Add app source, add vendoring and module support

vendor/github.com/osrg/gobgp/internal/pkg/config/default.go

@@ -0,0 +1,524 @@
+package config
+
+import (
+	"encoding/binary"
+	"fmt"
+	"math"
+	"net"
+	"reflect"
+	"strconv"
+
+	"github.com/osrg/gobgp/pkg/packet/bgp"
+	"github.com/osrg/gobgp/pkg/packet/bmp"
+	"github.com/osrg/gobgp/pkg/packet/rtr"
+	"github.com/spf13/viper"
+)
+
+const (
+	DEFAULT_HOLDTIME                  = 90
+	DEFAULT_IDLE_HOLDTIME_AFTER_RESET = 30
+	DEFAULT_CONNECT_RETRY             = 120
+)
+
+var forcedOverwrittenConfig = []string{
+	"neighbor.config.peer-as",
+	"neighbor.timers.config.minimum-advertisement-interval",
+}
+
+var configuredFields map[string]interface{}
+
+func RegisterConfiguredFields(addr string, n interface{}) {
+	if configuredFields == nil {
+		configuredFields = make(map[string]interface{})
+	}
+	configuredFields[addr] = n
+}
+
+func defaultAfiSafi(typ AfiSafiType, enable bool) AfiSafi {
+	return AfiSafi{
+		Config: AfiSafiConfig{
+			AfiSafiName: typ,
+			Enabled:     enable,
+		},
+		State: AfiSafiState{
+			AfiSafiName: typ,
+			Family:      bgp.AddressFamilyValueMap[string(typ)],
+		},
+	}
+}
+
+func SetDefaultNeighborConfigValues(n *Neighbor, pg *PeerGroup, g *Global) error {
+	// Determines this function is called against the same Neighbor struct,
+	// and if already called, returns immediately.
+	if n.State.LocalAs != 0 {
+		return nil
+	}
+
+	return setDefaultNeighborConfigValuesWithViper(nil, n, g, pg)
+}
+
+func setDefaultNeighborConfigValuesWithViper(v *viper.Viper, n *Neighbor, g *Global, pg *PeerGroup) error {
+	if n == nil {
+		return fmt.Errorf("neighbor config is nil")
+	}
+	if g == nil {
+		return fmt.Errorf("global config is nil")
+	}
+
+	if v == nil {
+		v = viper.New()
+	}
+
+	if pg != nil {
+		if err := OverwriteNeighborConfigWithPeerGroup(n, pg); err != nil {
+			return err
+		}
+	}
+
+	if n.Config.LocalAs == 0 {
+		n.Config.LocalAs = g.Config.As
+		if !g.Confederation.Config.Enabled || n.IsConfederation(g) {
+			n.Config.LocalAs = g.Config.As
+		} else {
+			n.Config.LocalAs = g.Confederation.Config.Identifier
+		}
+	}
+	n.State.LocalAs = n.Config.LocalAs
+
+	if n.Config.PeerAs != n.Config.LocalAs {
+		n.Config.PeerType = PEER_TYPE_EXTERNAL
+		n.State.PeerType = PEER_TYPE_EXTERNAL
+		n.State.RemovePrivateAs = n.Config.RemovePrivateAs
+		n.AsPathOptions.State.ReplacePeerAs = n.AsPathOptions.Config.ReplacePeerAs
+	} else {
+		n.Config.PeerType = PEER_TYPE_INTERNAL
+		n.State.PeerType = PEER_TYPE_INTERNAL
+		if string(n.Config.RemovePrivateAs) != "" {
+			return fmt.Errorf("can't set remove-private-as for iBGP peer")
+		}
+		if n.AsPathOptions.Config.ReplacePeerAs {
+			return fmt.Errorf("can't set replace-peer-as for iBGP peer")
+		}
+	}
+
+	if n.State.NeighborAddress == "" {
+		n.State.NeighborAddress = n.Config.NeighborAddress
+	}
+
+	n.State.PeerAs = n.Config.PeerAs
+	n.AsPathOptions.State.AllowOwnAs = n.AsPathOptions.Config.AllowOwnAs
+
+	if !v.IsSet("neighbor.error-handling.config.treat-as-withdraw") {
+		n.ErrorHandling.Config.TreatAsWithdraw = true
+	}
+
+	if !v.IsSet("neighbor.timers.config.connect-retry") && n.Timers.Config.ConnectRetry == 0 {
+		n.Timers.Config.ConnectRetry = float64(DEFAULT_CONNECT_RETRY)
+	}
+	if !v.IsSet("neighbor.timers.config.hold-time") && n.Timers.Config.HoldTime == 0 {
+		n.Timers.Config.HoldTime = float64(DEFAULT_HOLDTIME)
+	}
+	if !v.IsSet("neighbor.timers.config.keepalive-interval") && n.Timers.Config.KeepaliveInterval == 0 {
