summaryrefslogtreecommitdiff
path: root/net/rxrpc/ar-internal.h
blob: 2a2b0fdfb15792098548157328ca6fb7de1bc79c (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
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
/* AF_RXRPC internal definitions
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/atomic.h>
#include <linux/seqlock.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include "protocol.h"

#if 0
#define CHECK_SLAB_OKAY(X)				     \
	BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
	       (POISON_FREE << 8 | POISON_FREE))
#else
#define CHECK_SLAB_OKAY(X) do {} while (0)
#endif

#define FCRYPT_BSIZE 8
struct rxrpc_crypt {
	union {
		u8	x[FCRYPT_BSIZE];
		__be32	n[2];
	};
} __attribute__((aligned(8)));

#define rxrpc_queue_work(WS)	queue_work(rxrpc_workqueue, (WS))
#define rxrpc_queue_delayed_work(WS,D)	\
	queue_delayed_work(rxrpc_workqueue, (WS), (D))

struct rxrpc_connection;

/*
 * Mark applied to socket buffers.
 */
enum rxrpc_skb_mark {
	RXRPC_SKB_MARK_DATA,		/* data message */
	RXRPC_SKB_MARK_FINAL_ACK,	/* final ACK received message */
	RXRPC_SKB_MARK_BUSY,		/* server busy message */
	RXRPC_SKB_MARK_REMOTE_ABORT,	/* remote abort message */
	RXRPC_SKB_MARK_LOCAL_ABORT,	/* local abort message */
	RXRPC_SKB_MARK_NET_ERROR,	/* network error message */
	RXRPC_SKB_MARK_LOCAL_ERROR,	/* local error message */
	RXRPC_SKB_MARK_NEW_CALL,	/* local error message */
};

/*
 * sk_state for RxRPC sockets
 */
enum {
	RXRPC_UNBOUND = 0,
	RXRPC_CLIENT_UNBOUND,		/* Unbound socket used as client */
	RXRPC_CLIENT_BOUND,		/* client local address bound */
	RXRPC_SERVER_BOUND,		/* server local address bound */
	RXRPC_SERVER_BOUND2,		/* second server local address bound */
	RXRPC_SERVER_LISTENING,		/* server listening for connections */
	RXRPC_SERVER_LISTEN_DISABLED,	/* server listening disabled */
	RXRPC_CLOSE,			/* socket is being closed */
};

/*
 * Per-network namespace data.
 */
struct rxrpc_net {
	struct proc_dir_entry	*proc_net;	/* Subdir in /proc/net */
	u32			epoch;		/* Local epoch for detecting local-end reset */
	struct list_head	calls;		/* List of calls active in this namespace */
	rwlock_t		call_lock;	/* Lock for ->calls */
	atomic_t		nr_calls;	/* Count of allocated calls */

	struct list_head	conn_proc_list;	/* List of conns in this namespace for proc */
	struct list_head	service_conns;	/* Service conns in this namespace */
	rwlock_t		conn_lock;	/* Lock for ->conn_proc_list, ->service_conns */
	struct work_struct	service_conn_reaper;
	struct timer_list	service_conn_reap_timer;

	unsigned int		nr_client_conns;
	unsigned int		nr_active_client_conns;
	bool			kill_all_client_conns;
	bool			live;
	spinlock_t		client_conn_cache_lock; /* Lock for ->*_client_conns */
	spinlock_t		client_conn_discard_lock; /* Prevent multiple discarders */
	struct list_head	waiting_client_conns;
	struct list_head	active_client_conns;
	struct list_head	idle_client_conns;
	struct work_struct	client_conn_reaper;
	struct timer_list	client_conn_reap_timer;

	struct list_head	local_endpoints;
	struct mutex		local_mutex;	/* Lock for ->local_endpoints */

	DECLARE_HASHTABLE	(peer_hash, 10);
	spinlock_t		peer_hash_lock;	/* Lock for ->peer_hash */

