Golang bgp.NewPathAttributeNextHop函数代码示例

func TestMrtRib(t *testing.T) {
	aspath1 := []bgp.AsPathParamInterface{
		bgp.NewAsPathParam(2, []uint16{1000}),
		bgp.NewAsPathParam(1, []uint16{1001, 1002}),
		bgp.NewAsPathParam(2, []uint16{1003, 1004}),
	}

	p := []bgp.PathAttributeInterface{
		bgp.NewPathAttributeOrigin(3),
		bgp.NewPathAttributeAsPath(aspath1),
		bgp.NewPathAttributeNextHop("129.1.1.2"),
		bgp.NewPathAttributeMultiExitDisc(1 << 20),
		bgp.NewPathAttributeLocalPref(1 << 22),
	}

	e1 := NewRibEntry(1, uint32(time.Now().Unix()), p)
	e2 := NewRibEntry(2, uint32(time.Now().Unix()), p)
	e3 := NewRibEntry(3, uint32(time.Now().Unix()), p)

	r1 := NewRib(1, bgp.NewIPAddrPrefix(24, "192.168.0.0"), []*RibEntry{e1, e2, e3})
	b1, err := r1.Serialize()
	if err != nil {
		t.Fatal(err)
	}
	r2 := &Rib{
		RouteFamily: bgp.RF_IPv4_UC,
	}
	err = r2.DecodeFromBytes(b1)
	if err != nil {
		t.Fatal(err)
	}
	assert.Equal(t, reflect.DeepEqual(r1, r2), true)
}

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()))
	}
	return path
}

func TestMrtRibEntry(t *testing.T) {
	aspath1 := []bgp.AsPathParamInterface{
		bgp.NewAsPathParam(2, []uint16{1000}),
		bgp.NewAsPathParam(1, []uint16{1001, 1002}),
		bgp.NewAsPathParam(2, []uint16{1003, 1004}),
	}

	p := []bgp.PathAttributeInterface{
		bgp.NewPathAttributeOrigin(3),
		bgp.NewPathAttributeAsPath(aspath1),
		bgp.NewPathAttributeNextHop("129.1.1.2"),
		bgp.NewPathAttributeMultiExitDisc(1 << 20),
		bgp.NewPathAttributeLocalPref(1 << 22),
	}

	e1 := NewRibEntry(1, uint32(time.Now().Unix()), p)
	b1, err := e1.Serialize()
	if err != nil {
		t.Fatal(err)
	}

	e2 := &RibEntry{}
	rest, err := e2.DecodeFromBytes(b1)
	if err != nil {
		t.Fatal(err)
	}
	assert.Equal(t, len(rest), 0)
	assert.Equal(t, reflect.DeepEqual(e1, e2), true)
}

func TestASPathLen(t *testing.T) {
	assert := assert.New(t)
	origin := bgp.NewPathAttributeOrigin(0)
	aspathParam := []bgp.AsPathParamInterface{
		bgp.NewAsPathParam(bgp.BGP_ASPATH_ATTR_TYPE_SEQ, []uint16{65001, 65002, 65003, 65004, 65004, 65004, 65004, 65004, 65005}),
		bgp.NewAsPathParam(bgp.BGP_ASPATH_ATTR_TYPE_SET, []uint16{65001, 65002, 65003, 65004, 65005}),
		bgp.NewAsPathParam(bgp.BGP_ASPATH_ATTR_TYPE_CONFED_SEQ, []uint16{65100, 65101, 65102}),
		bgp.NewAsPathParam(bgp.BGP_ASPATH_ATTR_TYPE_CONFED_SET, []uint16{65100, 65101})}
	aspath := bgp.NewPathAttributeAsPath(aspathParam)
	nexthop := bgp.NewPathAttributeNextHop("192.168.50.1")
	med := bgp.NewPathAttributeMultiExitDisc(0)

	pathAttributes := []bgp.PathAttributeInterface{
		origin,
		aspath,
		nexthop,
		med,
	}

	nlri := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpmsg := bgp.NewBGPUpdateMessage(nil, pathAttributes, nlri)
	update := bgpmsg.Body.(*bgp.BGPUpdate)
	UpdatePathAttrs4ByteAs(update)
	peer := PathCreatePeer()
	p := NewPath(peer[0], update.NLRI[0], false, update.PathAttributes, time.Now(), false)
	assert.Equal(10, p.GetAsPathLen())
}

