1 files changed, 123 insertions, 0 deletions
diff --git a/server/InterfaceController.cpp b/server/InterfaceController.cpp
new file mode 100644
index 00000000..061060f8
--- /dev/null
+++ b/server/InterfaceController.cpp
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *	  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <dirent.h>
+
+#define LOG_TAG "InterfaceController"
+#include <cutils/log.h>
+
+#include "InterfaceController.h"
+#include "RouteController.h"
+
+const char ipv6_proc_path[] = "/proc/sys/net/ipv6/conf";
+
+const char sys_net_path[] = "/sys/class/net";
+
+InterfaceController::InterfaceController() {
+	// Initial IPv6 settings.
+	// By default, accept_ra is set to 1 (accept RAs unless forwarding is on) on all interfaces.
+	// This causes RAs to work or not work based on whether forwarding is on, and causes routes
+	// learned from RAs to go away when forwarding is turned on. Make this behaviour predictable
+	// by always setting accept_ra to 2.
+	setAcceptRA("2");
+
+	setAcceptRARouteTable(-RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX);
+}
+
+InterfaceController::~InterfaceController() {
+}
+
+int InterfaceController::writeIPv6ProcPath(const char *interface, const char *setting, const char *value) {
+	char *path;
+	if (!isIfaceName(interface)) {
+		errno = ENOENT;
+		return -1;
+	}
+	asprintf(&path, "%s/%s/%s", ipv6_proc_path, interface, setting);
+	int success = writeFile(path, value, strlen(value));
+	free(path);
+	return success;
+}
+
+int InterfaceController::setEnableIPv6(const char *interface, const int on) {
+	// When disable_ipv6 changes from 1 to 0, the kernel starts autoconf.
+	// When disable_ipv6 changes from 0 to 1, the kernel clears all autoconf
+	// addresses and routes and disables IPv6 on the interface.
+	const char *disable_ipv6 = on ? "0" : "1";
+	return writeIPv6ProcPath(interface, "disable_ipv6", disable_ipv6);
+}
+
+int InterfaceController::setIPv6PrivacyExtensions(const char *interface, const int on) {
+	// 0: disable IPv6 privacy addresses
+	// 0: enable IPv6 privacy addresses and prefer them over non-privacy ones.
+	return writeIPv6ProcPath(interface, "use_tempaddr", on ? "2" : "0");
+}
+
+int InterfaceController::isInterfaceName(const char *name) {
+	return strcmp(name, ".") &&
+		strcmp(name, "..") &&
+		strcmp(name, "default") &&
+		strcmp(name, "all");
+}
+
+void InterfaceController::setOnAllInterfaces(const char* filename, const char* value) {
+	// Set the default value, which is used by any interfaces that are created in the future.
+	writeIPv6ProcPath("default", filename, value);
+
+	// Set the value on all the interfaces that currently exist.
+	DIR* dir = opendir(ipv6_proc_path);
+	if (!dir) {
+		ALOGE("Can't list %s: %s", ipv6_proc_path, strerror(errno));
+		return;
+	}
+	dirent* d;
+	while ((d = readdir(dir))) {
+		if (d->d_type == DT_DIR && isInterfaceName(d->d_name)) {
+			writeIPv6ProcPath(d->d_name, filename, value);
+		}
+	}
+	closedir(dir);
+}
+
+void InterfaceController::setAcceptRA(const char *value) {
+	setOnAllInterfaces("accept_ra", value);
+}
+
+// |tableOrOffset| is interpreted as:
+//     If == 0: default. Routes go into RT6_TABLE_MAIN.
+//     If > 0: user set. Routes go into the specified table.
+//     If < 0: automatic. The absolute value is intepreted as an offset and added to the interface
+//             ID to get the table. If it's set to -1000, routes from interface ID 5 will go into
+//             table 1005, etc.
+void InterfaceController::setAcceptRARouteTable(int tableOrOffset) {
+	char* value;
+	asprintf(&value, "%d", tableOrOffset);
+	setOnAllInterfaces("accept_ra_rt_table", value);
+	free(value);
+}
+
+int InterfaceController::setMtu(const char *interface, const char *mtu)
+{
+	char *path;
+	if (!isIfaceName(interface)) {
+		errno = ENOENT;
+		return -1;
+	}
+	asprintf(&path, "%s/%s/mtu", sys_net_path, interface);
+	int success = writeFile(path, mtu, strlen(mtu));
+	free(path);
+	return success;
+}