From f24382625b3d845c4e166f7cc04ca3d726c8a6b9 Mon Sep 17 00:00:00 2001
From: Tao Li <tao.li06@sap.com>
Date: Thu, 27 May 2021 16:43:04 +0200
Subject: [PATCH] add proto field to Iptun

---
 link.go       | 1 +
 link_linux.go | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/link.go b/link.go
index 82d0360..33c8723 100644
--- a/link.go
+++ b/link.go
@@ -1038,6 +1038,7 @@ type Iptun struct {
 	EncapType  uint16
 	EncapFlags uint16
 	FlowBased  bool
+	Proto      uint8
 }
 
 func (iptun *Iptun) Attrs() *LinkAttrs {
diff --git a/link_linux.go b/link_linux.go
index aa998e3..ffad73d 100644
--- a/link_linux.go
+++ b/link_linux.go
@@ -2874,6 +2874,7 @@ func addIptunAttrs(iptun *Iptun, linkInfo *nl.RtAttr) {
 	data.AddRtAttr(nl.IFLA_IPTUN_ENCAP_FLAGS, nl.Uint16Attr(iptun.EncapFlags))
 	data.AddRtAttr(nl.IFLA_IPTUN_ENCAP_SPORT, htons(iptun.EncapSport))
 	data.AddRtAttr(nl.IFLA_IPTUN_ENCAP_DPORT, htons(iptun.EncapDport))
+	data.AddRtAttr(nl.IFLA_IPTUN_PROTO, nl.Uint8Attr(iptun.Proto))
 }
 
 func parseIptunData(link Link, data []syscall.NetlinkRouteAttr) {
@@ -2904,6 +2905,8 @@ func parseIptunData(link Link, data []syscall.NetlinkRouteAttr) {
 			iptun.EncapFlags = native.Uint16(datum.Value[0:2])
 		case nl.IFLA_IPTUN_COLLECT_METADATA:
 			iptun.FlowBased = true
+		case nl.IFLA_IPTUN_PROTO:
+			iptun.Proto = datum.Value[0]
 		}
 	}
 }