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Summary:
Write the new ACK_EXTENDED frame. When any of the ACK_EXTENDED features are enabled locally and supported by the peer, this frame type will take precedence over ACK_ECN and ACK_RECEIVETIMESTAMPS. See first diff in the stack for the features.
Frame 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: D68931148
fbshipit-source-id: 0fb4bac23e121f82a11602daabc1ec7084db43dd
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