Summary:
This introduces a new frame type for acks (ACK_EXTENDED) that can carry optional fields depending on the features supported by the peer. The currently supported features set will include ECN count fields, and Receive Timstamp fields. This enables a quic connection to report both ECN counts and receive timestamps, which is not possible otherwise because they use different frame types.
Support for the extended ack as well as the set of features that can be included in it is negotiated through a new transport parameter (extended_ack_supported = 0xff0a004). Its value indicates which features are supported by the local transport. The value is an integer which is evaluated against the following bitmasks:
```
ECN_COUNTS = 0x01,
RECEIVE_TIMESTAMPS = 0x02,
```
This diff introduces the transport parameter and negotiates the supported features between the peers of the connection. The parameter is cached in the psk cache so the client can remember the server config. It is also encoded inside the 0-rtt ticket so the server can reject it if its local config has changed.
The following diffs add reading and writing the frame itself.
The ACK_EXTENDED frame itself will have the following format
```
ACK_EXTENDED Frame {
Type (i) = 0xB1
// Fields of the existing ACK (type=0x02) frame:
Largest Acknowledged (i),
ACK Delay (i),
ACK Range Count (i),
First ACK Range (i),
ACK Range (..) ...,
Extended Ack Features (i),
// Optional ECN counts (if bit 0 is set in Features)
[ECN Counts (..)],
// Optional Receive Timestamps (if bit 1 is set in Features)
[Receive Timestamps (..)]
}
// Fields from the existing ACK_ECN frame
ECN Counts {
ECT0 Count (i),
ECT1 Count (i),
ECN-CE Count (i),
}
// Fields from the existing ACK_RECEIVE_TIMESTAMPS frame
Receive Timestamps {
Timestamp Range Count (i),
Timestamp Ranges (..) ...,
}
Timestamp Range {
Gap (i),
Timestamp Delta Count (i),
Timestamp Delta (i) ...,
}
```
Reviewed By: sharmafb
Differential Revision: D68931151
fbshipit-source-id: 44c8c83d2f434abca97c4e85f0fa7502736cddc1
Summary:
All according to plan: https://fburl.com/gdoc/pebccgi1
Changing function definitions to return errors while still throwing.
Reviewed By: sharmafb
Differential Revision: D69567329
fbshipit-source-id: 5d40ee32fe185d5674785632a9a13e4cef996988
Summary: For now, we're going to throw an exception when we get a RESET_STREAM_AT frame, which would terminate the connection. Later on, this logic is going to be gated on whether we and the peer support reliable resets (and we get to know this through the transport parameters).
Reviewed By: jbeshay
Differential Revision: D67866393
fbshipit-source-id: 6b2888c026fadf0f2aa5dad52314ed8250959cf6
Summary: This diff adds the reliable_stream_reset transport parameter to mvfst.
Reviewed By: hanidamlaj
Differential Revision: D65383676
fbshipit-source-id: cb2f6a1a90004ea489447b67ed3cfc12ca90b804
Summary:
With normal resets, we transition from `StreamSendState::ResetSent` to `StreamSendState::Closed` when we get an ACK for a RESET_STREAM frame.
With reliable resets, this is going to be a little more complicated. We can't automatically transition from `StreamSendState::ResetSent` to `StreamSendState::Closed` when we get an ACK for a RESET_STREAM_AT frame because it's possible that the peer hasn't yet received all data until the reliable reset offset.
My idea is the following: Keep track of the `minReliableSizeAcked`, which is the lowest value of the reliable size in any RESET_STREAM_AT frame that was ACKed by the peer. We set it to 0 if a RESET_STREAM frame was ACKed by the peer.
Then, we can transition from `StreamSendState::ResetSent` to `StreamSendState::Closed` if any one of the following two events happen:
* We get an ACK for a RESET_STREAM_AT or a RESET_STREAM frame, and all data until the `minReliableSizeAcked` has been ACKed by the peer.
* We get an ACK for stream data, and this puts us in a state where all data until the `minReliableSizeAcked` has been ACKed by the peer.
Note: This diff doesn't have any functional change. The only change is that we're keeping track of the `minReliableSizeAcked`, but aren't using it anywhere.
Reviewed By: mjoras
Differential Revision: D66781199
fbshipit-source-id: 2aa5138a18f70e9801e59e747460558ba706939c
