Linux has defined IPV6_HDRINCL that is a different number than IP_HDRINCL. This patch adds a configuration that alters the value to set in set_header_included_v6()

Author: kntyskw

src/socket.rs

@@ -1674,6 +1674,9 @@ impl Socket {
             setsockopt(
                 self.as_raw(),
                 sys::IPPROTO_IPV6,
+                #[cfg(target_os = "linux")]
+                sys::IPV6_HDRINCL,
+                #[cfg(not(target_os = "linux"))]
                 sys::IP_HDRINCL,
                 included as c_int,
             )

src/sys/unix.rs

@@ -157,6 +157,8 @@ pub(crate) use libc::IPV6_RECVHOPLIMIT;
 pub(crate) use libc::IPV6_RECVTCLASS;
 #[cfg(all(feature = "all", not(any(target_os = "redox", target_os = "espidf"))))]
 pub(crate) use libc::IP_HDRINCL;
+#[cfg(all(feature = "all", target_os = "linux"))]
+pub(crate) use libc::IPV6_HDRINCL;
 #[cfg(not(any(
     target_os = "aix",
     target_os = "dragonfly",