forked from openshift/origin
-
Notifications
You must be signed in to change notification settings - Fork 1
/
sdn_controller.go
229 lines (199 loc) · 6.89 KB
/
sdn_controller.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
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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
package plugin
import (
"fmt"
"net"
"strings"
"time"
"github.com/golang/glog"
osapi "github.com/openshift/origin/pkg/sdn/apis/network"
"github.com/openshift/origin/pkg/util/ipcmd"
"github.com/openshift/origin/pkg/util/netutils"
kapierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilwait "k8s.io/apimachinery/pkg/util/wait"
kapi "k8s.io/kubernetes/pkg/api"
utildbus "k8s.io/kubernetes/pkg/util/dbus"
kexec "k8s.io/kubernetes/pkg/util/exec"
"k8s.io/kubernetes/pkg/util/iptables"
"k8s.io/kubernetes/pkg/util/sysctl"
)
func (plugin *OsdnNode) getLocalSubnet() (string, error) {
var subnet *osapi.HostSubnet
// If the HostSubnet doesn't already exist, it will be created by the SDN master in
// response to the kubelet registering itself with the master (which should be
// happening in another goroutine in parallel with this). Sometimes this takes
// unexpectedly long though, so give it plenty of time before returning an error
// (since that will cause the node process to exit).
backoff := utilwait.Backoff{
// A bit over 1 minute total
Duration: time.Second,
Factor: 1.5,
Steps: 8,
}
err := utilwait.ExponentialBackoff(backoff, func() (bool, error) {
var err error
subnet, err = plugin.osClient.HostSubnets().Get(plugin.hostName, metav1.GetOptions{})
if err == nil {
return true, nil
} else if kapierrors.IsNotFound(err) {
glog.Warningf("Could not find an allocated subnet for node: %s, Waiting...", plugin.hostName)
return false, nil
} else {
return false, err
}
})
if err != nil {
return "", fmt.Errorf("failed to get subnet for this host: %s, error: %v", plugin.hostName, err)
}
if err = plugin.networkInfo.validateNodeIP(subnet.HostIP); err != nil {
return "", fmt.Errorf("failed to validate own HostSubnet: %v", err)
}
return subnet.Subnet, nil
}
func (plugin *OsdnNode) alreadySetUp(localSubnetGatewayCIDR, clusterNetworkCIDR string) bool {
var found bool
exec := kexec.New()
itx := ipcmd.NewTransaction(exec, Tun0)
addrs, err := itx.GetAddresses()
itx.EndTransaction()
if err != nil {
return false
}
found = false
for _, addr := range addrs {
if strings.Contains(addr, localSubnetGatewayCIDR) {
found = true
break
}
}
if !found {
return false
}
itx = ipcmd.NewTransaction(exec, Tun0)
routes, err := itx.GetRoutes()
itx.EndTransaction()
if err != nil {
return false
}
found = false
for _, route := range routes {
if strings.Contains(route, clusterNetworkCIDR+" ") {
found = true
break
}
}
if !found {
return false
}
if !plugin.oc.AlreadySetUp() {
return false
}
return true
}
func deleteLocalSubnetRoute(device, localSubnetCIDR string) {
backoff := utilwait.Backoff{
Duration: 100 * time.Millisecond,
Factor: 1.25,
Steps: 6,
}
err := utilwait.ExponentialBackoff(backoff, func() (bool, error) {
itx := ipcmd.NewTransaction(kexec.New(), device)
routes, err := itx.GetRoutes()
if err != nil {
return false, fmt.Errorf("could not get routes: %v", err)
}
for _, route := range routes {
if strings.Contains(route, localSubnetCIDR) {
itx.DeleteRoute(localSubnetCIDR)
err = itx.EndTransaction()
if err != nil {
return false, fmt.Errorf("could not delete route: %v", err)
}
return true, nil
}
}
return false, nil
})
if err != nil {
