summaryrefslogtreecommitdiff
path: root/net/tipc/msg.h
blob: 14697e6c995e78821771a428dbf8362e8f5f36a7 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
/*
 * net/tipc/msg.h: Include file for TIPC message header routines
 *
 * Copyright (c) 2000-2007, 2014-2017 Ericsson AB
 * Copyright (c) 2005-2008, 2010-2011, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _TIPC_MSG_H
#define _TIPC_MSG_H

#include <linux/tipc.h>
#include "core.h"

/*
 * Constants and routines used to read and write TIPC payload message headers
 *
 * Note: Some items are also used with TIPC internal message headers
 */
#define TIPC_VERSION              2
struct plist;

/*
 * Payload message users are defined in TIPC's public API:
 * - TIPC_LOW_IMPORTANCE
 * - TIPC_MEDIUM_IMPORTANCE
 * - TIPC_HIGH_IMPORTANCE
 * - TIPC_CRITICAL_IMPORTANCE
 */
#define TIPC_SYSTEM_IMPORTANCE	4


/*
 * Payload message types
 */
#define TIPC_CONN_MSG           0
#define TIPC_MCAST_MSG          1
#define TIPC_NAMED_MSG          2
#define TIPC_DIRECT_MSG         3
#define TIPC_GRP_MEMBER_EVT     4
#define TIPC_GRP_BCAST_MSG      5
#define TIPC_GRP_MCAST_MSG      6
#define TIPC_GRP_UCAST_MSG      7

/*
 * Internal message users
 */
#define  BCAST_PROTOCOL       5
#define  MSG_BUNDLER          6
#define  LINK_PROTOCOL        7
#define  CONN_MANAGER         8
#define  GROUP_PROTOCOL       9
#define  TUNNEL_PROTOCOL      10
#define  NAME_DISTRIBUTOR     11
#define  MSG_FRAGMENTER       12
#define  LINK_CONFIG          13
#define  SOCK_WAKEUP          14       /* pseudo user */
#define  TOP_SRV              15       /* pseudo user */

/*
 * Message header sizes
 */
#define SHORT_H_SIZE              24	/* In-cluster basic payload message */
#define BASIC_H_SIZE              32	/* Basic payload message */
#define NAMED_H_SIZE              40	/* Named payload message */
#define MCAST_H_SIZE              44	/* Multicast payload message */
#define GROUP_H_SIZE              44	/* Group payload message */
#define INT_H_SIZE                40	/* Internal messages */
#define MIN_H_SIZE                24	/* Smallest legal TIPC header size */
#define MAX_H_SIZE                60	/* Largest possible TIPC header size */

#define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
#define FB_MTU                  3744
#define TIPC_MEDIA_INFO_OFFSET	5

struct tipc_skb_cb {
	struct sk_buff *tail;
	unsigned long nxt_retr;
	unsigned long retr_stamp;
	u32 bytes_read;
	u32 orig_member;
	u16 chain_imp;
	u16 ackers;
	u16 retr_cnt;
	bool validated;
};

#define TIPC_SKB_CB(__skb) ((struct tipc_skb_cb *)&((__skb)->cb[0]))

struct tipc_msg {
	__be32 hdr[15];
};

/* struct tipc_gap_ack - TIPC Gap ACK block
 * @ack: seqno of the last consecutive packet in link deferdq
 * @gap: number of gap packets since the last ack
 *
 * E.g:
 *       link deferdq: 1 2 3 4      10 11      13 14 15       20
 * --> Gap ACK blocks:      <4, 5>,   <11, 1>,      <15, 4>, <20, 0>
 */
struct tipc_gap_ack {
	__be16 ack;
	__be16 gap;
};

/* struct tipc_gap_ack_blks
 * @len: actual length of the record
 * @gack_cnt: number of Gap ACK blocks in the record
 * @gacks: array of Gap ACK blocks
 */
struct tipc_gap_ack_blks {
	__be16 len;
	u8 gack_cnt;
	u8 reserved;
	struct tipc_gap_ack gacks[];
};

