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- [BUGFIX] Do not abort conn on STREAM frame for a reset stream - [BUGFIX] Drop packets that would become empty due to repackaging. Packets on the scheduled queue may be marked for repackaging. Frames such as ACK frame that are never resent are removed from repackaged packets. We must check that the newly repackaged packet would not be empty. If it would be, it is destroyed instead and the next packet on the scheduled queue is used. Note that this change only affects the logic to return the next packet to be sent. Lost packets that are being rescheduled are already processed in this fashion. - Byteswap CID before logging it - this makes it match Chrome CIDs. (Except Q035, which is the last little-endian GQUIC version we support.)
459 lines
17 KiB
Text
459 lines
17 KiB
Text
2018-09-12
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- 1.14.3
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- [BUGFIX] Do not abort conn on STREAM frame for a reset stream
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- [BUGFIX] Drop packets that would become empty due to repackaging.
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Packets on the scheduled queue may be marked for repackaging.
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Frames such as ACK frame that are never resent are removed from
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repackaged packets. We must check that the newly repackaged packet
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would not be empty. If it would be, it is destroyed instead and
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the next packet on the scheduled queue is used. Note that this
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change only affects the logic to return the next packet to be sent.
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Lost packets that are being rescheduled are already processed in
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this fashion.
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- Byteswap CID before logging it - this makes it match Chrome CIDs.
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(Except Q035, which is the last little-endian GQUIC version we
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support.)
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2018-09-06
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- 1.14.0
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- [API Change] Disable packet sending if full batch cannot be sent
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If lsquic_packets_out_f() cannot send the whole batch, disable
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packet sending until lsquic_engine_send_unsent_packets() is called.
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- [BUGFIX] Handle case when STREAM frame does not fit.
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- [BUGFIX] Always allow incoming STREAM frames to overlap. Peers
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may send overlapping STREAM frames even if using versions older
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than Q043.
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- Custom header set fixes:
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- set "FIN reached" flag when custom header with FIN flag is
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claimed;
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- do not return custom header set for a reset stream.
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2018-08-27
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- 1.13.0
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- [FEATURE, API Change] Add ability to create custom header set
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objects via callbacks. This avoids reading and re-parsing
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headers from the stream.
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2018-08-27
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- 1.12.4
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- Fix memory leak when engine is destroyed
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- Fix memory leak in http_client
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- Fix gcc warning in unit tests
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2018-08-22
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- 1.12.3
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- [BUGFIX] Fix duplicate STREAM frame detection
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2018-08-20
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- 1.12.2
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- [BUGFIX] Update count of scheduled bytes when adjusting size of
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an already-scheduled packet.
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- Emit info instead of warning messages when stream is used in
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unexpected ways.
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2018-08-17
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- 1.12.0
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- [FEATURE, API Change] Add support for certificate verification
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2018-08-16
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- 1.11.1
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- [BUGFIX] Fix STOP_WAITING frame processing in the new Q044 code
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2018-08-15
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- 1.11.0
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- [FEATURE] Add support for Q044.
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2018-08-09
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- 1.10.2
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- [BUGFIX] Don't go over limit when creating delayed streams
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2018-07-10
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- 1.10.1
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- [BUGFIX] process connections after each batch of packets is read
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This avoids a problem of accumulating a very large list of packets
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(possible when speeds are high and socket's receive buffer is large)
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and processing it all at once.
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- If glibc is older than 2.17, link with rt. This is necessary for
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clock_getres(2).
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- Add version macros to lsquic.h; remove unnecessary includes.
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2018-06-13
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- [BUGFIX] allow multiple parallel connections by default
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Use the original method of tracking connections by CIDs by default.
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If zero-sized CID support is turned on, connections are tracked by
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the address. A new connection is not created if another connection
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is using the same network address
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2018-05-30
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- [FEATURE, API CHANGE] Support zero-sized CIDs in received packets
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2018-05-24
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- Close connection properly when packet encryption fails
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2018-05-23
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- [BUGFIX] Do not produce packet sequence gaps due to delayed packets
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2018-05-21
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- [API Change] Add optional callback to call when handshake is done
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- [API Change, BUGFIX] After send failure, wait until transport available
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2018-05-18
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- [API] Expose useful lsquic_ver2str[] in lsquic.h
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- [BUGFIX] Do not produce packet sequence gaps due to STREAM frame elision
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- Improve checks of number of incoming streams limit and associated
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error reporting.
