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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"
41
Sasha Levitskiy329c3b42012-07-30 16:11:23 -070042char if_cmd_lib_file_name[] = "/system/lib/libnetcmdiface.so";
43char set_cmd_func_name[] = "net_iface_send_command";
44char set_cmd_init_func_name[] = "net_iface_send_command_init";
45char set_cmd_fini_func_name[] = "net_iface_send_command_fini";
46
Lorenzo Colitti37f2e372013-04-12 00:44:06 +090047const char ipv6_proc_path[] = "/proc/sys/net/ipv6/conf";
48
Sasha Levitskiy329c3b42012-07-30 16:11:23 -070049InterfaceController::InterfaceController()
50 : sendCommand_(NULL) {
Lorenzo Colitti37f2e372013-04-12 00:44:06 +090051 // Initial IPv6 settings.
52 // By default, accept_ra is set to 1 (accept RAs unless forwarding is on) on all interfaces.
53 // This causes RAs to work or not work based on whether forwarding is on, and causes routes
54 // learned from RAs to go away when forwarding is turned on. Make this behaviour predictable
55 // by always setting accept_ra to 2.
56 setAcceptRA("2");
57
Sasha Levitskiy329c3b42012-07-30 16:11:23 -070058 libh_ = dlopen(if_cmd_lib_file_name, RTLD_NOW | RTLD_LOCAL);
59 if (libh_ == NULL) {
60 const char *err_str = dlerror();
Sasha Levitskiy87482aa2012-09-11 11:04:29 -070061 ALOGW("Warning (%s) while opening the net interface command library", err_str ? err_str : "unknown");
Sasha Levitskiy329c3b42012-07-30 16:11:23 -070062 } else {
63 sendCommandInit_ = (int (*)(void))dlsym(libh_, set_cmd_init_func_name);
64 if (sendCommandInit_ == NULL) {
65 const char *err_str = dlerror();
66 ALOGW("Error (%s) while searching for the interface command init function", err_str ? err_str : "unknown");
67 } else if (sendCommandInit_()) {
68 ALOGE("Can't init the interface command API");
69 return;
70 }
71 sendCommandFini_ = (int (*)(void))dlsym(libh_, set_cmd_fini_func_name);
72 if (sendCommandFini_ == NULL) {
73 const char *err_str = dlerror();
74 ALOGW("Error (%s) while searching for the interface command fini function", err_str ? err_str : "unknown");
75 }
76 sendCommand_ = (int (*)(int, char **, char **))dlsym(libh_, set_cmd_func_name);
77 if (sendCommand_ == NULL) {
78 const char *err_str = dlerror();
79 ALOGE("Error (%s) while searching for the interface command function", err_str ? err_str : "unknown");
80 return;
81 }
82 }
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -070083}
84
85InterfaceController::~InterfaceController() {
Sasha Levitskiy329c3b42012-07-30 16:11:23 -070086 if (sendCommandFini_) {
87 if (sendCommandFini_()) {
88 ALOGE("Can't shutdown the interface command API");
89 }
90 }
91 if (libh_) {
92 int err = dlclose(libh_);
93 if (err) {
94 const char *err_str = dlerror();
95 ALOGE("Error (%s) while closing the net interface command library", err_str ? err_str : "unknown");
96 }
97 }
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -070098}
99
100/*
101 * Arguments:
Sasha Levitskiy329c3b42012-07-30 16:11:23 -0700102 * argv[2] - wlan interface
103 * argv[3] - command
104 * argv[4] - argument
105 * rbuf - returned buffer
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -0700106 */
107int InterfaceController::interfaceCommand(int argc, char *argv[], char **rbuf) {
Sasha Levitskiy329c3b42012-07-30 16:11:23 -0700108 int ret = -ENOSYS;
109 if (sendCommand_)
110 ret = sendCommand_(argc, argv, rbuf);
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -0700111
Sasha Levitskiy329c3b42012-07-30 16:11:23 -0700112 return ret;
Dmitry Shmidt2eab1f72012-07-26 16:08:02 -0700113}
Lorenzo Colitti70afde62013-03-04 17:58:40 +0900114
115int InterfaceController::writeIPv6ProcPath(const char *interface, const char *setting, const char *value) {
116 char *path;
Lorenzo Colitti37f2e372013-04-12 00:44:06 +0900117 asprintf(&path, "%s/%s/%s", ipv6_proc_path, interface, setting);
Lorenzo Colitti70afde62013-03-04 17:58:40 +0900118 int success = writeFile(path, value, strlen(value));
119 free(path);
120 return success;
121}
122
123int InterfaceController::setEnableIPv6(const char *interface, const int on) {
124 // When disable_ipv6 changes from 1 to 0, the kernel starts autoconf.
125 // When disable_ipv6 changes from 0 to 1, the kernel clears all autoconf
126 // addresses and routes and disables IPv6 on the interface.
127 const char *disable_ipv6 = on ? "0" : "1";
128 return writeIPv6ProcPath(interface, "disable_ipv6", disable_ipv6);
129}
130
131int InterfaceController::setIPv6PrivacyExtensions(const char *interface, const int on) {
132 // 0: disable IPv6 privacy addresses
133 // 0: enable IPv6 privacy addresses and prefer them over non-privacy ones.
134 return writeIPv6ProcPath(interface, "use_tempaddr", on ? "2" : "0");
135}
Lorenzo Colitti37f2e372013-04-12 00:44:06 +0900136
137int InterfaceController::isInterfaceName(const char *name) {
138 return strcmp(name, ".") &&
139 strcmp(name, "..") &&
140 strcmp(name, "default") &&
141 strcmp(name, "all");
142}
143
144int InterfaceController::setAcceptRA(const char *value) {
145 // Set the default value, which is used by any interfaces that are created in the future.
146 writeIPv6ProcPath("default", "accept_ra", value);
147
148 // Set the value on all the interfaces.
149 DIR *dir = opendir(ipv6_proc_path);
150 if (!dir) {
151 ALOGE("Can't list %s: %s", ipv6_proc_path, strerror(errno));
152 return -errno;
153 }
154 struct dirent *d;
155 while((d = readdir(dir)) != NULL) {
156 if (d->d_type == DT_DIR && isInterfaceName(d->d_name)) {
157 if (writeIPv6ProcPath(d->d_name, "accept_ra", value) < 0) {
158 ALOGE("Can't write to %s/%s/accept_ra: %s", ipv6_proc_path,
159 d->d_name, strerror(errno));
160 }
161 }
162 }
163 closedir(dir);
164 return 0;
165}