1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef NET_BASE_ADDRESS_TRACKER_LINUX_H_
6 #define NET_BASE_ADDRESS_TRACKER_LINUX_H_
8 #include <sys/socket.h> // Needed to include netlink.
9 // Mask superfluous definition of |struct net|. This is fixed in Linux 2.6.38.
10 #define net net_kernel
11 #include <linux/rtnetlink.h>
16 #include "base/basictypes.h"
17 #include "base/callback.h"
18 #include "base/compiler_specific.h"
19 #include "base/containers/hash_tables.h"
20 #include "base/message_loop/message_loop.h"
21 #include "base/synchronization/condition_variable.h"
22 #include "base/synchronization/lock.h"
23 #include "base/threading/thread_checker.h"
24 #include "net/base/net_util.h"
25 #include "net/base/network_change_notifier.h"
30 // Keeps track of network interface addresses using rtnetlink. Used by
31 // NetworkChangeNotifier to provide signals to registered IPAddressObservers.
32 class NET_EXPORT_PRIVATE AddressTrackerLinux :
33 public base::MessageLoopForIO::Watcher {
35 typedef std::map<IPAddressNumber, struct ifaddrmsg> AddressMap;
37 // Non-tracking version constructor: it takes a snapshot of the
38 // current system configuration. Once Init() returns, the
39 // configuration is available through GetOnlineLinks() and
41 AddressTrackerLinux();
43 // Tracking version constructor: it will run |address_callback| when
44 // the AddressMap changes, |link_callback| when the list of online
45 // links changes, and |tunnel_callback| when the list of online
47 AddressTrackerLinux(const base::Closure& address_callback,
48 const base::Closure& link_callback,
49 const base::Closure& tunnel_callback);
50 ~AddressTrackerLinux() override;
52 // In tracking mode, it starts watching the system configuration for
53 // changes. The current thread must have a MessageLoopForIO. In
54 // non-tracking mode, once Init() returns, a snapshot of the system
55 // configuration is available through GetOnlineLinks() and
59 AddressMap GetAddressMap() const;
61 // Returns set of interface indicies for online interfaces.
62 base::hash_set<int> GetOnlineLinks() const;
64 // Implementation of NetworkChangeNotifierLinux::GetCurrentConnectionType().
65 // Safe to call from any thread, but will block until Init() has completed.
66 NetworkChangeNotifier::ConnectionType GetCurrentConnectionType();
69 friend class AddressTrackerLinuxTest;
71 // In tracking mode, holds |lock| while alive. In non-tracking mode,
72 // enforces single-threaded access.
73 class AddressTrackerAutoLock {
75 AddressTrackerAutoLock(const AddressTrackerLinux& tracker,
77 ~AddressTrackerAutoLock();
80 const AddressTrackerLinux& tracker_;
82 DISALLOW_COPY_AND_ASSIGN(AddressTrackerAutoLock);
85 // A function that returns the name of an interface given the interface index
86 // in |interface_index|.
87 typedef const char* (*GetInterfaceNameFunction)(int interface_index);
89 // Sets |*address_changed| to indicate whether |address_map_| changed and
90 // sets |*link_changed| to indicate if |online_links_| changed and sets
91 // |*tunnel_changed| to indicate if |online_links_| changed with regards to a
92 // tunnel interface while reading messages from |netlink_fd_|.
93 void ReadMessages(bool* address_changed,
95 bool* tunnel_changed);
97 // Sets |*address_changed| to true if |address_map_| changed, sets
98 // |*link_changed| to true if |online_links_| changed, sets |*tunnel_changed|
99 // to true if |online_links_| changed with regards to a tunnel interface while
100 // reading the message from |buffer|.
101 void HandleMessage(char* buffer,
103 bool* address_changed,
105 bool* tunnel_changed);
107 // Call when some part of initialization failed; forces online and unblocks.
108 void AbortAndForceOnline();
110 // MessageLoopForIO::Watcher:
111 void OnFileCanReadWithoutBlocking(int fd) override;
112 void OnFileCanWriteWithoutBlocking(int /* fd */) override;
114 // Close |netlink_fd_|
117 // Does |msg| refer to a tunnel interface?
118 bool IsTunnelInterface(const struct ifinfomsg* msg) const;
120 // Gets the name of an interface given the interface index |interface_index|.
121 // May return empty string if it fails but should not return NULL. This is
122 // overridden by tests.
123 GetInterfaceNameFunction get_interface_name_;
125 base::Closure address_callback_;
126 base::Closure link_callback_;
127 base::Closure tunnel_callback_;
130 base::MessageLoopForIO::FileDescriptorWatcher watcher_;
132 mutable base::Lock address_map_lock_;
133 AddressMap address_map_;
135 // Set of interface indices for links that are currently online.
136 mutable base::Lock online_links_lock_;
137 base::hash_set<int> online_links_;
139 base::Lock is_offline_lock_;
141 bool is_offline_initialized_;
142 base::ConditionVariable is_offline_initialized_cv_;
145 // Used to verify single-threaded access in non-tracking mode.
146 base::ThreadChecker thread_checker_;
149 } // namespace internal
152 #endif // NET_BASE_ADDRESS_TRACKER_LINUX_H_