net/tools/quic/quic_dispatcher.h

   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.
   4 //
   5 // A server side dispatcher which dispatches a given client's data to their
   6 // stream.
   7
   8 #ifndef NET_TOOLS_QUIC_QUIC_DISPATCHER_H_
   9 #define NET_TOOLS_QUIC_QUIC_DISPATCHER_H_
  10
  11 #include <list>
  12
  13 #include "base/basictypes.h"
  14 #include "base/containers/hash_tables.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "net/base/ip_endpoint.h"
  17 #include "net/base/linked_hash_map.h"
  18 #include "net/quic/quic_blocked_writer_interface.h"
  19 #include "net/quic/quic_protocol.h"
  20 #include "net/tools/epoll_server/epoll_server.h"
  21 #include "net/tools/quic/quic_server_session.h"
  22 #include "net/tools/quic/quic_time_wait_list_manager.h"
  23
  24 #if defined(COMPILER_GCC)
  25 namespace BASE_HASH_NAMESPACE {
  26 template<>
  27 struct hash<net::QuicBlockedWriterInterface*> {
  28   std::size_t operator()(
  29       const net::QuicBlockedWriterInterface* ptr) const {
  30     return hash<size_t>()(reinterpret_cast<size_t>(ptr));
  31   }
  32 };
  33 }
  34 #endif
  35
  36 namespace net {
  37
  38 class EpollServer;
  39 class QuicConfig;
  40 class QuicCryptoServerConfig;
  41 class QuicSession;
  42
  43 namespace tools {
  44
  45 class QuicPacketWriterWrapper;
  46
  47 namespace test {
  48 class QuicDispatcherPeer;
  49 }  // namespace test
  50
  51 class DeleteSessionsAlarm;
  52 class QuicEpollConnectionHelper;
  53
  54 class QuicDispatcher : public QuicServerSessionVisitor {
  55  public:
  56   // Ideally we'd have a linked_hash_set: the  boolean is unused.
  57   typedef linked_hash_map<QuicBlockedWriterInterface*, bool> WriteBlockedList;
  58
  59   // Due to the way delete_sessions_closure_ is registered, the Dispatcher
  60   // must live until epoll_server Shutdown. |supported_versions| specifies the
  61   // list of supported QUIC versions.
  62   QuicDispatcher(const QuicConfig& config,
  63                  const QuicCryptoServerConfig& crypto_config,
  64                  const QuicVersionVector& supported_versions,
  65                  EpollServer* epoll_server,
  66                  uint32 initial_flow_control_window_bytes);
  67
  68   virtual ~QuicDispatcher();
  69
  70   virtual void Initialize(int fd);
  71
  72   // Process the incoming packet by creating a new session, passing it to
  73   // an existing session, or passing it to the TimeWaitListManager.
  74   virtual void ProcessPacket(const IPEndPoint& server_address,
  75                              const IPEndPoint& client_address,
  76                              const QuicEncryptedPacket& packet);
  77
  78   // Called when the socket becomes writable to allow queued writes to happen.
  79   virtual void OnCanWrite();
  80
  81   // Returns true if there's anything in the blocked writer list.
  82   virtual bool HasPendingWrites() const;
  83
  84   // Sends ConnectionClose frames to all connected clients.
  85   void Shutdown();
  86
  87   // QuicServerSessionVisitor interface implementation:
  88   // Ensure that the closed connection is cleaned up asynchronously.
  89   virtual void OnConnectionClosed(QuicConnectionId connection_id,
  90                                   QuicErrorCode error) OVERRIDE;
  91
  92   // Queues the blocked writer for later resumption.
  93   virtual void OnWriteBlocked(QuicBlockedWriterInterface* writer) OVERRIDE;
  94
  95   typedef base::hash_map<QuicConnectionId, QuicSession*> SessionMap;
  96
  97   // Deletes all sessions on the closed session list and clears the list.
  98   void DeleteSessions();
  99
 100   const SessionMap& session_map() const { return session_map_; }
 101
 102   WriteBlockedList* write_blocked_list() { return &write_blocked_list_; }
 103
 104  protected:
 105   // Instantiates a new low-level packet writer. Caller takes ownership of the
 106   // returned object.
 107   virtual QuicPacketWriter* CreateWriter(int fd);
 108
 109   virtual QuicSession* CreateQuicSession(QuicConnectionId connection_id,
 110                                          const IPEndPoint& server_address,
 111                                          const IPEndPoint& client_address);
 112
 113   virtual QuicConnection* CreateQuicConnection(
 114       QuicConnectionId connection_id,
 115       const IPEndPoint& server_address,
 116       const IPEndPoint& client_address);
 117
 118   // Called by |framer_visitor_| when the public header has been parsed.
 119   virtual bool OnUnauthenticatedPublicHeader(
 120       const QuicPacketPublicHeader& header);
 121
 122   // Create and return the time wait list manager for this dispatcher, which
 123   // will be owned by the dispatcher as time_wait_list_manager_
 124   virtual QuicTimeWaitListManager* CreateQuicTimeWaitListManager();
 125
 126   // Replaces the packet writer with |writer|. Takes ownership of |writer|.
