policy: support an action to add origin-validation ext-community

you can implement

https://tools.ietf.org/html/draft-kklf-sidr-route-server-rpki-light-00

by following commands

$ gobgp policy statement st0 add condition rpki valid
$ gobgp policy statement st0 add action ext-community add valid
$ gobgp policy statement st1 add condition rpki not-found
$ gobgp policy statement st1 add action ext-community add not-found
$ gobgp policy statement st2 add condition rpki invalid
$ gobgp policy statement st2 add action ext-community add invalid
$ gobgp policy p0 add st0 st1 st2
$ gobgp policy p0
Name p0:
    StatementName st0:
        Conditions:
            RPKI result: valid
        Actions:
            ExtCommunity:   COMMUNITY_ADD[valid]
            NONE
    StatementName st1:
        Conditions:
            RPKI result: not-found
        Actions:
            ExtCommunity:   COMMUNITY_ADD[not-found]
            NONE
    StatementName st2:
        Conditions:
            RPKI result: invalid
        Actions:
            ExtCommunity:   COMMUNITY_ADD[invalid]
            NONE

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

1 files changed, 19 insertions, 0 deletions

diff --git a/packet/bgp.go b/packet/bgp.go
index 1d7b65cc..d47e3b65 100644
--- a/packet/bgp.go
+++ b/packet/bgp.go
@@ -4559,6 +4559,25 @@ func NewFourOctetAsSpecificExtended(subtype ExtendedCommunityAttrSubType, as uin
 }
 
 func ParseExtendedCommunity(subtype ExtendedCommunityAttrSubType, com string) (ExtendedCommunityInterface, error) {
+	if subtype == EC_SUBTYPE_ORIGIN_VALIDATION {
+		var value ValidationState
+		switch com {
+		case VALIDATION_STATE_VALID.String():
+			value = VALIDATION_STATE_VALID
+		case VALIDATION_STATE_NOT_FOUND.String():
+			value = VALIDATION_STATE_NOT_FOUND
+		case VALIDATION_STATE_INVALID.String():
+			value = VALIDATION_STATE_INVALID
+		default:
+			return nil, fmt.Errorf("invalid validation state")
+		}
+		return &OpaqueExtended{
+			SubType: EC_SUBTYPE_ORIGIN_VALIDATION,
+			Value: &ValidationExtended{
+				Value: value,
+			},
+		}, nil
+	}
 	elems, err := parseRdAndRt(com)
 	if err != nil {
 		return nil, err