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- [BUGFIX] Command-line option `-6` now works correctly.
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2018-05-16
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- [FEATURE] DNS resolution
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- [BUGFIX] Frame insertion mis-ID as overlap instead of dup
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- http_client: fix priority range generated by -E flag
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2018-05-09
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- [FEATURE] Add support for Q043.
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- Support for versions Q037, Q038, Q041, and Q042 has been removed.
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- Fix typo in debug message.
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- Fix code indentation.
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- Add /* fallthru */ comment to stop newer gcc from complaining.
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- Logger: fix compilation of optimized Windows build.
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2018-05-04
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- [FEATURE] Add support for Q042.
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- Remove comment: MSPC is obsolete (no code changes)
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- Prog: use lsquic_str2ver() when processing -o version flag
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- Remove unused CTIM and SRBF transport parameters
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- Disable QUIC versions Q037 and Q038 by default
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- Fix Windows compilation by including compat header file in
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lshpack.c
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- Address warnings produced by newer versions of gcc
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- Future-proof: turn off -Werror
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2018-05-02
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- [BUGFIX] Make lsquic_conn_quic_version() available
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- Switch to using ls-hpack 1.1
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- [BUGFIX] Do not ignore stream resets after receiving FIN
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2018-04-27
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- HPACK: do not allow header block to end with table size update.
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2018-04-25
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- [BUGFIX] Do not create gap in sent packnos when squeezing delayed
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packets.
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- [BUGFIX] sendctl checks for all unacked bytes, not just retx bytes.
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- [BUGFIX] connections with blocked scheduled packets are not tickable
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for sending.
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- [BUGFIX] Conn is tickable if it wants to send a connection-level
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frame.
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2018-04-23
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- Fix busy loop: tickable must make progress. When connection is
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self-reporting as tickable, it must make progress when ticked. There
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are two issues:
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1. If there are buffered packets, the connection is only tickable if
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they can be sent out.
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2. A connection is tickable if there are streams on the servicing
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queue. When the tick occurs, we must service the stream
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independent of whether any packets are sent.
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- Fix assertion in pacer which can be incorrect under some
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conditions.
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- cmake: do not turn on address sanitizer if in Travis.
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2018-04-20
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- [BUGFIX] Fix bug in lsquic_engine_connect() exposed by yesterday's
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changes.
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2018-04-19
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- [BUGFIX] Add connection to Tickable Queue on stream write
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- cmake: use MSVC variable instead of trying to detect
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- engine: improve connection incref/decref logging
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- stream: don't ignore errors that may occur on triggered flush
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- connection: remove obsolete method
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- engine: indicate connection as tickable if previous call went
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over threshold
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2018-04-09
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[API Change, OPTIMIZATION] Only process conns that need to be processed
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The API is simplified: do not expose the user code to several
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queues. A "connection queue" is now an internal concept.
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The user processes connections using the single function
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lsquic_engine_process_conns(). When this function is called,
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only those connections are processed that need to be processed.
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A connection needs to be processed when:
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1. New incoming packets have been fed to the connection.
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2. User wants to read from a stream that is readable.
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3. User wants to write to a stream that is writeable.
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4. There are buffered packets that can be sent out. (This
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means that the user wrote to a stream outside of the
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lsquic library callback.)
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5. A control frame (such as BLOCKED) needs to be sent out.
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6. A stream needs to be serviced or delayed stream needs to
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be created.
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7. An alarm rings.
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8. Pacer timer expires.
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To achieve this, the library places the connections into two
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priority queues (min heaps):
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1. Tickable Queue; and
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2. Advisory Tick Time queue (ATTQ).
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Each time lsquic_engine_process_conns() is called, the Tickable
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Queue is emptied. After the connections have been ticked, they are
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queried again: if a connection is not being closed, it is placed
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either in the Tickable Queue if it is ready to be ticked again or
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it is placed in the Advisory Tick Time Queue. It is assumed that
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a connection always has at least one timer set (the idle alarm).
