-
Notifications
You must be signed in to change notification settings - Fork 4.7k
/
ovscontroller.go
633 lines (544 loc) · 23.7 KB
/
ovscontroller.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
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
package plugin
import (
"encoding/hex"
"fmt"
"net"
"sort"
"strconv"
"strings"
"github.com/golang/glog"
osapi "github.com/openshift/origin/pkg/sdn/apis/network"
"github.com/openshift/origin/pkg/util/ovs"
"k8s.io/apimachinery/pkg/util/sets"
kapi "k8s.io/kubernetes/pkg/api"
)
type ovsController struct {
ovs ovs.Interface
pluginId int
useConnTrack bool
}
const (
BR = "br0"
TUN = "tun0"
VXLAN = "vxlan0"
// rule versioning; increment each time flow rules change
VERSION = 4
VERSION_TABLE = 253
)
func NewOVSController(ovsif ovs.Interface, pluginId int, useConnTrack bool) *ovsController {
return &ovsController{ovs: ovsif, pluginId: pluginId, useConnTrack: useConnTrack}
}
func (oc *ovsController) getVersionNote() string {
if VERSION > 254 {
panic("Version too large!")
}
return fmt.Sprintf("%02X.%02X", oc.pluginId, VERSION)
}
func (oc *ovsController) AlreadySetUp() bool {
flows, err := oc.ovs.DumpFlows()
if err != nil {
return false
}
expectedVersionNote := oc.getVersionNote()
for _, flow := range flows {
parsed, err := ovs.ParseFlow(ovs.ParseForDump, flow)
if err == nil && parsed.Table == VERSION_TABLE && parsed.NoteHasPrefix(expectedVersionNote) {
return true
}
}
return false
}
func (oc *ovsController) SetupOVS(clusterNetworkCIDR, serviceNetworkCIDR, localSubnetCIDR, localSubnetGateway, nodeIP string) error {
err := oc.ovs.AddBridge("fail-mode=secure", "protocols=OpenFlow13")
if err != nil {
return err
}
err = oc.ovs.SetFrags("nx-match")
if err != nil {
return err
}
_ = oc.ovs.DeletePort(VXLAN)
_, err = oc.ovs.AddPort(VXLAN, 1, "type=vxlan", `options:remote_ip="flow"`, `options:key="flow"`)
if err != nil {
return err
}
_ = oc.ovs.DeletePort(TUN)
_, err = oc.ovs.AddPort(TUN, 2, "type=internal")
if err != nil {
return err
}
otx := oc.ovs.NewTransaction()
// Table 0: initial dispatch based on in_port
if oc.useConnTrack {
otx.AddFlow("table=0, priority=300, ip, ct_state=-trk, actions=ct(table=0)")
}
// vxlan0
otx.AddFlow("table=0, priority=200, in_port=1, arp, nw_src=%s, nw_dst=%s, actions=move:NXM_NX_TUN_ID[0..31]->NXM_NX_REG0[],goto_table:10", clusterNetworkCIDR, localSubnetCIDR)
otx.AddFlow("table=0, priority=200, in_port=1, ip, nw_src=%s, nw_dst=%s, actions=move:NXM_NX_TUN_ID[0..31]->NXM_NX_REG0[],goto_table:10", clusterNetworkCIDR, localSubnetCIDR)
otx.AddFlow("table=0, priority=200, in_port=1, ip, nw_src=%s, nw_dst=224.0.0.0/4, actions=move:NXM_NX_TUN_ID[0..31]->NXM_NX_REG0[],goto_table:10", clusterNetworkCIDR)
otx.AddFlow("table=0, priority=150, in_port=1, actions=drop")
// tun0
if oc.useConnTrack {
otx.AddFlow("table=0, priority=400, in_port=2, ip, nw_src=%s, actions=goto_table:30", localSubnetGateway)
otx.AddFlow("table=0, priority=300, in_port=2, ip, nw_src=%s, nw_dst=%s, actions=goto_table:25", localSubnetCIDR, clusterNetworkCIDR)
}
otx.AddFlow("table=0, priority=250, in_port=2, ip, nw_dst=224.0.0.0/4, actions=drop")
otx.AddFlow("table=0, priority=200, in_port=2, arp, nw_src=%s, nw_dst=%s, actions=goto_table:30", localSubnetGateway, clusterNetworkCIDR)
otx.AddFlow("table=0, priority=200, in_port=2, ip, actions=goto_table:30")
