forked from openvswitch/ovs
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathofp-parse.c
1636 lines (1450 loc) · 53.3 KB
/
ofp-parse.c
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
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright (c) 2010, 2011, 2012, 2013, 2014, 2015 Nicira, Inc.
*
* 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.
*/
#include <config.h>
#include "ofp-parse.h"
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include "byte-order.h"
#include "dynamic-string.h"
#include "learn.h"
#include "meta-flow.h"
#include "multipath.h"
#include "netdev.h"
#include "nx-match.h"
#include "ofp-actions.h"
#include "ofp-util.h"
#include "ofpbuf.h"
#include "openflow/openflow.h"
#include "ovs-thread.h"
#include "packets.h"
#include "simap.h"
#include "socket-util.h"
#include "openvswitch/vconn.h"
/* Parses 'str' as an 8-bit unsigned integer into '*valuep'.
*
* 'name' describes the value parsed in an error message, if any.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
str_to_u8(const char *str, const char *name, uint8_t *valuep)
{
int value;
if (!str_to_int(str, 0, &value) || value < 0 || value > 255) {
return xasprintf("invalid %s \"%s\"", name, str);
}
*valuep = value;
return NULL;
}
/* Parses 'str' as a 16-bit unsigned integer into '*valuep'.
*
* 'name' describes the value parsed in an error message, if any.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
str_to_u16(const char *str, const char *name, uint16_t *valuep)
{
int value;
if (!str_to_int(str, 0, &value) || value < 0 || value > 65535) {
return xasprintf("invalid %s \"%s\"", name, str);
}
*valuep = value;
return NULL;
}
/* Parses 'str' as a 32-bit unsigned integer into '*valuep'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
str_to_u32(const char *str, uint32_t *valuep)
{
char *tail;
uint32_t value;
if (!str[0]) {
return xstrdup("missing required numeric argument");
}
errno = 0;
value = strtoul(str, &tail, 0);
if (errno == EINVAL || errno == ERANGE || *tail) {
return xasprintf("invalid numeric format %s", str);
}
*valuep = value;
return NULL;
}
/* Parses 'str' as an 64-bit unsigned integer into '*valuep'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
str_to_u64(const char *str, uint64_t *valuep)
{
char *tail;
uint64_t value;
if (!str[0]) {
return xstrdup("missing required numeric argument");
}
errno = 0;
value = strtoull(str, &tail, 0);
if (errno == EINVAL || errno == ERANGE || *tail) {
return xasprintf("invalid numeric format %s", str);
}
*valuep = value;
return NULL;
}
/* Parses 'str' as an 64-bit unsigned integer in network byte order into
* '*valuep'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
str_to_be64(const char *str, ovs_be64 *valuep)
{
uint64_t value = 0;
char *error;
error = str_to_u64(str, &value);
if (!error) {
*valuep = htonll(value);
}
return error;
}
/* Parses 'str' as an Ethernet address into 'mac'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
str_to_mac(const char *str, struct eth_addr *mac)
{
if (!ovs_scan(str, ETH_ADDR_SCAN_FMT, ETH_ADDR_SCAN_ARGS(*mac))) {
