-
Notifications
You must be signed in to change notification settings - Fork 28
/
dd.c
1316 lines (1100 loc) · 31.8 KB
/
dd.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
/*
* Handle DD registration/deregistration
*
* Discovery domains are weird, even in the context of
* iSNS. For one thing, all other objects have unique
* attributes; DDs attributes can appear several times.
* They should really have made each DD member an object
* in its own right.
*
* Copyright (C) 2007 Olaf Kirch <[email protected]>
*/
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include <libisns/isns.h>
#include <libisns/attrs.h>
#include "objects.h"
#include <libisns/message.h>
#include "security.h"
#include <libisns/util.h>
#include "db.h"
#define DD_DEBUG
enum {
ISNS_DD_MEMBER_ISCSI_NODE = 1,
ISNS_DD_MEMBER_IFCP_NODE,
ISNS_DD_MEMBER_PORTAL,
};
/* Must be zero/one: */
enum {
NOTIFY_MEMBER_ADDED = 0,
NOTIFY_MEMBER_REMOVED = 1
};
typedef struct isns_dd isns_dd_t;
typedef struct isns_dd_list isns_dd_list_t;
typedef struct isns_dd_member isns_dd_member_t;
struct isns_dd {
uint32_t dd_id;
char * dd_name;
uint32_t dd_features;
isns_dd_member_t * dd_members;
unsigned int dd_inserted : 1;
isns_object_t * dd_object;
};
struct isns_dd_member {
isns_dd_member_t * ddm_next;
unsigned int ddm_type;
isns_object_ref_t ddm_object;
unsigned int ddm_added : 1;
union {
uint32_t ddm_index;
/* Index must be first in all structs below.
* Yeah, I know. Aliasing is bad. */
struct isns_dd_portal {
uint32_t index;
isns_portal_info_t info;
} ddm_portal;
struct isns_dd_iscsi_node {
uint32_t index;
char * name;
} ddm_iscsi_node;
struct isns_dd_ifcp_node {
uint32_t index;
char * name;
} ddm_ifcp_node;
};
};
struct isns_dd_list {
unsigned int ddl_count;
isns_dd_t ** ddl_data;
};
/*
* List of all discovery domains.
* This duplicates the DD information from the database,
* but unfortunately this can't be helped - we need to
* have fast algorithms to compute the membership of a
* node, and the relative visibility of two nodes.
*/
static int isns_dd_list_initialized = 0;
static isns_dd_list_t isns_dd_list;
static uint32_t isns_dd_next_id = 1;
static isns_dd_t * isns_dd_alloc(void);
static isns_dd_t * isns_dd_clone(const isns_dd_t *);
static void isns_dd_release(isns_dd_t *);
static int isns_dd_parse_attrs(isns_dd_t *,
isns_db_t *, const isns_attr_list_t *,
const isns_dd_t *, int);
static int isns_dd_remove_members(isns_dd_t *,
isns_db_t *,
isns_dd_t *);
static void isns_dd_notify(const isns_dd_t *,
isns_dd_member_t *,
isns_dd_member_t *,
int);
static void isns_dd_add_members(isns_dd_t *,
isns_db_t *,
isns_dd_t *);
static void isns_dd_store(isns_db_t *, const isns_dd_t *, int);
static void isns_dd_destroy(isns_db_t *, isns_dd_t *);
static void isns_dd_insert(isns_dd_t *);
static isns_dd_t * isns_dd_by_id(uint32_t);
static isns_dd_t * isns_dd_by_name(const char *);
static isns_dd_member_t * isns_dd_create_member(isns_object_t *);
static inline void isns_dd_member_free(isns_dd_member_t *);
static int isns_dd_remove_member(isns_dd_t *, isns_object_t *);
static void isns_dd_list_resize(isns_dd_list_t *, unsigned int);
static void isns_dd_list_insert(isns_dd_list_t *, isns_dd_t *);
static void isns_dd_list_remove(isns_dd_list_t *, isns_dd_t *);
static isns_object_t * isns_dd_get_member_object(isns_db_t *,
const isns_attr_t *, const isns_attr_t *,
int);
/*