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The connections in the Tickable Queue are arranged in the least
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recently ticked order. This lets connections that have been quiet
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longer to get their packets scheduled first.
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This change means that the library no longer needs to be ticked
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periodically. The user code can query the library when is the
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next tick event and schedule it exactly. When connections are
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processed, only the tickable connections are processed, not *all*
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the connections. When there are no tick events, it means that no
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timer event is necessary -- only the file descriptor READ event
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is active.
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The following are improvements and simplifications that have
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been triggered:
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- Queue of connections with incoming packets is gone.
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- "Pending Read/Write Events" Queue is gone (along with its
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history and progress checks). This queue has become the
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Tickable Queue.
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- The connection hash no longer needs to track the connection
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insertion order.
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2018-04-02
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- [FEATURE] Windows support
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- Reduce stack use -- outgoing packet batch is now allocated on the heap.
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2018-03-09
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- [OPTIMIZATION] Merge series of ACKs if possible
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Parsed single-range ACK frames (that is the majority of frames) are
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saved in the connection and their processing is deferred until the
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connection is ticked. If several ACKs come in a series between
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adjacent ticks, we check whether the latest ACK is a strict superset
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of the saved ACK. If it is, the older ACK is not processed.
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If ACK frames can be merged, they are merged and only one of them is
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either processed or saved.
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- [OPTIMIZATION] Speed up ACK verification by simplifying send history.
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Never generate a gap in the sent packet number sequence. This reduces
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the send history to a single number instead of potentially a series of
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packet ranges and thereby speeds up ACK verification.
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By default, detecting a gap in the send history is not fatal: only a
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single warning is generated per connection. The connection can continue
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to operate even if the ACK verification code is not able to detect some
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inconsistencies.
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- [OPTIMIZATION] Rearrange the lsquic_send_ctl struct
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The first part of struct lsquic_send_ctl now consists of members that
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are used in lsquic_send_ctl_got_ack() (in the absense of packet loss,
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which is the normal case). To speed up reads and writes, we no longer
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try to save space by using 8- and 16-bit integers. Use regular integer
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width for everything.
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- [OPTIMIZATION] Cache size of sent packet.
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- [OPTIMIZATION] Keep track of the largest ACKed in packet_out
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Instead of parsing our own ACK frames when packet has been acked,
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use the value saved in the packet_out structure when the ACK frame
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was generated.
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- [OPTIMIZATION] Take RTT sampling conditional out of ACK loop
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- [OPTIMIZATION] ACK processing: only call clock_gettime() if needed
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- [OPTIMIZATION] Several code-level optimizations to ACK processing.
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- Fix: http_client: fix -I flag; switch assert() to abort()
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2018-02-26
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- [API Change] lsquic_engine_connect() returns pointer to the connection
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object.
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- [API Change] Add lsquic_conn_get_engine() to get engine object from
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connection object.
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- [API Change] Add lsquic_conn_status() to query connection status.
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- [API Change] Add add lsquic_conn_set_ctx().
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- [API Change] Add new timestamp format, e.g. 2017-03-21 13:43:46.671345
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- [OPTIMIZATION] Process handshake STREAM frames as soon as packet
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arrives.
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- [OPTIMIZATION] Do not compile expensive send controller sanity check
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by default.
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- [OPTIMIZATION] Add fast path to gquic_be_gen_reg_pkt_header.
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- [OPTIMIZATION] Only make squeeze function call if necessary.
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- [OPTIMIZATION] Speed up Q039 ACK frame parsing.
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- [OPTIMIZATION] Fit most used elements of packet_out into first 64 bytes.
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- [OPTIMIZATION] Keep track of scheduled bytes instead of calculating.
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- [OPTIMIZATION] Prefetch next unacked packet when processing ACK.
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- [OPTIMIZATION] Leverage fact that ACK ranges and unacked list are.
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ordered.
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- [OPTIMIZATION] Reduce function pointer use for STREAM frame generation
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- Fix: reset incoming streams that arrive after we send GOAWAY.
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- Fix: delay client on_new_conn() call until connection is fully set up.
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- Fixes to buffered packets logic: splitting, STREAM frame elision.
