From 9c020396d3b610731e5a34916a715bd922864555 Mon Sep 17 00:00:00 2001
From: Kenta Yasukawa <kenta@soracom.io>
Date: Wed, 12 Mar 2025 11:54:01 -0400
Subject: [PATCH] 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()

---
 src/socket.rs   | 3 +++
 src/sys/unix.rs | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/src/socket.rs b/src/socket.rs
index 1bed96f5..7f2a1edf 100644
--- a/src/socket.rs
+++ b/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,
             )
diff --git a/src/sys/unix.rs b/src/sys/unix.rs
index 37d0c3a6..8e24f4e5 100644
--- a/src/sys/unix.rs
+++ b/src/sys/unix.rs
@@ -124,6 +124,8 @@ 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", target_os = "linux"))]
+pub(crate) use libc::IPV6_HDRINCL;
 #[cfg(all(
     feature = "all",
     not(any(