* Create DDReg messages
*/
isns_simple_t *
isns_create_dd_registration(isns_client_t *clnt, const isns_attr_list_t *attrs)
{
isns_simple_t *msg;
isns_attr_t *id_attr;
msg = isns_simple_create(ISNS_DD_REGISTER, clnt->ic_source, NULL);
if (msg == NULL)
return NULL;
/* If the caller specified a DD_ID, use it in the
* message key. */
if (isns_attr_list_get_attr(attrs, ISNS_TAG_DD_ID, &id_attr))
isns_attr_list_append_attr(&msg->is_message_attrs, id_attr);
isns_attr_list_copy(&msg->is_operating_attrs, attrs);
return msg;
}
isns_simple_t *
isns_create_dd_deregistration(isns_client_t *clnt,
uint32_t dd_id, const isns_attr_list_t *attrs)
{
isns_simple_t *msg;
msg = isns_simple_create(ISNS_DD_DEREGISTER, clnt->ic_source, NULL);
if (msg == NULL)
return NULL;
isns_attr_list_append_uint32(&msg->is_message_attrs,
ISNS_TAG_DD_ID, dd_id);
isns_attr_list_copy(&msg->is_operating_attrs, attrs);
return msg;
}
/*
* Process a DD registration
*/
int
isns_process_dd_registration(isns_server_t *srv, isns_simple_t *call, isns_simple_t **result)
{
isns_simple_t *reply = NULL;
isns_attr_list_t *keys = &call->is_message_attrs;
isns_attr_list_t *attrs = &call->is_operating_attrs;
isns_db_t *db = srv->is_db;
isns_dd_t *dd = NULL, *temp_dd = NULL;
isns_attr_t *attr;
uint32_t id = 0;
int status;
/*
* 5.6.5.9.
* The Message Key, if used, contains the DD_ID of the Discovery
* Domain to be registered. If the Message Key contains a DD_ID
* of an existing DD entry in the iSNS database, then the DDReg
* message SHALL attempt to update the existing entry. If the
* DD_ID in the Message Key (if used) does not match an existing
* DD entry, then the iSNS server SHALL reject the DDReg message
* with a status code of 3 (Invalid Registration).
*/
switch (keys->ial_count) {
case 0:
/* Security: check if the client is allowed to
* create a discovery domain */
if (!isns_policy_validate_object_creation(call->is_policy,
call->is_source,
&isns_dd_template,
keys, attrs,
call->is_function))
goto unauthorized;
break;
case 1:
attr = keys->ial_data[0];
if (attr->ia_tag_id != ISNS_TAG_DD_ID)
goto reject;
if (ISNS_ATTR_IS_NIL(attr))
break;
if (!ISNS_ATTR_IS_UINT32(attr))
goto reject;
id = attr->ia_value.iv_uint32;
if (id == 0)
goto reject;
dd = isns_dd_by_id(id);
if (dd == NULL) {
isns_debug_state("DDReg for unknown ID=%u\n", id);
goto reject;
}
/* Security: check if the client is allowed to
* mess with this DD. */
isns_assert(dd->dd_object);
if (!isns_policy_validate_object_update(call->is_policy,
call->is_source,
dd->dd_object, attrs,
call->is_function))
goto unauthorized;
break;
default:
goto reject;
}
temp_dd = isns_dd_alloc();
/* Parse the attributes and build a DD object. */
status = isns_dd_parse_attrs(temp_dd, db, attrs, dd, 1);
if (status != ISNS_SUCCESS)
goto out;
if (dd == NULL) {
/* Create the DD, and copy the general information
* such asn features and symbolic name from temp_dd */
dd = isns_dd_clone(temp_dd);
/* Don't assign the attrs to the DD right away.
* First and foremost, they may be unsorted. Second,
* we really want to hand-pick through them due to
* the weird semantics mandated by the RFC. */
dd->dd_object = isns_create_object(&isns_dd_template, NULL, NULL);
if (dd->dd_object == NULL)
goto reject;
/* Insert new domain into database */
isns_db_insert(db, dd->dd_object);
/* Add it to the internal list. Assign DD_ID and
* symbolic name if none were given.
