Merging upstream version 1.75.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 1295 insertions, 1707 deletions

diff --git a/vendor/rustix/src/net/send_recv/mod.rs b/vendor/rustix/src/net/send_recv/mod.rs
index 1dedd99cb..a377f65ad 100644
--- a/vendor/rustix/src/net/send_recv/mod.rs
+++ b/vendor/rustix/src/net/send_recv/mod.rs
@@ -8,10 +8,22 @@ use backend::fd::{AsFd, BorrowedFd};
 
 pub use backend::net::send_recv::{RecvFlags, SendFlags};
 
-#[cfg(not(any(windows, target_os = "espidf", target_os = "redox", target_os = "wasi")))]
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
 mod msg;
 
-#[cfg(not(any(windows, target_os = "espidf", target_os = "redox", target_os = "wasi")))]
+#[cfg(not(any(
+    windows,
+    target_os = "espidf",
+    target_os = "redox",
+    target_os = "vita",
+    target_os = "wasi"
+)))]
 pub use msg::*;
 
 /// `recv(fd, buf, flags)`—Reads data from a socket.
diff --git a/vendor/rustix/src/net/send_recv/msg.rs b/vendor/rustix/src/net/send_recv/msg.rs
index 431aefa03..ea91cbfec 100644
--- a/vendor/rustix/src/net/send_recv/msg.rs
+++ b/vendor/rustix/src/net/send_recv/msg.rs
@@ -5,10 +5,14 @@
 use crate::backend::{self, c};
 use crate::fd::{AsFd, BorrowedFd, OwnedFd};
 use crate::io::{self, IoSlice, IoSliceMut};
+#[cfg(linux_kernel)]
+use crate::net::UCred;
 
 use core::iter::FusedIterator;
 use core::marker::PhantomData;
-use core::mem::{size_of, size_of_val, take};
+use core::mem::{align_of, size_of, size_of_val, take};
+#[cfg(linux_kernel)]
+use core::ptr::addr_of;
 use core::{ptr, slice};
 
 use super::{RecvFlags, SendFlags, SocketAddrAny, SocketAddrV4, SocketAddrV6};
@@ -22,6 +26,11 @@ macro_rules! cmsg_space {
             $len * ::core::mem::size_of::<$crate::fd::BorrowedFd<'static>>(),
         )
     };
+    (ScmCredentials($len:expr)) => {
+        $crate::net::__cmsg_space(
+            $len * ::core::mem::size_of::<$crate::net::UCred>(),
+        )
+    };
 
     // Combo Rules
     (($($($x:tt)*),+)) => {
@@ -33,8 +42,19 @@ macro_rules! cmsg_space {
 }
 
 #[doc(hidden)]
-pub fn __cmsg_space(len: usize) -> usize {
-    unsafe { c::CMSG_SPACE(len.try_into().expect("CMSG_SPACE size overflow")) as usize }
+pub const fn __cmsg_space(len: usize) -> usize {
+    // Add `align_of::<c::cmsghdr>()` so that we can align the user-provided
+    // `&[u8]` to the required alignment boundary.
+    let len = len + align_of::<c::cmsghdr>();
+
+    // Convert `len` to `u32` for `CMSG_SPACE`. This would be `try_into()` if
+    // we could call that in a `const fn`.
+    let converted_len = len as u32;
+    if converted_len as usize != len {
+        unreachable!(); // `CMSG_SPACE` size overflow
+    }
+
+    unsafe { c::CMSG_SPACE(converted_len) as usize }
 }
 
 /// Ancillary message for [`sendmsg`], [`sendmsg_v4`], [`sendmsg_v6`],
@@ -42,24 +62,23 @@ pub fn __cmsg_space(len: usize) -> usize {
 #[non_exhaustive]
 pub enum SendAncillaryMessage<'slice, 'fd> {
     /// Send file descriptors.
+    #[doc(alias = "SCM_RIGHTS")]
     ScmRights(&'slice [BorrowedFd<'fd>]),
+    /// Send process credentials.
+    #[cfg(linux_kernel)]
+    #[doc(alias = "SCM_CREDENTIAL")]
+    ScmCredentials(UCred),
 }
 
 impl SendAncillaryMessage<'_, '_> {
     /// Get the maximum size of an ancillary message.
     ///
     /// This can be helpful in determining the size of the buffer you allocate.
-    pub fn size(&self) -> usize {
-        let total_bytes = match self {
-            Self::ScmRights(slice) => size_of_val(*slice),
-        };
-
-        unsafe {
-            c::CMSG_SPACE(
-                total_bytes
-                    .try_into()
-                    .expect("size too large for CMSG_SPACE"),
-            ) as usize
+    pub const fn size(&self) -> usize {
+        match self {
+            Self::ScmRights(slice) => cmsg_space!(ScmRights(slice.len())),
+            #[cfg(linux_kernel)]
+            Self::ScmCredentials(_) => cmsg_space!(ScmCredentials(1)),
         }
     }
 }
@@ -68,10 +87,16 @@ impl SendAncillaryMessage<'_, '_> {
 #[non_exhaustive]
 pub enum RecvAncillaryMessage<'a> {
     /// Received file descriptors.
+    #[doc(alias = "SCM_RIGHTS")]
     ScmRights(AncillaryIter<'a, OwnedFd>),
+    /// Received process credentials.
+    #[cfg(linux_kernel)]
+    #[doc(alias = "SCM_CREDENTIALS")]
+    ScmCredentials(UCred),
 }
 
-/// Buffer for sending ancillary messages.
+/// Buffer for sending ancillary messages with [`sendmsg`], [`sendmsg_v4`],
+/// [`sendmsg_v6`], [`sendmsg_unix`], and [`sendmsg_any`].
 pub struct SendAncillaryBuffer<'buf, 'slice, 'fd> {
     /// Raw byte buffer for messages.
     buffer: &'buf mut [u8],
@@ -91,15 +116,20 @@ impl<'buf> From<&'buf mut [u8]> for SendAncillaryBuffer<'buf, '_, '_> {
 
 impl Default for SendAncillaryBuffer<'_, '_, '_> {
     fn default() -> Self {
-        Self::new(&mut [])
+        Self {
+            buffer: &mut [],
+            length: 0,
+            _phantom: PhantomData,
+        }
     }
 }
 
 impl<'buf, 'slice, 'fd> SendAncillaryBuffer<'buf, 'slice, 'fd> {
     /// Create a new, empty `SendAncillaryBuffer` from a raw byte buffer.
+    #[inline]
     pub fn new(buffer: &'buf mut [u8]) -> Self {
         Self {
-            buffer,
+            buffer: align_for_cmsghdr(buffer),
             length: 0,
             _phantom: PhantomData,
         }
@@ -138,6 +168,13 @@ impl<'buf, 'slice, 'fd> SendAncillaryBuffer<'buf, 'slice, 'fd> {
                     unsafe { slice::from_raw_parts(fds.as_ptr().cast::<u8>(), size_of_val(fds)) };
                 self.push_ancillary(fds_bytes, c::SOL_SOCKET as _, c::SCM_RIGHTS as _)
             }
+            #[cfg(linux_kernel)]
+            SendAncillaryMessage::ScmCredentials(ucred) => {
+                let ucred_bytes = unsafe {
+                    slice::from_raw_parts(addr_of!(ucred).cast::<u8>(), size_of_val(&ucred))
+                };
+                self.push_ancillary(ucred_bytes, c::SOL_SOCKET as _, c::SCM_CREDENTIALS as _)
+            }
         }
     }
 
@@ -191,7 +228,8 @@ impl<'slice, 'fd> Extend<SendAncillaryMessage<'slice, 'fd>>
     }
 }
 
-/// Buffer for receiving ancillary messages.
+/// Buffer for receiving ancillary messages with [`recvmsg`].
+#[derive(Default)]
 pub struct RecvAncillaryBuffer<'buf> {
     /// Raw byte buffer for messages.
     buffer: &'buf mut [u8],
@@ -209,17 +247,12 @@ impl<'buf> From<&'buf mut [u8]> for RecvAncillaryBuffer<'buf> {
     }
 }
 
-impl Default for RecvAncillaryBuffer<'_> {
-    fn default() -> Self {
-        Self::new(&mut [])
-    }
-}
-
 impl<'buf> RecvAncillaryBuffer<'buf> {
     /// Create a new, empty `RecvAncillaryBuffer` from a raw byte buffer.
+    #[inline]
     pub fn new(buffer: &'buf mut [u8]) -> Self {
         Self {
-            buffer,
+            buffer: align_for_cmsghdr(buffer),
             read: 0,
             length: 0,
         }
@@ -274,7 +307,17 @@ impl Drop for RecvAncillaryBuffer<'_> {
     }
 }
 
-/// An iterator that drains messages from a `RecvAncillaryBuffer`.
+/// Return a slice of `buffer` starting at the first `cmsghdr` alignment
+/// boundary.
+#[inline]
+fn align_for_cmsghdr(buffer: &mut [u8]) -> &mut [u8] {
+    let align = align_of::<c::cmsghdr>();
+    let addr = buffer.as_ptr() as usize;
+    let adjusted = (addr + (align - 1)) & align.wrapping_neg();
+    &mut buffer[adjusted - addr..]
+}
+
+/// An iterator that drains messages from a [`RecvAncillaryBuffer`].
 pub struct AncillaryDrain<'buf> {
     /// Inner iterator over messages.
     messages: messages::Messages<'buf>,
@@ -287,14 +330,14 @@ pub struct AncillaryDrain<'buf> {
 }
 
 impl<'buf> AncillaryDrain<'buf> {
-    /// A closure that converts a message into a `RecvAncillaryMessage`.
+    /// A closure that converts a message into a [`RecvAncillaryMessage`].
     fn cvt_msg(
         read: &mut usize,
         length: &mut usize,
         msg: &c::cmsghdr,
     ) -> Option<RecvAncillaryMessage<'buf>> {
         unsafe {
-            // Advance the "read" pointer.
+            // Advance the `read` pointer.
             let msg_len = msg.cmsg_len as usize;
             *read += msg_len;
             *length -= msg_len;
@@ -315,6 +358,15 @@ impl<'buf> AncillaryDrain<'buf> {
 
                     Some(RecvAncillaryMessage::ScmRights(fds))
                 }
+                #[cfg(linux_kernel)]
+                (c::SOL_SOCKET, c::SCM_CREDENTIALS) => {
+                    if payload_len >= size_of::<UCred>() {
+                        let ucred = payload.as_ptr().cast::<UCred>().read_unaligned();
+                        Some(RecvAncillaryMessage::ScmCredentials(ucred))
+                    } else {
+                        None
+                    }
+                }
                 _ => None,
             }
         }
@@ -693,7 +745,7 @@ mod messages {
 
     /// An iterator over the messages in an ancillary buffer.
     pub(super) struct Messages<'buf> {
-        /// The message header we're using to iterator over the messages.
+        /// The message header we're using to iterate over the messages.
         msghdr: c::msghdr,
 
         /// The current pointer to the next message header to return.
diff --git a/vendor/rustix/src/net/socket.rs b/vendor/rustix/src/net/socket.rs
index 8727ca53b..fe7439562 100644
--- a/vendor/rustix/src/net/socket.rs
+++ b/vendor/rustix/src/net/socket.rs
@@ -453,6 +453,44 @@ pub fn connect_unix<Fd: AsFd>(sockfd: Fd, addr: &SocketAddrUnix) -> io::Result<(
     backend::net::syscalls::connect_unix(sockfd.as_fd(), addr)
 }
 
