// Copyright (C) 2014 Nippon Telegraph and Telephone Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package table
import (
"bytes"
"encoding/json"
"fmt"
"math"
"net"
"sort"
"time"
log "github.com/Sirupsen/logrus"
"github.com/osrg/gobgp/config"
"github.com/osrg/gobgp/packet/bgp"
"github.com/satori/go.uuid"
)
const (
DEFAULT_LOCAL_PREF = 100
)
type Bitmap []uint64
func (b Bitmap) Flag(i uint) {
b[i/64] |= 1 << uint(i%64)
}
func (b Bitmap) Unflag(i uint) {
b[i/64] &^= 1 << uint(i%64)
}
func (b Bitmap) GetFlag(i uint) bool {
return b[i/64]&(1<<uint(i%64)) > 0
}
func NewBitmap(size int) Bitmap {
return Bitmap(make([]uint64, (size+64-1)/64))
}
type originInfo struct {
nlri bgp.AddrPrefixInterface
source *PeerInfo
timestamp time.Time
noImplicitWithdraw bool
validation config.RpkiValidationResultType
isFromExternal bool
key string
uuid uuid.UUID
eor bool
stale bool
}
type FlowSpecComponents []bgp.FlowSpecComponentInterface
func (c FlowSpecComponents) Len() int {
return len(c)
}
func (c FlowSpecComponents) Swap(i, j int) {
c[i], c[j] = c[j], c[i]
}
func (c FlowSpecComponents) Less(i, j int) bool {
return c[i].Type() < c[j].Type()
}
type Path struct {
info *originInfo
IsWithdraw bool
pathAttrs []bgp.PathAttributeInterface
reason BestPathReason
parent *Path
dels []bgp.BGPAttrType
filtered map[string]PolicyDirection
VrfIds []uint16
// For BGP Nexthop Tracking, this field shows if nexthop is invalidated by IGP.
IsNexthopInvalid bool
}
func NewPath(source *PeerInfo, nlri bgp.AddrPrefixInterface, isWithdraw bool, pattrs []bgp.PathAttributeInterface, timestamp time.Time, noImplicitWithdraw bool) *Path {
if !isWithdraw && pattrs == nil {
log.WithFields(log.Fields{
"Topic": "Table",
"Key": nlri.String(),
}).Error("Need to provide patattrs for the path that is not withdraw.")
return nil
}
if nlri != nil && (nlri.SAFI() == bgp.SAFI_FLOW_SPEC_UNICAST || nlri.SAFI() == bgp.SAFI_FLOW_SPEC_VPN) {
var coms FlowSpecComponents
var f *bgp.FlowSpecNLRI
switch nlri.(type) {
case *bgp.FlowSpecIPv4Unicast:
f = &nlri.(*bgp.FlowSpecIPv4Unicast).FlowSpecNLRI
case *bgp.FlowSpecIPv4VPN:
f = &nlri.(*bgp.FlowSpecIPv4VPN).FlowSpecNLRI
case *bgp.FlowSpecIPv6Unicast:
f = &nlri.(*bgp.FlowSpecIPv6Unicast).FlowSpecNLRI
case *bgp.FlowSpecIPv6VPN:
f = &nlri.(*bgp.FlowSpecIPv6VPN).FlowSpecNLRI
}
if f != nil {
coms = f.Value
sort.Sort(coms)
}
}
return &Path{
info: &originInfo{
nlri: nlri,
source: source,
timestamp: timestamp,
noImplicitWithdraw: noImplicitWithdraw,
},
IsWithdraw: isWithdraw,
pathAttrs: pattrs,
filtered: make(map[string]PolicyDirection),
}
}
func NewEOR(family bgp.RouteFamily) *Path {
afi, safi := bgp.RouteFamilyToAfiSafi(family)
nlri, _ := bgp.NewPrefixFromRouteFamily(afi, safi)
return &Path{
info: &originInfo{
nlri: nlri,
eor: true,
},
filtered: make(map[string]PolicyDirection),
}
}
func (path *Path) IsEOR() bool {
if path.info != nil && path.info.eor {
return true
}
return false
}
func cloneAsPath(asAttr *bgp.PathAttributeAsPath) *bgp.PathAttributeAsPath {
