forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathsmc_clc.c
1351 lines (1222 loc) · 36.9 KB
/
smc_clc.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
// SPDX-License-Identifier: GPL-2.0
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* CLC (connection layer control) handshake over initial TCP socket to
* prepare for RDMA traffic
*
* Copyright IBM Corp. 2016, 2018
*
* Author(s): Ursula Braun <[email protected]>
*/
#include <linux/in.h>
#include <linux/inetdevice.h>
#include <linux/if_ether.h>
#include <linux/sched/signal.h>
#include <linux/utsname.h>
#include <linux/ctype.h>
#include <net/addrconf.h>
#include <net/sock.h>
#include <net/tcp.h>
#include "smc.h"
#include "smc_core.h"
#include "smc_clc.h"
#include "smc_ib.h"
#include "smc_ism.h"
#include "smc_netlink.h"
#define SMCR_CLC_ACCEPT_CONFIRM_LEN 68
#define SMCD_CLC_ACCEPT_CONFIRM_LEN 48
#define SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 78
#define SMCR_CLC_ACCEPT_CONFIRM_LEN_V2 108
#define SMC_CLC_RECV_BUF_LEN 100
/* eye catcher "SMCR" EBCDIC for CLC messages */
static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'};
/* eye catcher "SMCD" EBCDIC for CLC messages */
static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'};
static u8 smc_hostname[SMC_MAX_HOSTNAME_LEN];
struct smc_clc_eid_table {
rwlock_t lock;
struct list_head list;
u8 ueid_cnt;
u8 seid_enabled;
};
static struct smc_clc_eid_table smc_clc_eid_table;
struct smc_clc_eid_entry {
struct list_head list;
u8 eid[SMC_MAX_EID_LEN];
};
/* The size of a user EID is 32 characters.
* Valid characters should be (single-byte character set) A-Z, 0-9, '.' and '-'.
* Blanks should only be used to pad to the expected size.
* First character must be alphanumeric.
*/
static bool smc_clc_ueid_valid(char *ueid)
{
char *end = ueid + SMC_MAX_EID_LEN;
while (--end >= ueid && isspace(*end))
;
if (end < ueid)
return false;
if (!isalnum(*ueid) || islower(*ueid))
return false;
while (ueid <= end) {
if ((!isalnum(*ueid) || islower(*ueid)) && *ueid != '.' &&
*ueid != '-')
return false;
ueid++;
}
return true;
}
static int smc_clc_ueid_add(char *ueid)
{
struct smc_clc_eid_entry *new_ueid, *tmp_ueid;
int rc;
if (!smc_clc_ueid_valid(ueid))
return -EINVAL;
/* add a new ueid entry to the ueid table if there isn't one */
new_ueid = kzalloc(sizeof(*new_ueid), GFP_KERNEL);
if (!new_ueid)
return -ENOMEM;
memcpy(new_ueid->eid, ueid, SMC_MAX_EID_LEN);
write_lock(&smc_clc_eid_table.lock);
if (smc_clc_eid_table.ueid_cnt >= SMC_MAX_UEID) {
rc = -ERANGE;
goto err_out;
}
list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) {
if (!memcmp(tmp_ueid->eid, ueid, SMC_MAX_EID_LEN)) {
rc = -EEXIST;
goto err_out;
}
}
list_add_tail(&new_ueid->list, &smc_clc_eid_table.list);
smc_clc_eid_table.ueid_cnt++;
write_unlock(&smc_clc_eid_table.lock);
return 0;
err_out:
write_unlock(&smc_clc_eid_table.lock);
kfree(new_ueid);
return rc;
}
int smc_clc_ueid_count(void)
{
int count;
