예제 #1
0
파일: policy.go 프로젝트: ttaanngg/gobgp
func (a *AsPathPrependAction) apply(path *table.Path) *table.Path {

	var asn uint32
	if a.useLeftMost {
		asns := path.GetAsSeqList()
		if len(asns) == 0 {
			log.WithFields(log.Fields{
				"Topic": "Policy",
				"Type":  "AsPathPrepend Action",
			}).Error("aspath length is zero.")
			return path
		}
		asn = asns[0]
		log.WithFields(log.Fields{
			"Topic":  "Policy",
			"Type":   "AsPathPrepend Action",
			"LastAs": asn,
			"Repeat": a.repeat,
		}).Debug("use last AS.")
	} else {
		asn = a.asn
	}

	path.PrependAsn(asn, a.repeat)
	return path
}
예제 #2
0
파일: policy.go 프로젝트: ttaanngg/gobgp
// compare AS_PATH in the message's AS_PATH attribute with
// the one in condition.
func (c *AsPathCondition) evaluate(path *table.Path) bool {

	aspath := path.GetAsSeqList()

	if len(aspath) == 0 {
		return false
	}

	matched := false
	for _, member := range c.AsPathList {

		switch member.postiion {
		case AS_FROM:
			matched = aspath[0] == member.asn
		case AS_ANY:
			for _, n := range aspath {
				if n == member.asn {
					matched = true
					break
				}
			}
		case AS_ORIGIN:
			matched = aspath[len(aspath)-1] == member.asn

		case AS_ONLY:
			matched = len(aspath) == 1 && aspath[0] == member.asn

		}

		if matched {
			log.WithFields(log.Fields{
				"Topic":     "Policy",
				"Condition": "aspath length",
				"ASN":       member.asn,
				"Position":  member.postiion,
			}).Debug("condition matched")
			return true
		}

	}
	return false
}