otx.AddFlow("table=0, priority=150, in_port=2, actions=drop")
// else, from a container
otx.AddFlow("table=0, priority=100, arp, actions=goto_table:20")
otx.AddFlow("table=0, priority=100, ip, actions=goto_table:20")
otx.AddFlow("table=0, priority=0, actions=drop")
// Table 10: VXLAN ingress filtering; filled in by AddHostSubnetRules()
// eg, "table=10, priority=100, tun_src=${remote_node_ip}, actions=goto_table:30"
otx.AddFlow("table=10, priority=0, actions=drop")
// Table 20: from OpenShift container; validate IP/MAC, assign tenant-id; filled in by setupPodFlows
// eg, "table=20, priority=100, in_port=${ovs_port}, arp, nw_src=${ipaddr}, arp_sha=${macaddr}, actions=load:${tenant_id}->NXM_NX_REG0[], goto_table:21"
// "table=20, priority=100, in_port=${ovs_port}, ip, nw_src=${ipaddr}, actions=load:${tenant_id}->NXM_NX_REG0[], goto_table:21"
// (${tenant_id} is always 0 for single-tenant)
otx.AddFlow("table=20, priority=0, actions=drop")
// Table 21: from OpenShift container; NetworkPolicy plugin uses this for connection tracking
otx.AddFlow("table=21, priority=0, actions=goto_table:30")
if oc.useConnTrack {
// Table 25: IP from OpenShift container via Service IP; reload tenant-id; filled in by openshift-sdn-ovs
// eg, "table=25, priority=100, ip, nw_src=${ipaddr}, actions=load:${tenant_id}->NXM_NX_REG0[], goto_table:30"
otx.AddFlow("table=25, priority=0, actions=drop")
}
// Table 30: general routing
otx.AddFlow("table=30, priority=300, arp, nw_dst=%s, actions=output:2", localSubnetGateway)
otx.AddFlow("table=30, priority=200, arp, nw_dst=%s, actions=goto_table:40", localSubnetCIDR)
otx.AddFlow("table=30, priority=100, arp, nw_dst=%s, actions=goto_table:50", clusterNetworkCIDR)
otx.AddFlow("table=30, priority=300, ip, nw_dst=%s, actions=output:2", localSubnetGateway)
otx.AddFlow("table=30, priority=100, ip, nw_dst=%s, actions=goto_table:60", serviceNetworkCIDR)
if oc.useConnTrack {
otx.AddFlow("table=30, priority=300, ip, nw_dst=%s, ct_state=+rpl, actions=ct(nat),goto_table:70", localSubnetCIDR)
}
otx.AddFlow("table=30, priority=200, ip, nw_dst=%s, actions=goto_table:70", localSubnetCIDR)
otx.AddFlow("table=30, priority=100, ip, nw_dst=%s, actions=goto_table:90", clusterNetworkCIDR)
// Multicast coming from the VXLAN
otx.AddFlow("table=30, priority=50, in_port=1, ip, nw_dst=224.0.0.0/4, actions=goto_table:120")
// Multicast coming from local pods
otx.AddFlow("table=30, priority=25, ip, nw_dst=224.0.0.0/4, actions=goto_table:110")
otx.AddFlow("table=30, priority=0, ip, actions=goto_table:100")
otx.AddFlow("table=30, priority=0, arp, actions=drop")
// Table 40: ARP to local container, filled in by setupPodFlows
// eg, "table=40, priority=100, arp, nw_dst=${container_ip}, actions=output:${ovs_port}"
otx.AddFlow("table=40, priority=0, actions=drop")
// Table 50: ARP to remote container; filled in by AddHostSubnetRules()
// eg, "table=50, priority=100, arp, nw_dst=${remote_subnet_cidr}, actions=move:NXM_NX_REG0[]->NXM_NX_TUN_ID[0..31], set_field:${remote_node_ip}->tun_dst,output:1"
otx.AddFlow("table=50, priority=0, actions=drop")
// Table 60: IP to service from pod
if oc.useConnTrack {
otx.AddFlow("table=60, priority=200, actions=output:2")
} else {
otx.AddFlow("table=60, priority=200, reg0=0, actions=output:2")
// vnid/port mappings; filled in by AddServiceRules()