read_lock(&smc_clc_eid_table.lock);
count = smc_clc_eid_table.ueid_cnt;
read_unlock(&smc_clc_eid_table.lock);
return count;
}
int smc_nl_add_ueid(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY];
char *ueid;
if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1)
return -EINVAL;
ueid = (char *)nla_data(nla_ueid);
return smc_clc_ueid_add(ueid);
}
/* remove one or all ueid entries from the table */
static int smc_clc_ueid_remove(char *ueid)
{
struct smc_clc_eid_entry *lst_ueid, *tmp_ueid;
int rc = -ENOENT;
/* remove table entry */
write_lock(&smc_clc_eid_table.lock);
list_for_each_entry_safe(lst_ueid, tmp_ueid, &smc_clc_eid_table.list,
list) {
if (!ueid || !memcmp(lst_ueid->eid, ueid, SMC_MAX_EID_LEN)) {
list_del(&lst_ueid->list);
smc_clc_eid_table.ueid_cnt--;
kfree(lst_ueid);
rc = 0;
}
}
#if IS_ENABLED(CONFIG_S390)
if (!rc && !smc_clc_eid_table.ueid_cnt) {
smc_clc_eid_table.seid_enabled = 1;
rc = -EAGAIN; /* indicate success and enabling of seid */
}
#endif
write_unlock(&smc_clc_eid_table.lock);
return rc;
}
int smc_nl_remove_ueid(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY];
char *ueid;
if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1)
return -EINVAL;
ueid = (char *)nla_data(nla_ueid);
return smc_clc_ueid_remove(ueid);
}
int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info)
{
smc_clc_ueid_remove(NULL);
return 0;
}
static int smc_nl_ueid_dumpinfo(struct sk_buff *skb, u32 portid, u32 seq,
u32 flags, char *ueid)
{
char ueid_str[SMC_MAX_EID_LEN + 1];
void *hdr;
hdr = genlmsg_put(skb, portid, seq, &smc_gen_nl_family,
flags, SMC_NETLINK_DUMP_UEID);
if (!hdr)
return -ENOMEM;
memcpy(ueid_str, ueid, SMC_MAX_EID_LEN);
ueid_str[SMC_MAX_EID_LEN] = 0;
if (nla_put_string(skb, SMC_NLA_EID_TABLE_ENTRY, ueid_str)) {
genlmsg_cancel(skb, hdr);
return -EMSGSIZE;
}
genlmsg_end(skb, hdr);
return 0;
}
static int _smc_nl_ueid_dump(struct sk_buff *skb, u32 portid, u32 seq,
int start_idx)
{
struct smc_clc_eid_entry *lst_ueid;
int idx = 0;
read_lock(&smc_clc_eid_table.lock);
list_for_each_entry(lst_ueid, &smc_clc_eid_table.list, list) {
if (idx++ < start_idx)
continue;
if (smc_nl_ueid_dumpinfo(skb, portid, seq, NLM_F_MULTI,
lst_ueid->eid)) {
--idx;
break;
}
}
read_unlock(&smc_clc_eid_table.lock);
return idx;
}
int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb)
{
struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
int idx;
idx = _smc_nl_ueid_dump(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, cb_ctx->pos[0]);
cb_ctx->pos[0] = idx;
return skb->len;
}
int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb)
{
struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
char seid_str[SMC_MAX_EID_LEN + 1];
u8 seid_enabled;
void *hdr;
u8 *seid;
if (cb_ctx->pos[0])
return skb->len;
hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
&smc_gen_nl_family, NLM_F_MULTI,
SMC_NETLINK_DUMP_SEID);
if (!hdr)
return -ENOMEM;
if (!smc_ism_is_v2_capable())