#define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
	u8			peer_keepalive_cursor;
	ktime_t			peer_keepalive_base;
	struct hlist_head	peer_keepalive[RXRPC_KEEPALIVE_TIME + 1];
	struct hlist_head	peer_keepalive_new;
	struct timer_list	peer_keepalive_timer;
	struct work_struct	peer_keepalive_work;
};

/*
 * Service backlog preallocation.
 *
 * This contains circular buffers of preallocated peers, connections and calls
 * for incoming service calls and their head and tail pointers.  This allows
 * calls to be set up in the data_ready handler, thereby avoiding the need to
 * shuffle packets around so much.
 */
struct rxrpc_backlog {
	unsigned short		peer_backlog_head;
	unsigned short		peer_backlog_tail;
	unsigned short		conn_backlog_head;
	unsigned short		conn_backlog_tail;
	unsigned short		call_backlog_head;
	unsigned short		call_backlog_tail;
#define RXRPC_BACKLOG_MAX	32
	struct rxrpc_peer	*peer_backlog[RXRPC_BACKLOG_MAX];
	struct rxrpc_connection	*conn_backlog[RXRPC_BACKLOG_MAX];
	struct rxrpc_call	*call_backlog[RXRPC_BACKLOG_MAX];
};

/*
 * RxRPC socket definition
 */
struct rxrpc_sock {
	/* WARNING: sk has to be the first member */
	struct sock		sk;
	rxrpc_notify_new_call_t	notify_new_call; /* Func to notify of new call */
	rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
	struct rxrpc_local	*local;		/* local endpoint */
	struct rxrpc_backlog	*backlog;	/* Preallocation for services */
	spinlock_t		incoming_lock;	/* Incoming call vs service shutdown lock */
	struct list_head	sock_calls;	/* List of calls owned by this socket */
	struct list_head	to_be_accepted;	/* calls awaiting acceptance */
	struct list_head	recvmsg_q;	/* Calls awaiting recvmsg's attention  */
	rwlock_t		recvmsg_lock;	/* Lock for recvmsg_q */
	struct key		*key;		/* security for this socket */
	struct key		*securities;	/* list of server security descriptors */
	struct rb_root		calls;		/* User ID -> call mapping */
	unsigned long		flags;
#define RXRPC_SOCK_CONNECTED		0	/* connect_srx is set */
	rwlock_t		call_lock;	/* lock for calls */
	u32			min_sec_level;	/* minimum security level */
#define RXRPC_SECURITY_MAX	RXRPC_SECURITY_ENCRYPT
	bool			exclusive;	/* Exclusive connection for a client socket */
	u16			second_service;	/* Additional service bound to the endpoint */
	struct {
		/* Service upgrade information */
		u16		from;		/* Service ID to upgrade (if not 0) */
		u16		to;		/* service ID to upgrade to */
	} service_upgrade;
	sa_family_t		family;		/* Protocol family created with */
	struct sockaddr_rxrpc	srx;		/* Primary Service/local addresses */
	struct sockaddr_rxrpc	connect_srx;	/* Default client address from connect() */
};

#define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)

/*
 * CPU-byteorder normalised Rx packet header.
 */
struct rxrpc_host_header {
	u32		epoch;		/* client boot timestamp */
	u32		cid;		/* connection and channel ID */
	u32		callNumber;	/* call ID (0 for connection-level packets) */
	u32		seq;		/* sequence number of pkt in call stream */
	u32		serial;		/* serial number of pkt sent to network */
	u8		type;		/* packet type */
	u8		flags;		/* packet flags */
	u8		userStatus;	/* app-layer defined status */
	u8		securityIndex;	/* security protocol ID */
	union {
		u16	_rsvd;		/* reserved */
		u16	cksum;		/* kerberos security checksum */
	};
	u16		serviceId;	/* service ID */
} __packed;

/*
 * RxRPC socket buffer private variables
 * - max 48 bytes (struct sk_buff::cb)
 */
struct rxrpc_skb_priv {
	union {
		u8		nr_jumbo;	/* Number of jumbo subpackets */
	};
	union {
		int		remain;		/* amount of space remaining for next write */
	};

	struct rxrpc_host_header hdr;		/* RxRPC packet header from this packet */
};