// eg, "table=60, priority=100, reg0=${tenant_id}, ${service_proto}, nw_dst=${service_ip}, tp_dst=${service_port}, actions=load:${tenant_id}->NXM_NX_REG1[], load:2->NXM_NX_REG2[], goto_table:80"
}
otx.AddFlow("table=60, priority=0, actions=drop")
// Table 70: IP to local container: vnid/port mappings; filled in by setupPodFlows
// eg, "table=70, priority=100, ip, nw_dst=${ipaddr}, actions=load:${tenant_id}->NXM_NX_REG1[], load:${ovs_port}->NXM_NX_REG2[], goto_table:80"
otx.AddFlow("table=70, priority=0, actions=drop")
// Table 80: IP policy enforcement; mostly managed by the osdnPolicy
otx.AddFlow("table=80, priority=300, ip, nw_src=%s/32, actions=output:NXM_NX_REG2[]", localSubnetGateway)
// eg, "table=80, priority=100, reg0=${tenant_id}, reg1=${tenant_id}, actions=output:NXM_NX_REG2[]"
otx.AddFlow("table=80, priority=0, actions=drop")
// Table 90: IP to remote container; filled in by AddHostSubnetRules()
// eg, "table=90, priority=100, ip, nw_dst=${remote_subnet_cidr}, actions=move:NXM_NX_REG0[]->NXM_NX_TUN_ID[0..31], set_field:${remote_node_ip}->tun_dst,output:1"
otx.AddFlow("table=90, priority=0, actions=drop")
// Table 100: egress network policy dispatch; edited by UpdateEgressNetworkPolicy()
// eg, "table=100, reg0=${tenant_id}, priority=2, ip, nw_dst=${external_cidr}, actions=drop
otx.AddFlow("table=100, priority=0, actions=output:2")
otx.AddFlow("table=100, priority=%d,tcp,tcp_dst=53,nw_dst=%s,actions=output:2", osapi.EgressNetworkPolicyMaxRules+1, nodeIP)
otx.AddFlow("table=100, priority=%d,udp,udp_dst=53,nw_dst=%s,actions=output:2", osapi.EgressNetworkPolicyMaxRules+1, nodeIP)
// Table 110: outbound multicast filtering, updated by UpdateLocalMulticastFlows()
// eg, "table=110, priority=100, reg0=${tenant_id}, actions=goto_table:111
otx.AddFlow("table=110, priority=0, actions=drop")
// Table 111: multicast delivery from local pods to the VXLAN; only one rule, updated by UpdateVXLANMulticastRules()
// eg, "table=111, priority=100, actions=move:NXM_NX_REG0[]->NXM_NX_TUN_ID[0..31],set_field:${remote_node_ip_1}->tun_dst,output:1,set_field:${remote_node_ip_2}->tun_dst,output:1,goto_table:120"
otx.AddFlow("table=111, priority=100, actions=goto_table:120")
// Table 120: multicast delivery to local pods (either from VXLAN or local pods); updated by UpdateLocalMulticastFlows()
// eg, "table=120, priority=100, reg0=${tenant_id}, actions=output:${ovs_port_1},output:${ovs_port_2}"
otx.AddFlow("table=120, priority=0, actions=drop")
// Table 253: rule version note
otx.AddFlow("table=%d, actions=note:%s", VERSION_TABLE, oc.getVersionNote())
err = otx.EndTransaction()
if err != nil {
return err
}
return nil
}
func (oc *ovsController) NewTransaction() ovs.Transaction {
return oc.ovs.NewTransaction()
}
func (oc *ovsController) ensureOvsPort(hostVeth string) (int, error) {
return oc.ovs.AddPort(hostVeth, -1)
}
func (oc *ovsController) setupPodFlows(ofport int, podIP, podMAC, note string, vnid uint32) error {
otx := oc.ovs.NewTransaction()
// ARP/IP traffic from container
otx.AddFlow("table=20, priority=100, in_port=%d, arp, nw_src=%s, arp_sha=%s, actions=load:%d->NXM_NX_REG0[], note:%s, goto_table:21", ofport, podIP, podMAC, vnid, note)
otx.AddFlow("table=20, priority=100, in_port=%d, ip, nw_src=%s, actions=load:%d->NXM_NX_REG0[], goto_table:21", ofport, podIP, vnid)
if oc.useConnTrack {
otx.AddFlow("table=25, priority=100, ip, nw_src=%s, actions=load:%d->NXM_NX_REG0[], goto_table:30", podIP, vnid)