 127   void set_writer(QuicPacketWriter* writer) {
 128     writer_.reset(writer);
 129   }
 130
 131   QuicTimeWaitListManager* time_wait_list_manager() {
 132     return time_wait_list_manager_.get();
 133   }
 134
 135   EpollServer* epoll_server() { return epoll_server_; }
 136
 137   const QuicVersionVector& supported_versions() const {
 138     return supported_versions_;
 139   }
 140
 141   const QuicVersionVector& supported_versions_no_flow_control() const {
 142     return supported_versions_no_flow_control_;
 143   }
 144
 145   const QuicVersionVector& supported_versions_no_connection_flow_control()
 146       const {
 147     return supported_versions_no_connection_flow_control_;
 148   }
 149
 150   const IPEndPoint& current_server_address() {
 151     return current_server_address_;
 152   }
 153   const IPEndPoint& current_client_address() {
 154     return current_client_address_;
 155   }
 156   const QuicEncryptedPacket& current_packet() {
 157     return *current_packet_;
 158   }
 159
 160   const QuicConfig& config() const { return config_; }
 161
 162   const QuicCryptoServerConfig& crypto_config() const { return crypto_config_; }
 163
 164   QuicFramer* framer() { return &framer_; }
 165
 166   QuicEpollConnectionHelper* helper() { return helper_.get(); }
 167
 168   QuicPacketWriter* writer() { return writer_.get(); }
 169
 170   const uint32 initial_flow_control_window_bytes() const {
 171     return initial_flow_control_window_bytes_;
 172   }
 173
 174  private:
 175   class QuicFramerVisitor;
 176   friend class net::tools::test::QuicDispatcherPeer;
 177
 178   // Called by |framer_visitor_| when the private header has been parsed
 179   // of a data packet that is destined for the time wait manager.
 180   void OnUnauthenticatedHeader(const QuicPacketHeader& header);
 181
 182   // Removes the session from the session map and write blocked list, and
 183   // adds the ConnectionId to the time-wait list.
 184   void CleanUpSession(SessionMap::iterator it);
 185
 186   bool HandlePacketForTimeWait(const QuicPacketPublicHeader& header);
 187
 188   const QuicConfig& config_;
 189
 190   const QuicCryptoServerConfig& crypto_config_;
 191
 192   // The list of connections waiting to write.
 193   WriteBlockedList write_blocked_list_;
 194
 195   SessionMap session_map_;
 196
 197   // Entity that manages connection_ids in time wait state.
 198   scoped_ptr<QuicTimeWaitListManager> time_wait_list_manager_;
 199
 200   // An alarm which deletes closed sessions.
 201   scoped_ptr<DeleteSessionsAlarm> delete_sessions_alarm_;
 202
 203   // The list of closed but not-yet-deleted sessions.
 204   std::list<QuicSession*> closed_session_list_;
 205
 206   EpollServer* epoll_server_;  // Owned by the server.
 207
 208   // The helper used for all connections.
 209   scoped_ptr<QuicEpollConnectionHelper> helper_;
 210
 211   // The writer to write to the socket with.
 212   scoped_ptr<QuicPacketWriter> writer_;
 213
 214   // This vector contains QUIC versions which we currently support.
 215   // This should be ordered such that the highest supported version is the first
 216   // element, with subsequent elements in descending order (versions can be
 217   // skipped as necessary).
 218   const QuicVersionVector supported_versions_;
 219
 220   // Versions which do not support flow control (introduced in QUIC_VERSION_17).
 221   // This is used to construct new QuicConnections when flow control is disabled
 222   // via flag.
 223   // TODO(rjshade): Remove this when
 224   // FLAGS_enable_quic_stream_flow_control_2 is removed.
 225   QuicVersionVector supported_versions_no_flow_control_;
 226   // Versions which do not support *connection* flow control (introduced in
 227   // QUIC_VERSION_19).
 228   // This is used to construct new QuicConnections when connection flow control
 229   // is disabled via flag.
 230   // TODO(rjshade): Remove this when
 231   // FLAGS_enable_quic_connection_flow_control is removed.
 232   QuicVersionVector supported_versions_no_connection_flow_control_;
 233
 234   // Information about the packet currently being handled.
 235   IPEndPoint current_client_address_;
 236   IPEndPoint current_server_address_;
 237   const QuicEncryptedPacket* current_packet_;
 238
 239   QuicFramer framer_;
 240   scoped_ptr<QuicFramerVisitor> framer_visitor_;
 241
 242   // Initial flow control window size to advertize to peer on newly created
 243   // connections.
 244   const uint32 initial_flow_control_window_bytes_;
 245
 246   DISALLOW_COPY_AND_ASSIGN(QuicDispatcher);
 247 };
 248
 249 }  // namespace tools
 250 }  // namespace net
 251
 252 #endif  // NET_TOOLS_QUIC_QUIC_DISPATCHER_H_