Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "RouteController.h" |
| 18 | |
| 19 | #include "Fwmark.h" |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 20 | #include "UidRanges.h" |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 21 | |
| 22 | #define LOG_TAG "Netd" |
| 23 | #include "log/log.h" |
| 24 | #include "logwrap/logwrap.h" |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 25 | #include "resolv_netid.h" |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 26 | |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 27 | #include <arpa/inet.h> |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 28 | #include <fcntl.h> |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 29 | #include <linux/fib_rules.h> |
Paul Jensen | a561e12 | 2014-06-12 16:46:37 -0400 | [diff] [blame] | 30 | #include <map> |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 31 | #include <net/if.h> |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 32 | #include <sys/stat.h> |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 33 | |
| 34 | namespace { |
| 35 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 36 | // BEGIN CONSTANTS -------------------------------------------------------------------------------- |
| 37 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 38 | const uint32_t RULE_PRIORITY_VPN_OVERRIDE_SYSTEM = 10000; |
| 39 | // const uint32_t RULE_PRIORITY_VPN_OVERRIDE_LOCAL = 11000; |
| 40 | const uint32_t RULE_PRIORITY_SECURE_VPN = 12000; |
| 41 | const uint32_t RULE_PRIORITY_EXPLICIT_NETWORK = 13000; |
| 42 | const uint32_t RULE_PRIORITY_OUTPUT_INTERFACE = 14000; |
| 43 | const uint32_t RULE_PRIORITY_LEGACY_SYSTEM = 15000; |
| 44 | const uint32_t RULE_PRIORITY_LEGACY_NETWORK = 16000; |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 45 | const uint32_t RULE_PRIORITY_LOCAL_NETWORK = 17000; |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 46 | const uint32_t RULE_PRIORITY_TETHERING = 18000; |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 47 | const 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; |
| 50 | const uint32_t RULE_PRIORITY_DEFAULT_NETWORK = 22000; |
| 51 | const uint32_t RULE_PRIORITY_DIRECTLY_CONNECTED = 23000; |
| 52 | const uint32_t RULE_PRIORITY_UNREACHABLE = 24000; |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 53 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 54 | const uint32_t ROUTE_TABLE_LOCAL_NETWORK = 97; |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 55 | const uint32_t ROUTE_TABLE_LEGACY_NETWORK = 98; |
| 56 | const uint32_t ROUTE_TABLE_LEGACY_SYSTEM = 99; |
| 57 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 58 | const char* const ROUTE_TABLE_NAME_LOCAL_NETWORK = "local_network"; |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 59 | const char* const ROUTE_TABLE_NAME_LEGACY_NETWORK = "legacy_network"; |
| 60 | const char* const ROUTE_TABLE_NAME_LEGACY_SYSTEM = "legacy_system"; |
| 61 | |
Sreeram Ramachandran | bb40d51 | 2014-07-11 11:45:14 -0700 | [diff] [blame] | 62 | const char* const ROUTE_TABLE_NAME_LOCAL = "local"; |
| 63 | const char* const ROUTE_TABLE_NAME_MAIN = "main"; |
| 64 | |
Lorenzo Colitti | 5965651 | 2014-06-25 03:20:29 +0900 | [diff] [blame] | 65 | // TODO: These values aren't defined by the Linux kernel, because our UID routing changes are not |
| 66 | // upstream (yet?), so we can't just pick them up from kernel headers. When (if?) the changes make |
| 67 | // it upstream, we'll remove this and rely on the kernel header values. For now, add a static assert |
| 68 | // that will warn us if upstream has given these values some other meaning. |
| 69 | const uint16_t FRA_UID_START = 18; |
| 70 | const uint16_t FRA_UID_END = 19; |
| 71 | static_assert(FRA_UID_START > FRA_MAX, |
| 72 | "Android-specific FRA_UID_{START,END} values also assigned in Linux uapi. " |
| 73 | "Check that these values match what the kernel does and then update this assertion."); |
| 74 | |
Lorenzo Colitti | 7272368 | 2014-06-26 13:51:10 +0900 | [diff] [blame] | 75 | const uint16_t NETLINK_REQUEST_FLAGS = NLM_F_REQUEST | NLM_F_ACK; |
| 76 | const uint16_t NETLINK_CREATE_REQUEST_FLAGS = NETLINK_REQUEST_FLAGS | NLM_F_CREATE | NLM_F_EXCL; |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 77 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 78 | const sockaddr_nl NETLINK_ADDRESS = {AF_NETLINK, 0, 0, 0}; |
| 79 | |
| 80 | const uint8_t AF_FAMILIES[] = {AF_INET, AF_INET6}; |
| 81 | |
| 82 | const char* const IP_VERSIONS[] = {"-4", "-6"}; |
| 83 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 84 | const uid_t UID_ROOT = 0; |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 85 | const char* const IIF_NONE = NULL; |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 86 | const char* const OIF_NONE = NULL; |
| 87 | const bool ACTION_ADD = true; |
| 88 | const bool ACTION_DEL = false; |
| 89 | const bool MODIFY_NON_UID_BASED_RULES = true; |
| 90 | |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 91 | const char* const RT_TABLES_PATH = "/data/misc/net/rt_tables"; |
Sreeram Ramachandran | c7d804c | 2014-07-09 07:39:30 -0700 | [diff] [blame] | 92 | const int RT_TABLES_FLAGS = O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW | O_CLOEXEC; |
| 93 | const mode_t RT_TABLES_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r-- |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 94 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 95 | // Avoids "non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned short'" |
| 96 | // warnings when using RTA_LENGTH(x) inside static initializers (even when x is already uint16_t). |
| 97 | constexpr uint16_t U16_RTA_LENGTH(uint16_t x) { |
| 98 | return RTA_LENGTH(x); |
| 99 | } |
| 100 | |
| 101 | // These are practically const, but can't be declared so, because they are used to initialize |
| 102 | // non-const pointers ("void* iov_base") in iovec arrays. |
| 103 | rtattr FRATTR_PRIORITY = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY }; |
| 104 | rtattr FRATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_TABLE }; |
| 105 | rtattr FRATTR_FWMARK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMARK }; |
| 106 | rtattr FRATTR_FWMASK = { U16_RTA_LENGTH(sizeof(uint32_t)), FRA_FWMASK }; |
| 107 | rtattr FRATTR_UID_START = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_START }; |
| 108 | rtattr FRATTR_UID_END = { U16_RTA_LENGTH(sizeof(uid_t)), FRA_UID_END }; |
| 109 | |
| 110 | rtattr RTATTR_TABLE = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_TABLE }; |
| 111 | rtattr RTATTR_OIF = { U16_RTA_LENGTH(sizeof(uint32_t)), RTA_OIF }; |
| 112 | |
| 113 | uint8_t PADDING_BUFFER[RTA_ALIGNTO] = {0, 0, 0, 0}; |
| 114 | |
| 115 | // END CONSTANTS ---------------------------------------------------------------------------------- |
| 116 | |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 117 | // No locks needed because RouteController is accessed only from one thread (in CommandListener). |
