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chore: checkpoint before Python removal

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Sienna Meridian Satterwhite
2026-03-26 22:33:59 +00:00
parent 683cec9307
commit e568ddf82a
29972 changed files with 11269302 additions and 2 deletions
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"windows-link",
"windows_aarch64_gnullvm 0.53.0",
"windows_aarch64_msvc 0.53.0",
"windows_i686_gnu 0.53.0",
"windows_i686_gnullvm 0.53.0",
"windows_i686_msvc 0.53.0",
"windows_x86_64_gnu 0.53.0",
"windows_x86_64_gnullvm 0.53.0",
"windows_x86_64_msvc 0.53.0",
]
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101
vendor/quinn-udp/Cargo.toml vendored Normal file
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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2021"
rust-version = "1.74.1"
name = "quinn-udp"
version = "0.5.14"
build = "build.rs"
autolib = false
autobins = false
autoexamples = false
autotests = false
autobenches = false
description = "UDP sockets with ECN information for the QUIC transport protocol"
readme = false
keywords = ["quic"]
categories = [
"network-programming",
"asynchronous",
]
license = "MIT OR Apache-2.0"
repository = "https://github.com/quinn-rs/quinn"
[package.metadata.docs.rs]
all-features = true
[features]
default = [
"tracing",
"log",
]
direct-log = ["dep:log"]
fast-apple-datapath = []
log = ["tracing/log"]
[lib]
name = "quinn_udp"
path = "src/lib.rs"
bench = false
[[test]]
name = "tests"
path = "tests/tests.rs"
[[bench]]
name = "throughput"
path = "benches/throughput.rs"
harness = false
[dependencies.libc]
version = "0.2.158"
[dependencies.log]
version = "0.4"
optional = true
[dependencies.tracing]
version = "0.1.10"
features = ["std"]
optional = true
default-features = false
[dev-dependencies.criterion]
version = "0.7"
features = ["async_tokio"]
default-features = false
[dev-dependencies.tokio]
version = "1.28.1"
features = [
"sync",
"rt",
"rt-multi-thread",
"net",
]
[build-dependencies.cfg_aliases]
version = "0.2"
[target.'cfg(not(all(target_family = "wasm", target_os = "unknown")))'.dependencies.socket2]
version = ">=0.5, <0.7"
[target."cfg(windows)".dependencies.once_cell]
version = "1.19"
[target."cfg(windows)".dependencies.windows-sys]
version = ">=0.52, <=0.60"
features = [
"Win32_Foundation",
"Win32_System_IO",
"Win32_Networking_WinSock",
]

201
vendor/quinn-udp/LICENSE-APACHE vendored Normal file
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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7
vendor/quinn-udp/LICENSE-MIT vendored Normal file
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Copyright (c) 2018 The quinn Developers
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

127
vendor/quinn-udp/benches/throughput.rs vendored Normal file
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use std::{
cmp::min,
io::{ErrorKind, IoSliceMut},
net::{Ipv4Addr, Ipv6Addr, UdpSocket},
};
use criterion::{Criterion, criterion_group, criterion_main};
use tokio::{io::Interest, runtime::Runtime};
use quinn_udp::{BATCH_SIZE, RecvMeta, Transmit, UdpSocketState};
pub fn criterion_benchmark(c: &mut Criterion) {
const TOTAL_BYTES: usize = 10 * 1024 * 1024;
const SEGMENT_SIZE: usize = 1280;
let rt = Runtime::new().unwrap();
let _guard = rt.enter();
let (send_state, send_socket) = new_socket();
let (recv_state, recv_socket) = new_socket();
let dst_addr = recv_socket.local_addr().unwrap();
let mut permutations = vec![];
for gso_enabled in [
false,
#[cfg(any(target_os = "linux", target_os = "windows", apple))]
true,
] {
for gro_enabled in [false, true] {
#[cfg(target_os = "windows")]
if gso_enabled && !gro_enabled {
// Windows requires receive buffer to fit entire datagram on GRO
// enabled socket.
//
// OS error: "A message sent on a datagram socket was larger
// than the internal message buffer or some other network limit,
// or the buffer used to receive a datagram into was smaller
// than the datagram itself."
continue;
}
for recvmmsg_enabled in [false, true] {
permutations.push((gso_enabled, gro_enabled, recvmmsg_enabled));
}
}
}
for (gso_enabled, gro_enabled, recvmmsg_enabled) in permutations {
let mut group = c.benchmark_group(format!(
"gso_{gso_enabled}_gro_{gro_enabled}_recvmmsg_{recvmmsg_enabled}"
));
group.throughput(criterion::Throughput::Bytes(TOTAL_BYTES as u64));
let gso_segments = if gso_enabled {
send_state.max_gso_segments()
} else {
1
};
let msg = vec![0xAB; min(MAX_DATAGRAM_SIZE, SEGMENT_SIZE * gso_segments)];
let transmit = Transmit {
destination: dst_addr,
ecn: None,
contents: &msg,
segment_size: gso_enabled.then_some(SEGMENT_SIZE),
src_ip: None,
};
let gro_segments = if gro_enabled {
recv_state.gro_segments()
} else {
1
};
let batch_size = if recvmmsg_enabled { BATCH_SIZE } else { 1 };
group.bench_function("throughput", |b| {
b.to_async(&rt).iter(|| async {
let mut receive_buffers = vec![vec![0; SEGMENT_SIZE * gro_segments]; batch_size];
let mut receive_slices = receive_buffers
.iter_mut()
.map(|buf| IoSliceMut::new(buf))
.collect::<Vec<_>>();
let mut meta = vec![RecvMeta::default(); batch_size];
let mut sent: usize = 0;
let mut received: usize = 0;
while sent < TOTAL_BYTES {
send_socket.writable().await.unwrap();
send_socket
.try_io(Interest::WRITABLE, || {
send_state.send((&send_socket).into(), &transmit)
})
.unwrap();
sent += transmit.contents.len();
while received < sent {
recv_socket.readable().await.unwrap();
let n = match recv_socket.try_io(Interest::READABLE, || {
recv_state.recv((&recv_socket).into(), &mut receive_slices, &mut meta)
}) {
Ok(n) => n,
// recv.readable() can lead to false positives. Try again.
Err(e) if e.kind() == ErrorKind::WouldBlock => continue,
e => e.unwrap(),
};
received += meta.iter().map(|m| m.len).take(n).sum::<usize>();
}
}
})
});
}
}
fn new_socket() -> (UdpSocketState, tokio::net::UdpSocket) {
let socket = UdpSocket::bind((Ipv6Addr::LOCALHOST, 0))
.or_else(|_| UdpSocket::bind((Ipv4Addr::LOCALHOST, 0)))
.unwrap();
(
UdpSocketState::new((&socket).into()).unwrap(),
tokio::net::UdpSocket::from_std(socket).unwrap(),
)
}
criterion_group!(benches, criterion_benchmark);
criterion_main!(benches);
const MAX_IP_UDP_HEADER_SIZE: usize = 48;
const MAX_DATAGRAM_SIZE: usize = u16::MAX as usize - MAX_IP_UDP_HEADER_SIZE;

33
vendor/quinn-udp/build.rs vendored Normal file
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use cfg_aliases::cfg_aliases;
fn main() {
// Setup cfg aliases
cfg_aliases! {
// Platforms
apple: {
any(
target_os = "macos",
target_os = "ios",
target_os = "tvos",
target_os = "visionos"
)
},
bsd: {
any(
target_os = "freebsd",
target_os = "openbsd",
target_os = "netbsd"
)
},
solarish: {
any(
target_os = "solaris",
target_os = "illumos"
)
},
// Convenience aliases
apple_fast: { all(apple, feature = "fast-apple-datapath") },
apple_slow: { all(apple, not(feature = "fast-apple-datapath")) },
wasm_browser: { all(target_family = "wasm", target_os = "unknown") },
}
}

157
vendor/quinn-udp/src/cmsg/mod.rs vendored Normal file
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use std::{
ffi::{c_int, c_uchar},
mem, ptr,
};
#[cfg(unix)]
#[path = "unix.rs"]
mod imp;
#[cfg(windows)]
#[path = "windows.rs"]
mod imp;
pub(crate) use imp::Aligned;
/// Helper to encode a series of control messages (native "cmsgs") to a buffer for use in `sendmsg`
// like API.