+		n.Timers.Config.KeepaliveInterval = n.Timers.Config.HoldTime / 3
+	}
+	if !v.IsSet("neighbor.timers.config.idle-hold-time-after-reset") && n.Timers.Config.IdleHoldTimeAfterReset == 0 {
+		n.Timers.Config.IdleHoldTimeAfterReset = float64(DEFAULT_IDLE_HOLDTIME_AFTER_RESET)
+	}
+
+	if n.Config.NeighborInterface != "" {
+		if n.RouteServer.Config.RouteServerClient {
+			return fmt.Errorf("configuring route server client as unnumbered peer is not supported")
+		}
+		addr, err := GetIPv6LinkLocalNeighborAddress(n.Config.NeighborInterface)
+		if err != nil {
+			return err
+		}
+		n.State.NeighborAddress = addr
+	}
+
+	if n.Transport.Config.LocalAddress == "" {
+		if n.State.NeighborAddress == "" {
+			return fmt.Errorf("no neighbor address/interface specified")
+		}
+		ipAddr, err := net.ResolveIPAddr("ip", n.State.NeighborAddress)
+		if err != nil {
+			return err
+		}
+		localAddress := "0.0.0.0"
+		if ipAddr.IP.To4() == nil {
+			localAddress = "::"
+			if ipAddr.Zone != "" {
+				localAddress, err = getIPv6LinkLocalAddress(ipAddr.Zone)
+				if err != nil {
+					return err
+				}
+			}
+		}
+		n.Transport.Config.LocalAddress = localAddress
+	}
+
+	if len(n.AfiSafis) == 0 {
+		if n.Config.NeighborInterface != "" {
+			n.AfiSafis = []AfiSafi{
+				defaultAfiSafi(AFI_SAFI_TYPE_IPV4_UNICAST, true),
+				defaultAfiSafi(AFI_SAFI_TYPE_IPV6_UNICAST, true),
+			}
+		} else if ipAddr, err := net.ResolveIPAddr("ip", n.State.NeighborAddress); err != nil {
+			return fmt.Errorf("invalid neighbor address: %s", n.State.NeighborAddress)
+		} else if ipAddr.IP.To4() != nil {
+			n.AfiSafis = []AfiSafi{defaultAfiSafi(AFI_SAFI_TYPE_IPV4_UNICAST, true)}
+		} else {
+			n.AfiSafis = []AfiSafi{defaultAfiSafi(AFI_SAFI_TYPE_IPV6_UNICAST, true)}
+		}
+		for i := range n.AfiSafis {
+			n.AfiSafis[i].AddPaths.Config.Receive = n.AddPaths.Config.Receive
+			n.AfiSafis[i].AddPaths.State.Receive = n.AddPaths.Config.Receive
+			n.AfiSafis[i].AddPaths.Config.SendMax = n.AddPaths.Config.SendMax
+			n.AfiSafis[i].AddPaths.State.SendMax = n.AddPaths.Config.SendMax
+		}
+	} else {
+		afs, err := extractArray(v.Get("neighbor.afi-safis"))
+		if err != nil {
+			return err
+		}
+		for i := range n.AfiSafis {
+			vv := viper.New()
+			if len(afs) > i {
+				vv.Set("afi-safi", afs[i])
+			}
+			rf, err := bgp.GetRouteFamily(string(n.AfiSafis[i].Config.AfiSafiName))
+			if err != nil {
+				return err
+			}
+			n.AfiSafis[i].State.Family = rf
+			n.AfiSafis[i].State.AfiSafiName = n.AfiSafis[i].Config.AfiSafiName
+			if !vv.IsSet("afi-safi.config.enabled") {
+				n.AfiSafis[i].Config.Enabled = true
+			}
+			n.AfiSafis[i].MpGracefulRestart.State.Enabled = n.AfiSafis[i].MpGracefulRestart.Config.Enabled
+			if !vv.IsSet("afi-safi.add-paths.config.receive") {
+				n.AfiSafis[i].AddPaths.Config.Receive = n.AddPaths.Config.Receive
+			}
+			n.AfiSafis[i].AddPaths.State.Receive = n.AfiSafis[i].AddPaths.Config.Receive
+			if !vv.IsSet("afi-safi.add-paths.config.send-max") {
+				n.AfiSafis[i].AddPaths.Config.SendMax = n.AddPaths.Config.SendMax
+			}
+			n.AfiSafis[i].AddPaths.State.SendMax = n.AfiSafis[i].AddPaths.Config.SendMax
+		}
+	}
+
+	n.State.Description = n.Config.Description
+	n.State.AdminDown = n.Config.AdminDown
+
+	if n.GracefulRestart.Config.Enabled {
+		if !v.IsSet("neighbor.graceful-restart.config.restart-time") && n.GracefulRestart.Config.RestartTime == 0 {
+			// RFC 4724 4. Operation
+			// A suggested default for the Restart Time is a value less than or
+			// equal to the HOLDTIME carried in the OPEN.
