/
nldeps_linux.go
146 lines (125 loc) · 3.92 KB
/
nldeps_linux.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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
// Copyright Istio Authors
//
// 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 ipset
import (
"errors"
"fmt"
"net"
"net/netip"
"github.com/vishvananda/netlink"
"github.com/vishvananda/netlink/nl"
"golang.org/x/sys/unix"
)
func RealNlDeps() NetlinkIpsetDeps {
return &realDeps{}
}
type realDeps struct{}
func (m *realDeps) ipsetIPHashCreate(name string, v6 bool) error {
var family uint8
if v6 {
family = unix.AF_INET6
} else {
family = unix.AF_INET
}
err := netlink.IpsetCreate(name, "hash:ip", netlink.IpsetCreateOptions{Comments: true, Replace: true, Family: family})
if ipsetErr, ok := err.(nl.IPSetError); ok && ipsetErr == nl.IPSET_ERR_EXIST {
return nil
}
return err
}
func (m *realDeps) destroySet(name string) error {
err := netlink.IpsetDestroy(name)
return err
}
func (m *realDeps) addIP(name string, ip netip.Addr, ipProto uint8, comment string, replace bool) error {
err := netlink.IpsetAdd(name, &netlink.IPSetEntry{
Comment: comment,
IP: net.IP(ip.AsSlice()),
Protocol: &ipProto,
Replace: replace,
})
if err != nil {
return fmt.Errorf("failed to add IP %s with and proto %d to ipset %s: %w", ip, ipProto, name, err)
}
return nil
}
func (m *realDeps) deleteIP(name string, ip netip.Addr, ipProto uint8) error {
err := netlink.IpsetDel(name, &netlink.IPSetEntry{
IP: net.IP(ip.AsSlice()),
Protocol: &ipProto,
})
if err != nil {
return fmt.Errorf("failed to delete IP %s with and proto %d from ipset %s: %w", ip, ipProto, name, err)
}
return nil
}
func (m *realDeps) flush(name string) error {
err := netlink.IpsetFlush(name)
if err != nil {
return fmt.Errorf("failed to flush ipset %s: %w", name, err)
}
return nil
}
// Alpine and some distros struggles with this - ipset CLI utilities support this, but
// the kernel can be out of sync with the CLI utility, leading to errors like:
//
// ipset v7.10: Argument `comment' is supported in the kernel module of the set type hash:ip
// starting from the revision 3 and you have installed revision 1 only.
// Your kernel is behind your ipset utility.
//
// This happens with kernels as recent as Fedora38, e.g: 6.4.11-200.fc38.aarch64
func (m *realDeps) clearEntriesWithComment(name, comment string) error {
res, err := netlink.IpsetList(name)
if err != nil {
return fmt.Errorf("failed to list ipset %s: %w", name, err)
}
for _, entry := range res.Entries {
if entry.Comment == comment {
err := netlink.IpsetDel(name, &entry)
if err != nil {
return fmt.Errorf("failed to delete IP %s from ipset %s: %w", entry.IP, name, err)
}
}
}
return nil
}
func (m *realDeps) clearEntriesWithIP(name string, ip netip.Addr) error {
delIP := net.IP(ip.AsSlice())
res, err := netlink.IpsetList(name)
if err != nil {
return fmt.Errorf("failed to list ipset %s: %w", name, err)
}
var delErrs []error
for _, entry := range res.Entries {
if entry.IP.Equal(delIP) {
err := netlink.IpsetDel(name, &entry)
if err != nil {
delErrs = append(delErrs, fmt.Errorf("failed to delete IP %s from ipset %s: %w", entry.IP, name, err))
}
}
}
return errors.Join(delErrs...)
}
func (m *realDeps) listEntriesByIP(name string) ([]netip.Addr, error) {
var ipList []netip.Addr
res, err := netlink.IpsetList(name)
if err != nil {
return ipList, fmt.Errorf("failed to list ipset %s: %w", name, err)
}
for _, entry := range res.Entries {
addr, _ := netip.AddrFromSlice(entry.IP)
ipList = append(ipList, addr)
}
return ipList, nil
}