#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)

/*
 * RxRPC security module interface
 */
struct rxrpc_security {
	const char		*name;		/* name of this service */
	u8			security_index;	/* security type provided */

	/* Initialise a security service */
	int (*init)(void);

	/* Clean up a security service */
	void (*exit)(void);

	/* initialise a connection's security */
	int (*init_connection_security)(struct rxrpc_connection *);

	/* prime a connection's packet security */
	int (*prime_packet_security)(struct rxrpc_connection *);

	/* impose security on a packet */
	int (*secure_packet)(struct rxrpc_call *,
			     struct sk_buff *,
			     size_t,
			     void *);

	/* verify the security on a received packet */
	int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
			     unsigned int, unsigned int, rxrpc_seq_t, u16);

	/* Locate the data in a received packet that has been verified. */
	void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
			    unsigned int *, unsigned int *);

	/* issue a challenge */
	int (*issue_challenge)(struct rxrpc_connection *);

	/* respond to a challenge */
	int (*respond_to_challenge)(struct rxrpc_connection *,
				    struct sk_buff *,
				    u32 *);

	/* verify a response */
	int (*verify_response)(struct rxrpc_connection *,
			       struct sk_buff *,
			       u32 *);

	/* clear connection security */
	void (*clear)(struct rxrpc_connection *);
};

/*
 * RxRPC local transport endpoint description
 * - owned by a single AF_RXRPC socket
 * - pointed to by transport socket struct sk_user_data
 */
struct rxrpc_local {
	struct rcu_head		rcu;
	atomic_t		usage;
	struct rxrpc_net	*rxnet;		/* The network ns in which this resides */
	struct list_head	link;
	struct socket		*socket;	/* my UDP socket */
	struct work_struct	processor;
	struct rxrpc_sock __rcu	*service;	/* Service(s) listening on this endpoint */
	struct rw_semaphore	defrag_sem;	/* control re-enablement of IP DF bit */
	struct sk_buff_head	reject_queue;	/* packets awaiting rejection */
	struct sk_buff_head	event_queue;	/* endpoint event packets awaiting processing */
	struct rb_root		client_conns;	/* Client connections by socket params */
	spinlock_t		client_conns_lock; /* Lock for client_conns */
	spinlock_t		lock;		/* access lock */
	rwlock_t		services_lock;	/* lock for services list */
	int			debug_id;	/* debug ID for printks */
	bool			dead;
	bool			service_closed;	/* Service socket closed */
	struct sockaddr_rxrpc	srx;		/* local address */
};

/*
 * RxRPC remote transport endpoint definition
 * - matched by local endpoint, remote port, address and protocol type
 */
struct rxrpc_peer {
	struct rcu_head		rcu;		/* This must be first */
	atomic_t		usage;
	unsigned long		hash_key;
	struct hlist_node	hash_link;
	struct rxrpc_local	*local;
	struct hlist_head	error_targets;	/* targets for net error distribution */
	struct work_struct	error_distributor;
	struct rb_root		service_conns;	/* Service connections */
	struct hlist_node	keepalive_link;	/* Link in net->peer_keepalive[] */
	time64_t		last_tx_at;	/* Last time packet sent here */
	seqlock_t		service_conn_lock;
	spinlock_t		lock;		/* access lock */
	unsigned int		if_mtu;		/* interface MTU for this peer */
	unsigned int		mtu;		/* network MTU for this peer */
	unsigned int		maxdata;	/* data size (MTU - hdrsize) */
	unsigned short		hdrsize;	/* header size (IP + UDP + RxRPC) */
	int			debug_id;	/* debug ID for printks */
	int			error_report;	/* Net (+0) or local (+1000000) to distribute */
#define RXRPC_LOCAL_ERROR_OFFSET 1000000
	struct sockaddr_rxrpc	srx;		/* remote address */