+			n.GracefulRestart.Config.RestartTime = uint16(n.Timers.Config.HoldTime)
+		}
+		if !v.IsSet("neighbor.graceful-restart.config.deferral-time") && n.GracefulRestart.Config.DeferralTime == 0 {
+			// RFC 4724 4.1. Procedures for the Restarting Speaker
+			// The value of this timer should be large
+			// enough, so as to provide all the peers of the Restarting Speaker with
+			// enough time to send all the routes to the Restarting Speaker
+			n.GracefulRestart.Config.DeferralTime = uint16(360)
+		}
+	}
+
+	if n.EbgpMultihop.Config.Enabled {
+		if n.TtlSecurity.Config.Enabled {
+			return fmt.Errorf("ebgp-multihop and ttl-security are mututally exclusive")
+		}
+		if n.EbgpMultihop.Config.MultihopTtl == 0 {
+			n.EbgpMultihop.Config.MultihopTtl = 255
+		}
+	} else if n.TtlSecurity.Config.Enabled {
+		if n.TtlSecurity.Config.TtlMin == 0 {
+			n.TtlSecurity.Config.TtlMin = 255
+		}
+	}
+
+	if n.RouteReflector.Config.RouteReflectorClient {
+		if n.RouteReflector.Config.RouteReflectorClusterId == "" {
+			n.RouteReflector.State.RouteReflectorClusterId = RrClusterIdType(g.Config.RouterId)
+		} else {
+			id := string(n.RouteReflector.Config.RouteReflectorClusterId)
+			if ip := net.ParseIP(id).To4(); ip != nil {
+				n.RouteReflector.State.RouteReflectorClusterId = n.RouteReflector.Config.RouteReflectorClusterId
+			} else if num, err := strconv.ParseUint(id, 10, 32); err == nil {
+				ip = make(net.IP, 4)
+				binary.BigEndian.PutUint32(ip, uint32(num))
+				n.RouteReflector.State.RouteReflectorClusterId = RrClusterIdType(ip.String())
+			} else {
+				return fmt.Errorf("route-reflector-cluster-id should be specified as IPv4 address or 32-bit unsigned integer")
+			}
+		}
+	}
+
+	return nil
+}
+
+func SetDefaultGlobalConfigValues(g *Global) error {
+	if len(g.AfiSafis) == 0 {
+		g.AfiSafis = []AfiSafi{}
+		for k := range AfiSafiTypeToIntMap {
+			g.AfiSafis = append(g.AfiSafis, defaultAfiSafi(k, true))
+		}
+	}
+
+	if g.Config.Port == 0 {
+		g.Config.Port = bgp.BGP_PORT
+	}
+
+	if len(g.Config.LocalAddressList) == 0 {
+		g.Config.LocalAddressList = []string{"0.0.0.0", "::"}
+	}
+	return nil
+}
+
+func setDefaultVrfConfigValues(v *Vrf) error {
+	if v == nil {
+		return fmt.Errorf("cannot set default values for nil vrf config")
+	}
+
+	if v.Config.Name == "" {
+		return fmt.Errorf("specify vrf name")
+	}
+
+	_, err := bgp.ParseRouteDistinguisher(v.Config.Rd)
+	if err != nil {
+		return fmt.Errorf("invalid rd for vrf %s: %s", v.Config.Name, v.Config.Rd)
+	}
+
+	if len(v.Config.ImportRtList) == 0 {
+		v.Config.ImportRtList = v.Config.BothRtList
+	}
+	for _, rtString := range v.Config.ImportRtList {
+		_, err := bgp.ParseRouteTarget(rtString)
+		if err != nil {
+			return fmt.Errorf("invalid import rt for vrf %s: %s", v.Config.Name, rtString)
+		}
+	}
+
+	if len(v.Config.ExportRtList) == 0 {
+		v.Config.ExportRtList = v.Config.BothRtList
+	}
+	for _, rtString := range v.Config.ExportRtList {
+		_, err := bgp.ParseRouteTarget(rtString)
+		if err != nil {
+			return fmt.Errorf("invalid export rt for vrf %s: %s", v.Config.Name, rtString)
+		}
+	}
+
+	return nil
+}
+
+func SetDefaultConfigValues(b *BgpConfigSet) error {
+	return setDefaultConfigValuesWithViper(nil, b)
+}
+
+func setDefaultPolicyConfigValuesWithViper(v *viper.Viper, p *PolicyDefinition) error {
+	stmts, err := extractArray(v.Get("policy.statements"))
+	if err != nil {
+		return err
+	}
+	for i := range p.Statements {
+		vv := viper.New()
+		if len(stmts) > i {
+			vv.Set("statement", stmts[i])
+		}
+		if !vv.IsSet("statement.actions.route-disposition") {
+			p.Statements[i].Actions.RouteDisposition = ROUTE_DISPOSITION_NONE
+		}
+	}
+	return nil
+}
+