}
// ARP request/response to container (not isolated)
otx.AddFlow("table=40, priority=100, arp, nw_dst=%s, actions=output:%d", podIP, ofport)
// IP traffic to container
otx.AddFlow("table=70, priority=100, ip, nw_dst=%s, actions=load:%d->NXM_NX_REG1[], load:%d->NXM_NX_REG2[], goto_table:80", podIP, vnid, ofport)
return otx.EndTransaction()
}
func (oc *ovsController) cleanupPodFlows(podIP string) error {
otx := oc.ovs.NewTransaction()
otx.DeleteFlows("ip, nw_dst=%s", podIP)
otx.DeleteFlows("ip, nw_src=%s", podIP)
otx.DeleteFlows("arp, nw_dst=%s", podIP)
otx.DeleteFlows("arp, nw_src=%s", podIP)
return otx.EndTransaction()
}
func getPodNote(sandboxID string) (string, error) {
bytes, err := hex.DecodeString(sandboxID)
if err != nil {
return "", fmt.Errorf("failed to decode sandbox ID %q: %v", sandboxID, err)
}
if len(bytes) != 32 {
return "", fmt.Errorf("invalid sandbox ID %q length; expected 32 bytes", sandboxID)
}
var note string
for _, b := range bytes {
if len(note) > 0 {
note += "."
}
note += fmt.Sprintf("%02x", b)
}
return note, nil
}
func (oc *ovsController) SetUpPod(hostVeth, podIP, podMAC, sandboxID string, vnid uint32) (int, error) {
note, err := getPodNote(sandboxID)
if err != nil {
return -1, err
}
ofport, err := oc.ensureOvsPort(hostVeth)
if err != nil {
return -1, err
}
return ofport, oc.setupPodFlows(ofport, podIP, podMAC, note, vnid)
}
func (oc *ovsController) SetPodBandwidth(hostVeth string, ingressBPS, egressBPS int64) error {
// note pod ingress == OVS egress and vice versa
qos, err := oc.ovs.Get("port", hostVeth, "qos")
if err != nil {
return err
}
if qos != "[]" {
err = oc.ovs.Clear("port", hostVeth, "qos")
if err != nil {
return err
}
err = oc.ovs.Destroy("qos", qos)
if err != nil {
return err
}
}
if ingressBPS > 0 {
qos, err := oc.ovs.Create("qos", "type=linux-htb", fmt.Sprintf("other-config:max-rate=%d", ingressBPS))
if err != nil {
return err
}
err = oc.ovs.Set("port", hostVeth, fmt.Sprintf("qos=%s", qos))
if err != nil {
return err
}
}
if egressBPS > 0 {
// ingress_policing_rate is in Kbps
err := oc.ovs.Set("interface", hostVeth, fmt.Sprintf("ingress_policing_rate=%d", egressBPS/1024))
if err != nil {
return err
}
}
return nil
}
func getPodDetailsBySandboxID(flows []string, sandboxID string) (int, string, string, string, error) {
note, err := getPodNote(sandboxID)
if err != nil {
return 0, "", "", "", err
}
// Find the table=20 flow with the given note and extract the podIP, ofport, and MAC from them
for _, flow := range flows {
parsed, err := ovs.ParseFlow(ovs.ParseForDump, flow)
if err != nil {
return 0, "", "", "", err
}
if parsed.Table != 20 || !parsed.NoteHasPrefix(note) {
continue
}
macField, macOk := parsed.FindField("arp_sha")
portField, pOk := parsed.FindField("in_port")
ipField, ipOk := parsed.FindField("arp_spa")
if !macOk || !pOk || !ipOk {
continue
}
ofport, err := strconv.Atoi(portField.Value)
if err != nil {
return 0, "", "", "", fmt.Errorf("failed to parse ofport %q: %v", portField.Value, err)
}
if _, err := net.ParseMAC(macField.Value); err != nil {
return 0, "", "", "", fmt.Errorf("failed to parse arp_sha %q: %v", macField.Value, err)
}
podMAC := macField.Value
if net.ParseIP(ipField.Value) == nil {
return 0, "", "", "", fmt.Errorf("failed to parse arp_spa %q", ipField.Value)
}
podIP := ipField.Value
return ofport, podIP, podMAC, note, nil
}