| 118 | std::map<std::string, uint32_t> interfaceToTable; |
Paul Jensen | a561e12 | 2014-06-12 16:46:37 -0400 | [diff] [blame] | 119 | |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 120 | uint32_t getRouteTableForInterface(const char* interface) { |
Sreeram Ramachandran | a481180 | 2014-04-10 12:10:24 -0700 | [diff] [blame] | 121 | uint32_t index = if_nametoindex(interface); |
Paul Jensen | a561e12 | 2014-06-12 16:46:37 -0400 | [diff] [blame] | 122 | if (index) { |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 123 | index += RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX; |
| 124 | interfaceToTable[interface] = index; |
| 125 | return index; |
Paul Jensen | a561e12 | 2014-06-12 16:46:37 -0400 | [diff] [blame] | 126 | } |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 127 | // If the interface goes away if_nametoindex() will return 0 but we still need to know |
| 128 | // the index so we can remove the rules and routes. |
| 129 | auto iter = interfaceToTable.find(interface); |
| 130 | if (iter == interfaceToTable.end()) { |
| 131 | ALOGE("cannot find interface %s", interface); |
| 132 | return RT_TABLE_UNSPEC; |
| 133 | } |
| 134 | return iter->second; |
| 135 | } |
| 136 | |
| 137 | void addTableName(uint32_t table, const std::string& name, std::string* contents) { |
| 138 | char tableString[UINT32_STRLEN]; |
| 139 | snprintf(tableString, sizeof(tableString), "%u", table); |
| 140 | *contents += tableString; |
| 141 | *contents += " "; |
| 142 | *contents += name; |
| 143 | *contents += "\n"; |
| 144 | } |
| 145 | |
| 146 | // Doesn't return success/failure as the file is optional; it's okay if we fail to update it. |
| 147 | void updateTableNamesFile() { |
| 148 | std::string contents; |
Sreeram Ramachandran | bb40d51 | 2014-07-11 11:45:14 -0700 | [diff] [blame] | 149 | |
| 150 | addTableName(RT_TABLE_LOCAL, ROUTE_TABLE_NAME_LOCAL, &contents); |
| 151 | addTableName(RT_TABLE_MAIN, ROUTE_TABLE_NAME_MAIN, &contents); |
| 152 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 153 | addTableName(ROUTE_TABLE_LOCAL_NETWORK, ROUTE_TABLE_NAME_LOCAL_NETWORK, &contents); |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 154 | addTableName(ROUTE_TABLE_LEGACY_NETWORK, ROUTE_TABLE_NAME_LEGACY_NETWORK, &contents); |
| 155 | addTableName(ROUTE_TABLE_LEGACY_SYSTEM, ROUTE_TABLE_NAME_LEGACY_SYSTEM, &contents); |
Sreeram Ramachandran | bb40d51 | 2014-07-11 11:45:14 -0700 | [diff] [blame] | 156 | |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 157 | for (const auto& entry : interfaceToTable) { |
| 158 | addTableName(entry.second, entry.first, &contents); |
| 159 | } |
| 160 | |
Sreeram Ramachandran | c7d804c | 2014-07-09 07:39:30 -0700 | [diff] [blame] | 161 | int fd = open(RT_TABLES_PATH, RT_TABLES_FLAGS, RT_TABLES_MODE); |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 162 | if (fd == -1) { |
| 163 | ALOGE("failed to create %s (%s)", RT_TABLES_PATH, strerror(errno)); |
| 164 | return; |
| 165 | } |
| 166 | // File creation is affected by umask, so make sure the right mode bits are set. |
Sreeram Ramachandran | c7d804c | 2014-07-09 07:39:30 -0700 | [diff] [blame] | 167 | if (fchmod(fd, RT_TABLES_MODE) == -1) { |
| 168 | ALOGE("failed to set mode 0%o on %s (%s)", RT_TABLES_MODE, RT_TABLES_PATH, strerror(errno)); |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 169 | } |
| 170 | ssize_t bytesWritten = write(fd, contents.data(), contents.size()); |
| 171 | if (bytesWritten != static_cast<ssize_t>(contents.size())) { |
| 172 | ALOGE("failed to write to %s (%zd vs %zu bytes) (%s)", RT_TABLES_PATH, bytesWritten, |
| 173 | contents.size(), strerror(errno)); |
| 174 | } |
| 175 | close(fd); |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 178 | // Sends a netlink request and expects an ack. |
| 179 | // |iov| is an array of struct iovec that contains the netlink message payload. |
| 180 | // The netlink header is generated by this function based on |action| and |flags|. |
| 181 | // Returns -errno if there was an error or if the kernel reported an error. |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 182 | WARN_UNUSED_RESULT int sendNetlinkRequest(uint16_t action, uint16_t flags, iovec* iov, int iovlen) { |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 183 | nlmsghdr nlmsg = { |
| 184 | .nlmsg_type = action, |
| 185 | .nlmsg_flags = flags, |
| 186 | }; |
| 187 | iov[0].iov_base = &nlmsg; |
| 188 | iov[0].iov_len = sizeof(nlmsg); |
| 189 | for (int i = 0; i < iovlen; ++i) { |
| 190 | nlmsg.nlmsg_len += iov[i].iov_len; |
| 191 | } |
| 192 | |
| 193 | int ret; |
| 194 | struct { |
| 195 | nlmsghdr msg; |
| 196 | nlmsgerr err; |
| 197 | } response; |
| 198 | |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 199 | int sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE); |
| 200 | if (sock != -1 && |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 201 | connect(sock, reinterpret_cast<const sockaddr*>(&NETLINK_ADDRESS), |
| 202 | sizeof(NETLINK_ADDRESS)) != -1 && |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 203 | writev(sock, iov, iovlen) != -1 && |
| 204 | (ret = recv(sock, &response, sizeof(response), 0)) != -1) { |
| 205 | if (ret == sizeof(response)) { |
| 206 | ret = response.err.error; // Netlink errors are negative errno. |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 207 | if (ret) { |
| 208 | ALOGE("netlink response contains error (%s)", strerror(-ret)); |
| 209 | } |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 210 | } else { |
Sreeram Ramachandran | 1201e84 | 2014-07-01 15:06:05 -0700 | [diff] [blame] | 211 | ALOGE("bad netlink response message size (%d != %zu)", ret, sizeof(response)); |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 212 | ret = -EBADMSG; |
| 213 | } |
| 214 | } else { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 215 | ALOGE("netlink socket/connect/writev/recv failed (%s)", strerror(errno)); |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 216 | ret = -errno; |
| 217 | } |
| 218 | |
| 219 | if (sock != -1) { |
| 220 | close(sock); |
| 221 | } |
| 222 | |
| 223 | return ret; |
| 224 | } |
| 225 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 226 | // Returns 0 on success or negative errno on failure. |
| 227 | int padInterfaceName(const char* input, char* name, size_t* length, uint16_t* padding) { |
| 228 | if (!input) { |
| 229 | *length = 0; |
| 230 | *padding = 0; |
| 231 | return 0; |
| 232 | } |
| 233 | *length = strlcpy(name, input, IFNAMSIZ) + 1; |
| 234 | if (*length > IFNAMSIZ) { |
| 235 | ALOGE("interface name too long (%zu > %u)", *length, IFNAMSIZ); |
| 236 | return -ENAMETOOLONG; |
| 237 | } |
| 238 | *padding = RTA_SPACE(*length) - RTA_LENGTH(*length); |
| 239 | return 0; |
| 240 | } |
| 241 | |
Sreeram Ramachandran | 8fe9c8e | 2014-04-16 12:08:05 -0700 | [diff] [blame] | 242 | // Adds or removes a routing rule for IPv4 and IPv6. |