+/// `connect(sockfd, {.sa_family = AF_UNSPEC}, sizeof(struct sockaddr))`
+/// — Dissolve the socket's association.
+///
+/// On UDP sockets, BSD platforms report [`Errno::AFNOSUPPORT`] or
+/// [`Errno::INVAL`] even if the disconnect was successful.
+///
+/// # References
+///  - [Beej's Guide to Network Programming]
+///  - [POSIX]
+///  - [Linux]
+///  - [Apple]
+///  - [Winsock2]
+///  - [FreeBSD]
+///  - [NetBSD]
+///  - [OpenBSD]
+///  - [DragonFly BSD]
+///  - [illumos]
+///  - [glibc]
+///
+/// [Beej's Guide to Network Programming]: https://beej.us/guide/bgnet/html/split/system-calls-or-bust.html#connect
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/connect.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/connect.2.html
+/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/connect.2.html
+/// [Winsock2]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-connect
+/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=connect&sektion=2
+/// [NetBSD]: https://man.netbsd.org/connect.2
+/// [OpenBSD]: https://man.openbsd.org/connect.2
+/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=connect&section=2
+/// [illumos]: https://illumos.org/man/3SOCKET/connect
+/// [glibc]: https://www.gnu.org/software/libc/manual/html_node/Connecting.html
+/// [`Errno::AFNOSUPPORT`]: io::Errno::AFNOSUPPORT
+/// [`Errno::INVAL`]: io::Errno::INVAL
+#[inline]
+#[doc(alias = "connect")]
+pub fn connect_unspec<Fd: AsFd>(sockfd: Fd) -> io::Result<()> {
+    backend::net::syscalls::connect_unspec(sockfd.as_fd())
+}
+
 /// `listen(fd, backlog)`—Enables listening for incoming connections.
 ///
 /// # References
diff --git a/vendor/rustix/src/net/socket_addr_any.rs b/vendor/rustix/src/net/socket_addr_any.rs
index 7cb124e4c..a649015f4 100644
--- a/vendor/rustix/src/net/socket_addr_any.rs
+++ b/vendor/rustix/src/net/socket_addr_any.rs
@@ -11,7 +11,7 @@
 
 #[cfg(unix)]
 use crate::net::SocketAddrUnix;
-use crate::net::{AddressFamily, SocketAddrV4, SocketAddrV6};
+use crate::net::{AddressFamily, SocketAddr, SocketAddrV4, SocketAddrV6};
 use crate::{backend, io};
 #[cfg(feature = "std")]
 use core::fmt;
@@ -32,6 +32,16 @@ pub enum SocketAddrAny {
     Unix(SocketAddrUnix),
 }
 
+impl From<SocketAddr> for SocketAddrAny {
+    #[inline]
+    fn from(from: SocketAddr) -> Self {
+        match from {
+            SocketAddr::V4(v4) => Self::V4(v4),
+            SocketAddr::V6(v6) => Self::V6(v6),
+        }
+    }
+}
+
 impl From<SocketAddrV4> for SocketAddrAny {
     #[inline]
     fn from(from: SocketAddrV4) -> Self {
diff --git a/vendor/rustix/src/net/sockopt.rs b/vendor/rustix/src/net/sockopt.rs
index 1939155d9..afeaf0b33 100644
--- a/vendor/rustix/src/net/sockopt.rs
+++ b/vendor/rustix/src/net/sockopt.rs
@@ -1,7 +1,144 @@
 //! `getsockopt` and `setsockopt` functions.
 //!
-//! In the rustix API, there is a separate function for each option, so that
-//! it can be given an option-specific type signature.
+//! In the rustix API, there is a separate function for each option, so that it
+//! can be given an option-specific type signature.
+//!
+//! # References for all `get_*` functions:
+//!
+//!  - [POSIX `getsockopt`]
+//!  - [Linux `getsockopt`]
+//!  - [Winsock2 `getsockopt`]
+//!  - [Apple `getsockopt`]
+//!  - [FreeBSD `getsockopt`]
+//!  - [NetBSD `getsockopt`]
+//!  - [OpenBSD `getsockopt`]
+//!  - [DragonFly BSD `getsockopt`]
+//!  - [illumos `getsockopt`]
+//!  - [glibc `getsockopt`]
+//!
+//! [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
+//! [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
+//! [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
+//! [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
+//! [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
+//! [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
+//! [OpenBSD `getsockopt`]: https://man.openbsd.org/getsockopt.2
+//! [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
+//! [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
+//! [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
+//!
+//! # References for all `set_*` functions:
+//!
+//!  - [POSIX `setsockopt`]
+//!  - [Linux `setsockopt`]
+//!  - [Winsock2 `setsockopt`]
+//!  - [Apple `setsockopt`]
+//!  - [FreeBSD `setsockopt`]
+//!  - [NetBSD `setsockopt`]
+//!  - [OpenBSD `setsockopt`]
+//!  - [DragonFly BSD `setsockopt`]
+//!  - [illumos `setsockopt`]
+//!  - [glibc `setsockopt`]
+//!
+//! [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
+//! [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
+//! [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
+//! [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
+//! [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
+//! [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
+//! [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
+//! [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
+//! [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
+//! [glibc `setsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
+//!
+//! # References for `get_socket_*` and `set_socket_*` functions:
+//!
+//!  - [References for all `get_*` functions]
+//!  - [References for all `set_*` functions]
+//!  - [POSIX `sys/socket.h`]
+//!  - [Linux `socket`]
+//!  - [Winsock2 `SOL_SOCKET` options]
+//!  - [glibc `SOL_SOCKET` Options]
+//!
+//! [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
+//! [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
+//! [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
+//! [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+//!
+//! # References for `get_ip_*` and `set_ip_*` functions:
+//!
+//!  - [References for all `get_*` functions]
+//!  - [References for all `set_*` functions]
+//!  - [POSIX `netinet/in.h`]
+//!  - [Linux `ip`]
+//!  - [Winsock2 `IPPROTO_IP` options]
+//!  - [Apple `ip`]
+//!  - [FreeBSD `ip`]
+//!  - [NetBSD `ip`]
+//!  - [OpenBSD `ip`]
+//!  - [DragonFly BSD `ip`]
+//!  - [illumos `ip`]
+//!
+//! [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
+//! [Linux `ip`]: https://man7.org/linux/man-pages/man7/ip.7.html
+//! [Winsock2 `IPPROTO_IP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
+//! [Apple `ip`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip.4.auto.html
+//! [FreeBSD `ip`]: https://man.freebsd.org/cgi/man.cgi?query=ip&sektion=4
+//! [NetBSD `ip`]: https://man.netbsd.org/ip.4
+//! [OpenBSD `ip`]: https://man.openbsd.org/ip.4
+//! [DragonFly BSD `ip`]: https://man.dragonflybsd.org/?command=ip&section=4
+//! [illumos `ip`]: https://illumos.org/man/4P/ip
+//!
+//! # References for `get_ipv6_*` and `set_ipv6_*` functions:
+//!
+//!  - [References for all `get_*` functions]
+//!  - [References for all `set_*` functions]
+//!  - [POSIX `netinet/in.h`]
+//!  - [Linux `ipv6`]
+//!  - [Winsock2 `IPPROTO_IPV6` options]
+//!  - [Apple `ip6`]
+//!  - [FreeBSD `ip6`]
+//!  - [NetBSD `ip6`]
+//!  - [OpenBSD `ip6`]
+//!  - [DragonFly BSD `ip6`]
+//!  - [illumos `ip6`]
+//!
+//! [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
+//! [Linux `ipv6`]: https://man7.org/linux/man-pages/man7/ipv6.7.html
+//! [Winsock2 `IPPROTO_IPV6` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
+//! [Apple `ip6`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip6.4.auto.html
+//! [FreeBSD `ip6`]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4
+//! [NetBSD `ip6`]: https://man.netbsd.org/ip6.4
+//! [OpenBSD `ip6`]: https://man.openbsd.org/ip6.4
+//! [DragonFly BSD `ip6`]: https://man.dragonflybsd.org/?command=ip6&section=4
+//! [illumos `ip6`]: https://illumos.org/man/4P/ip6
+//!
+//! # References for `get_tcp_*` and `set_tcp_*` functions:
+//!
+//!  - [References for all `get_*` functions]
+//!  - [References for all `set_*` functions]
+//!  - [POSIX `netinet/tcp.h`]
+//!  - [Linux `tcp`]
+//!  - [Winsock2 `IPPROTO_TCP` options]
+//!  - [Apple `tcp`]
+//!  - [FreeBSD `tcp`]
+//!  - [NetBSD `tcp`]
+//!  - [OpenBSD `tcp`]
+//!  - [DragonFly BSD `tcp`]
+//!  - [illumos `tcp`]
+//!
+//! [POSIX `netinet/tcp.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
+//! [Linux `tcp`]: https://man7.org/linux/man-pages/man7/tcp.7.html
+//! [Winsock2 `IPPROTO_TCP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options
+//! [Apple `tcp`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/tcp.4.auto.html
+//! [FreeBSD `tcp`]: https://man.freebsd.org/cgi/man.cgi?query=tcp&sektion=4
+//! [NetBSD `tcp`]: https://man.netbsd.org/tcp.4
+//! [OpenBSD `tcp`]: https://man.openbsd.org/tcp.4
+//! [DragonFly BSD `tcp`]: https://man.dragonflybsd.org/?command=tcp&section=4
+//! [illumos `tcp`]: https://illumos.org/man/4P/tcp
+//!
+//! [References for all `get_*` functions]: #references-for-all-get_-functions
+//! [References for all `set_*` functions]: #references-for-all-set_-functions
 
 #![doc(alias = "getsockopt")]
 #![doc(alias = "setsockopt")]
@@ -16,19 +153,38 @@
     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 = "fuchsia"))]
+use crate::net::SocketAddrV4;
+#[cfg(linux_kernel)]
+use crate::net::SocketAddrV6;
 use crate::net::{Ipv4Addr, Ipv6Addr, SocketType};
 use crate::{backend, io};
+#[cfg(feature = "alloc")]
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+use alloc::string::String;
 use backend::c;
 use backend::fd::AsFd;
 use core::time::Duration;
 
 /// Timeout identifier for use with [`set_socket_timeout`] and
 /// [`get_socket_timeout`].
-///
-/// [`set_socket_timeout`]: crate::net::sockopt::set_socket_timeout.
-/// [`get_socket_timeout`]: crate::net::sockopt::get_socket_timeout.
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
 #[repr(u32)]
 pub enum Timeout {
@@ -41,759 +197,241 @@ pub enum Timeout {
 
 /// `getsockopt(fd, SOL_SOCKET, SO_TYPE)`—Returns the type of a socket.
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `getsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/getsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/getsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/getsockopt
-/// [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_TYPE")]
 pub fn get_socket_type<Fd: AsFd>(fd: Fd) -> io::Result<SocketType> {
-    backend::net::syscalls::sockopt::get_socket_type(fd.as_fd())
+    backend::net::sockopt::get_socket_type(fd.as_fd())
 }
 
-/// `setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, value)`
+/// `setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, value)`—Set whether local
+/// addresses may be reused in `bind`.
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `setsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/setsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/setsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/setsockopt
-/// [glibc `setsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_REUSEADDR")]
 pub fn set_socket_reuseaddr<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_socket_reuseaddr(fd.as_fd(), value)
+    backend::net::sockopt::set_socket_reuseaddr(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, SOL_SOCKET, SO_REUSEADDR)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `getsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/getsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/getsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/getsockopt
-/// [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_REUSEADDR")]
 pub fn get_socket_reuseaddr<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
-    backend::net::syscalls::sockopt::get_socket_reuseaddr(fd.as_fd())
+    backend::net::sockopt::get_socket_reuseaddr(fd.as_fd())
 }
 
-/// `setsockopt(fd, SOL_SOCKET, SO_BROADCAST, broadcast)`
+/// `setsockopt(fd, SOL_SOCKET, SO_BROADCAST, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `setsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/setsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/setsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/setsockopt
-/// [glibc `setsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_BROADCAST")]
-pub fn set_socket_broadcast<Fd: AsFd>(fd: Fd, broadcast: bool) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_socket_broadcast(fd.as_fd(), broadcast)
+pub fn set_socket_broadcast<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_broadcast(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, SOL_SOCKET, SO_BROADCAST)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `getsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/getsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/getsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/getsockopt
-/// [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_BROADCAST")]
 pub fn get_socket_broadcast<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
-    backend::net::syscalls::sockopt::get_socket_broadcast(fd.as_fd())
+    backend::net::sockopt::get_socket_broadcast(fd.as_fd())
 }
 