*/
isns_dd_insert(dd);
} else {
if (!dd->dd_id)
dd->dd_id = temp_dd->dd_id;
dd->dd_features = temp_dd->dd_features;
isns_assign_string(&dd->dd_name, temp_dd->dd_name);
}
/* Send notifications. This must be done before merging
* the list of new members into the DD.
*/
isns_dd_notify(dd, dd->dd_members, temp_dd->dd_members,
NOTIFY_MEMBER_ADDED);
/* Update the DD */
isns_dd_add_members(dd, db, temp_dd);
/* And add it to the database. */
isns_dd_store(db, dd, 0);
reply = isns_simple_create(ISNS_DD_REGISTER, srv->is_source, NULL);
isns_object_extract_all(dd->dd_object, &reply->is_operating_attrs);
status = ISNS_SUCCESS;
out:
isns_dd_release(temp_dd);
isns_dd_release(dd);
*result = reply;
return status;
reject:
status = ISNS_INVALID_REGISTRATION;
goto out;
unauthorized:
status = ISNS_SOURCE_UNAUTHORIZED;
goto out;
}
/*
* Process a DD deregistration
*/
int
isns_process_dd_deregistration(isns_server_t *srv, isns_simple_t *call, isns_simple_t **result)
{
isns_simple_t *reply = NULL;
isns_attr_list_t *keys = &call->is_message_attrs;
isns_attr_list_t *attrs = &call->is_operating_attrs;
isns_db_t *db = srv->is_db;
isns_dd_t *dd = NULL, *temp_dd = NULL;
isns_attr_t *attr;
uint32_t id = 0;
int status;
/*
* 5.6.5.10.
* The Message Key Attribute for a DDDereg message is the DD
* ID for the Discovery Domain being removed or having members
* removed.
*/
if (keys->ial_count != 1)
goto reject;
attr = keys->ial_data[0];
if (attr->ia_tag_id != ISNS_TAG_DD_ID
|| ISNS_ATTR_IS_NIL(attr)
|| !ISNS_ATTR_IS_UINT32(attr))
goto reject;
id = attr->ia_value.iv_uint32;
if (id == 0)
goto reject;
dd = isns_dd_by_id(id);
if (dd == NULL)
goto reject;
/* Security: check if the client is permitted to
* modify the DD object.
*/
if (!isns_policy_validate_object_update(call->is_policy,
call->is_source,
dd->dd_object, attrs,
call->is_function))
goto unauthorized;
/*
* 5.6.5.10.
* If the DD ID matches an existing DD and there are
* no Operating Attributes, then the DD SHALL be removed and a
* success Status Code returned. Any existing members of that
* DD SHALL remain in the iSNS database without membership in
* the just-removed DD.
*/
if (attrs->ial_count == 0) {
isns_dd_member_t *mp;
/* Zap the membership bit */
for (mp = dd->dd_members; mp; mp = mp->ddm_next) {
isns_object_t *obj = mp->ddm_object.obj;
isns_object_clear_membership(obj, dd->dd_id);
}
/* Notify all DD members that they will lose the other
* nodes. */
isns_dd_notify(dd, NULL, dd->dd_members, NOTIFY_MEMBER_REMOVED);
isns_dd_destroy(db, dd);
} else {
/* Parse the attributes and build a temporary DD object. */
temp_dd = isns_dd_alloc();
status = isns_dd_parse_attrs(temp_dd, db, attrs, dd, 0);
if (status != ISNS_SUCCESS)
goto out;
/* Update the DD object */
status = isns_dd_remove_members(dd, db, temp_dd);
if (status != ISNS_SUCCESS)
goto out;
/* Send notifications. This must be done before
* updating the DD.
*/
isns_dd_notify(dd, dd->dd_members, temp_dd->dd_members,
NOTIFY_MEMBER_REMOVED);
/* Store it in the database. */
isns_dd_store(db, dd, 1);
}
reply = isns_simple_create(ISNS_DD_DEREGISTER, srv->is_source, NULL);
status = ISNS_SUCCESS;
out:
isns_dd_release(temp_dd);
isns_dd_release(dd);
*result = reply;
return status;
reject:
status = ISNS_INVALID_DEREGISTRATION;
goto out;
unauthorized:
status = ISNS_SOURCE_UNAUTHORIZED;
goto out;
}
static isns_dd_t *
isns_dd_alloc(void)
{
return isns_calloc(1, sizeof(isns_dd_t));
}
/*
* Allocate a clone of the orig_dd, but without
* copying the members.
