| Commit message (Collapse) | Author | Age |
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To minimize difference with the following changes.
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According to the quic-recovery 29, Section 5: Estimating the Round-Trip Time.
Currently, integer arithmetics is used, which loses sub-millisecond accuracy.
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This makes calling this function similar to other parse functions.
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Previously, the expression (ch & 0x7f) was promoted to a signed integer.
Depending on the platform, the size of this integer could be less than 8 bytes,
leading to overflow when handling the higher bits of the result. Also, sign
bit of this integer could be replicated when adding to the 64-bit st->value.
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Previously it was set when creating the request object. The side-effect was
trying to discard the request body in case of header parse error.
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Previously errors led only to closing streams.
To simplify closing QUIC connection from a QUIC stream context, new macro
ngx_http_v3_finalize_connection() is introduced. It calls
ngx_quic_finalize_connection() for the parent connection.
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The function finalizes QUIC connection with an application protocol error
code and sends a CONNECTION_CLOSE frame with type=0x1d.
Also, renamed NGX_QUIC_FT_CONNECTION_CLOSE2 to NGX_QUIC_FT_CONNECTION_CLOSE_APP.
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Now it's similar to HTTP/2.
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Previously dynamic table was not functional because of zero limit on its size
set by default. Now the following changes enable it:
- new directives to set SETTINGS_QPACK_MAX_TABLE_CAPACITY and
SETTINGS_QPACK_BLOCKED_STREAMS
- send settings with SETTINGS_QPACK_MAX_TABLE_CAPACITY and
SETTINGS_QPACK_BLOCKED_STREAMS to the client
- send Insert Count Increment to the client
- send Header Acknowledgement to the client
- evict old dynamic table entries on overflow
- decode Required Insert Count from client
- block stream if Required Insert Count is not reached
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Previously bytes were ordered from MSB to LSB, but the right order is the
reverse.
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Client streams may send literal strings which are now limited in size by the
new directive. The default value is 4096.
The directive is similar to HTTP/2 directive http2_max_field_size.
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The macro helps to access a module's server configuration from a QUIC
stream context.
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This resulted in the frame error due to the invalid DATA frame length.
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See sections 5.2 and 5.8 for the current values.
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So that connections are protected from failing from on-path attacks.
Decryption failure of long packets used during handshake still leads
to connection close since it barely makes sense to handle them there.
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A previously used undefined error code is now replaced with the generic one.
Note that quic-transport prescribes keeping connection intact, discarding such
QUIC packets individually, in the sense that coalesced packets could be there.
This is selectively handled in the next change.
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That way it makes more sense. Previously it was closed with INTERNAL_ERROR.
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This breaks graceful shutdown of QUIC connections in terms of quic-transport.
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The patch removes remnants of the old state tracking mechanism, which did
not take into account assimetry of read/write states and was not very
useful.
The encryption state now is entirely tracked using SSL_quic_read/write_level().
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quic-transport draft 29:
section 7:
* authenticated negotiation of an application protocol (TLS uses
ALPN [RFC7301] for this purpose)
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Endpoints MUST explicitly negotiate an application protocol. This
avoids situations where there is a disagreement about the protocol
that is in use.
section 8.1:
When using ALPN, endpoints MUST immediately close a connection (see
Section 10.3 of [QUIC-TRANSPORT]) with a no_application_protocol TLS
alert (QUIC error code 0x178; see Section 4.10) if an application
protocol is not negotiated.
Changes in ngx_quic_close_quic() function are required to avoid attempts
to generated and send packets without proper keys, what happens in case
of failed ALPN check.
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The ctx->pnum is incremented after the packet is sent, thus pointing to the
next packet number, which should not be used in comparison.
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quic-transport draft 29, section 14:
QUIC depends upon a minimum IP packet size of at least 1280 bytes.
This is the IPv6 minimum size [RFC8200] and is also supported by most
modern IPv4 networks. Assuming the minimum IP header size, this
results in a QUIC maximum packet size of 1232 bytes for IPv6 and 1252
bytes for IPv4.
Since the packet size can change during connection lifetime, the
ngx_quic_max_udp_payload() function is introduced that currently
returns minimal allowed size, depending on address family.
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quic-tls, 8.2:
The quic_transport_parameters extension is carried in the ClientHello
and the EncryptedExtensions messages during the handshake. Endpoints
MUST send the quic_transport_parameters extension; endpoints that
receive ClientHello or EncryptedExtensions messages without the
quic_transport_parameters extension MUST close the connection with an
error of type 0x16d (equivalent to a fatal TLS missing_extension
alert, see Section 4.10).
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A posted event need to be deleted during the connection close.
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This allows to avoid problems with packet fragmentation in real networks.
This is a temporary workaround.
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This is a temporary workaround, proper retransmission mechanism based on
quic-recovery rfc draft is yet to be implemented.
Currently hardcoded value is too small for real networks. The patch
sets static PTO, considering rtt of ~333ms, what gives about 1s.
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Previously an error was triggered for HTTP/2 when host with port was passed
by client.
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Recently BoringSSL introduced SSL_set_quic_early_data_context()
that serves as an additional constrain to enable 0-RTT in QUIC.
Relevant changes:
* https://boringssl.googlesource.com/boringssl/+/7c52299%5E!/
* https://boringssl.googlesource.com/boringssl/+/8519432%5E!/
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Previously, the retry transport parameter was sent regardless.
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