestRouteToHost() multiple times with the same route, so ignore
647 // EEXIST failures when adding routes to legacy tables.
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700648 if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST &&
649 tableType != RouteController::INTERFACE)) {
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900650 return ret;
Sreeram Ramachandranc9213372014-04-16 12:32:18 -0700651 }
652
653 // 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 +0900654 // let the kernel find it when validating nexthops when global routes are added.
655 if (!nexthop) {
656 ret = modifyIpRoute(action, RT_TABLE_MAIN, interface, destination, NULL);
657 // A failure with action == ADD && errno == EEXIST means that the route already exists in
658 // the main table, perhaps because the kernel added it automatically as part of adding the
659 // IP address to the interface. Ignore this, but complain about everything else.
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700660 if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) {
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900661 return ret;
662 }
Sreeram Ramachandranc9213372014-04-16 12:32:18 -0700663 }
664
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900665 return 0;
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700666}
667
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700668// Returns 0 on success or negative errno on failure.
669WARN_UNUSED_RESULT int flushRoutes(const char* interface) {
Sreeram Ramachandran92b66c42014-04-15 14:28:55 -0700670 uint32_t table = getRouteTableForInterface(interface);
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700671 if (table == RT_TABLE_UNSPEC) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700672 return -ESRCH;
Sreeram Ramachandran92b66c42014-04-15 14:28:55 -0700673 }
674
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900675 char tableString[UINT32_STRLEN];
676 snprintf(tableString, sizeof(tableString), "%u", table);
677
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700678 for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) {
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900679 const char* argv[] = {
680 IP_PATH,
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700681 IP_VERSIONS[i],
Sreeram Ramachandran72999d62014-07-02 18:06:34 -0700682 "route",
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900683 "flush",
684 "table",
685 tableString,
686 };
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700687 if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) {
688 ALOGE("failed to flush routes");
689 return -EREMOTEIO;
Lorenzo Colitti357e5622014-06-17 16:14:17 +0900690 }
691 }
692
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700693 interfaceToTable.erase(interface);
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700694 return 0;
Sreeram Ramachandran92b66c42014-04-15 14:28:55 -0700695}
696
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700697} // namespace
698
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700699int RouteController::Init() {
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700700 if (int ret = AddDirectlyConnectedRule()) {
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700701 return ret;
702 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700703 if (int ret = AddLegacyRouteRules()) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700704 return ret;
705 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700706 // TODO: Enable once we are sure everything works.
707 if (false) {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700708 if (int ret = AddUnreachableRule()) {
709 return ret;
710 }
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700711 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700712 updateTableNamesFile();
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700713 return 0;
Sreeram Ramachandran8fe9c8e2014-04-16 12:08:05 -0700714}
715
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700716int RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface,
717 Permission permission) {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700718 if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) {
719 return ret;
720 }
721 updateTableNamesFile();
722 return 0;
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700723}
724
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700725int RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface,
726 Permission permission) {
727 if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700728 return ret;
729 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700730 if (int ret = flushRoutes(interface)) {
731 return ret;
732 }
733 updateTableNamesFile();
734 return 0;
Sreeram Ramachandran379bd332014-04-10 19:58:06 -0700735}
736
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700737int RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface,
738 const UidRanges& uidRanges) {
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700739 if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, ACTION_ADD,
740 MODIFY_NON_UID_BASED_RULES)) {
741 return ret;
742 }
743 updateTableNamesFile();
744 return 0;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700745}
746
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700747int RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface,
748 const UidRanges& uidRanges) {
749 if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, ACTION_DEL,
750 MODIFY_NON_UID_BASED_RULES)) {
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700751 return ret;
752 }
Sreeram Ramachandran4acd34a2014-07-07 22:11:37 -0700753 if (int ret = flushRoutes(interface)) {
754 return ret;
755 }
756 updateTableNamesFile();
757 return 0;
Sreeram Ramachandran4043f012014-06-23 12:41:37 -0700758}
759
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700760int RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface,
761 Permission oldPermission,
762 Permission newPermission) {
Sreeram Ramachandran379bd332014-04-10 19:58:06 -0700763 // Add the new rules before deleting the old ones, to avoid race conditions.
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700764 if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) {
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700765 return ret;
766 }
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700767 return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL);
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700768}
769
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700770int RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface,
771 const UidRanges& uidRanges) {
772 return modifyVirtualNetwork(netId, interface, uidRanges, ACTION_ADD,
773 !MODIFY_NON_UID_BASED_RULES);
Sreeram Ramachandranb1425cc2014-06-23 18:54:27 -0700774}
775
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700776int RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface,
777 const UidRanges& uidRanges) {
778 return modifyVirtualNetwork(netId, interface, uidRanges, ACTION_DEL,
779 !MODIFY_NON_UID_BASED_RULES);
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700780}
781
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700782int RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) {
783 return modifyDefaultNetwork(RTM_NEWRULE, interface, permission);
Sreeram Ramachandran9c0d3132014-04-10 20:35:04 -0700784}
785
Sreeram Ramachandran5009d5e2014-07-03 12:20:48 -0700786int RouteController::removeInterfaceFromDefaultNetwork(const char* interface,
787 Permission permission) {
788 return modifyDefaultNetwork(RTM_DELRULE, interface, permission);
Sreeram Ramachandran5c181bf2014-04-07 14:10:04 -0700789}
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700790
Sreeram Ramachandranf4f6c8d2014-06-23 09:54:06 -0700791int RouteController::addRoute(const char* interface, const char* destination, const char* nexthop,
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700792 TableType tableType) {
793 return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType);
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700794}
795
Lorenzo Colittif7fc8ec2014-06-18 00:41:58 +0900796int RouteController::removeRoute(const char* interface, const char* destination,
Sreeram Ramachandraneb27b7e2014-07-01 14:30:30 -0700797 const char* nexthop, TableType tableType) {
798 return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType);
Sreeram Ramachandran7619e1b2014-04-15 14:23:08 -0700799}