1 // Package ipamutils provides utility functions for ipam management
10 // PredefinedBroadNetworks contains a list of 31 IPv4 private networks with host size 16 and 12
11 // (172.17-31.x.x/16, 192.168.x.x/20) which do not overlap with the networks in `PredefinedGranularNetworks`
12 PredefinedBroadNetworks []*net.IPNet
13 // PredefinedGranularNetworks contains a list of 64K IPv4 private networks with host size 8
14 // (10.x.x.x/24) which do not overlap with the networks in `PredefinedBroadNetworks`
15 PredefinedGranularNetworks []*net.IPNet
17 initNetworksOnce sync.Once
20 // InitNetworks initializes the pre-defined networks used by the built-in IP allocator
22 initNetworksOnce.Do(func() {
23 PredefinedBroadNetworks = initBroadPredefinedNetworks()
24 PredefinedGranularNetworks = initGranularPredefinedNetworks()
28 func initBroadPredefinedNetworks() []*net.IPNet {
29 pl := make([]*net.IPNet, 0, 31)
30 mask := []byte{255, 255, 0, 0}
31 for i := 17; i < 32; i++ {
32 pl = append(pl, &net.IPNet{IP: []byte{172, byte(i), 0, 0}, Mask: mask})
34 mask20 := []byte{255, 255, 240, 0}
35 for i := 0; i < 16; i++ {
36 pl = append(pl, &net.IPNet{IP: []byte{192, 168, byte(i << 4), 0}, Mask: mask20})
41 func initGranularPredefinedNetworks() []*net.IPNet {
42 pl := make([]*net.IPNet, 0, 256*256)
43 mask := []byte{255, 255, 255, 0}
44 for i := 0; i < 256; i++ {
45 for j := 0; j < 256; j++ {
46 pl = append(pl, &net.IPNet{IP: []byte{10, byte(i), byte(j), 0}, Mask: mask})