#define tipc_gap_ack_blks_sz(n) (sizeof(struct tipc_gap_ack_blks) + \
				 sizeof(struct tipc_gap_ack) * (n))

#define MAX_GAP_ACK_BLKS	32
#define MAX_GAP_ACK_BLKS_SZ	tipc_gap_ack_blks_sz(MAX_GAP_ACK_BLKS)

static inline struct tipc_msg *buf_msg(struct sk_buff *skb)
{
	return (struct tipc_msg *)skb->data;
}

static inline u32 msg_word(struct tipc_msg *m, u32 pos)
{
	return ntohl(m->hdr[pos]);
}

static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
{
	m->hdr[w] = htonl(val);
}

static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
{
	return (msg_word(m, w) >> pos) & mask;
}

static inline void msg_set_bits(struct tipc_msg *m, u32 w,
				u32 pos, u32 mask, u32 val)
{
	val = (val & mask) << pos;
	mask = mask << pos;
	m->hdr[w] &= ~htonl(mask);
	m->hdr[w] |= htonl(val);
}

static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
{
	u32 temp = msg->hdr[a];

	msg->hdr[a] = msg->hdr[b];
	msg->hdr[b] = temp;
}

/*
 * Word 0
 */
static inline u32 msg_version(struct tipc_msg *m)
{
	return msg_bits(m, 0, 29, 7);
}

static inline void msg_set_version(struct tipc_msg *m)
{
	msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
}

static inline u32 msg_user(struct tipc_msg *m)
{
	return msg_bits(m, 0, 25, 0xf);
}

static inline u32 msg_isdata(struct tipc_msg *m)
{
	return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
}

static inline void msg_set_user(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 0, 25, 0xf, n);
}

static inline u32 msg_hdr_sz(struct tipc_msg *m)
{
	return msg_bits(m, 0, 21, 0xf) << 2;
}

static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 0, 21, 0xf, n>>2);
}

static inline u32 msg_size(struct tipc_msg *m)
{
	return msg_bits(m, 0, 0, 0x1ffff);
}

static inline u32 msg_blocks(struct tipc_msg *m)
{
	return (msg_size(m) / 1024) + 1;
}

static inline u32 msg_data_sz(struct tipc_msg *m)
{
	return msg_size(m) - msg_hdr_sz(m);
}

static inline int msg_non_seq(struct tipc_msg *m)
{
	return msg_bits(m, 0, 20, 1);
}

static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 0, 20, 1, n);
}

static inline int msg_is_syn(struct tipc_msg *m)
{
	return msg_bits(m, 0, 17, 1);
}

static inline void msg_set_syn(struct tipc_msg *m, u32 d)
{
	msg_set_bits(m, 0, 17, 1, d);
}

static inline int msg_dest_droppable(struct tipc_msg *m)
{
	return msg_bits(m, 0, 19, 1);
}

static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
{
	msg_set_bits(m, 0, 19, 1, d);
}

static inline int msg_is_keepalive(struct tipc_msg *m)
{
	return msg_bits(m, 0, 19, 1);
}

static inline void msg_set_is_keepalive(struct tipc_msg *m, u32 d)
{
	msg_set_bits(m, 0, 19, 1, d);
}

static inline int msg_src_droppable(struct tipc_msg *m)
{
	return msg_bits(m, 0, 18, 1);
}

static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
{
	msg_set_bits(m, 0, 18, 1, d);
}

static inline int msg_ack_required(struct tipc_msg *m)
{
	return msg_bits(m, 0, 18, 1);
}

static inline void msg_set_ack_required(struct tipc_msg *m, u32 d)
{
	msg_set_bits(m, 0, 18, 1, d);
}

static inline bool msg_is_rcast(struct tipc_msg *m)
{
	return msg_bits(m, 0, 18, 0x1);
}

static inline void msg_set_is_rcast(struct tipc_msg *m, bool d)
{
	msg_set_bits(m, 0, 18, 0x1, d);
}

static inline void msg_set_size(struct tipc_msg *m, u32 sz)
{
	m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
}

static inline unchar *msg_data(struct tipc_msg *m)
{
	return ((unchar *)m) + msg_hdr_sz(m);
}

static inline struct tipc_msg *msg_inner_hdr(struct tipc_msg *m)
{
	return (struct tipc_msg *)msg_data(m);
}