func TestPathPrependAsnToExistingSeqAttr(t *testing.T) {
	assert := assert.New(t)
	origin := bgp.NewPathAttributeOrigin(0)
	aspathParam := []bgp.AsPathParamInterface{
		bgp.NewAsPathParam(bgp.BGP_ASPATH_ATTR_TYPE_SEQ, []uint16{65001, 65002, 65003, 65004, 65005}),
		bgp.NewAsPathParam(bgp.BGP_ASPATH_ATTR_TYPE_SET, []uint16{65001, 65002, 65003, 65004, 65005}),
		bgp.NewAsPathParam(bgp.BGP_ASPATH_ATTR_TYPE_CONFED_SEQ, []uint16{65100, 65101, 65102}),
		bgp.NewAsPathParam(bgp.BGP_ASPATH_ATTR_TYPE_CONFED_SET, []uint16{65100, 65101})}
	aspath := bgp.NewPathAttributeAsPath(aspathParam)
	nexthop := bgp.NewPathAttributeNextHop("192.168.50.1")

	pathAttributes := []bgp.PathAttributeInterface{
		origin,
		aspath,
		nexthop,
	}

	nlri := []*bgp.IPAddrPrefix{bgp.NewIPAddrPrefix(24, "10.10.10.0")}
	bgpmsg := bgp.NewBGPUpdateMessage(nil, pathAttributes, nlri)
	update := bgpmsg.Body.(*bgp.BGPUpdate)
	UpdatePathAttrs4ByteAs(update)
	peer := PathCreatePeer()
	p := NewPath(peer[0], update.NLRI[0], false, update.PathAttributes, time.Now(), false)

	p.PrependAsn(65000, 1)
	assert.Equal([]uint32{65000, 65001, 65002, 65003, 65004, 65005, 0, 0, 0}, p.GetAsSeqList())
	fmt.Printf("asns: %v", p.GetAsSeqList())
}

func TestTimeTieBreaker(t *testing.T) {
	origin := bgp.NewPathAttributeOrigin(0)
	aspathParam := []bgp.AsPathParamInterface{bgp.NewAs4PathParam(2, []uint32{65001})}
	aspath := bgp.NewPathAttributeAsPath(aspathParam)
	nexthop := bgp.NewPathAttributeNextHop("10.0.0.1")
	med := bgp.NewPathAttributeMultiExitDisc(0)
	pathAttributes := []bgp.PathAttributeInterface{origin, aspath, nexthop, med}
	nlri := bgp.NewIPAddrPrefix(24, "10.10.0.0")
	updateMsg := bgp.NewBGPUpdateMessage(nil, pathAttributes, []*bgp.IPAddrPrefix{nlri})
	peer1 := &PeerInfo{AS: 2, LocalAS: 1, Address: net.IP{1, 1, 1, 1}, ID: net.IP{1, 1, 1, 1}}
	path1 := ProcessMessage(updateMsg, peer1, time.Now())[0]

	peer2 := &PeerInfo{AS: 2, LocalAS: 1, Address: net.IP{2, 2, 2, 2}, ID: net.IP{2, 2, 2, 2}} // weaker router-id
	path2 := ProcessMessage(updateMsg, peer2, time.Now().Add(-1*time.Hour))[0]                 // older than path1

	d := NewDestination(nlri)
	d.AddNewPath(path1)
	d.AddNewPath(path2)

	d.Calculate(nil)

	assert.Equal(t, len(d.knownPathList), 2)
	assert.Equal(t, true, d.GetBestPath("").GetSource().ID.Equal(net.IP{2, 2, 2, 2})) // path from peer2 win

	// this option disables tie breaking by age
	SelectionOptions.ExternalCompareRouterId = true
	d = NewDestination(nlri)
	d.AddNewPath(path1)
	d.AddNewPath(path2)

	d.Calculate(nil)

	assert.Equal(t, len(d.knownPathList), 2)
	assert.Equal(t, true, d.GetBestPath("").GetSource().ID.Equal(net.IP{1, 1, 1, 1})) // path from peer1 win
}

//AddLocalProtoRoute is used to add local endpoint to the protocol RIB
func (self *OfnetBgp) AddLocalProtoRoute(pathInfo []*OfnetProtoRouteInfo) error {

	if self.routerIP == "" {
		//ignoring populating to the bgp rib because
		//Bgp is not configured.
		return nil
	}
	log.Infof("Received AddLocalProtoRoute to add local endpoint to protocol RIB: %+v", pathInfo)

