chore: add vendor directory

10 files changed, 3053 insertions, 0 deletions

diff --git a/vendor/rustix/src/backend/libc/net/addr.rs b/vendor/rustix/src/backend/libc/net/addr.rs
new file mode 100644
index 00000000..1699ffa9
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/addr.rs
@@ -0,0 +1,390 @@
+//! Socket address utilities.
+
+use crate::backend::c;
+use crate::net::AddressFamily;
+#[cfg(unix)]
+use {
+    crate::ffi::CStr,
+    crate::io,
+    crate::net::addr::SocketAddrLen,
+    crate::path,
+    core::cmp::Ordering,
+    core::fmt,
+    core::hash::{Hash, Hasher},
+    core::slice,
+};
+#[cfg(all(unix, feature = "alloc"))]
+use {crate::ffi::CString, alloc::borrow::Cow, alloc::vec::Vec};
+
+/// `struct sockaddr_un`
+#[cfg(unix)]
+#[derive(Clone)]
+#[doc(alias = "sockaddr_un")]
+pub struct SocketAddrUnix {
+    pub(crate) unix: c::sockaddr_un,
+    #[cfg(not(any(bsd, target_os = "haiku")))]
+    len: c::socklen_t,
+}
+
+#[cfg(unix)]
+impl SocketAddrUnix {
+    /// Construct a new Unix-domain address from a filesystem path.
+    #[inline]
+    pub fn new<P: path::Arg>(path: P) -> io::Result<Self> {
+        path.into_with_c_str(Self::_new)
+    }
+
+    #[inline]
+    fn _new(path: &CStr) -> io::Result<Self> {
+        let mut unix = Self::init();
+        let mut bytes = path.to_bytes_with_nul();
+        if bytes.len() > unix.sun_path.len() {
+            bytes = path.to_bytes(); // without NUL
+            if bytes.len() > unix.sun_path.len() {
+                return Err(io::Errno::NAMETOOLONG);
+            }
+        }
+        for (i, b) in bytes.iter().enumerate() {
+            unix.sun_path[i] = *b as c::c_char;
+        }
+
+        #[cfg(any(bsd, target_os = "haiku"))]
+        {
+            unix.sun_len = (offsetof_sun_path() + bytes.len()).try_into().unwrap();
+        }
+
+        Ok(Self {
+            unix,
+            #[cfg(not(any(bsd, target_os = "haiku")))]
+            len: (offsetof_sun_path() + bytes.len()).try_into().unwrap(),
+        })
+    }
+
+    /// Construct a new abstract Unix-domain address from a byte slice.
+    #[cfg(linux_kernel)]
+    #[inline]
+    pub fn new_abstract_name(name: &[u8]) -> io::Result<Self> {
+        let mut unix = Self::init();
+        if 1 + name.len() > unix.sun_path.len() {
+            return Err(io::Errno::NAMETOOLONG);
+        }
+        unix.sun_path[0] = 0;
+        for (i, b) in name.iter().enumerate() {
+            unix.sun_path[1 + i] = *b as c::c_char;
+        }
+        let len = offsetof_sun_path() + 1 + name.len();
+        let len = len.try_into().unwrap();
+        Ok(Self {
+            unix,
+            #[cfg(not(any(bsd, target_os = "haiku")))]
+            len,
+        })
+    }
+
+    /// Construct a new unnamed address.
+    ///
+    /// The kernel will assign an abstract Unix-domain address to the socket
+    /// when you call [`bind`][crate::net::bind]. You can inspect the assigned
+    /// name with [`getsockname`][crate::net::getsockname].
+    ///
+    /// # References
+    ///  - [Linux]
+    ///
+    /// [Linux]: https://www.man7.org/linux/man-pages/man7/unix.7.html
+    #[cfg(linux_kernel)]
+    #[inline]
+    pub fn new_unnamed() -> Self {
+        Self {
+            unix: Self::init(),
+            #[cfg(not(any(bsd, target_os = "haiku")))]
+            len: offsetof_sun_path() as c::socklen_t,
+        }
+    }
+
+    const fn init() -> c::sockaddr_un {
+        c::sockaddr_un {
+            #[cfg(any(
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "horizon",
+                target_os = "nto",
+                target_os = "hurd",
+            ))]
+            sun_len: 0,
+            #[cfg(target_os = "vita")]
+            ss_len: 0,
+            sun_family: c::AF_UNIX as _,
+            #[cfg(any(bsd, target_os = "horizon", target_os = "nto"))]
+            sun_path: [0; 104],
+            #[cfg(not(any(
+                bsd,
+                target_os = "aix",
+                target_os = "haiku",
+                target_os = "horizon",
+                target_os = "nto"
+            )))]
+            sun_path: [0; 108],
+            #[cfg(target_os = "haiku")]
+            sun_path: [0; 126],
+            #[cfg(target_os = "aix")]
+            sun_path: [0; 1023],
+        }
+    }
+
+    /// For a filesystem path address, return the path.
+    #[inline]
+    #[cfg(feature = "alloc")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
+    pub fn path(&self) -> Option<Cow<'_, CStr>> {
+        let bytes = self.bytes()?;
+        if !bytes.is_empty() && bytes[0] != 0 {
+            if self.unix.sun_path.len() == bytes.len() {
+                // SAFETY: There are no NULs contained in bytes.
+                unsafe { Self::path_with_termination(bytes) }
+            } else {
+                // SAFETY: `from_bytes_with_nul_unchecked` since the string is
+                // NUL-terminated.
+                Some(unsafe { CStr::from_bytes_with_nul_unchecked(bytes) }.into())
+            }
+        } else {
+            None
+        }
+    }
+
+    /// If the `sun_path` field is not NUL-terminated, terminate it.
+    ///
+    /// SAFETY: The input `bytes` must not contain any NULs.
+    #[cfg(feature = "alloc")]
+    #[cold]
+    unsafe fn path_with_termination(bytes: &[u8]) -> Option<Cow<'_, CStr>> {
+        let mut owned = Vec::with_capacity(bytes.len() + 1);
+        owned.extend_from_slice(bytes);
+        owned.push(b'\0');
+        // SAFETY: `from_vec_with_nul_unchecked` since the string is
+        // NUL-terminated and `bytes` does not contain any NULs.
+        Some(Cow::Owned(
+            CString::from_vec_with_nul_unchecked(owned).into(),
+        ))
+    }
+
+    /// For a filesystem path address, return the path as a byte sequence,
+    /// excluding the NUL terminator.
+    #[inline]
+    pub fn path_bytes(&self) -> Option<&[u8]> {
+        let bytes = self.bytes()?;
+        if !bytes.is_empty() && bytes[0] != 0 {
+            if self.unix.sun_path.len() == self.len() - offsetof_sun_path() {
+                // There is no NUL terminator.
+                Some(bytes)
+            } else {
+                // Remove the NUL terminator.
+                Some(&bytes[..bytes.len() - 1])
+            }
+        } else {
+            None
+        }
+    }
+
+    /// For an abstract address, return the identifier.
+    #[cfg(linux_kernel)]
+    #[inline]
+    pub fn abstract_name(&self) -> Option<&[u8]> {
+        if let [0, bytes @ ..] = self.bytes()? {
+            Some(bytes)
+        } else {
+            None
+        }
+    }
+
+    /// `true` if the socket address is unnamed.
+    #[cfg(linux_kernel)]
+    #[inline]
+    pub fn is_unnamed(&self) -> bool {
+        self.bytes() == Some(&[])
+    }
+
+    #[inline]
+    pub(crate) fn addr_len(&self) -> SocketAddrLen {
+        #[cfg(not(any(bsd, target_os = "haiku")))]
+        {
+            bitcast!(self.len)
+        }
+        #[cfg(any(bsd, target_os = "haiku"))]
+        {
+            bitcast!(c::socklen_t::from(self.unix.sun_len))
+        }
+    }
+
+    #[inline]
+    pub(crate) fn len(&self) -> usize {
+        self.addr_len() as usize
+    }
+
+    #[inline]
+    fn bytes(&self) -> Option<&[u8]> {
+        let len = self.len();
+        if len != 0 {
+            let bytes = &self.unix.sun_path[..len - offsetof_sun_path()];
+            // SAFETY: `from_raw_parts` to convert from `&[c_char]` to `&[u8]`.
+            Some(unsafe { slice::from_raw_parts(bytes.as_ptr().cast(), bytes.len()) })
+        } else {
+            None
+        }
+    }
+}
+
+#[cfg(unix)]
+impl PartialEq for SocketAddrUnix {
+    #[inline]
+    fn eq(&self, other: &Self) -> bool {
+        let self_len = self.len() - offsetof_sun_path();
+        let other_len = other.len() - offsetof_sun_path();
+        self.unix.sun_path[..self_len].eq(&other.unix.sun_path[..other_len])
+    }
+}
+
+#[cfg(unix)]
+impl Eq for SocketAddrUnix {}
+
+#[cfg(unix)]
+impl PartialOrd for SocketAddrUnix {
+    #[inline]
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+#[cfg(unix)]
+impl Ord for SocketAddrUnix {
+    #[inline]
+    fn cmp(&self, other: &Self) -> Ordering {
+        let self_len = self.len() - offsetof_sun_path();
+        let other_len = other.len() - offsetof_sun_path();
+        self.unix.sun_path[..self_len].cmp(&other.unix.sun_path[..other_len])
+    }
+}
+
+#[cfg(unix)]
+impl Hash for SocketAddrUnix {
+    #[inline]
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        let self_len = self.len() - offsetof_sun_path();
+        self.unix.sun_path[..self_len].hash(state)
+    }
+}
+
+#[cfg(unix)]
+impl fmt::Debug for SocketAddrUnix {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        #[cfg(feature = "alloc")]
+        if let Some(path) = self.path() {
+            return path.fmt(f);
+        }
+        if let Some(bytes) = self.path_bytes() {
+            if let Ok(s) = core::str::from_utf8(bytes) {
+                return s.fmt(f);
+            }
+            return bytes.fmt(f);
+        }
+        #[cfg(linux_kernel)]
+        if let Some(name) = self.abstract_name() {
+            return name.fmt(f);
+        }
+        "(unnamed)".fmt(f)
+    }
+}
+
+/// `struct sockaddr_storage`
+///
+/// This type is guaranteed to be large enough to hold any encoded socket
+/// address.
+#[repr(transparent)]
+#[derive(Copy, Clone)]
+#[doc(alias = "sockaddr_storage")]
+pub struct SocketAddrStorage(c::sockaddr_storage);
+
+impl SocketAddrStorage {
+    /// Return a socket addr storage initialized to all zero bytes. The
+    /// `sa_family` is set to [`AddressFamily::UNSPEC`].
+    pub fn zeroed() -> Self {
+        assert_eq!(c::AF_UNSPEC, 0);
+        // SAFETY: `sockaddr_storage` is meant to be zero-initializable.
+        unsafe { core::mem::zeroed() }
+    }
+
+    /// Return the `sa_family` of this socket address.
+    pub fn family(&self) -> AddressFamily {
+        // SAFETY: `self.0` is a `sockaddr_storage` so it has enough space.
+        unsafe {
+            AddressFamily::from_raw(crate::backend::net::read_sockaddr::read_sa_family(
+                crate::utils::as_ptr(&self.0).cast::<c::sockaddr>(),
+            ))
+        }
+    }
+
+    /// Clear the `sa_family` of this socket address to
+    /// [`AddressFamily::UNSPEC`].
+    pub fn clear_family(&mut self) {
+        // SAFETY: `self.0` is a `sockaddr_storage` so it has enough space.
+        unsafe {
+            crate::backend::net::read_sockaddr::initialize_family_to_unspec(
+                crate::utils::as_mut_ptr(&mut self.0).cast::<c::sockaddr>(),
+            )
+        }
+    }
+}
+
+/// Return the offset of the `sun_path` field of `sockaddr_un`.