///
/// The operation must be "finished" for the native msghdr to be usable, either by calling `finish`
/// explicitly or by dropping the `Encoder`.
pub(crate) struct Encoder<'a, M: MsgHdr> {
hdr: &'a mut M,
cmsg: Option<&'a mut M::ControlMessage>,
len: usize,
}
impl<'a, M: MsgHdr> Encoder<'a, M> {
/// # Safety
/// - `hdr` must contain a suitably aligned pointer to a big enough buffer to hold control messages
/// bytes. All bytes of this buffer can be safely written.
/// - The `Encoder` must be dropped before `hdr` is passed to a system call, and must not be leaked.
pub(crate) unsafe fn new(hdr: &'a mut M) -> Self {
Self {
cmsg: hdr.cmsg_first_hdr().as_mut(),
hdr,
len: 0,
}
}
/// Append a control message to the buffer.
///
/// # Panics
/// - If insufficient buffer space remains.
/// - If `T` has stricter alignment requirements than `M::ControlMessage`
pub(crate) fn push<T: Copy>(&mut self, level: c_int, ty: c_int, value: T) {
assert!(mem::align_of::<T>() <= mem::align_of::<M::ControlMessage>());
let space = M::ControlMessage::cmsg_space(mem::size_of_val(&value));
assert!(
self.hdr.control_len() >= self.len + space,
"control message buffer too small. Required: {}, Available: {}",
self.len + space,
self.hdr.control_len()
);
let cmsg = self.cmsg.take().expect("no control buffer space remaining");
cmsg.set(
level,
ty,
M::ControlMessage::cmsg_len(mem::size_of_val(&value)),
);
unsafe {
ptr::write(cmsg.cmsg_data() as *const T as *mut T, value);
}
self.len += space;
self.cmsg = unsafe { self.hdr.cmsg_nxt_hdr(cmsg).as_mut() };
}
/// Finishes appending control messages to the buffer
pub(crate) fn finish(self) {
// Delegates to the `Drop` impl
}
}
// Statically guarantees that the encoding operation is "finished" before the control buffer is read
// by `sendmsg` like API.
impl<M: MsgHdr> Drop for Encoder<'_, M> {
fn drop(&mut self) {
self.hdr.set_control_len(self.len as _);
}
}
/// # Safety
///
/// `cmsg` must refer to a native cmsg containing a payload of type `T`
pub(crate) unsafe fn decode<T: Copy, C: CMsgHdr>(cmsg: &impl CMsgHdr) -> T {
assert!(mem::align_of::<T>() <= mem::align_of::<C>());
debug_assert_eq!(cmsg.len(), C::cmsg_len(mem::size_of::<T>()));
ptr::read(cmsg.cmsg_data() as *const T)
}
pub(crate) struct Iter<'a, M: MsgHdr> {
hdr: &'a M,
cmsg: Option<&'a M::ControlMessage>,
}
impl<'a, M: MsgHdr> Iter<'a, M> {
/// # Safety
///
/// `hdr` must hold a pointer to memory outliving `'a` which can be soundly read for the
/// lifetime of the constructed `Iter` and contains a buffer of native cmsgs, i.e. is aligned
// for native `cmsghdr`, is fully initialized, and has correct internal links.
pub(crate) unsafe fn new(hdr: &'a M) -> Self {
Self {
hdr,
cmsg: hdr.cmsg_first_hdr().as_ref(),
}
}
}
impl<'a, M: MsgHdr> Iterator for Iter<'a, M> {
type Item = &'a M::ControlMessage;
fn next(&mut self) -> Option<Self::Item> {
let current = self.cmsg.take()?;
self.cmsg = unsafe { self.hdr.cmsg_nxt_hdr(current).as_ref() };
#[cfg(apple_fast)]
{
// On MacOS < 14 CMSG_NXTHDR might continuously return a zeroed cmsg. In
// such case, return `None` instead, thus indicating the end of
// the cmsghdr chain.
if current.len() < mem::size_of::<M::ControlMessage>() {
return None;
}
}
Some(current)
}
}
// Helper traits for native types for control messages
pub(crate) trait MsgHdr {
type ControlMessage: CMsgHdr;
fn cmsg_first_hdr(&self) -> *mut Self::ControlMessage;
fn cmsg_nxt_hdr(&self, cmsg: &Self::ControlMessage) -> *mut Self::ControlMessage;
/// Sets the number of control messages added to this `struct msghdr`.
///
/// Note that this is a destructive operation and should only be done as a finalisation
/// step.
fn set_control_len(&mut self, len: usize);
fn control_len(&self) -> usize;
}
pub(crate) trait CMsgHdr {
fn cmsg_len(length: usize) -> usize;
fn cmsg_space(length: usize) -> usize;
fn cmsg_data(&self) -> *mut c_uchar;
fn set(&mut self, level: c_int, ty: c_int, len: usize);
fn len(&self) -> usize;
}

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use std::ffi::{c_int, c_uchar};
use super::{CMsgHdr, MsgHdr};
#[derive(Copy, Clone)]
#[repr(align(8))] // Conservative bound for align_of<libc::cmsghdr>
pub(crate) struct Aligned<T>(pub(crate) T);
/// Helpers for [`libc::msghdr`]
impl MsgHdr for libc::msghdr {
type ControlMessage = libc::cmsghdr;
fn cmsg_first_hdr(&self) -> *mut Self::ControlMessage {
unsafe { libc::CMSG_FIRSTHDR(self) }
}
fn cmsg_nxt_hdr(&self, cmsg: &Self::ControlMessage) -> *mut Self::ControlMessage {
unsafe { libc::CMSG_NXTHDR(self, cmsg) }
}
fn set_control_len(&mut self, len: usize) {
self.msg_controllen = len as _;
if len == 0 {
// netbsd is particular about this being a NULL pointer if there are no control
// messages.
