Ipv6 incl hop limit

src/socket.rs

@@ -2018,6 +2018,39 @@ impl Socket {
             )
         }
     }
+
+    /// Set the value of the `IPV6_RECVHOPLIMIT` option for this socket.
+    ///
+    /// The received hop limit is returned as ancillary data by recvmsg()
+    /// only if the application has enabled the IPV6_RECVHOPLIMIT socket
+    /// option:
+    #[cfg(all(
+        feature = "all",
+        not(any(
+            windows,
+            target_os = "dragonfly",
+            target_os = "fuchsia",
+            target_os = "illumos",
+            target_os = "netbsd",
+            target_os = "openbsd",
+            target_os = "redox",
+            target_os = "solaris",
+            target_os = "haiku",
+            target_os = "hurd",
+            target_os = "espidf",
+            target_os = "vita",
+        ))
+    ))]
+    pub fn set_recv_hoplimit_v6(&self, recv_hoplimit: bool) -> io::Result<()> {
+        unsafe {
+            setsockopt(
+                self.as_raw(),
+                sys::IPPROTO_IPV6,
+                sys::IPV6_RECVHOPLIMIT,
+                recv_hoplimit as c_int,
+            )
+        }
+    }
 }
 
 /// Socket options for TCP sockets, get/set using `IPPROTO_TCP`.

src/sys/unix.rs

@@ -122,6 +122,23 @@ pub(crate) use libc::SO_OOBINLINE;
 // Used in `Socket`.
 #[cfg(not(target_os = "nto"))]
 pub(crate) use libc::ipv6_mreq as Ipv6Mreq;
+#[cfg(all(
+    feature = "all",
+    not(any(
+        target_os = "dragonfly",
+        target_os = "fuchsia",
+        target_os = "hurd",
+        target_os = "illumos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "redox",
+        target_os = "solaris",
+        target_os = "haiku",
+        target_os = "espidf",
+        target_os = "vita",
+    ))
+))]
+pub(crate) use libc::IPV6_RECVHOPLIMIT;
 #[cfg(not(any(
     target_os = "dragonfly",
     target_os = "fuchsia",