+func setDefaultConfigValuesWithViper(v *viper.Viper, b *BgpConfigSet) error {
+	if v == nil {
+		v = viper.New()
+	}
+
+	if err := SetDefaultGlobalConfigValues(&b.Global); err != nil {
+		return err
+	}
+
+	for idx, server := range b.BmpServers {
+		if server.Config.Port == 0 {
+			server.Config.Port = bmp.BMP_DEFAULT_PORT
+		}
+		if server.Config.RouteMonitoringPolicy == "" {
+			server.Config.RouteMonitoringPolicy = BMP_ROUTE_MONITORING_POLICY_TYPE_PRE_POLICY
+		}
+		// statistics-timeout is uint16 value and implicitly less than 65536
+		if server.Config.StatisticsTimeout != 0 && server.Config.StatisticsTimeout < 15 {
+			return fmt.Errorf("too small statistics-timeout value: %d", server.Config.StatisticsTimeout)
+		}
+		b.BmpServers[idx] = server
+	}
+
+	vrfNames := make(map[string]struct{})
+	vrfIDs := make(map[uint32]struct{})
+	for idx, vrf := range b.Vrfs {
+		if err := setDefaultVrfConfigValues(&vrf); err != nil {
+			return err
+		}
+
+		if _, ok := vrfNames[vrf.Config.Name]; ok {
+			return fmt.Errorf("duplicated vrf name: %s", vrf.Config.Name)
+		}
+		vrfNames[vrf.Config.Name] = struct{}{}
+
+		if vrf.Config.Id != 0 {
+			if _, ok := vrfIDs[vrf.Config.Id]; ok {
+				return fmt.Errorf("duplicated vrf id: %d", vrf.Config.Id)
+			}
+			vrfIDs[vrf.Config.Id] = struct{}{}
+		}
+
+		b.Vrfs[idx] = vrf
+	}
+	// Auto assign VRF identifier
+	for idx, vrf := range b.Vrfs {
+		if vrf.Config.Id == 0 {
+			for id := uint32(1); id < math.MaxUint32; id++ {
+				if _, ok := vrfIDs[id]; !ok {
+					vrf.Config.Id = id
+					vrfIDs[id] = struct{}{}
+					break
+				}
+			}
+		}
+		b.Vrfs[idx] = vrf
+	}
+
+	if b.Zebra.Config.Url == "" {
+		b.Zebra.Config.Url = "unix:/var/run/quagga/zserv.api"
+	}
+	if b.Zebra.Config.Version < 2 {
+		b.Zebra.Config.Version = 2
+	} else if b.Zebra.Config.Version > 5 {
+		b.Zebra.Config.Version = 5
+	}
+	if !v.IsSet("zebra.config.nexthop-trigger-enable") && !b.Zebra.Config.NexthopTriggerEnable && b.Zebra.Config.Version > 2 {
+		b.Zebra.Config.NexthopTriggerEnable = true
+	}
+	if b.Zebra.Config.NexthopTriggerDelay == 0 {
+		b.Zebra.Config.NexthopTriggerDelay = 5
+	}
+
+	list, err := extractArray(v.Get("neighbors"))
+	if err != nil {
+		return err
+	}
+
+	for idx, n := range b.Neighbors {
+		vv := viper.New()
+		if len(list) > idx {
+			vv.Set("neighbor", list[idx])
+		}
+
+		pg, err := b.getPeerGroup(n.Config.PeerGroup)
+		if err != nil {
+			return nil
+		}
+
+		if pg != nil {
+			identifier := vv.Get("neighbor.config.neighbor-address")
+			if identifier == nil {
+				identifier = vv.Get("neighbor.config.neighbor-interface")
+			}
+			RegisterConfiguredFields(identifier.(string), list[idx])
+		}
+
+		if err := setDefaultNeighborConfigValuesWithViper(vv, &n, &b.Global, pg); err != nil {
+			return err
+		}
+		b.Neighbors[idx] = n
+	}
+
+	for _, d := range b.DynamicNeighbors {
+		if err := d.validate(b); err != nil {
+			return err
+		}
+	}
+
+	for idx, r := range b.RpkiServers {
+		if r.Config.Port == 0 {
+			b.RpkiServers[idx].Config.Port = rtr.RPKI_DEFAULT_PORT
+		}
+	}
+
+	list, err = extractArray(v.Get("policy-definitions"))
+	if err != nil {
+		return err
+	}
+
+	for idx, p := range b.PolicyDefinitions {
+		vv := viper.New()
+		if len(list) > idx {
+			vv.Set("policy", list[idx])
+		}
+		if err := setDefaultPolicyConfigValuesWithViper(vv, &p); err != nil {
+			return err
+		}
+		b.PolicyDefinitions[idx] = p
+	}
+
+	return nil
+}
+
+func OverwriteNeighborConfigWithPeerGroup(c *Neighbor, pg *PeerGroup) error {
+	v := viper.New()
+
+	val, ok := configuredFields[c.Config.NeighborAddress]
+	if ok {
+		v.Set("neighbor", val)
+	} else {
+		v.Set("neighbor.config.peer-group", c.Config.PeerGroup)
+	}
+
+	overwriteConfig(&c.Config, &pg.Config, "neighbor.config", v)