return 0, "", "", "", fmt.Errorf("failed to find pod details from OVS flows")
}
func (oc *ovsController) UpdatePod(sandboxID string, vnid uint32) error {
flows, err := oc.ovs.DumpFlows()
if err != nil {
return err
}
ofport, podIP, podMAC, note, err := getPodDetailsBySandboxID(flows, sandboxID)
if err != nil {
return err
}
err = oc.cleanupPodFlows(podIP)
if err != nil {
return err
}
return oc.setupPodFlows(ofport, podIP, podMAC, note, vnid)
}
func (oc *ovsController) TearDownPod(hostVeth, podIP string) error {
err := oc.cleanupPodFlows(podIP)
if err != nil {
return err
}
_ = oc.SetPodBandwidth(hostVeth, -1, -1)
return oc.ovs.DeletePort(hostVeth)
}
func policyNames(policies []osapi.EgressNetworkPolicy) string {
names := make([]string, len(policies))
for i, policy := range policies {
names[i] = policy.Namespace + ":" + policy.Name
}
return strings.Join(names, ", ")
}
func (oc *ovsController) UpdateEgressNetworkPolicyRules(policies []osapi.EgressNetworkPolicy, vnid uint32, namespaces []string, egressDNS *EgressDNS) error {
otx := oc.ovs.NewTransaction()
var inputErr error
if len(policies) == 0 {
otx.DeleteFlows("table=100, reg0=%d", vnid)
} else if vnid == 0 {
inputErr = fmt.Errorf("EgressNetworkPolicy in global network namespace is not allowed (%s); ignoring", policyNames(policies))
} else if len(namespaces) > 1 {
// Rationale: In our current implementation, multiple namespaces share their network by using the same VNID.
// Even though Egress network policy is defined per namespace, its implementation is based on VNIDs.
// So in case of shared network namespaces, egress policy of one namespace will affect all other namespaces that are sharing the network which might not be desirable.
inputErr = fmt.Errorf("EgressNetworkPolicy not allowed in shared NetNamespace (%s); dropping all traffic", strings.Join(namespaces, ", "))
otx.DeleteFlows("table=100, reg0=%d", vnid)
otx.AddFlow("table=100, reg0=%d, priority=1, actions=drop", vnid)
} else if len(policies) > 1 {
// Rationale: If we have allowed more than one policy, we could end up with different network restrictions depending
// on the order of policies that were processed and also it doesn't give more expressive power than a single policy.
inputErr = fmt.Errorf("multiple EgressNetworkPolicies in same network namespace (%s) is not allowed; dropping all traffic", policyNames(policies))
otx.DeleteFlows("table=100, reg0=%d", vnid)
otx.AddFlow("table=100, reg0=%d, priority=1, actions=drop", vnid)
} else /* vnid != 0 && len(policies) == 1 */ {
// Temporarily drop all outgoing traffic, to avoid race conditions while modifying the other rules
otx.AddFlow("table=100, reg0=%d, cookie=1, priority=65535, actions=drop", vnid)
otx.DeleteFlows("table=100, reg0=%d, cookie=0/1", vnid)
dnsFound := false
for i, rule := range policies[0].Spec.Egress {
priority := len(policies[0].Spec.Egress) - i
var action string
if rule.Type == osapi.EgressNetworkPolicyRuleAllow {
action = "output:2"
} else {
action = "drop"
}
var selectors []string
if len(rule.To.CIDRSelector) > 0 {
selectors = append(selectors, rule.To.CIDRSelector)
} else if len(rule.To.DNSName) > 0 {
dnsFound = true
ips := egressDNS.GetIPs(policies[0], rule.To.DNSName)
for _, ip := range ips {
selectors = append(selectors, ip.String())
}
}
for _, selector := range selectors {
var dst string
if selector == "0.0.0.0/0" {
dst = ""