| 243 | // |
| 244 | // + If |table| is non-zero, the rule points at the specified routing table. Otherwise, the rule |
| 245 | // returns ENETUNREACH. |
| 246 | // + If |mask| is non-zero, the rule matches the specified fwmark and mask. Otherwise, |fwmark| is |
| 247 | // ignored. |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 248 | // + If |iif| is non-NULL, the rule matches the specified incoming interface. |
| 249 | // + If |oif| is non-NULL, the rule matches the specified outgoing interface. |
| 250 | // + If |uidStart| and |uidEnd| are not INVALID_UID, the rule matches packets from UIDs in that |
| 251 | // range (inclusive). Otherwise, the rule matches packets from all UIDs. |
Lorenzo Colitti | 96f261e | 2014-06-23 15:09:54 +0900 | [diff] [blame] | 252 | // |
| 253 | // Returns 0 on success or negative errno on failure. |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 254 | WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 255 | uint32_t fwmark, uint32_t mask, const char* iif, |
| 256 | const char* oif, uid_t uidStart, uid_t uidEnd) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 257 | // Ensure that if you set a bit in the fwmark, it's not being ignored by the mask. |
| 258 | if (fwmark & ~mask) { |
| 259 | ALOGE("mask 0x%x does not select all the bits set in fwmark 0x%x", mask, fwmark); |
| 260 | return -ERANGE; |
| 261 | } |
| 262 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 263 | // Interface names must include exactly one terminating NULL and be properly padded, or older |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 264 | // kernels will refuse to delete rules. |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 265 | char iifName[IFNAMSIZ], oifName[IFNAMSIZ]; |
| 266 | size_t iifLength, oifLength; |
| 267 | uint16_t iifPadding, oifPadding; |
| 268 | if (int ret = padInterfaceName(iif, iifName, &iifLength, &iifPadding)) { |
| 269 | return ret; |
| 270 | } |
| 271 | if (int ret = padInterfaceName(oif, oifName, &oifLength, &oifPadding)) { |
| 272 | return ret; |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 273 | } |
| 274 | |
Lorenzo Colitti | 5965651 | 2014-06-25 03:20:29 +0900 | [diff] [blame] | 275 | // Either both start and end UID must be specified, or neither. |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 276 | if ((uidStart == INVALID_UID) != (uidEnd == INVALID_UID)) { |
Sreeram Ramachandran | cf89138 | 2014-07-01 15:49:20 -0700 | [diff] [blame] | 277 | ALOGE("incompatible start and end UIDs (%u vs %u)", uidStart, uidEnd); |
Lorenzo Colitti | 5965651 | 2014-06-25 03:20:29 +0900 | [diff] [blame] | 278 | return -EUSERS; |
| 279 | } |
Lorenzo Colitti | 7272368 | 2014-06-26 13:51:10 +0900 | [diff] [blame] | 280 | bool isUidRule = (uidStart != INVALID_UID); |
Lorenzo Colitti | 5965651 | 2014-06-25 03:20:29 +0900 | [diff] [blame] | 281 | |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 282 | // Assemble a rule request and put it in an array of iovec structures. |
| 283 | fib_rule_hdr rule = { |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 284 | .action = static_cast<uint8_t>(table != RT_TABLE_UNSPEC ? FR_ACT_TO_TBL : |
| 285 | FR_ACT_UNREACHABLE), |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 286 | }; |
| 287 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 288 | rtattr fraIifName = { U16_RTA_LENGTH(iifLength), FRA_IIFNAME }; |
| 289 | rtattr fraOifName = { U16_RTA_LENGTH(oifLength), FRA_OIFNAME }; |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 290 | |
| 291 | iovec iov[] = { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 292 | { NULL, 0 }, |
| 293 | { &rule, sizeof(rule) }, |
| 294 | { &FRATTR_PRIORITY, sizeof(FRATTR_PRIORITY) }, |
| 295 | { &priority, sizeof(priority) }, |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 296 | { &FRATTR_TABLE, table != RT_TABLE_UNSPEC ? sizeof(FRATTR_TABLE) : 0 }, |
| 297 | { &table, table != RT_TABLE_UNSPEC ? sizeof(table) : 0 }, |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 298 | { &FRATTR_FWMARK, mask ? sizeof(FRATTR_FWMARK) : 0 }, |
| 299 | { &fwmark, mask ? sizeof(fwmark) : 0 }, |
| 300 | { &FRATTR_FWMASK, mask ? sizeof(FRATTR_FWMASK) : 0 }, |
| 301 | { &mask, mask ? sizeof(mask) : 0 }, |
| 302 | { &FRATTR_UID_START, isUidRule ? sizeof(FRATTR_UID_START) : 0 }, |
| 303 | { &uidStart, isUidRule ? sizeof(uidStart) : 0 }, |
| 304 | { &FRATTR_UID_END, isUidRule ? sizeof(FRATTR_UID_END) : 0 }, |
| 305 | { &uidEnd, isUidRule ? sizeof(uidEnd) : 0 }, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 306 | { &fraIifName, iif != IIF_NONE ? sizeof(fraIifName) : 0 }, |
| 307 | { iifName, iifLength }, |
| 308 | { PADDING_BUFFER, iifPadding }, |
| 309 | { &fraOifName, oif != OIF_NONE ? sizeof(fraOifName) : 0 }, |
| 310 | { oifName, oifLength }, |
| 311 | { PADDING_BUFFER, oifPadding }, |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 312 | }; |
| 313 | |
Lorenzo Colitti | 7272368 | 2014-06-26 13:51:10 +0900 | [diff] [blame] | 314 | uint16_t flags = (action == RTM_NEWRULE) ? NETLINK_CREATE_REQUEST_FLAGS : NETLINK_REQUEST_FLAGS; |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 315 | for (size_t i = 0; i < ARRAY_SIZE(AF_FAMILIES); ++i) { |
| 316 | rule.family = AF_FAMILIES[i]; |
| 317 | if (int ret = sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov))) { |
Lorenzo Colitti | 96f261e | 2014-06-23 15:09:54 +0900 | [diff] [blame] | 318 | return ret; |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 319 | } |
| 320 | } |
| 321 | |
Lorenzo Colitti | 96f261e | 2014-06-23 15:09:54 +0900 | [diff] [blame] | 322 | return 0; |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 323 | } |
| 324 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 325 | WARN_UNUSED_RESULT int modifyIpRule(uint16_t action, uint32_t priority, uint32_t table, |
| 326 | uint32_t fwmark, uint32_t mask) { |
| 327 | return modifyIpRule(action, priority, table, fwmark, mask, IIF_NONE, OIF_NONE, INVALID_UID, |
| 328 | INVALID_UID); |
| 329 | } |
| 330 | |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 331 | // Adds or deletes an IPv4 or IPv6 route. |
| 332 | // Returns 0 on success or negative errno on failure. |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 333 | WARN_UNUSED_RESULT int modifyIpRoute(uint16_t action, uint32_t table, const char* interface, |
| 334 | const char* destination, const char* nexthop) { |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 335 | // At least the destination must be non-null. |
| 336 | if (!destination) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 337 | ALOGE("null destination"); |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 338 | return -EFAULT; |
| 339 | } |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 340 | |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 341 | // Parse the prefix. |
| 342 | uint8_t rawAddress[sizeof(in6_addr)]; |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 343 | uint8_t family; |
