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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 // | 4 // |
| 5 // Handles packets for connection_ids in time wait state by discarding the | 5 // Handles packets for connection_ids in time wait state by discarding the |
| 6 // packet and sending the clients a public reset packet with exponential | 6 // packet and sending the clients a public reset packet with exponential |
| 7 // backoff. | 7 // backoff. |
| 8 | 8 |
| 9 #ifndef NET_TOOLS_QUIC_QUIC_TIME_WAIT_LIST_MANAGER_H_ | 9 #ifndef NET_TOOLS_QUIC_QUIC_TIME_WAIT_LIST_MANAGER_H_ |
| 10 #define NET_TOOLS_QUIC_QUIC_TIME_WAIT_LIST_MANAGER_H_ | 10 #define NET_TOOLS_QUIC_QUIC_TIME_WAIT_LIST_MANAGER_H_ |
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| 28 namespace tools { | 28 namespace tools { |
| 29 | 29 |
| 30 class ConnectionIdCleanUpAlarm; | 30 class ConnectionIdCleanUpAlarm; |
| 31 class QuicServerSessionVisitor; | 31 class QuicServerSessionVisitor; |
| 32 | 32 |
| 33 namespace test { | 33 namespace test { |
| 34 class QuicTimeWaitListManagerPeer; | 34 class QuicTimeWaitListManagerPeer; |
| 35 } // namespace test | 35 } // namespace test |
| 36 | 36 |
| 37 // Maintains a list of all connection_ids that have been recently closed. A | 37 // Maintains a list of all connection_ids that have been recently closed. A |
| 38 // connection_id lives in this state for kTimeWaitPeriod. All packets received | 38 // connection_id lives in this state for time_wait_period_. All packets received |
| 39 // for connection_ids in this state are handed over to the | 39 // for connection_ids in this state are handed over to the |
| 40 // QuicTimeWaitListManager by the QuicDispatcher. Decides whether to send a | 40 // QuicTimeWaitListManager by the QuicDispatcher. Decides whether to send a |
| 41 // public reset packet, a copy of the previously sent connection close packet, | 41 // public reset packet, a copy of the previously sent connection close packet, |
| 42 // or nothing to the client which sent a packet with the connection_id in time | 42 // or nothing to the client which sent a packet with the connection_id in time |
| 43 // wait state. After the connection_id expires its time wait period, a new | 43 // wait state. After the connection_id expires its time wait period, a new |
| 44 // connection/session will be created if a packet is received for this | 44 // connection/session will be created if a packet is received for this |
| 45 // connection_id. | 45 // connection_id. |
| 46 class QuicTimeWaitListManager : public QuicBlockedWriterInterface { | 46 class QuicTimeWaitListManager : public QuicBlockedWriterInterface { |
| 47 public: | 47 public: |
| 48 // writer - the entity that writes to the socket. (Owned by the dispatcher) | 48 // writer - the entity that writes to the socket. (Owned by the dispatcher) |
| 49 // visitor - the entity that manages blocked writers. (The dispatcher) | 49 // visitor - the entity that manages blocked writers. (The dispatcher) |
| 50 // epoll_server - used to run clean up alarms. (Owned by the dispatcher) | 50 // epoll_server - used to run clean up alarms. (Owned by the dispatcher) |
| 51 QuicTimeWaitListManager(QuicPacketWriter* writer, | 51 QuicTimeWaitListManager(QuicPacketWriter* writer, |
| 52 QuicServerSessionVisitor* visitor, | 52 QuicServerSessionVisitor* visitor, |
| 53 EpollServer* epoll_server, | 53 EpollServer* epoll_server, |
| 54 const QuicVersionVector& supported_versions); | 54 const QuicVersionVector& supported_versions); |
| 55 ~QuicTimeWaitListManager() override; | 55 ~QuicTimeWaitListManager() override; |
| 56 | 56 |
| 57 // Adds the given connection_id to time wait state for kTimeWaitPeriod. | 57 // Adds the given connection_id to time wait state for time_wait_period_. |
| 58 // Henceforth, any packet bearing this connection_id should not be processed | 58 // Henceforth, any packet bearing this connection_id should not be processed |
| 59 // while the connection_id remains in this list. If a non-nullptr | 59 // while the connection_id remains in this list. If a non-nullptr |
| 60 // |close_packet| is provided, it is sent again when packets are received for | 60 // |close_packet| is provided, the TimeWaitListManager takes ownership of it |
| 61 // added connection_ids. If nullptr, a public reset packet is sent with the | 61 // and sends it again when packets are received for added connection_ids. If |
