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encrypt.go
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encrypt.go
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// Copyright 2018-2019 Authors of Cilium
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package encrypt
import (
"fmt"
"sync"
"unsafe"
"github.com/cilium/cilium/pkg/bpf"
)
// EncryptKey is the context ID for the encryption session
// +k8s:deepcopy-gen=true
// +k8s:deepcopy-gen:interfaces=github.com/cilium/cilium/pkg/bpf.MapKey
type EncryptKey struct {
key uint32 `align:"ctx"`
}
// EncryptValue is ID assigned to the keys
// +k8s:deepcopy-gen=true
// +k8s:deepcopy-gen:interfaces=github.com/cilium/cilium/pkg/bpf.MapValue
type EncryptValue struct {
encryptKeyID uint8
}
// String pretty print the EncryptKey
func (k EncryptKey) String() string {
return fmt.Sprintf("%d", k.key)
}
// String pretty print the encryption key index.
func (v EncryptValue) String() string {
return fmt.Sprintf("%d", v.encryptKeyID)
}
// GetValuePtr returns the unsafe pointer to the BPF value.
func (v *EncryptValue) GetValuePtr() unsafe.Pointer { return unsafe.Pointer(v) }
// GetKeyPtr returns the unsafe pointer to the BPF key
func (k *EncryptKey) GetKeyPtr() unsafe.Pointer { return unsafe.Pointer(k) }
// NewValue returns a new empty instance of the structure represeting the BPF
// map value
func (k EncryptKey) NewValue() bpf.MapValue { return &EncryptValue{} }
func newEncryptKey(key uint32) *EncryptKey {
return &EncryptKey{
key: key,
}
}
const (
// MapName name of map used to pin map for datapath
MapName = "cilium_encrypt_state"
// MaxEntries represents the maximum number of current encryption contexts
MaxEntries = 1
)
var (
once sync.Once
encryptMap *bpf.Map
)
// MapCreate will create an encrypt map
func MapCreate() error {
once.Do(func() {
encryptMap = bpf.NewMap(MapName,
bpf.MapTypeArray,
&EncryptKey{},
int(unsafe.Sizeof(EncryptKey{})),
&EncryptValue{},
int(unsafe.Sizeof(EncryptValue{})),
MaxEntries,
0, 0,
bpf.ConvertKeyValue,
).WithCache()
})
_, err := encryptMap.OpenOrCreate()
return err
}
// MapUpdateContext updates the encrypt state with ctxID to use the new keyID
func MapUpdateContext(ctxID uint32, keyID uint8) error {
k := newEncryptKey(ctxID)
v := &EncryptValue{
encryptKeyID: keyID,
}
return encryptMap.Update(k, v)
}