-
Notifications
You must be signed in to change notification settings - Fork 2.8k
/
eventsmap.go
81 lines (68 loc) · 2.29 KB
/
eventsmap.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
// Copyright 2020 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 eventsmap
import (
"fmt"
"unsafe"
"github.com/cilium/cilium/pkg/bpf"
"github.com/cilium/cilium/pkg/common"
"github.com/cilium/cilium/pkg/logging"
"github.com/cilium/cilium/pkg/logging/logfields"
)
var (
log = logging.DefaultLogger.WithField(logfields.LogSubsys, "map-events")
)
const (
// MapName is the BPF map name.
MapName = "cilium_events"
)
// Key is the index into the prog array map.
// +k8s:deepcopy-gen=true
// +k8s:deepcopy-gen:interfaces=github.com/cilium/cilium/pkg/bpf.MapKey
type Key struct {
index uint32
}
// Value is the program ID in the prog array map.
// +k8s:deepcopy-gen=true
// +k8s:deepcopy-gen:interfaces=github.com/cilium/cilium/pkg/bpf.MapValue
type Value struct {
progID uint32
}
// GetKeyPtr returns the unsafe pointer to the BPF key
func (k *Key) GetKeyPtr() unsafe.Pointer { return unsafe.Pointer(k) }
// GetValuePtr returns the unsafe pointer to the BPF value
func (v *Value) GetValuePtr() unsafe.Pointer { return unsafe.Pointer(v) }
// String converts the key into a human readable string format.
func (k *Key) String() string { return fmt.Sprintf("%d", k.index) }
// String converts the value into a human readable string format.
func (v *Value) String() string { return fmt.Sprintf("%d", v.progID) }
// NewValue returns a new empty instance of the structure representing the BPF
// map value.
func (k Key) NewValue() bpf.MapValue { return &Value{} }
// InitMap creates the events map in the kernel.
func InitMap() error {
eventsMap := bpf.NewMap(MapName,
bpf.MapTypePerfEventArray,
&Key{},
int(unsafe.Sizeof(Key{})),
&Value{},
int(unsafe.Sizeof(Value{})),
common.GetNumPossibleCPUs(log),
0,
0,
bpf.ConvertKeyValue,
)
_, err := eventsMap.Create()
return err
}