| // Copyright (c) 2011 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef SHILL_RTNL_HANDLER_ |
| #define SHILL_RTNL_HANDLER_ |
| |
| #include <vector> |
| |
| #include <base/callback_old.h> |
| #include <base/hash_tables.h> |
| #include <base/memory/ref_counted.h> |
| #include <base/memory/scoped_ptr.h> |
| |
| #include "shill/device.h" |
| |
| #include "shill/io_handler.h" |
| #include "shill/rtnl_listener.h" |
| #include "shill/shill_event.h" |
| |
| struct nlmsghdr; |
| |
| namespace shill { |
| |
| // This singleton class is responsible for interacting with the RTNL |
| // subsystem. RTNL provides (among other things) access to interface |
| // discovery (add/remove events), interface state monitoring and the |
| // ability to change interace flags. Similar functionality also exists |
| // for IP address configuration for interfaces and IP routing tables. |
| // |
| // RTNLHandler provides access to these events through a callback |
| // system and provides utility functions to make changes to interface, |
| // address and routing state. |
| class RTNLHandler { |
| public: |
| RTNLHandler(); |
| ~RTNLHandler(); |
| |
| // Since this is a singleton, use RTNHandler::GetInstance()->Foo() |
| static RTNLHandler *GetInstance(); |
| |
| // This starts the event-monitoring function of the RTNL handler. |
| // This function requires an EventDispatcher pointer so it can add |
| // itself to the event loop. |
| void Start(EventDispatcher *dispatcher); |
| // This stops the event-monitoring function of the RTNL handler |
| void Stop(); |
| |
| // Add an RTNL event listener to the list of entities that will |
| // be notified of RTNL events. |
| void AddListener(RTNLListener *to_add); |
| // Remove a previously added RTNL event listener |
| void RemoveListener(RTNLListener *to_remove); |
| |
| // Set flags on a network interface that has an kernel index of |
| // 'interface_index'. Only the flags bits set in 'change' will |
| // be set, and they will be set to the corresponding bit in 'flags'. |
| void SetInterfaceFlags(int interface_index, unsigned int flags, |
| unsigned int change); |
| // Request that various tables (link, address, routing) tables be |
| // exhaustively dumped via RTNL. As results arrive from the kernel |
| // they will be broadcast to all listeners. The possible values |
| // (multiple can be ORred together) are below. |
| void RequestDump(int request_flags); |
| |
| static const int kRequestLink = 1; |
| static const int kRequestAddr = 2; |
| static const int kRequestRoute = 4; |
| |
| private: |
| // Dispatches an rtnl message to all listeners |
| void DispatchEvent(int type, struct nlmsghdr *hdr); |
| // Send the next table-dump request to the kernel |
| void NextRequest(uint32_t seq); |
| // Parse an incoming rtnl message from the kernel |
| void ParseRTNL(InputData *data); |
| |
| bool running_; |
| bool in_request_; |
| |
| int rtnl_socket_; |
| uint32_t request_flags_; |
| uint32_t request_sequence_; |
| |
| std::vector<RTNLListener *> listeners_; |
| scoped_ptr<Callback1<InputData *>::Type> rtnl_callback_; |
| scoped_ptr<IOInputHandler> rtnl_handler_; |
| |
| friend class RTNLHandlerTest; |
| DISALLOW_COPY_AND_ASSIGN(RTNLHandler); |
| }; |
| |
| } // namespace shill |
| |
| #endif // SHILL_RTNL_HANDLER_ |