mirror of https://github.com/k3s-io/k3s
Merge pull request #4265 from manuelbuil/update_flannel_1.22
[Release-1.22] Update to the newest flannelpull/4281/head
Manuel Buil
3 years ago
committed by
GitHub
commit
61084d6120
@ -0,0 +1,35 @@
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// Copyright 2021 flannel authors
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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 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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package mac
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import (
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"crypto/rand"
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"fmt"
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"net"
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)
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// NewHardwareAddr generates a new random hardware (MAC) address, local and
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// unicast.
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func NewHardwareAddr() (net.HardwareAddr, error) {
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hardwareAddr := make(net.HardwareAddr, 6)
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if _, err := rand.Read(hardwareAddr); err != nil {
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return nil, fmt.Errorf("could not generate random MAC address: %w", err)
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}
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// Ensure that address is locally administered and unicast.
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hardwareAddr[0] = (hardwareAddr[0] & 0xfe) | 0x02
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return hardwareAddr, nil
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}
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