	/* calculated RTT cache */
#define RXRPC_RTT_CACHE_SIZE 32
	ktime_t			rtt_last_req;	/* Time of last RTT request */
	u64			rtt;		/* Current RTT estimate (in nS) */
	u64			rtt_sum;	/* Sum of cache contents */
	u64			rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
	u8			rtt_cursor;	/* next entry at which to insert */
	u8			rtt_usage;	/* amount of cache actually used */

	u8			cong_cwnd;	/* Congestion window size */
};

/*
 * Keys for matching a connection.
 */
struct rxrpc_conn_proto {
	union {
		struct {
			u32	epoch;		/* epoch of this connection */
			u32	cid;		/* connection ID */
		};
		u64		index_key;
	};
};

struct rxrpc_conn_parameters {
	struct rxrpc_local	*local;		/* Representation of local endpoint */
	struct rxrpc_peer	*peer;		/* Remote endpoint */
	struct key		*key;		/* Security details */
	bool			exclusive;	/* T if conn is exclusive */
	bool			upgrade;	/* T if service ID can be upgraded */
	u16			service_id;	/* Service ID for this connection */
	u32			security_level;	/* Security level selected */
};

/*
 * Bits in the connection flags.
 */
enum rxrpc_conn_flag {
	RXRPC_CONN_HAS_IDR,		/* Has a client conn ID assigned */
	RXRPC_CONN_IN_SERVICE_CONNS,	/* Conn is in peer->service_conns */
	RXRPC_CONN_IN_CLIENT_CONNS,	/* Conn is in local->client_conns */
	RXRPC_CONN_EXPOSED,		/* Conn has extra ref for exposure */
	RXRPC_CONN_DONT_REUSE,		/* Don't reuse this connection */
	RXRPC_CONN_COUNTED,		/* Counted by rxrpc_nr_client_conns */
	RXRPC_CONN_PROBING_FOR_UPGRADE,	/* Probing for service upgrade */
	RXRPC_CONN_FINAL_ACK_0,		/* Need final ACK for channel 0 */
	RXRPC_CONN_FINAL_ACK_1,		/* Need final ACK for channel 1 */
	RXRPC_CONN_FINAL_ACK_2,		/* Need final ACK for channel 2 */
	RXRPC_CONN_FINAL_ACK_3,		/* Need final ACK for channel 3 */
};

#define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |	\
				   (1UL << RXRPC_CONN_FINAL_ACK_1) |	\
				   (1UL << RXRPC_CONN_FINAL_ACK_2) |	\
				   (1UL << RXRPC_CONN_FINAL_ACK_3))

/*
 * Events that can be raised upon a connection.
 */
enum rxrpc_conn_event {
	RXRPC_CONN_EV_CHALLENGE,	/* Send challenge packet */
};

/*
 * The connection cache state.
 */
enum rxrpc_conn_cache_state {
	RXRPC_CONN_CLIENT_INACTIVE,	/* Conn is not yet listed */
	RXRPC_CONN_CLIENT_WAITING,	/* Conn is on wait list, waiting for capacity */
	RXRPC_CONN_CLIENT_ACTIVE,	/* Conn is on active list, doing calls */
	RXRPC_CONN_CLIENT_UPGRADE,	/* Conn is on active list, probing for upgrade */
	RXRPC_CONN_CLIENT_CULLED,	/* Conn is culled and delisted, doing calls */
	RXRPC_CONN_CLIENT_IDLE,		/* Conn is on idle list, doing mostly nothing */
	RXRPC_CONN__NR_CACHE_STATES
};

/*
 * The connection protocol state.
 */
enum rxrpc_conn_proto_state {
	RXRPC_CONN_UNUSED,		/* Connection not yet attempted */
	RXRPC_CONN_CLIENT,		/* Client connection */
	RXRPC_CONN_SERVICE_PREALLOC,	/* Service connection preallocation */
	RXRPC_CONN_SERVICE_UNSECURED,	/* Service unsecured connection */
	RXRPC_CONN_SERVICE_CHALLENGING,	/* Service challenging for security */
	RXRPC_CONN_SERVICE,		/* Service secured connection */
	RXRPC_CONN_REMOTELY_ABORTED,	/* Conn aborted by peer */
	RXRPC_CONN_LOCALLY_ABORTED,	/* Conn aborted locally */
	RXRPC_CONN__NR_STATES
};