-/// `setsockopt(fd, SOL_SOCKET, SO_LINGER, linger)`
+/// `setsockopt(fd, SOL_SOCKET, SO_LINGER, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `setsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/setsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/setsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/setsockopt
-/// [glibc `setsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_LINGER")]
-pub fn set_socket_linger<Fd: AsFd>(fd: Fd, linger: Option<Duration>) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_socket_linger(fd.as_fd(), linger)
+pub fn set_socket_linger<Fd: AsFd>(fd: Fd, value: Option<Duration>) -> io::Result<()> {
+    backend::net::sockopt::set_socket_linger(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, SOL_SOCKET, SO_LINGER)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `getsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/getsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/getsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/getsockopt
-/// [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_LINGER")]
 pub fn get_socket_linger<Fd: AsFd>(fd: Fd) -> io::Result<Option<Duration>> {
-    backend::net::syscalls::sockopt::get_socket_linger(fd.as_fd())
+    backend::net::sockopt::get_socket_linger(fd.as_fd())
 }
 
-/// `setsockopt(fd, SOL_SOCKET, SO_PASSCRED, passcred)`
+/// `setsockopt(fd, SOL_SOCKET, SO_PASSCRED, value)`
 ///
-/// # References
-///  - [Linux `setsockopt`]
-///  - [Linux `socket`]
+/// See the [module-level documentation] for more.
 ///
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[cfg(linux_kernel)]
 #[inline]
 #[doc(alias = "SO_PASSCRED")]
-pub fn set_socket_passcred<Fd: AsFd>(fd: Fd, passcred: bool) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_socket_passcred(fd.as_fd(), passcred)
+pub fn set_socket_passcred<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_passcred(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, SOL_SOCKET, SO_PASSCRED)`
 ///
-/// # References
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
+/// See the [module-level documentation] for more.
 ///
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[cfg(linux_kernel)]
 #[inline]
 #[doc(alias = "SO_PASSCRED")]
 pub fn get_socket_passcred<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
-    backend::net::syscalls::sockopt::get_socket_passcred(fd.as_fd())
+    backend::net::sockopt::get_socket_passcred(fd.as_fd())
 }
 
-/// `setsockopt(fd, SOL_SOCKET, id, timeout)`—Set the sending or receiving
+/// `setsockopt(fd, SOL_SOCKET, id, value)`—Set the sending or receiving
 /// timeout.
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `setsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/setsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/setsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/setsockopt
-/// [glibc `setsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_RCVTIMEO")]
 #[doc(alias = "SO_SNDTIMEO")]
 pub fn set_socket_timeout<Fd: AsFd>(
     fd: Fd,
     id: Timeout,
-    timeout: Option<Duration>,
+    value: Option<Duration>,
 ) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_socket_timeout(fd.as_fd(), id, timeout)
+    backend::net::sockopt::set_socket_timeout(fd.as_fd(), id, value)
 }
 
 /// `getsockopt(fd, SOL_SOCKET, id)`—Get the sending or receiving timeout.
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `getsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/getsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/getsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/getsockopt
-/// [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_RCVTIMEO")]
 #[doc(alias = "SO_SNDTIMEO")]
 pub fn get_socket_timeout<Fd: AsFd>(fd: Fd, id: Timeout) -> io::Result<Option<Duration>> {
-    backend::net::syscalls::sockopt::get_socket_timeout(fd.as_fd(), id)
+    backend::net::sockopt::get_socket_timeout(fd.as_fd(), id)
 }
 
 /// `getsockopt(fd, SOL_SOCKET, SO_ERROR)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `getsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/getsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/getsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/getsockopt
-/// [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_ERROR")]
 pub fn get_socket_error<Fd: AsFd>(fd: Fd) -> io::Result<Result<(), io::Errno>> {
-    backend::net::syscalls::sockopt::get_socket_error(fd.as_fd())
+    backend::net::sockopt::get_socket_error(fd.as_fd())
 }
 
 /// `getsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `getsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/getsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/getsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/getsockopt
-/// [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
-#[cfg(any(apple, target_os = "freebsd"))]
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(any(apple, freebsdlike, target_os = "netbsd"))]
 #[doc(alias = "SO_NOSIGPIPE")]
 #[inline]
 pub fn get_socket_nosigpipe<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
-    backend::net::syscalls::sockopt::get_socket_nosigpipe(fd.as_fd())
+    backend::net::sockopt::get_socket_nosigpipe(fd.as_fd())
 }
 
-/// `setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, val)`
+/// `setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `setsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/setsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/setsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/setsockopt
-/// [glibc `setsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
-#[cfg(any(apple, target_os = "freebsd"))]
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(any(apple, freebsdlike, target_os = "netbsd"))]
 #[doc(alias = "SO_NOSIGPIPE")]
 #[inline]
-pub fn set_socket_nosigpipe<Fd: AsFd>(fd: Fd, val: bool) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_socket_nosigpipe(fd.as_fd(), val)
+pub fn set_socket_nosigpipe<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_nosigpipe(fd.as_fd(), value)
 }
 
-/// `setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, keepalive)`
+/// `setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `setsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/setsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/setsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/setsockopt
-/// [glibc `setsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_KEEPALIVE")]
-pub fn set_socket_keepalive<Fd: AsFd>(fd: Fd, keepalive: bool) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_socket_keepalive(fd.as_fd(), keepalive)
+pub fn set_socket_keepalive<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_keepalive(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, SOL_SOCKET, SO_KEEPALIVE)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `getsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/getsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/getsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/getsockopt
-/// [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_KEEPALIVE")]
 pub fn get_socket_keepalive<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
-    backend::net::syscalls::sockopt::get_socket_keepalive(fd.as_fd())
+    backend::net::sockopt::get_socket_keepalive(fd.as_fd())
 }
 
-/// `setsockopt(fd, SOL_SOCKET, SO_RCVBUF, size)`
+/// `setsockopt(fd, SOL_SOCKET, SO_RCVBUF, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `setsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/setsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/setsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/setsockopt
-/// [glibc `setsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_RCVBUF")]
-pub fn set_socket_recv_buffer_size<Fd: AsFd>(fd: Fd, size: usize) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_socket_recv_buffer_size(fd.as_fd(), size)
+pub fn set_socket_recv_buffer_size<Fd: AsFd>(fd: Fd, value: usize) -> io::Result<()> {
+    backend::net::sockopt::set_socket_recv_buffer_size(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, SOL_SOCKET, SO_RCVBUF)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `getsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/getsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/getsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/getsockopt
-/// [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_RCVBUF")]
 pub fn get_socket_recv_buffer_size<Fd: AsFd>(fd: Fd) -> io::Result<usize> {
-    backend::net::syscalls::sockopt::get_socket_recv_buffer_size(fd.as_fd())
+    backend::net::sockopt::get_socket_recv_buffer_size(fd.as_fd())
 }
 
-/// `setsockopt(fd, SOL_SOCKET, SO_SNDBUF, size)`
+/// `setsockopt(fd, SOL_SOCKET, SO_SNDBUF, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `setsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/setsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/setsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/setsockopt
-/// [glibc `setsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_SNDBUF")]
-pub fn set_socket_send_buffer_size<Fd: AsFd>(fd: Fd, size: usize) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_socket_send_buffer_size(fd.as_fd(), size)
+pub fn set_socket_send_buffer_size<Fd: AsFd>(fd: Fd, value: usize) -> io::Result<()> {
+    backend::net::sockopt::set_socket_send_buffer_size(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, SOL_SOCKET, SO_SNDBUF)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `getsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/getsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/getsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/getsockopt
-/// [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "SO_SNDBUF")]
 pub fn get_socket_send_buffer_size<Fd: AsFd>(fd: Fd) -> io::Result<usize> {
-    backend::net::syscalls::sockopt::get_socket_send_buffer_size(fd.as_fd())
+    backend::net::sockopt::get_socket_send_buffer_size(fd.as_fd())
 }
 
 /// `getsockopt(fd, SOL_SOCKET, SO_DOMAIN)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `getsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/getsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/getsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/getsockopt
-/// [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[cfg(not(any(
     apple,
     windows,
@@ -804,709 +442,314 @@ pub fn get_socket_send_buffer_size<Fd: AsFd>(fd: Fd) -> io::Result<usize> {
     target_os = "haiku",
     target_os = "netbsd",
     target_os = "nto",
+    target_os = "vita",
 )))]
 #[inline]
 #[doc(alias = "SO_DOMAIN")]
 pub fn get_socket_domain<Fd: AsFd>(fd: Fd) -> io::Result<AddressFamily> {
-    backend::net::syscalls::sockopt::get_socket_domain(fd.as_fd())
+    backend::net::sockopt::get_socket_domain(fd.as_fd())
 }
 
 /// `getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `sys/socket.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `socket`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `SOL_SOCKET` options]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc `getsockopt`]
-///  - [glibc `SOL_SOCKET` Options]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `sys/socket.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_socket.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `socket`]: https://man7.org/linux/man-pages/man7/socket.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `SOL_SOCKET` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/sol-socket-socket-options
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [NetBSD]: https://man.netbsd.org/getsockopt.2
-/// [OpenBSD]: https://man.openbsd.org/getsockopt.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/getsockopt
-/// [glibc `getsockopt`]: https://www.gnu.org/software/libc/manual/html_node/Socket-Option-Functions.html
-/// [glibc `SOL_SOCKET` options]: https://www.gnu.org/software/libc/manual/html_node/Socket_002dLevel-Options.html
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[cfg(not(apple))] // Apple platforms declare the constant, but do not actually implement it.
 #[inline]
 #[doc(alias = "SO_ACCEPTCONN")]
 pub fn get_socket_acceptconn<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
-    backend::net::syscalls::sockopt::get_socket_acceptconn(fd.as_fd())
+    backend::net::sockopt::get_socket_acceptconn(fd.as_fd())
 }
 
