Add support for ignore-df flag in gretap links

pinoOgni · vishvananda · commit 481da0d6a464 · 2025-09-04T12:31:30.000-07:00
Signed-off-by: Giuseppe Ognibene &lt;ognibenegiuseppe8@gmail.com&gt;
diff --git a/link.go b/link.go
@@ -1118,8 +1118,16 @@ type Gretap struct {
 	EncapFlags uint16
 	Link       uint32
 	FlowBased  bool
+	IgnoreDf   GretapIgnoreDf
 }
 
+type GretapIgnoreDf uint8
+
+const (
+	GRETAP_IGNORE_DF_FALSE = iota
+	GRETAP_IGNORE_DF_TRUE
+)
+
 func (gretap *Gretap) Attrs() *LinkAttrs {
 	return &gretap.LinkAttrs
 }
diff --git a/link_linux.go b/link_linux.go
@@ -3461,6 +3461,9 @@ func addGretapAttrs(gretap *Gretap, linkInfo *nl.RtAttr) {
 	data.AddRtAttr(nl.IFLA_GRE_ENCAP_FLAGS, nl.Uint16Attr(gretap.EncapFlags))
 	data.AddRtAttr(nl.IFLA_GRE_ENCAP_SPORT, htons(gretap.EncapSport))
 	data.AddRtAttr(nl.IFLA_GRE_ENCAP_DPORT, htons(gretap.EncapDport))
+	if gretap.IgnoreDf != GRETAP_IGNORE_DF_FALSE {
+		data.AddRtAttr(nl.IFLA_GRE_IGNORE_DF, nl.Uint8Attr(uint8(gretap.IgnoreDf)))
+	}
 }
 
 func parseGretapData(link Link, data []syscall.NetlinkRouteAttr) {
diff --git a/nl/link_linux.go b/nl/link_linux.go
@@ -274,6 +274,7 @@ const (
 	IFLA_GRE_ENCAP_SPORT
 	IFLA_GRE_ENCAP_DPORT
 	IFLA_GRE_COLLECT_METADATA
+	IFLA_GRE_IGNORE_DF
 	IFLA_GRE_MAX = IFLA_GRE_COLLECT_METADATA
 )
 

Original file line number	Diff line number	Diff line change
`@@ -3461,6 +3461,9 @@ func addGretapAttrs(gretap Gretap, linkInfo nl.RtAttr) {`
`3461`	`3461`	`data.AddRtAttr(nl.IFLA_GRE_ENCAP_FLAGS, nl.Uint16Attr(gretap.EncapFlags))`
`3462`	`3462`	`data.AddRtAttr(nl.IFLA_GRE_ENCAP_SPORT, htons(gretap.EncapSport))`
`3463`	`3463`	`data.AddRtAttr(nl.IFLA_GRE_ENCAP_DPORT, htons(gretap.EncapDport))`
	`3464`	`+ if gretap.IgnoreDf != GRETAP_IGNORE_DF_FALSE {`
	`3465`	`+ data.AddRtAttr(nl.IFLA_GRE_IGNORE_DF, nl.Uint8Attr(uint8(gretap.IgnoreDf)))`
	`3466`	`+ }`
`3464`	`3467`	`}`
`3465`	`3468`
`3466`	`3469`	`func parseGretapData(link Link, data []syscall.NetlinkRouteAttr) {`
Original file line number	Diff line number	Diff line change
`@@ -274,6 +274,7 @@ const (`
`274`	`274`	`IFLA_GRE_ENCAP_SPORT`
`275`	`275`	`IFLA_GRE_ENCAP_DPORT`
`276`	`276`	`IFLA_GRE_COLLECT_METADATA`
	`277`	`+ IFLA_GRE_IGNORE_DF`
`277`	`278`	`IFLA_GRE_MAX = IFLA_GRE_COLLECT_METADATA`
`278`	`279`	`)`
`279`	`280`