self.msg_control = std::ptr::null_mut();
}
}
fn control_len(&self) -> usize {
self.msg_controllen as _
}
}
#[cfg(apple_fast)]
impl MsgHdr for crate::imp::msghdr_x {
type ControlMessage = libc::cmsghdr;
fn cmsg_first_hdr(&self) -> *mut Self::ControlMessage {
let selfp = self as *const _ as *mut libc::msghdr;
unsafe { libc::CMSG_FIRSTHDR(selfp) }
}
fn cmsg_nxt_hdr(&self, cmsg: &Self::ControlMessage) -> *mut Self::ControlMessage {
let selfp = self as *const _ as *mut libc::msghdr;
unsafe { libc::CMSG_NXTHDR(selfp, cmsg) }
}
fn set_control_len(&mut self, len: usize) {
self.msg_controllen = len as _;
}
fn control_len(&self) -> usize {
self.msg_controllen as _
}
}
/// Helpers for [`libc::cmsghdr`]
impl CMsgHdr for libc::cmsghdr {
fn cmsg_len(length: usize) -> usize {
unsafe { libc::CMSG_LEN(length as _) as usize }
}
fn cmsg_space(length: usize) -> usize {
unsafe { libc::CMSG_SPACE(length as _) as usize }
}
fn cmsg_data(&self) -> *mut c_uchar {
unsafe { libc::CMSG_DATA(self) }
}
fn set(&mut self, level: c_int, ty: c_int, len: usize) {
self.cmsg_level = level as _;
self.cmsg_type = ty as _;
self.cmsg_len = len as _;
}
fn len(&self) -> usize {
self.cmsg_len as _
}
}

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use std::{
ffi::{c_int, c_uchar},
mem, ptr,
};
use windows_sys::Win32::Networking::WinSock;
use super::{CMsgHdr, MsgHdr};
#[derive(Copy, Clone)]
#[repr(align(8))] // Conservative bound for align_of<WinSock::CMSGHDR>
pub(crate) struct Aligned<T>(pub(crate) T);
/// Helpers for [`WinSock::WSAMSG`]
// https://learn.microsoft.com/en-us/windows/win32/api/ws2def/ns-ws2def-wsamsg
// https://microsoft.github.io/windows-docs-rs/doc/windows/Win32/Networking/WinSock/struct.WSAMSG.html
impl MsgHdr for WinSock::WSAMSG {
type ControlMessage = WinSock::CMSGHDR;
fn cmsg_first_hdr(&self) -> *mut Self::ControlMessage {
if self.Control.len as usize >= mem::size_of::<WinSock::CMSGHDR>() {
self.Control.buf as *mut WinSock::CMSGHDR
} else {
ptr::null_mut::<WinSock::CMSGHDR>()
}
}
fn cmsg_nxt_hdr(&self, cmsg: &Self::ControlMessage) -> *mut Self::ControlMessage {
let next =
(cmsg as *const _ as usize + cmsghdr_align(cmsg.cmsg_len)) as *mut WinSock::CMSGHDR;
let max = self.Control.buf as usize + self.Control.len as usize;
if unsafe { next.offset(1) } as usize > max {
ptr::null_mut()
} else {
next
}
}
fn set_control_len(&mut self, len: usize) {
self.Control.len = len as _;
}
fn control_len(&self) -> usize {
self.Control.len as _
}
}
/// Helpers for [`WinSock::CMSGHDR`]
// https://learn.microsoft.com/en-us/windows/win32/api/ws2def/ns-ws2def-wsacmsghdr
// https://microsoft.github.io/windows-docs-rs/doc/windows/Win32/Networking/WinSock/struct.CMSGHDR.html
impl CMsgHdr for WinSock::CMSGHDR {
fn cmsg_len(length: usize) -> usize {
cmsgdata_align(mem::size_of::<Self>()) + length
}
fn cmsg_space(length: usize) -> usize {
cmsgdata_align(mem::size_of::<Self>() + cmsghdr_align(length))
}
fn cmsg_data(&self) -> *mut c_uchar {
(self as *const _ as usize + cmsgdata_align(mem::size_of::<Self>())) as *mut c_uchar
}
fn set(&mut self, level: c_int, ty: c_int, len: usize) {
self.cmsg_level = level as _;
self.cmsg_type = ty as _;
self.cmsg_len = len as _;
}
fn len(&self) -> usize {
self.cmsg_len as _
}
}
// Helpers functions for `WinSock::WSAMSG` and `WinSock::CMSGHDR` are based on C macros from
// https://github.com/microsoft/win32metadata/blob/main/generation/WinSDK/RecompiledIdlHeaders/shared/ws2def.h#L741
fn cmsghdr_align(length: usize) -> usize {
(length + mem::align_of::<WinSock::CMSGHDR>() - 1) & !(mem::align_of::<WinSock::CMSGHDR>() - 1)
}
fn cmsgdata_align(length: usize) -> usize {
(length + mem::align_of::<usize>() - 1) & !(mem::align_of::<usize>() - 1)
}

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use std::{
io::{self, IoSliceMut},
sync::Mutex,
time::Instant,
};
use super::{IO_ERROR_LOG_INTERVAL, RecvMeta, Transmit, UdpSockRef, log_sendmsg_error};
/// Fallback UDP socket interface that stubs out all special functionality
///
/// Used when a better implementation is not available for a particular target, at the cost of
/// reduced performance compared to that enabled by some target-specific interfaces.
#[derive(Debug)]
pub struct UdpSocketState {
last_send_error: Mutex<Instant>,
}
impl UdpSocketState {
pub fn new(socket: UdpSockRef<'_>) -> io::Result<Self> {
socket.0.set_nonblocking(true)?;
let now = Instant::now();
Ok(Self {
last_send_error: Mutex::new(now.checked_sub(2 * IO_ERROR_LOG_INTERVAL).unwrap_or(now)),
})
}
/// Sends a [`Transmit`] on the given socket.
///
/// This function will only ever return errors of kind [`io::ErrorKind::WouldBlock`].
/// All other errors will be logged and converted to `Ok`.
///
/// UDP transmission errors are considered non-fatal because higher-level protocols must
/// employ retransmits and timeouts anyway in order to deal with UDP's unreliable nature.
/// Thus, logging is most likely the only thing you can do with these errors.
///
/// If you would like to handle these errors yourself, use [`UdpSocketState::try_send`]
/// instead.
pub fn send(&self, socket: UdpSockRef<'_>, transmit: &Transmit<'_>) -> io::Result<()> {
match send(socket, transmit) {
Ok(()) => Ok(()),
Err(e) if e.kind() == io::ErrorKind::WouldBlock => Err(e),
Err(e) => {
log_sendmsg_error(&self.last_send_error, e, transmit);
Ok(())
}
}
}
/// Sends a [`Transmit`] on the given socket without any additional error handling.
pub fn try_send(&self, socket: UdpSockRef<'_>, transmit: &Transmit<'_>) -> io::Result<()> {
send(socket, transmit)
}
pub fn recv(
&self,
socket: UdpSockRef<'_>,
bufs: &mut [IoSliceMut<'_>],
meta: &mut [RecvMeta],
) -> io::Result<usize> {
// Safety: both `IoSliceMut` and `MaybeUninitSlice` promise to have the
// same layout, that of `iovec`/`WSABUF`. Furthermore `recv_vectored`
// promises to not write unitialised bytes to the `bufs` and pass it
// directly to the `recvmsg` system call, so this is safe.