newASparams := make([]bgp.AsPathParamInterface, len(asAttr.Value))
for i, param := range asAttr.Value {
asParam := param.(*bgp.As4PathParam)
as := make([]uint32, len(asParam.AS))
copy(as, asParam.AS)
newASparams[i] = bgp.NewAs4PathParam(asParam.Type, as)
}
return bgp.NewPathAttributeAsPath(newASparams)
}
func UpdatePathAttrs(global *config.Global, peer *config.Neighbor, info *PeerInfo, original *Path) *Path {
if peer.RouteServer.Config.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())
}
}
}
localAddress := info.LocalAddress
isZero := func(ip net.IP) bool {
return ip.Equal(net.ParseIP("0.0.0.0")) || ip.Equal(net.ParseIP("::"))
}
nexthop := path.GetNexthop()
if peer.State.PeerType == config.PEER_TYPE_EXTERNAL {
// NEXTHOP handling
if !path.IsLocal() || isZero(nexthop) {
path.SetNexthop(localAddress)
}
// AS_PATH handling
path.PrependAsn(peer.Config.LocalAs, 1)
// 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)
}
} else if peer.State.PeerType == config.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() && isZero(nexthop) {
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 {
path.PrependAsn(0, 0)
}
// For iBGP peers we are required to send local-pref attribute
// for connected or local prefixes.
// We set default local-pref 100.
if pref := path.getPathAttr(bgp.BGP_ATTR_TYPE_LOCAL_PREF); pref == nil || !path.IsLocal() {
path.setPathAttr(bgp.NewPathAttributeLocalPref(DEFAULT_LOCAL_PREF))
}
// RFC4456: BGP Route Reflection
// 8. Avoiding Routing Information Loops
info := path.GetSource()
if peer.RouteReflector.Config.RouteReflectorClient {
// This attribute will carry the BGP Identifier of the originator of the route in the local AS.
// A BGP speaker SHOULD NOT create an ORIGINATOR_ID attribute if one already exists.
//
// RFC4684 3.2 Intra-AS VPN Route Distribution
// When advertising RT membership NLRI to a route-reflector client,
// the Originator attribute shall be set to the router-id of the
// advertiser, and the Next-hop attribute shall be set of the local
// address for that session.
if path.GetRouteFamily() == bgp.RF_RTC_UC {
path.SetNexthop(localAddress)
path.setPathAttr(bgp.NewPathAttributeOriginatorId(info.LocalID.String()))
} else if path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGINATOR_ID) == nil {
path.setPathAttr(bgp.NewPathAttributeOriginatorId(info.ID.String()))
}
// When an RR reflects a route, it MUST prepend the local CLUSTER_ID to the CLUSTER_LIST.
// If the CLUSTER_LIST is empty, it MUST create a new one.
id := string(peer.RouteReflector.Config.RouteReflectorClusterId)
if p := path.getPathAttr(bgp.BGP_ATTR_TYPE_CLUSTER_LIST); p == nil {
path.setPathAttr(bgp.NewPathAttributeClusterList([]string{id}))
} else {
clusterList := p.(*bgp.PathAttributeClusterList)
newClusterList := make([]string, 0, len(clusterList.Value))
for _, ip := range clusterList.Value {
newClusterList = append(newClusterList, ip.String())
}
path.setPathAttr(bgp.NewPathAttributeClusterList(append([]string{id}, newClusterList...)))