+	overwriteConfig(&c.Timers.Config, &pg.Timers.Config, "neighbor.timers.config", v)
+	overwriteConfig(&c.Transport.Config, &pg.Transport.Config, "neighbor.transport.config", v)
+	overwriteConfig(&c.ErrorHandling.Config, &pg.ErrorHandling.Config, "neighbor.error-handling.config", v)
+	overwriteConfig(&c.LoggingOptions.Config, &pg.LoggingOptions.Config, "neighbor.logging-options.config", v)
+	overwriteConfig(&c.EbgpMultihop.Config, &pg.EbgpMultihop.Config, "neighbor.ebgp-multihop.config", v)
+	overwriteConfig(&c.RouteReflector.Config, &pg.RouteReflector.Config, "neighbor.route-reflector.config", v)
+	overwriteConfig(&c.AsPathOptions.Config, &pg.AsPathOptions.Config, "neighbor.as-path-options.config", v)
+	overwriteConfig(&c.AddPaths.Config, &pg.AddPaths.Config, "neighbor.add-paths.config", v)
+	overwriteConfig(&c.GracefulRestart.Config, &pg.GracefulRestart.Config, "neighbor.gradeful-restart.config", v)
+	overwriteConfig(&c.ApplyPolicy.Config, &pg.ApplyPolicy.Config, "neighbor.apply-policy.config", v)
+	overwriteConfig(&c.UseMultiplePaths.Config, &pg.UseMultiplePaths.Config, "neighbor.use-multiple-paths.config", v)
+	overwriteConfig(&c.RouteServer.Config, &pg.RouteServer.Config, "neighbor.route-server.config", v)
+	overwriteConfig(&c.TtlSecurity.Config, &pg.TtlSecurity.Config, "neighbor.ttl-security.config", v)
+
+	if !v.IsSet("neighbor.afi-safis") {
+		c.AfiSafis = append(c.AfiSafis, pg.AfiSafis...)
+	}
+
+	return nil
+}
+
+func overwriteConfig(c, pg interface{}, tagPrefix string, v *viper.Viper) {
+	nValue := reflect.Indirect(reflect.ValueOf(c))
+	nType := reflect.Indirect(nValue).Type()
+	pgValue := reflect.Indirect(reflect.ValueOf(pg))
+	pgType := reflect.Indirect(pgValue).Type()
+
+	for i := 0; i < pgType.NumField(); i++ {
+		field := pgType.Field(i).Name
+		tag := tagPrefix + "." + nType.Field(i).Tag.Get("mapstructure")
+		if func() bool {
+			for _, t := range forcedOverwrittenConfig {
+				if t == tag {
+					return true
+				}
+			}
+			return false
+		}() || !v.IsSet(tag) {
+			nValue.FieldByName(field).Set(pgValue.FieldByName(field))
+		}
+	}
+}

vendor/github.com/osrg/gobgp/internal/pkg/config/default_linux.go

@@ -0,0 +1,72 @@
+// Copyright (C) 2016 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.
+// +build linux
+
+package config
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/vishvananda/netlink"
+)
+
+func GetIPv6LinkLocalNeighborAddress(ifname string) (string, error) {
+	ifi, err := net.InterfaceByName(ifname)
+	if err != nil {
+		return "", err
+	}
+	neighs, err := netlink.NeighList(ifi.Index, netlink.FAMILY_V6)
+	if err != nil {
+		return "", err
+	}
+	cnt := 0
+	var addr net.IP
+	for _, neigh := range neighs {
+		local, err := isLocalLinkLocalAddress(ifi.Index, neigh.IP)
+		if err != nil {
+			return "", err
+		}
+		if neigh.State&netlink.NUD_FAILED == 0 && neigh.IP.IsLinkLocalUnicast() && !local {
+			addr = neigh.IP
+			cnt++
+		}
+	}
+
+	if cnt == 0 {
+		return "", fmt.Errorf("no ipv6 link-local neighbor found")
+	} else if cnt > 1 {
+		return "", fmt.Errorf("found %d link-local neighbors. only support p2p link", cnt)
+	}
+
+	return fmt.Sprintf("%s%%%s", addr, ifname), nil
+}
+
+func isLocalLinkLocalAddress(ifindex int, addr net.IP) (bool, error) {
+	ifi, err := net.InterfaceByIndex(ifindex)
+	if err != nil {
+		return false, err
+	}
+	addrs, err := ifi.Addrs()
+	if err != nil {
+		return false, err
+	}
+	for _, a := range addrs {
+		if ip, _, _ := net.ParseCIDR(a.String()); addr.Equal(ip) {
+			return true, nil
+		}
+	}
+	return false, nil
+}

vendor/github.com/osrg/gobgp/internal/pkg/config/default_nonlinux.go

@@ -0,0 +1,25 @@
+// Copyright (C) 2016 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.