let bufs = unsafe {
&mut *(bufs as *mut [IoSliceMut<'_>] as *mut [socket2::MaybeUninitSlice<'_>])
};
let (len, _flags, addr) = socket.0.recv_from_vectored(bufs)?;
meta[0] = RecvMeta {
len,
stride: len,
addr: addr.as_socket().unwrap(),
ecn: None,
dst_ip: None,
};
Ok(1)
}
#[inline]
pub fn max_gso_segments(&self) -> usize {
1
}
#[inline]
pub fn gro_segments(&self) -> usize {
1
}
/// Resize the send buffer of `socket` to `bytes`
#[inline]
pub fn set_send_buffer_size(&self, socket: UdpSockRef<'_>, bytes: usize) -> io::Result<()> {
socket.0.set_send_buffer_size(bytes)
}
/// Resize the receive buffer of `socket` to `bytes`
#[inline]
pub fn set_recv_buffer_size(&self, socket: UdpSockRef<'_>, bytes: usize) -> io::Result<()> {
socket.0.set_recv_buffer_size(bytes)
}
/// Get the size of the `socket` send buffer
#[inline]
pub fn send_buffer_size(&self, socket: UdpSockRef<'_>) -> io::Result<usize> {
socket.0.send_buffer_size()
}
/// Get the size of the `socket` receive buffer
#[inline]
pub fn recv_buffer_size(&self, socket: UdpSockRef<'_>) -> io::Result<usize> {
socket.0.recv_buffer_size()
}
#[inline]
pub fn may_fragment(&self) -> bool {
true
}
}
fn send(socket: UdpSockRef<'_>, transmit: &Transmit<'_>) -> io::Result<()> {
socket.0.send_to(
transmit.contents,
&socket2::SockAddr::from(transmit.destination),
)
}
pub(crate) const BATCH_SIZE: usize = 1;

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//! 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
#![warn(unreachable_pub)]
#![warn(clippy::use_self)]
use std::net::{IpAddr, Ipv6Addr, SocketAddr};
#[cfg(unix)]
use std::os::unix::io::AsFd;
#[cfg(windows)]
use std::os::windows::io::AsSocket;
#[cfg(not(wasm_browser))]
use std::{
sync::Mutex,
time::{Duration, Instant},
};
#[cfg(any(unix, windows))]
mod cmsg;
#[cfg(unix)]
#[path = "unix.rs"]
mod imp;
#[cfg(windows)]
#[path = "windows.rs"]
mod imp;
// No ECN support
#[cfg(not(any(wasm_browser, unix, windows)))]
#[path = "fallback.rs"]
mod imp;
#[allow(unused_imports, unused_macros)]
mod log {
#[cfg(all(feature = "direct-log", not(feature = "tracing")))]
pub(crate) use log::{debug, error, info, trace, warn};
#[cfg(feature = "tracing")]
pub(crate) use tracing::{debug, error, info, trace, warn};
#[cfg(not(any(feature = "direct-log", feature = "tracing")))]
mod no_op {
macro_rules! trace ( ($($tt:tt)*) => {{}} );
macro_rules! debug ( ($($tt:tt)*) => {{}} );
macro_rules! info ( ($($tt:tt)*) => {{}} );
macro_rules! log_warn ( ($($tt:tt)*) => {{}} );
macro_rules! error ( ($($tt:tt)*) => {{}} );
pub(crate) use {debug, error, info, log_warn as warn, trace};
}
#[cfg(not(any(feature = "direct-log", feature = "tracing")))]
pub(crate) use no_op::*;
}
#[cfg(not(wasm_browser))]
pub use imp::UdpSocketState;
/// Number of UDP packets to send/receive at a time
#[cfg(not(wasm_browser))]
pub const BATCH_SIZE: usize = imp::BATCH_SIZE;
/// Number of UDP packets to send/receive at a time
#[cfg(wasm_browser)]
pub const BATCH_SIZE: usize = 1;
/// Metadata for a single buffer filled with bytes received from the network
///
/// This associated buffer can contain one or more datagrams, see [`stride`].
///
/// [`stride`]: RecvMeta::stride
#[derive(Debug, Copy, Clone)]
pub struct RecvMeta {
/// The source address of the datagram(s) contained in the buffer
pub addr: SocketAddr,
/// The number of bytes the associated buffer has
pub len: usize,
/// The size of a single datagram in the associated buffer
///
/// When GRO (Generic Receive Offload) is used this indicates the size of a single
/// datagram inside the buffer. If the buffer is larger, that is if [`len`] is greater
/// then this value, then the individual datagrams contained have their boundaries at
/// `stride` increments from the start. The last datagram could be smaller than
/// `stride`.
///
/// [`len`]: RecvMeta::len
pub stride: usize,
/// The Explicit Congestion Notification bits for the datagram(s) in the buffer
pub ecn: Option<EcnCodepoint>,
/// The destination IP address which was encoded in this datagram
///
/// Populated on platforms: Windows, Linux, Android (API level > 25),
/// FreeBSD, OpenBSD, NetBSD, macOS, and iOS.
pub dst_ip: Option<IpAddr>,
}
impl Default for RecvMeta {
/// Constructs a value with arbitrary fields, intended to be overwritten
fn default() -> Self {
Self {
addr: SocketAddr::new(Ipv6Addr::UNSPECIFIED.into(), 0),
len: 0,
stride: 0,
ecn: None,
dst_ip: None,
}
}
}
/// An outgoing packet
#[derive(Debug, Clone)]
pub struct Transmit<'a> {
/// The socket this datagram should be sent to
pub destination: SocketAddr,
/// Explicit congestion notification bits to set on the packet
pub ecn: Option<EcnCodepoint>,
/// Contents of the datagram
pub contents: &'a [u8],
/// The segment size if this transmission contains multiple datagrams.
/// This is `None` if the transmit only contains a single datagram
pub segment_size: Option<usize>,
/// Optional source IP address for the datagram
pub src_ip: Option<IpAddr>,
}
/// Log at most 1 IO error per minute
#[cfg(not(wasm_browser))]
const IO_ERROR_LOG_INTERVAL: Duration = std::time::Duration::from_secs(60);
/// Logs a warning message when sendmsg fails
///
/// Logging will only be performed if at least [`IO_ERROR_LOG_INTERVAL`]
/// has elapsed since the last error was logged.
#[cfg(all(not(wasm_browser), any(feature = "tracing", feature = "direct-log")))]
fn log_sendmsg_error(
last_send_error: &Mutex<Instant>,
err: impl core::fmt::Debug,
transmit: &Transmit,
) {
let now = Instant::now();
let last_send_error = &mut *last_send_error.lock().expect("poisend lock");
if now.saturating_duration_since(*last_send_error) > IO_ERROR_LOG_INTERVAL {
*last_send_error = now;
log::warn!(
"sendmsg error: {:?}, Transmit: {{ destination: {:?}, src_ip: {:?}, ecn: {:?}, len: {:?}, segment_size: {:?} }}",
err,
transmit.destination,
transmit.src_ip,
transmit.ecn,
transmit.contents.len(),
transmit.segment_size
);
}
}
// No-op
#[cfg(not(any(wasm_browser, feature = "tracing", feature = "direct-log")))]
fn log_sendmsg_error(_: &Mutex<Instant>, _: impl core::fmt::Debug, _: &Transmit) {}
/// A borrowed UDP socket
///
/// On Unix, constructible via `From<T: AsFd>`. On Windows, constructible via `From<T:
/// AsSocket>`.
// Wrapper around socket2 to avoid making it a public dependency and incurring stability risk
#[cfg(not(wasm_browser))]
pub struct UdpSockRef<'a>(socket2::SockRef<'a>);
#[cfg(unix)]
impl<'s, S> From<&'s S> for UdpSockRef<'s>
where
S: AsFd,
{
fn from(socket: &'s S) -> Self {
Self(socket.into())
}
}
#[cfg(windows)]
impl<'s, S> From<&'s S> for UdpSockRef<'s>
where
S: AsSocket,
{
fn from(socket: &'s S) -> Self {
Self(socket.into())
}
}
/// Explicit congestion notification codepoint
#[repr(u8)]
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
pub enum EcnCodepoint {
/// The ECT(0) codepoint, indicating that an endpoint is ECN-capable
Ect0 = 0b10,
/// The ECT(1) codepoint, indicating that an endpoint is ECN-capable
Ect1 = 0b01,
/// The CE codepoint, signalling that congestion was experienced
Ce = 0b11,
}
impl EcnCodepoint {
/// Create new object from the given bits
pub fn from_bits(x: u8) -> Option<Self> {
use EcnCodepoint::*;
Some(match x & 0b11 {
0b10 => Ect0,
0b01 => Ect1,
0b11 => Ce,
_ => {
return None;
}
})
}
}

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use std::{
io::{self, IoSliceMut},
mem,
net::{IpAddr, Ipv4Addr},
os::windows::io::AsRawSocket,
ptr,
sync::Mutex,
time::Instant,
};
use libc::{c_int, c_uint};
use once_cell::sync::Lazy;
use windows_sys::Win32::Networking::WinSock;
use crate::{
EcnCodepoint, IO_ERROR_LOG_INTERVAL, RecvMeta, Transmit, UdpSockRef,
cmsg::{self, CMsgHdr},
log::debug,
log_sendmsg_error,
};
/// QUIC-friendly UDP socket for Windows
///
/// Unlike a standard Windows UDP socket, this allows ECN bits to be read and written.