return xasprintf("invalid mac address %s", str);
}
return NULL;
}
/* Parses 'str' as an IP address into '*ip'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
str_to_ip(const char *str, ovs_be32 *ip)
{
struct in_addr in_addr;
if (lookup_ip(str, &in_addr)) {
return xasprintf("%s: could not convert to IP address", str);
}
*ip = in_addr.s_addr;
return NULL;
}
struct protocol {
const char *name;
uint16_t dl_type;
uint8_t nw_proto;
};
static bool
parse_protocol(const char *name, const struct protocol **p_out)
{
static const struct protocol protocols[] = {
{ "ip", ETH_TYPE_IP, 0 },
{ "ipv4", ETH_TYPE_IP, 0 },
{ "ip4", ETH_TYPE_IP, 0 },
{ "arp", ETH_TYPE_ARP, 0 },
{ "icmp", ETH_TYPE_IP, IPPROTO_ICMP },
{ "tcp", ETH_TYPE_IP, IPPROTO_TCP },
{ "udp", ETH_TYPE_IP, IPPROTO_UDP },
{ "sctp", ETH_TYPE_IP, IPPROTO_SCTP },
{ "ipv6", ETH_TYPE_IPV6, 0 },
{ "ip6", ETH_TYPE_IPV6, 0 },
{ "icmp6", ETH_TYPE_IPV6, IPPROTO_ICMPV6 },
{ "tcp6", ETH_TYPE_IPV6, IPPROTO_TCP },
{ "udp6", ETH_TYPE_IPV6, IPPROTO_UDP },
{ "sctp6", ETH_TYPE_IPV6, IPPROTO_SCTP },
{ "rarp", ETH_TYPE_RARP, 0},
{ "mpls", ETH_TYPE_MPLS, 0 },
{ "mplsm", ETH_TYPE_MPLS_MCAST, 0 },
};
const struct protocol *p;
for (p = protocols; p < &protocols[ARRAY_SIZE(protocols)]; p++) {
if (!strcmp(p->name, name)) {
*p_out = p;
return true;
}
}
*p_out = NULL;
return false;
}
/* Parses 's' as the (possibly masked) value of field 'mf', and updates
* 'match' appropriately. Restricts the set of usable protocols to ones
* supporting the parsed field.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
static char * OVS_WARN_UNUSED_RESULT
parse_field(const struct mf_field *mf, const char *s, struct match *match,
enum ofputil_protocol *usable_protocols)
{
union mf_value value, mask;
char *error;
if (!*s) {
/* If there's no string, we're just trying to match on the
* existence of the field, so use a no-op value. */
s = "0/0";
}
error = mf_parse(mf, s, &value, &mask);
if (!error) {
*usable_protocols &= mf_set(mf, &value, &mask, match, &error);
}
return error;
}
static char *
extract_actions(char *s)
{
s = strstr(s, "action");
if (s) {
*s = '\0';
s = strchr(s + 1, '=');
return s ? s + 1 : NULL;
} else {
return NULL;
}
}
static char * OVS_WARN_UNUSED_RESULT
parse_ofp_str__(struct ofputil_flow_mod *fm, int command, char *string,
enum ofputil_protocol *usable_protocols)
{
enum {
F_OUT_PORT = 1 << 0,
F_ACTIONS = 1 << 1,
F_IMPORTANCE = 1 << 2,
F_TIMEOUT = 1 << 3,
F_PRIORITY = 1 << 4,
F_FLAGS = 1 << 5,
} fields;
char *act_str = NULL;
char *name, *value;
*usable_protocols = OFPUTIL_P_ANY;
if (command == -2) {
size_t len;
string += strspn(string, " \t\r\n"); /* Skip white space. */
len = strcspn(string, ", \t\r\n"); /* Get length of the first token. */
if (!strncmp(string, "add", len)) {
command = OFPFC_ADD;
} else if (!strncmp(string, "delete", len)) {
command = OFPFC_DELETE;
} else if (!strncmp(string, "delete_strict", len)) {
command = OFPFC_DELETE_STRICT;
} else if (!strncmp(string, "modify", len)) {
command = OFPFC_MODIFY;
} else if (!strncmp(string, "modify_strict", len)) {
command = OFPFC_MODIFY_STRICT;
} else {
len = 0;
command = OFPFC_ADD;
