From e4bb2dbd5557c9417b30cf9fcd9032fd6fea5366 Mon Sep 17 00:00:00 2001
From: Zxilly <31370133+Zxilly@users.noreply.github.com>
Date: Wed, 30 Apr 2025 10:30:35 +0800
Subject: [PATCH] fix parsing of interface index in packet info cmsg on big
 endian architectures (#5094)

---
 sys_conn_helper_darwin.go | 2 +-
 sys_conn_helper_linux.go  | 2 +-
 sys_conn_oob.go           | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/sys_conn_helper_darwin.go b/sys_conn_helper_darwin.go
index 545502dda..a04bfb3ce 100644
--- a/sys_conn_helper_darwin.go
+++ b/sys_conn_helper_darwin.go
@@ -30,7 +30,7 @@ func parseIPv4PktInfo(body []byte) (ip netip.Addr, ifIndex uint32, ok bool) {
 	if len(body) != 12 {
 		return netip.Addr{}, 0, false
 	}
-	return netip.AddrFrom4(*(*[4]byte)(body[8:12])), binary.LittleEndian.Uint32(body), true
+	return netip.AddrFrom4(*(*[4]byte)(body[8:12])), binary.NativeEndian.Uint32(body), true
 }
 
 func isGSOEnabled(syscall.RawConn) bool { return false }
diff --git a/sys_conn_helper_linux.go b/sys_conn_helper_linux.go
index eec127197..9a890cbe1 100644
--- a/sys_conn_helper_linux.go
+++ b/sys_conn_helper_linux.go
@@ -58,7 +58,7 @@ func parseIPv4PktInfo(body []byte) (ip netip.Addr, ifIndex uint32, ok bool) {
 	if len(body) != 12 {
 		return netip.Addr{}, 0, false
 	}
-	return netip.AddrFrom4(*(*[4]byte)(body[8:12])), binary.LittleEndian.Uint32(body), true
+	return netip.AddrFrom4(*(*[4]byte)(body[8:12])), binary.NativeEndian.Uint32(body), true
 }
 
 // isGSOEnabled tests if the kernel supports GSO.
diff --git a/sys_conn_oob.go b/sys_conn_oob.go
index 5ed1b656e..974ff0499 100644
--- a/sys_conn_oob.go
+++ b/sys_conn_oob.go
@@ -222,7 +222,7 @@ func (c *oobConn) ReadPacket() (receivedPacket, error) {
 				// };
 				if len(body) == 20 {
 					p.info.addr = netip.AddrFrom16(*(*[16]byte)(body[:16])).Unmap()
-					p.info.ifIndex = binary.LittleEndian.Uint32(body[16:])
+					p.info.ifIndex = binary.NativeEndian.Uint32(body[16:])
 				} else {
 					invalidCmsgOnceV6.Do(func() {
 						log.Printf("Received invalid IPv6 packet info control message: %+x. "+