2 * Copyright (C) 2012 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
19 #define LOG_TAG "InterfaceController"
20 #include <cutils/log.h>
22 #include "InterfaceController.h"
23 #include "RouteController.h"
25 const char ipv6_proc_path[] = "/proc/sys/net/ipv6/conf";
27 const char sys_net_path[] = "/sys/class/net";
29 InterfaceController::InterfaceController() {
30 // Initial IPv6 settings.
31 // By default, accept_ra is set to 1 (accept RAs unless forwarding is on) on all interfaces.
32 // This causes RAs to work or not work based on whether forwarding is on, and causes routes
33 // learned from RAs to go away when forwarding is turned on. Make this behaviour predictable
34 // by always setting accept_ra to 2.
37 setAcceptRARouteTable(-RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX);
40 InterfaceController::~InterfaceController() {
43 int InterfaceController::writeIPv6ProcPath(const char *interface, const char *setting, const char *value) {
45 if (!isIfaceName(interface)) {
49 asprintf(&path, "%s/%s/%s", ipv6_proc_path, interface, setting);
50 int success = writeFile(path, value, strlen(value));
55 int InterfaceController::setEnableIPv6(const char *interface, const int on) {
56 // When disable_ipv6 changes from 1 to 0, the kernel starts autoconf.
57 // When disable_ipv6 changes from 0 to 1, the kernel clears all autoconf
58 // addresses and routes and disables IPv6 on the interface.
59 const char *disable_ipv6 = on ? "0" : "1";
60 return writeIPv6ProcPath(interface, "disable_ipv6", disable_ipv6);
63 int InterfaceController::setIPv6PrivacyExtensions(const char *interface, const int on) {
64 // 0: disable IPv6 privacy addresses
65 // 0: enable IPv6 privacy addresses and prefer them over non-privacy ones.
66 return writeIPv6ProcPath(interface, "use_tempaddr", on ? "2" : "0");
69 int InterfaceController::isInterfaceName(const char *name) {
70 return strcmp(name, ".") &&
72 strcmp(name, "default") &&
76 void InterfaceController::setOnAllInterfaces(const char* filename, const char* value) {
77 // Set the default value, which is used by any interfaces that are created in the future.
78 writeIPv6ProcPath("default", filename, value);
80 // Set the value on all the interfaces that currently exist.
81 DIR* dir = opendir(ipv6_proc_path);
83 ALOGE("Can't list %s: %s", ipv6_proc_path, strerror(errno));
87 while ((d = readdir(dir))) {
88 if (d->d_type == DT_DIR && isInterfaceName(d->d_name)) {
89 writeIPv6ProcPath(d->d_name, filename, value);
95 void InterfaceController::setAcceptRA(const char *value) {
96 setOnAllInterfaces("accept_ra", value);
99 // |tableOrOffset| is interpreted as:
100 // If == 0: default. Routes go into RT6_TABLE_MAIN.
101 // If > 0: user set. Routes go into the specified table.
102 // If < 0: automatic. The absolute value is intepreted as an offset and added to the interface
103 // ID to get the table. If it's set to -1000, routes from interface ID 5 will go into
105 void InterfaceController::setAcceptRARouteTable(int tableOrOffset) {
107 asprintf(&value, "%d", tableOrOffset);
108 setOnAllInterfaces("accept_ra_rt_table", value);
112 int InterfaceController::setMtu(const char *interface, const char *mtu)
115 if (!isIfaceName(interface)) {
119 asprintf(&path, "%s/%s/mtu", sys_net_path, interface);
120 int success = writeFile(path, mtu, strlen(mtu));