config: add mpls label range configuration

you can specify mpls label range from which gobgpd automatically assign to
vpn routes like below

```
[Global]
  As = 65000
  RouterId = "192.168.255.1"
  [Global.MplsLabelRange]
    MinLabel = 1000
    MaxLabel = 1999
```

default values (min:16000, max:1048575) is taken from cisco ios xr.

Signed-off-by: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>

3 files changed, 33 insertions, 0 deletions

diff --git a/config/bgp_configs.go b/config/bgp_configs.go
index cd8df79d..ae19a162 100644
--- a/config/bgp_configs.go
+++ b/config/bgp_configs.go
@@ -791,6 +791,14 @@ type Neighbors struct {
 	NeighborList []Neighbor
 }
 
+//struct for container gobgp:mpls-label-range
+type MplsLabelRange struct {
+	// original -> gobgp:min-label
+	MinLabel uint32
+	// original -> gobgp:max-label
+	MaxLabel uint32
+}
+
 //struct for container gobgp:zebra
 type Zebra struct {
 	// original -> gobgp:enabled
@@ -1346,6 +1354,8 @@ type Global struct {
 	Mrt Mrt
 	// original -> gobgp:zebra
 	Zebra Zebra
+	// original -> gobgp:mpls-label-range
+	MplsLabelRange MplsLabelRange
 }
 
 //struct for container bgp:bgp
diff --git a/config/default.go b/config/default.go
index d3160989..2170e0dd 100644
--- a/config/default.go
+++ b/config/default.go
@@ -10,6 +10,8 @@ const (
 	DEFAULT_HOLDTIME                  = 90
 	DEFAULT_IDLE_HOLDTIME_AFTER_RESET = 30
 	DEFAULT_CONNECT_RETRY             = 120
+	DEFAULT_MPLS_LABEL_MIN            = 16000
+	DEFAULT_MPLS_LABEL_MAX            = 1048575
 )
 
 type neighbor struct {
@@ -45,6 +47,14 @@ func SetDefaultConfigValues(md toml.MetaData, bt *Bgp) error {
 		}
 	}
 
+	if _, ok := global["Global.MplsLabelRange.MinLabel"]; !ok {
+		bt.Global.MplsLabelRange.MinLabel = DEFAULT_MPLS_LABEL_MIN
+	}
+
+	if _, ok := global["Global.MplsLabelRange.MaxLabel"]; !ok {
+		bt.Global.MplsLabelRange.MaxLabel = DEFAULT_MPLS_LABEL_MAX
+	}
+
 	nidx := 0
 	for _, key := range md.Keys() {
 		if !strings.HasPrefix(key.String(), "Neighbors.NeighborList") {
diff --git a/tools/pyang_plugins/gobgp.yang b/tools/pyang_plugins/gobgp.yang
index aff25752..c1107ea6 100644
--- a/tools/pyang_plugins/gobgp.yang
+++ b/tools/pyang_plugins/gobgp.yang
@@ -641,4 +641,17 @@ module bgp-gobgp {
       }
     }
   }
+
+  augment "/bgp:bgp/bgp:global" {
+    container mpls-label-range {
+      description "mpls labal range";
+
+      leaf min-label {
+          type uint32;
+      }
+      leaf max-label {
+          type uint32;
+      }
+    }
+  }
 }