forked from cilium/cilium
-
Notifications
You must be signed in to change notification settings - Fork 6
/
cidr.go
70 lines (64 loc) · 2.21 KB
/
cidr.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
// Copyright 2018 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 policy
import (
"net"
"github.com/cilium/cilium/pkg/ip"
"github.com/cilium/cilium/pkg/policy/api"
)
// getPrefixesFromCIDR fetches all CIDRs referred to by the specified slice
// and returns them as regular golang CIDR objects.
func getPrefixesFromCIDR(cidrs api.CIDRSlice) []*net.IPNet {
result, _ := ip.ParseCIDRs(cidrs.StringSlice())
return result
}
// GetPrefixesFromCIDRSet fetches all CIDRs referred to by the specified slice
// and returns them as regular golang CIDR objects.
//
// Assumes that validation already occurred on 'rules'.
func GetPrefixesFromCIDRSet(rules api.CIDRRuleSlice) []*net.IPNet {
cidrs := api.ComputeResultantCIDRSet(rules)
return getPrefixesFromCIDR(cidrs)
}
// GetCIDRPrefixes runs through the specified 'rules' to find every reference
// to a CIDR in the rules, and returns a slice containing all of these CIDRs.
// Multiple rules referring to the same CIDR will result in multiple copies of
// the CIDR in the returned slice.
//
// Assumes that validation already occurred on 'rules'.
func GetCIDRPrefixes(rules api.Rules) []*net.IPNet {
if len(rules) == 0 {
return nil
}
res := make([]*net.IPNet, 0, 32)
for _, r := range rules {
for _, ir := range r.Ingress {
if len(ir.FromCIDR) > 0 {
res = append(res, getPrefixesFromCIDR(ir.FromCIDR)...)
}
if len(ir.FromCIDRSet) > 0 {
res = append(res, GetPrefixesFromCIDRSet(ir.FromCIDRSet)...)
}
}
for _, er := range r.Egress {
if len(er.ToCIDR) > 0 {
res = append(res, getPrefixesFromCIDR(er.ToCIDR)...)
}
if len(er.ToCIDRSet) > 0 {
res = append(res, GetPrefixesFromCIDRSet(er.ToCIDRSet)...)
}
}
}
return res
}