+#[cfg(not(windows))]
+#[inline]
+pub(crate) fn offsetof_sun_path() -> usize {
+    let z = c::sockaddr_un {
+        #[cfg(any(
+            bsd,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "horizon",
+            target_os = "hurd",
+            target_os = "nto",
+        ))]
+        sun_len: 0_u8,
+        #[cfg(target_os = "vita")]
+        ss_len: 0,
+        #[cfg(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "nto",
+            target_os = "vita"
+        ))]
+        sun_family: 0_u8,
+        #[cfg(not(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "nto",
+            target_os = "vita"
+        )))]
+        sun_family: 0_u16,
+        #[cfg(any(bsd, target_os = "horizon", target_os = "nto"))]
+        sun_path: [0; 104],
+        #[cfg(not(any(
+            bsd,
+            target_os = "aix",
+            target_os = "haiku",
+            target_os = "horizon",
+            target_os = "nto"
+        )))]
+        sun_path: [0; 108],
+        #[cfg(target_os = "haiku")]
+        sun_path: [0; 126],
+        #[cfg(target_os = "aix")]
+        sun_path: [0; 1023],
+    };
+    (crate::utils::as_ptr(&z.sun_path) as usize) - (crate::utils::as_ptr(&z) as usize)
+}
diff --git a/vendor/rustix/src/backend/libc/net/ext.rs b/vendor/rustix/src/backend/libc/net/ext.rs
new file mode 100644
index 00000000..efd2b31c
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/ext.rs
@@ -0,0 +1,137 @@
+use crate::backend::c;
+
+/// The windows `sockaddr_in6` type is a union with accessor functions which
+/// are not `const fn`. Define our own layout-compatible version so that we
+/// can transmute in and out of it.
+#[cfg(windows)]
+#[repr(C)]
+struct sockaddr_in6 {
+    sin6_family: u16,
+    sin6_port: u16,
+    sin6_flowinfo: u32,
+    sin6_addr: c::in6_addr,
+    sin6_scope_id: u32,
+}
+
+#[cfg(not(windows))]
+#[inline]
+pub(crate) const fn in_addr_s_addr(addr: c::in_addr) -> u32 {
+    addr.s_addr
+}
+
+#[cfg(windows)]
+#[inline]
+pub(crate) const fn in_addr_s_addr(addr: c::in_addr) -> u32 {
+    // This should be `*addr.S_un.S_addr()`, except that isn't a `const fn`.
+    unsafe { core::mem::transmute(addr) }
+}
+
+#[cfg(not(windows))]
+#[inline]
+pub(crate) const fn in_addr_new(s_addr: u32) -> c::in_addr {
+    c::in_addr { s_addr }
+}
+
+#[cfg(windows)]
+#[inline]
+pub(crate) const fn in_addr_new(s_addr: u32) -> c::in_addr {
+    unsafe { core::mem::transmute(s_addr) }
+}
+
+#[cfg(not(windows))]
+#[inline]
+pub(crate) const fn in6_addr_s6_addr(addr: c::in6_addr) -> [u8; 16] {
+    addr.s6_addr
+}
+
+#[cfg(windows)]
+#[inline]
+pub(crate) const fn in6_addr_s6_addr(addr: c::in6_addr) -> [u8; 16] {
+    unsafe { core::mem::transmute(addr) }
+}
+
+#[cfg(not(windows))]
+#[inline]
+pub(crate) const fn in6_addr_new(s6_addr: [u8; 16]) -> c::in6_addr {
+    c::in6_addr { s6_addr }
+}
+
+#[cfg(windows)]
+#[inline]
+pub(crate) const fn in6_addr_new(s6_addr: [u8; 16]) -> c::in6_addr {
+    unsafe { core::mem::transmute(s6_addr) }
+}
+
+#[cfg(not(windows))]
+#[inline]
+pub(crate) const fn sockaddr_in6_sin6_scope_id(addr: &c::sockaddr_in6) -> u32 {
+    addr.sin6_scope_id
+}
+
+#[cfg(windows)]
+#[inline]
+pub(crate) const fn sockaddr_in6_sin6_scope_id(addr: &c::sockaddr_in6) -> u32 {
+    let addr: &sockaddr_in6 = unsafe { core::mem::transmute(addr) };
+    addr.sin6_scope_id
+}
+
+#[cfg(not(windows))]
+#[inline]
+pub(crate) const fn sockaddr_in6_new(
+    #[cfg(any(
+        bsd,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "nto",
+        target_os = "vita"
+    ))]
+    sin6_len: u8,
+    sin6_family: c::sa_family_t,
+    sin6_port: u16,
+    sin6_flowinfo: u32,
+    sin6_addr: c::in6_addr,
+    sin6_scope_id: u32,
+) -> c::sockaddr_in6 {
+    c::sockaddr_in6 {
+        #[cfg(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "nto",
+            target_os = "vita"
+        ))]
+        sin6_len,
+        sin6_family,
+        sin6_port,
+        sin6_flowinfo,
+        sin6_addr,
+        sin6_scope_id,
+        #[cfg(solarish)]
+        __sin6_src_id: 0,
+        #[cfg(target_os = "vita")]
+        sin6_vport: 0,
+    }
+}
+
+#[cfg(windows)]
+#[inline]
+pub(crate) const fn sockaddr_in6_new(
+    sin6_family: u16,
+    sin6_port: u16,
+    sin6_flowinfo: u32,
+    sin6_addr: c::in6_addr,
+    sin6_scope_id: u32,
+) -> c::sockaddr_in6 {
+    let addr = sockaddr_in6 {
+        sin6_family,
+        sin6_port,
+        sin6_flowinfo,
+        sin6_addr,
+        sin6_scope_id,
+    };
+    unsafe { core::mem::transmute(addr) }
+}
diff --git a/vendor/rustix/src/backend/libc/net/mod.rs b/vendor/rustix/src/backend/libc/net/mod.rs
new file mode 100644
index 00000000..da7e1df8
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/mod.rs
@@ -0,0 +1,17 @@
+pub(crate) mod addr;
+pub(crate) mod ext;
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "horizon",
+    target_os = "redox",
+    target_os = "vita"
+)))]
+pub(crate) mod msghdr;
+#[cfg(linux_kernel)]
+pub(crate) mod netdevice;
+pub(crate) mod read_sockaddr;
+pub(crate) mod send_recv;
+pub(crate) mod sockopt;
+pub(crate) mod syscalls;
+pub(crate) mod write_sockaddr;
diff --git a/vendor/rustix/src/backend/libc/net/msghdr.rs b/vendor/rustix/src/backend/libc/net/msghdr.rs
new file mode 100644
index 00000000..fe5471b9
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/msghdr.rs
@@ -0,0 +1,188 @@
+//! Utilities for dealing with message headers.
+//!
+//! These take closures rather than returning a `c::msghdr` directly because
+//! the message headers may reference stack-local data.
+
+use crate::backend::c;
+
+use crate::io::{self, IoSlice, IoSliceMut};
+use crate::net::addr::SocketAddrArg;
+use crate::net::{RecvAncillaryBuffer, SendAncillaryBuffer, SocketAddrBuf};
+
+use core::mem::zeroed;
+
+/// Convert the value to the `msg_iovlen` field of a `msghdr` struct.
+#[cfg(all(
+    not(any(windows, target_os = "espidf", target_os = "wasi")),
+    any(
+        target_os = "android",
+        all(
+            target_os = "linux",
+            not(target_env = "musl"),
+            not(all(target_env = "uclibc", any(target_arch = "arm", target_arch = "mips")))
+        )
+    )
+))]
+#[inline]
+fn msg_iov_len(len: usize) -> c::size_t {
+    len
+}
+
+/// Convert the value to the `msg_iovlen` field of a `msghdr` struct.
+#[cfg(all(
+    not(any(
+        windows,
+        target_os = "espidf",
+        target_os = "redox",
+        target_os = "vita",
+        target_os = "wasi"
+    )),
+    not(any(
+        target_os = "android",
+        all(
+            target_os = "linux",
+            not(target_env = "musl"),
+            not(all(target_env = "uclibc", any(target_arch = "arm", target_arch = "mips")))
+        )
+    ))
+))]
+#[inline]
+fn msg_iov_len(len: usize) -> c::c_int {
+    len.try_into().unwrap_or(c::c_int::MAX)
+}
+
+/// Convert the value to a `socklen_t`.
+#[cfg(any(
+    bsd,
+    solarish,
+    target_env = "musl",
+    target_os = "aix",
+    target_os = "cygwin",
+    target_os = "emscripten",
+    target_os = "fuchsia",
+    target_os = "haiku",
+    target_os = "hurd",
+    target_os = "nto",
+))]
+#[inline]
+fn msg_control_len(len: usize) -> c::socklen_t {
+    len.try_into().unwrap_or(c::socklen_t::MAX)
+}
+
+/// Convert the value to a `size_t`.
+#[cfg(not(any(
+    bsd,
+    solarish,
+    windows,
+    target_env = "musl",
+    target_os = "aix",
+    target_os = "cygwin",
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "fuchsia",
+    target_os = "haiku",
+    target_os = "hurd",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi",
+)))]
+#[inline]
+fn msg_control_len(len: usize) -> c::size_t {
+    len
+}
+
+/// Create a message header intended to receive a datagram.
+///
+/// # Safety
+///
+/// If `f` dereferences the pointers in the `msghdr`, it must do so only within
+/// the bounds indicated by the associated lengths in the `msghdr`.
+///
+/// And, if `f` returns `Ok`, it must have updated the `msg_controllen` field
+/// of the `msghdr` to indicate how many bytes it initialized.
+pub(crate) unsafe fn with_recv_msghdr<R>(
+    name: &mut SocketAddrBuf,
+    iov: &mut [IoSliceMut<'_>],
+    control: &mut RecvAncillaryBuffer<'_>,
+    f: impl FnOnce(&mut c::msghdr) -> io::Result<R>,
+) -> io::Result<R> {
+    control.clear();
+
+    let mut msghdr = zero_msghdr();
+    msghdr.msg_name = name.storage.as_mut_ptr().cast();
+    msghdr.msg_namelen = name.len;
+    msghdr.msg_iov = iov.as_mut_ptr().cast();
+    msghdr.msg_iovlen = msg_iov_len(iov.len());
+    msghdr.msg_control = control.as_control_ptr().cast();
+    msghdr.msg_controllen = msg_control_len(control.control_len());
+
+    let res = f(&mut msghdr);
+
+    // Reset the control length.
+    if res.is_ok() {
+        // SAFETY: `f` returned `Ok`, so our safety condition requires `f` to
+        // have initialized `msg_controllen` bytes.
+        control.set_control_len(msghdr.msg_controllen as usize);
+    }
+
+    name.len = msghdr.msg_namelen;
+
+    res
+}
+
+/// Create a message header intended to send without an address.
+///
+/// The returned `msghdr` will contain raw pointers to the memory
+/// referenced by `iov` and `control`.
+pub(crate) fn noaddr_msghdr(
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+) -> c::msghdr {
+    let mut h = zero_msghdr();
+    h.msg_iov = iov.as_ptr() as _;
+    h.msg_iovlen = msg_iov_len(iov.len());
+    h.msg_control = control.as_control_ptr().cast();
+    h.msg_controllen = msg_control_len(control.control_len());
+    h
+}
+
+/// Create a message header intended to send with the specified address.
+///
+/// This creates a `c::msghdr` and calls a function `f` on it. The `msghdr`'s
+/// raw pointers may point to temporaries, so this function should avoid
+/// storing the pointers anywhere that would outlive the function call.
+///
+/// # Safety
+///
+/// If `f` dereferences the pointers in the `msghdr`, it must do so only within
+/// the bounds indicated by the associated lengths in the `msghdr`.
+pub(crate) unsafe fn with_msghdr<R>(
+    addr: &impl SocketAddrArg,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    f: impl FnOnce(&c::msghdr) -> R,
+) -> R {
+    addr.with_sockaddr(|addr_ptr, addr_len| {
+        let mut h = zero_msghdr();
+        h.msg_name = addr_ptr as *mut _;
+        h.msg_namelen = bitcast!(addr_len);
+        h.msg_iov = iov.as_ptr() as _;
+        h.msg_iovlen = msg_iov_len(iov.len());
+        h.msg_control = control.as_control_ptr().cast();
+        h.msg_controllen = msg_control_len(control.control_len());
+        // Pass a reference to the `c::msghdr` instead of passing it by value
+        // because it may contain pointers to temporary objects that won't
+        // live beyond the call to `with_sockaddr`.
+        f(&h)
+    })
+}
+
+/// Create a zero-initialized message header struct value.
+#[cfg(all(unix, not(target_os = "redox")))]
+pub(crate) fn zero_msghdr() -> c::msghdr {
+    // SAFETY: We can't initialize all the fields by value because on some
+    // platforms the `msghdr` struct in the libc crate contains private padding
+    // fields. But it is still a C type that's meant to be zero-initializable.
+    unsafe { zeroed() }
+}
diff --git a/vendor/rustix/src/backend/libc/net/netdevice.rs b/vendor/rustix/src/backend/libc/net/netdevice.rs
new file mode 100644
index 00000000..887f768d
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/netdevice.rs
@@ -0,0 +1,55 @@
+//! Wrappers for netdevice ioctls.