/*
 * RxRPC connection definition
 * - matched by { local, peer, epoch, conn_id, direction }
 * - each connection can only handle four simultaneous calls
 */
struct rxrpc_connection {
	struct rxrpc_conn_proto	proto;
	struct rxrpc_conn_parameters params;

	atomic_t		usage;
	struct rcu_head		rcu;
	struct list_head	cache_link;

	spinlock_t		channel_lock;
	unsigned char		active_chans;	/* Mask of active channels */
#define RXRPC_ACTIVE_CHANS_MASK	((1 << RXRPC_MAXCALLS) - 1)
	struct list_head	waiting_calls;	/* Calls waiting for channels */
	struct rxrpc_channel {
		unsigned long		final_ack_at;	/* Time at which to issue final ACK */
		struct rxrpc_call __rcu	*call;		/* Active call */
		u32			call_id;	/* ID of current call */
		u32			call_counter;	/* Call ID counter */
		u32			last_call;	/* ID of last call */
		u8			last_type;	/* Type of last packet */
		union {
			u32		last_seq;
			u32		last_abort;
		};
	} channels[RXRPC_MAXCALLS];

	struct timer_list	timer;		/* Conn event timer */
	struct work_struct	processor;	/* connection event processor */
	union {
		struct rb_node	client_node;	/* Node in local->client_conns */
		struct rb_node	service_node;	/* Node in peer->service_conns */
	};
	struct list_head	proc_link;	/* link in procfs list */
	struct list_head	link;		/* link in master connection list */
	struct sk_buff_head	rx_queue;	/* received conn-level packets */
	const struct rxrpc_security *security;	/* applied security module */
	struct key		*server_key;	/* security for this service */
	struct crypto_skcipher	*cipher;	/* encryption handle */
	struct rxrpc_crypt	csum_iv;	/* packet checksum base */
	unsigned long		flags;
	unsigned long		events;
	unsigned long		idle_timestamp;	/* Time at which last became idle */
	spinlock_t		state_lock;	/* state-change lock */
	enum rxrpc_conn_cache_state cache_state;
	enum rxrpc_conn_proto_state state;	/* current state of connection */
	u32			local_abort;	/* local abort code */
	u32			remote_abort;	/* remote abort code */
	int			debug_id;	/* debug ID for printks */
	atomic_t		serial;		/* packet serial number counter */
	unsigned int		hi_serial;	/* highest serial number received */
	u32			security_nonce;	/* response re-use preventer */
	u16			service_id;	/* Service ID, possibly upgraded */
	u8			size_align;	/* data size alignment (for security) */
	u8			security_size;	/* security header size */
	u8			security_ix;	/* security type */
	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
};

/*
 * Flags in call->flags.
 */
enum rxrpc_call_flag {
	RXRPC_CALL_RELEASED,		/* call has been released - no more message to userspace */
	RXRPC_CALL_HAS_USERID,		/* has a user ID attached */
	RXRPC_CALL_IS_SERVICE,		/* Call is service call */
	RXRPC_CALL_EXPOSED,		/* The call was exposed to the world */
	RXRPC_CALL_RX_LAST,		/* Received the last packet (at rxtx_top) */
	RXRPC_CALL_TX_LAST,		/* Last packet in Tx buffer (at rxtx_top) */
	RXRPC_CALL_TX_LASTQ,		/* Last packet has been queued */
	RXRPC_CALL_SEND_PING,		/* A ping will need to be sent */
	RXRPC_CALL_PINGING,		/* Ping in process */
	RXRPC_CALL_RETRANS_TIMEOUT,	/* Retransmission due to timeout occurred */
};