-/// `setsockopt(fd, IPPROTO_IP, IP_TTL, ttl)`
+/// `setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `ip`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `IPPROTO_IP` options]
-///  - [Apple `setsockopt`]
-///  - [Apple `ip`]
-///  - [FreeBSD `setsockopt`]
-///  - [FreeBSD `ip`]
-///  - [NetBSD `setsockopt`]
-///  - [NetBSD `ip`]
-///  - [OpenBSD `setsockopt`]
-///  - [OpenBSD `ip`]
-///  - [DragonFly BSD `setsockopt`]
-///  - [DragonFly BSD `ip`]
-///  - [illumos `setsockopt`]
-///  - [illumos `ip`]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `ip`]: https://man7.org/linux/man-pages/man7/ip.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `IPPROTO_IP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `ip`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `ip`]: https://man.freebsd.org/cgi/man.cgi?query=ip&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `ip`]: https://man.netbsd.org/ip.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `ip`]: https://man.openbsd.org/ip.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `ip`]: https://man.dragonflybsd.org/?command=ip&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `ip`]: https://illumos.org/man/4P/ip
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_OOBINLINE")]
+pub fn set_socket_oobinline<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_oobinline(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_OOBINLINE)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[inline]
+#[doc(alias = "SO_OOBINLINE")]
+pub fn get_socket_oobinline<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_socket_oobinline(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(not(any(solarish, windows)))]
+#[cfg(not(windows))]
+#[inline]
+#[doc(alias = "SO_REUSEPORT")]
+pub fn set_socket_reuseport<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_reuseport(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_REUSEPORT)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(not(any(solarish, windows)))]
+#[inline]
+#[doc(alias = "SO_REUSEPORT")]
+pub fn get_socket_reuseport<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_socket_reuseport(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_REUSEPORT_LB, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(target_os = "freebsd")]
+#[inline]
+#[doc(alias = "SO_REUSEPORT_LB")]
+pub fn set_socket_reuseport_lb<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_socket_reuseport_lb(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_REUSEPORT_LB)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(target_os = "freebsd")]
+#[inline]
+#[doc(alias = "SO_REUSEPORT_LB")]
+pub fn get_socket_reuseport_lb<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_socket_reuseport_lb(fd.as_fd())
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_PROTOCOL)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(any(
+    linux_kernel,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "openbsd",
+    target_os = "redox",
+    target_env = "newlib"
+))]
+#[inline]
+#[doc(alias = "SO_PROTOCOL")]
+pub fn get_socket_protocol<Fd: AsFd>(fd: Fd) -> io::Result<Option<Protocol>> {
+    backend::net::sockopt::get_socket_protocol(fd.as_fd())
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_COOKIE)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(target_os = "linux")]
+#[inline]
+#[doc(alias = "SO_COOKIE")]
+pub fn get_socket_cookie<Fd: AsFd>(fd: Fd) -> io::Result<u64> {
+    backend::net::sockopt::get_socket_cookie(fd.as_fd())
+}
+
+/// `getsockopt(fd, SOL_SOCKET, SO_INCOMING_CPU)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(target_os = "linux")]
+#[inline]
+#[doc(alias = "SO_INCOMING_CPU")]
+pub fn get_socket_incoming_cpu<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    backend::net::sockopt::get_socket_incoming_cpu(fd.as_fd())
+}
+
+/// `setsockopt(fd, SOL_SOCKET, SO_INCOMING_CPU, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
+#[cfg(target_os = "linux")]
+#[inline]
+#[doc(alias = "SO_INCOMING_CPU")]
+pub fn set_socket_incoming_cpu<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_socket_incoming_cpu(fd.as_fd(), value)
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_TTL, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_socket_-and-set_socket_-functions
 #[inline]
 #[doc(alias = "IP_TTL")]
-pub fn set_ip_ttl<Fd: AsFd>(fd: Fd, ttl: u32) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_ip_ttl(fd.as_fd(), ttl)
+pub fn set_ip_ttl<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_ip_ttl(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, IPPROTO_IP, IP_TTL)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `ip`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_IP` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `ip`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `ip`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `ip`]
-///  - [OpenBSD `getsockopt`]
-///  - [OpenBSD `ip`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `ip`]
-///  - [illumos `getsockopt`]
-///  - [illumos `ip`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `ip`]: https://man7.org/linux/man-pages/man7/ip.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_IP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `ip`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `ip`]: https://man.freebsd.org/cgi/man.cgi?query=ip&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `ip`]: https://man.netbsd.org/ip.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `ip`]: https://man.openbsd.org/ip.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `ip`]: https://man.dragonflybsd.org/?command=ip&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `ip`]: https://illumos.org/man/4P/ip
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
 #[inline]
 #[doc(alias = "IP_TTL")]
 pub fn get_ip_ttl<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
-    backend::net::syscalls::sockopt::get_ip_ttl(fd.as_fd())
+    backend::net::sockopt::get_ip_ttl(fd.as_fd())
 }
 
-/// `setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, only_v6)`
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `ipv6`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `IPPROTO_IPV6` options]
-///  - [Apple `setsockopt`]
-///  - [Apple `ip6`]
-///  - [FreeBSD `setsockopt`]
-///  - [FreeBSD `ip6`]
-///  - [NetBSD `setsockopt`]
-///  - [NetBSD `ip6`]
-///  - [OpenBSD `setsockopt`]
-///  - [OpenBSD `ip6`]
-///  - [DragonFly BSD `setsockopt`]
-///  - [DragonFly BSD `ip6`]
-///  - [illumos `setsockopt`]
-///  - [illumos `ip6`]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `ipv6`]: https://man7.org/linux/man-pages/man7/ipv6.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `IPPROTO_IPV6` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `ip6`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip6.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `ip6`]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `ip6`]: https://man.netbsd.org/ip6.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `ip6`]: https://man.openbsd.org/ip6.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `ip6`]: https://man.dragonflybsd.org/?command=ip6&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `ip6`]: https://illumos.org/man/4P/ip6
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
 #[inline]
 #[doc(alias = "IPV6_V6ONLY")]
-pub fn set_ipv6_v6only<Fd: AsFd>(fd: Fd, only_v6: bool) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_ipv6_v6only(fd.as_fd(), only_v6)
+pub fn set_ipv6_v6only<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_v6only(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `ipv6`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_IPV6` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `ip6`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `ip6`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `ip6`]
-///  - [OpenBSD `getsockopt`]
-///  - [OpenBSD `ip6`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `ip6`]
-///  - [illumos `getsockopt`]
-///  - [illumos `ip6`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `ipv6`]: https://man7.org/linux/man-pages/man7/ipv6.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_IPV6` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
-/// [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [Apple `ip6`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip6.4.auto.html
-/// [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [FreeBSD `ip6`]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4
-/// [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
-/// [NetBSD `ip6`]: https://man.netbsd.org/ip6.4
-/// [OpenBSD `getsockopt`]: https://man.openbsd.org/getsockopt.2
-/// [OpenBSD `ip6`]: https://man.openbsd.org/ip6.4
-/// [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [DragonFly BSD `ip6`]: https://man.dragonflybsd.org/?command=ip6&section=4
-/// [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
-/// [illumos `ip6`]: https://illumos.org/man/4P/ip6
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
 #[inline]
 #[doc(alias = "IPV6_V6ONLY")]
 pub fn get_ipv6_v6only<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
-    backend::net::syscalls::sockopt::get_ipv6_v6only(fd.as_fd())
+    backend::net::sockopt::get_ipv6_v6only(fd.as_fd())
 }
 
-/// `setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, multicast_loop)`
+/// `setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `ip`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `IPPROTO_IP` options]
-///  - [Apple `setsockopt`]
-///  - [Apple `ip`]
-///  - [FreeBSD `setsockopt`]
-///  - [FreeBSD `ip`]
-///  - [NetBSD `setsockopt`]
-///  - [NetBSD `ip`]
-///  - [OpenBSD `setsockopt`]
-///  - [OpenBSD `ip`]
-///  - [DragonFly BSD `setsockopt`]
-///  - [DragonFly BSD `ip`]
-///  - [illumos `setsockopt`]
-///  - [illumos `ip`]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `ip`]: https://man7.org/linux/man-pages/man7/ip.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `IPPROTO_IP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `ip`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `ip`]: https://man.freebsd.org/cgi/man.cgi?query=ip&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `ip`]: https://man.netbsd.org/ip.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `ip`]: https://man.openbsd.org/ip.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `ip`]: https://man.dragonflybsd.org/?command=ip&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `ip`]: https://illumos.org/man/4P/ip
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
 #[inline]
 #[doc(alias = "IP_MULTICAST_LOOP")]
-pub fn set_ip_multicast_loop<Fd: AsFd>(fd: Fd, multicast_loop: bool) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_ip_multicast_loop(fd.as_fd(), multicast_loop)
+pub fn set_ip_multicast_loop<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ip_multicast_loop(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `ip`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_IP` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `ip`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `ip`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `ip`]
-///  - [OpenBSD `getsockopt`]
-///  - [OpenBSD `ip`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `ip`]
-///  - [illumos `getsockopt`]
-///  - [illumos `ip`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `ip`]: https://man7.org/linux/man-pages/man7/ip.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_IP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
 #[inline]
 #[doc(alias = "IP_MULTICAST_LOOP")]
 pub fn get_ip_multicast_loop<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
-    backend::net::syscalls::sockopt::get_ip_multicast_loop(fd.as_fd())
+    backend::net::sockopt::get_ip_multicast_loop(fd.as_fd())
 }
 
-/// `setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, multicast_ttl)`
+/// `setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `ip`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `IPPROTO_IP` options]
-///  - [Apple `setsockopt`]
-///  - [Apple `ip`]
-///  - [FreeBSD `setsockopt`]
-///  - [FreeBSD `ip`]
-///  - [NetBSD `setsockopt`]
-///  - [NetBSD `ip`]
-///  - [OpenBSD `setsockopt`]
-///  - [OpenBSD `ip`]
-///  - [DragonFly BSD `setsockopt`]
-///  - [DragonFly BSD `ip`]
-///  - [illumos `setsockopt`]
-///  - [illumos `ip`]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `ip`]: https://man7.org/linux/man-pages/man7/ip.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `IPPROTO_IP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `ip`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `ip`]: https://man.freebsd.org/cgi/man.cgi?query=ip&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `ip`]: https://man.netbsd.org/ip.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `ip`]: https://man.openbsd.org/ip.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `ip`]: https://man.dragonflybsd.org/?command=ip&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `ip`]: https://illumos.org/man/4P/ip
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
 #[inline]
 #[doc(alias = "IP_MULTICAST_TTL")]
-pub fn set_ip_multicast_ttl<Fd: AsFd>(fd: Fd, multicast_ttl: u32) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_ip_multicast_ttl(fd.as_fd(), multicast_ttl)
+pub fn set_ip_multicast_ttl<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_ip_multicast_ttl(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `ip`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_IP` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `ip`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `ip`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `ip`]
-///  - [OpenBSD `getsockopt`]
-///  - [OpenBSD `ip`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `ip`]
-///  - [illumos `getsockopt`]
-///  - [illumos `ip`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `ip`]: https://man7.org/linux/man-pages/man7/ip.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_IP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
 #[inline]
 #[doc(alias = "IP_MULTICAST_TTL")]
 pub fn get_ip_multicast_ttl<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
-    backend::net::syscalls::sockopt::get_ip_multicast_ttl(fd.as_fd())
+    backend::net::sockopt::get_ip_multicast_ttl(fd.as_fd())
 }
 
-/// `setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, multicast_loop)`
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `ipv6`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `IPPROTO_IPV6` options]
-///  - [Apple `setsockopt`]
-///  - [Apple `ip6`]
-///  - [FreeBSD `setsockopt`]
-///  - [FreeBSD `ip6`]
-///  - [NetBSD `setsockopt`]
-///  - [NetBSD `ip6`]
-///  - [OpenBSD `setsockopt`]
-///  - [OpenBSD `ip6`]
-///  - [DragonFly BSD `setsockopt`]
-///  - [DragonFly BSD `ip6`]
-///  - [illumos `setsockopt`]
-///  - [illumos `ip6`]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `ipv6`]: https://man7.org/linux/man-pages/man7/ipv6.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `IPPROTO_IPV6` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `ip6`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip6.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `ip6`]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `ip6`]: https://man.netbsd.org/ip6.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `ip6`]: https://man.openbsd.org/ip6.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `ip6`]: https://man.dragonflybsd.org/?command=ip6&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `ip6`]: https://illumos.org/man/4P/ip6
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
 #[inline]
 #[doc(alias = "IPV6_MULTICAST_LOOP")]
-pub fn set_ipv6_multicast_loop<Fd: AsFd>(fd: Fd, multicast_loop: bool) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_ipv6_multicast_loop(fd.as_fd(), multicast_loop)
+pub fn set_ipv6_multicast_loop<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_multicast_loop(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `ipv6`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_IPV6` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `ip6`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `ip6`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `ip6`]
-///  - [OpenBSD `getsockopt`]
-///  - [OpenBSD `ip6`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `ip6`]
-///  - [illumos `getsockopt`]
-///  - [illumos `ip6`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `ipv6`]: https://man7.org/linux/man-pages/man7/ipv6.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_IPV6` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
-/// [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [Apple `ip6`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip6.4.auto.html
-/// [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [FreeBSD `ip6`]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4
-/// [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
-/// [NetBSD `ip6`]: https://man.netbsd.org/ip6.4
-/// [OpenBSD `getsockopt`]: https://man.openbsd.org/getsockopt.2
-/// [OpenBSD `ip6`]: https://man.openbsd.org/ip6.4
-/// [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [DragonFly BSD `ip6`]: https://man.dragonflybsd.org/?command=ip6&section=4
-/// [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
-/// [illumos `ip6`]: https://illumos.org/man/4P/ip6
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
 #[inline]
 #[doc(alias = "IPV6_MULTICAST_LOOP")]
 pub fn get_ipv6_multicast_loop<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
-    backend::net::syscalls::sockopt::get_ipv6_multicast_loop(fd.as_fd())
+    backend::net::sockopt::get_ipv6_multicast_loop(fd.as_fd())
 }
 