}
}
} else {
log.WithFields(log.Fields{
"Topic": "Peer",
"Key": peer.Config.NeighborAddress,
}).Warnf("invalid peer type: %d", peer.State.PeerType)
}
return path
}
func (path *Path) GetTimestamp() time.Time {
return path.OriginInfo().timestamp
}
func (path *Path) setTimestamp(t time.Time) {
path.OriginInfo().timestamp = t
}
func (path *Path) IsLocal() bool {
return path.GetSource().Address == nil
}
func (path *Path) IsIBGP() bool {
return path.GetSource().AS == path.GetSource().LocalAS
}
// create new PathAttributes
func (path *Path) Clone(isWithdraw bool) *Path {
return &Path{
parent: path,
IsWithdraw: isWithdraw,
filtered: make(map[string]PolicyDirection),
IsNexthopInvalid: path.IsNexthopInvalid,
}
}
func (path *Path) root() *Path {
p := path
for p.parent != nil {
p = p.parent
}
return p
}
func (path *Path) OriginInfo() *originInfo {
return path.root().info
}
func (path *Path) NoImplicitWithdraw() bool {
return path.OriginInfo().noImplicitWithdraw
}
func (path *Path) Validation() config.RpkiValidationResultType {
return path.OriginInfo().validation
}
func (path *Path) SetValidation(r config.RpkiValidationResultType) {
path.OriginInfo().validation = r
}
func (path *Path) IsFromExternal() bool {
return path.OriginInfo().isFromExternal
}
func (path *Path) SetIsFromExternal(y bool) {
path.OriginInfo().isFromExternal = y
}
func (path *Path) UUID() uuid.UUID {
return path.OriginInfo().uuid
}
func (path *Path) SetUUID(id []byte) {
path.OriginInfo().uuid = uuid.FromBytesOrNil(id)
}
func (path *Path) AssignNewUUID() {
path.OriginInfo().uuid = uuid.NewV4()
}
func (path *Path) Filter(id string, reason PolicyDirection) {
path.filtered[id] = reason
}
func (path *Path) Filtered(id string) PolicyDirection {
return path.filtered[id]
}
func (path *Path) GetRouteFamily() bgp.RouteFamily {
return bgp.AfiSafiToRouteFamily(path.OriginInfo().nlri.AFI(), path.OriginInfo().nlri.SAFI())
}
func (path *Path) SetSource(source *PeerInfo) {
path.OriginInfo().source = source
}
func (path *Path) GetSource() *PeerInfo {
return path.OriginInfo().source
}
func (path *Path) MarkStale(s bool) {
path.OriginInfo().stale = s
}
func (path *Path) IsStale() bool {
return path.OriginInfo().stale
}
func (path *Path) IsLLGRStale() bool {
for _, c := range path.GetCommunities() {
if c == bgp.COMMUNITY_LLGR_STALE {
return true
}
}
return false
}
func (path *Path) GetSourceAs() uint32 {
attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
if attr != nil {
asPathParam := attr.(*bgp.PathAttributeAsPath).Value
if len(asPathParam) == 0 {
return 0
}
asPath := asPathParam[len(asPathParam)-1].(*bgp.As4PathParam)
if asPath.Num == 0 {
return 0
}
return asPath.AS[asPath.Num-1]
}
return 0
}
func (path *Path) GetNexthop() net.IP {
attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
if attr != nil {
return attr.(*bgp.PathAttributeNextHop).Value
}
attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
if attr != nil {
return attr.(*bgp.PathAttributeMpReachNLRI).Nexthop
}
return net.IP{}
}
func (path *Path) SetNexthop(nexthop net.IP) {
if path.GetRouteFamily() == bgp.RF_IPv4_UC && nexthop.To4() == nil {
path.delPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
mpreach := bgp.NewPathAttributeMpReachNLRI(nexthop.String(), []bgp.AddrPrefixInterface{path.GetNlri()})
path.setPathAttr(mpreach)
return
}
attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
if attr != nil {
path.setPathAttr(bgp.NewPathAttributeNextHop(nexthop.String()))
}
attr = path.getPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
if attr != nil {
oldNlri := attr.(*bgp.PathAttributeMpReachNLRI)
path.setPathAttr(bgp.NewPathAttributeMpReachNLRI(nexthop.String(), oldNlri.Value))
}
}
func (path *Path) GetNlri() bgp.AddrPrefixInterface {
return path.OriginInfo().nlri
}
type PathAttrs []bgp.PathAttributeInterface
func (a PathAttrs) Len() int {
return len(a)
}
func (a PathAttrs) Swap(i, j int) {
a[i], a[j] = a[j], a[i]
}
func (a PathAttrs) Less(i, j int) bool {
return a[i].GetType() < a[j].GetType()
}
func (path *Path) GetPathAttrs() []bgp.PathAttributeInterface {
deleted := NewBitmap(math.MaxUint8)
modified := make(map[uint]bgp.PathAttributeInterface)
p := path
for {
for _, t := range p.dels {
deleted.Flag(uint(t))
}
if p.parent == nil {
list := PathAttrs(make([]bgp.PathAttributeInterface, 0, len(p.pathAttrs)))
// we assume that the original pathAttrs are
// in order, that is, other bgp speakers send
// attributes in order.