#[derive(Debug)]
pub struct UdpSocketState {
last_send_error: Mutex<Instant>,
}
impl UdpSocketState {
pub fn new(socket: UdpSockRef<'_>) -> io::Result<Self> {
assert!(
CMSG_LEN
>= WinSock::CMSGHDR::cmsg_space(mem::size_of::<WinSock::IN6_PKTINFO>())
+ WinSock::CMSGHDR::cmsg_space(mem::size_of::<c_int>())
+ WinSock::CMSGHDR::cmsg_space(mem::size_of::<u32>())
);
assert!(
mem::align_of::<WinSock::CMSGHDR>() <= mem::align_of::<cmsg::Aligned<[u8; 0]>>(),
"control message buffers will be misaligned"
);
socket.0.set_nonblocking(true)?;
let addr = socket.0.local_addr()?;
let is_ipv6 = addr.as_socket_ipv6().is_some();
let v6only = unsafe {
let mut result: u32 = 0;
let mut len = mem::size_of_val(&result) as i32;
let rc = WinSock::getsockopt(
socket.0.as_raw_socket() as _,
WinSock::IPPROTO_IPV6,
WinSock::IPV6_V6ONLY as _,
&mut result as *mut _ as _,
&mut len,
);
if rc == -1 {
return Err(io::Error::last_os_error());
}
result != 0
};
let is_ipv4 = addr.as_socket_ipv4().is_some() || !v6only;
// We don't support old versions of Windows that do not enable access to `WSARecvMsg()`
if WSARECVMSG_PTR.is_none() {
return Err(io::Error::new(
io::ErrorKind::Unsupported,
"network stack does not support WSARecvMsg function",
));
}
if is_ipv4 {
set_socket_option(
&*socket.0,
WinSock::IPPROTO_IP,
WinSock::IP_DONTFRAGMENT,
OPTION_ON,
)?;
set_socket_option(
&*socket.0,
WinSock::IPPROTO_IP,
WinSock::IP_PKTINFO,
OPTION_ON,
)?;
set_socket_option(
&*socket.0,
WinSock::IPPROTO_IP,
WinSock::IP_RECVECN,
OPTION_ON,
)?;
}
if is_ipv6 {
set_socket_option(
&*socket.0,
WinSock::IPPROTO_IPV6,
WinSock::IPV6_DONTFRAG,
OPTION_ON,
)?;
set_socket_option(
&*socket.0,
WinSock::IPPROTO_IPV6,
WinSock::IPV6_PKTINFO,
OPTION_ON,
)?;
set_socket_option(
&*socket.0,
WinSock::IPPROTO_IPV6,
WinSock::IPV6_RECVECN,
OPTION_ON,
)?;
}
let now = Instant::now();
Ok(Self {
last_send_error: Mutex::new(now.checked_sub(2 * IO_ERROR_LOG_INTERVAL).unwrap_or(now)),
})
}
/// Enable or disable receive offloading.
///
/// Also referred to as UDP Receive Segment Coalescing Offload (URO) on Windows.
///
/// <https://learn.microsoft.com/en-us/windows-hardware/drivers/network/udp-rsc-offload>
///
/// Disabled by default on Windows due to <https://github.com/quinn-rs/quinn/issues/2041>.
pub fn set_gro(&self, socket: UdpSockRef<'_>, enable: bool) -> io::Result<()> {
set_socket_option(
&*socket.0,
WinSock::IPPROTO_UDP,
WinSock::UDP_RECV_MAX_COALESCED_SIZE,
match enable {
// u32 per
// https://learn.microsoft.com/en-us/windows/win32/winsock/ipproto-udp-socket-options.
// Choice of 2^16 - 1 inspired by msquic.
true => u16::MAX as u32,
false => 0,
},
)
}
/// Sends a [`Transmit`] on the given socket.
///
/// This function will only ever return errors of kind [`io::ErrorKind::WouldBlock`].
/// All other errors will be logged and converted to `Ok`.
///
/// UDP transmission errors are considered non-fatal because higher-level protocols must
/// employ retransmits and timeouts anyway in order to deal with UDP's unreliable nature.
/// Thus, logging is most likely the only thing you can do with these errors.
///
/// If you would like to handle these errors yourself, use [`UdpSocketState::try_send`]
/// instead.
pub fn send(&self, socket: UdpSockRef<'_>, transmit: &Transmit<'_>) -> io::Result<()> {
match send(socket, transmit) {
Ok(()) => Ok(()),
Err(e) if e.kind() == io::ErrorKind::WouldBlock => Err(e),
Err(e) => {
log_sendmsg_error(&self.last_send_error, e, transmit);
Ok(())
}
}
}
/// Sends a [`Transmit`] on the given socket without any additional error handling.
pub fn try_send(&self, socket: UdpSockRef<'_>, transmit: &Transmit<'_>) -> io::Result<()> {
send(socket, transmit)
}
pub fn recv(
&self,
socket: UdpSockRef<'_>,
bufs: &mut [IoSliceMut<'_>],
meta: &mut [RecvMeta],
) -> io::Result<usize> {
let wsa_recvmsg_ptr = WSARECVMSG_PTR.expect("valid function pointer for WSARecvMsg");
// we cannot use [`socket2::MsgHdrMut`] as we do not have access to inner field which holds the WSAMSG
let mut ctrl_buf = cmsg::Aligned([0; CMSG_LEN]);
let mut source: WinSock::SOCKADDR_INET = unsafe { mem::zeroed() };
let mut data = WinSock::WSABUF {
buf: bufs[0].as_mut_ptr(),
len: bufs[0].len() as _,
};
let ctrl = WinSock::WSABUF {
buf: ctrl_buf.0.as_mut_ptr(),
len: ctrl_buf.0.len() as _,
};
let mut wsa_msg = WinSock::WSAMSG {
name: &mut source as *mut _ as *mut _,
namelen: mem::size_of_val(&source) as _,
lpBuffers: &mut data,
Control: ctrl,
dwBufferCount: 1,
dwFlags: 0,
};
let mut len = 0;
unsafe {
let rc = (wsa_recvmsg_ptr)(
socket.0.as_raw_socket() as usize,
&mut wsa_msg,
&mut len,
ptr::null_mut(),
None,
);
if rc == -1 {
return Err(io::Error::last_os_error());
}
}
let addr = unsafe {
let (_, addr) = socket2::SockAddr::try_init(|addr_storage, len| {
*len = mem::size_of_val(&source) as _;
ptr::copy_nonoverlapping(&source, addr_storage as _, 1);
Ok(())
})?;
addr.as_socket()
};
// Decode control messages (PKTINFO and ECN)
let mut ecn_bits = 0;
let mut dst_ip = None;
let mut stride = len;
let cmsg_iter = unsafe { cmsg::Iter::new(&wsa_msg) };
for cmsg in cmsg_iter {
const UDP_COALESCED_INFO: i32 = WinSock::UDP_COALESCED_INFO as i32;
// [header (len)][data][padding(len + sizeof(data))] -> [header][data][padding]
match (cmsg.cmsg_level, cmsg.cmsg_type) {
(WinSock::IPPROTO_IP, WinSock::IP_PKTINFO) => {
let pktinfo =
unsafe { cmsg::decode::<WinSock::IN_PKTINFO, WinSock::CMSGHDR>(cmsg) };
// Addr is stored in big endian format
let ip4 = Ipv4Addr::from(u32::from_be(unsafe { pktinfo.ipi_addr.S_un.S_addr }));
dst_ip = Some(ip4.into());
}
(WinSock::IPPROTO_IPV6, WinSock::IPV6_PKTINFO) => {
let pktinfo =
unsafe { cmsg::decode::<WinSock::IN6_PKTINFO, WinSock::CMSGHDR>(cmsg) };
// Addr is stored in big endian format
dst_ip = Some(IpAddr::from(unsafe { pktinfo.ipi6_addr.u.Byte }));
}
(WinSock::IPPROTO_IP, WinSock::IP_ECN) => {
// ECN is a C integer https://learn.microsoft.com/en-us/windows/win32/winsock/winsock-ecn
ecn_bits = unsafe { cmsg::decode::<c_int, WinSock::CMSGHDR>(cmsg) };
}
(WinSock::IPPROTO_IPV6, WinSock::IPV6_ECN) => {
// ECN is a C integer https://learn.microsoft.com/en-us/windows/win32/winsock/winsock-ecn
ecn_bits = unsafe { cmsg::decode::<c_int, WinSock::CMSGHDR>(cmsg) };
}
(WinSock::IPPROTO_UDP, UDP_COALESCED_INFO) => {
// Has type u32 (aka DWORD) per
// https://learn.microsoft.com/en-us/windows/win32/winsock/ipproto-udp-socket-options
stride = unsafe { cmsg::decode::<u32, WinSock::CMSGHDR>(cmsg) };
}
_ => {}
}
}
meta[0] = RecvMeta {
len: len as usize,
stride: stride as usize,
addr: addr.unwrap(),
ecn: EcnCodepoint::from_bits(ecn_bits as u8),
dst_ip,
};
Ok(1)
}
/// The maximum amount of segments which can be transmitted if a platform
/// supports Generic Send Offload (GSO).