+
+#![allow(unsafe_code)]
+
+#[cfg(feature = "alloc")]
+use crate::alloc::string::String;
+use crate::backend::c;
+use crate::backend::io::syscalls::ioctl;
+use crate::fd::BorrowedFd;
+use crate::io;
+#[cfg(feature = "alloc")]
+use c::SIOCGIFNAME;
+use c::{__c_anonymous_ifr_ifru, c_char, ifreq, IFNAMSIZ, SIOCGIFINDEX};
+
+pub(crate) fn name_to_index(fd: BorrowedFd<'_>, if_name: &str) -> io::Result<u32> {
+    let if_name_bytes = if_name.as_bytes();
+    if if_name_bytes.len() >= IFNAMSIZ as usize {
+        return Err(io::Errno::NODEV);
+    }
+
+    let mut ifreq = ifreq {
+        ifr_name: [0; 16],
+        ifr_ifru: __c_anonymous_ifr_ifru { ifru_ifindex: 0 },
+    };
+
+    let mut if_name_c_char_iter = if_name_bytes.iter().map(|byte| *byte as c_char);
+    ifreq.ifr_name[..if_name_bytes.len()].fill_with(|| if_name_c_char_iter.next().unwrap());
+
+    unsafe { ioctl(fd, SIOCGIFINDEX as _, &mut ifreq as *mut ifreq as _) }?;
+    let index = unsafe { ifreq.ifr_ifru.ifru_ifindex };
+    Ok(index as u32)
+}
+
+#[cfg(feature = "alloc")]
+pub(crate) fn index_to_name(fd: BorrowedFd<'_>, index: u32) -> io::Result<String> {
+    let mut ifreq = ifreq {
+        ifr_name: [0; 16],
+        ifr_ifru: __c_anonymous_ifr_ifru {
+            ifru_ifindex: index as _,
+        },
+    };
+
+    unsafe { ioctl(fd, SIOCGIFNAME as _, &mut ifreq as *mut ifreq as _) }?;
+
+    if let Some(nul_byte) = ifreq.ifr_name.iter().position(|char| *char == 0) {
+        let name: String = ifreq.ifr_name[..nul_byte]
+            .iter()
+            .map(|v| *v as u8 as char)
+            .collect();
+
+        Ok(name)
+    } else {
+        Err(io::Errno::INVAL)
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/net/read_sockaddr.rs b/vendor/rustix/src/backend/libc/net/read_sockaddr.rs
new file mode 100644
index 00000000..5f8c48ec
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/read_sockaddr.rs
@@ -0,0 +1,264 @@
+//! The BSD sockets API requires us to read the `sa_family` field before we can
+//! interpret the rest of a `sockaddr` produced by the kernel.
+
+#[cfg(unix)]
+use super::addr::SocketAddrUnix;
+use super::ext::{in6_addr_s6_addr, in_addr_s_addr, sockaddr_in6_sin6_scope_id};
+use crate::backend::c;
+#[cfg(not(windows))]
+use crate::ffi::CStr;
+use crate::io::Errno;
+use crate::net::addr::SocketAddrLen;
+#[cfg(linux_kernel)]
+use crate::net::netlink::SocketAddrNetlink;
+#[cfg(target_os = "linux")]
+use crate::net::xdp::{SocketAddrXdp, SocketAddrXdpFlags};
+use crate::net::{AddressFamily, Ipv4Addr, Ipv6Addr, SocketAddrAny, SocketAddrV4, SocketAddrV6};
+use core::mem::size_of;
+
+// This must match the header of `sockaddr`.
+#[repr(C)]
+pub(crate) struct sockaddr_header {
+    #[cfg(any(
+        bsd,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita"
+    ))]
+    sa_len: u8,
+    #[cfg(any(
+        bsd,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita"
+    ))]
+    sa_family: u8,
+    #[cfg(not(any(
+        bsd,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "nto",
+        target_os = "vita"
+    )))]
+    sa_family: u16,
+}
+
+/// Read the `sa_family` field from a socket address returned from the OS.
+///
+/// # Safety
+///
+/// `storage` must point to a valid socket address returned from the OS.
+#[inline]
+pub(crate) unsafe fn read_sa_family(storage: *const c::sockaddr) -> u16 {
+    // Assert that we know the layout of `sockaddr`.
+    let _ = c::sockaddr {
+        #[cfg(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "nto",
+            target_os = "vita"
+        ))]
+        sa_len: 0_u8,
+        #[cfg(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "nto",
+            target_os = "vita"
+        ))]
+        sa_family: 0_u8,
+        #[cfg(not(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "nto",
+            target_os = "vita"
+        )))]
+        sa_family: 0_u16,
+        #[cfg(not(any(target_os = "haiku", target_os = "horizon")))]
+        sa_data: [0; 14],
+        #[cfg(target_os = "horizon")]
+        sa_data: [0; 26],
+        #[cfg(target_os = "haiku")]
+        sa_data: [0; 30],
+    };
+
+    (*storage.cast::<sockaddr_header>()).sa_family.into()
+}
+
+/// Read the first byte of the `sun_path` field, assuming we have an `AF_UNIX`
+/// socket address.
+#[cfg(apple)]
+#[inline]
+unsafe fn read_sun_path0(storage: *const c::sockaddr) -> u8 {
+    // In `read_sa_family` we assert that we know the layout of `sockaddr`.
+    storage
+        .cast::<u8>()
+        .add(super::addr::offsetof_sun_path())
+        .read()
+}
+
+/// Check if a socket address returned from the OS is considered non-empty.
+///
+/// # Safety
+///
+/// `storage` must point to a least an initialized `sockaddr_header`.
+#[inline]
+pub(crate) unsafe fn sockaddr_nonempty(storage: *const c::sockaddr, len: SocketAddrLen) -> bool {
+    if len == 0 {
+        return false;
+    }
+
+    assert!(len as usize >= size_of::<c::sa_family_t>());
+    let family: c::c_int = read_sa_family(storage.cast::<c::sockaddr>()).into();
+    if family == c::AF_UNSPEC {
+        return false;
+    }
+
+    // On macOS, if we get an `AF_UNIX` with an empty path, treat it as an
+    // absent address.
+    #[cfg(apple)]
+    if family == c::AF_UNIX && read_sun_path0(storage) == 0 {
+        return false;
+    }
+
+    true
+}
+
+/// Set the `sa_family` field of a socket address to `AF_UNSPEC`, so that we
+/// can test for `AF_UNSPEC` to test whether it was stored to.
+///
+/// # Safety
+///
+/// `storage` must point to a least an initialized `sockaddr_header`.
+pub(crate) unsafe fn initialize_family_to_unspec(storage: *mut c::sockaddr) {
+    (*storage.cast::<sockaddr_header>()).sa_family = c::AF_UNSPEC as _;
+}
+
+#[inline]
+pub(crate) fn read_sockaddr_v4(addr: &SocketAddrAny) -> Result<SocketAddrV4, Errno> {
+    if addr.address_family() != AddressFamily::INET {
+        return Err(Errno::AFNOSUPPORT);
+    }
+    assert!(addr.addr_len() as usize >= size_of::<c::sockaddr_in>());
+    let decode = unsafe { &*addr.as_ptr().cast::<c::sockaddr_in>() };
+    Ok(SocketAddrV4::new(
+        Ipv4Addr::from(u32::from_be(in_addr_s_addr(decode.sin_addr))),
+        u16::from_be(decode.sin_port),
+    ))
+}
+
+#[inline]
+pub(crate) fn read_sockaddr_v6(addr: &SocketAddrAny) -> Result<SocketAddrV6, Errno> {
+    if addr.address_family() != AddressFamily::INET6 {
+        return Err(Errno::AFNOSUPPORT);
+    }
+    assert!(addr.addr_len() as usize >= size_of::<c::sockaddr_in6>());
+    let decode = unsafe { &*addr.as_ptr().cast::<c::sockaddr_in6>() };
+    Ok(SocketAddrV6::new(
+        Ipv6Addr::from(in6_addr_s6_addr(decode.sin6_addr)),
+        u16::from_be(decode.sin6_port),
+        u32::from_be(decode.sin6_flowinfo),
+        sockaddr_in6_sin6_scope_id(decode),
+    ))
+}
+
+#[cfg(unix)]
+#[inline]
+pub(crate) fn read_sockaddr_unix(addr: &SocketAddrAny) -> Result<SocketAddrUnix, Errno> {
+    if addr.address_family() != AddressFamily::UNIX {
+        return Err(Errno::AFNOSUPPORT);
+    }
+
+    let offsetof_sun_path = super::addr::offsetof_sun_path();
+    let len = addr.addr_len() as usize;
+
+    assert!(len >= offsetof_sun_path);
+
+    if len == offsetof_sun_path {
+        SocketAddrUnix::new(&[][..])
+    } else {
+        let decode = unsafe { &*addr.as_ptr().cast::<c::sockaddr_un>() };
+
+        // On Linux check for Linux's [abstract namespace].
+        //
+        // [abstract namespace]: https://man7.org/linux/man-pages/man7/unix.7.html
+        #[cfg(linux_kernel)]
+        if decode.sun_path[0] == 0 {
+            let name = &decode.sun_path[1..len - offsetof_sun_path];
+            let name = unsafe { core::mem::transmute::<&[c::c_char], &[u8]>(name) };
+            return SocketAddrUnix::new_abstract_name(name);
+        }
+
+        // Otherwise we expect a NUL-terminated filesystem path.
+
+        // Trim off unused bytes from the end of `path_bytes`.
+        let path_bytes = if cfg!(any(solarish, target_os = "freebsd")) {
+            // FreeBSD and illumos sometimes set the length to longer
+            // than the length of the NUL-terminated string. Find the
+            // NUL and truncate the string accordingly.
+            &decode.sun_path[..decode
+                .sun_path
+                .iter()
+                .position(|b| *b == 0)
+                .ok_or(Errno::INVAL)?]
+        } else {
+            // Otherwise, use the provided length.
+            let provided_len = len - 1 - offsetof_sun_path;
+            if decode.sun_path[provided_len] != 0 {
+                return Err(Errno::INVAL);
+            }
+            debug_assert_eq!(
+                unsafe { CStr::from_ptr(decode.sun_path.as_ptr().cast()) }
+                    .to_bytes()
+                    .len(),
+                provided_len
+            );
+            &decode.sun_path[..provided_len]
+        };
+
+        SocketAddrUnix::new(unsafe { core::mem::transmute::<&[c::c_char], &[u8]>(path_bytes) })
+    }
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn read_sockaddr_xdp(addr: &SocketAddrAny) -> Result<SocketAddrXdp, Errno> {
+    if addr.address_family() != AddressFamily::XDP {
+        return Err(Errno::AFNOSUPPORT);
+    }
+    assert!(addr.addr_len() as usize >= size_of::<c::sockaddr_xdp>());
+    let decode = unsafe { &*addr.as_ptr().cast::<c::sockaddr_xdp>() };
+
+    // This ignores the `sxdp_shared_umem_fd` field, which is only expected to
+    // be significant in `bind` calls, and not returned from `acceptfrom` or
+    // `recvmsg` or similar.
+    Ok(SocketAddrXdp::new(
+        SocketAddrXdpFlags::from_bits_retain(decode.sxdp_flags),
+        u32::from_be(decode.sxdp_ifindex),
+        u32::from_be(decode.sxdp_queue_id),
+    ))
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn read_sockaddr_netlink(addr: &SocketAddrAny) -> Result<SocketAddrNetlink, Errno> {
+    if addr.address_family() != AddressFamily::NETLINK {
+        return Err(Errno::AFNOSUPPORT);
+    }
+    assert!(addr.addr_len() as usize >= size_of::<c::sockaddr_nl>());
+    let decode = unsafe { &*addr.as_ptr().cast::<c::sockaddr_nl>() };
+    Ok(SocketAddrNetlink::new(decode.nl_pid, decode.nl_groups))
+}
diff --git a/vendor/rustix/src/backend/libc/net/send_recv.rs b/vendor/rustix/src/backend/libc/net/send_recv.rs
new file mode 100644
index 00000000..4b67f2c5
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/send_recv.rs
@@ -0,0 +1,153 @@
+use crate::backend::c;
+use bitflags::bitflags;
+
+bitflags! {
+    /// `MSG_*` flags for use with [`send`], [`sendto`], and related
+    /// functions.
