51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
// Package ipamutils provides utility functions for ipam management
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package ipamutils
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import (
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"net"
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"sync"
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)
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var (
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// PredefinedBroadNetworks contains a list of 31 IPv4 private networks with host size 16 and 12
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// (172.17-31.x.x/16, 192.168.x.x/20) which do not overlap with the networks in `PredefinedGranularNetworks`
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PredefinedBroadNetworks []*net.IPNet
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// PredefinedGranularNetworks contains a list of 64K IPv4 private networks with host size 8
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// (10.x.x.x/24) which do not overlap with the networks in `PredefinedBroadNetworks`
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PredefinedGranularNetworks []*net.IPNet
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initNetworksOnce sync.Once
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)
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// InitNetworks initializes the pre-defined networks used by the built-in IP allocator
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func InitNetworks() {
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initNetworksOnce.Do(func() {
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PredefinedBroadNetworks = initBroadPredefinedNetworks()
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PredefinedGranularNetworks = initGranularPredefinedNetworks()
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})
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}
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func initBroadPredefinedNetworks() []*net.IPNet {
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pl := make([]*net.IPNet, 0, 31)
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mask := []byte{255, 255, 0, 0}
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for i := 17; i < 32; i++ {
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pl = append(pl, &net.IPNet{IP: []byte{172, byte(i), 0, 0}, Mask: mask})
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}
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mask20 := []byte{255, 255, 240, 0}
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for i := 0; i < 16; i++ {
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pl = append(pl, &net.IPNet{IP: []byte{192, 168, byte(i << 4), 0}, Mask: mask20})
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}
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return pl
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}
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func initGranularPredefinedNetworks() []*net.IPNet {
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pl := make([]*net.IPNet, 0, 256*256)
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mask := []byte{255, 255, 255, 0}
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for i := 0; i < 256; i++ {
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for j := 0; j < 256; j++ {
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pl = append(pl, &net.IPNet{IP: []byte{10, byte(i), byte(j), 0}, Mask: mask})
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}
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}
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return pl
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}
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