63 lines
1.9 KiB
Go
63 lines
1.9 KiB
Go
// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package icmp
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import (
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"fmt"
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"net"
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)
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// In order for the icmpTuple to be used as hashtable key, it needs to have
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// a fixed size. This means the net.IP is problematic because it's internally
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// represented as a slice. Therefore the hashableIcmpTuple type is introduced
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// which internally is a simple byte array.
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const maxIcmpTupleRawSize = 1 + 16 + 16 + 2 + 2
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type hashableIcmpTuple [maxIcmpTupleRawSize]byte
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type icmpTuple struct {
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icmpVersion uint8
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srcIP net.IP
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dstIP net.IP
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id uint16
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seq uint16
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}
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func (t *icmpTuple) Reverse() icmpTuple {
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return icmpTuple{
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icmpVersion: t.icmpVersion,
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srcIP: t.dstIP,
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dstIP: t.srcIP,
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id: t.id,
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seq: t.seq,
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}
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}
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func (t *icmpTuple) Hashable() hashableIcmpTuple {
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var hash hashableIcmpTuple
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copy(hash[0:16], t.srcIP)
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copy(hash[16:32], t.dstIP)
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copy(hash[32:37], []byte{byte(t.id >> 8), byte(t.id), byte(t.seq >> 8), byte(t.seq), t.icmpVersion})
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return hash
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}
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func (t *icmpTuple) String() string {
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return fmt.Sprintf("icmpTuple version[%d] src[%s] dst[%s] id[%d] seq[%d]",
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t.icmpVersion, t.srcIP, t.dstIP, t.id, t.seq)
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}
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