+    ///
+    /// [`send`]: crate::net::send
+    /// [`sendto`]: crate::net::sendto
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct SendFlags: u32 {
+        /// `MSG_CONFIRM`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            windows,
+            target_os = "aix",
+            target_os = "cygwin",
+            target_os = "espidf",
+            target_os = "nto",
+            target_os = "haiku",
+            target_os = "horizon",
+            target_os = "hurd",
+            target_os = "redox",
+            target_os = "vita",
+        )))]
+        const CONFIRM = bitcast!(c::MSG_CONFIRM);
+        /// `MSG_DONTROUTE`
+        const DONTROUTE = bitcast!(c::MSG_DONTROUTE);
+        /// `MSG_DONTWAIT`
+        #[cfg(not(windows))]
+        const DONTWAIT = bitcast!(c::MSG_DONTWAIT);
+        /// `MSG_EOR`
+        #[cfg(not(any(windows, target_os = "horizon")))]
+        const EOR = bitcast!(c::MSG_EOR);
+        /// `MSG_MORE`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            windows,
+            target_os = "aix",
+            target_os = "cygwin",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "nto",
+            target_os = "redox",
+            target_os = "vita",
+        )))]
+        const MORE = bitcast!(c::MSG_MORE);
+        #[cfg(not(any(apple, windows, target_os = "redox", target_os = "vita")))]
+        /// `MSG_NOSIGNAL`
+        const NOSIGNAL = bitcast!(c::MSG_NOSIGNAL);
+        /// `MSG_OOB`
+        const OOB = bitcast!(c::MSG_OOB);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MSG_*` flags for use with [`recv`], [`recvfrom`], and related
+    /// functions.
+    ///
+    /// [`recv`]: crate::net::recv
+    /// [`recvfrom`]: crate::net::recvfrom
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct RecvFlags: u32 {
+        /// `MSG_CMSG_CLOEXEC`
+        #[cfg(not(any(
+            apple,
+            solarish,
+            windows,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "horizon",
+            target_os = "nto",
+            target_os = "redox",
+            target_os = "vita",
+        )))]
+        const CMSG_CLOEXEC = bitcast!(c::MSG_CMSG_CLOEXEC);
+        /// `MSG_DONTWAIT`
+        #[cfg(not(windows))]
+        const DONTWAIT = bitcast!(c::MSG_DONTWAIT);
+        /// `MSG_ERRQUEUE`
+        #[cfg(not(any(
+            bsd,
+            solarish,
+            windows,
+            target_os = "aix",
+            target_os = "cygwin",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "horizon",
+            target_os = "hurd",
+            target_os = "nto",
+            target_os = "redox",
+            target_os = "vita",
+        )))]
+        const ERRQUEUE = bitcast!(c::MSG_ERRQUEUE);
+        /// `MSG_OOB`
+        const OOB = bitcast!(c::MSG_OOB);
+        /// `MSG_PEEK`
+        const PEEK = bitcast!(c::MSG_PEEK);
+        /// `MSG_TRUNC`
+        // Apple, illumos, and NetBSD have `MSG_TRUNC` but it's not documented
+        // for use with `recv` and friends, and in practice appears to be
+        // ignored.
+        #[cfg(not(any(apple, solarish, target_os = "horizon", target_os = "netbsd")))]
+        const TRUNC = bitcast!(c::MSG_TRUNC);
+        /// `MSG_WAITALL`
+        const WAITALL = bitcast!(c::MSG_WAITALL);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
+
+bitflags! {
+    /// `MSG_*` flags returned from [`recvmsg`], in the `flags` field of
+    /// [`RecvMsg`]
+    ///
+    /// [`recvmsg`]: crate::net::recvmsg
+    /// [`RecvMsg`]: crate::net::RecvMsg
+    #[repr(transparent)]
+    #[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+    pub struct ReturnFlags: u32 {
+        /// `MSG_OOB`
+        const OOB = bitcast!(c::MSG_OOB);
+        /// `MSG_EOR`
+        #[cfg(not(any(windows, target_os = "horizon")))]
+        const EOR = bitcast!(c::MSG_EOR);
+        /// `MSG_TRUNC`
+        #[cfg(not(target_os = "horizon"))]
+        const TRUNC = bitcast!(c::MSG_TRUNC);
+        /// `MSG_CTRUNC`
+        #[cfg(not(target_os = "horizon"))]
+        const CTRUNC = bitcast!(c::MSG_CTRUNC);
+
+        /// `MSG_CMSG_CLOEXEC`
+        #[cfg(linux_kernel)]
+        const CMSG_CLOEXEC = bitcast!(c::MSG_CMSG_CLOEXEC);
+        /// `MSG_ERRQUEUE`
+        #[cfg(linux_kernel)]
+        const ERRQUEUE = bitcast!(c::MSG_ERRQUEUE);
+
+        /// <https://docs.rs/bitflags/*/bitflags/#externally-defined-flags>
+        const _ = !0;
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/net/sockopt.rs b/vendor/rustix/src/backend/libc/net/sockopt.rs
new file mode 100644
index 00000000..132ebe75
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/sockopt.rs
@@ -0,0 +1,1339 @@
+//! libc syscalls supporting `rustix::net::sockopt`.
+
+use super::ext::{in6_addr_new, in_addr_new};
+use crate::backend::c;
+use crate::backend::conv::{borrowed_fd, ret};
+use crate::fd::BorrowedFd;
+#[cfg(feature = "alloc")]
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+use crate::ffi::CStr;
+use crate::io;
+use crate::net::sockopt::Timeout;
+#[cfg(target_os = "linux")]
+use crate::net::xdp::{XdpMmapOffsets, XdpOptionsFlags, XdpRingOffset, XdpStatistics, XdpUmemReg};
+#[cfg(not(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "cygwin",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "vita",
+)))]
+use crate::net::AddressFamily;
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_env = "newlib"
+))]
+use crate::net::Protocol;
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_env = "newlib"
+))]
+use crate::net::RawProtocol;
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+use crate::net::SocketAddrV4;
+use crate::net::{Ipv4Addr, Ipv6Addr, SocketType};
+#[cfg(linux_kernel)]
+use crate::net::{SocketAddrV6, UCred};
+use crate::utils::as_mut_ptr;
+#[cfg(feature = "alloc")]
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+use alloc::borrow::ToOwned as _;
+#[cfg(feature = "alloc")]
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+use alloc::string::String;
+#[cfg(apple)]
+use c::TCP_KEEPALIVE as TCP_KEEPIDLE;
+#[cfg(not(any(apple, target_os = "haiku", target_os = "nto", target_os = "openbsd")))]
+use c::TCP_KEEPIDLE;
+use core::mem::{size_of, MaybeUninit};
+use core::time::Duration;
+#[cfg(target_os = "linux")]
+use linux_raw_sys::xdp::{xdp_mmap_offsets, xdp_statistics, xdp_statistics_v1};
+#[cfg(windows)]
+use windows_sys::Win32::Foundation::BOOL;
+
+#[inline]
+fn getsockopt<T: Copy>(fd: BorrowedFd<'_>, level: i32, optname: i32) -> io::Result<T> {
+    let mut optlen = size_of::<T>().try_into().unwrap();
+    debug_assert!(
+        optlen as usize >= size_of::<c::c_int>(),
+        "Socket APIs don't ever use `bool` directly"
+    );
+
+    let mut value = MaybeUninit::<T>::zeroed();
+    getsockopt_raw(fd, level, optname, &mut value, &mut optlen)?;
+
+    // On Windows at least, `getsockopt` has been observed writing 1
+    // byte on at least (`IPPROTO_TCP`, `TCP_NODELAY`), even though
+    // Windows' documentation says that should write a 4-byte `BOOL`.
+    // So, we initialize the memory to zeros above, and just assert
+    // that `getsockopt` doesn't write too many bytes here.
+    assert!(
+        optlen as usize <= size_of::<T>(),
+        "unexpected getsockopt size"
+    );
+
+    unsafe { Ok(value.assume_init()) }
+}
+
+#[inline]
+fn getsockopt_raw<T>(
+    fd: BorrowedFd<'_>,
+    level: i32,
+    optname: i32,
+    value: &mut MaybeUninit<T>,
+    optlen: &mut c::socklen_t,
+) -> io::Result<()> {
+    unsafe {
+        ret(c::getsockopt(
+            borrowed_fd(fd),
+            level,
+            optname,
+            as_mut_ptr(value).cast(),
+            optlen,
+        ))
+    }
+}
+
+#[inline]
+fn setsockopt<T: Copy>(fd: BorrowedFd<'_>, level: i32, optname: i32, value: T) -> io::Result<()> {
+    let optlen = size_of::<T>().try_into().unwrap();
+    debug_assert!(
+        optlen as usize >= size_of::<c::c_int>(),
+        "Socket APIs don't ever use `bool` directly"
+    );
+    setsockopt_raw(fd, level, optname, &value, optlen)
+}
+
+#[inline]
+fn setsockopt_raw<T>(
+    fd: BorrowedFd<'_>,
+    level: i32,
+    optname: i32,
+    ptr: *const T,
+    optlen: c::socklen_t,
+) -> io::Result<()> {
+    unsafe {
+        ret(c::setsockopt(
+            borrowed_fd(fd),
+            level,
+            optname,
+            ptr.cast(),
+            optlen,
+        ))
+    }
+}
+
+#[inline]
+pub(crate) fn socket_type(fd: BorrowedFd<'_>) -> io::Result<SocketType> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_TYPE)
+}
+
+#[inline]
+pub(crate) fn set_socket_reuseaddr(fd: BorrowedFd<'_>, reuseaddr: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_REUSEADDR, from_bool(reuseaddr))
+}
+
+#[inline]
+pub(crate) fn socket_reuseaddr(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_REUSEADDR).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_broadcast(fd: BorrowedFd<'_>, broadcast: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_BROADCAST, from_bool(broadcast))
+}
+
+#[inline]
+pub(crate) fn socket_broadcast(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_BROADCAST).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_linger(fd: BorrowedFd<'_>, linger: Option<Duration>) -> io::Result<()> {
+    // Convert `linger` to seconds, rounding up.
+    let l_linger = if let Some(linger) = linger {
+        duration_to_secs(linger)?
+    } else {
+        0
+    };
+    let linger = c::linger {
+        l_onoff: linger.is_some().into(),
+        l_linger,
+    };
+    setsockopt(fd, c::SOL_SOCKET, c::SO_LINGER, linger)
+}
+
+#[inline]
+pub(crate) fn socket_linger(fd: BorrowedFd<'_>) -> io::Result<Option<Duration>> {
+    let linger: c::linger = getsockopt(fd, c::SOL_SOCKET, c::SO_LINGER)?;
+    Ok((linger.l_onoff != 0).then(|| Duration::from_secs(linger.l_linger as u64)))
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn set_socket_passcred(fd: BorrowedFd<'_>, passcred: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_PASSCRED, from_bool(passcred))
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn socket_passcred(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_PASSCRED).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_timeout(
+    fd: BorrowedFd<'_>,
+    id: Timeout,
+    timeout: Option<Duration>,
+) -> io::Result<()> {
+    let optname = match id {
+        Timeout::Recv => c::SO_RCVTIMEO,
+        Timeout::Send => c::SO_SNDTIMEO,
+    };
+
+    #[cfg(not(windows))]
+    let timeout = match timeout {
+        Some(timeout) => {
+            if timeout == Duration::ZERO {
+                return Err(io::Errno::INVAL);
+            }
+
+            // Rust's musl libc bindings deprecated `time_t` while they
+            // transition to 64-bit `time_t`. What we want here is just
+            // “whatever type `timeval`'s `tv_sec` is”, so we're ok using
+            // the deprecated type.
+            #[allow(deprecated)]
+            let tv_sec = timeout.as_secs().try_into().unwrap_or(c::time_t::MAX);
+
+            // `subsec_micros` rounds down, so we use `subsec_nanos` and
+            // manually round up.
+            let mut timeout = c::timeval {
+                tv_sec,
+                tv_usec: ((timeout.subsec_nanos() + 999) / 1000) as _,
+            };
+            if timeout.tv_sec == 0 && timeout.tv_usec == 0 {
+                timeout.tv_usec = 1;
+            }
+            timeout
+        }
+        None => c::timeval {
+            tv_sec: 0,
+            tv_usec: 0,
+        },
+    };
+
+    #[cfg(windows)]
+    let timeout: u32 = match timeout {
+        Some(timeout) => {
+            if timeout == Duration::ZERO {
+                return Err(io::Errno::INVAL);
+            }
+
+            // `as_millis` rounds down, so we use `as_nanos` and
+            // manually round up.
