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link: Add FlowBased support to Gretun

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GRE L3 devices support "FlowBased" ("collect_md"/"external") mode.
Add support for this configuration and relevant test.

Signed-off-by: Eyal Birger <eyal.birger@gmail.com>
This commit is contained in:
Eyal Birger 2022-08-02 10:32:16 +03:00 committed by Alessandro Boch
parent d0aef2fdcd
commit 7e7feb220f
3 changed files with 23 additions and 0 deletions

1
link.go
View File

@ -1166,6 +1166,7 @@ type Gretun struct {
EncapFlags uint16
EncapSport uint16
EncapDport uint16
FlowBased bool
}
func (gretun *Gretun) Attrs() *LinkAttrs {

8
link_linux.go
View File

@ -2797,6 +2797,12 @@ func parseGretapData(link Link, data []syscall.NetlinkRouteAttr) {
func addGretunAttrs(gre *Gretun, linkInfo *nl.RtAttr) {
data := linkInfo.AddRtAttr(nl.IFLA_INFO_DATA, nil)
if gre.FlowBased {
// In flow based mode, no other attributes need to be configured
data.AddRtAttr(nl.IFLA_GRE_COLLECT_METADATA, []byte{})
return
}
if ip := gre.Local; ip != nil {
if ip.To4() != nil {
ip = ip.To4()
@ -2867,6 +2873,8 @@ func parseGretunData(link Link, data []syscall.NetlinkRouteAttr) {
gre.EncapSport = ntohs(datum.Value[0:2])
case nl.IFLA_GRE_ENCAP_DPORT:
gre.EncapDport = ntohs(datum.Value[0:2])
case nl.IFLA_GRE_COLLECT_METADATA:
gre.FlowBased = true
}
}
}

14
link_test.go
View File

@ -455,6 +455,9 @@ func compareGretun(t *testing.T, expected, actual *Gretun) {
if actual.EncapDport != expected.EncapDport {
t.Fatal("Gretun.EncapDport doesn't match")
}
if actual.FlowBased != expected.FlowBased {
t.Fatal("Gretun.FlowBased doesn't match")
}
}
func compareVxlan(t *testing.T, expected, actual *Vxlan) {
@ -742,6 +745,17 @@ func TestLinkAddDelGretunPointToMultiPoint(t *testing.T) {
OKey: 7890})
}
func TestLinkAddDelGretunFlowBased(t *testing.T) {
minKernelRequired(t, 4, 3)
tearDown := setUpNetlinkTest(t)
defer tearDown()
testLinkAddDel(t, &Gretun{
LinkAttrs: LinkAttrs{Name: "foo"},
FlowBased: true})
}
func TestLinkAddDelGretapFlowBased(t *testing.T) {
minKernelRequired(t, 4, 3)