add LocalPathIdentifier

add-path support needs two identifiers, remote (rx) and local
(tx). The remote identifiers are assigined by remote peers, the local
ones are assigned by gobgpd itself.

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

1 files changed, 13 insertions, 2 deletions

diff --git a/packet/bgp/bgp.go b/packet/bgp/bgp.go
index a07cd5e5..f7d39a30 100644
--- a/packet/bgp/bgp.go
+++ b/packet/bgp/bgp.go
@@ -994,10 +994,13 @@ type AddrPrefixInterface interface {
 	Flat() map[string]string
 	PathIdentifier() uint32
 	SetPathIdentifier(uint32)
+	PathLocalIdentifier() uint32
+	SetPathLocalIdentifier(uint32)
 }
 
 type PrefixDefault struct {
-	id uint32
+	id      uint32
+	localId uint32
 }
 
 func (p *PrefixDefault) PathIdentifier() uint32 {
@@ -1008,6 +1011,14 @@ func (p *PrefixDefault) SetPathIdentifier(id uint32) {
 	p.id = id
 }
 
+func (p *PrefixDefault) PathLocalIdentifier() uint32 {
+	return p.localId
+}
+
+func (p *PrefixDefault) SetPathLocalIdentifier(id uint32) {
+	p.localId = id
+}
+
 func (p *PrefixDefault) decodePathIdentifier(data []byte) ([]byte, error) {
 	if len(data) < 4 {
 		code := uint8(BGP_ERROR_UPDATE_MESSAGE_ERROR)
@@ -1020,7 +1031,7 @@ func (p *PrefixDefault) decodePathIdentifier(data []byte) ([]byte, error) {
 
 func (p *PrefixDefault) serializeIdentifier() ([]byte, error) {
 	buf := make([]byte, 4)
-	binary.BigEndian.PutUint32(buf, p.PathIdentifier())
+	binary.BigEndian.PutUint32(buf, p.PathLocalIdentifier())
 	return buf, nil
 }