| cmsg |
|
|
| fallback.rs |
|
2764 |
| lib.rs |
Uniform interface to send and receive UDP packets with advanced features useful for QUIC
This crate exposes kernel UDP stack features available on most modern systems which are required
for an efficient and conformant QUIC implementation. As of this writing, these are not available
in std or major async runtimes, and their niche character and complexity are a barrier to adding
them. Hence, a dedicated crate.
Exposed features include:
- Segmentation offload for bulk send and receive operations, reducing CPU load.
- Reporting the exact destination address of received packets and specifying explicit source
addresses for sent packets, allowing responses to be sent from the address that the peer
expects when there are multiple possibilities. This is common when bound to a wildcard address
in IPv6 due to [RFC 8981] temporary addresses.
- [Explicit Congestion Notification], which is required by QUIC to prevent packet loss and reduce
latency on congested links when supported by the network path.
- Disabled IP-layer fragmentation, which allows the true physical MTU to be detected and reduces
risk of QUIC packet loss.
Some features are unavailable in some environments. This can be due to an outdated operating
system or drivers. Some operating systems may not implement desired features at all, or may not
yet be supported by the crate. When support is unavailable, functionality will gracefully
degrade.
[RFC 8981]: https://www.rfc-editor.org/rfc/rfc8981.html
[Explicit Congestion Notification]: https://www.rfc-editor.org/rfc/rfc3168.html |
6826 |
| unix.rs |
|
30214 |
| windows.rs |
|
16087 |