| 344 | uint8_t prefixLength; |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 345 | int rawLength = parsePrefix(destination, &family, rawAddress, sizeof(rawAddress), |
| 346 | &prefixLength); |
| 347 | if (rawLength < 0) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 348 | ALOGE("parsePrefix failed for destination %s (%s)", destination, strerror(-rawLength)); |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 349 | return rawLength; |
| 350 | } |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 351 | |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 352 | if (static_cast<size_t>(rawLength) > sizeof(rawAddress)) { |
Sreeram Ramachandran | 1201e84 | 2014-07-01 15:06:05 -0700 | [diff] [blame] | 353 | ALOGE("impossible! address too long (%d vs %zu)", rawLength, sizeof(rawAddress)); |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 354 | return -ENOBUFS; // Cannot happen; parsePrefix only supports IPv4 and IPv6. |
| 355 | } |
| 356 | |
| 357 | // If an interface was specified, find the ifindex. |
| 358 | uint32_t ifindex; |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 359 | if (interface != OIF_NONE) { |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 360 | ifindex = if_nametoindex(interface); |
| 361 | if (!ifindex) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 362 | ALOGE("cannot find interface %s", interface); |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 363 | return -ENODEV; |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 364 | } |
| 365 | } |
| 366 | |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 367 | // If a nexthop was specified, parse it as the same family as the prefix. |
| 368 | uint8_t rawNexthop[sizeof(in6_addr)]; |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 369 | if (nexthop && inet_pton(family, nexthop, rawNexthop) <= 0) { |
| 370 | ALOGE("inet_pton failed for nexthop %s", nexthop); |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 371 | return -EINVAL; |
| 372 | } |
| 373 | |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 374 | // Assemble a rtmsg and put it in an array of iovec structures. |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 375 | rtmsg route = { |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 376 | .rtm_protocol = RTPROT_STATIC, |
| 377 | .rtm_type = RTN_UNICAST, |
| 378 | .rtm_family = family, |
| 379 | .rtm_dst_len = prefixLength, |
| 380 | }; |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 381 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 382 | rtattr rtaDst = { U16_RTA_LENGTH(rawLength), RTA_DST }; |
| 383 | rtattr rtaGateway = { U16_RTA_LENGTH(rawLength), RTA_GATEWAY }; |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 384 | |
| 385 | iovec iov[] = { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 386 | { NULL, 0 }, |
| 387 | { &route, sizeof(route) }, |
| 388 | { &RTATTR_TABLE, sizeof(RTATTR_TABLE) }, |
| 389 | { &table, sizeof(table) }, |
| 390 | { &rtaDst, sizeof(rtaDst) }, |
| 391 | { rawAddress, static_cast<size_t>(rawLength) }, |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 392 | { &RTATTR_OIF, interface != OIF_NONE ? sizeof(RTATTR_OIF) : 0 }, |
| 393 | { &ifindex, interface != OIF_NONE ? sizeof(ifindex) : 0 }, |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 394 | { &rtaGateway, nexthop ? sizeof(rtaGateway) : 0 }, |
| 395 | { rawNexthop, nexthop ? static_cast<size_t>(rawLength) : 0 }, |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 396 | }; |
Lorenzo Colitti | ba25df9 | 2014-06-18 00:22:17 +0900 | [diff] [blame] | 397 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 398 | uint16_t flags = (action == RTM_NEWROUTE) ? NETLINK_CREATE_REQUEST_FLAGS : |
| 399 | NETLINK_REQUEST_FLAGS; |
Lorenzo Colitti | 4753afd | 2014-06-20 23:03:29 +0900 | [diff] [blame] | 400 | return sendNetlinkRequest(action, flags, iov, ARRAY_SIZE(iov)); |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 401 | } |
| 402 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 403 | // Add rules to allow legacy routes added through the requestRouteToHost() API. |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 404 | WARN_UNUSED_RESULT int addLegacyRouteRules() { |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 405 | Fwmark fwmark; |
| 406 | Fwmark mask; |
| 407 | |
| 408 | fwmark.explicitlySelected = false; |
| 409 | mask.explicitlySelected = true; |
| 410 | |
| 411 | // Rules to allow legacy routes to override the default network. |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 412 | if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 413 | fwmark.intValue, mask.intValue)) { |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 414 | return ret; |
| 415 | } |
| 416 | if (int ret = modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LEGACY_NETWORK, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 417 | ROUTE_TABLE_LEGACY_NETWORK, fwmark.intValue, mask.intValue)) { |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 418 | return ret; |
| 419 | } |
| 420 | |
| 421 | fwmark.permission = PERMISSION_SYSTEM; |
| 422 | mask.permission = PERMISSION_SYSTEM; |
| 423 | |
| 424 | // A rule to allow legacy routes from system apps to override VPNs. |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 425 | return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_VPN_OVERRIDE_SYSTEM, ROUTE_TABLE_LEGACY_SYSTEM, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 426 | fwmark.intValue, mask.intValue); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 427 | } |
| 428 | |
| 429 | // Add a new rule to look up the 'main' table, with the same selectors as the "default network" |
| 430 | // rule, but with a lower priority. Since the default network rule points to a table with a default |
| 431 | // route, the rule we're adding will never be used for normal routing lookups. However, the kernel |
| 432 | // may fall-through to it to find directly-connected routes when it validates that a nexthop (in a |
| 433 | // route being added) is reachable. |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 434 | WARN_UNUSED_RESULT int addDirectlyConnectedRule() { |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 435 | Fwmark fwmark; |
| 436 | Fwmark mask; |
| 437 | |
| 438 | fwmark.netId = NETID_UNSET; |
| 439 | mask.netId = FWMARK_NET_ID_MASK; |
| 440 | |
| 441 | return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_DIRECTLY_CONNECTED, RT_TABLE_MAIN, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 442 | fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, UID_ROOT, UID_ROOT); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | // Add a rule to preempt the pre-defined "from all lookup main" rule. Packets that reach this rule |
| 446 | // will be null-routed, and won't fall-through to the main table. |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 447 | WARN_UNUSED_RESULT int addUnreachableRule() { |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 448 | return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_UNREACHABLE, RT_TABLE_UNSPEC, MARK_UNSET, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 449 | MARK_UNSET); |
