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ipmasq.go
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ipmasq.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package ipmasq
import (
"fmt"
"net"
"unsafe"
"github.com/cilium/cilium/pkg/bpf"
"github.com/cilium/cilium/pkg/types"
)
const (
MapName = "cilium_ipmasq_v4"
MaxEntries = 16384
)
// +k8s:deepcopy-gen=true
// +k8s:deepcopy-gen:interfaces=github.com/cilium/cilium/pkg/bpf.MapKey
type Key4 struct {
PrefixLen uint32
Address types.IPv4
}
func (k *Key4) GetKeyPtr() unsafe.Pointer { return unsafe.Pointer(k) }
func (k *Key4) NewValue() bpf.MapValue { return &Value{} }
func (k *Key4) String() string { return fmt.Sprintf("%s", k.Address) }
// +k8s:deepcopy-gen=true
// +k8s:deepcopy-gen:interfaces=github.com/cilium/cilium/pkg/bpf.MapValue
type Value struct {
Pad uint8 // not used
}
func (v *Value) GetValuePtr() unsafe.Pointer { return unsafe.Pointer(v) }
func (v *Value) String() string { return "" }
var IPMasq4Map = bpf.NewMap(
MapName,
bpf.MapTypeLPMTrie,
&Key4{}, int(unsafe.Sizeof(Key4{})),
&Value{}, int(unsafe.Sizeof(Value{})),
MaxEntries,
bpf.BPF_F_NO_PREALLOC, 0,
bpf.ConvertKeyValue,
).WithCache().WithPressureMetric()
type IPMasqBPFMap struct{}
func (*IPMasqBPFMap) Update(cidr net.IPNet) error {
return IPMasq4Map.Update(key(cidr), &Value{})
}
func (*IPMasqBPFMap) Delete(cidr net.IPNet) error {
return IPMasq4Map.Delete(key(cidr))
}
func (*IPMasqBPFMap) Dump() ([]net.IPNet, error) {
cidrs := []net.IPNet{}
if err := IPMasq4Map.DumpWithCallback(
func(key bpf.MapKey, value bpf.MapValue) {
cidrs = append(cidrs, keyToIPNet(key.(*Key4)))
}); err != nil {
return nil, err
}
return cidrs, nil
}
func key(cidr net.IPNet) *Key4 {
ones, _ := cidr.Mask.Size()
key := &Key4{PrefixLen: uint32(ones)}
copy(key.Address[:], cidr.IP.To4())
return key
}
func keyToIPNet(key *Key4) net.IPNet {
var (
cidr net.IPNet
ip types.IPv4
)
cidr.Mask = net.CIDRMask(int(key.PrefixLen), 32)
key.Address.DeepCopyInto(&ip)
cidr.IP = ip.IP()
return cidr
}