-/// `setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, multicast_hops)`
+/// `getsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `ipv6`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `IPPROTO_IPV6` options]
-///  - [Apple `setsockopt`]
-///  - [Apple `ip6`]
-///  - [FreeBSD `setsockopt`]
-///  - [FreeBSD `ip6`]
-///  - [NetBSD `setsockopt`]
-///  - [NetBSD `ip6`]
-///  - [OpenBSD `setsockopt`]
-///  - [OpenBSD `ip6`]
-///  - [DragonFly BSD `setsockopt`]
-///  - [DragonFly BSD `ip6`]
-///  - [illumos `setsockopt`]
-///  - [illumos `ip6`]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `ipv6`]: https://man7.org/linux/man-pages/man7/ipv6.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `IPPROTO_IPV6` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `ip6`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip6.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `ip6`]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `ip6`]: https://man.netbsd.org/ip6.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `ip6`]: https://man.openbsd.org/ip6.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `ip6`]: https://man.dragonflybsd.org/?command=ip6&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `ip6`]: https://illumos.org/man/4P/ip6
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
 #[inline]
-#[doc(alias = "IP_MULTICAST_TTL")]
-pub fn set_ipv6_multicast_hops<Fd: AsFd>(fd: Fd, multicast_hops: u32) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_ipv6_multicast_hops(fd.as_fd(), multicast_hops)
+#[doc(alias = "IPV6_UNICAST_HOPS")]
+pub fn get_ipv6_unicast_hops<Fd: AsFd>(fd: Fd) -> io::Result<u8> {
+    backend::net::sockopt::get_ipv6_unicast_hops(fd.as_fd())
 }
 
-/// `getsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS)`
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, value)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `ipv6`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_IPV6` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `ip6`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `ip6`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `ip6`]
-///  - [OpenBSD `getsockopt`]
-///  - [OpenBSD `ip6`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `ip6`]
-///  - [illumos `getsockopt`]
-///  - [illumos `ip6`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `ipv6`]: https://man7.org/linux/man-pages/man7/ipv6.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_IPV6` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
-/// [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [Apple `ip6`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip6.4.auto.html
-/// [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [FreeBSD `ip6`]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4
-/// [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
-/// [NetBSD `ip6`]: https://man.netbsd.org/ip6.4
-/// [OpenBSD `getsockopt`]: https://man.openbsd.org/getsockopt.2
-/// [OpenBSD `ip6`]: https://man.openbsd.org/ip6.4
-/// [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [DragonFly BSD `ip6`]: https://man.dragonflybsd.org/?command=ip6&section=4
-/// [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
-/// [illumos `ip6`]: https://illumos.org/man/4P/ip6
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
 #[inline]
 #[doc(alias = "IPV6_UNICAST_HOPS")]
-pub fn get_ipv6_unicast_hops<Fd: AsFd>(fd: Fd) -> io::Result<u8> {
-    backend::net::syscalls::sockopt::get_ipv6_unicast_hops(fd.as_fd())
+pub fn set_ipv6_unicast_hops<Fd: AsFd>(fd: Fd, value: Option<u8>) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_unicast_hops(fd.as_fd(), value)
 }
 
-/// `setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, unicast_hops)`
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `ipv6`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `IPPROTO_IPV6` options]
-///  - [Apple `setsockopt`]
-///  - [Apple `ip6`]
-///  - [FreeBSD `setsockopt`]
-///  - [FreeBSD `ip6`]
-///  - [NetBSD `setsockopt`]
-///  - [NetBSD `ip6`]
-///  - [OpenBSD `setsockopt`]
-///  - [OpenBSD `ip6`]
-///  - [DragonFly BSD `setsockopt`]
-///  - [DragonFly BSD `ip6`]
-///  - [illumos `setsockopt`]
-///  - [illumos `ip6`]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `ipv6`]: https://man7.org/linux/man-pages/man7/ipv6.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `IPPROTO_IPV6` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `ip6`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip6.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `ip6`]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `ip6`]: https://man.netbsd.org/ip6.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `ip6`]: https://man.openbsd.org/ip6.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `ip6`]: https://man.dragonflybsd.org/?command=ip6&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `ip6`]: https://illumos.org/man/4P/ip6
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
 #[inline]
-#[doc(alias = "IPV6_UNICAST_HOPS")]
-pub fn set_ipv6_unicast_hops<Fd: AsFd>(fd: Fd, unicast_hops: Option<u8>) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_ipv6_unicast_hops(fd.as_fd(), unicast_hops)
+#[doc(alias = "IPV6_MULTICAST_HOPS")]
+pub fn set_ipv6_multicast_hops<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_multicast_hops(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `ipv6`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_IPV6` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `ip6`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `ip6`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `ip6`]
-///  - [OpenBSD `getsockopt`]
-///  - [OpenBSD `ip6`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `ip6`]
-///  - [illumos `getsockopt`]
-///  - [illumos `ip6`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `ipv6`]: https://man7.org/linux/man-pages/man7/ipv6.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_IPV6` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
-/// [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [Apple `ip6`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip6.4.auto.html
-/// [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [FreeBSD `ip6`]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4
-/// [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
-/// [NetBSD `ip6`]: https://man.netbsd.org/ip6.4
-/// [OpenBSD `getsockopt`]: https://man.openbsd.org/getsockopt.2
-/// [OpenBSD `ip6`]: https://man.openbsd.org/ip6.4
-/// [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [DragonFly BSD `ip6`]: https://man.dragonflybsd.org/?command=ip6&section=4
-/// [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
-/// [illumos `ip6`]: https://illumos.org/man/4P/ip6
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
 #[inline]
-#[doc(alias = "IP_MULTICAST_TTL")]
+#[doc(alias = "IPV6_MULTICAST_HOPS")]
 pub fn get_ipv6_multicast_hops<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
-    backend::net::syscalls::sockopt::get_ipv6_multicast_hops(fd.as_fd())
+    backend::net::sockopt::get_ipv6_multicast_hops(fd.as_fd())
 }
 
 /// `setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, multiaddr, interface)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `ip`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `IPPROTO_IP` options]
-///  - [Apple `setsockopt`]
-///  - [Apple `ip`]
-///  - [FreeBSD `setsockopt`]
-///  - [FreeBSD `ip`]
-///  - [NetBSD `setsockopt`]
-///  - [NetBSD `ip`]
-///  - [OpenBSD `setsockopt`]
-///  - [OpenBSD `ip`]
-///  - [DragonFly BSD `setsockopt`]
-///  - [DragonFly BSD `ip`]
-///  - [illumos `setsockopt`]
-///  - [illumos `ip`]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `ip`]: https://man7.org/linux/man-pages/man7/ip.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `IPPROTO_IP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `ip`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `ip`]: https://man.freebsd.org/cgi/man.cgi?query=ip&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `ip`]: https://man.netbsd.org/ip.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `ip`]: https://man.openbsd.org/ip.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `ip`]: https://man.dragonflybsd.org/?command=ip&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `ip`]: https://illumos.org/man/4P/ip
+/// This is similar to [`set_ip_add_membership`] but always sets `ifindex`
+/// value to zero.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
 #[inline]
 #[doc(alias = "IP_ADD_MEMBERSHIP")]
 pub fn set_ip_add_membership<Fd: AsFd>(
@@ -1514,51 +757,90 @@ pub fn set_ip_add_membership<Fd: AsFd>(
     multiaddr: &Ipv4Addr,
     interface: &Ipv4Addr,
 ) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_ip_add_membership(fd.as_fd(), multiaddr, interface)
+    backend::net::sockopt::set_ip_add_membership(fd.as_fd(), multiaddr, interface)
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, multiaddr, address,
+/// ifindex)`
+///
+/// This is similar to [`set_ip_add_membership_with_ifindex`] but additionally
+/// allows a `ifindex` value to be given.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(
+    apple,
+    freebsdlike,
+    linux_like,
+    target_os = "fuchsia",
+    target_os = "openbsd"
+))]
+#[inline]
+#[doc(alias = "IP_ADD_MEMBERSHIP")]
+pub fn set_ip_add_membership_with_ifindex<Fd: AsFd>(
+    fd: Fd,
+    multiaddr: &Ipv4Addr,
+    address: &Ipv4Addr,
+    ifindex: i32,
+) -> io::Result<()> {
+    backend::net::sockopt::set_ip_add_membership_with_ifindex(
+        fd.as_fd(),
+        multiaddr,
+        address,
+        ifindex,
+    )
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_ADD_SOURCE_MEMBERSHIP, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(apple, freebsdlike, linux_like, solarish, target_os = "aix"))]
+#[inline]
+#[doc(alias = "IP_ADD_SOURCE_MEMBERSHIP")]
+pub fn set_ip_add_source_membership<Fd: AsFd>(
+    fd: Fd,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> io::Result<()> {
+    backend::net::sockopt::set_ip_add_source_membership(
+        fd.as_fd(),
+        multiaddr,
+        interface,
+        sourceaddr,
+    )
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_DROP_SOURCE_MEMBERSHIP, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(apple, freebsdlike, linux_like, solarish, target_os = "aix"))]
+#[inline]
+#[doc(alias = "IP_DROP_SOURCE_MEMBERSHIP")]
+pub fn set_ip_drop_source_membership<Fd: AsFd>(
+    fd: Fd,
+    multiaddr: &Ipv4Addr,
+    interface: &Ipv4Addr,
+    sourceaddr: &Ipv4Addr,
+) -> io::Result<()> {
+    backend::net::sockopt::set_ip_drop_source_membership(
+        fd.as_fd(),
+        multiaddr,
+        interface,
+        sourceaddr,
+    )
 }
 
 /// `setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, multiaddr, interface)`
 ///
-/// `IPV6_ADD_MEMBERSHIP` is the same as `IPV6_JOIN_GROUP` in POSIX.
+/// See the [module-level documentation] for more.
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `ipv6`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `IPPROTO_IPV6` options]
-///  - [Apple `setsockopt`]
-///  - [Apple `ip6`]
-///  - [FreeBSD `setsockopt`]
-///  - [FreeBSD `ip6`]
-///  - [NetBSD `setsockopt`]
-///  - [NetBSD `ip6`]
-///  - [OpenBSD `setsockopt`]
-///  - [OpenBSD `ip6`]
-///  - [DragonFly BSD `setsockopt`]
-///  - [DragonFly BSD `ip6`]
-///  - [illumos `setsockopt`]
-///  - [illumos `ip6`]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `ipv6`]: https://man7.org/linux/man-pages/man7/ipv6.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `IPPROTO_IPV6` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `ip6`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip6.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `ip6`]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `ip6`]: https://man.netbsd.org/ip6.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `ip6`]: https://man.openbsd.org/ip6.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `ip6`]: https://man.dragonflybsd.org/?command=ip6&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `ip6`]: https://illumos.org/man/4P/ip6
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
 #[inline]
 #[doc(alias = "IPV6_JOIN_GROUP")]
 #[doc(alias = "IPV6_ADD_MEMBERSHIP")]
@@ -1567,49 +849,17 @@ pub fn set_ipv6_add_membership<Fd: AsFd>(
     multiaddr: &Ipv6Addr,
     interface: u32,
 ) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_ipv6_add_membership(fd.as_fd(), multiaddr, interface)
+    backend::net::sockopt::set_ipv6_add_membership(fd.as_fd(), multiaddr, interface)
 }
 
