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// 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
}
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