/*
 * Events that can be raised on a call.
 */
enum rxrpc_call_event {
	RXRPC_CALL_EV_ACK,		/* need to generate ACK */
	RXRPC_CALL_EV_ABORT,		/* need to generate abort */
	RXRPC_CALL_EV_RESEND,		/* Tx resend required */
	RXRPC_CALL_EV_PING,		/* Ping send required */
	RXRPC_CALL_EV_EXPIRED,		/* Expiry occurred */
	RXRPC_CALL_EV_ACK_LOST,		/* ACK may be lost, send ping */
};

/*
 * The states that a call can be in.
 */
enum rxrpc_call_state {
	RXRPC_CALL_UNINITIALISED,
	RXRPC_CALL_CLIENT_AWAIT_CONN,	/* - client waiting for connection to become available */
	RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
	RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
	RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
	RXRPC_CALL_SERVER_PREALLOC,	/* - service preallocation */
	RXRPC_CALL_SERVER_SECURING,	/* - server securing request connection */
	RXRPC_CALL_SERVER_ACCEPTING,	/* - server accepting request */
	RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
	RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
	RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
	RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
	RXRPC_CALL_COMPLETE,		/* - call complete */
	NR__RXRPC_CALL_STATES
};

/*
 * Call Tx congestion management modes.
 */
enum rxrpc_congest_mode {
	RXRPC_CALL_SLOW_START,
	RXRPC_CALL_CONGEST_AVOIDANCE,
	RXRPC_CALL_PACKET_LOSS,
	RXRPC_CALL_FAST_RETRANSMIT,
	NR__RXRPC_CONGEST_MODES
};

/*
 * RxRPC call definition
 * - matched by { connection, call_id }
 */
struct rxrpc_call {
	struct rcu_head		rcu;
	struct rxrpc_connection	*conn;		/* connection carrying call */
	struct rxrpc_peer	*peer;		/* Peer record for remote address */
	struct rxrpc_sock __rcu	*socket;	/* socket responsible */
	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
	struct mutex		user_mutex;	/* User access mutex */
	unsigned long		ack_at;		/* When deferred ACK needs to happen */
	unsigned long		ack_lost_at;	/* When ACK is figured as lost */
	unsigned long		resend_at;	/* When next resend needs to happen */
	unsigned long		ping_at;	/* When next to send a ping */
	unsigned long		keepalive_at;	/* When next to send a keepalive ping */
	unsigned long		expect_rx_by;	/* When we expect to get a packet by */
	unsigned long		expect_req_by;	/* When we expect to get a request DATA packet by */
	unsigned long		expect_term_by;	/* When we expect call termination by */
	u32			next_rx_timo;	/* Timeout for next Rx packet (jif) */
	u32			next_req_timo;	/* Timeout for next Rx request packet (jif) */
	struct timer_list	timer;		/* Combined event timer */
	struct work_struct	processor;	/* Event processor */
	rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
	struct list_head	link;		/* link in master call list */
	struct list_head	chan_wait_link;	/* Link in conn->waiting_calls */
	struct hlist_node	error_link;	/* link in error distribution list */
	struct list_head	accept_link;	/* Link in rx->acceptq */
	struct list_head	recvmsg_link;	/* Link in rx->recvmsg_q */
	struct list_head	sock_link;	/* Link in rx->sock_calls */
	struct rb_node		sock_node;	/* Node in rx->calls */
	struct sk_buff		*tx_pending;	/* Tx socket buffer being filled */
	wait_queue_head_t	waitq;		/* Wait queue for channel or Tx */
	s64			tx_total_len;	/* Total length left to be transmitted (or -1) */
	__be32			crypto_buf[2];	/* Temporary packet crypto buffer */
	unsigned long		user_call_ID;	/* user-defined call ID */
	unsigned long		flags;
	unsigned long		events;
	spinlock_t		lock;
	spinlock_t		notify_lock;	/* Kernel notification lock */
	rwlock_t		state_lock;	/* lock for state transition */
	u32			abort_code;	/* Local/remote abort code */
	int			error;		/* Local error incurred */
	enum rxrpc_call_state	state;		/* current state of call */
	enum rxrpc_call_completion completion;	/* Call completion condition */
	atomic_t		usage;
	u16			service_id;	/* service ID */
	u8			security_ix;	/* Security type */
	u32			call_id;	/* call ID on connection  */
	u32			cid;		/* connection ID plus channel index */
	int			debug_id;	/* debug ID for printks */
	unsigned short		rx_pkt_offset;	/* Current recvmsg packet offset */
	unsigned short		rx_pkt_len;	/* Current recvmsg packet len */