}
string += len;
}
switch (command) {
case -1:
fields = F_OUT_PORT;
break;
case OFPFC_ADD:
fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS | F_IMPORTANCE;
break;
case OFPFC_DELETE:
fields = F_OUT_PORT;
break;
case OFPFC_DELETE_STRICT:
fields = F_OUT_PORT | F_PRIORITY;
break;
case OFPFC_MODIFY:
fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
break;
case OFPFC_MODIFY_STRICT:
fields = F_ACTIONS | F_TIMEOUT | F_PRIORITY | F_FLAGS;
break;
default:
OVS_NOT_REACHED();
}
match_init_catchall(&fm->match);
fm->priority = OFP_DEFAULT_PRIORITY;
fm->cookie = htonll(0);
fm->cookie_mask = htonll(0);
if (command == OFPFC_MODIFY || command == OFPFC_MODIFY_STRICT) {
/* For modify, by default, don't update the cookie. */
fm->new_cookie = OVS_BE64_MAX;
} else{
fm->new_cookie = htonll(0);
}
fm->modify_cookie = false;
fm->table_id = 0xff;
fm->command = command;
fm->idle_timeout = OFP_FLOW_PERMANENT;
fm->hard_timeout = OFP_FLOW_PERMANENT;
fm->buffer_id = UINT32_MAX;
fm->out_port = OFPP_ANY;
fm->flags = 0;
fm->importance = 0;
fm->out_group = OFPG11_ANY;
fm->delete_reason = OFPRR_DELETE;
if (fields & F_ACTIONS) {
act_str = extract_actions(string);
if (!act_str) {
return xstrdup("must specify an action");
}
}
while (ofputil_parse_key_value(&string, &name, &value)) {
const struct protocol *p;
char *error = NULL;
if (parse_protocol(name, &p)) {
match_set_dl_type(&fm->match, htons(p->dl_type));
if (p->nw_proto) {
match_set_nw_proto(&fm->match, p->nw_proto);
}
} else if (fields & F_FLAGS && !strcmp(name, "send_flow_rem")) {
fm->flags |= OFPUTIL_FF_SEND_FLOW_REM;
} else if (fields & F_FLAGS && !strcmp(name, "check_overlap")) {
fm->flags |= OFPUTIL_FF_CHECK_OVERLAP;
} else if (fields & F_FLAGS && !strcmp(name, "reset_counts")) {
fm->flags |= OFPUTIL_FF_RESET_COUNTS;
*usable_protocols &= OFPUTIL_P_OF12_UP;
} else if (fields & F_FLAGS && !strcmp(name, "no_packet_counts")) {
fm->flags |= OFPUTIL_FF_NO_PKT_COUNTS;
*usable_protocols &= OFPUTIL_P_OF13_UP;
} else if (fields & F_FLAGS && !strcmp(name, "no_byte_counts")) {
fm->flags |= OFPUTIL_FF_NO_BYT_COUNTS;
*usable_protocols &= OFPUTIL_P_OF13_UP;
} else if (!strcmp(name, "no_readonly_table")
|| !strcmp(name, "allow_hidden_fields")) {
/* ignore these fields. */
} else if (mf_from_name(name)) {
error = parse_field(mf_from_name(name), value, &fm->match,
usable_protocols);
} else {
if (!*value) {
return xasprintf("field %s missing value", name);
}
if (!strcmp(name, "table")) {
error = str_to_u8(value, "table", &fm->table_id);
if (fm->table_id != 0xff) {
*usable_protocols &= OFPUTIL_P_TID;
}
} else if (fields & F_OUT_PORT && !strcmp(name, "out_port")) {
if (!ofputil_port_from_string(value, &fm->out_port)) {
error = xasprintf("%s is not a valid OpenFlow port",
value);
}
} else if (fields & F_PRIORITY && !strcmp(name, "priority")) {
uint16_t priority = 0;
error = str_to_u16(value, name, &priority);
fm->priority = priority;
} else if (fields & F_TIMEOUT && !strcmp(name, "idle_timeout")) {
error = str_to_u16(value, name, &fm->idle_timeout);
} else if (fields & F_TIMEOUT && !strcmp(name, "hard_timeout")) {
