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node.go
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node.go
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// Copyright 2021 Antrea Authors
//
// 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 k8s
import (
"fmt"
"net"
v1 "k8s.io/api/core/v1"
"antrea.io/antrea/pkg/util/ip"
)
// GetNodeAddrs gets the available IP addresses of a Node. GetNodeAddrs will first try to get the NodeInternalIP, then try
// to get the NodeExternalIP.
// If no error is returned, the returned DualStackIPs includes at least one IPv4 or IPv6 address.
func GetNodeAddrs(node *v1.Node) (*ip.DualStackIPs, error) {
addresses := make(map[v1.NodeAddressType][]string)
for _, addr := range node.Status.Addresses {
addresses[addr.Type] = append(addresses[addr.Type], addr.Address)
}
var ipAddrStrs []string
if internalIP, ok := addresses[v1.NodeInternalIP]; ok {
ipAddrStrs = internalIP
} else if externalIP, ok := addresses[v1.NodeExternalIP]; ok {
ipAddrStrs = externalIP
} else {
return nil, fmt.Errorf("Node %s has neither external ip nor internal ip", node.Name)
}
if len(ipAddrStrs) == 0 {
return nil, fmt.Errorf("no IP is found for Node '%s'", node.Name)
}
nodeAddrs := new(ip.DualStackIPs)
for i := range ipAddrStrs {
addr := net.ParseIP(ipAddrStrs[i])
if addr == nil {
return nil, fmt.Errorf("'%s' is not a valid IP address", ipAddrStrs[i])
}
if addr.To4() == nil {
nodeAddrs.IPv6 = addr
} else {
nodeAddrs.IPv4 = addr
}
}
return nodeAddrs, nil
}