	/* Rx/Tx circular buffer, depending on phase.
	 *
	 * In the Rx phase, packets are annotated with 0 or the number of the
	 * segment of a jumbo packet each buffer refers to.  There can be up to
	 * 47 segments in a maximum-size UDP packet.
	 *
	 * In the Tx phase, packets are annotated with which buffers have been
	 * acked.
	 */
#define RXRPC_RXTX_BUFF_SIZE	64
#define RXRPC_RXTX_BUFF_MASK	(RXRPC_RXTX_BUFF_SIZE - 1)
#define RXRPC_INIT_RX_WINDOW_SIZE 32
	struct sk_buff		**rxtx_buffer;
	u8			*rxtx_annotations;
#define RXRPC_TX_ANNO_ACK	0
#define RXRPC_TX_ANNO_UNACK	1
#define RXRPC_TX_ANNO_NAK	2
#define RXRPC_TX_ANNO_RETRANS	3
#define RXRPC_TX_ANNO_MASK	0x03
#define RXRPC_TX_ANNO_LAST	0x04
#define RXRPC_TX_ANNO_RESENT	0x08

#define RXRPC_RX_ANNO_JUMBO	0x3f		/* Jumbo subpacket number + 1 if not zero */
#define RXRPC_RX_ANNO_JLAST	0x40		/* Set if last element of a jumbo packet */
#define RXRPC_RX_ANNO_VERIFIED	0x80		/* Set if verified and decrypted */
	rxrpc_seq_t		tx_hard_ack;	/* Dead slot in buffer; the first transmitted but
						 * not hard-ACK'd packet follows this.
						 */
	rxrpc_seq_t		tx_top;		/* Highest Tx slot allocated. */

	/* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
	 * is fixed, we keep these numbers in terms of segments (ie. DATA
	 * packets) rather than bytes.
	 */
#define RXRPC_TX_SMSS		RXRPC_JUMBO_DATALEN
	u8			cong_cwnd;	/* Congestion window size */
	u8			cong_extra;	/* Extra to send for congestion management */
	u8			cong_ssthresh;	/* Slow-start threshold */
	enum rxrpc_congest_mode	cong_mode:8;	/* Congestion management mode */
	u8			cong_dup_acks;	/* Count of ACKs showing missing packets */
	u8			cong_cumul_acks; /* Cumulative ACK count */
	ktime_t			cong_tstamp;	/* Last time cwnd was changed */

	rxrpc_seq_t		rx_hard_ack;	/* Dead slot in buffer; the first received but not
						 * consumed packet follows this.
						 */
	rxrpc_seq_t		rx_top;		/* Highest Rx slot allocated. */
	rxrpc_seq_t		rx_expect_next;	/* Expected next packet sequence number */
	u8			rx_winsize;	/* Size of Rx window */
	u8			tx_winsize;	/* Maximum size of Tx window */
	bool			tx_phase;	/* T if transmission phase, F if receive phase */
	u8			nr_jumbo_bad;	/* Number of jumbo dups/exceeds-windows */

	/* receive-phase ACK management */
	u8			ackr_reason;	/* reason to ACK */
	u16			ackr_skew;	/* skew on packet being ACK'd */
	rxrpc_serial_t		ackr_serial;	/* serial of packet being ACK'd */
	rxrpc_seq_t		ackr_prev_seq;	/* previous sequence number received */
	rxrpc_seq_t		ackr_consumed;	/* Highest packet shown consumed */
	rxrpc_seq_t		ackr_seen;	/* Highest packet shown seen */

	/* ping management */
	rxrpc_serial_t		ping_serial;	/* Last ping sent */
	ktime_t			ping_time;	/* Time last ping sent */