///
/// This is 1 if the platform doesn't support GSO. Subject to change if errors are detected
/// while using GSO.
#[inline]
pub fn max_gso_segments(&self) -> usize {
*MAX_GSO_SEGMENTS
}
/// The number of segments to read when GRO is enabled. Used as a factor to
/// compute the receive buffer size.
///
/// Returns 1 if the platform doesn't support GRO.
#[inline]
pub fn gro_segments(&self) -> usize {
// Arbitrary reasonable value inspired by Linux and msquic
64
}
/// Resize the send buffer of `socket` to `bytes`
#[inline]
pub fn set_send_buffer_size(&self, socket: UdpSockRef<'_>, bytes: usize) -> io::Result<()> {
socket.0.set_send_buffer_size(bytes)
}
/// Resize the receive buffer of `socket` to `bytes`
#[inline]
pub fn set_recv_buffer_size(&self, socket: UdpSockRef<'_>, bytes: usize) -> io::Result<()> {
socket.0.set_recv_buffer_size(bytes)
}
/// Get the size of the `socket` send buffer
#[inline]
pub fn send_buffer_size(&self, socket: UdpSockRef<'_>) -> io::Result<usize> {
socket.0.send_buffer_size()
}
/// Get the size of the `socket` receive buffer
#[inline]
pub fn recv_buffer_size(&self, socket: UdpSockRef<'_>) -> io::Result<usize> {
socket.0.recv_buffer_size()
}
#[inline]
pub fn may_fragment(&self) -> bool {
false
}
}
fn send(socket: UdpSockRef<'_>, transmit: &Transmit<'_>) -> io::Result<()> {
// we cannot use [`socket2::sendmsg()`] and [`socket2::MsgHdr`] as we do not have access
// to the inner field which holds the WSAMSG
let mut ctrl_buf = cmsg::Aligned([0; CMSG_LEN]);
let daddr = socket2::SockAddr::from(transmit.destination);
let mut data = WinSock::WSABUF {
buf: transmit.contents.as_ptr() as *mut _,
len: transmit.contents.len() as _,
};
let ctrl = WinSock::WSABUF {
buf: ctrl_buf.0.as_mut_ptr(),
len: ctrl_buf.0.len() as _,
};
let mut wsa_msg = WinSock::WSAMSG {
name: daddr.as_ptr() as *mut _,
namelen: daddr.len(),
lpBuffers: &mut data,
Control: ctrl,
dwBufferCount: 1,
dwFlags: 0,
};
// Add control messages (ECN and PKTINFO)
let mut encoder = unsafe { cmsg::Encoder::new(&mut wsa_msg) };
if let Some(ip) = transmit.src_ip {
let ip = std::net::SocketAddr::new(ip, 0);
let ip = socket2::SockAddr::from(ip);
match ip.family() {
WinSock::AF_INET => {
let src_ip = unsafe { ptr::read(ip.as_ptr() as *const WinSock::SOCKADDR_IN) };
let pktinfo = WinSock::IN_PKTINFO {
ipi_addr: src_ip.sin_addr,
ipi_ifindex: 0,
};
encoder.push(WinSock::IPPROTO_IP, WinSock::IP_PKTINFO, pktinfo);
}
WinSock::AF_INET6 => {
let src_ip = unsafe { ptr::read(ip.as_ptr() as *const WinSock::SOCKADDR_IN6) };
let pktinfo = WinSock::IN6_PKTINFO {
ipi6_addr: src_ip.sin6_addr,
ipi6_ifindex: unsafe { src_ip.Anonymous.sin6_scope_id },
};
encoder.push(WinSock::IPPROTO_IPV6, WinSock::IPV6_PKTINFO, pktinfo);
}
_ => {
return Err(io::Error::from(io::ErrorKind::InvalidInput));
}
}
}
// ECN is a C integer https://learn.microsoft.com/en-us/windows/win32/winsock/winsock-ecn
let ecn = transmit.ecn.map_or(0, |x| x as c_int);
// True for IPv4 or IPv4-Mapped IPv6
let is_ipv4 = transmit.destination.is_ipv4()
|| matches!(transmit.destination.ip(), IpAddr::V6(addr) if addr.to_ipv4_mapped().is_some());
if is_ipv4 {
encoder.push(WinSock::IPPROTO_IP, WinSock::IP_ECN, ecn);
} else {
encoder.push(WinSock::IPPROTO_IPV6, WinSock::IPV6_ECN, ecn);
}
// Segment size is a u32 https://learn.microsoft.com/en-us/windows/win32/api/ws2tcpip/nf-ws2tcpip-wsasetudpsendmessagesize
if let Some(segment_size) = transmit.segment_size {
encoder.push(
WinSock::IPPROTO_UDP,
WinSock::UDP_SEND_MSG_SIZE,
segment_size as u32,
);
}
encoder.finish();
let mut len = 0;
let rc = unsafe {
WinSock::WSASendMsg(
socket.0.as_raw_socket() as usize,
&wsa_msg,
0,
&mut len,
ptr::null_mut(),
None,
)
};
match rc {
0 => Ok(()),
_ => Err(io::Error::last_os_error()),
}
}
fn set_socket_option(
socket: &impl AsRawSocket,
level: i32,
name: i32,
value: u32,
) -> io::Result<()> {
let rc = unsafe {
WinSock::setsockopt(
socket.as_raw_socket() as usize,
level,
name,
&value as *const _ as _,
mem::size_of_val(&value) as _,
)
};
match rc == 0 {
true => Ok(()),
false => Err(io::Error::last_os_error()),
}
}
pub(crate) const BATCH_SIZE: usize = 1;
// Enough to store max(IP_PKTINFO + IP_ECN, IPV6_PKTINFO + IPV6_ECN) + max(UDP_SEND_MSG_SIZE, UDP_COALESCED_INFO) bytes (header + data) and some extra margin
const CMSG_LEN: usize = 128;
const OPTION_ON: u32 = 1;
// FIXME this could use [`std::sync::OnceLock`] once the MSRV is bumped to 1.70 and upper
static WSARECVMSG_PTR: Lazy<WinSock::LPFN_WSARECVMSG> = Lazy::new(|| {
let s = unsafe { WinSock::socket(WinSock::AF_INET as _, WinSock::SOCK_DGRAM as _, 0) };
if s == WinSock::INVALID_SOCKET {
debug!(
"ignoring WSARecvMsg function pointer due to socket creation error: {}",
io::Error::last_os_error()
);
return None;
}
// Detect if OS expose WSARecvMsg API based on
// https://github.com/Azure/mio-uds-windows/blob/a3c97df82018086add96d8821edb4aa85ec1b42b/src/stdnet/ext.rs#L601
let guid = WinSock::WSAID_WSARECVMSG;
let mut wsa_recvmsg_ptr = None;
let mut len = 0;
// Safety: Option handles the NULL pointer with a None value
let rc = unsafe {
WinSock::WSAIoctl(
s as _,
WinSock::SIO_GET_EXTENSION_FUNCTION_POINTER,
&guid as *const _ as *const _,
mem::size_of_val(&guid) as u32,
&mut wsa_recvmsg_ptr as *mut _ as *mut _,
mem::size_of_val(&wsa_recvmsg_ptr) as u32,
&mut len,
ptr::null_mut(),
None,
)
};
if rc == -1 {
debug!(
"ignoring WSARecvMsg function pointer due to ioctl error: {}",
io::Error::last_os_error()
);
} else if len as usize != mem::size_of::<WinSock::LPFN_WSARECVMSG>() {
debug!("ignoring WSARecvMsg function pointer due to pointer size mismatch");
wsa_recvmsg_ptr = None;
}
unsafe {
WinSock::closesocket(s);
}