error = str_to_u16(value, name, &fm->hard_timeout);
} else if (fields & F_IMPORTANCE && !strcmp(name, "importance")) {
error = str_to_u16(value, name, &fm->importance);
} else if (!strcmp(name, "cookie")) {
char *mask = strchr(value, '/');
if (mask) {
/* A mask means we're searching for a cookie. */
if (command == OFPFC_ADD) {
return xstrdup("flow additions cannot use "
"a cookie mask");
}
*mask = '\0';
error = str_to_be64(value, &fm->cookie);
if (error) {
return error;
}
error = str_to_be64(mask + 1, &fm->cookie_mask);
/* Matching of the cookie is only supported through NXM or
* OF1.1+. */
if (fm->cookie_mask != htonll(0)) {
*usable_protocols &= OFPUTIL_P_NXM_OF11_UP;
}
} else {
/* No mask means that the cookie is being set. */
if (command != OFPFC_ADD && command != OFPFC_MODIFY
&& command != OFPFC_MODIFY_STRICT) {
return xstrdup("cannot set cookie");
}
error = str_to_be64(value, &fm->new_cookie);
fm->modify_cookie = true;
}
} else if (!strcmp(name, "duration")
|| !strcmp(name, "n_packets")
|| !strcmp(name, "n_bytes")
|| !strcmp(name, "idle_age")
|| !strcmp(name, "hard_age")) {
/* Ignore these, so that users can feed the output of
* "ovs-ofctl dump-flows" back into commands that parse
* flows. */
} else {
error = xasprintf("unknown keyword %s", name);
}
}
if (error) {
return error;
}
}
/* Check for usable protocol interdependencies between match fields. */
if (fm->match.flow.dl_type == htons(ETH_TYPE_IPV6)) {
const struct flow_wildcards *wc = &fm->match.wc;
/* Only NXM and OXM support matching L3 and L4 fields within IPv6.
*
* (IPv6 specific fields as well as arp_sha, arp_tha, nw_frag, and
* nw_ttl are covered elsewhere so they don't need to be included in
* this test too.)
*/
if (wc->masks.nw_proto || wc->masks.nw_tos
|| wc->masks.tp_src || wc->masks.tp_dst) {
*usable_protocols &= OFPUTIL_P_NXM_OXM_ANY;
}
}
if (!fm->cookie_mask && fm->new_cookie == OVS_BE64_MAX
&& (command == OFPFC_MODIFY || command == OFPFC_MODIFY_STRICT)) {
/* On modifies without a mask, we are supposed to add a flow if
* one does not exist. If a cookie wasn't been specified, use a
* default of zero. */
fm->new_cookie = htonll(0);
}
if (fields & F_ACTIONS) {
enum ofputil_protocol action_usable_protocols;
struct ofpbuf ofpacts;
char *error;
ofpbuf_init(&ofpacts, 32);
error = ofpacts_parse_instructions(act_str, &ofpacts,
&action_usable_protocols);
*usable_protocols &= action_usable_protocols;
if (!error) {
enum ofperr err;
err = ofpacts_check(ofpacts.data, ofpacts.size, &fm->match.flow,
OFPP_MAX, fm->table_id, 255, usable_protocols);
if (!err && !*usable_protocols) {
err = OFPERR_OFPBAC_MATCH_INCONSISTENT;
}
if (err) {
error = xasprintf("actions are invalid with specified match "
"(%s)", ofperr_to_string(err));
}
}
if (error) {
ofpbuf_uninit(&ofpacts);
return error;
}
fm->ofpacts_len = ofpacts.size;
fm->ofpacts = ofpbuf_steal_data(&ofpacts);
} else {
fm->ofpacts_len = 0;
fm->ofpacts = NULL;
}
return NULL;
}
/* Convert 'str_' (as described in the Flow Syntax section of the ovs-ofctl man
* page) into 'fm' for sending the specified flow_mod 'command' to a switch.