	// add routes
	attrs := []bgp.PathAttributeInterface{
		bgp.NewPathAttributeOrigin(1),
		bgp.NewPathAttributeNextHop(pathInfo[0].nextHopIP),
		bgp.NewPathAttributeAsPath([]bgp.AsPathParamInterface{bgp.NewAs4PathParam(bgp.BGP_ASPATH_ATTR_TYPE_SEQ, []uint32{self.myBgpAs})}),
	}
	paths := []*table.Path{}
	for _, path := range pathInfo {
		paths = append(paths, table.NewPath(nil, bgp.NewIPAddrPrefix(32, path.localEpIP), false, attrs, time.Now(), false))
	}

	_, err := self.bgpServer.AddPath("", paths)
	if err != nil {
		return err
	}

	return nil
}

func TestGetPathAttrs(t *testing.T) {
	paths := PathCreatePath(PathCreatePeer())
	path0 := paths[0]
	path1 := path0.Clone(false)
	path1.delPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP)
	path2 := path1.Clone(false)
	path2.setPathAttr(bgp.NewPathAttributeNextHop("192.168.50.1"))
	assert.NotNil(t, path2.getPathAttr(bgp.BGP_ATTR_TYPE_NEXT_HOP))
}

func TestImplicitWithdrawCalculate(t *testing.T) {
	origin := bgp.NewPathAttributeOrigin(0)
	aspathParam := []bgp.AsPathParamInterface{bgp.NewAs4PathParam(2, []uint32{65001})}
	aspath := bgp.NewPathAttributeAsPath(aspathParam)
	nexthop := bgp.NewPathAttributeNextHop("10.0.0.1")
	med := bgp.NewPathAttributeMultiExitDisc(0)
	pathAttributes := []bgp.PathAttributeInterface{origin, aspath, nexthop, med}
	nlri := bgp.NewIPAddrPrefix(24, "10.10.0.101")
	updateMsg := bgp.NewBGPUpdateMessage(nil, pathAttributes, []*bgp.IPAddrPrefix{nlri})
	peer1 := &PeerInfo{AS: 1, Address: net.IP{1, 1, 1, 1}}
	path1 := ProcessMessage(updateMsg, peer1, time.Now())[0]
	path1.Filter("1", POLICY_DIRECTION_IMPORT)

	// suppose peer2 has import policy to prepend as-path
	action := &AsPathPrependAction{
		asn:    100,
		repeat: 1,
	}

	path2 := action.Apply(path1.Clone(false), nil)
	path1.Filter("2", POLICY_DIRECTION_IMPORT)
	path2.Filter("1", POLICY_DIRECTION_IMPORT)
	path2.Filter("3", POLICY_DIRECTION_IMPORT)

	d := NewDestination(nlri)
	d.AddNewPath(path1)
	d.AddNewPath(path2)

	d.Calculate(nil)

	assert.Equal(t, len(d.GetKnownPathList("1")), 0) // peer "1" is the originator
	assert.Equal(t, len(d.GetKnownPathList("2")), 1)
	assert.Equal(t, d.GetKnownPathList("2")[0].GetAsString(), "100 65001") // peer "2" has modified path {100, 65001}
	assert.Equal(t, len(d.GetKnownPathList("3")), 1)
	assert.Equal(t, d.GetKnownPathList("3")[0].GetAsString(), "65001") // peer "3" has original path {65001}
	assert.Equal(t, len(d.knownPathList), 2)

	// say, we removed peer2's import policy and
	// peer1 advertised new path with the same prefix
	aspathParam = []bgp.AsPathParamInterface{bgp.NewAs4PathParam(2, []uint32{65001, 65002})}
	aspath = bgp.NewPathAttributeAsPath(aspathParam)
	pathAttributes = []bgp.PathAttributeInterface{origin, aspath, nexthop, med}
	updateMsg = bgp.NewBGPUpdateMessage(nil, pathAttributes, []*bgp.IPAddrPrefix{nlri})
	path3 := ProcessMessage(updateMsg, peer1, time.Now())[0]
	path3.Filter("1", POLICY_DIRECTION_IMPORT)

	d.AddNewPath(path3)
	d.Calculate(nil)

	assert.Equal(t, len(d.GetKnownPathList("1")), 0) // peer "1" is the originator
	assert.Equal(t, len(d.GetKnownPathList("2")), 1)
	assert.Equal(t, d.GetKnownPathList("2")[0].GetAsString(), "65001 65002") // peer "2" has new original path {65001, 65002}
	assert.Equal(t, len(d.GetKnownPathList("3")), 1)
	assert.Equal(t, d.GetKnownPathList("3")[0].GetAsString(), "65001 65002") // peer "3" has new original path {65001, 65002}
	assert.Equal(t, len(d.knownPathList), 1)
}