wsa_recvmsg_ptr
});
static MAX_GSO_SEGMENTS: Lazy<usize> = Lazy::new(|| {
let socket = match std::net::UdpSocket::bind("[::]:0")
.or_else(|_| std::net::UdpSocket::bind((Ipv4Addr::LOCALHOST, 0)))
{
Ok(socket) => socket,
Err(_) => return 1,
};
const GSO_SIZE: c_uint = 1500;
match set_socket_option(
&socket,
WinSock::IPPROTO_UDP,
WinSock::UDP_SEND_MSG_SIZE,
GSO_SIZE,
) {
// Empirically found on Windows 11 x64
Ok(()) => 512,
Err(_) => 1,
}
});

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#[cfg(not(any(target_os = "openbsd", target_os = "netbsd", solarish)))]
use std::net::{SocketAddr, SocketAddrV6};
use std::{
io::IoSliceMut,
net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddrV4, UdpSocket},
slice,
};
use quinn_udp::{EcnCodepoint, RecvMeta, Transmit, UdpSocketState};
use socket2::Socket;
#[test]
fn basic() {
let send = UdpSocket::bind((Ipv6Addr::LOCALHOST, 0))
.or_else(|_| UdpSocket::bind((Ipv4Addr::LOCALHOST, 0)))
.unwrap();
let recv = UdpSocket::bind((Ipv6Addr::LOCALHOST, 0))
.or_else(|_| UdpSocket::bind((Ipv4Addr::LOCALHOST, 0)))
.unwrap();
let dst_addr = recv.local_addr().unwrap();
test_send_recv(
&send.into(),
&recv.into(),
Transmit {
destination: dst_addr,
ecn: None,
contents: b"hello",
segment_size: None,
src_ip: None,
},
);
}
#[test]
fn basic_src_ip() {
let send = UdpSocket::bind((Ipv6Addr::LOCALHOST, 0))
.or_else(|_| UdpSocket::bind((Ipv4Addr::LOCALHOST, 0)))
.unwrap();
let recv = UdpSocket::bind((Ipv6Addr::LOCALHOST, 0))
.or_else(|_| UdpSocket::bind((Ipv4Addr::LOCALHOST, 0)))
.unwrap();
let src_ip = send.local_addr().unwrap().ip();
let dst_addr = recv.local_addr().unwrap();
test_send_recv(
&send.into(),
&recv.into(),
Transmit {
destination: dst_addr,
ecn: None,
contents: b"hello",
segment_size: None,
src_ip: Some(src_ip),
},
);
}
#[test]
fn ecn_v6() {
let send = Socket::from(UdpSocket::bind((Ipv6Addr::LOCALHOST, 0)).unwrap());
let recv = Socket::from(UdpSocket::bind((Ipv6Addr::LOCALHOST, 0)).unwrap());
for codepoint in [EcnCodepoint::Ect0, EcnCodepoint::Ect1] {
test_send_recv(
&send,
&recv,
Transmit {
destination: recv.local_addr().unwrap().as_socket().unwrap(),
ecn: Some(codepoint),
contents: b"hello",
segment_size: None,
src_ip: None,
},
);
}
}
#[test]
#[cfg(not(any(target_os = "openbsd", target_os = "netbsd", solarish)))]
fn ecn_v4() {
let send = Socket::from(UdpSocket::bind((Ipv4Addr::LOCALHOST, 0)).unwrap());
let recv = Socket::from(UdpSocket::bind((Ipv4Addr::LOCALHOST, 0)).unwrap());
for codepoint in [EcnCodepoint::Ect0, EcnCodepoint::Ect1] {
test_send_recv(
&send,
&recv,
Transmit {
destination: recv.local_addr().unwrap().as_socket().unwrap(),
ecn: Some(codepoint),
contents: b"hello",
segment_size: None,
src_ip: None,
},
);
}
}
#[test]
#[cfg(not(any(target_os = "openbsd", target_os = "netbsd", solarish)))]
fn ecn_v6_dualstack() {
let recv = socket2::Socket::new(
socket2::Domain::IPV6,
socket2::Type::DGRAM,
Some(socket2::Protocol::UDP),
)
.unwrap();
recv.set_only_v6(false).unwrap();
// We must use the unspecified address here, rather than a local address, to support dual-stack
// mode
recv.bind(&socket2::SockAddr::from(
"[::]:0".parse::<SocketAddr>().unwrap(),
))
.unwrap();
let recv_v6 = SocketAddr::V6(SocketAddrV6::new(
Ipv6Addr::LOCALHOST,
recv.local_addr().unwrap().as_socket().unwrap().port(),
0,
0,
));
let recv_v4 = SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::LOCALHOST, recv_v6.port()));
for (src, dst) in [
(SocketAddr::new(IpAddr::V6(Ipv6Addr::LOCALHOST), 0), recv_v6),
(SocketAddr::new(IpAddr::V4(Ipv4Addr::LOCALHOST), 0), recv_v4),
] {
dbg!(src, dst);
let send = UdpSocket::bind(src).unwrap();
let send = Socket::from(send);
for codepoint in [EcnCodepoint::Ect0, EcnCodepoint::Ect1] {
test_send_recv(
&send,
&recv,
Transmit {
destination: dst,
ecn: Some(codepoint),
contents: b"hello",
segment_size: None,
src_ip: None,
},
);
}
}
}
#[test]
#[cfg(not(any(target_os = "openbsd", target_os = "netbsd", solarish)))]
fn ecn_v4_mapped_v6() {
let send = socket2::Socket::new(
socket2::Domain::IPV6,
socket2::Type::DGRAM,
Some(socket2::Protocol::UDP),
)
.unwrap();
send.set_only_v6(false).unwrap();
send.bind(&socket2::SockAddr::from(
"[::]:0".parse::<SocketAddr>().unwrap(),
))
.unwrap();
let recv = UdpSocket::bind((Ipv4Addr::LOCALHOST, 0)).unwrap();
let recv = Socket::from(recv);
let recv_v4_mapped_v6 = SocketAddr::V6(SocketAddrV6::new(
Ipv4Addr::LOCALHOST.to_ipv6_mapped(),
recv.local_addr().unwrap().as_socket().unwrap().port(),
0,
0,
));
for codepoint in [EcnCodepoint::Ect0, EcnCodepoint::Ect1] {
test_send_recv(
&send,
&recv,
Transmit {
destination: recv_v4_mapped_v6,
ecn: Some(codepoint),
contents: b"hello",
segment_size: None,
src_ip: None,
},
);
}
}
#[test]
#[cfg_attr(
not(any(target_os = "linux", target_os = "windows", target_os = "android")),
ignore
)]
fn gso() {
let send = UdpSocket::bind((Ipv6Addr::LOCALHOST, 0))
.or_else(|_| UdpSocket::bind((Ipv4Addr::LOCALHOST, 0)))
.unwrap();
let recv = UdpSocket::bind((Ipv6Addr::LOCALHOST, 0))
.or_else(|_| UdpSocket::bind((Ipv4Addr::LOCALHOST, 0)))
.unwrap();
let max_segments = UdpSocketState::new((&send).into())
.unwrap()
.max_gso_segments();
let dst_addr = recv.local_addr().unwrap();
const SEGMENT_SIZE: usize = 128;
let msg = vec![0xAB; SEGMENT_SIZE * max_segments];
test_send_recv(
&send.into(),
&recv.into(),
Transmit {
destination: dst_addr,
ecn: None,
contents: &msg,
segment_size: Some(SEGMENT_SIZE),
src_ip: None,
},
);
}
#[test]
fn socket_buffers() {
const BUFFER_SIZE: usize = 123456;
const FACTOR: usize = if cfg!(any(target_os = "linux", target_os = "android")) {
2 // Linux and Android set the buffer to double the requested size
} else {
1 // Everyone else is sane.
