1661 bug fix raw diff viewer #6
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In preparation for allowing IP server names (with rustls 0.23).
Co-authored-by: gabrik <[email protected]>
Signed-off-by: gabrik <[email protected]>
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Retry source CIDs are under our control and are already required to be unpredictable, so they make a fine basis for key derivation.
Allows multiple tasks to concurrently wait for writability on the same socket. See the [tokio] and [async-io] docs for details. [tokio]: https://docs.rs/tokio/latest/tokio/net/struct.UdpSocket.html [async-io]: https://docs.rs/async-io/latest/async_io/struct.Async.html#concurrent-io
Dropping these has low cost because they're not associated with any connection.
`UdpState` was removed some time ago, and various other interface details have changed. As a result, the build would fail on platforms without native support.
As we no longer buffer multiple transmits in memory, this complexity is unused. GSO is expected to account for most, if not all, of the performance benefit.
Because we no longer buffer transmits for unpredictable periods, there's no need to share ownership of their contents.
This didn't impact any tests, but was confusing.
We no longer need to share ownership of this memory, so we should use a simpler type to reflect our simpler requirements.
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Closes quinn-rs#1820 The fix: - Endpoint now maintains a slab with an entry for each pending Incoming to buffer received data. - ConnectionIndex now maps initial DCID to that slab key immediately upon construction of Incoming. - If Incoming is accepted, association is overridden with association with ConnectionHandle, and all buffered datagrams are fed to newly constructed Connection. - If Incoming is refused/retried/ignored, or accepting errors, association and slab entry are cleaned up to prevent memory leak. Additional considerations: - The Incoming::ignore operation can no longer be implemented as just dropping it. To help prevent incorrect API usage, proto::Incoming is modified to log a warning if it is dropped without being passed to Endpoint::accept/refuse/retry/ignore. - Three things protect against memory exhaustion attacks here: 1. The MAX_INCOMING_CONNECTIONS limit is moved from quinn to proto, limiting the number of concurrent incoming connections for which datagrams will be buffered before the application decides what to do with them. Also, it is changed from a constant to a field of the server config, max_incoming. 2. Per-incoming buffered data is limited to a new limit stored in the server config, incoming_buffer_size, beyond which subsequent packets are discarded if received in these conditions. 3. The sum total of all incoming buffered data is limited to a new limit stored in the server config, incoming_buffer_size_total, beyond which subsequent packets are discarded if received in these conditions.
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