* Returns the set of usable protocols in '*usable_protocols'.
*
* To parse syntax for an OFPT_FLOW_MOD (or NXT_FLOW_MOD), use an OFPFC_*
* constant for 'command'. To parse syntax for an OFPST_FLOW or
* OFPST_AGGREGATE (or NXST_FLOW or NXST_AGGREGATE), use -1 for 'command'.
*
* If 'command' is given as -2, 'str_' may begin with a command name ("add",
* "modify", "delete", "modify_strict", or "delete_strict"). A missing command
* name is treated as "add".
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
parse_ofp_str(struct ofputil_flow_mod *fm, int command, const char *str_,
enum ofputil_protocol *usable_protocols)
{
char *string = xstrdup(str_);
char *error;
error = parse_ofp_str__(fm, command, string, usable_protocols);
if (error) {
fm->ofpacts = NULL;
fm->ofpacts_len = 0;
}
free(string);
return error;
}
static char * OVS_WARN_UNUSED_RESULT
parse_ofp_meter_mod_str__(struct ofputil_meter_mod *mm, char *string,
struct ofpbuf *bands, int command,
enum ofputil_protocol *usable_protocols)
{
enum {
F_METER = 1 << 0,
F_FLAGS = 1 << 1,
F_BANDS = 1 << 2,
} fields;
char *save_ptr = NULL;
char *band_str = NULL;
char *name;
/* Meters require at least OF 1.3. */
*usable_protocols = OFPUTIL_P_OF13_UP;
switch (command) {
case -1:
fields = F_METER;
break;
case OFPMC13_ADD:
fields = F_METER | F_FLAGS | F_BANDS;
break;
case OFPMC13_DELETE:
fields = F_METER;
break;
case OFPMC13_MODIFY:
fields = F_METER | F_FLAGS | F_BANDS;
break;
default:
OVS_NOT_REACHED();
}
mm->command = command;
mm->meter.meter_id = 0;
mm->meter.flags = 0;
if (fields & F_BANDS) {
band_str = strstr(string, "band");
if (!band_str) {
return xstrdup("must specify bands");
}
*band_str = '\0';
band_str = strchr(band_str + 1, '=');
if (!band_str) {
return xstrdup("must specify bands");
}
band_str++;
}
for (name = strtok_r(string, "=, \t\r\n", &save_ptr); name;
name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
if (fields & F_FLAGS && !strcmp(name, "kbps")) {
mm->meter.flags |= OFPMF13_KBPS;
} else if (fields & F_FLAGS && !strcmp(name, "pktps")) {
mm->meter.flags |= OFPMF13_PKTPS;
} else if (fields & F_FLAGS && !strcmp(name, "burst")) {
mm->meter.flags |= OFPMF13_BURST;
} else if (fields & F_FLAGS && !strcmp(name, "stats")) {
mm->meter.flags |= OFPMF13_STATS;
} else {
char *value;
value = strtok_r(NULL, ", \t\r\n", &save_ptr);
if (!value) {
return xasprintf("field %s missing value", name);
}
if (!strcmp(name, "meter")) {
if (!strcmp(value, "all")) {
mm->meter.meter_id = OFPM13_ALL;
} else if (!strcmp(value, "controller")) {
mm->meter.meter_id = OFPM13_CONTROLLER;
} else if (!strcmp(value, "slowpath")) {
mm->meter.meter_id = OFPM13_SLOWPATH;
} else {
char *error = str_to_u32(value, &mm->meter.meter_id);
if (error) {
return error;
}
if (mm->meter.meter_id > OFPM13_MAX
|| !mm->meter.meter_id) {
return xasprintf("invalid value for %s", name);
}
}
} else {
return xasprintf("unknown keyword %s", name);
}
}
}
if (fields & F_METER && !mm->meter.meter_id) {
return xstrdup("must specify 'meter'");
}
if (fields & F_FLAGS && !mm->meter.flags) {
return xstrdup("meter must specify either 'kbps' or 'pktps'");
}
if (fields & F_BANDS) {
uint16_t n_bands = 0;