+// +build !linux
+
+package config
+
+import (
+	"fmt"
+)
+
+func GetIPv6LinkLocalNeighborAddress(ifname string) (string, error) {
+	return "", fmt.Errorf("unnumbered peering is not supported")
+}

vendor/github.com/osrg/gobgp/internal/pkg/config/serve.go

@@ -0,0 +1,159 @@
+package config
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/viper"
+)
+
+type BgpConfigSet struct {
+	Global            Global             `mapstructure:"global"`
+	Neighbors         []Neighbor         `mapstructure:"neighbors"`
+	PeerGroups        []PeerGroup        `mapstructure:"peer-groups"`
+	RpkiServers       []RpkiServer       `mapstructure:"rpki-servers"`
+	BmpServers        []BmpServer        `mapstructure:"bmp-servers"`
+	Vrfs              []Vrf              `mapstructure:"vrfs"`
+	MrtDump           []Mrt              `mapstructure:"mrt-dump"`
+	Zebra             Zebra              `mapstructure:"zebra"`
+	Collector         Collector          `mapstructure:"collector"`
+	DefinedSets       DefinedSets        `mapstructure:"defined-sets"`
+	PolicyDefinitions []PolicyDefinition `mapstructure:"policy-definitions"`
+	DynamicNeighbors  []DynamicNeighbor  `mapstructure:"dynamic-neighbors"`
+}
+
+func ReadConfigfileServe(path, format string, configCh chan *BgpConfigSet) {
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, syscall.SIGHUP)
+
+	// Update config file type, if detectable
+	format = detectConfigFileType(path, format)
+
+	cnt := 0
+	for {
+		c := &BgpConfigSet{}
+		v := viper.New()
+		v.SetConfigFile(path)
+		v.SetConfigType(format)
+		var err error
+		if err = v.ReadInConfig(); err != nil {
+			goto ERROR
+		}
+		if err = v.UnmarshalExact(c); err != nil {
+			goto ERROR
+		}
+		if err = setDefaultConfigValuesWithViper(v, c); err != nil {
+			goto ERROR
+		}
+		if cnt == 0 {
+			log.WithFields(log.Fields{
+				"Topic": "Config",
+			}).Info("Finished reading the config file")
+		}
+		cnt++
+		configCh <- c
+		goto NEXT
+	ERROR:
+		if cnt == 0 {
+			log.WithFields(log.Fields{
+				"Topic": "Config",
+				"Error": err,
+			}).Fatalf("Can't read config file %s", path)
+		} else {
+			log.WithFields(log.Fields{
+				"Topic": "Config",
+				"Error": err,
+			}).Warningf("Can't read config file %s", path)
+		}
+	NEXT:
+		<-sigCh
+		log.WithFields(log.Fields{
+			"Topic": "Config",
+		}).Info("Reload the config file")
+	}
+}
+
+func ConfigSetToRoutingPolicy(c *BgpConfigSet) *RoutingPolicy {
+	return &RoutingPolicy{
+		DefinedSets:       c.DefinedSets,
+		PolicyDefinitions: c.PolicyDefinitions,
+	}
+}
+
+func UpdatePeerGroupConfig(curC, newC *BgpConfigSet) ([]PeerGroup, []PeerGroup, []PeerGroup) {
+	addedPg := []PeerGroup{}
+	deletedPg := []PeerGroup{}
+	updatedPg := []PeerGroup{}
+
+	for _, n := range newC.PeerGroups {
+		if idx := existPeerGroup(n.Config.PeerGroupName, curC.PeerGroups); idx < 0 {
+			addedPg = append(addedPg, n)
+		} else if !n.Equal(&curC.PeerGroups[idx]) {
+			log.WithFields(log.Fields{
+				"Topic": "Config",
+			}).Debugf("Current peer-group config:%v", curC.PeerGroups[idx])
+			log.WithFields(log.Fields{
+				"Topic": "Config",
+			}).Debugf("New peer-group config:%v", n)
+			updatedPg = append(updatedPg, n)
+		}
+	}
+
+	for _, n := range curC.PeerGroups {
+		if existPeerGroup(n.Config.PeerGroupName, newC.PeerGroups) < 0 {
+			deletedPg = append(deletedPg, n)
+		}
+	}
+	return addedPg, deletedPg, updatedPg
+}
+
+func UpdateNeighborConfig(curC, newC *BgpConfigSet) ([]Neighbor, []Neighbor, []Neighbor) {
+	added := []Neighbor{}
+	deleted := []Neighbor{}
+	updated := []Neighbor{}
+
+	for _, n := range newC.Neighbors {
+		if idx := inSlice(n, curC.Neighbors); idx < 0 {
+			added = append(added, n)
