e8011d7872
ConfigLocalScopeDefaultNetworks is now dead code, thank goodness! Make sure it stays dead by deleting the function. Refactor package ipamutils to simplify things given its newly-reduced (ahem) scope. Signed-off-by: Cory Snider <csnider@mirantis.com>
117 lines
3.8 KiB
Go
117 lines
3.8 KiB
Go
// Package ipamutils provides utility functions for ipam management
|
|
package ipamutils
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"sync"
|
|
)
|
|
|
|
var (
|
|
// predefinedLocalScopeDefaultNetworks contains a list of 31 IPv4 private networks with host size 16 and 12
|
|
// (172.17-31.x.x/16, 192.168.x.x/20) which do not overlap with the networks in `PredefinedGlobalScopeDefaultNetworks`
|
|
predefinedLocalScopeDefaultNetworks []*net.IPNet
|
|
// predefinedGlobalScopeDefaultNetworks contains a list of 64K IPv4 private networks with host size 8
|
|
// (10.x.x.x/24) which do not overlap with the networks in `PredefinedLocalScopeDefaultNetworks`
|
|
predefinedGlobalScopeDefaultNetworks []*net.IPNet
|
|
mutex sync.Mutex
|
|
localScopeDefaultNetworks = []*NetworkToSplit{{"172.17.0.0/16", 16}, {"172.18.0.0/16", 16}, {"172.19.0.0/16", 16},
|
|
{"172.20.0.0/14", 16}, {"172.24.0.0/14", 16}, {"172.28.0.0/14", 16},
|
|
{"192.168.0.0/16", 20}}
|
|
globalScopeDefaultNetworks = []*NetworkToSplit{{"10.0.0.0/8", 24}}
|
|
)
|
|
|
|
// NetworkToSplit represent a network that has to be split in chunks with mask length Size.
|
|
// Each subnet in the set is derived from the Base pool. Base is to be passed
|
|
// in CIDR format.
|
|
// Example: a Base "10.10.0.0/16 with Size 24 will define the set of 256
|
|
// 10.10.[0-255].0/24 address pools
|
|
type NetworkToSplit struct {
|
|
Base string `json:"base"`
|
|
Size int `json:"size"`
|
|
}
|
|
|
|
func init() {
|
|
var err error
|
|
if predefinedGlobalScopeDefaultNetworks, err = SplitNetworks(globalScopeDefaultNetworks); err != nil {
|
|
panic("failed to initialize the global scope default address pool: " + err.Error())
|
|
}
|
|
|
|
if predefinedLocalScopeDefaultNetworks, err = SplitNetworks(localScopeDefaultNetworks); err != nil {
|
|
panic("failed to initialize the local scope default address pool: " + err.Error())
|
|
}
|
|
}
|
|
|
|
// ConfigGlobalScopeDefaultNetworks configures global default pool.
|
|
// Ideally this will be called from SwarmKit as part of swarm init
|
|
func ConfigGlobalScopeDefaultNetworks(defaultAddressPool []*NetworkToSplit) error {
|
|
if defaultAddressPool == nil {
|
|
return nil
|
|
}
|
|
mutex.Lock()
|
|
defer mutex.Unlock()
|
|
defaultNetworks, err := SplitNetworks(defaultAddressPool)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
predefinedGlobalScopeDefaultNetworks = defaultNetworks
|
|
return nil
|
|
}
|
|
|
|
// GetGlobalScopeDefaultNetworks returns a copy of the global-sopce network list.
|
|
func GetGlobalScopeDefaultNetworks() []*net.IPNet {
|
|
mutex.Lock()
|
|
defer mutex.Unlock()
|
|
return append([]*net.IPNet(nil), predefinedGlobalScopeDefaultNetworks...)
|
|
}
|
|
|
|
// GetLocalScopeDefaultNetworks returns a copy of the default local-scope network list.
|
|
func GetLocalScopeDefaultNetworks() []*net.IPNet {
|
|
return append([]*net.IPNet(nil), predefinedLocalScopeDefaultNetworks...)
|
|
}
|
|
|
|
// SplitNetworks takes a slice of networks, split them accordingly and returns them
|
|
func SplitNetworks(list []*NetworkToSplit) ([]*net.IPNet, error) {
|
|
localPools := make([]*net.IPNet, 0, len(list))
|
|
|
|
for _, p := range list {
|
|
_, b, err := net.ParseCIDR(p.Base)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("invalid base pool %q: %v", p.Base, err)
|
|
}
|
|
ones, _ := b.Mask.Size()
|
|
if p.Size <= 0 || p.Size < ones {
|
|
return nil, fmt.Errorf("invalid pools size: %d", p.Size)
|
|
}
|
|
localPools = append(localPools, splitNetwork(p.Size, b)...)
|
|
}
|
|
return localPools, nil
|
|
}
|
|
|
|
func splitNetwork(size int, base *net.IPNet) []*net.IPNet {
|
|
one, bits := base.Mask.Size()
|
|
mask := net.CIDRMask(size, bits)
|
|
n := 1 << uint(size-one)
|
|
s := uint(bits - size)
|
|
list := make([]*net.IPNet, 0, n)
|
|
|
|
for i := 0; i < n; i++ {
|
|
ip := copyIP(base.IP)
|
|
addIntToIP(ip, uint(i<<s))
|
|
list = append(list, &net.IPNet{IP: ip, Mask: mask})
|
|
}
|
|
return list
|
|
}
|
|
|
|
func copyIP(from net.IP) net.IP {
|
|
ip := make([]byte, len(from))
|
|
copy(ip, from)
|
|
return ip
|
|
}
|
|
|
|
func addIntToIP(array net.IP, ordinal uint) {
|
|
for i := len(array) - 1; i >= 0; i-- {
|
|
array[i] |= (byte)(ordinal & 0xff)
|
|
ordinal >>= 8
|
|
}
|
|
}
|