packet: improve PathAttributeCommunities JSON output

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

1 files changed, 26 insertions, 2 deletions

diff --git a/packet/bgp.go b/packet/bgp.go
index 6369269e..9928ecce 100644
--- a/packet/bgp.go
+++ b/packet/bgp.go
@@ -1567,12 +1567,36 @@ func (p *PathAttributeCommunities) Serialize() ([]byte, error) {
 }
 
 func (p *PathAttributeCommunities) MarshalJSON() ([]byte, error) {
+	wellKnown := map[uint32]string{
+		0xffff0000: "planned-shut",
+		0xffff0001: "accept-own",
+		0xffff0002: "ROUTE_FILTER_TRANSLATED_v4",
+		0xffff0003: "ROUTE_FILTER_v4",
+		0xffff0004: "ROUTE_FILTER_TRANSLATED_v6",
+		0xffff0005: "ROUTE_FILTER_v6",
+		0xffff0006: "LLGR_STALE",
+		0xffff0007: "NO_LLGR",
+		0xFFFFFF01: "NO_EXPORT",
+		0xFFFFFF02: "NO_ADVERTISE",
+		0xFFFFFF03: "NO_EXPORT_SUBCONFED",
+		0xFFFFFF04: "NOPEER"}
+
+	l := make([]string, len(p.Value))
+	for i, v := range p.Value {
+		s, found := wellKnown[v]
+		if found {
+			l[i] = s
+		} else {
+			l[i] = fmt.Sprintf("%x:%x", (v&0xffff0000)>>16, v&0xffff)
+		}
+	}
+
 	return json.Marshal(struct {
 		Type  string
-		Value []uint32
+		Value []string
 	}{
 		Type:  p.Type.String(),
-		Value: p.Value,
+		Value: l,
 	})
 }