*/
static isns_dd_t *
isns_dd_clone(const isns_dd_t *orig_dd)
{
isns_dd_t *dd;
dd = isns_dd_alloc();
dd->dd_id = orig_dd->dd_id;
dd->dd_features = orig_dd->dd_features;
dd->dd_object = isns_object_get(orig_dd->dd_object);
isns_assign_string(&dd->dd_name, orig_dd->dd_name);
return dd;
}
static void
isns_dd_release(isns_dd_t *dd)
{
isns_dd_member_t *member;
if (dd == NULL || dd->dd_inserted)
return;
while ((member = dd->dd_members) != NULL) {
dd->dd_members = member->ddm_next;
isns_dd_member_free(member);
}
if (dd->dd_object)
isns_object_release(dd->dd_object);
isns_free(dd->dd_name);
isns_free(dd);
}
static isns_dd_member_t *
isns_dd_create_member(isns_object_t *obj)
{
isns_dd_member_t *new;
new = isns_calloc(1, sizeof(*new));
new->ddm_added = 1;
if (ISNS_IS_ISCSI_NODE(obj))
new->ddm_type = ISNS_DD_MEMBER_ISCSI_NODE;
else if (ISNS_IS_PORTAL(obj))
new->ddm_type = ISNS_DD_MEMBER_PORTAL;
else if (ISNS_IS_FC_NODE(obj))
new->ddm_type = ISNS_DD_MEMBER_IFCP_NODE;
else {
isns_free(new);
return NULL;
}
isns_object_reference_set(&new->ddm_object, obj);
return new;
}
static inline void
isns_dd_member_free(isns_dd_member_t *member)
{
switch (member->ddm_type) {
case ISNS_DD_MEMBER_ISCSI_NODE:
isns_free(member->ddm_iscsi_node.name);
break;
case ISNS_DD_MEMBER_IFCP_NODE:
isns_free(member->ddm_ifcp_node.name);
break;
}
isns_object_reference_drop(&member->ddm_object);
isns_free(member);
}
void
isns_dd_get_members(uint32_t dd_id, isns_object_list_t *list, int active_only)
{
isns_dd_t *dd;
isns_dd_member_t *mp;
dd = isns_dd_by_id(dd_id);
if (dd == NULL)
return;
for (mp = dd->dd_members; mp; mp = mp->ddm_next) {
isns_object_t *obj = mp->ddm_object.obj;
if (active_only
&& obj->ie_state != ISNS_OBJECT_STATE_MATURE)
continue;
isns_object_list_append(list, obj);
}
}
/*
* Helper function to remove a member referencing the given object
*/
static int
isns_dd_remove_member(isns_dd_t *dd, isns_object_t *obj)
{
isns_dd_member_t *mp, **pos;
pos = &dd->dd_members;
while ((mp = *pos) != NULL) {
if (mp->ddm_object.obj == obj) {
*pos = mp->ddm_next;
isns_dd_member_free(mp);
return 1;
} else {
pos = &mp->ddm_next;
}
}
return 0;
}
static void
isns_dd_insert(isns_dd_t *dd)
{
if (dd->dd_inserted)
return;
if (dd->dd_id == 0) {
uint32_t id = isns_dd_next_id;
unsigned int i;
for (i = 0; i < isns_dd_list.ddl_count; ++i) {
isns_dd_t *cur = isns_dd_list.ddl_data[i];
if (cur->dd_id > id)
break;
if (cur->dd_id == id)
++id;
}
isns_debug_state("Allocated new DD_ID %d\n", id);
dd->dd_id = id;
isns_dd_next_id = id + 1;
}
/*
* When creating a new DD, if the DD_Symbolic_Name is
* not included in the Operating Attributes, or if it
* is included with a zero-length TLV, then the iSNS
* server SHALL provide a unique DD_Symbolic_Name value
* for the created DD. The assigned DD_Symbolic_Name
* value SHALL be returned in the DDRegRsp message.