} else if selector == "0.0.0.0/32" {
glog.Warningf("Correcting CIDRSelector '0.0.0.0/32' to '0.0.0.0/0' in EgressNetworkPolicy %s:%s", policies[0].Namespace, policies[0].Name)
dst = ""
} else {
dst = fmt.Sprintf(", nw_dst=%s", selector)
}
otx.AddFlow("table=100, reg0=%d, priority=%d, ip%s, actions=%s", vnid, priority, dst, action)
}
}
if dnsFound {
if err := CheckDNSResolver(); err != nil {
inputErr = fmt.Errorf("DNS resolver failed: %v, dropping all traffic for namespace: %q", err, namespaces[0])
otx.DeleteFlows("table=100, reg0=%d", vnid)
otx.AddFlow("table=100, reg0=%d, priority=1, actions=drop", vnid)
}
}
otx.DeleteFlows("table=100, reg0=%d, cookie=1/1", vnid)
}
txErr := otx.EndTransaction()
if inputErr != nil {
return inputErr
} else {
return txErr
}
}
func (oc *ovsController) AddHostSubnetRules(subnet *osapi.HostSubnet) error {
otx := oc.ovs.NewTransaction()
otx.AddFlow("table=10, priority=100, tun_src=%s, actions=goto_table:30", subnet.HostIP)
if vnid, ok := subnet.Annotations[osapi.FixedVNIDHostAnnotation]; ok {
otx.AddFlow("table=50, priority=100, arp, nw_dst=%s, actions=load:%s->NXM_NX_TUN_ID[0..31],set_field:%s->tun_dst,output:1", subnet.Subnet, vnid, subnet.HostIP)
otx.AddFlow("table=90, priority=100, ip, nw_dst=%s, actions=load:%s->NXM_NX_TUN_ID[0..31],set_field:%s->tun_dst,output:1", subnet.Subnet, vnid, subnet.HostIP)
} else {
otx.AddFlow("table=50, priority=100, arp, nw_dst=%s, actions=move:NXM_NX_REG0[]->NXM_NX_TUN_ID[0..31],set_field:%s->tun_dst,output:1", subnet.Subnet, subnet.HostIP)
otx.AddFlow("table=90, priority=100, ip, nw_dst=%s, actions=move:NXM_NX_REG0[]->NXM_NX_TUN_ID[0..31],set_field:%s->tun_dst,output:1", subnet.Subnet, subnet.HostIP)
}
return otx.EndTransaction()
}
func (oc *ovsController) DeleteHostSubnetRules(subnet *osapi.HostSubnet) error {
otx := oc.ovs.NewTransaction()
otx.DeleteFlows("table=10, tun_src=%s", subnet.HostIP)
otx.DeleteFlows("table=50, arp, nw_dst=%s", subnet.Subnet)
otx.DeleteFlows("table=90, ip, nw_dst=%s", subnet.Subnet)
return otx.EndTransaction()
}
func (oc *ovsController) AddServiceRules(service *kapi.Service, netID uint32) error {
otx := oc.ovs.NewTransaction()
action := fmt.Sprintf(", priority=100, actions=load:%d->NXM_NX_REG1[], load:2->NXM_NX_REG2[], goto_table:80", netID)
// Add blanket rule allowing subsequent IP fragments
otx.AddFlow(generateBaseServiceRule(service.Spec.ClusterIP) + ", ip_frag=later" + action)
for _, port := range service.Spec.Ports {
baseRule, err := generateBaseAddServiceRule(service.Spec.ClusterIP, port.Protocol, int(port.Port))
if err != nil {
glog.Errorf("Error creating OVS flow for service %v, netid %d: %v", service, netID, err)
}
otx.AddFlow(baseRule + action)
}
return otx.EndTransaction()
}
func (oc *ovsController) DeleteServiceRules(service *kapi.Service) error {
otx := oc.ovs.NewTransaction()
otx.DeleteFlows(generateBaseServiceRule(service.Spec.ClusterIP))
return otx.EndTransaction()
}
func generateBaseServiceRule(IP string) string {
return fmt.Sprintf("table=60, ip, nw_dst=%s", IP)
}
func generateBaseAddServiceRule(IP string, protocol kapi.Protocol, port int) (string, error) {
var dst string
if protocol == kapi.ProtocolUDP {
dst = fmt.Sprintf(", udp, udp_dst=%d", port)
} else if protocol == kapi.ProtocolTCP {
dst = fmt.Sprintf(", tcp, tcp_dst=%d", port)
} else {
return "", fmt.Errorf("unhandled protocol %v", protocol)