func (bs *BgpService) DelPath(route string) error {
	attrs := []bgp.PathAttributeInterface{
		bgp.NewPathAttributeNextHop("0.0.0.0"),
	}

	if err := bs.bgp.DeletePath([]byte{}, bgp.RF_IPv4_UC, "", []*table.Path{table.NewPath(nil, bgp.NewIPAddrPrefix(32, route), true, attrs, time.Now(), false)}); err != nil {
		return fmt.Errorf("[bgp] Error deleting bgp path. %v", err)
	}

	return nil
}

func createPathFromIPRouteMessage(m *zebra.Message) *table.Path {

	header := m.Header
	body := m.Body.(*zebra.IPRouteBody)
	family := bgp.RF_IPv6_UC
	if header.Command == zebra.IPV4_ROUTE_ADD || header.Command == zebra.IPV4_ROUTE_DELETE {
		family = bgp.RF_IPv4_UC
	}

	var nlri bgp.AddrPrefixInterface
	pattr := make([]bgp.PathAttributeInterface, 0)
	var mpnlri *bgp.PathAttributeMpReachNLRI
	var isWithdraw bool = header.Command == zebra.IPV4_ROUTE_DELETE || header.Command == zebra.IPV6_ROUTE_DELETE

	origin := bgp.NewPathAttributeOrigin(bgp.BGP_ORIGIN_ATTR_TYPE_IGP)
	pattr = append(pattr, origin)

	log.WithFields(log.Fields{
		"Topic":        "Zebra",
		"RouteType":    body.Type.String(),
		"Flag":         body.Flags.String(),
		"Message":      body.Message,
		"Prefix":       body.Prefix,
		"PrefixLength": body.PrefixLength,
		"Nexthop":      body.Nexthops,
		"IfIndex":      body.Ifindexs,
		"Metric":       body.Metric,
		"Distance":     body.Distance,
		"api":          header.Command.String(),
	}).Debugf("create path from ip route message.")

	switch family {
	case bgp.RF_IPv4_UC:
		nlri = bgp.NewIPAddrPrefix(body.PrefixLength, body.Prefix.String())
		nexthop := bgp.NewPathAttributeNextHop(body.Nexthops[0].String())
		pattr = append(pattr, nexthop)
	case bgp.RF_IPv6_UC:
		nlri = bgp.NewIPv6AddrPrefix(body.PrefixLength, body.Prefix.String())
		mpnlri = bgp.NewPathAttributeMpReachNLRI(body.Nexthops[0].String(), []bgp.AddrPrefixInterface{nlri})
		pattr = append(pattr, mpnlri)
	default:
		log.WithFields(log.Fields{
			"Topic": "Zebra",
		}).Errorf("unsupport address family: %s", family)
		return nil
	}

	med := bgp.NewPathAttributeMultiExitDisc(body.Metric)
	pattr = append(pattr, med)

	path := table.NewPath(nil, nlri, isWithdraw, pattr, time.Now(), false)
	path.SetIsFromExternal(true)
	return path
}

func TestCalculate2(t *testing.T) {

	origin := bgp.NewPathAttributeOrigin(0)
	aspathParam := []bgp.AsPathParamInterface{bgp.NewAs4PathParam(2, []uint32{65001})}
	aspath := bgp.NewPathAttributeAsPath(aspathParam)
	nexthop := bgp.NewPathAttributeNextHop("10.0.0.1")
	med := bgp.NewPathAttributeMultiExitDisc(0)
	pathAttributes := []bgp.PathAttributeInterface{origin, aspath, nexthop, med}
	nlri := bgp.NewIPAddrPrefix(24, "10.10.0.0")

	// peer1 sends normal update message 10.10.0.0/24
	update1 := bgp.NewBGPUpdateMessage(nil, pathAttributes, []*bgp.IPAddrPrefix{nlri})
	peer1 := &PeerInfo{AS: 1, Address: net.IP{1, 1, 1, 1}}
	path1 := ProcessMessage(update1, peer1, time.Now())[0]

	d := NewDestination(nlri)
	d.AddNewPath(path1)
	d.Calculate(nil)