struct ofputil_meter_band *band = NULL;
int i;
for (name = strtok_r(band_str, "=, \t\r\n", &save_ptr); name;
name = strtok_r(NULL, "=, \t\r\n", &save_ptr)) {
char *value;
value = strtok_r(NULL, ", \t\r\n", &save_ptr);
if (!value) {
return xasprintf("field %s missing value", name);
}
if (!strcmp(name, "type")) {
/* Start a new band */
band = ofpbuf_put_zeros(bands, sizeof *band);
n_bands++;
if (!strcmp(value, "drop")) {
band->type = OFPMBT13_DROP;
} else if (!strcmp(value, "dscp_remark")) {
band->type = OFPMBT13_DSCP_REMARK;
} else {
return xasprintf("field %s unknown value %s", name, value);
}
} else if (!band || !band->type) {
return xstrdup("band must start with the 'type' keyword");
} else if (!strcmp(name, "rate")) {
char *error = str_to_u32(value, &band->rate);
if (error) {
return error;
}
} else if (!strcmp(name, "burst_size")) {
char *error = str_to_u32(value, &band->burst_size);
if (error) {
return error;
}
} else if (!strcmp(name, "prec_level")) {
char *error = str_to_u8(value, name, &band->prec_level);
if (error) {
return error;
}
} else {
return xasprintf("unknown keyword %s", name);
}
}
/* validate bands */
if (!n_bands) {
return xstrdup("meter must have bands");
}
mm->meter.n_bands = n_bands;
mm->meter.bands = ofpbuf_steal_data(bands);
for (i = 0; i < n_bands; ++i) {
band = &mm->meter.bands[i];
if (!band->type) {
return xstrdup("band must have 'type'");
}
if (band->type == OFPMBT13_DSCP_REMARK) {
if (!band->prec_level) {
return xstrdup("'dscp_remark' band must have"
" 'prec_level'");
}
} else {
if (band->prec_level) {
return xstrdup("Only 'dscp_remark' band may have"
" 'prec_level'");
}
}
if (!band->rate) {
return xstrdup("band must have 'rate'");
}
if (mm->meter.flags & OFPMF13_BURST) {
if (!band->burst_size) {
return xstrdup("band must have 'burst_size' "
"when 'burst' flag is set");
}
} else {
if (band->burst_size) {
return xstrdup("band may have 'burst_size' only "
"when 'burst' flag is set");
}
}
}
} else {
mm->meter.n_bands = 0;
mm->meter.bands = NULL;
}
return NULL;
}
/* Convert 'str_' (as described in the Flow Syntax section of the ovs-ofctl man
* page) into 'mm' for sending the specified meter_mod 'command' to a switch.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
parse_ofp_meter_mod_str(struct ofputil_meter_mod *mm, const char *str_,
int command, enum ofputil_protocol *usable_protocols)
{
struct ofpbuf bands;
char *string;
char *error;
ofpbuf_init(&bands, 64);
string = xstrdup(str_);
error = parse_ofp_meter_mod_str__(mm, string, &bands, command,
usable_protocols);
free(string);
ofpbuf_uninit(&bands);
return error;
}
static char * OVS_WARN_UNUSED_RESULT
parse_flow_monitor_request__(struct ofputil_flow_monitor_request *fmr,
const char *str_, char *string,
enum ofputil_protocol *usable_protocols)
{
static atomic_count id = ATOMIC_COUNT_INIT(0);
char *name, *value;
fmr->id = atomic_count_inc(&id);
fmr->flags = (NXFMF_INITIAL | NXFMF_ADD | NXFMF_DELETE | NXFMF_MODIFY
| NXFMF_OWN | NXFMF_ACTIONS);
fmr->out_port = OFPP_NONE;
fmr->table_id = 0xff;
match_init_catchall(&fmr->match);
while (ofputil_parse_key_value(&string, &name, &value)) {
const struct protocol *p;