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- Fix: do not dispatch on_write callback if no packets are available.
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- Fix WINDOW_UPDATE send and resend logic.
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- Fix STREAM frame extension code.
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- Fix: Drop unflushed data when stream is reset.
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- Switch to tracking CWND using bytes rather than packets.
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- Fix TCP friendly adjustment in cubic.
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- Fix: do not generate invalid STOP_WAITING frames during high packet
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loss.
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- Pacer fixes.
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2017-12-18
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- Fix: better follow cubic curve after idle period
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- Fix: add missing parts to outgoing packet splitting code
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- Fix: compilation using gcc 4.8.4
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2017-10-31
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- Add APIs.txt -- describes LSQUIC APIs
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2017-10-31
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- [API Change] Sendfile-like functionality is gone. The stream no
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longer opens files and deals with file descriptors. (Among other
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things, this makes the code more portable.) Three writing functions
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are provided:
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lsquic_stream_write
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lsquic_stream_writev
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lsquic_stream_writef (NEW)
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lsquic_stream_writef() is given an abstract reader that has function
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pointers for size() and read() functions which the user can implement.
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This is the most flexible way. lsquic_stream_write() and
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lsquic_stream_writev() are now both implemented as wrappers around
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lsquic_stream_writef().
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- [OPTIMIZATION] When writing to stream, be it within or without the
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on_write() callback, place data directly into packet buffer,
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bypassing auxiliary data structures. This reduces amount of memory
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required, for the amount of data that can be written is limited
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by the congestion window.
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To support writes outside the on_write() callback, we keep N
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outgoing packet buffers per connection which can be written to
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by any stream. One half of these are reserved for the highest
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priority stream(s), the other half for all other streams. This way,
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low-priority streams cannot write instead of high-priority streams
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and, on the other hand, low-priority streams get a chance to send
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their packets out.
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The algorithm is as follows:
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- When user writes to stream outside of the callback:
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- If this is the highest priority stream, place it onto the
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reserved N/2 queue or fail.
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(The actual size of this queue is dynamic -- MAX(N/2, CWND) --
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rather than N/2, allowing high-priority streams to write as
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much as can be sent.)
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- If the stream is not the highest priority, try to place the
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data onto the reserved N/2 queue or fail.
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- When tick occurs *and* more packets can be scheduled:
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- Transfer packets from the high N/2 queue to the scheduled
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queue.
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- If more scheduling is allowed:
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- Call on_write callbacks for highest-priority streams,
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placing resulting packets directly onto the scheduled queue.
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- If more scheduling is allowed:
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- Transfer packets from the low N/2 queue to the scheduled
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queue.
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- If more scheduling is allowed:
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- Call on_write callbacks for non-highest-priority streams,
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placing resulting packets directly onto the scheduled queue
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The number N is currently 20, but it could be varied based on
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resource usage.
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- If stream is created due to incoming headers, make headers readable
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from on_new.
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- Outgoing packets are no longer marked non-writeable to prevent placing
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more than one STREAM frame from the same stream into a single packet.
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This property is maintained via code flow and an explicit check.
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Packets for stream data are allocated using a special function.
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- STREAM frame elision is cheaper, as we only perform it if a reset
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stream has outgoing packets referencing it.
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- lsquic_packet_out_t is smaller, as stream_rec elements are now
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inside a union.
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2017-10-12
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- Do not send RST_STREAM when stream is closed for reading
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- Raise maximum header size from 4K to 64K
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- Check header name and value lengths against maximum imposed by HPACK
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- Fix NULL dereference in stream flow controller
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2017-10-09
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- Hide handshake implementation behind a set of function pointers
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- Use monotonically increasing clock
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- Make sure that retx delay is not larger than the max of 60 seconds
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2017-09-29
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- A few fixes to code and README
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2017-09-28
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- Add support for Q041; drop support for Q040
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2017-09-27
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- Fix CMakeLists.txt: BoringSSL include and lib was mixed up
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2017-09-26
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- Add support for Mac OS
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- Add support for Raspberry Pi
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- Fix BoringSSL compilation: include <openssl/hmac.h> explicitly
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2017-09-22
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- Initial release
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