for _, a := range p.pathAttrs {
typ := uint(a.GetType())
if m, ok := modified[typ]; ok {
list = append(list, m)
delete(modified, typ)
} else if !deleted.GetFlag(typ) {
list = append(list, a)
}
}
if len(modified) > 0 {
// Huh, some attributes were newly
// added. So we need to sort...
for _, m := range modified {
list = append(list, m)
}
sort.Sort(list)
}
return list
} else {
for _, a := range p.pathAttrs {
typ := uint(a.GetType())
if _, ok := modified[typ]; !deleted.GetFlag(typ) && !ok {
modified[typ] = a
}
}
}
p = p.parent
}
}
func (path *Path) getPathAttr(typ bgp.BGPAttrType) bgp.PathAttributeInterface {
p := path
for {
for _, t := range p.dels {
if t == typ {
return nil
}
}
for _, a := range p.pathAttrs {
if a.GetType() == typ {
return a
}
}
if p.parent == nil {
return nil
}
p = p.parent
}
}
func (path *Path) setPathAttr(a bgp.PathAttributeInterface) {
if len(path.pathAttrs) == 0 {
path.pathAttrs = []bgp.PathAttributeInterface{a}
} else {
for i, b := range path.pathAttrs {
if a.GetType() == b.GetType() {
path.pathAttrs[i] = a
return
}
}
path.pathAttrs = append(path.pathAttrs, a)
}
}
func (path *Path) delPathAttr(typ bgp.BGPAttrType) {
if len(path.dels) == 0 {
path.dels = []bgp.BGPAttrType{typ}
} else {
path.dels = append(path.dels, typ)
}
}
// return Path's string representation
func (path *Path) String() string {
s := bytes.NewBuffer(make([]byte, 0, 64))
if path.IsEOR() {
s.WriteString(fmt.Sprintf("{ %s EOR | src: %s }", path.GetRouteFamily(), path.GetSource()))
return s.String()
}
s.WriteString(fmt.Sprintf("{ %s | ", path.getPrefix()))
s.WriteString(fmt.Sprintf("src: %s", path.GetSource()))
s.WriteString(fmt.Sprintf(", nh: %s", path.GetNexthop()))
if path.IsNexthopInvalid {
s.WriteString(" (not reachable)")
}
if path.IsWithdraw {
s.WriteString(", withdraw")
}
s.WriteString(" }")
return s.String()
}
func (path *Path) getPrefix() string {
if path.OriginInfo().key == "" {
path.OriginInfo().key = path.GetNlri().String()
}
return path.OriginInfo().key
}
func (path *Path) GetAsPath() *bgp.PathAttributeAsPath {
attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_AS_PATH)
if attr != nil {
return attr.(*bgp.PathAttributeAsPath)
}
return nil
}
// GetAsPathLen returns the number of AS_PATH
func (path *Path) GetAsPathLen() int {
var length int = 0
if aspath := path.GetAsPath(); aspath != nil {
for _, as := range aspath.Value {
length += as.ASLen()
}
}
return length
}
func (path *Path) GetAsString() string {
s := bytes.NewBuffer(make([]byte, 0, 64))
if aspath := path.GetAsPath(); aspath != nil {
for i, paramIf := range aspath.Value {
segment := paramIf.(*bgp.As4PathParam)
if i != 0 {
s.WriteString(" ")
}
sep := " "
switch segment.Type {
case bgp.BGP_ASPATH_ATTR_TYPE_SET, bgp.BGP_ASPATH_ATTR_TYPE_CONFED_SET:
s.WriteString("{")
sep = ","
}
for j, as := range segment.AS {
s.WriteString(fmt.Sprintf("%d", as))
if j != len(segment.AS)-1 {
s.WriteString(sep)
}
}
switch segment.Type {
case bgp.BGP_ASPATH_ATTR_TYPE_SET, bgp.BGP_ASPATH_ATTR_TYPE_CONFED_SET:
s.WriteString("}")
}
}
}
return s.String()
}
func (path *Path) GetAsList() []uint32 {
return path.getAsListofSpecificType(true, true)
}
func (path *Path) GetAsSeqList() []uint32 {
return path.getAsListofSpecificType(true, false)
}
func (path *Path) getAsListofSpecificType(getAsSeq, getAsSet bool) []uint32 {
asList := []uint32{}
if aspath := path.GetAsPath(); aspath != nil {
for _, paramIf := range aspath.Value {
segment := paramIf.(*bgp.As4PathParam)
if getAsSeq && segment.Type == bgp.BGP_ASPATH_ATTR_TYPE_SEQ {
asList = append(asList, segment.AS...)