| 450 | } |
| 451 | |
| 452 | // A rule to lookup the local network before looking up the default network. |
| 453 | WARN_UNUSED_RESULT int addImplicitLocalNetworkRule() { |
| 454 | Fwmark fwmark; |
| 455 | Fwmark mask; |
| 456 | |
| 457 | fwmark.explicitlySelected = false; |
| 458 | mask.explicitlySelected = true; |
| 459 | |
| 460 | return modifyIpRule(RTM_NEWRULE, RULE_PRIORITY_LOCAL_NETWORK, ROUTE_TABLE_LOCAL_NETWORK, |
| 461 | fwmark.intValue, mask.intValue); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 462 | } |
| 463 | |
| 464 | // An iptables rule to mark incoming packets on a network with the netId of the network. |
| 465 | // |
| 466 | // This is so that the kernel can: |
| 467 | // + Use the right fwmark for (and thus correctly route) replies (e.g.: TCP RST, ICMP errors, ping |
| 468 | // replies, SYN-ACKs, etc). |
| 469 | // + Mark sockets that accept connections from this interface so that the connection stays on the |
| 470 | // same interface. |
| 471 | WARN_UNUSED_RESULT int modifyIncomingPacketMark(unsigned netId, const char* interface, |
| 472 | Permission permission, bool add) { |
| 473 | Fwmark fwmark; |
| 474 | |
| 475 | fwmark.netId = netId; |
| 476 | fwmark.explicitlySelected = true; |
| 477 | fwmark.protectedFromVpn = true; |
| 478 | fwmark.permission = permission; |
| 479 | |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 480 | char markString[UINT32_HEX_STRLEN]; |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 481 | snprintf(markString, sizeof(markString), "0x%x", fwmark.intValue); |
| 482 | |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 483 | if (execIptables(V4V6, "-t", "mangle", add ? "-A" : "-D", "INPUT", "-i", interface, "-j", |
| 484 | "MARK", "--set-mark", markString, NULL)) { |
| 485 | ALOGE("failed to change iptables rule that sets incoming packet mark"); |
| 486 | return -EREMOTEIO; |
| 487 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 488 | |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 489 | return 0; |
| 490 | } |
| 491 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 492 | // A rule to route traffic based on an explicitly chosen network. |
| 493 | // |
| 494 | // Supports apps that use the multinetwork APIs to restrict their traffic to a network. |
| 495 | // |
| 496 | // Even though we check permissions at the time we set a netId into the fwmark of a socket, we need |
| 497 | // to check it again in the rules here, because a network's permissions may have been updated via |
| 498 | // modifyNetworkPermission(). |
| 499 | WARN_UNUSED_RESULT int modifyExplicitNetworkRule(unsigned netId, uint32_t table, |
| 500 | Permission permission, uid_t uidStart, |
| 501 | uid_t uidEnd, bool add) { |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 502 | Fwmark fwmark; |
| 503 | Fwmark mask; |
| 504 | |
| 505 | fwmark.netId = netId; |
| 506 | mask.netId = FWMARK_NET_ID_MASK; |
| 507 | |
Sreeram Ramachandran | 122f581 | 2014-05-11 20:29:49 -0700 | [diff] [blame] | 508 | fwmark.explicitlySelected = true; |
| 509 | mask.explicitlySelected = true; |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 510 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 511 | fwmark.permission = permission; |
| 512 | mask.permission = permission; |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 513 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 514 | return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_EXPLICIT_NETWORK, table, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 515 | fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 516 | } |
| 517 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 518 | // A rule to route traffic based on a chosen outgoing interface. |
| 519 | // |
| 520 | // Supports apps that use SO_BINDTODEVICE or IP_PKTINFO options and the kernel that already knows |
| 521 | // the outgoing interface (typically for link-local communications). |
| 522 | WARN_UNUSED_RESULT int modifyOutputInterfaceRule(const char* interface, uint32_t table, |
| 523 | Permission permission, uid_t uidStart, |
| 524 | uid_t uidEnd, bool add) { |
| 525 | Fwmark fwmark; |
| 526 | Fwmark mask; |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 527 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 528 | fwmark.permission = permission; |
| 529 | mask.permission = permission; |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 530 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 531 | return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_OUTPUT_INTERFACE, table, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 532 | fwmark.intValue, mask.intValue, IIF_NONE, interface, uidStart, uidEnd); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 533 | } |
| 534 | |
| 535 | // A rule to route traffic based on the chosen network. |
| 536 | // |
| 537 | // This is for sockets that have not explicitly requested a particular network, but have been |
| 538 | // bound to one when they called connect(). This ensures that sockets connected on a particular |
| 539 | // network stay on that network even if the default network changes. |
| 540 | WARN_UNUSED_RESULT int modifyImplicitNetworkRule(unsigned netId, uint32_t table, |
| 541 | Permission permission, bool add) { |
| 542 | Fwmark fwmark; |
| 543 | Fwmark mask; |
| 544 | |
| 545 | fwmark.netId = netId; |
| 546 | mask.netId = FWMARK_NET_ID_MASK; |
| 547 | |
| 548 | fwmark.explicitlySelected = false; |
| 549 | mask.explicitlySelected = true; |
| 550 | |
| 551 | fwmark.permission = permission; |
| 552 | mask.permission = permission; |
| 553 | |
| 554 | return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_IMPLICIT_NETWORK, table, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 555 | fwmark.intValue, mask.intValue); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 556 | } |
| 557 | |
| 558 | // A rule to route all traffic from a given set of UIDs to go over the VPN. |
| 559 | // |
| 560 | // Notice that this rule doesn't use the netId. I.e., no matter what netId the user's socket may |
| 561 | // have, if they are subject to this VPN, their traffic has to go through it. Allows the traffic to |
| 562 | // bypass the VPN if the protectedFromVpn bit is set. |
| 563 | WARN_UNUSED_RESULT int modifyVpnUidRangeRule(uint32_t table, uid_t uidStart, uid_t uidEnd, |
| 564 | bool add) { |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 565 | Fwmark fwmark; |
| 566 | Fwmark mask; |
| 567 | |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 568 | fwmark.protectedFromVpn = false; |
