コード例 #1
0
ファイル: policy.go プロジェクト: ttaanngg/gobgp
// compare extended community in the message's attribute with
// the one in the condition.
func (c *ExtCommunityCondition) evaluate(path *table.Path) bool {
	makeAs4Str := func(ec *ExtCommunityElement) string {
		t := ec.ecType
		str := fmt.Sprintf("%d", ec.localAdmin)
		switch t {
		case bgp.EC_TYPE_TRANSITIVE_TWO_OCTET_AS_SPECIFIC:
			str = fmt.Sprintf("%d:%s", ec.globalAdmin.(uint16), str)
		case bgp.EC_TYPE_TRANSITIVE_IP4_SPECIFIC:
			str = fmt.Sprintf("%s:%s", ec.globalAdmin.(net.IP).String(), str)
		case bgp.EC_TYPE_TRANSITIVE_FOUR_OCTET_AS_SPECIFIC:
			ga := ec.globalAdmin.(uint32)
			upper := strconv.FormatUint(uint64(ga&0xFFFF0000>>16), 10)
			lower := strconv.FormatUint(uint64(ga&0x0000FFFF), 10)
			str = fmt.Sprintf("%s.%s:%s", upper, lower, str)
		}
		return str
	}

	makeTypeSubStr := func(st bgp.ExtendedCommunityAttrSubType) string {
		subStr := ""
		switch st {
		case bgp.EC_SUBTYPE_ROUTE_TARGET:
			subStr = "RT"
		case bgp.EC_SUBTYPE_ROUTE_ORIGIN:
			subStr = "SoO"
		}
		return subStr
	}
	eCommunities := path.GetExtCommunities()
	if len(eCommunities) == 0 || c == nil {
		return false
	}

	matched := false
	matchStr := ""
	for _, member := range c.ExtCommunityList {
		for _, eCommunity := range eCommunities {
			ec := eCommunity.(bgp.ExtendedCommunityInterface)
			t, st := ec.GetTypes()
			if member.isRegExp {
				ecString := fmt.Sprintf("%s:%s", makeTypeSubStr(st), ec.String())
				if member.regExp.MatchString(ecString) {
					matched = true
					log.WithFields(log.Fields{
						"Topic":  "Policy",
						"RegExp": member.regExp.String(),
					}).Debug("extended community regexp used")
					matchStr = ec.String()
					break
				}
			} else if member.ecType == t && member.ecSubType == st {
				if makeAs4Str(member) == ec.String() {
					matched = true
					matchStr = ec.String()
					break
				}

			}
		}
		if matched {
			log.WithFields(log.Fields{
				"Topic":              "Policy",
				"Condition":          "Extended Community",
				"Extended Community": matchStr,
			}).Debug("condition matched")

			return true
		}
	}
	return false
}