continue
}
if getAsSet && segment.Type == bgp.BGP_ASPATH_ATTR_TYPE_SET {
asList = append(asList, segment.AS...)
} else {
asList = append(asList, 0)
}
}
}
return asList
}
// PrependAsn prepends AS number.
// This function updates the AS_PATH attribute as follows.
// 1) if the first path segment of the AS_PATH is of type
// AS_SEQUENCE, the local system prepends the specified AS num as
// the last element of the sequence (put it in the left-most
// position with respect to the position of octets in the
// protocol message) the specified number of times.
// If the act of prepending will cause an overflow in the AS_PATH
// segment (i.e., more than 255 ASes),
// it SHOULD prepend a new segment of type AS_SEQUENCE
// and prepend its own AS number to this new segment.
//
// 2) if the first path segment of the AS_PATH is of other than type
// AS_SEQUENCE, the local system prepends a new path segment of type
// AS_SEQUENCE to the AS_PATH, including the specified AS number in
// that segment.
//
// 3) if the AS_PATH is empty, the local system creates a path
// segment of type AS_SEQUENCE, places the specified AS number
// into that segment, and places that segment into the AS_PATH.
func (path *Path) PrependAsn(asn uint32, repeat uint8) {
original := path.GetAsPath()
asns := make([]uint32, repeat)
for i, _ := range asns {
asns[i] = asn
}
var asPath *bgp.PathAttributeAsPath
if original == nil {
asPath = bgp.NewPathAttributeAsPath([]bgp.AsPathParamInterface{})
} else {
asPath = cloneAsPath(original)
}
if len(asPath.Value) > 0 {
fst := asPath.Value[0].(*bgp.As4PathParam)
if fst.Type == bgp.BGP_ASPATH_ATTR_TYPE_SEQ {
if len(fst.AS)+int(repeat) > 255 {
repeat = uint8(255 - len(fst.AS))
}
fst.AS = append(asns[:int(repeat)], fst.AS...)
fst.Num += repeat
asns = asns[int(repeat):]
}
}
if len(asns) > 0 {
p := bgp.NewAs4PathParam(bgp.BGP_ASPATH_ATTR_TYPE_SEQ, asns)
asPath.Value = append([]bgp.AsPathParamInterface{p}, asPath.Value...)
}
path.setPathAttr(asPath)
}
func (path *Path) GetCommunities() []uint32 {
communityList := []uint32{}
if attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_COMMUNITIES); attr != nil {
communities := attr.(*bgp.PathAttributeCommunities)
communityList = append(communityList, communities.Value...)
}
return communityList
}
// SetCommunities adds or replaces communities with new ones.
// If the length of communities is 0 and doReplace is true, it clears communities.
func (path *Path) SetCommunities(communities []uint32, doReplace bool) {
if len(communities) == 0 && doReplace {
// clear communities
path.delPathAttr(bgp.BGP_ATTR_TYPE_COMMUNITIES)
return
}
newList := make([]uint32, 0)
attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_COMMUNITIES)
if attr != nil {
c := attr.(*bgp.PathAttributeCommunities)
if doReplace {
newList = append(newList, communities...)
} else {
newList = append(newList, c.Value...)
newList = append(newList, communities...)
}
} else {
newList = append(newList, communities...)
}
path.setPathAttr(bgp.NewPathAttributeCommunities(newList))
}
// RemoveCommunities removes specific communities.
// If the length of communities is 0, it does nothing.