goto end;
smc_ism_get_system_eid(&seid);
memcpy(seid_str, seid, SMC_MAX_EID_LEN);
seid_str[SMC_MAX_EID_LEN] = 0;
if (nla_put_string(skb, SMC_NLA_SEID_ENTRY, seid_str))
goto err;
read_lock(&smc_clc_eid_table.lock);
seid_enabled = smc_clc_eid_table.seid_enabled;
read_unlock(&smc_clc_eid_table.lock);
if (nla_put_u8(skb, SMC_NLA_SEID_ENABLED, seid_enabled))
goto err;
end:
genlmsg_end(skb, hdr);
cb_ctx->pos[0]++;
return skb->len;
err:
genlmsg_cancel(skb, hdr);
return -EMSGSIZE;
}
int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info)
{
#if IS_ENABLED(CONFIG_S390)
write_lock(&smc_clc_eid_table.lock);
smc_clc_eid_table.seid_enabled = 1;
write_unlock(&smc_clc_eid_table.lock);
return 0;
#else
return -EOPNOTSUPP;
#endif
}
int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info)
{
int rc = 0;
#if IS_ENABLED(CONFIG_S390)
write_lock(&smc_clc_eid_table.lock);
if (!smc_clc_eid_table.ueid_cnt)
rc = -ENOENT;
else
smc_clc_eid_table.seid_enabled = 0;
write_unlock(&smc_clc_eid_table.lock);
#else
rc = -EOPNOTSUPP;
#endif
return rc;
}
static bool _smc_clc_match_ueid(u8 *peer_ueid)
{
struct smc_clc_eid_entry *tmp_ueid;
list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) {
if (!memcmp(tmp_ueid->eid, peer_ueid, SMC_MAX_EID_LEN))
return true;
}
return false;
}
bool smc_clc_match_eid(u8 *negotiated_eid,
struct smc_clc_v2_extension *smc_v2_ext,
u8 *peer_eid, u8 *local_eid)
{
bool match = false;
int i;
negotiated_eid[0] = 0;
read_lock(&smc_clc_eid_table.lock);
if (peer_eid && local_eid &&
smc_clc_eid_table.seid_enabled &&
smc_v2_ext->hdr.flag.seid &&
!memcmp(peer_eid, local_eid, SMC_MAX_EID_LEN)) {
memcpy(negotiated_eid, peer_eid, SMC_MAX_EID_LEN);
match = true;
goto out;
}
for (i = 0; i < smc_v2_ext->hdr.eid_cnt; i++) {
if (_smc_clc_match_ueid(smc_v2_ext->user_eids[i])) {
memcpy(negotiated_eid, smc_v2_ext->user_eids[i],
SMC_MAX_EID_LEN);
match = true;
goto out;
}
}
out:
read_unlock(&smc_clc_eid_table.lock);
return match;
}
/* check arriving CLC proposal */
static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc)
{
struct smc_clc_msg_proposal_prefix *pclc_prfx;
struct smc_clc_smcd_v2_extension *smcd_v2_ext;
struct smc_clc_msg_hdr *hdr = &pclc->hdr;
struct smc_clc_v2_extension *v2_ext;
v2_ext = smc_get_clc_v2_ext(pclc);
pclc_prfx = smc_clc_proposal_get_prefix(pclc);
if (hdr->version == SMC_V1) {
if (hdr->typev1 == SMC_TYPE_N)
return false;
if (ntohs(hdr->length) !=
sizeof(*pclc) + ntohs(pclc->iparea_offset) +
sizeof(*pclc_prfx) +
pclc_prfx->ipv6_prefixes_cnt *
sizeof(struct smc_clc_ipv6_prefix) +
sizeof(struct smc_clc_msg_trail))
return false;
} else {
if (ntohs(hdr->length) !=
sizeof(*pclc) +
sizeof(struct smc_clc_msg_smcd) +
(hdr->typev1 != SMC_TYPE_N ?
sizeof(*pclc_prfx) +
pclc_prfx->ipv6_prefixes_cnt *
sizeof(struct smc_clc_ipv6_prefix) : 0) +
(hdr->typev2 != SMC_TYPE_N ?
sizeof(*v2_ext) +
v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN : 0) +
(smcd_indicated(hdr->typev2) ?