+            let mut timeout: u32 = ((timeout.as_nanos() + 999_999) / 1_000_000)
+                .try_into()
+                .map_err(|_convert_err| io::Errno::INVAL)?;
+            if timeout == 0 {
+                timeout = 1;
+            }
+            timeout
+        }
+        None => 0,
+    };
+
+    setsockopt(fd, c::SOL_SOCKET, optname, timeout)
+}
+
+#[inline]
+pub(crate) fn socket_timeout(fd: BorrowedFd<'_>, id: Timeout) -> io::Result<Option<Duration>> {
+    let optname = match id {
+        Timeout::Recv => c::SO_RCVTIMEO,
+        Timeout::Send => c::SO_SNDTIMEO,
+    };
+
+    #[cfg(not(windows))]
+    {
+        let timeout: c::timeval = getsockopt(fd, c::SOL_SOCKET, optname)?;
+        if timeout.tv_sec == 0 && timeout.tv_usec == 0 {
+            Ok(None)
+        } else {
+            Ok(Some(
+                Duration::from_secs(timeout.tv_sec as u64)
+                    + Duration::from_micros(timeout.tv_usec as u64),
+            ))
+        }
+    }
+
+    #[cfg(windows)]
+    {
+        let timeout: u32 = getsockopt(fd, c::SOL_SOCKET, optname)?;
+        if timeout == 0 {
+            Ok(None)
+        } else {
+            Ok(Some(Duration::from_millis(timeout as u64)))
+        }
+    }
+}
+
+#[cfg(any(apple, freebsdlike, target_os = "netbsd"))]
+#[inline]
+pub(crate) fn socket_nosigpipe(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_NOSIGPIPE).map(to_bool)
+}
+
+#[cfg(any(apple, freebsdlike, target_os = "netbsd"))]
+#[inline]
+pub(crate) fn set_socket_nosigpipe(fd: BorrowedFd<'_>, val: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_NOSIGPIPE, from_bool(val))
+}
+
+#[inline]
+pub(crate) fn socket_error(fd: BorrowedFd<'_>) -> io::Result<Result<(), io::Errno>> {
+    let err: c::c_int = getsockopt(fd, c::SOL_SOCKET, c::SO_ERROR)?;
+    Ok(if err == 0 {
+        Ok(())
+    } else {
+        Err(io::Errno::from_raw_os_error(err))
+    })
+}
+
+#[inline]
+pub(crate) fn set_socket_keepalive(fd: BorrowedFd<'_>, keepalive: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_KEEPALIVE, from_bool(keepalive))
+}
+
+#[inline]
+pub(crate) fn socket_keepalive(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_KEEPALIVE).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_recv_buffer_size(fd: BorrowedFd<'_>, size: usize) -> io::Result<()> {
+    let size: c::c_int = size.try_into().map_err(|_| io::Errno::INVAL)?;
+    setsockopt(fd, c::SOL_SOCKET, c::SO_RCVBUF, size)
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia", target_os = "redox"))]
+#[inline]
+pub(crate) fn set_socket_recv_buffer_size_force(fd: BorrowedFd<'_>, size: usize) -> io::Result<()> {
+    let size: c::c_int = size.try_into().map_err(|_| io::Errno::INVAL)?;
+    setsockopt(fd, c::SOL_SOCKET, c::SO_RCVBUFFORCE, size)
+}
+
+#[inline]
+pub(crate) fn socket_recv_buffer_size(fd: BorrowedFd<'_>) -> io::Result<usize> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_RCVBUF).map(|size: u32| size as usize)
+}
+
+#[inline]
+pub(crate) fn set_socket_send_buffer_size(fd: BorrowedFd<'_>, size: usize) -> io::Result<()> {
+    let size: c::c_int = size.try_into().map_err(|_| io::Errno::INVAL)?;
+    setsockopt(fd, c::SOL_SOCKET, c::SO_SNDBUF, size)
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia", target_os = "redox"))]
+#[inline]
+pub(crate) fn set_socket_send_buffer_size_force(fd: BorrowedFd<'_>, size: usize) -> io::Result<()> {
+    let size: c::c_int = size.try_into().map_err(|_| io::Errno::INVAL)?;
+    setsockopt(fd, c::SOL_SOCKET, c::SO_SNDBUFFORCE, size)
+}
+
+#[inline]
+pub(crate) fn socket_send_buffer_size(fd: BorrowedFd<'_>) -> io::Result<usize> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_SNDBUF).map(|size: u32| size as usize)
+}
+
+#[inline]
+#[cfg(not(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "cygwin",
+    target_os = "dragonfly",
+    target_os = "emscripten",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "horizon",
+    target_os = "hurd",
+    target_os = "netbsd",
+    target_os = "nto",
+    target_os = "vita",
+)))]
+pub(crate) fn socket_domain(fd: BorrowedFd<'_>) -> io::Result<AddressFamily> {
+    let domain: c::c_int = getsockopt(fd, c::SOL_SOCKET, c::SO_DOMAIN)?;
+    Ok(AddressFamily(
+        domain.try_into().map_err(|_| io::Errno::OPNOTSUPP)?,
+    ))
+}
+
+#[inline]
+#[cfg(not(apple))] // Apple platforms declare the constant, but do not actually implement it.
+pub(crate) fn socket_acceptconn(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_ACCEPTCONN).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_socket_oobinline(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_OOBINLINE, from_bool(value))
+}
+
+#[inline]
+pub(crate) fn socket_oobinline(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_OOBINLINE).map(to_bool)
+}
+
+#[cfg(not(any(solarish, windows, target_os = "cygwin")))]
+#[inline]
+pub(crate) fn set_socket_reuseport(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_REUSEPORT, from_bool(value))
+}
+
+#[cfg(not(any(solarish, windows, target_os = "cygwin")))]
+#[inline]
+pub(crate) fn socket_reuseport(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_REUSEPORT).map(to_bool)
+}
+
+#[cfg(target_os = "freebsd")]
+#[inline]
+pub(crate) fn set_socket_reuseport_lb(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_REUSEPORT_LB, from_bool(value))
+}
+
+#[cfg(target_os = "freebsd")]
+#[inline]
+pub(crate) fn socket_reuseport_lb(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_REUSEPORT_LB).map(to_bool)
+}
+
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_env = "newlib"
+))]
+#[inline]
+pub(crate) fn socket_protocol(fd: BorrowedFd<'_>) -> io::Result<Option<Protocol>> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_PROTOCOL)
+        .map(|raw| RawProtocol::new(raw).map(Protocol::from_raw))
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn socket_cookie(fd: BorrowedFd<'_>) -> io::Result<u64> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_COOKIE)
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn socket_incoming_cpu(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_INCOMING_CPU)
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn set_socket_incoming_cpu(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::SOL_SOCKET, c::SO_INCOMING_CPU, value)
+}
+
+#[inline]
+pub(crate) fn set_ip_ttl(fd: BorrowedFd<'_>, ttl: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_TTL, ttl)
+}
+
+#[inline]
+pub(crate) fn ip_ttl(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_TTL)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_v6only(fd: BorrowedFd<'_>, only_v6: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_V6ONLY, from_bool(only_v6))
+}
+
+#[inline]
+pub(crate) fn ipv6_v6only(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_V6ONLY).map(to_bool)
+}
+
+#[cfg(any(linux_kernel, target_os = "cygwin"))]
+#[inline]
+pub(crate) fn ip_mtu(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_MTU)
+}
+
+#[cfg(any(linux_kernel, target_os = "cygwin"))]
+#[inline]
+pub(crate) fn ipv6_mtu(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_MTU)
+}
+
+#[inline]
+pub(crate) fn set_ip_multicast_if(fd: BorrowedFd<'_>, value: &Ipv4Addr) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_MULTICAST_IF, to_imr_addr(value))
+}
+
+#[inline]
+pub(crate) fn ip_multicast_if(fd: BorrowedFd<'_>) -> io::Result<Ipv4Addr> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_MULTICAST_IF).map(from_in_addr)
+}
+
+#[cfg(any(
+    apple,
+    freebsdlike,
+    linux_like,
+    target_os = "fuchsia",
+    target_os = "openbsd"
+))]
+#[inline]
+pub(crate) fn set_ip_multicast_if_with_ifindex(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    address: &Ipv4Addr,
+    ifindex: u32,
+) -> io::Result<()> {
+    let mreqn = to_ip_mreqn(multiaddr, address, ifindex as i32);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_MULTICAST_IF, mreqn)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_multicast_if(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_MULTICAST_IF, value as c::c_int)
+}
+
+#[inline]
+pub(crate) fn ipv6_multicast_if(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_MULTICAST_IF)
+}
+
+#[inline]
+pub(crate) fn set_ip_multicast_loop(fd: BorrowedFd<'_>, multicast_loop: bool) -> io::Result<()> {
+    setsockopt(
+        fd,
+        c::IPPROTO_IP,
+        c::IP_MULTICAST_LOOP,
+        from_bool(multicast_loop),
+    )
+}
+
+#[inline]
+pub(crate) fn ip_multicast_loop(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_MULTICAST_LOOP).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_ip_multicast_ttl(fd: BorrowedFd<'_>, multicast_ttl: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_MULTICAST_TTL, multicast_ttl)
+}
+
+#[inline]
+pub(crate) fn ip_multicast_ttl(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_MULTICAST_TTL)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_multicast_loop(fd: BorrowedFd<'_>, multicast_loop: bool) -> io::Result<()> {
+    setsockopt(
+        fd,
+        c::IPPROTO_IPV6,
+        c::IPV6_MULTICAST_LOOP,
+        from_bool(multicast_loop),
+    )
+}
+
+#[inline]
+pub(crate) fn ipv6_multicast_loop(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_MULTICAST_LOOP).map(to_bool)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_multicast_hops(fd: BorrowedFd<'_>, multicast_hops: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IPV6_MULTICAST_HOPS, multicast_hops)
+}
+
+#[inline]
+pub(crate) fn ipv6_multicast_hops(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IP, c::IPV6_MULTICAST_HOPS)
+}
+
+#[inline]
+pub(crate) fn set_ip_add_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+) -> io::Result<()> {
+    let mreq = to_ip_mreq(multiaddr, interface);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_ADD_MEMBERSHIP, mreq)
+}
+
+#[cfg(any(
+    apple,
+    freebsdlike,
+    linux_like,
+    target_os = "fuchsia",
+    target_os = "openbsd"
+))]
+#[inline]
+pub(crate) fn set_ip_add_membership_with_ifindex(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    address: &Ipv4Addr,
+    ifindex: u32,
+) -> io::Result<()> {
+    let mreqn = to_ip_mreqn(multiaddr, address, ifindex as i32);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_ADD_MEMBERSHIP, mreqn)
+}
+
+#[cfg(any(apple, freebsdlike, linux_like, solarish, target_os = "aix"))]
+#[inline]
+pub(crate) fn set_ip_add_source_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> io::Result<()> {
+    let mreq_source = to_imr_source(multiaddr, interface, sourceaddr);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_ADD_SOURCE_MEMBERSHIP, mreq_source)
+}
+
+#[cfg(any(apple, freebsdlike, linux_like, solarish, target_os = "aix"))]
+#[inline]
+pub(crate) fn set_ip_drop_source_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> io::Result<()> {
+    let mreq_source = to_imr_source(multiaddr, interface, sourceaddr);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_DROP_SOURCE_MEMBERSHIP, mreq_source)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_add_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv6Addr,
+    interface: u32,
+) -> io::Result<()> {
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "nto"
+    )))]
+    use c::IPV6_ADD_MEMBERSHIP;
+    #[cfg(any(
+        bsd,
+        solarish,
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "nto"
+    ))]
+    use c::IPV6_JOIN_GROUP as IPV6_ADD_MEMBERSHIP;
+
+    let mreq = to_ipv6mr(multiaddr, interface);
+    setsockopt(fd, c::IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, mreq)
+}
+
+#[inline]
+pub(crate) fn set_ip_drop_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+) -> io::Result<()> {
+    let mreq = to_ip_mreq(multiaddr, interface);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_DROP_MEMBERSHIP, mreq)
+}
+
+#[cfg(any(
+    apple,
+    freebsdlike,
+    linux_like,
+    target_os = "fuchsia",