*/
if (dd->dd_name == NULL) {
char namebuf[64];
snprintf(namebuf, sizeof(namebuf), "isns.dd%u", dd->dd_id);
isns_assign_string(&dd->dd_name, namebuf);
}
isns_dd_list_insert(&isns_dd_list, dd);
dd->dd_inserted = 1;
#ifdef DD_DEBUG
/* Safety first - make sure domains are sorted by DD_ID */
{
unsigned int i, prev_id = 0;
for (i = 0; i < isns_dd_list.ddl_count; ++i) {
isns_dd_t *cur = isns_dd_list.ddl_data[i];
isns_assert(cur->dd_id > prev_id);
prev_id = cur->dd_id;
}
}
#endif
}
/*
* Resize the DD list
*/
#define LIST_SIZE(n) (((n) + 15) & ~15)
void
isns_dd_list_resize(isns_dd_list_t *list, unsigned int last_index)
{
unsigned int new_size;
isns_dd_t **new_data;
new_size = LIST_SIZE(last_index + 1);
if (new_size < list->ddl_count)
return;
/* We don't use realloc here because we need
* to zero the new pointers anyway. */
new_data = isns_calloc(new_size, sizeof(void *));
isns_assert(new_data);
memcpy(new_data, list->ddl_data,
list->ddl_count * sizeof(void *));
isns_free(list->ddl_data);
list->ddl_data = new_data;
list->ddl_count = last_index + 1;
}
/*
* Find the insert position for a given DD ID.
* returns true iff the DD was found in the list.
*/
static int
__isns_dd_list_find_pos(isns_dd_list_t *list, unsigned int id,
unsigned int *where)
{
unsigned int hi, lo, md;
lo = 0;
hi = list->ddl_count;
/* binary search */
while (lo < hi) {
isns_dd_t *cur;
md = (lo + hi) / 2;
cur = list->ddl_data[md];
if (id == cur->dd_id) {
*where = md;
return 1;
}
if (id < cur->dd_id) {
hi = md;
} else {
lo = md + 1;
}
}
*where = hi;
return 0;
}
/*
* In-order insert
*/
static void
isns_dd_list_insert(isns_dd_list_t *list, isns_dd_t *dd)
{
unsigned int pos;
if (__isns_dd_list_find_pos(list, dd->dd_id, &pos)) {
isns_error("Internal error in %s: DD already listed\n",
__FUNCTION__);
return;
}
isns_dd_list_resize(list, list->ddl_count);
/* Shift the tail of the list to make room for new entry. */
memmove(list->ddl_data + pos + 1,
list->ddl_data + pos,
(list->ddl_count - pos - 1) * sizeof(void *));
list->ddl_data[pos] = dd;
}
/*
* Remove DD from list
*/
void
isns_dd_list_remove(isns_dd_list_t *list, isns_dd_t *dd)
{
unsigned int pos;
if (!__isns_dd_list_find_pos(list, dd->dd_id, &pos))
return;
/* Shift the tail of the list */
memmove(list->ddl_data + pos,
list->ddl_data + pos + 1,
(list->ddl_count - pos - 1) * sizeof(void *));
list->ddl_count -= 1;
}
isns_dd_t *
isns_dd_by_id(uint32_t id)
{
unsigned int i;
for (i = 0; i < isns_dd_list.ddl_count; ++i) {
isns_dd_t *dd = isns_dd_list.ddl_data[i];
if (dd && dd->dd_id == id)
return dd;
}
return NULL;
}
static isns_dd_t *
isns_dd_by_name(const char *name)
{
unsigned int i;
for (i = 0; i < isns_dd_list.ddl_count; ++i) {
isns_dd_t *dd = isns_dd_list.ddl_data[i];
if (dd && !strcmp(dd->dd_name, name))
return dd;
}
return NULL;
}
/*
* Validate the operating attributes, which is surprisingly
* tedious for DDs. It appears as if the whole DD/DDset
* stuff has been slapped onto iSNS as an afterthought.
*
* DDReg has some funky rules about how eg iSCSI nodes
* can be identified by either name or index, and how they
* relate to each other. Unfortunately, the RFC is very vague
* in describing how to treat DDReg message that mix these
* two types of identification, except by saying they
* need to be consistent.