sizeof(*smcd_v2_ext) + v2_ext->hdr.ism_gid_cnt *
sizeof(struct smc_clc_smcd_gid_chid) :
0) +
sizeof(struct smc_clc_msg_trail))
return false;
}
return true;
}
/* check arriving CLC accept or confirm */
static bool
smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm *clc)
{
struct smc_clc_msg_hdr *hdr = &clc->hdr;
if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
return false;
if (hdr->version == SMC_V1) {
if ((hdr->typev1 == SMC_TYPE_R &&
ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) ||
(hdr->typev1 == SMC_TYPE_D &&
ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN))
return false;
} else {
if (hdr->typev1 == SMC_TYPE_D &&
ntohs(hdr->length) < SMCD_CLC_ACCEPT_CONFIRM_LEN_V2)
return false;
if (hdr->typev1 == SMC_TYPE_R &&
ntohs(hdr->length) < SMCR_CLC_ACCEPT_CONFIRM_LEN_V2)
return false;
}
return true;
}
/* check arriving CLC decline */
static bool
smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc)
{
struct smc_clc_msg_hdr *hdr = &dclc->hdr;
if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D)
return false;
if (hdr->version == SMC_V1) {
if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline))
return false;
} else {
if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline_v2))
return false;
}
return true;
}
static int smc_clc_fill_fce_v2x(struct smc_clc_first_contact_ext_v2x *fce_v2x,
struct smc_init_info *ini)
{
int ret = sizeof(*fce_v2x);
memset(fce_v2x, 0, sizeof(*fce_v2x));
fce_v2x->fce_v2_base.os_type = SMC_CLC_OS_LINUX;
fce_v2x->fce_v2_base.release = ini->release_nr;
memcpy(fce_v2x->fce_v2_base.hostname,
smc_hostname, sizeof(smc_hostname));
if (ini->is_smcd && ini->release_nr < SMC_RELEASE_1) {
ret = sizeof(struct smc_clc_first_contact_ext);
goto out;
}
if (ini->release_nr >= SMC_RELEASE_1) {
if (!ini->is_smcd) {
fce_v2x->max_conns = ini->max_conns;
fce_v2x->max_links = ini->max_links;
}
fce_v2x->feature_mask = htons(ini->feature_mask);
}
out:
return ret;
}
/* check if received message has a correct header length and contains valid
* heading and trailing eyecatchers
*/
static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl)
{
struct smc_clc_msg_accept_confirm *clc;
struct smc_clc_msg_proposal *pclc;
struct smc_clc_msg_decline *dclc;
struct smc_clc_msg_trail *trl;
if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
return false;
switch (clcm->type) {
case SMC_CLC_PROPOSAL:
pclc = (struct smc_clc_msg_proposal *)clcm;
if (!smc_clc_msg_prop_valid(pclc))
return false;
trl = (struct smc_clc_msg_trail *)
((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl));
break;
case SMC_CLC_ACCEPT:
case SMC_CLC_CONFIRM:
clc = (struct smc_clc_msg_accept_confirm *)clcm;
if (!smc_clc_msg_acc_conf_valid(clc))
return false;
trl = (struct smc_clc_msg_trail *)
((u8 *)clc + ntohs(clc->hdr.length) - sizeof(*trl));
break;
case SMC_CLC_DECLINE:
dclc = (struct smc_clc_msg_decline *)clcm;
if (!smc_clc_msg_decl_valid(dclc))
return false;
check_trl = false;
break;
default:
return false;
}
if (check_trl &&
memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) &&
memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER)))
return false;
return true;
}
/* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */
static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4,
struct smc_clc_msg_proposal_prefix *prop)
{
struct in_device *in_dev = __in_dev_get_rcu(dst->dev);
const struct in_ifaddr *ifa;
if (!in_dev)
return -ENODEV;
in_dev_for_each_ifa_rcu(ifa, in_dev) {
if (!inet_ifa_match(ipv4, ifa))
continue;
prop->prefix_len = inet_mask_len(ifa->ifa_mask);
prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask;
/* prop->ipv6_prefixes_cnt = 0; already done by memset before */
return 0;
}
return -ENOENT;
}
/* fill CLC proposal msg with ipv6 prefixes from device */