| 569 | mask.protectedFromVpn = true; |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 570 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 571 | return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_SECURE_VPN, table, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 572 | fwmark.intValue, mask.intValue, IIF_NONE, OIF_NONE, uidStart, uidEnd); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | // A rule to allow system apps to send traffic over this VPN even if they are not part of the target |
| 576 | // set of UIDs. |
| 577 | // |
| 578 | // This is needed for DnsProxyListener to correctly resolve a request for a user who is in the |
| 579 | // target set, but where the DnsProxyListener itself is not. |
| 580 | WARN_UNUSED_RESULT int modifyVpnSystemPermissionRule(unsigned netId, uint32_t table, bool add) { |
| 581 | Fwmark fwmark; |
| 582 | Fwmark mask; |
| 583 | |
| 584 | fwmark.netId = netId; |
| 585 | mask.netId = FWMARK_NET_ID_MASK; |
| 586 | |
| 587 | fwmark.permission = PERMISSION_SYSTEM; |
| 588 | mask.permission = PERMISSION_SYSTEM; |
| 589 | |
| 590 | return modifyIpRule(add ? RTM_NEWRULE : RTM_DELRULE, RULE_PRIORITY_SECURE_VPN, table, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 591 | fwmark.intValue, mask.intValue); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 592 | } |
| 593 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 594 | WARN_UNUSED_RESULT int modifyTetheringRule(uint16_t action, const char* inputInterface, |
| 595 | const char* outputInterface) { |
| 596 | uint32_t table = getRouteTableForInterface(outputInterface); |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 597 | if (table == RT_TABLE_UNSPEC) { |
| 598 | return -ESRCH; |
| 599 | } |
| 600 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 601 | return modifyIpRule(action, RULE_PRIORITY_TETHERING, table, MARK_UNSET, MARK_UNSET, |
| 602 | inputInterface, outputInterface, INVALID_UID, INVALID_UID); |
| 603 | } |
| 604 | |
| 605 | WARN_UNUSED_RESULT int modifyLocalNetwork(unsigned netId, const char* interface, bool add) { |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 606 | if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { |
| 607 | return ret; |
| 608 | } |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 609 | return modifyOutputInterfaceRule(interface, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, |
| 610 | INVALID_UID, INVALID_UID, add); |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 611 | } |
| 612 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 613 | WARN_UNUSED_RESULT int modifyPhysicalNetwork(unsigned netId, const char* interface, |
| 614 | Permission permission, bool add) { |
| 615 | uint32_t table = getRouteTableForInterface(interface); |
| 616 | if (table == RT_TABLE_UNSPEC) { |
| 617 | return -ESRCH; |
| 618 | } |
| 619 | |
| 620 | if (int ret = modifyIncomingPacketMark(netId, interface, permission, add)) { |
| 621 | return ret; |
| 622 | } |
| 623 | if (int ret = modifyExplicitNetworkRule(netId, table, permission, INVALID_UID, INVALID_UID, |
| 624 | add)) { |
| 625 | return ret; |
| 626 | } |
| 627 | if (int ret = modifyOutputInterfaceRule(interface, table, permission, INVALID_UID, INVALID_UID, |
| 628 | add)) { |
| 629 | return ret; |
| 630 | } |
| 631 | return modifyImplicitNetworkRule(netId, table, permission, add); |
| 632 | } |
| 633 | |
| 634 | WARN_UNUSED_RESULT int modifyVirtualNetwork(unsigned netId, const char* interface, |
| 635 | const UidRanges& uidRanges, bool add, |
| 636 | bool modifyNonUidBasedRules) { |
| 637 | uint32_t table = getRouteTableForInterface(interface); |
| 638 | if (table == RT_TABLE_UNSPEC) { |
| 639 | return -ESRCH; |
| 640 | } |
| 641 | |
Sreeram Ramachandran | e09b20a | 2014-07-05 17:15:14 -0700 | [diff] [blame] | 642 | for (const UidRanges::Range& range : uidRanges.getRanges()) { |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 643 | if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, range.first, |
| 644 | range.second, add)) { |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 645 | return ret; |
| 646 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 647 | if (int ret = modifyOutputInterfaceRule(interface, table, PERMISSION_NONE, range.first, |
| 648 | range.second, add)) { |
| 649 | return ret; |
| 650 | } |
| 651 | if (int ret = modifyVpnUidRangeRule(table, range.first, range.second, add)) { |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 652 | return ret; |
| 653 | } |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 654 | } |
| 655 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 656 | if (modifyNonUidBasedRules) { |
| 657 | if (int ret = modifyIncomingPacketMark(netId, interface, PERMISSION_NONE, add)) { |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 658 | return ret; |
| 659 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 660 | if (int ret = modifyExplicitNetworkRule(netId, table, PERMISSION_NONE, UID_ROOT, UID_ROOT, |
| 661 | add)) { |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 662 | return ret; |
| 663 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 664 | return modifyVpnSystemPermissionRule(netId, table, add); |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | return 0; |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 668 | } |
| 669 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 670 | WARN_UNUSED_RESULT int modifyDefaultNetwork(uint16_t action, const char* interface, |
| 671 | Permission permission) { |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 672 | uint32_t table = getRouteTableForInterface(interface); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 673 | if (table == RT_TABLE_UNSPEC) { |
Lorenzo Colitti | 96f261e | 2014-06-23 15:09:54 +0900 | [diff] [blame] | 674 | return -ESRCH; |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 675 | } |
| 676 | |
Sreeram Ramachandran | 122f581 | 2014-05-11 20:29:49 -0700 | [diff] [blame] | 677 | Fwmark fwmark; |
Sreeram Ramachandran | 122f581 | 2014-05-11 20:29:49 -0700 | [diff] [blame] | 678 | Fwmark mask; |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 679 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 680 | fwmark.netId = NETID_UNSET; |
Sreeram Ramachandran | 122f581 | 2014-05-11 20:29:49 -0700 | [diff] [blame] | 681 | mask.netId = FWMARK_NET_ID_MASK; |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 682 | |
| 683 | fwmark.permission = permission; |
Sreeram Ramachandran | 122f581 | 2014-05-11 20:29:49 -0700 | [diff] [blame] | 684 | mask.permission = permission; |
| 685 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 686 | return modifyIpRule(action, RULE_PRIORITY_DEFAULT_NETWORK, table, fwmark.intValue, |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 687 | mask.intValue); |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 688 | } |
| 689 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 690 | // Adds or removes an IPv4 or IPv6 route to the specified table and, if it's a directly-connected |
Lorenzo Colitti | f7fc8ec | 2014-06-18 00:41:58 +0900 | [diff] [blame] | 691 | // route, to the main table as well. |
