1/*
2 * Copyright (C) 2014 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 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
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 <set>
18#include "VirtualNetwork.h"
19
20#include "SockDiag.h"
21#include "RouteController.h"
22
23#define LOG_TAG "Netd"
24#include "log/log.h"
25
26namespace android {
27namespace net {
28
29VirtualNetwork::VirtualNetwork(unsigned netId, bool hasDns, bool secure) :
30        Network(netId), mHasDns(hasDns), mSecure(secure) {
31}
32
33VirtualNetwork::~VirtualNetwork() {
34}
35
36bool VirtualNetwork::getHasDns() const {
37    return mHasDns;
38}
39
40bool VirtualNetwork::isSecure() const {
41    return mSecure;
42}
43
44bool VirtualNetwork::appliesToUser(uid_t uid) const {
45    return mUidRanges.hasUid(uid);
46}
47
48
49int VirtualNetwork::maybeCloseSockets(bool add, const UidRanges& uidRanges,
50                                      const std::set<uid_t>& protectableUsers) {
51    if (!mSecure) {
52        return 0;
53    }
54
55    SockDiag sd;
56    if (!sd.open()) {
57        return -EBADFD;
58    }
59
60    if (int ret = sd.destroySockets(uidRanges, protectableUsers, true /* excludeLoopback */)) {
61        ALOGE("Failed to close sockets while %s %s to network %d: %s",
62              add ? "adding" : "removing", uidRanges.toString().c_str(), mNetId, strerror(-ret));
63        return ret;
64    }
65
66    return 0;
67}
68
69int VirtualNetwork::addUsers(const UidRanges& uidRanges, const std::set<uid_t>& protectableUsers) {
70    maybeCloseSockets(true, uidRanges, protectableUsers);
71
72    for (const std::string& interface : mInterfaces) {
73        if (int ret = RouteController::addUsersToVirtualNetwork(mNetId, interface.c_str(), mSecure,
74                                                                uidRanges)) {
75            ALOGE("failed to add users on interface %s of netId %u", interface.c_str(), mNetId);
76            return ret;
77        }
78    }
79    mUidRanges.add(uidRanges);
80    return 0;
81}
82
83int VirtualNetwork::removeUsers(const UidRanges& uidRanges,
84                                const std::set<uid_t>& protectableUsers) {
85    maybeCloseSockets(false, uidRanges, protectableUsers);
86
87    for (const std::string& interface : mInterfaces) {
88        if (int ret = RouteController::removeUsersFromVirtualNetwork(mNetId, interface.c_str(),
89                                                                     mSecure, uidRanges)) {
90            ALOGE("failed to remove users on interface %s of netId %u", interface.c_str(), mNetId);
91            return ret;
92        }
93    }
94    mUidRanges.remove(uidRanges);
95    return 0;
96}
97
98Network::Type VirtualNetwork::getType() const {
99    return VIRTUAL;
100}
101
102int VirtualNetwork::addInterface(const std::string& interface) {
103    if (hasInterface(interface)) {
104        return 0;
105    }
106    if (int ret = RouteController::addInterfaceToVirtualNetwork(mNetId, interface.c_str(), mSecure,
107                                                                mUidRanges)) {
108        ALOGE("failed to add interface %s to VPN netId %u", interface.c_str(), mNetId);
109        return ret;
110    }
111    mInterfaces.insert(interface);
112    return 0;
113}
114
115int VirtualNetwork::removeInterface(const std::string& interface) {
116    if (!hasInterface(interface)) {
117        return 0;
118    }
119    if (int ret = RouteController::removeInterfaceFromVirtualNetwork(mNetId, interface.c_str(),
120                                                                     mSecure, mUidRanges)) {
121        ALOGE("failed to remove interface %s from VPN netId %u", interface.c_str(), mNetId);
122        return ret;
123    }
124    mInterfaces.erase(interface);
125    return 0;
126}
127
128}  // namespace net
129}  // namespace android
130