/*
 * Word 1
 */
static inline u32 msg_type(struct tipc_msg *m)
{
	return msg_bits(m, 1, 29, 0x7);
}

static inline void msg_set_type(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 1, 29, 0x7, n);
}

static inline int msg_in_group(struct tipc_msg *m)
{
	int mtyp = msg_type(m);

	return mtyp >= TIPC_GRP_MEMBER_EVT && mtyp <= TIPC_GRP_UCAST_MSG;
}

static inline bool msg_is_grp_evt(struct tipc_msg *m)
{
	return msg_type(m) == TIPC_GRP_MEMBER_EVT;
}

static inline u32 msg_named(struct tipc_msg *m)
{
	return msg_type(m) == TIPC_NAMED_MSG;
}

static inline u32 msg_mcast(struct tipc_msg *m)
{
	int mtyp = msg_type(m);

	return ((mtyp == TIPC_MCAST_MSG) || (mtyp == TIPC_GRP_BCAST_MSG) ||
		(mtyp == TIPC_GRP_MCAST_MSG));
}

static inline u32 msg_connected(struct tipc_msg *m)
{
	return msg_type(m) == TIPC_CONN_MSG;
}

static inline u32 msg_errcode(struct tipc_msg *m)
{
	return msg_bits(m, 1, 25, 0xf);
}

static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
{
	msg_set_bits(m, 1, 25, 0xf, err);
}

static inline u32 msg_reroute_cnt(struct tipc_msg *m)
{
	return msg_bits(m, 1, 21, 0xf);
}

static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
{
	msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
}

static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
{
	msg_set_bits(m, 1, 21, 0xf, 0);
}

static inline u32 msg_lookup_scope(struct tipc_msg *m)
{
	return msg_bits(m, 1, 19, 0x3);
}

static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 1, 19, 0x3, n);
}

static inline u16 msg_bcast_ack(struct tipc_msg *m)
{
	return msg_bits(m, 1, 0, 0xffff);
}

static inline void msg_set_bcast_ack(struct tipc_msg *m, u16 n)
{
	msg_set_bits(m, 1, 0, 0xffff, n);
}

/* Note: reusing bits in word 1 for ACTIVATE_MSG only, to re-synch
 * link peer session number
 */
static inline bool msg_dest_session_valid(struct tipc_msg *m)
{
	return msg_bits(m, 1, 16, 0x1);
}

static inline void msg_set_dest_session_valid(struct tipc_msg *m, bool valid)
{
	msg_set_bits(m, 1, 16, 0x1, valid);
}

static inline u16 msg_dest_session(struct tipc_msg *m)
{
	return msg_bits(m, 1, 0, 0xffff);
}

static inline void msg_set_dest_session(struct tipc_msg *m, u16 n)
{
	msg_set_bits(m, 1, 0, 0xffff, n);
}

/*
 * Word 2
 */
static inline u16 msg_ack(struct tipc_msg *m)
{
	return msg_bits(m, 2, 16, 0xffff);
}

static inline void msg_set_ack(struct tipc_msg *m, u16 n)
{
	msg_set_bits(m, 2, 16, 0xffff, n);
}

static inline u16 msg_seqno(struct tipc_msg *m)
{
	return msg_bits(m, 2, 0, 0xffff);
}

static inline void msg_set_seqno(struct tipc_msg *m, u16 n)
{
	msg_set_bits(m, 2, 0, 0xffff, n);
}