// If all communities are removed, it removes Communities path attribute itself.
func (path *Path) RemoveCommunities(communities []uint32) int {
if len(communities) == 0 {
// do nothing
return 0
}
find := func(val uint32) bool {
for _, com := range communities {
if com == val {
return true
}
}
return false
}
count := 0
attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_COMMUNITIES)
if attr != nil {
newList := make([]uint32, 0)
c := attr.(*bgp.PathAttributeCommunities)
for _, value := range c.Value {
if find(value) {
count += 1
} else {
newList = append(newList, value)
}
}
if len(newList) != 0 {
path.setPathAttr(bgp.NewPathAttributeCommunities(newList))
} else {
path.delPathAttr(bgp.BGP_ATTR_TYPE_COMMUNITIES)
}
}
return count
}
func (path *Path) GetExtCommunities() []bgp.ExtendedCommunityInterface {
eCommunityList := make([]bgp.ExtendedCommunityInterface, 0)
if attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_EXTENDED_COMMUNITIES); attr != nil {
eCommunities := attr.(*bgp.PathAttributeExtendedCommunities).Value
for _, eCommunity := range eCommunities {
eCommunityList = append(eCommunityList, eCommunity)
}
}
return eCommunityList
}
func (path *Path) SetExtCommunities(exts []bgp.ExtendedCommunityInterface, doReplace bool) {
attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_EXTENDED_COMMUNITIES)
if attr != nil {
l := attr.(*bgp.PathAttributeExtendedCommunities).Value
if doReplace {
l = exts
} else {
l = append(l, exts...)
}
path.setPathAttr(bgp.NewPathAttributeExtendedCommunities(l))
} else {
path.setPathAttr(bgp.NewPathAttributeExtendedCommunities(exts))
}
}
func (path *Path) GetLargeCommunities() []*bgp.LargeCommunity {
if a := path.getPathAttr(bgp.BGP_ATTR_TYPE_LARGE_COMMUNITY); a != nil {
v := a.(*bgp.PathAttributeLargeCommunities).Values
ret := make([]*bgp.LargeCommunity, 0, len(v))
for _, c := range v {
ret = append(ret, c)
}
return ret
}
return nil
}
func (path *Path) SetLargeCommunities(cs []*bgp.LargeCommunity, doReplace bool) {
a := path.getPathAttr(bgp.BGP_ATTR_TYPE_LARGE_COMMUNITY)
if a == nil || doReplace {
path.setPathAttr(bgp.NewPathAttributeLargeCommunities(cs))
} else {
l := a.(*bgp.PathAttributeLargeCommunities).Values
path.setPathAttr(bgp.NewPathAttributeLargeCommunities(append(l, cs...)))
}
}
func (path *Path) GetMed() (uint32, error) {
attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC)
if attr == nil {
return 0, fmt.Errorf("no med path attr")
}
return attr.(*bgp.PathAttributeMultiExitDisc).Value, nil
}
// SetMed replace, add or subtraction med with new ones.
func (path *Path) SetMed(med int64, doReplace bool) error {
parseMed := func(orgMed uint32, med int64, doReplace bool) (*bgp.PathAttributeMultiExitDisc, error) {
newMed := &bgp.PathAttributeMultiExitDisc{}
if doReplace {
newMed = bgp.NewPathAttributeMultiExitDisc(uint32(med))
} else {
if int64(orgMed)+med < 0 {
return nil, fmt.Errorf("med value invalid. it's underflow threshold.")
} else if int64(orgMed)+med > int64(math.MaxUint32) {
return nil, fmt.Errorf("med value invalid. it's overflow threshold.")