+    target_os = "openbsd"
+))]
+#[inline]
+pub(crate) fn set_ip_drop_membership_with_ifindex(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv4Addr,
+    address: &Ipv4Addr,
+    ifindex: u32,
+) -> io::Result<()> {
+    let mreqn = to_ip_mreqn(multiaddr, address, ifindex as i32);
+    setsockopt(fd, c::IPPROTO_IP, c::IP_DROP_MEMBERSHIP, mreqn)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_drop_membership(
+    fd: BorrowedFd<'_>,
+    multiaddr: &Ipv6Addr,
+    interface: u32,
+) -> io::Result<()> {
+    #[cfg(not(any(
+        bsd,
+        solarish,
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "nto"
+    )))]
+    use c::IPV6_DROP_MEMBERSHIP;
+    #[cfg(any(
+        bsd,
+        solarish,
+        target_os = "haiku",
+        target_os = "l4re",
+        target_os = "nto"
+    ))]
+    use c::IPV6_LEAVE_GROUP as IPV6_DROP_MEMBERSHIP;
+
+    let mreq = to_ipv6mr(multiaddr, interface);
+    setsockopt(fd, c::IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, mreq)
+}
+
+#[inline]
+pub(crate) fn ipv6_unicast_hops(fd: BorrowedFd<'_>) -> io::Result<u8> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_UNICAST_HOPS).map(|hops: c::c_int| hops as u8)
+}
+
+#[inline]
+pub(crate) fn set_ipv6_unicast_hops(fd: BorrowedFd<'_>, hops: Option<u8>) -> io::Result<()> {
+    let hops = match hops {
+        Some(hops) => hops as c::c_int,
+        None => -1,
+    };
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_UNICAST_HOPS, hops)
+}
+
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "haiku",
+    target_os = "nto",
+    target_env = "newlib"
+))]
+#[inline]
+pub(crate) fn set_ip_tos(fd: BorrowedFd<'_>, value: u8) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_TOS, i32::from(value))
+}
+
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "haiku",
+    target_os = "nto",
+    target_env = "newlib"
+))]
+#[inline]
+pub(crate) fn ip_tos(fd: BorrowedFd<'_>) -> io::Result<u8> {
+    let value: i32 = getsockopt(fd, c::IPPROTO_IP, c::IP_TOS)?;
+    Ok(value as u8)
+}
+
+#[cfg(any(
+    apple,
+    linux_like,
+    target_os = "cygwin",
+    target_os = "freebsd",
+    target_os = "fuchsia",
+))]
+#[inline]
+pub(crate) fn set_ip_recvtos(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_RECVTOS, from_bool(value))
+}
+
+#[cfg(any(
+    apple,
+    linux_like,
+    target_os = "cygwin",
+    target_os = "freebsd",
+    target_os = "fuchsia",
+))]
+#[inline]
+pub(crate) fn ip_recvtos(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_RECVTOS).map(to_bool)
+}
+
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "nto"
+))]
+#[inline]
+pub(crate) fn set_ipv6_recvtclass(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_RECVTCLASS, from_bool(value))
+}
+
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "nto"
+))]
+#[inline]
+pub(crate) fn ipv6_recvtclass(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_RECVTCLASS).map(to_bool)
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn set_ip_freebind(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IP, c::IP_FREEBIND, from_bool(value))
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn ip_freebind(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IP, c::IP_FREEBIND).map(to_bool)
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn set_ipv6_freebind(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_FREEBIND, from_bool(value))
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn ipv6_freebind(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_FREEBIND).map(to_bool)
+}
+
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn ip_original_dst(fd: BorrowedFd<'_>) -> io::Result<SocketAddrV4> {
+    let level = c::IPPROTO_IP;
+    let optname = c::SO_ORIGINAL_DST;
+
+    let mut addr = crate::net::SocketAddrBuf::new();
+    getsockopt_raw(fd, level, optname, &mut addr.storage, &mut addr.len)?;
+    Ok(unsafe { addr.into_any() }.try_into().unwrap())
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn ipv6_original_dst(fd: BorrowedFd<'_>) -> io::Result<SocketAddrV6> {
+    let level = c::IPPROTO_IPV6;
+    let optname = c::IP6T_SO_ORIGINAL_DST;
+
+    let mut addr = crate::net::SocketAddrBuf::new();
+    getsockopt_raw(fd, level, optname, &mut addr.storage, &mut addr.len)?;
+    Ok(unsafe { addr.into_any() }.try_into().unwrap())
+}
+
+#[cfg(not(any(
+    solarish,
+    windows,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "horizon",
+    target_os = "redox",
+    target_os = "vita"
+)))]
+#[inline]
+pub(crate) fn set_ipv6_tclass(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_IPV6, c::IPV6_TCLASS, value)
+}
+
+#[cfg(not(any(
+    solarish,
+    windows,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "horizon",
+    target_os = "redox",
+    target_os = "vita"
+)))]
+#[inline]
+pub(crate) fn ipv6_tclass(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_IPV6, c::IPV6_TCLASS)
+}
+
+#[inline]
+pub(crate) fn set_tcp_nodelay(fd: BorrowedFd<'_>, nodelay: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_NODELAY, from_bool(nodelay))
+}
+
+#[inline]
+pub(crate) fn tcp_nodelay(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_NODELAY).map(to_bool)
+}
+
+#[inline]
+#[cfg(not(any(
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "openbsd",
+    target_os = "redox"
+)))]
+pub(crate) fn set_tcp_keepcnt(fd: BorrowedFd<'_>, count: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPCNT, count)
+}
+
+#[inline]
+#[cfg(not(any(
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "openbsd",
+    target_os = "redox"
+)))]
+pub(crate) fn tcp_keepcnt(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPCNT)
+}
+
+#[inline]
+#[cfg(not(any(target_os = "haiku", target_os = "nto", target_os = "openbsd")))]
+pub(crate) fn set_tcp_keepidle(fd: BorrowedFd<'_>, duration: Duration) -> io::Result<()> {
+    let secs: c::c_uint = duration_to_secs(duration)?;
+    setsockopt(fd, c::IPPROTO_TCP, TCP_KEEPIDLE, secs)
+}
+
+#[inline]
+#[cfg(not(any(target_os = "haiku", target_os = "nto", target_os = "openbsd")))]
+pub(crate) fn tcp_keepidle(fd: BorrowedFd<'_>) -> io::Result<Duration> {
+    let secs: c::c_uint = getsockopt(fd, c::IPPROTO_TCP, TCP_KEEPIDLE)?;
+    Ok(Duration::from_secs(secs as u64))
+}
+
+#[inline]
+#[cfg(not(any(
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "openbsd",
+    target_os = "redox"
+)))]
+pub(crate) fn set_tcp_keepintvl(fd: BorrowedFd<'_>, duration: Duration) -> io::Result<()> {
+    let secs: c::c_uint = duration_to_secs(duration)?;
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPINTVL, secs)
+}
+
+#[inline]
+#[cfg(not(any(
+    target_os = "haiku",
+    target_os = "nto",
+    target_os = "openbsd",
+    target_os = "redox"
+)))]
+pub(crate) fn tcp_keepintvl(fd: BorrowedFd<'_>) -> io::Result<Duration> {
+    let secs: c::c_uint = getsockopt(fd, c::IPPROTO_TCP, c::TCP_KEEPINTVL)?;
+    Ok(Duration::from_secs(secs as u64))
+}
+
+#[inline]
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+pub(crate) fn set_tcp_user_timeout(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_USER_TIMEOUT, value)
+}
+
+#[inline]
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+pub(crate) fn tcp_user_timeout(fd: BorrowedFd<'_>) -> io::Result<u32> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_USER_TIMEOUT)
+}
+
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn set_tcp_quickack(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_QUICKACK, from_bool(value))
+}
+
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn tcp_quickack(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_QUICKACK).map(to_bool)
+}
+
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+#[inline]
+pub(crate) fn set_tcp_congestion(fd: BorrowedFd<'_>, value: &str) -> io::Result<()> {
+    let level = c::IPPROTO_TCP;
+    let optname = c::TCP_CONGESTION;
+    let optlen = value.len().try_into().unwrap();
+    setsockopt_raw(fd, level, optname, value.as_ptr(), optlen)
+}
+
+#[cfg(feature = "alloc")]
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+#[inline]
+pub(crate) fn tcp_congestion(fd: BorrowedFd<'_>) -> io::Result<String> {
+    const OPTLEN: c::socklen_t = 16;
+
+    let level = c::IPPROTO_TCP;
+    let optname = c::TCP_CONGESTION;
+    let mut value = MaybeUninit::<[MaybeUninit<u8>; OPTLEN as usize]>::uninit();
+    let mut optlen = OPTLEN;
+    getsockopt_raw(fd, level, optname, &mut value, &mut optlen)?;
+    unsafe {
+        let value = value.assume_init();
+        let slice: &[u8] = core::mem::transmute(&value[..optlen as usize]);
+        assert!(slice.contains(&b'\0'));
+        Ok(
+            core::str::from_utf8(CStr::from_ptr(slice.as_ptr().cast()).to_bytes())
+                .unwrap()
+                .to_owned(),
+        )
+    }
+}
+
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn set_tcp_thin_linear_timeouts(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(
+        fd,
+        c::IPPROTO_TCP,
+        c::TCP_THIN_LINEAR_TIMEOUTS,
+        from_bool(value),
+    )
+}
+
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn tcp_thin_linear_timeouts(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_THIN_LINEAR_TIMEOUTS).map(to_bool)
+}
+
+#[cfg(any(linux_like, solarish, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn set_tcp_cork(fd: BorrowedFd<'_>, value: bool) -> io::Result<()> {
+    setsockopt(fd, c::IPPROTO_TCP, c::TCP_CORK, from_bool(value))
+}
+
+#[cfg(any(linux_like, solarish, target_os = "fuchsia"))]
+#[inline]
+pub(crate) fn tcp_cork(fd: BorrowedFd<'_>) -> io::Result<bool> {
+    getsockopt(fd, c::IPPROTO_TCP, c::TCP_CORK).map(to_bool)
+}
+
+#[cfg(linux_kernel)]
+#[inline]
+pub(crate) fn socket_peercred(fd: BorrowedFd<'_>) -> io::Result<UCred> {
+    getsockopt(fd, c::SOL_SOCKET, c::SO_PEERCRED)
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn set_xdp_umem_reg(fd: BorrowedFd<'_>, value: XdpUmemReg) -> io::Result<()> {
+    setsockopt(fd, c::SOL_XDP, c::XDP_UMEM_REG, value)
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn set_xdp_umem_fill_ring_size(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::SOL_XDP, c::XDP_UMEM_FILL_RING, value)
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn set_xdp_umem_completion_ring_size(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::SOL_XDP, c::XDP_UMEM_COMPLETION_RING, value)
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn set_xdp_tx_ring_size(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::SOL_XDP, c::XDP_TX_RING, value)
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn set_xdp_rx_ring_size(fd: BorrowedFd<'_>, value: u32) -> io::Result<()> {
+    setsockopt(fd, c::SOL_XDP, c::XDP_RX_RING, value)
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn xdp_mmap_offsets(fd: BorrowedFd<'_>) -> io::Result<XdpMmapOffsets> {
+    // The kernel will write `xdp_mmap_offsets` or `xdp_mmap_offsets_v1` to the
+    // supplied pointer, depending on the kernel version. Both structs only
+    // contain u64 values. By using the larger of both as the parameter, we can
+    // shuffle the values to the non-v1 version returned by
+    // `get_xdp_mmap_offsets` while keeping the return type unaffected by the
+    // kernel version. This works because C will layout all struct members one
+    // after the other.
+
+    let mut optlen = size_of::<xdp_mmap_offsets>().try_into().unwrap();
+    debug_assert!(
+        optlen as usize >= size_of::<c::c_int>(),
+        "Socket APIs don't ever use `bool` directly"
+    );
+    let mut value = MaybeUninit::<xdp_mmap_offsets>::zeroed();
+    getsockopt_raw(fd, c::SOL_XDP, c::XDP_MMAP_OFFSETS, &mut value, &mut optlen)?;
+
+    if optlen as usize == size_of::<c::xdp_mmap_offsets_v1>() {
+        // SAFETY: All members of xdp_mmap_offsets are `u64` and thus are
+        // correctly initialized by `MaybeUninit::<xdp_statistics>::zeroed()`.