| 62 // specified |version|. DCHECKs that connection_id is not already on the list. | 62 // nullptr, a public reset packet is sent with the specified |version|. |
| 63 void AddConnectionIdToTimeWait(QuicConnectionId connection_id, | 63 // DCHECKs that connection_id is not already on the list. "virtual" to |
| 64 QuicVersion version, | 64 // override in tests. |
| 65 QuicEncryptedPacket* close_packet); // Owned. | 65 virtual void AddConnectionIdToTimeWait(QuicConnectionId connection_id, |
| 66 QuicVersion version, |
| 67 QuicEncryptedPacket* close_packet); |
| 66 | 68 |
| 67 // Returns true if the connection_id is in time wait state, false otherwise. | 69 // Returns true if the connection_id is in time wait state, false otherwise. |
| 68 // Packets received for this connection_id should not lead to creation of new | 70 // Packets received for this connection_id should not lead to creation of new |
| 69 // QuicSessions. | 71 // QuicSessions. |
| 70 bool IsConnectionIdInTimeWait(QuicConnectionId connection_id) const; | 72 bool IsConnectionIdInTimeWait(QuicConnectionId connection_id) const; |
| 71 | 73 |
| 72 // Called when a packet is received for a connection_id that is in time wait | 74 // Called when a packet is received for a connection_id that is in time wait |
| 73 // state. Sends a public reset packet to the client which sent this | 75 // state. Sends a public reset packet to the client which sent this |
| 74 // connection_id. Sending of the public reset packet is throttled by using | 76 // connection_id. Sending of the public reset packet is throttled by using |
| 75 // exponential back off. DCHECKs for the connection_id to be in time wait | 77 // exponential back off. DCHECKs for the connection_id to be in time wait |
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| 166 | 168 |
| 167 // Pending public reset packets that need to be sent out to the client | 169 // Pending public reset packets that need to be sent out to the client |
| 168 // when we are given a chance to write by the dispatcher. | 170 // when we are given a chance to write by the dispatcher. |
| 169 std::deque<QueuedPacket*> pending_packets_queue_; | 171 std::deque<QueuedPacket*> pending_packets_queue_; |
| 170 | 172 |
| 171 // Used to schedule alarms to delete old connection_ids which have been in the | 173 // Used to schedule alarms to delete old connection_ids which have been in the |
| 172 // list for too long. | 174 // list for too long. |
| 173 EpollServer* epoll_server_; | 175 EpollServer* epoll_server_; |
| 174 | 176 |
| 175 // Time period for which connection_ids should remain in time wait state. | 177 // Time period for which connection_ids should remain in time wait state. |
| 176 const QuicTime::Delta kTimeWaitPeriod_; | 178 const QuicTime::Delta time_wait_period_; |
| 177 | 179 |
| 178 // Alarm registered with the epoll server to clean up connection_ids that have | 180 // Alarm registered with the epoll server to clean up connection_ids that have |
| 179 // out lived their duration in time wait state. | 181 // out lived their duration in time wait state. |
| 180 scoped_ptr<ConnectionIdCleanUpAlarm> connection_id_clean_up_alarm_; | 182 scoped_ptr<ConnectionIdCleanUpAlarm> connection_id_clean_up_alarm_; |
| 181 | 183 |
| 182 // Clock to efficiently measure approximate time from the epoll server. | 184 // Clock to efficiently measure approximate time from the epoll server. |
| 183 QuicEpollClock clock_; | 185 QuicEpollClock clock_; |
| 184 | 186 |
| 185 // Interface that writes given buffer to the socket. | 187 // Interface that writes given buffer to the socket. |
| 186 QuicPacketWriter* writer_; | 188 QuicPacketWriter* writer_; |
| 187 | 189 |
| 188 // Interface that manages blocked writers. | 190 // Interface that manages blocked writers. |
| 189 QuicServerSessionVisitor* visitor_; | 191 QuicServerSessionVisitor* visitor_; |
| 190 | 192 |
| 191 DISALLOW_COPY_AND_ASSIGN(QuicTimeWaitListManager); | 193 DISALLOW_COPY_AND_ASSIGN(QuicTimeWaitListManager); |
| 192 }; | 194 }; |
| 193 | 195 |
| 194 } // namespace tools | 196 } // namespace tools |
| 195 } // namespace net | 197 } // namespace net |
| 196 | 198 |
| 197 #endif // NET_TOOLS_QUIC_QUIC_TIME_WAIT_LIST_MANAGER_H_ | 199 #endif // NET_TOOLS_QUIC_QUIC_TIME_WAIT_LIST_MANAGER_H_ |
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