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// 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/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
}
}
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 CheckAfiSafisChange(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 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
}
exp := regexp.MustCompile("(\\d+)\\.\\.(\\d+)")
elems := exp.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.Atoi(elems[1])
max, _ := strconv.Atoi(elems[2])
if min > max {
return 0, 0, fmt.Errorf("invalid mask length range: %s", mask)
}
if ipv4 := ipNet.IP.To4(); ipv4 != nil {
f := func(i int) bool {
return i >= 0 && i <= 32
}
if !f(min) || !f(max) {
return 0, 0, fmt.Errorf("ipv4 mask length range outside scope :%s", mask)
}
} else {
f := func(i int) bool {
return i >= 0 && i <= 128
}
if !f(min) || !f(max) {
return 0, 0, fmt.Errorf("ipv6 mask length range outside scope :%s", mask)
}
}
return min, max, nil
}
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