/*
 * Words 3-10
 */
static inline u32 msg_importance(struct tipc_msg *m)
{
	int usr = msg_user(m);

	if (likely((usr <= TIPC_CRITICAL_IMPORTANCE) && !msg_errcode(m)))
		return usr;
	if ((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER))
		return msg_bits(m, 9, 0, 0x7);
	return TIPC_SYSTEM_IMPORTANCE;
}

static inline void msg_set_importance(struct tipc_msg *m, u32 i)
{
	int usr = msg_user(m);

	if (likely((usr == MSG_FRAGMENTER) || (usr == MSG_BUNDLER)))
		msg_set_bits(m, 9, 0, 0x7, i);
	else if (i < TIPC_SYSTEM_IMPORTANCE)
		msg_set_user(m, i);
	else
		pr_warn("Trying to set illegal importance in message\n");
}

static inline u32 msg_prevnode(struct tipc_msg *m)
{
	return msg_word(m, 3);
}

static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
{
	msg_set_word(m, 3, a);
}

static inline u32 msg_origport(struct tipc_msg *m)
{
	if (msg_user(m) == MSG_FRAGMENTER)
		m = msg_inner_hdr(m);
	return msg_word(m, 4);
}

static inline void msg_set_origport(struct tipc_msg *m, u32 p)
{
	msg_set_word(m, 4, p);
}

static inline u32 msg_destport(struct tipc_msg *m)
{
	return msg_word(m, 5);
}

static inline void msg_set_destport(struct tipc_msg *m, u32 p)
{
	msg_set_word(m, 5, p);
}

static inline u32 msg_mc_netid(struct tipc_msg *m)
{
	return msg_word(m, 5);
}

static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
{
	msg_set_word(m, 5, p);
}

static inline int msg_short(struct tipc_msg *m)
{
	return msg_hdr_sz(m) == SHORT_H_SIZE;
}

static inline u32 msg_orignode(struct tipc_msg *m)
{
	if (likely(msg_short(m)))
		return msg_prevnode(m);
	return msg_word(m, 6);
}

static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
{
	msg_set_word(m, 6, a);
}

static inline u32 msg_destnode(struct tipc_msg *m)
{
	return msg_word(m, 7);
}

static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
{
	msg_set_word(m, 7, a);
}

static inline u32 msg_nametype(struct tipc_msg *m)
{
	return msg_word(m, 8);
}

static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
{
	msg_set_word(m, 8, n);
}

static inline u32 msg_nameinst(struct tipc_msg *m)
{
	return msg_word(m, 9);
}

static inline u32 msg_namelower(struct tipc_msg *m)
{
	return msg_nameinst(m);
}

static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
{
	msg_set_word(m, 9, n);
}

static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
{
	msg_set_namelower(m, n);
}

static inline u32 msg_nameupper(struct tipc_msg *m)
{
	return msg_word(m, 10);
}

static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
{
	msg_set_word(m, 10, n);
}

/*
 * Constants and routines used to read and write TIPC internal message headers
 */

/*
 *  Connection management protocol message types
 */
#define CONN_PROBE        0
#define CONN_PROBE_REPLY  1
#define CONN_ACK          2

/*
 * Name distributor message types
 */
#define PUBLICATION       0
#define WITHDRAWAL        1

/*
 * Segmentation message types
 */
#define FIRST_FRAGMENT		0
#define FRAGMENT		1
#define LAST_FRAGMENT		2

/*
 * Link management protocol message types
 */
#define STATE_MSG		0
#define RESET_MSG		1
#define ACTIVATE_MSG		2

/*
 * Changeover tunnel message types
 */
#define SYNCH_MSG		0
#define FAILOVER_MSG		1

/*
 * Config protocol message types
 */
#define DSC_REQ_MSG		0
#define DSC_RESP_MSG		1
#define DSC_TRIAL_MSG		2
#define DSC_TRIAL_FAIL_MSG	3