 /// `setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, multiaddr, interface)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `ip`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `IPPROTO_IP` options]
-///  - [Apple `setsockopt`]
-///  - [Apple `ip`]
-///  - [FreeBSD `setsockopt`]
-///  - [FreeBSD `ip`]
-///  - [NetBSD `setsockopt`]
-///  - [NetBSD `ip`]
-///  - [OpenBSD `setsockopt`]
-///  - [OpenBSD `ip`]
-///  - [DragonFly BSD `setsockopt`]
-///  - [DragonFly BSD `ip`]
-///  - [illumos `setsockopt`]
-///  - [illumos `ip`]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `ip`]: https://man7.org/linux/man-pages/man7/ip.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `IPPROTO_IP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `ip`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `ip`]: https://man.freebsd.org/cgi/man.cgi?query=ip&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `ip`]: https://man.netbsd.org/ip.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `ip`]: https://man.openbsd.org/ip.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `ip`]: https://man.dragonflybsd.org/?command=ip&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `ip`]: https://illumos.org/man/4P/ip
+/// This is similar to [`set_ip_drop_membership`] but always sets `ifindex`
+/// value to zero.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
 #[inline]
 #[doc(alias = "IP_DROP_MEMBERSHIP")]
 pub fn set_ip_drop_membership<Fd: AsFd>(
@@ -1617,51 +867,45 @@ pub fn set_ip_drop_membership<Fd: AsFd>(
     multiaddr: &Ipv4Addr,
     interface: &Ipv4Addr,
 ) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_ip_drop_membership(fd.as_fd(), multiaddr, interface)
+    backend::net::sockopt::set_ip_drop_membership(fd.as_fd(), multiaddr, interface)
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, multiaddr, interface)`
+///
+/// This is similar to [`set_ip_drop_membership_with_ifindex`] but additionally
+/// allows a `ifindex` value to be given.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(
+    apple,
+    freebsdlike,
+    linux_like,
+    target_os = "fuchsia",
+    target_os = "openbsd"
+))]
+#[inline]
+#[doc(alias = "IP_DROP_MEMBERSHIP")]
+pub fn set_ip_drop_membership_with_ifindex<Fd: AsFd>(
+    fd: Fd,
+    multiaddr: &Ipv4Addr,
+    address: &Ipv4Addr,
+    ifindex: i32,
+) -> io::Result<()> {
+    backend::net::sockopt::set_ip_drop_membership_with_ifindex(
+        fd.as_fd(),
+        multiaddr,
+        address,
+        ifindex,
+    )
 }
 
 /// `setsockopt(fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, multiaddr, interface)`
 ///
-/// `IPV6_DROP_MEMBERSHIP` is the same as `IPV6_LEAVE_GROUP` in POSIX.
+/// See the [module-level documentation] for more.
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `netinet/in.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `ipv6`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `IPPROTO_IPV6` options]
-///  - [Apple `setsockopt`]
-///  - [Apple `ip6`]
-///  - [FreeBSD `setsockopt`]
-///  - [FreeBSD `ip6`]
-///  - [NetBSD `setsockopt`]
-///  - [NetBSD `ip6`]
-///  - [OpenBSD `setsockopt`]
-///  - [OpenBSD `ip6`]
-///  - [DragonFly BSD `setsockopt`]
-///  - [DragonFly BSD `ip6`]
-///  - [illumos `setsockopt`]
-///  - [illumos `ip6`]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `netinet/in.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_in.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `ipv6`]: https://man7.org/linux/man-pages/man7/ipv6.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `IPPROTO_IPV6` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `ip6`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/ip6.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `ip6`]: https://man.freebsd.org/cgi/man.cgi?query=ip6&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `ip6`]: https://man.netbsd.org/ip6.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `ip6`]: https://man.openbsd.org/ip6.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `ip6`]: https://man.dragonflybsd.org/?command=ip6&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `ip6`]: https://illumos.org/man/4P/ip6
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
 #[inline]
 #[doc(alias = "IPV6_LEAVE_GROUP")]
 #[doc(alias = "IPV6_DROP_MEMBERSHIP")]
@@ -1670,361 +914,462 @@ pub fn set_ipv6_drop_membership<Fd: AsFd>(
     multiaddr: &Ipv6Addr,
     interface: u32,
 ) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_ipv6_drop_membership(fd.as_fd(), multiaddr, interface)
+    backend::net::sockopt::set_ipv6_drop_membership(fd.as_fd(), multiaddr, interface)
 }
 
-/// `setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, nodelay)`
+/// `setsockopt(fd, IPPROTO_IP, IP_TOS, value)`
 ///
-/// # References
-///  - [POSIX `setsockopt`]
-///  - [POSIX `netinet/tcp.h`]
-///  - [Linux `setsockopt`]
-///  - [Linux `tcp`]
-///  - [Winsock2 `setsockopt`]
-///  - [Winsock2 `IPPROTO_TCP` options]
-///  - [Apple `setsockopt`]
-///  - [Apple `tcp`]
-///  - [FreeBSD `setsockopt`]
-///  - [FreeBSD `tcp`]
-///  - [NetBSD `setsockopt`]
-///  - [NetBSD `tcp`]
-///  - [OpenBSD `setsockopt`]
-///  - [OpenBSD `tcp`]
-///  - [DragonFly BSD `setsockopt`]
-///  - [DragonFly BSD `tcp`]
-///  - [illumos `setsockopt`]
-///  - [illumos `tcp`]
-///
-/// [POSIX `setsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/setsockopt.html
-/// [POSIX `netinet/tcp.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
-/// [Linux `setsockopt`]: https://man7.org/linux/man-pages/man2/setsockopt.2.html
-/// [Linux `tcp`]: https://man7.org/linux/man-pages/man7/tcp.7.html
-/// [Winsock2 `setsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-setsockopt
-/// [Winsock2 `IPPROTO_TCP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options
-/// [Apple `setsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/setsockopt.2.html
-/// [Apple `tcp`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/tcp.4.auto.html
-/// [FreeBSD `setsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=setsockopt&sektion=2
-/// [FreeBSD `tcp`]: https://man.freebsd.org/cgi/man.cgi?query=tcp&sektion=4
-/// [NetBSD `setsockopt`]: https://man.netbsd.org/setsockopt.2
-/// [NetBSD `tcp`]: https://man.netbsd.org/tcp.4
-/// [OpenBSD `setsockopt`]: https://man.openbsd.org/setsockopt.2
-/// [OpenBSD `tcp`]: https://man.openbsd.org/tcp.4
-/// [DragonFly BSD `setsockopt`]: https://man.dragonflybsd.org/?command=setsockopt&section=2
-/// [DragonFly BSD `tcp`]: https://man.dragonflybsd.org/?command=tcp&section=4
-/// [illumos `setsockopt`]: https://illumos.org/man/3SOCKET/setsockopt
-/// [illumos `tcp`]: https://illumos.org/man/4P/tcp
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "haiku",
+    target_os = "nto",
+    target_env = "newlib"
+))]
+#[inline]
+#[doc(alias = "IP_TOS")]
+pub fn set_ip_tos<Fd: AsFd>(fd: Fd, value: u8) -> io::Result<()> {
+    backend::net::sockopt::set_ip_tos(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IP, IP_TOS)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "haiku",
+    target_os = "nto",
+    target_env = "newlib"
+))]
+#[inline]
+#[doc(alias = "IP_TOS")]
+pub fn get_ip_tos<Fd: AsFd>(fd: Fd) -> io::Result<u8> {
+    backend::net::sockopt::get_ip_tos(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_RECVTOS, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(apple, linux_like, target_os = "freebsd", target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "IP_RECVTOS")]
+pub fn set_ip_recvtos<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ip_recvtos(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IP, IP_RECVTOS)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ip_-and-set_ip_-functions
+#[cfg(any(apple, linux_like, target_os = "freebsd", target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "IP_RECVTOS")]
+pub fn get_ip_recvtos<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_ip_recvtos(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_RECVTCLASS, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "nto"
+))]
+#[inline]
+#[doc(alias = "IPV6_RECVTCLASS")]
+pub fn set_ipv6_recvtclass<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_recvtclass(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IPV6_RECVTCLASS)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(
+    bsd,
+    linux_like,
+    target_os = "aix",
+    target_os = "fuchsia",
+    target_os = "nto"
+))]
+#[inline]
+#[doc(alias = "IPV6_RECVTCLASS")]
+pub fn get_ipv6_recvtclass<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_ipv6_recvtclass(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IP, IP_FREEBIND, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "IP_FREEBIND")]
+pub fn set_ip_freebind<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ip_freebind(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IP, IP_FREEBIND)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "IP_FREEBIND")]
+pub fn get_ip_freebind<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_ip_freebind(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_FREEBIND, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "IPV6_FREEBIND")]
+pub fn set_ipv6_freebind<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_freebind(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IPV6_FREEBIND)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "IPV6_FREEBIND")]
+pub fn get_ipv6_freebind<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_ipv6_freebind(fd.as_fd())
+}
+
+/// `getsockopt(fd, IPPROTO_IP, SO_ORIGINAL_DST)`
+///
+/// Even though this corresponnds to a `SO_*` constant, it is an `IPPROTO_IP`
+/// option.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(any(linux_kernel, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "SO_ORIGINAL_DST")]
+pub fn get_ip_original_dst<Fd: AsFd>(fd: Fd) -> io::Result<SocketAddrV4> {
+    backend::net::sockopt::get_ip_original_dst(fd.as_fd())
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IP6T_SO_ORIGINAL_DST)`
+///
+/// Even though this corresponnds to a `IP6T_*` constant, it is an
+/// `IPPROTO_IPV6` option.
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(linux_kernel)]
+#[inline]
+#[doc(alias = "IP6T_SO_ORIGINAL_DST")]
+pub fn get_ipv6_original_dst<Fd: AsFd>(fd: Fd) -> io::Result<SocketAddrV6> {
+    backend::net::sockopt::get_ipv6_original_dst(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(not(any(
+    solarish,
+    windows,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "vita"
+)))]
+#[inline]
+#[doc(alias = "IPV6_TCLASS")]
+pub fn set_ipv6_tclass<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_ipv6_tclass(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_ipv6_-and-set_ipv6_-functions
+#[cfg(not(any(
+    solarish,
+    windows,
+    target_os = "espidf",
+    target_os = "haiku",
+    target_os = "vita"
+)))]
+#[inline]
+#[doc(alias = "IPV6_TCLASS")]
+pub fn get_ipv6_tclass<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    backend::net::sockopt::get_ipv6_tclass(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
 #[inline]
 #[doc(alias = "TCP_NODELAY")]
-pub fn set_tcp_nodelay<Fd: AsFd>(fd: Fd, nodelay: bool) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_tcp_nodelay(fd.as_fd(), nodelay)
+pub fn set_tcp_nodelay<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_nodelay(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, IPPROTO_TCP, TCP_NODELAY)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/tcp.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `tcp`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_TCP` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `tcp`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `tcp`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `tcp`]
-///  - [OpenBSD `getsockopt`]
-///  - [OpenBSD `tcp`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `tcp`]
-///  - [illumos `getsockopt`]
-///  - [illumos `tcp`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/tcp.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `tcp`]: https://man7.org/linux/man-pages/man7/tcp.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_TCP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options
-/// [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [Apple `tcp`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/tcp.4.auto.html
-/// [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [FreeBSD `tcp`]: https://man.freebsd.org/cgi/man.cgi?query=tcp&sektion=4
-/// [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
-/// [NetBSD `tcp`]: https://man.netbsd.org/tcp.4
-/// [OpenBSD `getsockopt`]: https://man.openbsd.org/getsockopt.2
-/// [OpenBSD `tcp`]: https://man.openbsd.org/tcp.4
-/// [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [DragonFly BSD `tcp`]: https://man.dragonflybsd.org/?command=tcp&section=4
-/// [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
-/// [illumos `tcp`]: https://illumos.org/man/4P/tcp
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
 #[inline]
 #[doc(alias = "TCP_NODELAY")]
 pub fn get_tcp_nodelay<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
-    backend::net::syscalls::sockopt::get_tcp_nodelay(fd.as_fd())
+    backend::net::sockopt::get_tcp_nodelay(fd.as_fd())
 }
 