static int smc_clc_prfx_set6_rcu(struct dst_entry *dst,
struct smc_clc_msg_proposal_prefix *prop,
struct smc_clc_ipv6_prefix *ipv6_prfx)
{
#if IS_ENABLED(CONFIG_IPV6)
struct inet6_dev *in6_dev = __in6_dev_get(dst->dev);
struct inet6_ifaddr *ifa;
int cnt = 0;
if (!in6_dev)
return -ENODEV;
/* use a maximum of 8 IPv6 prefixes from device */
list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
continue;
ipv6_addr_prefix(&ipv6_prfx[cnt].prefix,
&ifa->addr, ifa->prefix_len);
ipv6_prfx[cnt].prefix_len = ifa->prefix_len;
cnt++;
if (cnt == SMC_CLC_MAX_V6_PREFIX)
break;
}
prop->ipv6_prefixes_cnt = cnt;
if (cnt)
return 0;
#endif
return -ENOENT;
}
/* retrieve and set prefixes in CLC proposal msg */
static int smc_clc_prfx_set(struct socket *clcsock,
struct smc_clc_msg_proposal_prefix *prop,
struct smc_clc_ipv6_prefix *ipv6_prfx)
{
struct dst_entry *dst = sk_dst_get(clcsock->sk);
struct sockaddr_storage addrs;
struct sockaddr_in6 *addr6;
struct sockaddr_in *addr;
int rc = -ENOENT;
if (!dst) {
rc = -ENOTCONN;
goto out;
}
if (!dst->dev) {
rc = -ENODEV;
goto out_rel;
}
/* get address to which the internal TCP socket is bound */
if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0)
goto out_rel;
/* analyze IP specific data of net_device belonging to TCP socket */
addr6 = (struct sockaddr_in6 *)&addrs;
rcu_read_lock();
if (addrs.ss_family == PF_INET) {
/* IPv4 */
addr = (struct sockaddr_in *)&addrs;
rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop);
} else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) {
/* mapped IPv4 address - peer is IPv4 only */
rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3],
prop);
} else {
/* IPv6 */
rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx);
}
rcu_read_unlock();
out_rel:
dst_release(dst);
out:
return rc;
}
/* match ipv4 addrs of dev against addr in CLC proposal */
static int smc_clc_prfx_match4_rcu(struct net_device *dev,
struct smc_clc_msg_proposal_prefix *prop)
{
struct in_device *in_dev = __in_dev_get_rcu(dev);
const struct in_ifaddr *ifa;
if (!in_dev)
return -ENODEV;
in_dev_for_each_ifa_rcu(ifa, in_dev) {
if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) &&
inet_ifa_match(prop->outgoing_subnet, ifa))
return 0;
}
return -ENOENT;
}
/* match ipv6 addrs of dev against addrs in CLC proposal */
static int smc_clc_prfx_match6_rcu(struct net_device *dev,
struct smc_clc_msg_proposal_prefix *prop)
{
#if IS_ENABLED(CONFIG_IPV6)
struct inet6_dev *in6_dev = __in6_dev_get(dev);
struct smc_clc_ipv6_prefix *ipv6_prfx;
struct inet6_ifaddr *ifa;
int i, max;
if (!in6_dev)
return -ENODEV;
/* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */
ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop));
max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX);
list_for_each_entry(ifa, &in6_dev->addr_list, if_list) {
if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)
continue;
for (i = 0; i < max; i++) {
if (ifa->prefix_len == ipv6_prfx[i].prefix_len &&
ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix,
ifa->prefix_len))
return 0;
}
}
#endif
return -ENOENT;
}
/* check if proposed prefixes match one of our device prefixes */
int smc_clc_prfx_match(struct socket *clcsock,
struct smc_clc_msg_proposal_prefix *prop)
{
struct dst_entry *dst = sk_dst_get(clcsock->sk);
int rc;
if (!dst) {
rc = -ENOTCONN;
goto out;
}
if (!dst->dev) {
rc = -ENODEV;
goto out_rel;
}
rcu_read_lock();
if (!prop->ipv6_prefixes_cnt)
rc = smc_clc_prfx_match4_rcu(dst->dev, prop);
else
rc = smc_clc_prfx_match6_rcu(dst->dev, prop);
rcu_read_unlock();
out_rel:
dst_release(dst);
out:
return rc;
}
/* Wait for data on the tcp-socket, analyze received data
* Returns:
* 0 if success and it was not a decline that we received.
* SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send.
* clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise.
*/
int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
u8 expected_type, unsigned long timeout)
{
long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo;
struct sock *clc_sk = smc->clcsock->sk;
struct smc_clc_msg_hdr *clcm = buf;
struct msghdr msg = {NULL, 0};
int reason_code = 0;
struct kvec vec = {buf, buflen};
int len, datlen, recvlen;
bool check_trl = true;
int krflags;
/* peek the first few bytes to determine length of data to receive
* so we don't consume any subsequent CLC message or payload data
* in the TCP byte stream
*/
/*
* Caller must make sure that buflen is no less than
* sizeof(struct smc_clc_msg_hdr)
*/
krflags = MSG_PEEK | MSG_WAITALL;
clc_sk->sk_rcvtimeo = timeout;
iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1,
sizeof(struct smc_clc_msg_hdr));
len = sock_recvmsg(smc->clcsock, &msg, krflags);
if (signal_pending(current)) {
reason_code = -EINTR;
clc_sk->sk_err = EINTR;
smc->sk.sk_err = EINTR;
goto out;
}
if (clc_sk->sk_err) {
reason_code = -clc_sk->sk_err;
if (clc_sk->sk_err == EAGAIN &&
expected_type == SMC_CLC_DECLINE)
clc_sk->sk_err = 0; /* reset for fallback usage */
else
smc->sk.sk_err = clc_sk->sk_err;
goto out;
}
if (!len) { /* peer has performed orderly shutdown */
smc->sk.sk_err = ECONNRESET;
reason_code = -ECONNRESET;
goto out;
}
if (len < 0) {
if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE)
smc->sk.sk_err = -len;
reason_code = len;
goto out;
}
datlen = ntohs(clcm->length);
if ((len < sizeof(struct smc_clc_msg_hdr)) ||
(clcm->version < SMC_V1) ||
((clcm->type != SMC_CLC_DECLINE) &&
(clcm->type != expected_type))) {
smc->sk.sk_err = EPROTO;
reason_code = -EPROTO;
goto out;
}
/* receive the complete CLC message */
memset(&msg, 0, sizeof(struct msghdr));
if (datlen > buflen) {
check_trl = false;
recvlen = buflen;
} else {
recvlen = datlen;
}
iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
krflags = MSG_WAITALL;
len = sock_recvmsg(smc->clcsock, &msg, krflags);
if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) {
smc->sk.sk_err = EPROTO;
reason_code = -EPROTO;
goto out;
}
datlen -= len;
while (datlen) {
u8 tmp[SMC_CLC_RECV_BUF_LEN];
vec.iov_base = &tmp;
vec.iov_len = SMC_CLC_RECV_BUF_LEN;
/* receive remaining proposal message */
recvlen = datlen > SMC_CLC_RECV_BUF_LEN ?
SMC_CLC_RECV_BUF_LEN : datlen;
iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
len = sock_recvmsg(smc->clcsock, &msg, krflags);
datlen -= len;
}
if (clcm->type == SMC_CLC_DECLINE) {
struct smc_clc_msg_decline *dclc;
dclc = (struct smc_clc_msg_decline *)clcm;
reason_code = SMC_CLC_DECL_PEERDECL;
smc->peer_diagnosis = ntohl(dclc->peer_diagnosis);
if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 &
SMC_FIRST_CONTACT_MASK) {
smc->conn.lgr->sync_err = 1;
smc_lgr_terminate_sched(smc->conn.lgr);
}
}
out:
clc_sk->sk_rcvtimeo = rcvtimeo;
return reason_code;
}
/* send CLC DECLINE message across internal TCP socket */
int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version)
{
struct smc_clc_msg_decline *dclc_v1;
struct smc_clc_msg_decline_v2 dclc;
struct msghdr msg;
int len, send_len;
struct kvec vec;
dclc_v1 = (struct smc_clc_msg_decline *)&dclc;
memset(&dclc, 0, sizeof(dclc));
memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
dclc.hdr.type = SMC_CLC_DECLINE;
dclc.hdr.version = version;
dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX;
dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ?
