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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
// Copyright 2017 CNI 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 main
import (
"encoding/json"
"fmt"
"runtime"
"strings"
"github.com/Microsoft/hcsshim"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/types"
current "github.com/containernetworking/cni/pkg/types/100"
"github.com/containernetworking/cni/pkg/version"
"github.com/containernetworking/plugins/pkg/errors"
"github.com/containernetworking/plugins/pkg/hns"
"github.com/containernetworking/plugins/pkg/ipam"
bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
)
type NetConf struct {
hns.NetConf
IPMasq bool `json:"ipMasq"`
EndpointMacPrefix string `json:"endpointMacPrefix,omitempty"`
}
func init() {
// this ensures that main runs only on main thread (thread group leader).
// since namespace ops (unshare, setns) are done for a single thread, we
// must ensure that the goroutine does not jump from OS thread to thread
runtime.LockOSThread()
}
func loadNetConf(bytes []byte) (*NetConf, string, error) {
n := &NetConf{}
if err := json.Unmarshal(bytes, n); err != nil {
return nil, "", fmt.Errorf("failed to load netconf: %v", err)
}
return n, n.CNIVersion, nil
}
func cmdAdd(args *skel.CmdArgs) error {
success := false
n, cniVersion, err := loadNetConf(args.StdinData)
if err != nil {
return errors.Annotate(err, "error while loadNetConf")
}
if len(n.EndpointMacPrefix) != 0 {
if len(n.EndpointMacPrefix) != 5 || n.EndpointMacPrefix[2] != '-' {
return fmt.Errorf("endpointMacPrefix [%v] is invalid, value must be of the format xx-xx", n.EndpointMacPrefix)
}
} else {
n.EndpointMacPrefix = "0E-2A"
}
networkName := n.Name
hnsNetwork, err := hcsshim.GetHNSNetworkByName(networkName)
if err != nil {
return errors.Annotatef(err, "error while GETHNSNewtorkByName(%s)", networkName)
}
if hnsNetwork == nil {
return fmt.Errorf("network %v not found", networkName)
}
if !strings.EqualFold(hnsNetwork.Type, "Overlay") {
return fmt.Errorf("network %v is of an unexpected type: %v", networkName, hnsNetwork.Type)
}
epName := hns.ConstructEndpointName(args.ContainerID, args.Netns, n.Name)
hnsEndpoint, err := hns.AddHnsEndpoint(epName, hnsNetwork.Id, args.ContainerID, args.Netns, func() (*hcsshim.HNSEndpoint, error) {
// run the IPAM plugin and get back the config to apply
r, err := ipam.ExecAdd(n.IPAM.Type, args.StdinData)
if err != nil {
return nil, errors.Annotatef(err, "error while ipam.ExecAdd")
}
// Convert whatever the IPAM result was into the current Result type
result, err := current.NewResultFromResult(r)
if err != nil {
return nil, errors.Annotatef(err, "error while NewResultFromResult")
}
if len(result.IPs) == 0 {
return nil, fmt.Errorf("IPAM plugin return is missing IP config")
}
ipAddr := result.IPs[0].Address.IP.To4()
if ipAddr == nil {
return nil, fmt.Errorf("win-overlay doesn't support IPv6 now")
}
// conjure a MAC based on the IP for Overlay
macAddr := fmt.Sprintf("%v-%02x-%02x-%02x-%02x", n.EndpointMacPrefix, ipAddr[0], ipAddr[1], ipAddr[2], ipAddr[3])
// use the HNS network gateway
gw := hnsNetwork.Subnets[0].GatewayAddress
n.ApplyDefaultPAPolicy(hnsNetwork.ManagementIP)
if n.IPMasq {
n.ApplyOutboundNatPolicy(hnsNetwork.Subnets[0].AddressPrefix)
}
result.DNS = n.GetDNS()
if n.LoopbackDSR {
n.ApplyLoopbackDSRPolicy(&ipAddr)
}
hnsEndpoint := &hcsshim.HNSEndpoint{
Name: epName,
VirtualNetwork: hnsNetwork.Id,
DNSServerList: strings.Join(result.DNS.Nameservers, ","),
DNSSuffix: strings.Join(result.DNS.Search, ","),
GatewayAddress: gw,
IPAddress: ipAddr,
MacAddress: macAddr,
Policies: n.GetHNSEndpointPolicies(),
}
return hnsEndpoint, nil
})
defer func() {
if !success {
ipam.ExecDel(n.IPAM.Type, args.StdinData)
}
}()
if err != nil {
return errors.Annotatef(err, "error while AddHnsEndpoint(%v,%v,%v)", epName, hnsNetwork.Id, args.ContainerID)
}
result, err := hns.ConstructHnsResult(hnsNetwork, hnsEndpoint)
if err != nil {
return errors.Annotatef(err, "error while constructResult")
}
success = true
return types.PrintResult(result, cniVersion)
}
func cmdDel(args *skel.CmdArgs) error {
n, _, err := loadNetConf(args.StdinData)
if err != nil {
return err
}
if err := ipam.ExecDel(n.IPAM.Type, args.StdinData); err != nil {
return err
}
epName := hns.ConstructEndpointName(args.ContainerID, args.Netns, n.Name)
return hns.RemoveHnsEndpoint(epName, args.Netns, args.ContainerID)
}
func cmdCheck(_ *skel.CmdArgs) error {
// TODO: implement
return nil
}
func main() {
skel.PluginMain(cmdAdd, cmdCheck, cmdDel, version.All, bv.BuildString("win-overlay"))
}
|