-/// `setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, count)`
+/// `setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, value)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/tcp.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `tcp`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_TCP` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `tcp`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `tcp`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `tcp`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `tcp`]
-///  - [illumos `getsockopt`]
-///  - [illumos `tcp`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/tcp.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `tcp`]: https://man7.org/linux/man-pages/man7/tcp.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_TCP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options
-/// [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [Apple `tcp`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/tcp.4.auto.html
-/// [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [FreeBSD `tcp`]: https://man.freebsd.org/cgi/man.cgi?query=tcp&sektion=4
-/// [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
-/// [NetBSD `tcp`]: https://man.netbsd.org/tcp.4
-/// [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [DragonFly BSD `tcp`]: https://man.dragonflybsd.org/?command=tcp&section=4
-/// [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
-/// [illumos `tcp`]: https://illumos.org/man/4P/tcp
-#[inline]
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
 #[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+#[inline]
 #[doc(alias = "TCP_KEEPCNT")]
-pub fn set_tcp_keepcnt<Fd: AsFd>(fd: Fd, count: u32) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_tcp_keepcnt(fd.as_fd(), count)
+pub fn set_tcp_keepcnt<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_keepcnt(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/tcp.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `tcp`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_TCP` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `tcp`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `tcp`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `tcp`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `tcp`]
-///  - [illumos `getsockopt`]
-///  - [illumos `tcp`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/tcp.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `tcp`]: https://man7.org/linux/man-pages/man7/tcp.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_TCP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options
-/// [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [Apple `tcp`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/tcp.4.auto.html
-/// [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [FreeBSD `tcp`]: https://man.freebsd.org/cgi/man.cgi?query=tcp&sektion=4
-/// [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
-/// [NetBSD `tcp`]: https://man.netbsd.org/tcp.4
-/// [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [DragonFly BSD `tcp`]: https://man.dragonflybsd.org/?command=tcp&section=4
-/// [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
-/// [illumos `tcp`]: https://illumos.org/man/4P/tcp
-#[inline]
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
 #[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+#[inline]
 #[doc(alias = "TCP_KEEPCNT")]
 pub fn get_tcp_keepcnt<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
-    backend::net::syscalls::sockopt::get_tcp_keepcnt(fd.as_fd())
+    backend::net::sockopt::get_tcp_keepcnt(fd.as_fd())
 }
 
-/// `setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, duration)`
+/// `setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, value)`
 ///
 /// `TCP_KEEPALIVE` on Apple platforms.
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/tcp.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `tcp`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_TCP` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `tcp`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `tcp`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `tcp`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `tcp`]
-///  - [illumos `getsockopt`]
-///  - [illumos `tcp`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/tcp.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `tcp`]: https://man7.org/linux/man-pages/man7/tcp.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_TCP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options
-/// [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [Apple `tcp`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/tcp.4.auto.html
-/// [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [FreeBSD `tcp`]: https://man.freebsd.org/cgi/man.cgi?query=tcp&sektion=4
-/// [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
-/// [NetBSD `tcp`]: https://man.netbsd.org/tcp.4
-/// [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [DragonFly BSD `tcp`]: https://man.dragonflybsd.org/?command=tcp&section=4
-/// [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
-/// [illumos `tcp`]: https://illumos.org/man/4P/tcp
-#[inline]
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
 #[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+#[inline]
 #[doc(alias = "TCP_KEEPIDLE")]
-pub fn set_tcp_keepidle<Fd: AsFd>(fd: Fd, duration: Duration) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_tcp_keepidle(fd.as_fd(), duration)
+pub fn set_tcp_keepidle<Fd: AsFd>(fd: Fd, value: Duration) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_keepidle(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE)`
 ///
 /// `TCP_KEEPALIVE` on Apple platforms.
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/tcp.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `tcp`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_TCP` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `tcp`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `tcp`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `tcp`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `tcp`]
-///  - [illumos `getsockopt`]
-///  - [illumos `tcp`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/tcp.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `tcp`]: https://man7.org/linux/man-pages/man7/tcp.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_TCP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options
-/// [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [Apple `tcp`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/tcp.4.auto.html
-/// [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [FreeBSD `tcp`]: https://man.freebsd.org/cgi/man.cgi?query=tcp&sektion=4
-/// [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
-/// [NetBSD `tcp`]: https://man.netbsd.org/tcp.4
-/// [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [DragonFly BSD `tcp`]: https://man.dragonflybsd.org/?command=tcp&section=4
-/// [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
-/// [illumos `tcp`]: https://illumos.org/man/4P/tcp
-#[inline]
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
 #[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+#[inline]
 #[doc(alias = "TCP_KEEPIDLE")]
 pub fn get_tcp_keepidle<Fd: AsFd>(fd: Fd) -> io::Result<Duration> {
-    backend::net::syscalls::sockopt::get_tcp_keepidle(fd.as_fd())
+    backend::net::sockopt::get_tcp_keepidle(fd.as_fd())
 }
 
-/// `setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, duration)`
+/// `setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, value)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/tcp.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `tcp`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_TCP` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `tcp`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `tcp`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `tcp`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `tcp`]
-///  - [illumos `getsockopt`]
-///  - [illumos `tcp`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/tcp.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `tcp`]: https://man7.org/linux/man-pages/man7/tcp.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_TCP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options
-/// [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [Apple `tcp`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/tcp.4.auto.html
-/// [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [FreeBSD `tcp`]: https://man.freebsd.org/cgi/man.cgi?query=tcp&sektion=4
-/// [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
-/// [NetBSD `tcp`]: https://man.netbsd.org/tcp.4
-/// [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [DragonFly BSD `tcp`]: https://man.dragonflybsd.org/?command=tcp&section=4
-/// [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
-/// [illumos `tcp`]: https://illumos.org/man/4P/tcp
-#[inline]
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
 #[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+#[inline]
 #[doc(alias = "TCP_KEEPINTVL")]
-pub fn set_tcp_keepintvl<Fd: AsFd>(fd: Fd, duration: Duration) -> io::Result<()> {
-    backend::net::syscalls::sockopt::set_tcp_keepintvl(fd.as_fd(), duration)
+pub fn set_tcp_keepintvl<Fd: AsFd>(fd: Fd, value: Duration) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_keepintvl(fd.as_fd(), value)
 }
 
 /// `getsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL)`
 ///
-/// # References
-///  - [POSIX `getsockopt`]
-///  - [POSIX `netinet/tcp.h`]
-///  - [Linux `getsockopt`]
-///  - [Linux `tcp`]
-///  - [Winsock2 `getsockopt`]
-///  - [Winsock2 `IPPROTO_TCP` options]
-///  - [Apple `getsockopt`]
-///  - [Apple `tcp`]
-///  - [FreeBSD `getsockopt`]
-///  - [FreeBSD `tcp`]
-///  - [NetBSD `getsockopt`]
-///  - [NetBSD `tcp`]
-///  - [DragonFly BSD `getsockopt`]
-///  - [DragonFly BSD `tcp`]
-///  - [illumos `getsockopt`]
-///  - [illumos `tcp`]
-///
-/// [POSIX `getsockopt`]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html
-/// [POSIX `netinet/tcp.h`]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/netinet_tcp.h.html
-/// [Linux `getsockopt`]: https://man7.org/linux/man-pages/man2/getsockopt.2.html
-/// [Linux `tcp`]: https://man7.org/linux/man-pages/man7/tcp.7.html
-/// [Winsock2 `getsockopt`]: https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-getsockopt
-/// [Winsock2 `IPPROTO_TCP` options]: https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-tcp-socket-options
-/// [Apple `getsockopt`]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/getsockopt.2.html
-/// [Apple `tcp`]: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man4/tcp.4.auto.html
-/// [FreeBSD `getsockopt`]: https://man.freebsd.org/cgi/man.cgi?query=getsockopt&sektion=2
-/// [FreeBSD `tcp`]: https://man.freebsd.org/cgi/man.cgi?query=tcp&sektion=4
-/// [NetBSD `getsockopt`]: https://man.netbsd.org/getsockopt.2
-/// [NetBSD `tcp`]: https://man.netbsd.org/tcp.4
-/// [DragonFly BSD `getsockopt`]: https://man.dragonflybsd.org/?command=getsockopt&section=2
-/// [DragonFly BSD `tcp`]: https://man.dragonflybsd.org/?command=tcp&section=4
-/// [illumos `getsockopt`]: https://illumos.org/man/3SOCKET/getsockopt
-/// [illumos `tcp`]: https://illumos.org/man/4P/tcp
-#[inline]
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
 #[cfg(not(any(target_os = "openbsd", target_os = "haiku", target_os = "nto")))]
+#[inline]
 #[doc(alias = "TCP_KEEPINTVL")]
 pub fn get_tcp_keepintvl<Fd: AsFd>(fd: Fd) -> io::Result<Duration> {
-    backend::net::syscalls::sockopt::get_tcp_keepintvl(fd.as_fd())
+    backend::net::sockopt::get_tcp_keepintvl(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_USER_TIMEOUT, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_USER_TIMEOUT")]
+pub fn set_tcp_user_timeout<Fd: AsFd>(fd: Fd, value: u32) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_user_timeout(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_USER_TIMEOUT)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_USER_TIMEOUT")]
+pub fn get_tcp_user_timeout<Fd: AsFd>(fd: Fd) -> io::Result<u32> {
+    backend::net::sockopt::get_tcp_user_timeout(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_QUICKACK, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_QUICKACK")]
+pub fn set_tcp_quickack<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_quickack(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_QUICKACK)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_QUICKACK")]
+pub fn get_tcp_quickack<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_tcp_quickack(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_CONGESTION, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+#[inline]
+#[doc(alias = "TCP_CONGESTION")]
+pub fn set_tcp_congestion<Fd: AsFd>(fd: Fd, value: &str) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_congestion(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_CONGESTION)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(feature = "alloc")]
+#[cfg(any(
+    linux_like,
+    target_os = "freebsd",
+    target_os = "fuchsia",
+    target_os = "illumos"
+))]
+#[inline]
+#[doc(alias = "TCP_CONGESTION")]
+pub fn get_tcp_congestion<Fd: AsFd>(fd: Fd) -> io::Result<String> {
+    backend::net::sockopt::get_tcp_congestion(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_THIN_LINEAR_TIMEOUTS, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_THIN_LINEAR_TIMEOUTS")]
+pub fn set_tcp_thin_linear_timeouts<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_thin_linear_timeouts(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_THIN_LINEAR_TIMEOUTS)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_THIN_LINEAR_TIMEOUTS")]
+pub fn get_tcp_thin_linear_timeouts<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_tcp_thin_linear_timeouts(fd.as_fd())
+}
+
+/// `setsockopt(fd, IPPROTO_TCP, TCP_CORK, value)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, solarish, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_CORK")]
+pub fn set_tcp_cork<Fd: AsFd>(fd: Fd, value: bool) -> io::Result<()> {
+    backend::net::sockopt::set_tcp_cork(fd.as_fd(), value)
+}
+
+/// `getsockopt(fd, IPPROTO_TCP, TCP_CORK)`
+///
+/// See the [module-level documentation] for more.
+///
+/// [module-level documentation]: self#references-for-get_tcp_-and-set_tcp_-functions
+#[cfg(any(linux_like, solarish, target_os = "fuchsia"))]
+#[inline]
+#[doc(alias = "TCP_CORK")]
+pub fn get_tcp_cork<Fd: AsFd>(fd: Fd) -> io::Result<bool> {
+    backend::net::sockopt::get_tcp_cork(fd.as_fd())
+}
+
+/// Get credentials of Unix domain socket peer process
+///
+/// # References
+///  - [Linux `unix`]
+///
+/// [Linux `unix`]: https://man7.org/linux/man-pages/man7/unix.7.html
+#[cfg(linux_kernel)]
+#[doc(alias = "SO_PEERCRED")]
+pub fn get_socket_peercred<Fd: AsFd>(fd: Fd) -> io::Result<super::UCred> {
+    backend::net::sockopt::get_socket_peercred(fd.as_fd())
 }
 