| 692 | // Returns 0 on success or negative errno on failure. |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 693 | WARN_UNUSED_RESULT int modifyRoute(uint16_t action, const char* interface, const char* destination, |
| 694 | const char* nexthop, RouteController::TableType tableType) { |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 695 | uint32_t table; |
Sreeram Ramachandran | 38b7af1 | 2014-05-22 14:21:49 -0700 | [diff] [blame] | 696 | switch (tableType) { |
| 697 | case RouteController::INTERFACE: { |
| 698 | table = getRouteTableForInterface(interface); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 699 | if (table == RT_TABLE_UNSPEC) { |
| 700 | return -ESRCH; |
| 701 | } |
Sreeram Ramachandran | 38b7af1 | 2014-05-22 14:21:49 -0700 | [diff] [blame] | 702 | break; |
| 703 | } |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 704 | case RouteController::LOCAL_NETWORK: { |
| 705 | table = ROUTE_TABLE_LOCAL_NETWORK; |
| 706 | break; |
| 707 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 708 | case RouteController::LEGACY_NETWORK: { |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 709 | table = ROUTE_TABLE_LEGACY_NETWORK; |
Sreeram Ramachandran | 38b7af1 | 2014-05-22 14:21:49 -0700 | [diff] [blame] | 710 | break; |
| 711 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 712 | case RouteController::LEGACY_SYSTEM: { |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 713 | table = ROUTE_TABLE_LEGACY_SYSTEM; |
Sreeram Ramachandran | 38b7af1 | 2014-05-22 14:21:49 -0700 | [diff] [blame] | 714 | break; |
| 715 | } |
| 716 | } |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 717 | |
Lorenzo Colitti | f7fc8ec | 2014-06-18 00:41:58 +0900 | [diff] [blame] | 718 | int ret = modifyIpRoute(action, table, interface, destination, nexthop); |
Sreeram Ramachandran | 1077d29 | 2014-06-27 06:42:11 -0700 | [diff] [blame] | 719 | // We allow apps to call requestRouteToHost() multiple times with the same route, so ignore |
| 720 | // EEXIST failures when adding routes to legacy tables. |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 721 | if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST && |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 722 | (tableType == RouteController::LEGACY_NETWORK || |
| 723 | tableType == RouteController::LEGACY_SYSTEM))) { |
Lorenzo Colitti | f7fc8ec | 2014-06-18 00:41:58 +0900 | [diff] [blame] | 724 | return ret; |
Sreeram Ramachandran | c921337 | 2014-04-16 12:32:18 -0700 | [diff] [blame] | 725 | } |
| 726 | |
| 727 | // If there's no nexthop, this is a directly connected route. Add it to the main table also, to |
Lorenzo Colitti | f7fc8ec | 2014-06-18 00:41:58 +0900 | [diff] [blame] | 728 | // let the kernel find it when validating nexthops when global routes are added. |
| 729 | if (!nexthop) { |
| 730 | ret = modifyIpRoute(action, RT_TABLE_MAIN, interface, destination, NULL); |
| 731 | // A failure with action == ADD && errno == EEXIST means that the route already exists in |
| 732 | // the main table, perhaps because the kernel added it automatically as part of adding the |
| 733 | // IP address to the interface. Ignore this, but complain about everything else. |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 734 | if (ret && !(action == RTM_NEWROUTE && ret == -EEXIST)) { |
Lorenzo Colitti | f7fc8ec | 2014-06-18 00:41:58 +0900 | [diff] [blame] | 735 | return ret; |
| 736 | } |
Sreeram Ramachandran | c921337 | 2014-04-16 12:32:18 -0700 | [diff] [blame] | 737 | } |
| 738 | |
Lorenzo Colitti | f7fc8ec | 2014-06-18 00:41:58 +0900 | [diff] [blame] | 739 | return 0; |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 740 | } |
| 741 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 742 | // Returns 0 on success or negative errno on failure. |
| 743 | WARN_UNUSED_RESULT int flushRoutes(const char* interface) { |
Sreeram Ramachandran | 92b66c4 | 2014-04-15 14:28:55 -0700 | [diff] [blame] | 744 | uint32_t table = getRouteTableForInterface(interface); |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 745 | if (table == RT_TABLE_UNSPEC) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 746 | return -ESRCH; |
Sreeram Ramachandran | 92b66c4 | 2014-04-15 14:28:55 -0700 | [diff] [blame] | 747 | } |
| 748 | |
Lorenzo Colitti | 357e562 | 2014-06-17 16:14:17 +0900 | [diff] [blame] | 749 | char tableString[UINT32_STRLEN]; |
| 750 | snprintf(tableString, sizeof(tableString), "%u", table); |
| 751 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 752 | for (size_t i = 0; i < ARRAY_SIZE(IP_VERSIONS); ++i) { |
Lorenzo Colitti | 357e562 | 2014-06-17 16:14:17 +0900 | [diff] [blame] | 753 | const char* argv[] = { |
| 754 | IP_PATH, |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 755 | IP_VERSIONS[i], |
Sreeram Ramachandran | 72999d6 | 2014-07-02 18:06:34 -0700 | [diff] [blame] | 756 | "route", |
Lorenzo Colitti | 357e562 | 2014-06-17 16:14:17 +0900 | [diff] [blame] | 757 | "flush", |
| 758 | "table", |
| 759 | tableString, |
| 760 | }; |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 761 | if (android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL, false, false)) { |
| 762 | ALOGE("failed to flush routes"); |
| 763 | return -EREMOTEIO; |
Lorenzo Colitti | 357e562 | 2014-06-17 16:14:17 +0900 | [diff] [blame] | 764 | } |
| 765 | } |
| 766 | |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 767 | interfaceToTable.erase(interface); |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 768 | return 0; |
Sreeram Ramachandran | 92b66c4 | 2014-04-15 14:28:55 -0700 | [diff] [blame] | 769 | } |
| 770 | |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 771 | } // namespace |
| 772 | |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 773 | int RouteController::Init(unsigned localNetId) { |
| 774 | if (int ret = addDirectlyConnectedRule()) { |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 775 | return ret; |
| 776 | } |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 777 | if (int ret = addLegacyRouteRules()) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 778 | return ret; |
| 779 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 780 | // TODO: Enable once we are sure everything works. |
| 781 | if (false) { |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 782 | if (int ret = addUnreachableRule()) { |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 783 | return ret; |
| 784 | } |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 785 | } |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 786 | if (int ret = addImplicitLocalNetworkRule()) { |
| 787 | return ret; |
| 788 | } |
| 789 | // Add a rule to lookup the local network it has been explicitly selected. |
| 790 | if (int ret = modifyExplicitNetworkRule(localNetId, ROUTE_TABLE_LOCAL_NETWORK, PERMISSION_NONE, |
| 791 | INVALID_UID, INVALID_UID, ACTION_ADD)) { |
| 792 | return ret; |