SMC_FIRST_CONTACT_MASK : 0;
if ((!smc_conn_lgr_valid(&smc->conn) || !smc->conn.lgr->is_smcd) &&
smc_ib_is_valid_local_systemid())
memcpy(dclc.id_for_peer, local_systemid,
sizeof(local_systemid));
dclc.peer_diagnosis = htonl(peer_diag_info);
if (version == SMC_V1) {
memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER,
sizeof(SMC_EYECATCHER));
send_len = sizeof(*dclc_v1);
} else {
memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER,
sizeof(SMC_EYECATCHER));
send_len = sizeof(dclc);
}
dclc.hdr.length = htons(send_len);
memset(&msg, 0, sizeof(msg));
vec.iov_base = &dclc;
vec.iov_len = send_len;
len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len);
if (len < 0 || len < send_len)
len = -EPROTO;
return len > 0 ? 0 : len;
}
/* send CLC PROPOSAL message across internal TCP socket */
int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
{
struct smc_clc_smcd_v2_extension *smcd_v2_ext;
struct smc_clc_msg_proposal_prefix *pclc_prfx;
struct smc_clc_msg_proposal *pclc_base;
struct smc_clc_smcd_gid_chid *gidchids;
struct smc_clc_msg_proposal_area *pclc;
struct smc_clc_ipv6_prefix *ipv6_prfx;
struct net *net = sock_net(&smc->sk);
struct smc_clc_v2_extension *v2_ext;
struct smc_clc_msg_smcd *pclc_smcd;
struct smc_clc_msg_trail *trl;
struct smcd_dev *smcd;
int len, i, plen, rc;
int reason_code = 0;
struct kvec vec[8];
struct msghdr msg;
pclc = kzalloc(sizeof(*pclc), GFP_KERNEL);
if (!pclc)
return -ENOMEM;
pclc_base = &pclc->pclc_base;
pclc_smcd = &pclc->pclc_smcd;
pclc_prfx = &pclc->pclc_prfx;
ipv6_prfx = pclc->pclc_prfx_ipv6;
v2_ext = &pclc->pclc_v2_ext;
smcd_v2_ext = &pclc->pclc_smcd_v2_ext;
gidchids = pclc->pclc_gidchids;
trl = &pclc->pclc_trl;
pclc_base->hdr.version = SMC_V2;
pclc_base->hdr.typev1 = ini->smc_type_v1;
pclc_base->hdr.typev2 = ini->smc_type_v2;
plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl);
/* retrieve ip prefixes for CLC proposal msg */
if (ini->smc_type_v1 != SMC_TYPE_N) {
rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx);
if (rc) {
if (ini->smc_type_v2 == SMC_TYPE_N) {
kfree(pclc);
return SMC_CLC_DECL_CNFERR;
}
pclc_base->hdr.typev1 = SMC_TYPE_N;
} else {
pclc_base->iparea_offset = htons(sizeof(*pclc_smcd));
plen += sizeof(*pclc_prfx) +
pclc_prfx->ipv6_prefixes_cnt *
sizeof(ipv6_prfx[0]);
}
}
/* build SMC Proposal CLC message */
memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER,
sizeof(SMC_EYECATCHER));
pclc_base->hdr.type = SMC_CLC_PROPOSAL;
if (smcr_indicated(ini->smc_type_v1)) {
/* add SMC-R specifics */
memcpy(pclc_base->lcl.id_for_peer, local_systemid,
sizeof(local_systemid));
memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE);
memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1],
ETH_ALEN);
}
if (smcd_indicated(ini->smc_type_v1)) {
struct smcd_gid smcd_gid;
/* add SMC-D specifics */
if (ini->ism_dev[0]) {
smcd = ini->ism_dev[0];
smcd->ops->get_local_gid(smcd, &smcd_gid);
pclc_smcd->ism.gid = htonll(smcd_gid.gid);
