Index: erbium-net/Cargo.toml
===================================================================
--- erbium-net.orig/Cargo.toml
+++ erbium-net/Cargo.toml
@@ -44,8 +44,8 @@ version = "0.8"
 features = ["tokio_socket"]
 
 [dependencies.nix]
-version = "0.26"
-features = ["net"]
+version = "0.27"
+features = ["net", "uio", "fs"]
 
 [dependencies.tokio]
 version = "1.8.4"
Index: erbium-net/src/raw.rs
===================================================================
--- erbium-net.orig/src/raw.rs
+++ erbium-net/src/raw.rs
@@ -21,6 +21,8 @@ use nix::sys::socket;
 use std::io;
 use std::os::unix::io::AsRawFd;
 use std::os::unix::io::RawFd;
+use std::os::fd::BorrowedFd;
+use std::os::fd::AsFd;
 use tokio::io::unix::AsyncFd;
 
 use crate::{addr::NetAddr, udp};
@@ -74,6 +76,12 @@ impl AsRawFd for RawSocket {
     }
 }
 
+impl AsFd for RawSocket {
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        unsafe { BorrowedFd::borrow_raw(self.fd.as_raw_fd()) }
+    }
+}
+
 impl RawSocket {
     pub fn new(protocol: EthProto) -> Result<Self> {
         Ok(Self {
@@ -113,7 +121,7 @@ impl RawSocket {
         opt: O,
         val: &O::Val,
     ) -> Result<()> {
-        nix::sys::socket::setsockopt(self.as_raw_fd(), opt, val).map_err(|e| e.into())
+        nix::sys::socket::setsockopt(self, opt, val).map_err(|e| e.into())
     }
 }
 
@@ -128,6 +136,12 @@ impl AsRawFd for CookedRawSocket {
     }
 }
 
+impl AsFd for CookedRawSocket {
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        unsafe { BorrowedFd::borrow_raw(self.fd.as_raw_fd()) }
+    }
+}
+
 impl CookedRawSocket {
     pub fn new(protocol: EthProto) -> Result<Self> {
         Ok(Self {
@@ -167,7 +181,7 @@ impl CookedRawSocket {
         opt: O,
         val: &O::Val,
     ) -> Result<()> {
-        nix::sys::socket::setsockopt(self.as_raw_fd(), opt, val).map_err(|e| e.into())
+        nix::sys::socket::setsockopt(self, opt, val).map_err(|e| e.into())
     }
 }
 
@@ -182,6 +196,12 @@ impl AsRawFd for Raw6Socket {
     }
 }
 
+impl AsFd for Raw6Socket {
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        unsafe { BorrowedFd::borrow_raw(self.fd.as_raw_fd()) }
+    }
+}
+
 impl Raw6Socket {
     pub fn new(protocol: IpProto) -> Result<Self> {
         Ok(Self {
@@ -221,7 +241,7 @@ impl Raw6Socket {
         opt: O,
         val: &O::Val,
     ) -> Result<()> {
-        nix::sys::socket::setsockopt(self.as_raw_fd(), opt, val).map_err(|e| e.into())
+        nix::sys::socket::setsockopt(self, opt, val).map_err(|e| e.into())
     }
 }
 
@@ -236,6 +256,13 @@ impl AsRawFd for Raw4Socket {
     }
 }
 
+impl AsFd for Raw4Socket {
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        unsafe { BorrowedFd::borrow_raw(self.fd.as_raw_fd()) }
+    }
+}
+
+
 impl Raw4Socket {
     pub fn new(protocol: IpProto) -> Result<Self> {
         Ok(Self {
@@ -275,6 +302,6 @@ impl Raw4Socket {
         opt: O,
         val: &O::Val,
     ) -> Result<()> {
-        nix::sys::socket::setsockopt(fd, opt, val).map_err(|e| e.into())
+        nix::sys::socket::setsockopt(unsafe { &BorrowedFd::borrow_raw(fd) }, opt, val).map_err(|e| e.into())
     }
 }
Index: erbium-net/src/udp.rs
===================================================================
--- erbium-net.orig/src/udp.rs
+++ erbium-net/src/udp.rs
@@ -28,6 +28,7 @@ use std::convert::TryFrom;
 use std::io;
 use std::net;
 use std::os::unix::io::AsRawFd as _;
+use std::os::fd::BorrowedFd;
 use tokio::io::unix::AsyncFd;
 
 use nix::libc;
@@ -104,7 +105,7 @@ impl UdpSocket {
 
     pub fn set_opt_ipv4_packet_info(&self, b: bool) -> Result<(), io::Error> {
         nix::sys::socket::setsockopt(
-            self.fd.get_ref().as_raw_fd(),
+            unsafe { &BorrowedFd::borrow_raw(self.fd.get_ref().as_raw_fd()) },
             nix::sys::socket::sockopt::Ipv4PacketInfo,
             &b,
         )
@@ -113,7 +114,7 @@ impl UdpSocket {
 
     pub fn set_opt_ipv6_packet_info(&self, b: bool) -> Result<(), io::Error> {
         nix::sys::socket::setsockopt(
-            self.fd.get_ref().as_raw_fd(),
+            unsafe { &BorrowedFd::borrow_raw(self.fd.get_ref().as_raw_fd()) },
             nix::sys::socket::sockopt::Ipv6RecvPacketInfo,
             &b,
         )
@@ -122,7 +123,7 @@ impl UdpSocket {
 
     pub fn set_opt_reuse_port(&self, b: bool) -> Result<(), io::Error> {
         nix::sys::socket::setsockopt(
-            self.fd.get_ref().as_raw_fd(),
+            unsafe { &BorrowedFd::borrow_raw(self.fd.get_ref().as_raw_fd()) },
             nix::sys::socket::sockopt::ReusePort,
             &b,
         )