/*
 * Group protocol message types
 */
#define GRP_JOIN_MSG         0
#define GRP_LEAVE_MSG        1
#define GRP_ADV_MSG          2
#define GRP_ACK_MSG          3
#define GRP_RECLAIM_MSG      4
#define GRP_REMIT_MSG        5

/*
 * Word 1
 */
static inline u32 msg_seq_gap(struct tipc_msg *m)
{
	return msg_bits(m, 1, 16, 0x1fff);
}

static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 1, 16, 0x1fff, n);
}

static inline u32 msg_node_sig(struct tipc_msg *m)
{
	return msg_bits(m, 1, 0, 0xffff);
}

static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 1, 0, 0xffff, n);
}

static inline u32 msg_node_capabilities(struct tipc_msg *m)
{
	return msg_bits(m, 1, 15, 0x1fff);
}

static inline void msg_set_node_capabilities(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 1, 15, 0x1fff, n);
}

/*
 * Word 2
 */
static inline u32 msg_dest_domain(struct tipc_msg *m)
{
	return msg_word(m, 2);
}

static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
{
	msg_set_word(m, 2, n);
}

static inline u32 msg_bcgap_after(struct tipc_msg *m)
{
	return msg_bits(m, 2, 16, 0xffff);
}

static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 2, 16, 0xffff, n);
}

static inline u32 msg_bcgap_to(struct tipc_msg *m)
{
	return msg_bits(m, 2, 0, 0xffff);
}

static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 2, 0, 0xffff, n);
}

/*
 * Word 4
 */
static inline u32 msg_last_bcast(struct tipc_msg *m)
{
	return msg_bits(m, 4, 16, 0xffff);
}

static inline u32 msg_bc_snd_nxt(struct tipc_msg *m)
{
	return msg_last_bcast(m) + 1;
}

static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 4, 16, 0xffff, n);
}

static inline u32 msg_nof_fragms(struct tipc_msg *m)
{
	return msg_bits(m, 4, 0, 0xffff);
}

static inline void msg_set_nof_fragms(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 4, 0, 0xffff, n);
}

static inline u32 msg_fragm_no(struct tipc_msg *m)
{
	return msg_bits(m, 4, 16, 0xffff);
}

static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 4, 16, 0xffff, n);
}

static inline u16 msg_next_sent(struct tipc_msg *m)
{
	return msg_bits(m, 4, 0, 0xffff);
}

static inline void msg_set_next_sent(struct tipc_msg *m, u16 n)
{
	msg_set_bits(m, 4, 0, 0xffff, n);
}

static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 4, 0, 0xffff, n);
}

static inline u32 msg_bc_netid(struct tipc_msg *m)
{
	return msg_word(m, 4);
}

static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
{
	msg_set_word(m, 4, id);
}

static inline u32 msg_link_selector(struct tipc_msg *m)
{
	if (msg_user(m) == MSG_FRAGMENTER)
		m = (void *)msg_data(m);
	return msg_bits(m, 4, 0, 1);
}

/*
 * Word 5
 */
static inline u16 msg_session(struct tipc_msg *m)
{
	return msg_bits(m, 5, 16, 0xffff);
}

static inline void msg_set_session(struct tipc_msg *m, u16 n)
{
	msg_set_bits(m, 5, 16, 0xffff, n);
}

static inline u32 msg_probe(struct tipc_msg *m)
{
	return msg_bits(m, 5, 0, 1);
}

static inline void msg_set_probe(struct tipc_msg *m, u32 val)
{
	msg_set_bits(m, 5, 0, 1, val);
}

static inline char msg_net_plane(struct tipc_msg *m)
{
	return msg_bits(m, 5, 1, 7) + 'A';
}

static inline void msg_set_net_plane(struct tipc_msg *m, char n)
{
	msg_set_bits(m, 5, 1, 7, (n - 'A'));
}

static inline u32 msg_linkprio(struct tipc_msg *m)
{
	return msg_bits(m, 5, 4, 0x1f);
}

