| Commit message (Collapse) | Author | Age |
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The logical quic connection state is tested by handler functions that
process corresponding types of packets (initial/handshake/application).
The packet is declined if state is incorrect.
No timeout is required for the input queue.
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If a client attemtps to start a new connection with unsupported version,
a version negotiation packet is sent that contains a list of supported
versions (currently this is a single version, selected at compile time).
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The function ngx_http_upstream_check_broken_connection() terminates the HTTP/1
request if client sends eof. For QUIC (including HTTP/3) the c->write->error
flag is now checked instead. This flag is set when the entire QUIC connection
is closed or STOP_SENDING was received from client.
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Previously the request body DATA frame header was read by one byte because
filters were called only when the requested number of bytes were read. Now,
after 08ff2e10ae92 (1.19.2), filters are called after each read. More bytes
can be read at once, which simplifies and optimizes the code.
This also reduces diff with the default branch.
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This field is served as a simple counter for PTO backoff.
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This interacts badly with retransmissions of lost packets
and can provoke spurious client retransmits.
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Previously, such packets weren't handled as the resulting zero remaining time
prevented setting the loss detection timer, which, instead, could be disarmed.
For implementation details, see quic-recovery draft 29, appendix A.10.
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The PTO handler is split into separate PTO and loss detection handlers
that operate interchangeably depending on which timer should be set.
The present ngx_quic_lost_handler is now only used for packet loss detection.
It replaces ngx_quic_pto_handler if there are packets preceeding largest_ack.
Once there is no more such packets, ngx_quic_pto_handler is installed again.
Probes carry unacknowledged data previously sent in the oldest packet number,
one per each packet number space. That is, it could be up to two probes.
PTO backoff is now increased before scheduling next probes.
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In particular, this prevents declaring packet number 0 as lost if
there aren't yet any acknowledgements in this packet number space.
For example, only Initial packets were acknowledged in handshake.
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Previously a single STREAM frame was created for each buffer in stream output
chain which is wasteful with respect to memory. The following changes were
made in the stream send code:
- ngx_quic_stream_send_chain() no longer calls ngx_quic_stream_send() and got
a separate implementation that coalesces neighbouring buffers into a single
frame
- the new ngx_quic_stream_send_chain() respects the limit argument, which fixes
sendfile_max_chunk and limit_rate
- ngx_quic_stream_send() is reimplemented to call ngx_quic_stream_send_chain()
- stream frame size limit is moved out to a separate function
ngx_quic_max_stream_frame()
- flow control is moved out to a separate function ngx_quic_max_stream_flow()
- ngx_quic_stream_send_chain() is relocated next to ngx_quic_stream_send()
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A packet size is kept in one of the frames belonging to the packet.
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This applies to discarding Initial and Handshake keys.
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For RESET_STREAM the c->read->error flag is set.
For STOP_SENDING the c->write->error flag is set.
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Creating client-initiated streams is moved from ngx_quic_handle_stream_frame()
to a separate function ngx_quic_create_client_stream(). This function is
responsible for creating streams with lower ids as well.
Also, simplified and fixed initial data buffering in
ngx_quic_handle_stream_frame(). It is now done before calling the initial
handler as the handler can destroy the stream.
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Previously this function generated an error trying to figure out if client shut
down the write end of the connection. The reason for this error was that a
QUIC stream has no socket descriptor. However checking for eof is not the
right thing to do for an HTTP/3 QUIC stream since HTTP/3 clients are expected
to shut down the write end of the stream after sending the request.
Now the function handles QUIC streams separately. It checks if c->read->error
is set. The error flags for c->read and c->write are now set for all streams
when closing the QUIC connection instead of setting the pending_eof flag.
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According to quic-transport draft 29, section 19.3.1:
The value of the Gap field establishes the largest packet number
value for the subsequent ACK Range using the following formula:
largest = previous_smallest - gap - 2
Thus, given a largest packet number for the range, the smallest value
is determined by the formula:
smallest = largest - ack_range
While here, changed min/max to uint64_t for consistency.
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A QUIC stream could be destroyed by handler while in ngx_quic_stream_input().
To detect this, ngx_quic_find_stream() is used to check that it still exists.
Previously, a stream id was passed to this routine off the frame structure.
In case of stream cleanup, it is freed along with other frames belonging to
the stream on cleanup. Then, a cleanup handler reuses last frames to update
MAX_STREAMS and serve other purpose. Thus, ngx_quic_find_stream() is passed
a reused frame with zeroed out part pointed by stream_id. If a stream with
id 0x0 still exists, this leads to use-after-free.
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New directives are added:
- http3_max_concurrent_pushes
- http3_push
- http3_push_preload
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The limits on active bidi and uni client streams are maintained at their
initial values initial_max_streams_bidi and initial_max_streams_uni by sending
a MAX_STREAMS frame upon each client stream closure.
Also, the following is changed for data arriving to non-existing streams:
- if a stream was already closed, such data is ignored
- when creating a new stream, all streams of the same type with lower ids are
created too
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Also, ngx_quic_create_uni_stream() is replaced with
ngx_quic_open_stream() which is capable of creating a bidi stream.
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Now it holds "HTTP/3.0". Previously it was empty.
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Plus a few other minor style changes.
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Now they are similar to HTTP/2 where they are called h2scf.
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The file contains only encoding functions.
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Even though typically frame ids fit into a single byte, calling
ngx_http_v3_encode_varlen_int() adds to the code clarity.
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The ngx_http_perl_module module doesn't have a notion of including additional
search paths through --with-cc-opt, which results in compile error incomplete
type 'enum ssl_encryption_level_t' when building nginx without QUIC support.
The enum is visible from quic event headers and eventually pollutes ngx_core.h.
The fix is to limit including headers to compile units that are real consumers.
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Previously, this triggered an alert "shutdown() failed" in error log.
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Now c->listening->handler() is called instead.
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Also, introduced ngx_stream_quic_module.
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The parameter allows processing HTTP/0.9-2 over QUIC.
Also, introduced ngx_http_quic_module and moved QUIC settings there
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The right protocol is selected by the HTTP code. In the QUIC code only verify
that some protocol was selected and trigger an error otherwise.
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Previously, the main connection log was there. Now it's the stream connection
log.
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According to quic-transport draft 29, section 21.12.1.1:
Prior to validation, endpoints are limited in what they are able to
send. During the handshake, a server cannot send more than three
times the data it receives; clients that initiate new connections or
migrate to a new network path are limited.
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The ngx_quic_queue_frame() functions puts a frame into send queue and
schedules a push timer to actually send data.
The patch adds tracking for data amount in the queue and sends data
immediately if amount of data exceeds limit.
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Instead of timer-based retransmissions with constant packet lifetime,
this patch implements ack-based loss detection and probe timeout
for the cases, when no ack is received, according to the quic-recovery
draft 29.
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Instead of returning NGX_DONE/NGX_OK, the function now itself moves
passed frames range into sent queue and sets PTO timer if required.
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The c->quic->retransmit timer is now called "pto".
The ngx_quic_retransmit() function is renamed to "ngx_quic_detect_lost()".
This is a preparation for the following patches.
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