char *error = NULL;
if (!strcmp(name, "!initial")) {
fmr->flags &= ~NXFMF_INITIAL;
} else if (!strcmp(name, "!add")) {
fmr->flags &= ~NXFMF_ADD;
} else if (!strcmp(name, "!delete")) {
fmr->flags &= ~NXFMF_DELETE;
} else if (!strcmp(name, "!modify")) {
fmr->flags &= ~NXFMF_MODIFY;
} else if (!strcmp(name, "!actions")) {
fmr->flags &= ~NXFMF_ACTIONS;
} else if (!strcmp(name, "!own")) {
fmr->flags &= ~NXFMF_OWN;
} else if (parse_protocol(name, &p)) {
match_set_dl_type(&fmr->match, htons(p->dl_type));
if (p->nw_proto) {
match_set_nw_proto(&fmr->match, p->nw_proto);
}
} else if (mf_from_name(name)) {
error = parse_field(mf_from_name(name), value, &fmr->match,
usable_protocols);
} else {
if (!*value) {
return xasprintf("%s: field %s missing value", str_, name);
}
if (!strcmp(name, "table")) {
error = str_to_u8(value, "table", &fmr->table_id);
} else if (!strcmp(name, "out_port")) {
fmr->out_port = u16_to_ofp(atoi(value));
} else {
return xasprintf("%s: unknown keyword %s", str_, name);
}
}
if (error) {
return error;
}
}
return NULL;
}
/* Convert 'str_' (as described in the documentation for the "monitor" command
* in the ovs-ofctl man page) into 'fmr'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
parse_flow_monitor_request(struct ofputil_flow_monitor_request *fmr,
const char *str_,
enum ofputil_protocol *usable_protocols)
{
char *string = xstrdup(str_);
char *error = parse_flow_monitor_request__(fmr, str_, string,
usable_protocols);
free(string);
return error;
}
/* Parses 'string' as an OFPT_FLOW_MOD or NXT_FLOW_MOD with command 'command'
* (one of OFPFC_*) into 'fm'.
*
* If 'command' is given as -2, 'string' may begin with a command name ("add",
* "modify", "delete", "modify_strict", or "delete_strict"). A missing command
* name is treated as "add".
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
parse_ofp_flow_mod_str(struct ofputil_flow_mod *fm, const char *string,
int command,
enum ofputil_protocol *usable_protocols)
{
char *error = parse_ofp_str(fm, command, string, usable_protocols);
if (!error) {
/* Normalize a copy of the match. This ensures that non-normalized
* flows get logged but doesn't affect what gets sent to the switch, so
* that the switch can do whatever it likes with the flow. */
struct match match_copy = fm->match;
ofputil_normalize_match(&match_copy);
}
return error;
}
/* Convert 'table_id' and 'setting' (as described for the "mod-table" command
* in the ovs-ofctl man page) into 'tm' for sending a table_mod command to a
* switch.
*
* Stores a bitmap of the OpenFlow versions that are usable for 'tm' into
* '*usable_versions'.
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
parse_ofp_table_mod(struct ofputil_table_mod *tm, const char *table_id,
const char *setting, uint32_t *usable_versions)
{
*usable_versions = 0;
if (!strcasecmp(table_id, "all")) {
tm->table_id = OFPTT_ALL;
} else {
char *error = str_to_u8(table_id, "table_id", &tm->table_id);
if (error) {
return error;
}
}
tm->miss = OFPUTIL_TABLE_MISS_DEFAULT;
tm->eviction = OFPUTIL_TABLE_EVICTION_DEFAULT;
tm->eviction_flags = UINT32_MAX;
/* Only OpenFlow 1.1 and 1.2 can configure table-miss via table_mod.
