| Commit message (Collapse) | Author | Age |
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As per quic-transport-34:
An endpoint also restarts its idle timer when sending an ack-eliciting
packet if no other ack-eliciting packets have been sent since last receiving
and processing a packet.
Previously, the timer was set for any packet.
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The limit is the size of all large client header buffers. Client header size
is the total size of all client header names and values.
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The structure is used to parse an HTTP/3 request. An object of this type is
added to ngx_http_request_t instead of h3_parse generic pointer.
Also, the new field is located outside of the request ephemeral zone to keep it
safe after request headers are parsed.
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Instead, size of one large_client_header_buffers buffer is used.
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Parameters sent by client are verified and defaults are set for parameters
omitted by client.
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The "max_ack_delay", "ack_delay_exponent", and "max_udp_payload_size"
transport parameters were not communicated to client.
The "disable_active_migration" and "active_connection_id_limit"
parameters were not saved into zero-rtt context.
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18.1. Reserved Transport Parameters
Transport parameters with an identifier of the form "31 * N + 27" for
integer values of N are reserved to exercise the requirement that
unknown transport parameters be ignored. These transport parameters
have no semantics, and can carry arbitrary values.
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Two PING frames are sent per level that generate two UDP datagrams.
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Setting the timer is brought into compliance with quic-recovery-34. Now it's
set from a single function ngx_quic_set_lost_timer() that takes into account
both loss detection and PTO. The following issues are fixed with this change:
- when in loss detection mode, discarding a context could turn off the
timer forever after switching to the PTO mode
- when in loss detection mode, sending a packet resulted in rescheduling the
timer as if it's always in the PTO mode
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As per quic-transport-33:
An endpoint MUST acknowledge all ack-eliciting Initial and Handshake
packets immediately
If a packet carrying Initial or Handshake ACK was lost, a non-immediate ACK
should not be sent later. Instead, client is expected to send a new packet
to acknowledge.
Sending non-immediate ACKs for Initial packets can cause the client to
generate an inflated RTT sample.
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Previously, the wrong end pointer was used, which could lead to errors
"quic failed to parse ack frame gap".
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The token generation in QUIC is reworked. Single host key is used to generate
all required keys of needed sizes using HKDF.
The "quic_stateless_reset_token_key" directive is removed. Instead, the
"quic_host_key" directive is used, which reads key from file, or sets it
to random bytes if not specified.
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Previously, client one was used.
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The flag was introduced to create type-aware CONNECTION_CLOSE frames,
and now is replaced with frame type information, directly accessible.
Notably, this fixes type logging for received frames in b3d9e57d0f62.
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The flag is used in ngx_http_finalize_connection() to switch client connection
to the keepalive mode. Since eaea7dac3292 this code is not executed for HTTP/3
which allows us to revert the change and get back to the default branch code.
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The change reduces diff to the default branch for
src/http/ngx_http_request_body.c.
Also, client Content-Length, if present, is now checked against the real body
size sent by client.
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Previously, if an unexpected packet was received on an existing QUIC
connection, stateless reset token was neither recognized nor sent.
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- split ngx_quic_process_packet() in two functions with the second one called
ngx_quic_process_payload() in charge of decrypring and handling the payload
- renamed ngx_quic_payload_handler() to ngx_quic_handle_frames()
- moved error cleanup from ngx_quic_input() to ngx_quic_process_payload()
- moved handling closed connection from ngx_quic_handle_frames() to
ngx_quic_process_payload()
- minor fixes
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Previously, quic connection object was created when Retry packet was sent.
This is neither necessary nor convenient, and contradicts the idea of retry:
protecting from bad clients and saving server resources.
Now, the connection is not created, token is verified cryptographically
instead of holding it in connection.
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This function should be called at the end of an event handler to prepare the
event for the next handler call. Particularly, the "active" flag is set or
cleared depending on data availability.
With this call missing in one code path, read handler was not called again
after handling the initial part of the client request, if the request was too
big to fit into a single STREAM frame.
Now ngx_handle_read_event() is called in this code path. Also, read timer is
restarted.
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The ngx_http_set_lingering_close() function is not called for HTTP/3.
The change reduces diff to the default branch.
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A header with the name containing null, CR, LF, colon or uppercase characters,
is now considered an error. A header with the value containing null, CR or LF,
is also considered an error.
Also, header is considered invalid unless its name only contains lowercase
characters, digits, minus and optionally underscore. Such header can be
optionally ignored.
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- :method, :path and :scheme are expected exactly once and not empty
- :method and :scheme character validation is added
- :authority cannot appear more than once
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The change reduces diff to the default branch for
src/http/ngx_http_request.c and src/http/ngx_http_parse.c.
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Notably, the version negotiation table is updated to reject draft-33/QUICv1
(which requires a new TLS codepoint) unless explicitly asked to built with.
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The quic kernel bpf helper inspects packet payload for DCID, extracts key
and routes the packet into socket matching the key.
Due to reuseport feature, each worker owns a personal socket, which is
identified by the same key, used to create DCID.
BPF objects are locked in RAM and are subject to RLIMIT_MEMLOCK.
The "ulimit -l" command may be used to setup proper limits, if maps
cannot be created with EPERM or updated with ETOOLONG.
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It contains wrappers for operations with BPF maps and for loading BPF programs.
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The low-level API was used in early QUIC development.
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The <openssl/kdf.h> header is available since OpenSSL 1.1.0, and HKDF API
used for separate Extract and Expand steps in TLSv1.3 - since OpenSSL 1.1.1.
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This API is available in BoringSSL for quite some time:
https://boringssl.googlesource.com/boringssl/+/3743aaf
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Previously, when processing client ACK, rtt could be calculated for a packet
different than the largest if it was missing in the sent chain. Even though
this is an unlikely situation, rtt based on a different packet could be larger
than needed leading to bigger pto timeout and performance degradation.
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Previously, this only worked for Application level because before
quic-transport-30, there were the following constraints:
Because the receiver doesn't use the ACK Delay for Initial and Handshake
packets, a sender SHOULD send a value of 0.
When adjusting an RTT sample using peer-reported acknowledgement delays, an
endpoint ... MUST ignore the ACK Delay field of the ACK frame for packets
sent in the Initial and Handshake packet number space.
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Previously, server max_ack_delay was used which is wrong.
Also, level check is simplified.
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To speed up handshake, resend both initial and handshake packets if there's
at least one unacknowledged initial packet.
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Missing flag prevented frame data from being copied as the buffer was not
considered a memory buffer.
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