+		} else if !n.Equal(&curC.Neighbors[idx]) {
+			log.WithFields(log.Fields{
+				"Topic": "Config",
+			}).Debugf("Current neighbor config:%v", curC.Neighbors[idx])
+			log.WithFields(log.Fields{
+				"Topic": "Config",
+			}).Debugf("New neighbor config:%v", n)
+			updated = append(updated, n)
+		}
+	}
+
+	for _, n := range curC.Neighbors {
+		if inSlice(n, newC.Neighbors) < 0 {
+			deleted = append(deleted, n)
+		}
+	}
+	return added, deleted, updated
+}
+
+func CheckPolicyDifference(currentPolicy *RoutingPolicy, newPolicy *RoutingPolicy) bool {
+
+	log.WithFields(log.Fields{
+		"Topic": "Config",
+	}).Debugf("Current policy:%v", currentPolicy)
+	log.WithFields(log.Fields{
+		"Topic": "Config",
+	}).Debugf("New policy:%v", newPolicy)
+
+	var result bool
+	if currentPolicy == nil && newPolicy == nil {
+		result = false
+	} else {
+		if currentPolicy != nil && newPolicy != nil {
+			result = !currentPolicy.Equal(newPolicy)
+		} else {
+			result = true
+		}
+	}
+	return result
+}

vendor/github.com/osrg/gobgp/internal/pkg/config/util.go

@@ -0,0 +1,264 @@
+// Copyright (C) 2015 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 config
+
+import (
+	"fmt"
+	"net"
+	"path/filepath"
+	"regexp"
+	"strconv"
+
+	"github.com/osrg/gobgp/pkg/packet/bgp"
+)
+
+// Returns config file type by retrieving extension from the given path.
+// If no corresponding type found, returns the given def as the default value.
+func detectConfigFileType(path, def string) string {
+	switch ext := filepath.Ext(path); ext {
+	case ".toml":
+		return "toml"
+	case ".yaml", ".yml":
+		return "yaml"
+	case ".json":
+		return "json"
+	default:
+		return def
+	}
+}
+
+// yaml is decoded as []interface{}
+// but toml is decoded as []map[string]interface{}.
+// currently, viper can't hide this difference.
+// handle the difference here.
+func extractArray(intf interface{}) ([]interface{}, error) {
+	if intf != nil {
+		list, ok := intf.([]interface{})
+		if ok {
+			return list, nil
+		}
+		l, ok := intf.([]map[string]interface{})
+		if !ok {
+			return nil, fmt.Errorf("invalid configuration: neither []interface{} nor []map[string]interface{}")
+		}
+		list = make([]interface{}, 0, len(l))
+		for _, m := range l {
+			list = append(list, m)
+		}
+		return list, nil
+	}
+	return nil, nil
+}
+
+func getIPv6LinkLocalAddress(ifname string) (string, error) {
+	ifi, err := net.InterfaceByName(ifname)
+	if err != nil {
+		return "", err
+	}
+	addrs, err := ifi.Addrs()
+	if err != nil {
+		return "", err
+	}
+	for _, addr := range addrs {
+		ip := addr.(*net.IPNet).IP
+		if ip.To4() == nil && ip.IsLinkLocalUnicast() {
+			return fmt.Sprintf("%s%%%s", ip.String(), ifname), nil
+		}
+	}
+	return "", fmt.Errorf("no ipv6 link local address for %s", ifname)
+}
+
+func (b *BgpConfigSet) getPeerGroup(n string) (*PeerGroup, error) {
+	if n == "" {
+		return nil, nil
+	}
+	for _, pg := range b.PeerGroups {
+		if n == pg.Config.PeerGroupName {
+			return &pg, nil
+		}
+	}
+	return nil, fmt.Errorf("no such peer-group: %s", n)
+}
+
+func (d *DynamicNeighbor) validate(b *BgpConfigSet) error {
+	if d.Config.PeerGroup == "" {
+		return fmt.Errorf("dynamic neighbor requires the peer group config")
+	}
+
+	if _, err := b.getPeerGroup(d.Config.PeerGroup); err != nil {
+		return err
+	}
+	if _, _, err := net.ParseCIDR(d.Config.Prefix); err != nil {
+		return fmt.Errorf("invalid dynamic neighbor prefix %s", d.Config.Prefix)
+	}
+	return nil
+}
+
+func (n *Neighbor) IsConfederationMember(g *Global) bool {
+	for _, member := range g.Confederation.Config.MemberAsList {
+		if member == n.Config.PeerAs {
+			return true
+		}
+	}
+	return false
+}
+