};
let send = socket2::Socket::new(
socket2::Domain::IPV4,
socket2::Type::DGRAM,
Some(socket2::Protocol::UDP),
)
.unwrap();
let recv = socket2::Socket::new(
socket2::Domain::IPV4,
socket2::Type::DGRAM,
Some(socket2::Protocol::UDP),
)
.unwrap();
for sock in [&send, &recv] {
sock.bind(&socket2::SockAddr::from(SocketAddrV4::new(
Ipv4Addr::LOCALHOST,
0,
)))
.unwrap();
let socket_state = UdpSocketState::new(sock.into()).expect("created socket state");
// Change the send buffer size.
let buffer_before = socket_state.send_buffer_size(sock.into()).unwrap();
assert_ne!(
buffer_before,
BUFFER_SIZE * FACTOR,
"make sure buffer is not already desired size"
);
socket_state
.set_send_buffer_size(sock.into(), BUFFER_SIZE)
.expect("set send buffer size {buffer_before} -> {BUFFER_SIZE}");
let buffer_after = socket_state.send_buffer_size(sock.into()).unwrap();
assert_eq!(
buffer_after,
BUFFER_SIZE * FACTOR,
"setting send buffer size to {BUFFER_SIZE} resulted in {buffer_before} -> {buffer_after}",
);
// Change the receive buffer size.
let buffer_before = socket_state.recv_buffer_size(sock.into()).unwrap();
socket_state
.set_recv_buffer_size(sock.into(), BUFFER_SIZE)
.expect("set recv buffer size {buffer_before} -> {BUFFER_SIZE}");
let buffer_after = socket_state.recv_buffer_size(sock.into()).unwrap();
assert_eq!(
buffer_after,
BUFFER_SIZE * FACTOR,
"setting recv buffer size to {BUFFER_SIZE} resulted in {buffer_before} -> {buffer_after}",
);
}
test_send_recv(
&send,
&recv,
Transmit {
destination: recv.local_addr().unwrap().as_socket().unwrap(),
ecn: None,
contents: b"hello",
segment_size: None,
src_ip: None,
},
);
}
fn test_send_recv(send: &Socket, recv: &Socket, transmit: Transmit) {
let send_state = UdpSocketState::new(send.into()).unwrap();
let recv_state = UdpSocketState::new(recv.into()).unwrap();
// Reverse non-blocking flag set by `UdpSocketState` to make the test non-racy
recv.set_nonblocking(false).unwrap();
send_state.try_send(send.into(), &transmit).unwrap();
let mut buf = [0; u16::MAX as usize];
let mut meta = RecvMeta::default();
let segment_size = transmit.segment_size.unwrap_or(transmit.contents.len());
let expected_datagrams = transmit.contents.len() / segment_size;
let mut datagrams = 0;
while datagrams < expected_datagrams {
let n = recv_state
.recv(
recv.into(),
&mut [IoSliceMut::new(&mut buf)],
slice::from_mut(&mut meta),
)
.unwrap();
assert_eq!(n, 1);
let segments = meta.len / meta.stride;
for i in 0..segments {
assert_eq!(
&buf[(i * meta.stride)..((i + 1) * meta.stride)],
&transmit.contents
[(datagrams + i) * segment_size..(datagrams + i + 1) * segment_size]
);
}
datagrams += segments;
assert_eq!(
meta.addr.port(),
send.local_addr().unwrap().as_socket().unwrap().port()
);
let send_v6 = send.local_addr().unwrap().as_socket().unwrap().is_ipv6();
let recv_v6 = recv.local_addr().unwrap().as_socket().unwrap().is_ipv6();
let mut addresses = vec![meta.addr.ip()];
// Not populated on every OS. See `RecvMeta::dst_ip` for details.
if let Some(addr) = meta.dst_ip {
addresses.push(addr);
}
for addr in addresses {
match (send_v6, recv_v6) {
(_, false) => assert_eq!(addr, Ipv4Addr::LOCALHOST),
// Windows gives us real IPv4 addrs, whereas *nix use IPv6-mapped IPv4
// addrs. Canonicalize to IPv6-mapped for robustness.
(false, true) => {
assert_eq!(ip_to_v6_mapped(addr), Ipv4Addr::LOCALHOST.to_ipv6_mapped())
}
(true, true) => assert!(
addr == Ipv6Addr::LOCALHOST || addr == Ipv4Addr::LOCALHOST.to_ipv6_mapped()
),
}
}
let ipv4_or_ipv4_mapped_ipv6 = match transmit.destination.ip() {
IpAddr::V4(_) => true,
IpAddr::V6(a) => a.to_ipv4_mapped().is_some(),
};
// On Android API level <= 25 the IPv4 `IP_TOS` control message is
// not supported and thus ECN bits can not be received.
if ipv4_or_ipv4_mapped_ipv6
&& cfg!(target_os = "android")
&& std::env::var("API_LEVEL")
.ok()
.and_then(|v| v.parse::<u32>().ok())
.expect("API_LEVEL environment variable to be set on Android")
<= 25
{
assert_eq!(meta.ecn, None);
} else {
assert_eq!(meta.ecn, transmit.ecn);
}
}
assert_eq!(datagrams, expected_datagrams);
}
fn ip_to_v6_mapped(x: IpAddr) -> IpAddr {
match x {
IpAddr::V4(x) => IpAddr::V6(x.to_ipv6_mapped()),
IpAddr::V6(_) => x,
}
}