mirror of
https://github.com/osrg/gobgp.git
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FUJITA Tomonori
c593d7c8b3
seems that sticking to Go API v1 for protobuf is headache for projects using GoBGP. This breaks the compatibility so bumps up the major version to 3. Signed-off-by: FUJITA Tomonori <[email protected]>
74 lines
1.8 KiB
Go
74 lines
1.8 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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//go:build linux
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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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"net"
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"github.com/vishvananda/netlink"
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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++
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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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func isLocalLinkLocalAddress(ifindex int, addr net.IP) (bool, error) {
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ifi, err := net.InterfaceByIndex(ifindex)
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if err != nil {
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return false, err
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}
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addrs, err := ifi.Addrs()
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if err != nil {
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return false, err
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}
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for _, a := range addrs {
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if ip, _, _ := net.ParseCIDR(a.String()); addr.Equal(ip) {
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return true, nil
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}
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}
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return false, nil
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}
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