}
newMed = bgp.NewPathAttributeMultiExitDisc(uint32(int64(orgMed) + med))
}
return newMed, nil
}
m := uint32(0)
if attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_MULTI_EXIT_DISC); attr != nil {
m = attr.(*bgp.PathAttributeMultiExitDisc).Value
}
newMed, err := parseMed(m, med, doReplace)
if err != nil {
return err
}
path.setPathAttr(newMed)
return nil
}
func (path *Path) RemoveLocalPref() {
if path.getPathAttr(bgp.BGP_ATTR_TYPE_LOCAL_PREF) != nil {
path.delPathAttr(bgp.BGP_ATTR_TYPE_LOCAL_PREF)
}
}
func (path *Path) GetOriginatorID() net.IP {
if attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGINATOR_ID); attr != nil {
return attr.(*bgp.PathAttributeOriginatorId).Value
}
return nil
}
func (path *Path) GetClusterList() []net.IP {
if attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_CLUSTER_LIST); attr != nil {
return attr.(*bgp.PathAttributeClusterList).Value
}
return nil
}
func (path *Path) GetOrigin() (uint8, error) {
if attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_ORIGIN); attr != nil {
return attr.(*bgp.PathAttributeOrigin).Value[0], nil
}
return 0, fmt.Errorf("no origin path attr")
}
func (path *Path) GetLocalPref() (uint32, error) {
lp := uint32(DEFAULT_LOCAL_PREF)
attr := path.getPathAttr(bgp.BGP_ATTR_TYPE_LOCAL_PREF)
if attr != nil {
lp = attr.(*bgp.PathAttributeLocalPref).Value
}
return lp, nil
}
func (lhs *Path) Equal(rhs *Path) bool {
if rhs == nil {
return false
}
if lhs.GetSource() != rhs.GetSource() {
return false
}
pattrs := func(arg []bgp.PathAttributeInterface) []byte {
ret := make([]byte, 0)
for _, a := range arg {
aa, _ := a.Serialize()
ret = append(ret, aa...)
}
return ret
}
return bytes.Equal(pattrs(lhs.GetPathAttrs()), pattrs(rhs.GetPathAttrs()))
}
func (path *Path) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Nlri bgp.AddrPrefixInterface `json:"nlri"`
PathAttrs []bgp.PathAttributeInterface `json:"attrs"`
Age int64 `json:"age"`
Withdrawal bool `json:"withdrawal,omitempty"`
Validation string `json:"validation,omitempty"`
SourceID net.IP `json:"source-id,omitempty"`
NeighborIP net.IP `json:"neighbor-ip,omitempty"`
Stale bool `json:"stale,omitempty"`
Filtered bool `json:"filtered,omitempty"`
UUID string `json:"uuid,omitempty"`
}{
Nlri: path.GetNlri(),
PathAttrs: path.GetPathAttrs(),
Age: path.GetTimestamp().Unix(),
Withdrawal: path.IsWithdraw,
Validation: string(path.Validation()),
SourceID: path.GetSource().ID,
NeighborIP: path.GetSource().Address,
Stale: path.IsStale(),
Filtered: path.Filtered("") > POLICY_DIRECTION_NONE,
UUID: path.UUID().String(),
})
}
func (lhs *Path) Compare(rhs *Path) int {
if lhs.IsLocal() && !rhs.IsLocal() {
return 1
} else if !lhs.IsLocal() && rhs.IsLocal() {
return -1
}
if !lhs.IsIBGP() && rhs.IsIBGP() {
return 1
} else if lhs.IsIBGP() && !rhs.IsIBGP() {
return -1
}
lp1, _ := lhs.GetLocalPref()
lp2, _ := rhs.GetLocalPref()
if lp1 != lp2 {
return int(lp1 - lp2)
}
l1 := lhs.GetAsPathLen()
l2 := rhs.GetAsPathLen()
if l1 != l2 {
return int(l2 - l1)
}
o1, _ := lhs.GetOrigin()
o2, _ := rhs.GetOrigin()
if o1 != o2 {
return int(o2 - o1)
}
m1, _ := lhs.GetMed()
m2, _ := rhs.GetMed()
return int(m2 - m1)
}
func (v *Vrf) ToGlobalPath(path *Path) error {
nlri := path.GetNlri()