static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 5, 4, 0x1f, n);
}

static inline u32 msg_bearer_id(struct tipc_msg *m)
{
	return msg_bits(m, 5, 9, 0x7);
}

static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 5, 9, 0x7, n);
}

static inline u32 msg_redundant_link(struct tipc_msg *m)
{
	return msg_bits(m, 5, 12, 0x1);
}

static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
{
	msg_set_bits(m, 5, 12, 0x1, r);
}

static inline u32 msg_peer_stopping(struct tipc_msg *m)
{
	return msg_bits(m, 5, 13, 0x1);
}

static inline void msg_set_peer_stopping(struct tipc_msg *m, u32 s)
{
	msg_set_bits(m, 5, 13, 0x1, s);
}

static inline bool msg_bc_ack_invalid(struct tipc_msg *m)
{
	switch (msg_user(m)) {
	case BCAST_PROTOCOL:
	case NAME_DISTRIBUTOR:
	case LINK_PROTOCOL:
		return msg_bits(m, 5, 14, 0x1);
	default:
		return false;
	}
}

static inline void msg_set_bc_ack_invalid(struct tipc_msg *m, bool invalid)
{
	msg_set_bits(m, 5, 14, 0x1, invalid);
}

static inline char *msg_media_addr(struct tipc_msg *m)
{
	return (char *)&m->hdr[TIPC_MEDIA_INFO_OFFSET];
}

static inline u32 msg_bc_gap(struct tipc_msg *m)
{
	return msg_bits(m, 8, 0, 0x3ff);
}

static inline void msg_set_bc_gap(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 8, 0, 0x3ff, n);
}

/*
 * Word 9
 */
static inline u16 msg_msgcnt(struct tipc_msg *m)
{
	return msg_bits(m, 9, 16, 0xffff);
}

static inline void msg_set_msgcnt(struct tipc_msg *m, u16 n)
{
	msg_set_bits(m, 9, 16, 0xffff, n);
}

static inline u16 msg_syncpt(struct tipc_msg *m)
{
	return msg_bits(m, 9, 16, 0xffff);
}

static inline void msg_set_syncpt(struct tipc_msg *m, u16 n)
{
	msg_set_bits(m, 9, 16, 0xffff, n);
}

static inline u32 msg_conn_ack(struct tipc_msg *m)
{
	return msg_bits(m, 9, 16, 0xffff);
}

static inline void msg_set_conn_ack(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 9, 16, 0xffff, n);
}

static inline u16 msg_adv_win(struct tipc_msg *m)
{
	return msg_bits(m, 9, 0, 0xffff);
}

static inline void msg_set_adv_win(struct tipc_msg *m, u16 n)
{
	msg_set_bits(m, 9, 0, 0xffff, n);
}

static inline u32 msg_max_pkt(struct tipc_msg *m)
{
	return msg_bits(m, 9, 16, 0xffff) * 4;
}

static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 9, 16, 0xffff, (n / 4));
}

static inline u32 msg_link_tolerance(struct tipc_msg *m)
{
	return msg_bits(m, 9, 0, 0xffff);
}

static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 9, 0, 0xffff, n);
}

static inline u16 msg_grp_bc_syncpt(struct tipc_msg *m)
{
	return msg_bits(m, 9, 16, 0xffff);
}

static inline void msg_set_grp_bc_syncpt(struct tipc_msg *m, u16 n)
{
	msg_set_bits(m, 9, 16, 0xffff, n);
}

static inline u16 msg_grp_bc_acked(struct tipc_msg *m)
{
	return msg_bits(m, 9, 16, 0xffff);
}

static inline void msg_set_grp_bc_acked(struct tipc_msg *m, u16 n)
{
	msg_set_bits(m, 9, 16, 0xffff, n);
}

static inline u16 msg_grp_remitted(struct tipc_msg *m)
{
	return msg_bits(m, 9, 16, 0xffff);
}

static inline void msg_set_grp_remitted(struct tipc_msg *m, u16 n)
{
	msg_set_bits(m, 9, 16, 0xffff, n);
}

