Kamil Trzcinski
parent
66b988298d
commit
24d5ac2426
1 changed files with 0 additions and 187 deletions
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/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <dirent.h>
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#include <errno.h>
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#include <malloc.h>
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#define LOG_TAG "InterfaceController"
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#include <android-base/file.h>
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#include <android-base/stringprintf.h>
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#include <cutils/log.h>
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#include <logwrap/logwrap.h>
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#include "InterfaceController.h"
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#include "RouteController.h"
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using android::base::StringPrintf;
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using android::base::WriteStringToFile;
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namespace {
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const char ipv6_proc_path[] = "/proc/sys/net/ipv6/conf";
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const char ipv4_neigh_conf_dir[] = "/proc/sys/net/ipv4/neigh";
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const char ipv6_neigh_conf_dir[] = "/proc/sys/net/ipv6/neigh";
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const char sys_net_path[] = "/sys/class/net";
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const char wl_util_path[] = "/vendor/xbin/wlutil";
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bool isInterfaceName(const char *name) {
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return strcmp(name, ".") &&
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strcmp(name, "..") &&
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strcmp(name, "default") &&
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strcmp(name, "all");
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}
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int writeValueToPath(
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const char* dirname, const char* subdirname, const char* basename,
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const char* value) {
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std::string path(StringPrintf("%s/%s/%s", dirname, subdirname, basename));
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return WriteStringToFile(value, path) ? 0 : -1;
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}
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void setOnAllInterfaces(const char* dirname, const char* basename, const char* value) {
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// Set the default value, which is used by any interfaces that are created in the future.
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writeValueToPath(dirname, "default", basename, value);
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// Set the value on all the interfaces that currently exist.
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DIR* dir = opendir(dirname);
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if (!dir) {
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ALOGE("Can't list %s: %s", dirname, strerror(errno));
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return;
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}
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dirent* d;
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while ((d = readdir(dir))) {
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if ((d->d_type != DT_DIR) || !isInterfaceName(d->d_name)) {
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continue;
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}
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writeValueToPath(dirname, d->d_name, basename, value);
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}
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closedir(dir);
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}
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void setIPv6UseOutgoingInterfaceAddrsOnly(const char *value) {
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setOnAllInterfaces(ipv6_proc_path, "use_oif_addrs_only", value);
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}
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} // namespace
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InterfaceController::InterfaceController() {
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// Initial IPv6 settings.
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// By default, accept_ra is set to 1 (accept RAs unless forwarding is on) on all interfaces.
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// This causes RAs to work or not work based on whether forwarding is on, and causes routes
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// learned from RAs to go away when forwarding is turned on. Make this behaviour predictable
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// by always setting accept_ra to 2.
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setAcceptRA("2");
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setAcceptRARouteTable(-RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX);
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// Enable optimistic DAD for IPv6 addresses on all interfaces.
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setIPv6OptimisticMode("1");
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// Reduce the ARP/ND base reachable time from the default (30sec) to 15sec.
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setBaseReachableTimeMs(15 * 1000);
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// When sending traffic via a given interface use only addresses configured
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// on that interface as possible source addresses.
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setIPv6UseOutgoingInterfaceAddrsOnly("1");
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}
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InterfaceController::~InterfaceController() {
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}
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int InterfaceController::setEnableIPv6(const char *interface, const int on) {
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if (!isIfaceName(interface)) {
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errno = ENOENT;
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return -1;
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}
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// When disable_ipv6 changes from 1 to 0, the kernel starts autoconf.
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// When disable_ipv6 changes from 0 to 1, the kernel clears all autoconf
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// addresses and routes and disables IPv6 on the interface.
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const char *disable_ipv6 = on ? "1" : "1";
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return writeValueToPath(ipv6_proc_path, interface, "disable_ipv6", disable_ipv6);
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}
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int InterfaceController::setIPv6PrivacyExtensions(const char *interface, const int on) {
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if (!isIfaceName(interface)) {
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errno = ENOENT;
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return -1;
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}
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// 0: disable IPv6 privacy addresses
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// 0: enable IPv6 privacy addresses and prefer them over non-privacy ones.
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return writeValueToPath(ipv6_proc_path, interface, "use_tempaddr", on ? "2" : "0");
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}
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// Enables or disables IPv6 ND offload. This is useful for 464xlat on wifi, IPv6 tethering, and
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// generally implementing IPv6 neighbour discovery and duplicate address detection properly.
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// TODO: This should be implemented in wpa_supplicant via driver commands instead.
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int InterfaceController::setIPv6NdOffload(char* interface, const int on) {
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// Only supported on Broadcom chipsets via wlutil for now.
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if (access(wl_util_path, X_OK) == 0) {
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const char *argv[] = {
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wl_util_path,
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"-a",
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interface,
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"ndoe",
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on ? "1" : "0"
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};
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int ret = android_fork_execvp(ARRAY_SIZE(argv), const_cast<char**>(argv), NULL,
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false, false);
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ALOGD("%s ND offload on %s: %d (%s)",
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(on ? "enabling" : "disabling"), interface, ret, strerror(errno));
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return ret;
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} else {
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return 0;
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}
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}
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void InterfaceController::setAcceptRA(const char *value) {
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setOnAllInterfaces(ipv6_proc_path, "accept_ra", value);
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}
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// |tableOrOffset| is interpreted as:
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// If == 0: default. Routes go into RT6_TABLE_MAIN.
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// If > 0: user set. Routes go into the specified table.
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// If < 0: automatic. The absolute value is intepreted as an offset and added to the interface
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// ID to get the table. If it's set to -1000, routes from interface ID 5 will go into
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// table 1005, etc.
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void InterfaceController::setAcceptRARouteTable(int tableOrOffset) {
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std::string value(StringPrintf("%d", tableOrOffset));
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setOnAllInterfaces(ipv6_proc_path, "accept_ra_rt_table", value.c_str());
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}
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int InterfaceController::setMtu(const char *interface, const char *mtu)
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{
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if (!isIfaceName(interface)) {
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errno = ENOENT;
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return -1;
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}
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return writeValueToPath(sys_net_path, interface, "mtu", mtu);
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}
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void InterfaceController::setBaseReachableTimeMs(unsigned int millis) {
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std::string value(StringPrintf("%u", millis));
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setOnAllInterfaces(ipv4_neigh_conf_dir, "base_reachable_time_ms", value.c_str());
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setOnAllInterfaces(ipv6_neigh_conf_dir, "base_reachable_time_ms", value.c_str());
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}
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void InterfaceController::setIPv6OptimisticMode(const char *value) {
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setOnAllInterfaces(ipv6_proc_path, "optimistic_dad", value);
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setOnAllInterfaces(ipv6_proc_path, "use_optimistic", value);
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}
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