glog.Errorf("Error removing %s route from dev %s: %v; if the route appears later it will not be deleted.", localSubnetCIDR, device, err)
}
}
func (plugin *OsdnNode) SetupSDN() (bool, error) {
clusterNetworkCIDR := plugin.networkInfo.ClusterNetwork.String()
serviceNetworkCIDR := plugin.networkInfo.ServiceNetwork.String()
localSubnetCIDR := plugin.localSubnetCIDR
_, ipnet, err := net.ParseCIDR(localSubnetCIDR)
localSubnetMaskLength, _ := ipnet.Mask.Size()
localSubnetGateway := netutils.GenerateDefaultGateway(ipnet).String()
glog.V(5).Infof("[SDN setup] node pod subnet %s gateway %s", ipnet.String(), localSubnetGateway)
exec := kexec.New()
if plugin.clearLbr0IptablesRule {
// Delete docker's left-over lbr0 rule; cannot do this from
// NewNodePlugin (where docker is cleaned up) because we need
// localSubnetCIDR which is only valid after plugin start
ipt := iptables.New(exec, utildbus.New(), iptables.ProtocolIpv4)
ipt.DeleteRule(iptables.TableNAT, iptables.ChainPostrouting, "-s", localSubnetCIDR, "!", "-o", "lbr0", "-j", "MASQUERADE")
}
gwCIDR := fmt.Sprintf("%s/%d", localSubnetGateway, localSubnetMaskLength)
if plugin.alreadySetUp(gwCIDR, clusterNetworkCIDR) {
glog.V(5).Infof("[SDN setup] no SDN setup required")
return false, nil
}
glog.V(5).Infof("[SDN setup] full SDN setup required")
err = plugin.oc.SetupOVS(clusterNetworkCIDR, serviceNetworkCIDR, localSubnetCIDR, localSubnetGateway, plugin.localIP)
if err != nil {
return false, err
}
itx := ipcmd.NewTransaction(exec, Tun0)
itx.AddAddress(gwCIDR)
defer deleteLocalSubnetRoute(Tun0, localSubnetCIDR)
itx.SetLink("mtu", fmt.Sprint(plugin.mtu))
itx.SetLink("up")
itx.AddRoute(clusterNetworkCIDR, "proto", "kernel", "scope", "link")
itx.AddRoute(serviceNetworkCIDR)
err = itx.EndTransaction()
if err != nil {
return false, err
}
sysctl := sysctl.New()
// Make sure IPv4 forwarding state is 1
val, err := sysctl.GetSysctl("net/ipv4/ip_forward")
if err != nil {
return false, fmt.Errorf("could not get IPv4 forwarding state: %s", err)
}
if val != 1 {
return false, fmt.Errorf("net/ipv4/ip_forward=0, it must be set to 1")
}
return true, nil
}
func (plugin *OsdnNode) updateEgressNetworkPolicyRules(vnid uint32) {
policies := plugin.egressPolicies[vnid]
namespaces := plugin.policy.GetNamespaces(vnid)
if err := plugin.oc.UpdateEgressNetworkPolicyRules(policies, vnid, namespaces, plugin.egressDNS); err != nil {
glog.Errorf("Error updating OVS flows for EgressNetworkPolicy: %v", err)
}
}
func (plugin *OsdnNode) AddHostSubnetRules(subnet *osapi.HostSubnet) {
glog.Infof("AddHostSubnetRules for %s", hostSubnetToString(subnet))
if err := plugin.oc.AddHostSubnetRules(subnet); err != nil {
glog.Errorf("Error adding OVS flows for subnet %q: %v", subnet.Subnet, err)
}
}
func (plugin *OsdnNode) DeleteHostSubnetRules(subnet *osapi.HostSubnet) {
glog.Infof("DeleteHostSubnetRules for %s", hostSubnetToString(subnet))
if err := plugin.oc.DeleteHostSubnetRules(subnet); err != nil {
glog.Errorf("Error deleting OVS flows for subnet %q: %v", subnet.Subnet, err)
}
}
func (plugin *OsdnNode) AddServiceRules(service *kapi.Service, netID uint32) {
glog.V(5).Infof("AddServiceRules for %v", service)
if err := plugin.oc.AddServiceRules(service, netID); err != nil {
glog.Errorf("Error adding OVS flows for service %v, netid %d: %v", service, netID, err)
}
}
func (plugin *OsdnNode) DeleteServiceRules(service *kapi.Service) {
glog.V(5).Infof("DeleteServiceRules for %v", service)
if err := plugin.oc.DeleteServiceRules(service); err != nil {
glog.Errorf("Error deleting OVS flows for service %v: %v", service, err)
}
}