*/
static int
isns_dd_parse_attrs(isns_dd_t *dd, isns_db_t *db,
const isns_attr_list_t *attrs,
const isns_dd_t *orig_dd,
int is_registration)
{
isns_dd_member_t **tail;
const isns_dd_t *conflict;
unsigned int i;
int rv = ISNS_SUCCESS;
if (orig_dd) {
dd->dd_id = orig_dd->dd_id;
dd->dd_features = orig_dd->dd_features;
isns_assign_string(&dd->dd_name, orig_dd->dd_name);
}
isns_assert(dd->dd_members == NULL);
tail = &dd->dd_members;
for (i = 0; i < attrs->ial_count; ++i) {
isns_object_t *obj = NULL;
isns_attr_t *attr, *next = NULL;
const char *name;
uint32_t id;
attr = attrs->ial_data[i];
if (!isns_object_attr_valid(&isns_dd_template, attr->ia_tag_id))
return ISNS_INVALID_REGISTRATION;
switch (attr->ia_tag_id) {
case ISNS_TAG_DD_ID:
/* Ignore this attribute in DDDereg messages */
if (!is_registration)
continue;
/*
* 5.6.5.9.
* A DDReg message with no Message Key SHALL result
* in the attempted creation of a new Discovery Domain
* (DD). If the DD_ID attribute (with non-zero length)
* is included among the Operating Attributes in the
* DDReg message, then the new Discovery Domain SHALL be
* assigned the value contained in that DD_ID attribute.
*
* If the DD_ID is included in both the Message
* Key and Operating Attributes, then the DD_ID
* value in the Message Key MUST be the same as
* the DD_ID value in the Operating Attributes.
*
* Implementer's note: It's not clear why the standard
* makes an exception for the DD_ID, while all other
* index attributes are read-only.
*/
if (ISNS_ATTR_IS_NIL(attr))
break;
id = attr->ia_value.iv_uint32;
if (dd->dd_id != 0) {
if (dd->dd_id != id)
goto invalid;
} else if ((conflict = isns_dd_by_id(id)) != NULL) {
isns_debug_state("DDReg: requested ID %d "
"clashes with existing DD (%s)\n",
id, conflict->dd_name);
goto invalid;
}
dd->dd_id = id;
break;
case ISNS_TAG_DD_SYMBOLIC_NAME:
/* Ignore this attribute in DDDereg messages */
if (!is_registration)
continue;
/*
* If the DD_Symbolic_Name is an operating
* attribute and its value is unique (i.e., it
* does not match the registered DD_Symbolic_Name
* for another DD), then the value SHALL be stored
* in the iSNS database as the DD_Symbolic_Name
* for the specified Discovery Domain. If the
* value for the DD_Symbolic_Name is not unique,
* then the iSNS server SHALL reject the attempted
* DD registration with a status code of 3
* (Invalid Registration).
*/
if (ISNS_ATTR_IS_NIL(attr))
break;
name = attr->ia_value.iv_string;
if (dd->dd_name && strcmp(name, dd->dd_name)) {
isns_debug_state("DDReg: symbolic name conflict: "
"id=%d name=%s requested=%s\n",
dd->dd_id, dd->dd_name, name);
goto invalid;
}
if (dd->dd_name)
break;
if ((conflict = isns_dd_by_name(name)) != NULL) {
isns_debug_state("DDReg: requested symbolic name (%s) "
"clashes with existing DD (id=%d)\n",
name, conflict->dd_id);
goto invalid;
}
isns_assign_string(&dd->dd_name, name);
break;
case ISNS_TAG_DD_FEATURES:
/* Ignore this attribute in DDDereg messages */
if (!is_registration)
continue;
/*
* When creating a new DD, if the DD_Features
* attribute is not included in the Operating
* Attributes, then the iSNS server SHALL assign
* the default value. The default value for
* DD_Features is 0.