+        let xpd_mmap_offsets = unsafe { value.assume_init() };
+        Ok(XdpMmapOffsets {
+            rx: XdpRingOffset {
+                producer: xpd_mmap_offsets.rx.producer,
+                consumer: xpd_mmap_offsets.rx.consumer,
+                desc: xpd_mmap_offsets.rx.desc,
+                flags: None,
+            },
+            tx: XdpRingOffset {
+                producer: xpd_mmap_offsets.rx.flags,
+                consumer: xpd_mmap_offsets.tx.producer,
+                desc: xpd_mmap_offsets.tx.consumer,
+                flags: None,
+            },
+            fr: XdpRingOffset {
+                producer: xpd_mmap_offsets.tx.desc,
+                consumer: xpd_mmap_offsets.tx.flags,
+                desc: xpd_mmap_offsets.fr.producer,
+                flags: None,
+            },
+            cr: XdpRingOffset {
+                producer: xpd_mmap_offsets.fr.consumer,
+                consumer: xpd_mmap_offsets.fr.desc,
+                desc: xpd_mmap_offsets.fr.flags,
+                flags: None,
+            },
+        })
+    } else {
+        assert_eq!(
+            optlen as usize,
+            size_of::<xdp_mmap_offsets>(),
+            "unexpected getsockopt size"
+        );
+        // SAFETY: All members of xdp_mmap_offsets are `u64` and thus are
+        // correctly initialized by `MaybeUninit::<xdp_statistics>::zeroed()`
+        let xpd_mmap_offsets = unsafe { value.assume_init() };
+        Ok(XdpMmapOffsets {
+            rx: XdpRingOffset {
+                producer: xpd_mmap_offsets.rx.producer,
+                consumer: xpd_mmap_offsets.rx.consumer,
+                desc: xpd_mmap_offsets.rx.desc,
+                flags: Some(xpd_mmap_offsets.rx.flags),
+            },
+            tx: XdpRingOffset {
+                producer: xpd_mmap_offsets.tx.producer,
+                consumer: xpd_mmap_offsets.tx.consumer,
+                desc: xpd_mmap_offsets.tx.desc,
+                flags: Some(xpd_mmap_offsets.tx.flags),
+            },
+            fr: XdpRingOffset {
+                producer: xpd_mmap_offsets.fr.producer,
+                consumer: xpd_mmap_offsets.fr.consumer,
+                desc: xpd_mmap_offsets.fr.desc,
+                flags: Some(xpd_mmap_offsets.fr.flags),
+            },
+            cr: XdpRingOffset {
+                producer: xpd_mmap_offsets.cr.producer,
+                consumer: xpd_mmap_offsets.cr.consumer,
+                desc: xpd_mmap_offsets.cr.desc,
+                flags: Some(xpd_mmap_offsets.cr.flags),
+            },
+        })
+    }
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn xdp_statistics(fd: BorrowedFd<'_>) -> io::Result<XdpStatistics> {
+    let mut optlen = size_of::<xdp_statistics>().try_into().unwrap();
+    debug_assert!(
+        optlen as usize >= size_of::<c::c_int>(),
+        "Socket APIs don't ever use `bool` directly"
+    );
+    let mut value = MaybeUninit::<xdp_statistics>::zeroed();
+    getsockopt_raw(fd, c::SOL_XDP, c::XDP_STATISTICS, &mut value, &mut optlen)?;
+
+    if optlen as usize == size_of::<xdp_statistics_v1>() {
+        // SAFETY: All members of xdp_statistics are `u64` and thus are
+        // correctly initialized by `MaybeUninit::<xdp_statistics>::zeroed()`.
+        let xdp_statistics = unsafe { value.assume_init() };
+        Ok(XdpStatistics {
+            rx_dropped: xdp_statistics.rx_dropped,
+            rx_invalid_descs: xdp_statistics.rx_dropped,
+            tx_invalid_descs: xdp_statistics.rx_dropped,
+            rx_ring_full: None,
+            rx_fill_ring_empty_descs: None,
+            tx_ring_empty_descs: None,
+        })
+    } else {
+        assert_eq!(
+            optlen as usize,
+            size_of::<xdp_statistics>(),
+            "unexpected getsockopt size"
+        );
+        // SAFETY: All members of xdp_statistics are `u64` and thus are
+        // correctly initialized by `MaybeUninit::<xdp_statistics>::zeroed()`.
+        let xdp_statistics = unsafe { value.assume_init() };
+        Ok(XdpStatistics {
+            rx_dropped: xdp_statistics.rx_dropped,
+            rx_invalid_descs: xdp_statistics.rx_invalid_descs,
+            tx_invalid_descs: xdp_statistics.tx_invalid_descs,
+            rx_ring_full: Some(xdp_statistics.rx_ring_full),
+            rx_fill_ring_empty_descs: Some(xdp_statistics.rx_fill_ring_empty_descs),
+            tx_ring_empty_descs: Some(xdp_statistics.tx_ring_empty_descs),
+        })
+    }
+}
+
+#[cfg(target_os = "linux")]
+#[inline]
+pub(crate) fn xdp_options(fd: BorrowedFd<'_>) -> io::Result<XdpOptionsFlags> {
+    getsockopt(fd, c::SOL_XDP, c::XDP_OPTIONS)
+}
+
+#[inline]
+fn to_ip_mreq(multiaddr: &Ipv4Addr, interface: &Ipv4Addr) -> c::ip_mreq {
+    c::ip_mreq {
+        imr_multiaddr: to_imr_addr(multiaddr),
+        imr_interface: to_imr_addr(interface),
+    }
+}
+
+#[cfg(not(windows))]
+#[inline]
+fn from_in_addr(in_addr: c::in_addr) -> Ipv4Addr {
+    Ipv4Addr::from(in_addr.s_addr.to_ne_bytes())
+}
+
+#[cfg(windows)]
+fn from_in_addr(in_addr: c::in_addr) -> Ipv4Addr {
+    Ipv4Addr::from(unsafe { in_addr.S_un.S_addr.to_ne_bytes() })
+}
+
+#[cfg(any(
+    apple,
+    freebsdlike,
+    linux_like,
+    target_os = "fuchsia",
+    target_os = "openbsd"
+))]
+#[inline]
+fn to_ip_mreqn(multiaddr: &Ipv4Addr, address: &Ipv4Addr, ifindex: i32) -> c::ip_mreqn {
+    c::ip_mreqn {
+        imr_multiaddr: to_imr_addr(multiaddr),
+        imr_address: to_imr_addr(address),
+        imr_ifindex: ifindex,
+    }
+}
+
+#[cfg(any(apple, freebsdlike, linux_like, solarish, target_os = "aix"))]
+#[inline]
+fn to_imr_source(
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> c::ip_mreq_source {
+    c::ip_mreq_source {
+        imr_multiaddr: to_imr_addr(multiaddr),
+        imr_interface: to_imr_addr(interface),
+        imr_sourceaddr: to_imr_addr(sourceaddr),
+    }
+}
+
+#[inline]
+fn to_imr_addr(addr: &Ipv4Addr) -> c::in_addr {
+    in_addr_new(u32::from_ne_bytes(addr.octets()))
+}
+
+#[inline]
+fn to_ipv6mr(multiaddr: &Ipv6Addr, interface: u32) -> c::ipv6_mreq {
+    c::ipv6_mreq {
+        ipv6mr_multiaddr: to_ipv6mr_multiaddr(multiaddr),
+        ipv6mr_interface: to_ipv6mr_interface(interface),
+    }
+}
+
+#[inline]
+fn to_ipv6mr_multiaddr(multiaddr: &Ipv6Addr) -> c::in6_addr {
+    in6_addr_new(multiaddr.octets())
+}
+
+#[cfg(target_os = "android")]
+#[inline]
+fn to_ipv6mr_interface(interface: u32) -> c::c_int {
+    interface as c::c_int
+}
+
+#[cfg(not(target_os = "android"))]
+#[inline]
+fn to_ipv6mr_interface(interface: u32) -> c::c_uint {
+    interface as c::c_uint
+}
+
+// `getsockopt` and `setsockopt` represent boolean values as integers.
+#[cfg(not(windows))]
+type RawSocketBool = c::c_int;
+#[cfg(windows)]
+type RawSocketBool = BOOL;
+
+// Wrap `RawSocketBool` in a newtype to discourage misuse.
+#[repr(transparent)]
+#[derive(Copy, Clone)]
+struct SocketBool(RawSocketBool);
+
+// Convert from a `bool` to a `SocketBool`.
+#[inline]
+fn from_bool(value: bool) -> SocketBool {
+    SocketBool(value.into())
+}
+
+// Convert from a `SocketBool` to a `bool`.
+#[inline]
+fn to_bool(value: SocketBool) -> bool {
+    value.0 != 0
+}
+
+/// Convert to seconds, rounding up if necessary.
+#[inline]
+fn duration_to_secs<T: TryFrom<u64>>(duration: Duration) -> io::Result<T> {
+    let mut secs = duration.as_secs();
+    if duration.subsec_nanos() != 0 {
+        secs = secs.checked_add(1).ok_or(io::Errno::INVAL)?;
+    }
+    T::try_from(secs).map_err(|_e| io::Errno::INVAL)
+}
diff --git a/vendor/rustix/src/backend/libc/net/syscalls.rs b/vendor/rustix/src/backend/libc/net/syscalls.rs
new file mode 100644
index 00000000..aafea002
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/syscalls.rs
@@ -0,0 +1,438 @@
+//! libc syscalls supporting `rustix::net`.
+
+use super::read_sockaddr::initialize_family_to_unspec;
+use super::send_recv::{RecvFlags, SendFlags};
+use crate::backend::c;
+#[cfg(target_os = "linux")]
+use crate::backend::conv::ret_u32;
+use crate::backend::conv::{borrowed_fd, ret, ret_owned_fd, ret_send_recv, send_recv_len};
+use crate::fd::{BorrowedFd, OwnedFd};
+use crate::io;
+use crate::net::addr::SocketAddrArg;
+#[cfg(target_os = "linux")]
+use crate::net::MMsgHdr;
+use crate::net::{
+    AddressFamily, Protocol, Shutdown, SocketAddrAny, SocketAddrBuf, SocketFlags, SocketType,
+};
+use crate::utils::as_ptr;
+use core::mem::{size_of, MaybeUninit};
+use core::ptr::null_mut;
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "horizon",
+    target_os = "redox",
+    target_os = "vita"
+)))]
+use {
+    super::msghdr::{noaddr_msghdr, with_msghdr, with_recv_msghdr},
+    super::send_recv::ReturnFlags,
+    crate::io::{IoSlice, IoSliceMut},
+    crate::net::{RecvAncillaryBuffer, RecvMsg, SendAncillaryBuffer},
+};
+
+pub(crate) unsafe fn recv(
+    fd: BorrowedFd<'_>,
+    buf: (*mut u8, usize),
+    flags: RecvFlags,
+) -> io::Result<usize> {
+    ret_send_recv(c::recv(
+        borrowed_fd(fd),
+        buf.0.cast(),
+        send_recv_len(buf.1),
+        bitflags_bits!(flags),
+    ))
+}
+
+pub(crate) fn send(fd: BorrowedFd<'_>, buf: &[u8], flags: SendFlags) -> io::Result<usize> {
+    unsafe {
+        ret_send_recv(c::send(
+            borrowed_fd(fd),
+            buf.as_ptr().cast(),
+            send_recv_len(buf.len()),
+            bitflags_bits!(flags),
+        ))
+    }
+}
+
+pub(crate) unsafe fn recvfrom(
+    fd: BorrowedFd<'_>,
+    buf: (*mut u8, usize),
+    flags: RecvFlags,
+) -> io::Result<(usize, Option<SocketAddrAny>)> {
+    let mut addr = SocketAddrBuf::new();
+
+    // `recvfrom` does not write to the storage if the socket is
+    // connection-oriented sockets, so we initialize the family field to
+    // `AF_UNSPEC` so that we can detect this case.