	// suppose peer2 sends grammaatically correct but semantically flawed update message
	// which has a withdrawal nlri not advertised before
	update2 := bgp.NewBGPUpdateMessage([]*bgp.IPAddrPrefix{nlri}, pathAttributes, nil)
	peer2 := &PeerInfo{AS: 2, Address: net.IP{2, 2, 2, 2}}
	path2 := ProcessMessage(update2, peer2, time.Now())[0]
	assert.Equal(t, path2.IsWithdraw, true)

	d.AddWithdraw(path2)
	d.Calculate(nil)

	// we have a path from peer1 here
	assert.Equal(t, len(d.knownPathList), 1)

	// after that, new update with the same nlri comes from peer2
	update3 := bgp.NewBGPUpdateMessage(nil, pathAttributes, []*bgp.IPAddrPrefix{nlri})
	path3 := ProcessMessage(update3, peer2, time.Now())[0]
	assert.Equal(t, path3.IsWithdraw, false)

	d.AddNewPath(path3)
	d.Calculate(nil)

	// this time, we have paths from peer1 and peer2
	assert.Equal(t, len(d.knownPathList), 2)

	// now peer3 sends normal update message 10.10.0.0/24
	peer3 := &PeerInfo{AS: 3, Address: net.IP{3, 3, 3, 3}}
	update4 := bgp.NewBGPUpdateMessage(nil, pathAttributes, []*bgp.IPAddrPrefix{nlri})
	path4 := ProcessMessage(update4, peer3, time.Now())[0]

	d.AddNewPath(path4)
	d.Calculate(nil)

	// we must have paths from peer1, peer2 and peer3
	assert.Equal(t, len(d.knownPathList), 3)
}

func (path *Path) SetNexthop(nexthop net.IP) {
	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 (bs *BgpService) AddPath(route string) error {
	attrs := []bgp.PathAttributeInterface{
		bgp.NewPathAttributeOrigin(0),
		bgp.NewPathAttributeNextHop("0.0.0.0"),
	}

	if _, err := bs.bgp.AddPath("", []*table.Path{table.NewPath(nil, bgp.NewIPAddrPrefix(32, route), false, attrs, time.Now(), false)}); err != nil {
		return fmt.Errorf("[bgp] Error adding bgp path. %v", err)
	}

	return nil
}

func createPathFromIPRouteMessage(m *zebra.Message, peerInfo *table.PeerInfo) *table.Path {

	header := m.Header
	body := m.Body.(*zebra.IPRouteBody)
	isV4 := header.Command == zebra.IPV4_ROUTE_ADD || header.Command == zebra.IPV4_ROUTE_DELETE

	var nlri bgp.AddrPrefixInterface
	pattr := make([]bgp.PathAttributeInterface, 0)
	var mpnlri *bgp.PathAttributeMpReachNLRI
	var isWithdraw bool = header.Command == zebra.IPV4_ROUTE_DELETE || header.Command == zebra.IPV6_ROUTE_DELETE

	origin := bgp.NewPathAttributeOrigin(bgp.BGP_ORIGIN_ATTR_TYPE_IGP)
	pattr = append(pattr, origin)

	log.WithFields(log.Fields{
		"Topic":        "Zebra",
		"RouteType":    body.Type.String(),
		"Flag":         body.Flags.String(),
		"Message":      body.Message,
		"Prefix":       body.Prefix,
		"PrefixLength": body.PrefixLength,
		"Nexthop":      body.Nexthops,
		"IfIndex":      body.Ifindexs,
		"Metric":       body.Metric,
		"Distance":     body.Distance,
		"api":          header.Command.String(),
	}).Debugf("create path from ip route message.")

	if isV4 {
		nlri = bgp.NewIPAddrPrefix(body.PrefixLength, body.Prefix.String())
		nexthop := bgp.NewPathAttributeNextHop(body.Nexthops[0].String())
		pattr = append(pattr, nexthop)
	} else {
		nlri = bgp.NewIPv6AddrPrefix(body.PrefixLength, body.Prefix.String())
		mpnlri = bgp.NewPathAttributeMpReachNLRI(body.Nexthops[0].String(), []bgp.AddrPrefixInterface{nlri})
		pattr = append(pattr, mpnlri)
	}

	med := bgp.NewPathAttributeMultiExitDisc(body.Metric)
	pattr = append(pattr, med)

	p := table.NewPath(peerInfo, nlri, isWithdraw, pattr, time.Now(), false)
	p.SetIsFromExternal(true)
	return p
}