switch rf := path.GetRouteFamily(); rf {
case bgp.RF_IPv4_UC:
n := nlri.(*bgp.IPAddrPrefix)
path.OriginInfo().nlri = bgp.NewLabeledVPNIPAddrPrefix(n.Length, n.Prefix.String(), *bgp.NewMPLSLabelStack(0), v.Rd)
case bgp.RF_IPv6_UC:
n := nlri.(*bgp.IPv6AddrPrefix)
path.OriginInfo().nlri = bgp.NewLabeledVPNIPv6AddrPrefix(n.Length, n.Prefix.String(), *bgp.NewMPLSLabelStack(0), v.Rd)
case bgp.RF_EVPN:
n := nlri.(*bgp.EVPNNLRI)
switch n.RouteType {
case bgp.EVPN_ROUTE_TYPE_MAC_IP_ADVERTISEMENT:
n.RouteTypeData.(*bgp.EVPNMacIPAdvertisementRoute).RD = v.Rd
case bgp.EVPN_INCLUSIVE_MULTICAST_ETHERNET_TAG:
n.RouteTypeData.(*bgp.EVPNMulticastEthernetTagRoute).RD = v.Rd
}
default:
return fmt.Errorf("unsupported route family for vrf: %s", rf)
}
path.SetExtCommunities(v.ExportRt, false)
return nil
}
func (p *Path) ToGlobal(vrf *Vrf) *Path {
nlri := p.GetNlri()
nh := p.GetNexthop()
switch rf := p.GetRouteFamily(); rf {
case bgp.RF_IPv4_UC:
n := nlri.(*bgp.IPAddrPrefix)
nlri = bgp.NewLabeledVPNIPAddrPrefix(n.Length, n.Prefix.String(), *bgp.NewMPLSLabelStack(0), vrf.Rd)
case bgp.RF_IPv6_UC:
n := nlri.(*bgp.IPv6AddrPrefix)
nlri = bgp.NewLabeledVPNIPv6AddrPrefix(n.Length, n.Prefix.String(), *bgp.NewMPLSLabelStack(0), vrf.Rd)
case bgp.RF_EVPN:
n := nlri.(*bgp.EVPNNLRI)
switch n.RouteType {
case bgp.EVPN_ROUTE_TYPE_MAC_IP_ADVERTISEMENT:
old := n.RouteTypeData.(*bgp.EVPNMacIPAdvertisementRoute)
new := &bgp.EVPNMacIPAdvertisementRoute{
RD: vrf.Rd,
ESI: old.ESI,
ETag: old.ETag,
MacAddressLength: old.MacAddressLength,
MacAddress: old.MacAddress,
IPAddressLength: old.IPAddressLength,
IPAddress: old.IPAddress,
Labels: old.Labels,
}
nlri = bgp.NewEVPNNLRI(n.RouteType, n.Length, new)
case bgp.EVPN_INCLUSIVE_MULTICAST_ETHERNET_TAG:
old := n.RouteTypeData.(*bgp.EVPNMulticastEthernetTagRoute)
new := &bgp.EVPNMulticastEthernetTagRoute{
RD: vrf.Rd,
ETag: old.ETag,
IPAddressLength: old.IPAddressLength,
IPAddress: old.IPAddress,
}
nlri = bgp.NewEVPNNLRI(n.RouteType, n.Length, new)
}
default:
return p
}
path := NewPath(p.OriginInfo().source, nlri, p.IsWithdraw, p.GetPathAttrs(), p.OriginInfo().timestamp, false)
path.SetExtCommunities(vrf.ExportRt, false)
path.delPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
path.setPathAttr(bgp.NewPathAttributeMpReachNLRI(nh.String(), []bgp.AddrPrefixInterface{nlri}))
path.IsNexthopInvalid = p.IsNexthopInvalid
return path
}
func (p *Path) ToLocal() *Path {
nlri := p.GetNlri()
f := p.GetRouteFamily()
switch f {
case bgp.RF_IPv4_VPN:
n := nlri.(*bgp.LabeledVPNIPAddrPrefix)
_, c, _ := net.ParseCIDR(n.IPPrefix())
ones, _ := c.Mask.Size()
nlri = bgp.NewIPAddrPrefix(uint8(ones), c.IP.String())
case bgp.RF_IPv6_VPN:
n := nlri.(*bgp.LabeledVPNIPv6AddrPrefix)
_, c, _ := net.ParseCIDR(n.IPPrefix())
ones, _ := c.Mask.Size()
nlri = bgp.NewIPAddrPrefix(uint8(ones), c.IP.String())
default:
return p
}
path := NewPath(p.OriginInfo().source, nlri, p.IsWithdraw, p.GetPathAttrs(), p.OriginInfo().timestamp, false)
path.delPathAttr(bgp.BGP_ATTR_TYPE_EXTENDED_COMMUNITIES)
if f == bgp.RF_IPv4_VPN {
nh := path.GetNexthop()
path.delPathAttr(bgp.BGP_ATTR_TYPE_MP_REACH_NLRI)
path.setPathAttr(bgp.NewPathAttributeNextHop(nh.String()))
}
path.IsNexthopInvalid = p.IsNexthopInvalid
return path
}