2 * Copyright (C) 2008 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.
22 #include <sys/socket.h>
24 #include <sys/types.h>
27 #include <netinet/in.h>
28 #include <arpa/inet.h>
30 #define LOG_TAG "SecondaryTablController"
31 #include <cutils/log.h>
32 #include <cutils/properties.h>
34 #include "ResponseCode.h"
35 #include "SecondaryTableController.h"
37 static char IP_PATH[] = "/system/bin/ip";
38 static char ADD[] = "add";
39 static char DEL[] = "del";
41 SecondaryTableController::SecondaryTableController() {
43 for (i=0; i < INTERFACES_TRACKED; i++) {
44 mInterfaceTable[i][0] = 0;
45 // TODO - use a hashtable or other prebuilt container class
46 mInterfaceRuleCount[i] = 0;
50 SecondaryTableController::~SecondaryTableController() {
53 int SecondaryTableController::findTableNumber(const char *iface) {
55 for (i = 0; i < INTERFACES_TRACKED; i++) {
56 if (strncmp(iface, mInterfaceTable[i], MAX_IFACE_LENGTH) == 0) {
63 int SecondaryTableController::addRoute(SocketClient *cli, char *iface, char *dest, int prefix,
65 int tableIndex = findTableNumber(iface);
66 if (tableIndex == -1) {
67 tableIndex = findTableNumber(""); // look for an empty slot
68 if (tableIndex == -1) {
69 LOGE("Max number of NATed interfaces reached");
71 cli->sendMsg(ResponseCode::OperationFailed, "Max number NATed", true);
74 strncpy(mInterfaceTable[tableIndex], iface, MAX_IFACE_LENGTH);
77 return modifyRoute(cli, ADD, iface, dest, prefix, gateway, tableIndex);
80 int SecondaryTableController::modifyRoute(SocketClient *cli, char *action, char *iface, char *dest,
81 int prefix, char *gateway, int tableIndex) {
84 if (strcmp("::", gateway) == 0) {
85 // IP tool doesn't like "::" - the equiv of 0.0.0.0 that it accepts for ipv4
86 asprintf(&cmd, "%s route %s %s/%d dev %s table %d",
87 IP_PATH, action, dest, prefix, iface, tableIndex+BASE_TABLE_NUMBER);
89 asprintf(&cmd, "%s route %s %s/%d via %s dev %s table %d",
90 IP_PATH, action, dest, prefix, gateway, iface, tableIndex+BASE_TABLE_NUMBER);
93 if (runAndFree(cli, cmd)) {
94 LOGE("ip route %s failed: %s route %s %s/%d via %s dev %s table %d", action,
95 IP_PATH, action, dest, prefix, gateway, iface, tableIndex+BASE_TABLE_NUMBER);
97 cli->sendMsg(ResponseCode::OperationFailed, "ip route modification failed", true);
101 if (strcmp(action, ADD) == 0) {
102 mInterfaceRuleCount[tableIndex]++;
104 if (--mInterfaceRuleCount[tableIndex] < 1) {
105 mInterfaceRuleCount[tableIndex] = 0;
106 mInterfaceTable[tableIndex][0] = 0;
109 cli->sendMsg(ResponseCode::CommandOkay, "Route modified", false);
113 int SecondaryTableController::removeRoute(SocketClient *cli, char *iface, char *dest, int prefix,
115 int tableIndex = findTableNumber(iface);
116 if (tableIndex == -1) {
117 LOGE("Interface not found");
119 cli->sendMsg(ResponseCode::OperationFailed, "Interface not found", true);
123 return modifyRoute(cli, DEL, iface, dest, prefix, gateway, tableIndex);
126 int SecondaryTableController::runAndFree(SocketClient *cli, char *cmd) {
128 if (strlen(cmd) >= 255) {
129 LOGE("ip command (%s) too long", cmd);
131 cli->sendMsg(ResponseCode::CommandSyntaxError, "Too long", true);