+    initialize_family_to_unspec(addr.storage.as_mut_ptr().cast::<c::sockaddr>());
+
+    let nread = ret_send_recv(c::recvfrom(
+        borrowed_fd(fd),
+        buf.0.cast(),
+        send_recv_len(buf.1),
+        bitflags_bits!(flags),
+        addr.storage.as_mut_ptr().cast::<c::sockaddr>(),
+        &mut addr.len,
+    ))?;
+
+    Ok((nread, addr.into_any_option()))
+}
+
+pub(crate) fn sendto(
+    fd: BorrowedFd<'_>,
+    buf: &[u8],
+    flags: SendFlags,
+    addr: &impl SocketAddrArg,
+) -> io::Result<usize> {
+    unsafe {
+        addr.with_sockaddr(|addr_ptr, addr_len| {
+            ret_send_recv(c::sendto(
+                borrowed_fd(fd),
+                buf.as_ptr().cast(),
+                send_recv_len(buf.len()),
+                bitflags_bits!(flags),
+                addr_ptr.cast(),
+                bitcast!(addr_len),
+            ))
+        })
+    }
+}
+
+pub(crate) fn socket(
+    domain: AddressFamily,
+    type_: SocketType,
+    protocol: Option<Protocol>,
+) -> io::Result<OwnedFd> {
+    let raw_protocol = match protocol {
+        Some(p) => p.0.get(),
+        None => 0,
+    };
+    unsafe {
+        ret_owned_fd(c::socket(
+            domain.0 as c::c_int,
+            type_.0 as c::c_int,
+            raw_protocol as c::c_int,
+        ))
+    }
+}
+
+pub(crate) fn socket_with(
+    domain: AddressFamily,
+    type_: SocketType,
+    flags: SocketFlags,
+    protocol: Option<Protocol>,
+) -> io::Result<OwnedFd> {
+    let raw_protocol = match protocol {
+        Some(p) => p.0.get(),
+        None => 0,
+    };
+    unsafe {
+        ret_owned_fd(c::socket(
+            domain.0 as c::c_int,
+            (type_.0 | flags.bits()) as c::c_int,
+            raw_protocol as c::c_int,
+        ))
+    }
+}
+
+pub(crate) fn bind(sockfd: BorrowedFd<'_>, addr: &impl SocketAddrArg) -> io::Result<()> {
+    unsafe {
+        addr.with_sockaddr(|addr_ptr, addr_len| {
+            ret(c::bind(
+                borrowed_fd(sockfd),
+                addr_ptr.cast(),
+                bitcast!(addr_len),
+            ))
+        })
+    }
+}
+
+pub(crate) fn connect(sockfd: BorrowedFd<'_>, addr: &impl SocketAddrArg) -> io::Result<()> {
+    unsafe {
+        addr.with_sockaddr(|addr_ptr, addr_len| {
+            ret(c::connect(
+                borrowed_fd(sockfd),
+                addr_ptr.cast(),
+                bitcast!(addr_len),
+            ))
+        })
+    }
+}
+
+pub(crate) fn connect_unspec(sockfd: BorrowedFd<'_>) -> io::Result<()> {
+    debug_assert_eq!(c::AF_UNSPEC, 0);
+    let addr = MaybeUninit::<c::sockaddr_storage>::zeroed();
+    unsafe {
+        ret(c::connect(
+            borrowed_fd(sockfd),
+            as_ptr(&addr).cast(),
+            size_of::<c::sockaddr_storage>() as c::socklen_t,
+        ))
+    }
+}
+
+pub(crate) fn listen(sockfd: BorrowedFd<'_>, backlog: c::c_int) -> io::Result<()> {
+    unsafe { ret(c::listen(borrowed_fd(sockfd), backlog)) }
+}
+
+pub(crate) fn accept(sockfd: BorrowedFd<'_>) -> io::Result<OwnedFd> {
+    unsafe {
+        let owned_fd = ret_owned_fd(c::accept(borrowed_fd(sockfd), null_mut(), null_mut()))?;
+        Ok(owned_fd)
+    }
+}
+
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "horizon",
+    target_os = "redox",
+    target_os = "vita"
+)))]
+pub(crate) fn recvmsg(
+    sockfd: BorrowedFd<'_>,
+    iov: &mut [IoSliceMut<'_>],
+    control: &mut RecvAncillaryBuffer<'_>,
+    msg_flags: RecvFlags,
+) -> io::Result<RecvMsg> {
+    let mut addr = SocketAddrBuf::new();
+
+    // SAFETY: This passes the `msghdr` reference to the OS which reads the
+    // buffers only within the designated bounds.
+    let (bytes, flags) = unsafe {
+        with_recv_msghdr(&mut addr, iov, control, |msghdr| {
+            let bytes = ret_send_recv(c::recvmsg(
+                borrowed_fd(sockfd),
+                msghdr,
+                bitflags_bits!(msg_flags),
+            ))?;
+            Ok((bytes, msghdr.msg_flags))
+        })?
+    };
+
+    Ok(RecvMsg {
+        bytes,
+        address: unsafe { addr.into_any_option() },
+        flags: ReturnFlags::from_bits_retain(bitcast!(flags)),
+    })
+}
+
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "horizon",
+    target_os = "redox",
+    target_os = "vita"
+)))]
+pub(crate) fn sendmsg(
+    sockfd: BorrowedFd<'_>,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    msg_flags: SendFlags,
+) -> io::Result<usize> {
+    let msghdr = noaddr_msghdr(iov, control);
+    unsafe {
+        ret_send_recv(c::sendmsg(
+            borrowed_fd(sockfd),
+            &msghdr,
+            bitflags_bits!(msg_flags),
+        ))
+    }
+}
+
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "horizon",
+    target_os = "redox",
+    target_os = "vita"
+)))]
+pub(crate) fn sendmsg_addr(
+    sockfd: BorrowedFd<'_>,
+    addr: &impl SocketAddrArg,
+    iov: &[IoSlice<'_>],
+    control: &mut SendAncillaryBuffer<'_, '_, '_>,
+    msg_flags: SendFlags,
+) -> io::Result<usize> {
+    // SAFETY: This passes the `msghdr` reference to the OS which reads the
+    // buffers only within the designated bounds.
+    unsafe {
+        with_msghdr(addr, iov, control, |msghdr| {
+            ret_send_recv(c::sendmsg(
+                borrowed_fd(sockfd),
+                msghdr,
+                bitflags_bits!(msg_flags),
+            ))
+        })
+    }
+}
+
+#[cfg(target_os = "linux")]
+pub(crate) fn sendmmsg(
+    sockfd: BorrowedFd<'_>,
+    msgs: &mut [MMsgHdr<'_>],
+    flags: SendFlags,
+) -> io::Result<usize> {
+    unsafe {
+        ret_u32(c::sendmmsg(
+            borrowed_fd(sockfd),
+            msgs.as_mut_ptr() as _,
+            msgs.len().try_into().unwrap_or(c::c_uint::MAX),
+            bitflags_bits!(flags),
+        ))
+        .map(|ret| ret as usize)
+    }
+}
+
+#[cfg(not(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "horizon",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+)))]
+pub(crate) fn accept_with(sockfd: BorrowedFd<'_>, flags: SocketFlags) -> io::Result<OwnedFd> {
+    unsafe {
+        let owned_fd = ret_owned_fd(c::accept4(
+            borrowed_fd(sockfd),
+            null_mut(),
+            null_mut(),
+            flags.bits() as c::c_int,
+        ))?;
+        Ok(owned_fd)
+    }
+}
+
+pub(crate) fn acceptfrom(sockfd: BorrowedFd<'_>) -> io::Result<(OwnedFd, Option<SocketAddrAny>)> {
+    unsafe {
+        let mut addr = SocketAddrBuf::new();
+        let owned_fd = ret_owned_fd(c::accept(
+            borrowed_fd(sockfd),
+            addr.storage.as_mut_ptr().cast::<c::sockaddr>(),
+            &mut addr.len,
+        ))?;
+        Ok((owned_fd, addr.into_any_option()))
+    }
+}
+
+#[cfg(not(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "horizon",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+)))]
+pub(crate) fn acceptfrom_with(
+    sockfd: BorrowedFd<'_>,
+    flags: SocketFlags,
+) -> io::Result<(OwnedFd, Option<SocketAddrAny>)> {
+    unsafe {
+        let mut addr = SocketAddrBuf::new();
+        let owned_fd = ret_owned_fd(c::accept4(
+            borrowed_fd(sockfd),
+            addr.storage.as_mut_ptr().cast::<c::sockaddr>(),
+            &mut addr.len,
+            flags.bits() as c::c_int,
+        ))?;
+        Ok((owned_fd, addr.into_any_option()))
+    }
+}
+
+/// Darwin lacks `accept4`, but does have `accept`. We define `SocketFlags` to
+/// have no flags, so we can discard it here.
+#[cfg(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "horizon",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+))]
+pub(crate) fn accept_with(sockfd: BorrowedFd<'_>, _flags: SocketFlags) -> io::Result<OwnedFd> {
+    accept(sockfd)
+}
+
+/// Darwin lacks `accept4`, but does have `accept`. We define `SocketFlags` to
+/// have no flags, so we can discard it here.
+#[cfg(any(
+    apple,
+    windows,
+    target_os = "aix",
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "horizon",
+    target_os = "nto",
+    target_os = "redox",
+    target_os = "vita",
+))]
+pub(crate) fn acceptfrom_with(
+    sockfd: BorrowedFd<'_>,
+    _flags: SocketFlags,
+) -> io::Result<(OwnedFd, Option<SocketAddrAny>)> {
+    acceptfrom(sockfd)
+}
+
+pub(crate) fn shutdown(sockfd: BorrowedFd<'_>, how: Shutdown) -> io::Result<()> {
+    unsafe { ret(c::shutdown(borrowed_fd(sockfd), how as c::c_int)) }
+}
+
+pub(crate) fn getsockname(sockfd: BorrowedFd<'_>) -> io::Result<SocketAddrAny> {
+    unsafe {
+        let mut addr = SocketAddrBuf::new();
+        ret(c::getsockname(
+            borrowed_fd(sockfd),
+            addr.storage.as_mut_ptr().cast::<c::sockaddr>(),
+            &mut addr.len,
+        ))?;
+        Ok(addr.into_any())
+    }
+}
+
+pub(crate) fn getpeername(sockfd: BorrowedFd<'_>) -> io::Result<Option<SocketAddrAny>> {
+    unsafe {
+        let mut addr = SocketAddrBuf::new();
+        ret(c::getpeername(
+            borrowed_fd(sockfd),
+            addr.storage.as_mut_ptr().cast::<c::sockaddr>(),
+            &mut addr.len,
+        ))?;
+        Ok(addr.into_any_option())
+    }
+}
+
+#[cfg(not(windows))]
+pub(crate) fn socketpair(
+    domain: AddressFamily,
+    type_: SocketType,
+    flags: SocketFlags,
+    protocol: Option<Protocol>,
+) -> io::Result<(OwnedFd, OwnedFd)> {
+    let raw_protocol = match protocol {
+        Some(p) => p.0.get(),
+        None => 0,
+    };
+    unsafe {
+        let mut fds = MaybeUninit::<[OwnedFd; 2]>::uninit();
+        ret(c::socketpair(
+            c::c_int::from(domain.0),
+            (type_.0 | flags.bits()) as c::c_int,
+            raw_protocol as c::c_int,
+            fds.as_mut_ptr().cast::<c::c_int>(),
+        ))?;
+
+        let [fd0, fd1] = fds.assume_init();
+        Ok((fd0, fd1))
+    }
+}
diff --git a/vendor/rustix/src/backend/libc/net/write_sockaddr.rs b/vendor/rustix/src/backend/libc/net/write_sockaddr.rs
new file mode 100644
index 00000000..08f04646
--- /dev/null
+++ b/vendor/rustix/src/backend/libc/net/write_sockaddr.rs
@@ -0,0 +1,72 @@
+//! The BSD sockets API requires us to read the `sa_family` field before we can
+//! interpret the rest of a `sockaddr` produced by the kernel.
+
+use super::ext::{in6_addr_new, in_addr_new, sockaddr_in6_new};
+use crate::backend::c;
+use crate::net::{SocketAddrV4, SocketAddrV6};
+
+pub(crate) fn encode_sockaddr_v4(v4: &SocketAddrV4) -> c::sockaddr_in {
+    c::sockaddr_in {
+        #[cfg(any(
+            bsd,
+            target_os = "aix",
+            target_os = "espidf",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "nto",
+            target_os = "vita",
+        ))]
+        sin_len: core::mem::size_of::<c::sockaddr_in>() as _,
+        sin_family: c::AF_INET as _,
+        sin_port: u16::to_be(v4.port()),
+        sin_addr: in_addr_new(u32::from_ne_bytes(v4.ip().octets())),
+        #[cfg(not(any(target_os = "haiku", target_os = "vita")))]
+        sin_zero: [0; 8_usize],
+        #[cfg(target_os = "haiku")]
+        sin_zero: [0; 24_usize],
+        #[cfg(target_os = "vita")]
+        sin_zero: [0; 6_usize],
+        #[cfg(target_os = "vita")]
+        sin_vport: 0,
+    }
+}
+
+pub(crate) fn encode_sockaddr_v6(v6: &SocketAddrV6) -> c::sockaddr_in6 {
+    #[cfg(any(
+        bsd,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "nto",
+        target_os = "vita"
+    ))]
+    {
+        sockaddr_in6_new(
+            core::mem::size_of::<c::sockaddr_in6>() as _,
+            c::AF_INET6 as _,
+            u16::to_be(v6.port()),
+            u32::to_be(v6.flowinfo()),
+            in6_addr_new(v6.ip().octets()),
+            v6.scope_id(),
+        )
+    }
+    #[cfg(not(any(
+        bsd,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "hurd",
+        target_os = "nto",
+        target_os = "vita"
+    )))]
+    {
+        sockaddr_in6_new(
+            c::AF_INET6 as _,
+            u16::to_be(v6.port()),
+            u32::to_be(v6.flowinfo()),
+            in6_addr_new(v6.ip().octets()),
+            v6.scope_id(),
+        )
+    }
+}