pclc_smcd->ism.chid =
htons(smc_ism_get_chid(ini->ism_dev[0]));
}
}
if (ini->smc_type_v2 == SMC_TYPE_N) {
pclc_smcd->v2_ext_offset = 0;
} else {
struct smc_clc_eid_entry *ueident;
u16 v2_ext_offset;
v2_ext->hdr.flag.release = SMC_RELEASE;
v2_ext_offset = sizeof(*pclc_smcd) -
offsetofend(struct smc_clc_msg_smcd, v2_ext_offset);
if (ini->smc_type_v1 != SMC_TYPE_N)
v2_ext_offset += sizeof(*pclc_prfx) +
pclc_prfx->ipv6_prefixes_cnt *
sizeof(ipv6_prfx[0]);
pclc_smcd->v2_ext_offset = htons(v2_ext_offset);
plen += sizeof(*v2_ext);
v2_ext->feature_mask = htons(SMC_FEATURE_MASK);
read_lock(&smc_clc_eid_table.lock);
v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt;
plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN;
i = 0;
list_for_each_entry(ueident, &smc_clc_eid_table.list, list) {
memcpy(v2_ext->user_eids[i++], ueident->eid,
sizeof(ueident->eid));
}
read_unlock(&smc_clc_eid_table.lock);
}
if (smcd_indicated(ini->smc_type_v2)) {
struct smcd_gid smcd_gid;
u8 *eid = NULL;
int entry = 0;
v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled;
v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) -
offsetofend(struct smc_clnt_opts_area_hdr,
smcd_v2_ext_offset) +
v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
smc_ism_get_system_eid(&eid);
if (eid && v2_ext->hdr.flag.seid)
memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN);
plen += sizeof(*smcd_v2_ext);
if (ini->ism_offered_cnt) {
for (i = 1; i <= ini->ism_offered_cnt; i++) {
smcd = ini->ism_dev[i];
smcd->ops->get_local_gid(smcd, &smcd_gid);
gidchids[entry].chid =
htons(smc_ism_get_chid(ini->ism_dev[i]));
gidchids[entry].gid = htonll(smcd_gid.gid);
if (smc_ism_is_emulated(smcd)) {
/* an Emulated-ISM device takes two
* entries. CHID of the second entry
* repeats that of the first entry.
*/
gidchids[entry + 1].chid =
gidchids[entry].chid;
gidchids[entry + 1].gid =
htonll(smcd_gid.gid_ext);
entry++;
}
entry++;
}
plen += entry * sizeof(struct smc_clc_smcd_gid_chid);
}
v2_ext->hdr.ism_gid_cnt = entry;
}
if (smcr_indicated(ini->smc_type_v2)) {
memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE);
v2_ext->max_conns = net->smc.sysctl_max_conns_per_lgr;
v2_ext->max_links = net->smc.sysctl_max_links_per_lgr;
}
pclc_base->hdr.length = htons(plen);
memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
/* send SMC Proposal CLC message */
memset(&msg, 0, sizeof(msg));
i = 0;
vec[i].iov_base = pclc_base;
vec[i++].iov_len = sizeof(*pclc_base);
vec[i].iov_base = pclc_smcd;
vec[i++].iov_len = sizeof(*pclc_smcd);
if (ini->smc_type_v1 != SMC_TYPE_N) {
vec[i].iov_base = pclc_prfx;
vec[i++].iov_len = sizeof(*pclc_prfx);
if (pclc_prfx->ipv6_prefixes_cnt > 0) {
vec[i].iov_base = ipv6_prfx;
vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt *
sizeof(ipv6_prfx[0]);
}
}
if (ini->smc_type_v2 != SMC_TYPE_N) {
vec[i].iov_base = v2_ext;
vec[i++].iov_len = sizeof(*v2_ext) +
(v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);