 #[test]
diff --git a/vendor/rustix/src/net/types.rs b/vendor/rustix/src/net/types.rs
index 53116f9c8..711174354 100644
--- a/vendor/rustix/src/net/types.rs
+++ b/vendor/rustix/src/net/types.rs
@@ -92,6 +92,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const NETLINK: Self = Self(c::AF_NETLINK as _);
     /// `AF_UNIX`, aka `AF_LOCAL`
@@ -106,16 +107,18 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const AX25: Self = Self(c::AF_AX25 as _);
     /// `AF_IPX`
     #[cfg(not(any(
-        target_os = "espidf",
         target_os = "aix",
+        target_os = "espidf",
+        target_os = "vita",
     )))]
     pub const IPX: Self = Self(c::AF_IPX as _);
     /// `AF_APPLETALK`
-    #[cfg(not(target_os = "espidf"))]
+    #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
     pub const APPLETALK: Self = Self(c::AF_APPLETALK as _);
     /// `AF_NETROM`
     #[cfg(not(any(
@@ -126,6 +129,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const NETROM: Self = Self(c::AF_NETROM as _);
     /// `AF_BRIDGE`
@@ -137,6 +141,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const BRIDGE: Self = Self(c::AF_BRIDGE as _);
     /// `AF_ATMPVC`
@@ -148,6 +153,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const ATMPVC: Self = Self(c::AF_ATMPVC as _);
     /// `AF_X25`
@@ -158,6 +164,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const X25: Self = Self(c::AF_X25 as _);
     /// `AF_ROSE`
@@ -169,10 +176,11 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const ROSE: Self = Self(c::AF_ROSE as _);
     /// `AF_DECnet`
-    #[cfg(not(any(target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(target_os = "espidf", target_os = "haiku", target_os = "vita")))]
     pub const DECnet: Self = Self(c::AF_DECnet as _);
     /// `AF_NETBEUI`
     #[cfg(not(any(
@@ -183,6 +191,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const NETBEUI: Self = Self(c::AF_NETBEUI as _);
     /// `AF_SECURITY`
@@ -194,6 +203,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const SECURITY: Self = Self(c::AF_SECURITY as _);
     /// `AF_KEY`
@@ -204,6 +214,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const KEY: Self = Self(c::AF_KEY as _);
     /// `AF_PACKET`
@@ -219,6 +230,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const PACKET: Self = Self(c::AF_PACKET as _);
     /// `AF_ASH`
@@ -230,6 +242,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const ASH: Self = Self(c::AF_ASH as _);
     /// `AF_ECONET`
@@ -241,6 +254,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const ECONET: Self = Self(c::AF_ECONET as _);
     /// `AF_ATMSVC`
@@ -252,6 +266,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const ATMSVC: Self = Self(c::AF_ATMSVC as _);
     /// `AF_RDS`
@@ -263,10 +278,11 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const RDS: Self = Self(c::AF_RDS as _);
     /// `AF_SNA`
-    #[cfg(not(any(target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(target_os = "espidf", target_os = "haiku", target_os = "vita")))]
     pub const SNA: Self = Self(c::AF_SNA as _);
     /// `AF_IRDA`
     #[cfg(not(any(
@@ -276,6 +292,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const IRDA: Self = Self(c::AF_IRDA as _);
     /// `AF_PPPOX`
@@ -287,6 +304,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const PPPOX: Self = Self(c::AF_PPPOX as _);
     /// `AF_WANPIPE`
@@ -298,6 +316,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const WANPIPE: Self = Self(c::AF_WANPIPE as _);
     /// `AF_LLC`
@@ -309,6 +328,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const LLC: Self = Self(c::AF_LLC as _);
     /// `AF_CAN`
@@ -320,6 +340,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const CAN: Self = Self(c::AF_CAN as _);
     /// `AF_TIPC`
@@ -331,6 +352,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const TIPC: Self = Self(c::AF_TIPC as _);
     /// `AF_BLUETOOTH`
@@ -340,6 +362,7 @@ impl AddressFamily {
         windows,
         target_os = "aix",
         target_os = "espidf",
+        target_os = "vita",
     )))]
     pub const BLUETOOTH: Self = Self(c::AF_BLUETOOTH as _);
     /// `AF_IUCV`
@@ -351,6 +374,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const IUCV: Self = Self(c::AF_IUCV as _);
     /// `AF_RXRPC`
@@ -362,6 +386,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const RXRPC: Self = Self(c::AF_RXRPC as _);
     /// `AF_ISDN`
@@ -371,6 +396,7 @@ impl AddressFamily {
         target_os = "aix",
         target_os = "espidf",
         target_os = "haiku",
+        target_os = "vita",
     )))]
     pub const ISDN: Self = Self(c::AF_ISDN as _);
     /// `AF_PHONET`
@@ -382,6 +408,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const PHONET: Self = Self(c::AF_PHONET as _);
     /// `AF_IEEE802154`
@@ -393,6 +420,7 @@ impl AddressFamily {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const IEEE802154: Self = Self(c::AF_IEEE802154 as _);
     /// `AF_802`
@@ -610,26 +638,58 @@ pub mod ipproto {
     /// `IPPROTO_ICMP`
     pub const ICMP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_ICMP as _));
     /// `IPPROTO_IGMP`
-    #[cfg(not(any(solarish, target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const IGMP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_IGMP as _));
     /// `IPPROTO_IPIP`
-    #[cfg(not(any(solarish, windows, target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const IPIP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_IPIP as _));
     /// `IPPROTO_TCP`
     pub const TCP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_TCP as _));
     /// `IPPROTO_EGP`
-    #[cfg(not(any(solarish, target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const EGP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_EGP as _));
     /// `IPPROTO_PUP`
-    #[cfg(not(any(solarish, target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const PUP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_PUP as _));
     /// `IPPROTO_UDP`
     pub const UDP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_UDP as _));
     /// `IPPROTO_IDP`
-    #[cfg(not(any(solarish, target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const IDP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_IDP as _));
     /// `IPPROTO_TP`
-    #[cfg(not(any(solarish, windows, target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const TP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_TP as _));
     /// `IPPROTO_DCCP`
     #[cfg(not(any(
@@ -642,21 +702,44 @@ pub mod ipproto {
         target_os = "haiku",
         target_os = "nto",
         target_os = "openbsd",
+        target_os = "vita",
     )))]
     pub const DCCP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_DCCP as _));
     /// `IPPROTO_IPV6`
     pub const IPV6: Protocol = Protocol(new_raw_protocol(c::IPPROTO_IPV6 as _));
     /// `IPPROTO_RSVP`
-    #[cfg(not(any(solarish, windows, target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const RSVP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_RSVP as _));
     /// `IPPROTO_GRE`
-    #[cfg(not(any(solarish, windows, target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        windows,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const GRE: Protocol = Protocol(new_raw_protocol(c::IPPROTO_GRE as _));
     /// `IPPROTO_ESP`
-    #[cfg(not(any(solarish, target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const ESP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_ESP as _));
     /// `IPPROTO_AH`
-    #[cfg(not(any(solarish, target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const AH: Protocol = Protocol(new_raw_protocol(c::IPPROTO_AH as _));
     /// `IPPROTO_MTP`
     #[cfg(not(any(
@@ -667,6 +750,7 @@ pub mod ipproto {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const MTP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_MTP as _));
     /// `IPPROTO_BEETPH`
@@ -677,7 +761,8 @@ pub mod ipproto {
         target_os = "aix",
         target_os = "espidf",
         target_os = "haiku",
-        target_os = "nto"
+        target_os = "nto",
+        target_os = "vita",
     )))]
     pub const BEETPH: Protocol = Protocol(new_raw_protocol(c::IPPROTO_BEETPH as _));
     /// `IPPROTO_ENCAP`
@@ -687,10 +772,17 @@ pub mod ipproto {
         target_os = "aix",
         target_os = "espidf",
         target_os = "haiku",
+        target_os = "vita",
     )))]
     pub const ENCAP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_ENCAP as _));
     /// `IPPROTO_PIM`
-    #[cfg(not(any(solarish, target_os = "aix", target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        target_os = "aix",
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const PIM: Protocol = Protocol(new_raw_protocol(c::IPPROTO_PIM as _));
     /// `IPPROTO_COMP`
     #[cfg(not(any(
@@ -700,7 +792,8 @@ pub mod ipproto {
         target_os = "aix",
         target_os = "espidf",
         target_os = "haiku",
-        target_os = "nto"
+        target_os = "nto",
+        target_os = "vita",
     )))]
     pub const COMP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_COMP as _));
     /// `IPPROTO_SCTP`
@@ -709,7 +802,8 @@ pub mod ipproto {
         target_os = "dragonfly",
         target_os = "espidf",
         target_os = "haiku",
-        target_os = "openbsd"
+        target_os = "openbsd",
+        target_os = "vita",
     )))]
     pub const SCTP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_SCTP as _));
     /// `IPPROTO_UDPLITE`
@@ -723,6 +817,7 @@ pub mod ipproto {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const UDPLITE: Protocol = Protocol(new_raw_protocol(c::IPPROTO_UDPLITE as _));
     /// `IPPROTO_MPLS`
@@ -736,13 +831,14 @@ pub mod ipproto {
         target_os = "haiku",
         target_os = "netbsd",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const MPLS: Protocol = Protocol(new_raw_protocol(c::IPPROTO_MPLS as _));
     /// `IPPROTO_ETHERNET`
     #[cfg(linux_kernel)]
     pub const ETHERNET: Protocol = Protocol(new_raw_protocol(c::IPPROTO_ETHERNET as _));
     /// `IPPROTO_RAW`
-    #[cfg(not(target_os = "espidf"))]
+    #[cfg(not(any(target_os = "espidf", target_os = "vita")))]
     pub const RAW: Protocol = Protocol(new_raw_protocol(c::IPPROTO_RAW as _));
     /// `IPPROTO_MPTCP`
     #[cfg(not(any(
@@ -755,10 +851,16 @@ pub mod ipproto {
         target_os = "fuchsia",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const MPTCP: Protocol = Protocol(new_raw_protocol(c::IPPROTO_MPTCP as _));
     /// `IPPROTO_FRAGMENT`
-    #[cfg(not(any(solarish, target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const FRAGMENT: Protocol = Protocol(new_raw_protocol(c::IPPROTO_FRAGMENT as _));
     /// `IPPROTO_ICMPV6`
     pub const ICMPV6: Protocol = Protocol(new_raw_protocol(c::IPPROTO_ICMPV6 as _));
@@ -772,10 +874,16 @@ pub mod ipproto {
         target_os = "espidf",
         target_os = "haiku",
         target_os = "nto",
+        target_os = "vita",
     )))]
     pub const MH: Protocol = Protocol(new_raw_protocol(c::IPPROTO_MH as _));
     /// `IPPROTO_ROUTING`
-    #[cfg(not(any(solarish, target_os = "espidf", target_os = "haiku")))]
+    #[cfg(not(any(
+        solarish,
+        target_os = "espidf",
+        target_os = "haiku",
+        target_os = "vita"
+    )))]
     pub const ROUTING: Protocol = Protocol(new_raw_protocol(c::IPPROTO_ROUTING as _));
 }
 
@@ -1323,6 +1431,7 @@ bitflags! {
             target_os = "espidf",
             target_os = "haiku",
             target_os = "nto",
+            target_os = "vita",
         )))]
         const NONBLOCK = bitcast!(c::SOCK_NONBLOCK);
 
@@ -1336,6 +1445,25 @@ bitflags! {
     }
 }
 
+/// UNIX credentials of socket peer, for use with [`get_socket_peercred`]
+/// [`SendAncillaryMessage::ScmCredentials`] and
+/// [`RecvAncillaryMessage::ScmCredentials`].
+///
+/// [`get_socket_peercred`]: crate::net::sockopt::get_socket_peercred
+/// [`SendAncillaryMessage::ScmCredentials`]: crate::net::SendAncillaryMessage::ScmCredentials
+/// [`RecvAncillaryMessage::ScmCredentials`]: crate::net::RecvAncillaryMessage::ScmCredentials
+#[cfg(linux_kernel)]
+#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
+#[repr(C)]
+pub struct UCred {
+    /// Process ID of peer
+    pub pid: crate::pid::Pid,
+    /// User ID of peer
+    pub uid: crate::ugid::Uid,
+    /// Group ID of peer
+    pub gid: crate::ugid::Gid,
+}
+
 #[test]
 fn test_sizes() {
     use c::c_int;
@@ -1361,4 +1489,7 @@ fn test_sizes() {
         let t: Option<Protocol> = Some(Protocol::from_raw(RawProtocol::new(4567).unwrap()));
         assert_eq!(4567_u32, transmute::<Option<Protocol>, u32>(t));
     }
+
+    #[cfg(linux_kernel)]
+    assert_eq_size!(UCred, libc::ucred);
 }