+func (n *Neighbor) IsConfederation(g *Global) bool {
+	if n.Config.PeerAs == g.Config.As {
+		return true
+	}
+	return n.IsConfederationMember(g)
+}
+
+func (n *Neighbor) IsEBGPPeer(g *Global) bool {
+	return n.Config.PeerAs != g.Config.As
+}
+
+func (n *Neighbor) CreateRfMap() map[bgp.RouteFamily]bgp.BGPAddPathMode {
+	rfMap := make(map[bgp.RouteFamily]bgp.BGPAddPathMode)
+	for _, af := range n.AfiSafis {
+		mode := bgp.BGP_ADD_PATH_NONE
+		if af.AddPaths.State.Receive {
+			mode |= bgp.BGP_ADD_PATH_RECEIVE
+		}
+		if af.AddPaths.State.SendMax > 0 {
+			mode |= bgp.BGP_ADD_PATH_SEND
+		}
+		rfMap[af.State.Family] = mode
+	}
+	return rfMap
+}
+
+func (n *Neighbor) GetAfiSafi(family bgp.RouteFamily) *AfiSafi {
+	for _, a := range n.AfiSafis {
+		if string(a.Config.AfiSafiName) == family.String() {
+			return &a
+		}
+	}
+	return nil
+}
+
+func (n *Neighbor) ExtractNeighborAddress() (string, error) {
+	addr := n.State.NeighborAddress
+	if addr == "" {
+		addr = n.Config.NeighborAddress
+		if addr == "" {
+			return "", fmt.Errorf("NeighborAddress is not configured")
+		}
+	}
+	return addr, nil
+}
+
+func (n *Neighbor) IsAddPathReceiveEnabled(family bgp.RouteFamily) bool {
+	for _, af := range n.AfiSafis {
+		if af.State.Family == family {
+			return af.AddPaths.State.Receive
+		}
+	}
+	return false
+}
+
+type AfiSafis []AfiSafi
+
+func (c AfiSafis) ToRfList() ([]bgp.RouteFamily, error) {
+	rfs := make([]bgp.RouteFamily, 0, len(c))
+	for _, af := range c {
+		rfs = append(rfs, af.State.Family)
+	}
+	return rfs, nil
+}
+
+func inSlice(n Neighbor, b []Neighbor) int {
+	for i, nb := range b {
+		if nb.State.NeighborAddress == n.State.NeighborAddress {
+			return i
+		}
+	}
+	return -1
+}
+
+func existPeerGroup(n string, b []PeerGroup) int {
+	for i, nb := range b {
+		if nb.Config.PeerGroupName == n {
+			return i
+		}
+	}
+	return -1
+}
+
+func isAfiSafiChanged(x, y []AfiSafi) bool {
+	if len(x) != len(y) {
+		return true
+	}
+	m := make(map[string]bool)
+	for _, e := range x {
+		m[string(e.Config.AfiSafiName)] = true
+	}
+	for _, e := range y {
+		if !m[string(e.Config.AfiSafiName)] {
+			return true
+		}
+	}
+	return false
+}
+
+func (n *Neighbor) NeedsResendOpenMessage(new *Neighbor) bool {
+	return !n.Config.Equal(&new.Config) ||
+		!n.Transport.Config.Equal(&new.Transport.Config) ||
+		!n.AddPaths.Config.Equal(&new.AddPaths.Config) ||
+		!n.GracefulRestart.Config.Equal(&new.GracefulRestart.Config) ||
+		isAfiSafiChanged(n.AfiSafis, new.AfiSafis)
+}
+
+// TODO: these regexp are duplicated in api
+var _regexpPrefixMaskLengthRange = regexp.MustCompile(`(\d+)\.\.(\d+)`)
+
+func ParseMaskLength(prefix, mask string) (int, int, error) {
+	_, ipNet, err := net.ParseCIDR(prefix)
+	if err != nil {
+		return 0, 0, fmt.Errorf("invalid prefix: %s", prefix)
+	}
+	if mask == "" {
+		l, _ := ipNet.Mask.Size()
+		return l, l, nil
+	}
+	elems := _regexpPrefixMaskLengthRange.FindStringSubmatch(mask)
+	if len(elems) != 3 {
+		return 0, 0, fmt.Errorf("invalid mask length range: %s", mask)
+	}
+	// we've already checked the range is sane by regexp
+	min, _ := strconv.ParseUint(elems[1], 10, 8)
+	max, _ := strconv.ParseUint(elems[2], 10, 8)
+	if min > max {
+		return 0, 0, fmt.Errorf("invalid mask length range: %s", mask)
+	}
+	if ipv4 := ipNet.IP.To4(); ipv4 != nil {
+		f := func(i uint64) bool {
+			return i <= 32
+		}
+		if !f(min) || !f(max) {
+			return 0, 0, fmt.Errorf("ipv4 mask length range outside scope :%s", mask)
+		}
+	} else {
+		f := func(i uint64) bool {
+			return i <= 128
+		}
+		if !f(min) || !f(max) {
+			return 0, 0, fmt.Errorf("ipv6 mask length range outside scope :%s", mask)
+		}
+	}
+	return int(min), int(max), nil
+}