This patch is based on a revert of upstream commit 
71cc9ab4c27db1ec2412d7f0bc86bcae7ebf1d74 adapted for use in the debian package
by Peter Michael Green.

Index: tokio/src/net/tcp/socket.rs
===================================================================
--- tokio.orig/src/net/tcp/socket.rs
+++ tokio/src/net/tcp/socket.rs
@@ -450,7 +450,7 @@ impl TcpSocket {
     /// # }
     /// ```
     pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
-        self.inner.set_tcp_nodelay(nodelay)
+        self.inner.set_nodelay(nodelay)
     }
 
     /// Gets the value of the `TCP_NODELAY` option on this socket.
@@ -472,7 +472,7 @@ impl TcpSocket {
     /// # }
     /// ```
     pub fn nodelay(&self) -> io::Result<bool> {
-        self.inner.tcp_nodelay()
+        self.inner.nodelay()
     }
 
     /// Gets the value of the `IP_TOS` option for this socket.
@@ -502,7 +502,7 @@ impl TcpSocket {
         ))))
     )]
     pub fn tos(&self) -> io::Result<u32> {
-        self.inner.tos_v4()
+        self.inner.tos()
     }
 
     /// Sets the value for the `IP_TOS` option on this socket.
@@ -531,7 +531,7 @@ impl TcpSocket {
         ))))
     )]
     pub fn set_tos(&self, tos: u32) -> io::Result<()> {
-        self.inner.set_tos_v4(tos)
+        self.inner.set_tos(tos)
     }
 
     /// Gets the value for the `SO_BINDTODEVICE` option on this socket
Index: tokio/src/net/udp.rs
===================================================================
--- tokio.orig/src/net/udp.rs
+++ tokio/src/net/udp.rs
@@ -2028,7 +2028,7 @@ impl UdpSocket {
         ))))
     )]
     pub fn tos(&self) -> io::Result<u32> {
-        self.as_socket().tos_v4()
+        self.as_socket().tos()
     }
 
     /// Sets the value for the `IP_TOS` option on this socket.
@@ -2057,7 +2057,7 @@ impl UdpSocket {
         ))))
     )]
     pub fn set_tos(&self, tos: u32) -> io::Result<()> {
-        self.as_socket().set_tos_v4(tos)
+        self.as_socket().set_tos(tos)
     }
 
     /// Gets the value for the `SO_BINDTODEVICE` option on this socket
Index: tokio/Cargo.toml
===================================================================
--- tokio.orig/Cargo.toml
+++ tokio/Cargo.toml
@@ -796,7 +796,7 @@ version = "0.4.9"
 version = "0.9"
 
 [target.'cfg(not(target_family = "wasm"))'.dependencies.socket2]
-version = "0.6.0"
+version = "0.5.5"
 features = ["all"]
 optional = true
 
@@ -804,7 +804,7 @@ optional = true
 version = "1"
 
 [target.'cfg(not(target_family = "wasm"))'.dev-dependencies.socket2]
-version = "0.6.0"
+version = "0.5.5"
 
 [target.'cfg(not(target_family = "wasm"))'.dev-dependencies.tempfile]
 version = "3.1.0"