*/
if (ISNS_ATTR_IS_UINT32(attr))
dd->dd_features = attr->ia_value.iv_uint32;
break;
case ISNS_TAG_DD_MEMBER_PORTAL_IP_ADDR:
/* portal address must be followed by port */
if (i + 1 >= attrs->ial_count)
goto invalid;
next = attrs->ial_data[i + 1];
if (next->ia_tag_id != ISNS_TAG_DD_MEMBER_PORTAL_TCP_UDP_PORT)
goto invalid;
i += 1;
/* fallthru to normal case */
case ISNS_TAG_DD_MEMBER_PORTAL_INDEX:
case ISNS_TAG_DD_MEMBER_ISCSI_INDEX:
case ISNS_TAG_DD_MEMBER_ISCSI_NAME:
case ISNS_TAG_DD_MEMBER_FC_PORT_NAME:
if (ISNS_ATTR_IS_NIL(attr))
goto invalid;
obj = isns_dd_get_member_object(db,
attr, next,
is_registration);
/* For a DD deregistration, it's okay if the
* object does not exist. */
if (obj == NULL && is_registration)
goto invalid;
break;
invalid:
rv = ISNS_INVALID_REGISTRATION;
continue;
}
if (obj) {
if (is_registration
&& isns_object_test_membership(obj, dd->dd_id)) {
/* Duplicates are ignored */
isns_debug_state("Ignoring duplicate DD registration "
"for %s %u\n",
obj->ie_template->iot_name,
obj->ie_index);
} else {
/* This just adds the member to the temporary DD object,
* without changing any state in the database. */
isns_dd_member_t *new;
new = isns_dd_create_member(obj);
if (new) {
*tail = new;
tail = &new->ddm_next;
}
/* mark this object as a member of this DD */
isns_object_mark_membership(obj, dd->dd_id);
}
isns_object_release(obj);
}
}
return rv;
}
/*
* Helper function: extract live nodes from the DD member list
*/
static inline void
isns_dd_get_member_nodes(isns_dd_member_t *members, isns_object_list_t *result)
{
isns_dd_member_t *mp;
/* Extract iSCSI nodes from both list. */
for (mp = members; mp; mp = mp->ddm_next) {
isns_object_t *obj = mp->ddm_object.obj;
if (ISNS_IS_ISCSI_NODE(obj)
&& obj->ie_state == ISNS_OBJECT_STATE_MATURE)
isns_object_list_append(result, obj);
}
}
void
isns_dd_notify(const isns_dd_t *dd, isns_dd_member_t *unchanged,
isns_dd_member_t *changed, int removed)
{
isns_object_list_t dd_objects = ISNS_OBJECT_LIST_INIT;
isns_object_list_t changed_objects = ISNS_OBJECT_LIST_INIT;
unsigned int i, j, event;
/* Extract iSCSI nodes from both list. */
isns_dd_get_member_nodes(unchanged, &dd_objects);
isns_dd_get_member_nodes(changed, &changed_objects);
/* Send a management SCN multicast to all
* control nodes that care. */
event = removed? ISNS_SCN_DD_MEMBER_REMOVED_MASK : ISNS_SCN_DD_MEMBER_ADDED_MASK;
for (i = 0; i < changed_objects.iol_count; ++i) {
isns_object_t *obj = changed_objects.iol_data[i];
isns_object_event(obj,
event | ISNS_SCN_MANAGEMENT_REGISTRATION_MASK,
dd->dd_object);
}
#ifdef notagoodidea
/* Not sure - it may be good to send OBJECT ADDED/REMOVED instead
* of the DD membership messages. However, right now the SCN code
* will nuke all SCN registrations for a node when it sees a
* REMOVE event for it.
*/
event = removed? ISNS_SCN_OBJECT_REMOVED_MASK : ISNS_SCN_OBJECT_ADDED_MASK;
#endif
/* If we added an iscsi node, loop over all members
* and send unicast events to each iscsi node,
* informing them that a new member has been added/removed.
*/
for (j = 0; j < changed_objects.iol_count; ++j) {
isns_object_t *changed = changed_objects.iol_data[j];
for (i = 0; i < dd_objects.iol_count; ++i) {
isns_object_t *obj = dd_objects.iol_data[i];
/* For member removal, do not send notifications
* if the two nodes are still visible to each
* other through a different discovery domain */
if (removed && isns_object_test_visibility(obj, changed))
continue;
/* Inform the old node that the new node was
* added/removed. */
isns_unicast_event(obj, changed, event, NULL);
/* Inform the new node that the old node became
* (in)accessible to it. */