| 793 | } |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 794 | updateTableNamesFile(); |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 795 | return 0; |
Sreeram Ramachandran | 8fe9c8e | 2014-04-16 12:08:05 -0700 | [diff] [blame] | 796 | } |
| 797 | |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 798 | int RouteController::addInterfaceToLocalNetwork(unsigned netId, const char* interface) { |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 799 | return modifyLocalNetwork(netId, interface, ACTION_ADD); |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 800 | } |
| 801 | |
| 802 | int RouteController::removeInterfaceFromLocalNetwork(unsigned netId, const char* interface) { |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 803 | return modifyLocalNetwork(netId, interface, ACTION_DEL); |
Sreeram Ramachandran | 6a77353 | 2014-07-11 09:10:20 -0700 | [diff] [blame] | 804 | } |
| 805 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 806 | int RouteController::addInterfaceToPhysicalNetwork(unsigned netId, const char* interface, |
| 807 | Permission permission) { |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 808 | if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_ADD)) { |
| 809 | return ret; |
| 810 | } |
| 811 | updateTableNamesFile(); |
| 812 | return 0; |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 813 | } |
| 814 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 815 | int RouteController::removeInterfaceFromPhysicalNetwork(unsigned netId, const char* interface, |
| 816 | Permission permission) { |
| 817 | if (int ret = modifyPhysicalNetwork(netId, interface, permission, ACTION_DEL)) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 818 | return ret; |
| 819 | } |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 820 | if (int ret = flushRoutes(interface)) { |
| 821 | return ret; |
| 822 | } |
| 823 | updateTableNamesFile(); |
| 824 | return 0; |
Sreeram Ramachandran | 379bd33 | 2014-04-10 19:58:06 -0700 | [diff] [blame] | 825 | } |
| 826 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 827 | int RouteController::addInterfaceToVirtualNetwork(unsigned netId, const char* interface, |
| 828 | const UidRanges& uidRanges) { |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 829 | if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, ACTION_ADD, |
| 830 | MODIFY_NON_UID_BASED_RULES)) { |
| 831 | return ret; |
| 832 | } |
| 833 | updateTableNamesFile(); |
| 834 | return 0; |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 835 | } |
| 836 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 837 | int RouteController::removeInterfaceFromVirtualNetwork(unsigned netId, const char* interface, |
| 838 | const UidRanges& uidRanges) { |
| 839 | if (int ret = modifyVirtualNetwork(netId, interface, uidRanges, ACTION_DEL, |
| 840 | MODIFY_NON_UID_BASED_RULES)) { |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 841 | return ret; |
| 842 | } |
Sreeram Ramachandran | 4acd34a | 2014-07-07 22:11:37 -0700 | [diff] [blame] | 843 | if (int ret = flushRoutes(interface)) { |
| 844 | return ret; |
| 845 | } |
| 846 | updateTableNamesFile(); |
| 847 | return 0; |
Sreeram Ramachandran | 4043f01 | 2014-06-23 12:41:37 -0700 | [diff] [blame] | 848 | } |
| 849 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 850 | int RouteController::modifyPhysicalNetworkPermission(unsigned netId, const char* interface, |
| 851 | Permission oldPermission, |
| 852 | Permission newPermission) { |
Sreeram Ramachandran | 379bd33 | 2014-04-10 19:58:06 -0700 | [diff] [blame] | 853 | // Add the new rules before deleting the old ones, to avoid race conditions. |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 854 | if (int ret = modifyPhysicalNetwork(netId, interface, newPermission, ACTION_ADD)) { |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 855 | return ret; |
| 856 | } |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 857 | return modifyPhysicalNetwork(netId, interface, oldPermission, ACTION_DEL); |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 858 | } |
| 859 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 860 | int RouteController::addUsersToVirtualNetwork(unsigned netId, const char* interface, |
| 861 | const UidRanges& uidRanges) { |
| 862 | return modifyVirtualNetwork(netId, interface, uidRanges, ACTION_ADD, |
| 863 | !MODIFY_NON_UID_BASED_RULES); |
Sreeram Ramachandran | b1425cc | 2014-06-23 18:54:27 -0700 | [diff] [blame] | 864 | } |
| 865 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 866 | int RouteController::removeUsersFromVirtualNetwork(unsigned netId, const char* interface, |
| 867 | const UidRanges& uidRanges) { |
| 868 | return modifyVirtualNetwork(netId, interface, uidRanges, ACTION_DEL, |
| 869 | !MODIFY_NON_UID_BASED_RULES); |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 870 | } |
| 871 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 872 | int RouteController::addInterfaceToDefaultNetwork(const char* interface, Permission permission) { |
| 873 | return modifyDefaultNetwork(RTM_NEWRULE, interface, permission); |
Sreeram Ramachandran | 9c0d313 | 2014-04-10 20:35:04 -0700 | [diff] [blame] | 874 | } |
| 875 | |
Sreeram Ramachandran | 5009d5e | 2014-07-03 12:20:48 -0700 | [diff] [blame] | 876 | int RouteController::removeInterfaceFromDefaultNetwork(const char* interface, |
| 877 | Permission permission) { |
| 878 | return modifyDefaultNetwork(RTM_DELRULE, interface, permission); |
Sreeram Ramachandran | 5c181bf | 2014-04-07 14:10:04 -0700 | [diff] [blame] | 879 | } |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 880 | |
Sreeram Ramachandran | f4f6c8d | 2014-06-23 09:54:06 -0700 | [diff] [blame] | 881 | int RouteController::addRoute(const char* interface, const char* destination, const char* nexthop, |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 882 | TableType tableType) { |
| 883 | return modifyRoute(RTM_NEWROUTE, interface, destination, nexthop, tableType); |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 884 | } |
| 885 | |
Lorenzo Colitti | f7fc8ec | 2014-06-18 00:41:58 +0900 | [diff] [blame] | 886 | int RouteController::removeRoute(const char* interface, const char* destination, |
Sreeram Ramachandran | eb27b7e | 2014-07-01 14:30:30 -0700 | [diff] [blame] | 887 | const char* nexthop, TableType tableType) { |
| 888 | return modifyRoute(RTM_DELROUTE, interface, destination, nexthop, tableType); |
Sreeram Ramachandran | 7619e1b | 2014-04-15 14:23:08 -0700 | [diff] [blame] | 889 | } |
Sreeram Ramachandran | 87475a1 | 2014-07-15 16:20:28 -0700 | [diff] [blame^] | 890 | |
| 891 | int RouteController::enableTethering(const char* inputInterface, const char* outputInterface) { |
| 892 | return modifyTetheringRule(RTM_NEWRULE, inputInterface, outputInterface); |
| 893 | } |
| 894 | |
| 895 | int RouteController::disableTethering(const char* inputInterface, const char* outputInterface) { |
| 896 | return modifyTetheringRule(RTM_DELRULE, inputInterface, outputInterface); |
| 897 | } |