/* Word 10
 */
static inline u16 msg_grp_evt(struct tipc_msg *m)
{
	return msg_bits(m, 10, 0, 0x3);
}

static inline void msg_set_grp_evt(struct tipc_msg *m, int n)
{
	msg_set_bits(m, 10, 0, 0x3, n);
}

static inline u16 msg_grp_bc_ack_req(struct tipc_msg *m)
{
	return msg_bits(m, 10, 0, 0x1);
}

static inline void msg_set_grp_bc_ack_req(struct tipc_msg *m, bool n)
{
	msg_set_bits(m, 10, 0, 0x1, n);
}

static inline u16 msg_grp_bc_seqno(struct tipc_msg *m)
{
	return msg_bits(m, 10, 16, 0xffff);
}

static inline void msg_set_grp_bc_seqno(struct tipc_msg *m, u32 n)
{
	msg_set_bits(m, 10, 16, 0xffff, n);
}

static inline bool msg_peer_link_is_up(struct tipc_msg *m)
{
	if (likely(msg_user(m) != LINK_PROTOCOL))
		return true;
	if (msg_type(m) == STATE_MSG)
		return true;
	return false;
}

static inline bool msg_peer_node_is_up(struct tipc_msg *m)
{
	if (msg_peer_link_is_up(m))
		return true;
	return msg_redundant_link(m);
}

static inline bool msg_is_reset(struct tipc_msg *hdr)
{
	return (msg_user(hdr) == LINK_PROTOCOL) && (msg_type(hdr) == RESET_MSG);
}

/* Word 13
 */
static inline void msg_set_peer_net_hash(struct tipc_msg *m, u32 n)
{
	msg_set_word(m, 13, n);
}

static inline u32 msg_peer_net_hash(struct tipc_msg *m)
{
	return msg_word(m, 13);
}

/* Word 14
 */
static inline u32 msg_sugg_node_addr(struct tipc_msg *m)
{
	return msg_word(m, 14);
}

static inline void msg_set_sugg_node_addr(struct tipc_msg *m, u32 n)
{
	msg_set_word(m, 14, n);
}

static inline void msg_set_node_id(struct tipc_msg *hdr, u8 *id)
{
	memcpy(msg_data(hdr), id, 16);
}

static inline u8 *msg_node_id(struct tipc_msg *hdr)
{
	return (u8 *)msg_data(hdr);
}

struct sk_buff *tipc_buf_acquire(u32 size, gfp_t gfp);
bool tipc_msg_validate(struct sk_buff **_skb);
bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, int err);
void tipc_skb_reject(struct net *net, int err, struct sk_buff *skb,
		     struct sk_buff_head *xmitq);
void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
		   u32 hsize, u32 destnode);
struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
				uint data_sz, u32 dnode, u32 onode,
				u32 dport, u32 oport, int errcode);
int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
bool tipc_msg_try_bundle(struct sk_buff *tskb, struct sk_buff **skb, u32 mss,
			 u32 dnode, bool *new_bundle);
bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos);
int tipc_msg_fragment(struct sk_buff *skb, const struct tipc_msg *hdr,
		      int pktmax, struct sk_buff_head *frags);
int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
		   int offset, int dsz, int mtu, struct sk_buff_head *list);
int tipc_msg_append(struct tipc_msg *hdr, struct msghdr *m, int dlen,
		    int mss, struct sk_buff_head *txq);
bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err);
bool tipc_msg_assemble(struct sk_buff_head *list);
bool tipc_msg_reassemble(struct sk_buff_head *list, struct sk_buff_head *rcvq);
bool tipc_msg_pskb_copy(u32 dst, struct sk_buff_head *msg,
			struct sk_buff_head *cpy);
void __tipc_skb_queue_sorted(struct sk_buff_head *list, u16 seqno,
			     struct sk_buff *skb);
bool tipc_msg_skb_clone(struct sk_buff_head *msg, struct sk_buff_head *cpy);

static inline u16 buf_seqno(struct sk_buff *skb)
{
	return msg_seqno(buf_msg(skb));
}

static inline int buf_roundup_len(struct sk_buff *skb)
{
	return (skb->len / 1024 + 1) * 1024;
}

