blob: e55114f4c73ccc4956b45d61b376115c926b196f [file] [log] [blame]
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -07001/*
2 * Copyright (C) 2012 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 *
Sasha Levitskiy329c3b42012-07-30 16:11:23 -07008 * http://www.apache.org/licenses/LICENSE-2.0
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -07009 *
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 <stdlib.h>
18#include <errno.h>
19#include <fcntl.h>
20#include <string.h>
Lorenzo Colitti37f2e372013-04-12 00:44:06 +090021#include <dirent.h>
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -070022
Sasha Levitskiy329c3b42012-07-30 16:11:23 -070023#include <dlfcn.h>
24
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -070025#include <sys/socket.h>
26#include <sys/stat.h>
27#include <sys/ioctl.h>
28#include <sys/types.h>
29
30#include <netinet/in.h>
31#include <arpa/inet.h>
32
33#define LOG_TAG "InterfaceController"
34#include <cutils/log.h>
35#include <netutils/ifc.h>
36#include <private/android_filesystem_config.h>
37
Lorenzo Colitti70afde62013-03-04 17:58:40 +090038#include "NetdConstants.h"
39
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -070040#include "InterfaceController.h"
Sreeram Ramachandrana4811802014-04-10 12:10:24 -070041#include "RouteController.h"
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -070042
Sasha Levitskiy17609ed2014-04-21 11:03:56 -070043char if_cmd_lib_file_name[] = "libnetcmdiface.so";
Sasha Levitskiy329c3b42012-07-30 16:11:23 -070044char set_cmd_func_name[] = "net_iface_send_command";
45char set_cmd_init_func_name[] = "net_iface_send_command_init";
46char set_cmd_fini_func_name[] = "net_iface_send_command_fini";
47
Lorenzo Colitti37f2e372013-04-12 00:44:06 +090048const char ipv6_proc_path[] = "/proc/sys/net/ipv6/conf";
49
Dmitry Shmidt6d6c0e62013-06-11 16:18:06 -070050const char sys_net_path[] = "/sys/class/net";
51
Sasha Levitskiy329c3b42012-07-30 16:11:23 -070052InterfaceController::InterfaceController()
53 : sendCommand_(NULL) {
Lorenzo Colitti37f2e372013-04-12 00:44:06 +090054 // Initial IPv6 settings.
55 // By default, accept_ra is set to 1 (accept RAs unless forwarding is on) on all interfaces.
56 // This causes RAs to work or not work based on whether forwarding is on, and causes routes
57 // learned from RAs to go away when forwarding is turned on. Make this behaviour predictable
58 // by always setting accept_ra to 2.
59 setAcceptRA("2");
60
Sasha Levitskiy329c3b42012-07-30 16:11:23 -070061 libh_ = dlopen(if_cmd_lib_file_name, RTLD_NOW | RTLD_LOCAL);
62 if (libh_ == NULL) {
63 const char *err_str = dlerror();
Sasha Levitskiy87482aa2012-09-11 11:04:29 -070064 ALOGW("Warning (%s) while opening the net interface command library", err_str ? err_str : "unknown");
Sasha Levitskiy329c3b42012-07-30 16:11:23 -070065 } else {
66 sendCommandInit_ = (int (*)(void))dlsym(libh_, set_cmd_init_func_name);
67 if (sendCommandInit_ == NULL) {
68 const char *err_str = dlerror();
69 ALOGW("Error (%s) while searching for the interface command init function", err_str ? err_str : "unknown");
70 } else if (sendCommandInit_()) {
71 ALOGE("Can't init the interface command API");
72 return;
73 }
74 sendCommandFini_ = (int (*)(void))dlsym(libh_, set_cmd_fini_func_name);
75 if (sendCommandFini_ == NULL) {
76 const char *err_str = dlerror();
77 ALOGW("Error (%s) while searching for the interface command fini function", err_str ? err_str : "unknown");
78 }
79 sendCommand_ = (int (*)(int, char **, char **))dlsym(libh_, set_cmd_func_name);
80 if (sendCommand_ == NULL) {
81 const char *err_str = dlerror();
82 ALOGE("Error (%s) while searching for the interface command function", err_str ? err_str : "unknown");
83 return;
84 }
85 }
Sreeram Ramachandrana4811802014-04-10 12:10:24 -070086
87 setAcceptRARouteTable(-RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX);
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -070088}
89
90InterfaceController::~InterfaceController() {
Sasha Levitskiy329c3b42012-07-30 16:11:23 -070091 if (sendCommandFini_) {
92 if (sendCommandFini_()) {
93 ALOGE("Can't shutdown the interface command API");
94 }
95 }
96 if (libh_) {
97 int err = dlclose(libh_);
98 if (err) {
99 const char *err_str = dlerror();
100 ALOGE("Error (%s) while closing the net interface command library", err_str ? err_str : "unknown");
101 }
102 }
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -0700103}
104
105/*
106 * Arguments:
Sasha Levitskiy329c3b42012-07-30 16:11:23 -0700107 * argv[2] - wlan interface
108 * argv[3] - command
109 * argv[4] - argument
110 * rbuf - returned buffer
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -0700111 */
112int InterfaceController::interfaceCommand(int argc, char *argv[], char **rbuf) {
Sasha Levitskiy329c3b42012-07-30 16:11:23 -0700113 int ret = -ENOSYS;
114 if (sendCommand_)
115 ret = sendCommand_(argc, argv, rbuf);
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -0700116
Sasha Levitskiy329c3b42012-07-30 16:11:23 -0700117 return ret;
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -0700118}
Lorenzo Colitti70afde62013-03-04 17:58:40 +0900119
120int InterfaceController::writeIPv6ProcPath(const char *interface, const char *setting, const char *value) {
121 char *path;
Lorenzo Colitti37f2e372013-04-12 00:44:06 +0900122 asprintf(&path, "%s/%s/%s", ipv6_proc_path, interface, setting);
Lorenzo Colitti70afde62013-03-04 17:58:40 +0900123 int success = writeFile(path, value, strlen(value));
124 free(path);
125 return success;
126}
127
128int InterfaceController::setEnableIPv6(const char *interface, const int on) {
129 // When disable_ipv6 changes from 1 to 0, the kernel starts autoconf.