}
return generateBaseServiceRule(IP) + dst, nil
}
func (oc *ovsController) UpdateLocalMulticastFlows(vnid uint32, enabled bool, ofports []int) error {
otx := oc.ovs.NewTransaction()
if enabled {
otx.AddFlow("table=110, reg0=%d, actions=goto_table:111", vnid)
} else {
otx.DeleteFlows("table=110, reg0=%d", vnid)
}
var actions []string
if enabled && len(ofports) > 0 {
actions = make([]string, len(ofports))
for i, ofport := range ofports {
actions[i] = fmt.Sprintf("output:%d", ofport)
}
sort.Strings(actions)
otx.AddFlow("table=120, priority=100, reg0=%d, actions=%s", vnid, strings.Join(actions, ","))
} else {
otx.DeleteFlows("table=120, reg0=%d", vnid)
}
return otx.EndTransaction()
}
func (oc *ovsController) UpdateVXLANMulticastFlows(remoteIPs []string) error {
otx := oc.ovs.NewTransaction()
if len(remoteIPs) > 0 {
actions := make([]string, len(remoteIPs))
for i, ip := range remoteIPs {
actions[i] = fmt.Sprintf("set_field:%s->tun_dst,output:1", ip)
}
sort.Strings(actions)
otx.AddFlow("table=111, priority=100, actions=move:NXM_NX_REG0[]->NXM_NX_TUN_ID[0..31],%s,goto_table:120", strings.Join(actions, ","))
} else {
otx.AddFlow("table=111, priority=100, actions=goto_table:120")
}
return otx.EndTransaction()
}
// FindUnusedVNIDs returns a list of VNIDs for which there are table 80 "check" rules,
// but no table 60/70 "load" rules (meaning that there are no longer any pods or services
// on this node with that VNID). There is no locking with respect to other ovsController
// actions, but as long the "add a pod" and "add a service" codepaths add the
// pod/service-specific rules before they call policy.EnsureVNIDRules(), then there is no
// race condition.
func (oc *ovsController) FindUnusedVNIDs() []int {
flows, err := oc.ovs.DumpFlows()
if err != nil {
glog.Errorf("FindUnusedVNIDs: could not DumpFlows: %v", err)
return nil
}
// inUseVNIDs is the set of VNIDs in use by pods or services on this node.
// policyVNIDs is the set of VNIDs that we have rules for delivering to.
// VNID 0 is always assumed to be in both sets.
inUseVNIDs := sets.NewInt(0)
policyVNIDs := sets.NewInt(0)
for _, flow := range flows {
parsed, err := ovs.ParseFlow(ovs.ParseForDump, flow)
if err != nil {
glog.Warningf("FindUnusedVNIDs: could not parse flow %q: %v", flow, err)
continue
}
// A VNID is in use if there is a table 60 (services) or 70 (pods) flow that
// loads that VNID into reg1 for later comparison.
if parsed.Table == 60 || parsed.Table == 70 {
// Can't use FindAction here since there may be multiple "load"s
for _, action := range parsed.Actions {
if action.Name != "load" || strings.Index(action.Value, "REG1") == -1 {
continue
}
vnidEnd := strings.Index(action.Value, "->")
if vnidEnd == -1 {
continue
}
vnid, err := strconv.ParseInt(action.Value[:vnidEnd], 0, 32)
if err != nil {
glog.Warningf("FindUnusedVNIDs: could not parse VNID in 'load:%s': %v", action.Value, err)
continue
}
inUseVNIDs.Insert(int(vnid))
break
}
}
// A VNID is checked by policy if there is a table 80 rule comparing reg1 to it.
if parsed.Table == 80 {
if field, exists := parsed.FindField("reg1"); exists {
vnid, err := strconv.ParseInt(field.Value, 0, 32)
if err != nil {
glog.Warningf("FindUnusedVNIDs: could not parse VNID in 'reg1=%s': %v", field.Value, err)
continue
}
policyVNIDs.Insert(int(vnid))
}
}
}
return policyVNIDs.Difference(inUseVNIDs).UnsortedList()
}