Function UpdatePathAttrs

internal/pkg/table/path.go:233–352

(logger *slog.Logger, global *oc.Global, info *PeerInfo, original *Path)

}

func UpdatePathAttrs(logger *slog.Logger, global *oc.Global, info *PeerInfo, original *Path) *Path {
	if info.RouteServerClient {
		return original
	}
	path := original.Clone(original.IsWithdraw)

	for _, a := range path.GetPathAttrs() {
		if _, y := bgp.PathAttrFlags[a.GetType()]; !y {
			if a.GetFlags()&bgp.BGP_ATTR_FLAG_TRANSITIVE == 0 {
				path.delPathAttr(a.GetType())
			}
		} else {
			switch a.GetType() {
			case bgp.BGP_ATTR_TYPE_CLUSTER_LIST, bgp.BGP_ATTR_TYPE_ORIGINATOR_ID:
				if info.PeerType != oc.PEER_TYPE_INTERNAL || !info.RouteReflectorClient {
					// send these attributes to only rr clients
					path.delPathAttr(a.GetType())
				}
			}
		}
	}

	localAddress := info.LocalAddress
	nexthop := path.GetNexthop()
	switch info.PeerType {
	case oc.PEER_TYPE_EXTERNAL:
		// NEXTHOP handling
		if !path.IsLocal() || nexthop.IsUnspecified() {
			path.SetNexthop(localAddress)
		}

		// remove-private-as handling
		path.RemovePrivateAS(info.LocalAS, info.RemovePrivateAs)

		// AS_PATH handling
		confed := global.IsConfederationMember(info.AS)
		path.PrependAsn(info.LocalAS, 1, confed)
		if !confed {
			path.removeConfedAs()
		}

		// MED Handling
		if med := path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC); med != nil && !path.IsLocal() {
			path.delPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
		}
	case oc.PEER_TYPE_INTERNAL:
		// NEXTHOP handling for iBGP
		// if the path generated locally set local address as nexthop.
		// if not, don't modify it.
		// TODO: NEXT-HOP-SELF support
		if path.IsLocal() && nexthop.IsUnspecified() {
			path.SetNexthop(localAddress)
		}

		// AS_PATH handling for iBGP
		// if the path has AS_PATH path attribute, don't modify it.
		// if not, attach *empty* AS_PATH path attribute.
		if nh := path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH); nh == nil {