/* tipc_skb_peek(): peek and reserve first buffer in list
 * @list: list to be peeked in
 * Returns pointer to first buffer in list, if any
 */
static inline struct sk_buff *tipc_skb_peek(struct sk_buff_head *list,
					    spinlock_t *lock)
{
	struct sk_buff *skb;

	spin_lock_bh(lock);
	skb = skb_peek(list);
	if (skb)
		skb_get(skb);
	spin_unlock_bh(lock);
	return skb;
}

/* tipc_skb_peek_port(): find a destination port, ignoring all destinations
 *                       up to and including 'filter'.
 * Note: ignoring previously tried destinations minimizes the risk of
 *       contention on the socket lock
 * @list: list to be peeked in
 * @filter: last destination to be ignored from search
 * Returns a destination port number, of applicable.
 */
static inline u32 tipc_skb_peek_port(struct sk_buff_head *list, u32 filter)
{
	struct sk_buff *skb;
	u32 dport = 0;
	bool ignore = true;

	spin_lock_bh(&list->lock);
	skb_queue_walk(list, skb) {
		dport = msg_destport(buf_msg(skb));
		if (!filter || skb_queue_is_last(list, skb))
			break;
		if (dport == filter)
			ignore = false;
		else if (!ignore)
			break;
	}
	spin_unlock_bh(&list->lock);
	return dport;
}

/* tipc_skb_dequeue(): unlink first buffer with dest 'dport' from list
 * @list: list to be unlinked from
 * @dport: selection criteria for buffer to unlink
 */
static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list,
					       u32 dport)
{
	struct sk_buff *_skb, *tmp, *skb = NULL;

	spin_lock_bh(&list->lock);
	skb_queue_walk_safe(list, _skb, tmp) {
		if (msg_destport(buf_msg(_skb)) == dport) {
			__skb_unlink(_skb, list);
			skb = _skb;
			break;
		}
	}
	spin_unlock_bh(&list->lock);
	return skb;
}

/* tipc_skb_queue_splice_tail - append an skb list to lock protected list
 * @list: the new list to append. Not lock protected
 * @head: target list. Lock protected.
 */
static inline void tipc_skb_queue_splice_tail(struct sk_buff_head *list,
					      struct sk_buff_head *head)
{
	spin_lock_bh(&head->lock);
	skb_queue_splice_tail(list, head);
	spin_unlock_bh(&head->lock);
}

/* tipc_skb_queue_splice_tail_init - merge two lock protected skb lists
 * @list: the new list to add. Lock protected. Will be reinitialized
 * @head: target list. Lock protected.
 */
static inline void tipc_skb_queue_splice_tail_init(struct sk_buff_head *list,
						   struct sk_buff_head *head)
{
	struct sk_buff_head tmp;

	__skb_queue_head_init(&tmp);

	spin_lock_bh(&list->lock);
	skb_queue_splice_tail_init(list, &tmp);
	spin_unlock_bh(&list->lock);
	tipc_skb_queue_splice_tail(&tmp, head);
}

/* __tipc_skb_dequeue() - dequeue the head skb according to expected seqno
 * @list: list to be dequeued from
 * @seqno: seqno of the expected msg
 *
 * returns skb dequeued from the list if its seqno is less than or equal to
 * the expected one, otherwise the skb is still hold
 *
 * Note: must be used with appropriate locks held only
 */
static inline struct sk_buff *__tipc_skb_dequeue(struct sk_buff_head *list,
						 u16 seqno)
{
	struct sk_buff *skb = skb_peek(list);

	if (skb && less_eq(buf_seqno(skb), seqno)) {
		__skb_unlink(skb, list);
		return skb;
	}
	return NULL;
}

#endif