mirror of
https://github.com/cloudnativelabs/kube-router.git
synced 2025-10-14 19:31:09 +02:00
55 lines
1.5 KiB
Go
55 lines
1.5 KiB
Go
// Copyright (C) 2016 Nippon Telegraph and Telephone Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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// implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build linux
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package config
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import (
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"fmt"
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"github.com/vishvananda/netlink"
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"net"
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)
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func GetIPv6LinkLocalNeighborAddress(ifname string) (string, error) {
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ifi, err := net.InterfaceByName(ifname)
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if err != nil {
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return "", err
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}
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neighs, err := netlink.NeighList(ifi.Index, netlink.FAMILY_V6)
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if err != nil {
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return "", err
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}
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cnt := 0
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var addr net.IP
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for _, neigh := range neighs {
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local, err := isLocalLinkLocalAddress(ifi.Index, neigh.IP)
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if err != nil {
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return "", err
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}
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if neigh.State&netlink.NUD_FAILED == 0 && neigh.IP.IsLinkLocalUnicast() && !local {
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addr = neigh.IP
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cnt += 1
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}
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}
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if cnt == 0 {
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return "", fmt.Errorf("no ipv6 link-local neighbor found")
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} else if cnt > 1 {
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return "", fmt.Errorf("found %d link-local neighbors. only support p2p link", cnt)
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}
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return fmt.Sprintf("%s%%%s", addr, ifname), nil
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}
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