* Only OpenFlow 1.4+ can configure eviction via table_mod.
*
* (OpenFlow 1.4+ can also configure vacancy events via table_mod, but OVS
* doesn't support those yet and they're also logically a per-OpenFlow
* session setting so it wouldn't make sense to support them here anyway.)
*/
if (!strcmp(setting, "controller")) {
tm->miss = OFPUTIL_TABLE_MISS_CONTROLLER;
*usable_versions = (1u << OFP11_VERSION) | (1u << OFP12_VERSION);
} else if (!strcmp(setting, "continue")) {
tm->miss = OFPUTIL_TABLE_MISS_CONTINUE;
*usable_versions = (1u << OFP11_VERSION) | (1u << OFP12_VERSION);
} else if (!strcmp(setting, "drop")) {
tm->miss = OFPUTIL_TABLE_MISS_DROP;
*usable_versions = (1u << OFP11_VERSION) | (1u << OFP12_VERSION);
} else if (!strcmp(setting, "evict")) {
tm->eviction = OFPUTIL_TABLE_EVICTION_ON;
*usable_versions = (1 << OFP14_VERSION) | (1u << OFP15_VERSION);
} else if (!strcmp(setting, "noevict")) {
tm->eviction = OFPUTIL_TABLE_EVICTION_OFF;
*usable_versions = (1 << OFP14_VERSION) | (1u << OFP15_VERSION);
} else {
return xasprintf("invalid table_mod setting %s", setting);
}
if (tm->table_id == 0xfe
&& tm->miss == OFPUTIL_TABLE_MISS_CONTINUE) {
return xstrdup("last table's flow miss handling can not be continue");
}
return NULL;
}
/* Opens file 'file_name' and reads each line as a flow_mod of the specified
* type (one of OFPFC_*). Stores each flow_mod in '*fm', an array allocated
* on the caller's behalf, and the number of flow_mods in '*n_fms'.
*
* If 'command' is given as -2, each line may start with a command name
* ("add", "modify", "delete", "modify_strict", or "delete_strict"). A missing
* command name is treated as "add".
*
* Returns NULL if successful, otherwise a malloc()'d string describing the
* error. The caller is responsible for freeing the returned string. */
char * OVS_WARN_UNUSED_RESULT
parse_ofp_flow_mod_file(const char *file_name, int command,
struct ofputil_flow_mod **fms, size_t *n_fms,
enum ofputil_protocol *usable_protocols)
{
size_t allocated_fms;
int line_number;
FILE *stream;
struct ds s;
*usable_protocols = OFPUTIL_P_ANY;
*fms = NULL;
*n_fms = 0;
stream = !strcmp(file_name, "-") ? stdin : fopen(file_name, "r");
if (stream == NULL) {
return xasprintf("%s: open failed (%s)",
file_name, ovs_strerror(errno));
}
allocated_fms = *n_fms;
ds_init(&s);
line_number = 0;
while (!ds_get_preprocessed_line(&s, stream, &line_number)) {
char *error;
enum ofputil_protocol usable;
if (*n_fms >= allocated_fms) {
*fms = x2nrealloc(*fms, &allocated_fms, sizeof **fms);
}
error = parse_ofp_flow_mod_str(&(*fms)[*n_fms], ds_cstr(&s), command,
&usable);
if (error) {
size_t i;
for (i = 0; i < *n_fms; i++) {
free(CONST_CAST(struct ofpact *, (*fms)[i].ofpacts));
}
free(*fms);
*fms = NULL;
*n_fms = 0;
ds_destroy(&s);
if (stream != stdin) {
fclose(stream);
}
return xasprintf("%s:%d: %s", file_name, line_number, error);
}
*usable_protocols &= usable; /* Each line can narrow the set. */
*n_fms += 1;
}
ds_destroy(&s);
if (stream != stdin) {
fclose(stream);
}
return NULL;
}