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
VirtualNetwork(unsigned netId,bool hasDns,bool secure)26 VirtualNetwork::VirtualNetwork(unsigned netId, bool hasDns, bool secure) :
27 Network(netId), mHasDns(hasDns), mSecure(secure) {
28 }
29
~VirtualNetwork()30 VirtualNetwork::~VirtualNetwork() {
31 }
32
getHasDns() const33 bool VirtualNetwork::getHasDns() const {
34 return mHasDns;
35 }
36
isSecure() const37 bool VirtualNetwork::isSecure() const {
38 return mSecure;
39 }
40
appliesToUser(uid_t uid) const41 bool VirtualNetwork::appliesToUser(uid_t uid) const {
42 return mUidRanges.hasUid(uid);
43 }
44
45
maybeCloseSockets(bool add,const UidRanges & uidRanges,const std::set<uid_t> & protectableUsers)46 int VirtualNetwork::maybeCloseSockets(bool add, const UidRanges& uidRanges,
47 const std::set<uid_t>& protectableUsers) {
48 if (!mSecure) {
49 return 0;
50 }
51
52 SockDiag sd;
53 if (!sd.open()) {
54 return -EBADFD;
55 }
56
57 if (int ret = sd.destroySockets(uidRanges, protectableUsers, true /* excludeLoopback */)) {
58 ALOGE("Failed to close sockets while %s %s to network %d: %s",
59 add ? "adding" : "removing", uidRanges.toString().c_str(), mNetId, strerror(-ret));
60 return ret;
61 }
62
63 return 0;
64 }
65
addUsers(const UidRanges & uidRanges,const std::set<uid_t> & protectableUsers)66 int VirtualNetwork::addUsers(const UidRanges& uidRanges, const std::set<uid_t>& protectableUsers) {
67 maybeCloseSockets(true, uidRanges, protectableUsers);
68
69 for (const std::string& interface : mInterfaces) {
70 if (int ret = RouteController::addUsersToVirtualNetwork(mNetId, interface.c_str(), mSecure,
71 uidRanges)) {
72 ALOGE("failed to add users on interface %s of netId %u", interface.c_str(), mNetId);
73 return ret;
74 }
75 }
76 mUidRanges.add(uidRanges);
77 return 0;
78 }
79
removeUsers(const UidRanges & uidRanges,const std::set<uid_t> & protectableUsers)80 int VirtualNetwork::removeUsers(const UidRanges& uidRanges,
81 const std::set<uid_t>& protectableUsers) {
82 maybeCloseSockets(false, uidRanges, protectableUsers);
83
84 for (const std::string& interface : mInterfaces) {
85 if (int ret = RouteController::removeUsersFromVirtualNetwork(mNetId, interface.c_str(),
86 mSecure, uidRanges)) {
87 ALOGE("failed to remove users on interface %s of netId %u", interface.c_str(), mNetId);
88 return ret;
89 }
90 }
91 mUidRanges.remove(uidRanges);
92 return 0;
93 }
94
getType() const95 Network::Type VirtualNetwork::getType() const {
96 return VIRTUAL;
97 }
98
addInterface(const std::string & interface)99 int VirtualNetwork::addInterface(const std::string& interface) {
100 if (hasInterface(interface)) {
101 return 0;
102 }
103 if (int ret = RouteController::addInterfaceToVirtualNetwork(mNetId, interface.c_str(), mSecure,
104 mUidRanges)) {
105 ALOGE("failed to add interface %s to VPN netId %u", interface.c_str(), mNetId);
106 return ret;
107 }
108 mInterfaces.insert(interface);
109 return 0;
110 }
111
removeInterface(const std::string & interface)112 int VirtualNetwork::removeInterface(const std::string& interface) {
113 if (!hasInterface(interface)) {
114 return 0;
115 }
116 if (int ret = RouteController::removeInterfaceFromVirtualNetwork(mNetId, interface.c_str(),
117 mSecure, mUidRanges)) {
118 ALOGE("failed to remove interface %s from VPN netId %u", interface.c_str(), mNetId);
119 return ret;
120 }
121 mInterfaces.erase(interface);
122 return 0;
123 }
124