github.com/fafucoder/cilium@v1.6.11/pkg/ip/ip_linux.go (about)

     1  // Copyright 2017-2019 Authors of Cilium
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ip
    16  
    17  import (
    18  	"strings"
    19  
    20  	"github.com/vishvananda/netlink"
    21  )
    22  
    23  func initExcludedIPs() {
    24  	// We exclude below bad device prefixes from address selection ...
    25  	prefixes := []string{
    26  		"docker",
    27  	}
    28  	links, err := netlink.LinkList()
    29  	if err != nil {
    30  		return
    31  	}
    32  	for _, l := range links {
    33  		// ... also all down devices since they won't be reachable.
    34  		if l.Attrs().OperState == netlink.OperUp {
    35  			skip := true
    36  			for _, p := range prefixes {
    37  				if strings.HasPrefix(l.Attrs().Name, p) {
    38  					skip = false
    39  					break
    40  				}
    41  			}
    42  			if skip {
    43  				continue
    44  			}
    45  		}
    46  		addr, err := netlink.AddrList(l, netlink.FAMILY_ALL)
    47  		if err != nil {
    48  			continue
    49  		}
    50  		for _, a := range addr {
    51  			excludedIPs = append(excludedIPs, a.IP)
    52  		}
    53  	}
    54  }