130 // When disable_ipv6 changes from 0 to 1, the kernel clears all autoconf
131 // addresses and routes and disables IPv6 on the interface.
132 const char *disable_ipv6 = on ? "0" : "1";
133 return writeIPv6ProcPath(interface, "disable_ipv6", disable_ipv6);
134}
135
136int InterfaceController::setIPv6PrivacyExtensions(const char *interface, const int on) {
137 // 0: disable IPv6 privacy addresses
138 // 0: enable IPv6 privacy addresses and prefer them over non-privacy ones.
139 return writeIPv6ProcPath(interface, "use_tempaddr", on ? "2" : "0");
140}
Lorenzo Colitti37f2e372013-04-12 00:44:06 +0900141
142int InterfaceController::isInterfaceName(const char *name) {
143 return strcmp(name, ".") &&
144 strcmp(name, "..") &&
145 strcmp(name, "default") &&
146 strcmp(name, "all");
147}
148
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700149void InterfaceController::setOnAllInterfaces(const char* filename, const char* value) {
Lorenzo Colitti37f2e372013-04-12 00:44:06 +0900150 // Set the default value, which is used by any interfaces that are created in the future.
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700151 writeIPv6ProcPath("default", filename, value);
Lorenzo Colitti37f2e372013-04-12 00:44:06 +0900152
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700153 // Set the value on all the interfaces that currently exist.
154 DIR* dir = opendir(ipv6_proc_path);
Lorenzo Colitti37f2e372013-04-12 00:44:06 +0900155 if (!dir) {
156 ALOGE("Can't list %s: %s", ipv6_proc_path, strerror(errno));
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700157 return;
Lorenzo Colitti37f2e372013-04-12 00:44:06 +0900158 }
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700159 dirent* d;
160 while ((d = readdir(dir))) {
Lorenzo Colitti37f2e372013-04-12 00:44:06 +0900161 if (d->d_type == DT_DIR && isInterfaceName(d->d_name)) {
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700162 writeIPv6ProcPath(d->d_name, filename, value);
Lorenzo Colitti37f2e372013-04-12 00:44:06 +0900163 }
164 }
165 closedir(dir);
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700166}
167
168void InterfaceController::setAcceptRA(const char *value) {
169 setOnAllInterfaces("accept_ra", value);
170}
171
Sreeram Ramachandrana01d6ef2014-04-10 19:37:59 -0700172// |tableOrOffset| is interpreted as:
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700173// If == 0: default. Routes go into RT6_TABLE_MAIN.
174// If > 0: user set. Routes go into the specified table.
175// If < 0: automatic. The absolute value is intepreted as an offset and added to the interface
176// ID to get the table. If it's set to -1000, routes from interface ID 5 will go into
177// table 1005, etc.
Sreeram Ramachandrana01d6ef2014-04-10 19:37:59 -0700178void InterfaceController::setAcceptRARouteTable(int tableOrOffset) {
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700179 char* value;
Sreeram Ramachandrana01d6ef2014-04-10 19:37:59 -0700180 asprintf(&value, "%d", tableOrOffset);
Sreeram Ramachandrana4811802014-04-10 12:10:24 -0700181 setOnAllInterfaces("accept_ra_rt_table", value);
182 free(value);
Lorenzo Colitti37f2e372013-04-12 00:44:06 +0900183}
Dmitry Shmidt6d6c0e62013-06-11 16:18:06 -0700184
185int InterfaceController::getMtu(const char *interface, int *mtu)
186{
187 char buf[16];
188 int size = sizeof(buf);
189 char *path;
190 asprintf(&path, "%s/%s/mtu", sys_net_path, interface);
191 int success = readFile(path, buf, &size);
192 if (!success && mtu)
193 *mtu = atoi(buf);
194 free(path);
195 return success;
196
197}
198
199int InterfaceController::setMtu(const char *interface, const char *mtu)
200{
201 char *path;
202 asprintf(&path, "%s/%s/mtu", sys_net_path, interface);
203 int success = writeFile(path, mtu, strlen(mtu));
204 free(path);
205 return success;
206}