	/* transmission-phase ACK management */
	ktime_t			acks_latest_ts;	/* Timestamp of latest ACK received */
	rxrpc_serial_t		acks_latest;	/* serial number of latest ACK received */
	rxrpc_seq_t		acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
	rxrpc_seq_t		acks_lost_top;	/* tx_top at the time lost-ack ping sent */
	rxrpc_serial_t		acks_lost_ping;	/* Serial number of probe ACK */
};

/*
 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 */
struct rxrpc_ack_summary {
	u8			ack_reason;
	u8			nr_acks;		/* Number of ACKs in packet */
	u8			nr_nacks;		/* Number of NACKs in packet */
	u8			nr_new_acks;		/* Number of new ACKs in packet */
	u8			nr_new_nacks;		/* Number of new NACKs in packet */
	u8			nr_rot_new_acks;	/* Number of rotated new ACKs */
	bool			new_low_nack;		/* T if new low NACK found */
	bool			retrans_timeo;		/* T if reTx due to timeout happened */
	u8			flight_size;		/* Number of unreceived transmissions */
	/* Place to stash values for tracing */
	enum rxrpc_congest_mode	mode:8;
	u8			cwnd;
	u8			ssthresh;
	u8			dup_acks;
	u8			cumulative_acks;
};

/*
 * sendmsg() cmsg-specified parameters.
 */
enum rxrpc_command {
	RXRPC_CMD_SEND_DATA,		/* send data message */
	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
	RXRPC_CMD_ACCEPT,		/* [server] accept incoming call */
	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
};

struct rxrpc_call_params {
	s64			tx_total_len;	/* Total Tx data length (if send data) */
	unsigned long		user_call_ID;	/* User's call ID */
	struct {
		u32		hard;		/* Maximum lifetime (sec) */
		u32		idle;		/* Max time since last data packet (msec) */
		u32		normal;		/* Max time since last call packet (msec) */
	} timeouts;
	u8			nr_timeouts;	/* Number of timeouts specified */
};

struct rxrpc_send_params {
	struct rxrpc_call_params call;
	u32			abort_code;	/* Abort code to Tx (if abort) */
	enum rxrpc_command	command : 8;	/* The command to implement */
	bool			exclusive;	/* Shared or exclusive call */
	bool			upgrade;	/* If the connection is upgradeable */
};

#include <trace/events/rxrpc.h>

/*
 * af_rxrpc.c
 */
extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
extern struct workqueue_struct *rxrpc_workqueue;

/*
 * call_accept.c
 */
int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
void rxrpc_discard_prealloc(struct rxrpc_sock *);
struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
					   struct rxrpc_connection *,
					   struct sk_buff *);
void rxrpc_accept_incoming_calls(struct rxrpc_local *);
struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
				     rxrpc_notify_rx_t);
int rxrpc_reject_call(struct rxrpc_sock *);

/*
 * call_event.c
 */
void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
		       enum rxrpc_propose_ack_trace);
void rxrpc_process_call(struct work_struct *);

static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
					   unsigned long expire_at,
					   unsigned long now,
					   enum rxrpc_timer_trace why)
{
	trace_rxrpc_timer(call, why, now);
	timer_reduce(&call->timer, expire_at);
}

/*
 * call_object.c
 */
extern const char *const rxrpc_call_states[];
extern const char *const rxrpc_call_completions[];
extern unsigned int rxrpc_max_call_lifetime;
extern struct kmem_cache *rxrpc_call_jar;

struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
					 struct rxrpc_conn_parameters *,
					 struct sockaddr_rxrpc *,
					 struct rxrpc_call_params *, gfp_t,
					 unsigned int);
int rxrpc_retry_client_call(struct rxrpc_sock *,
			    struct rxrpc_call *,
			    struct rxrpc_conn_parameters *,
			    struct sockaddr_rxrpc *,
			    gfp_t);
void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
			 struct sk_buff *);
void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
int rxrpc_prepare_call_for_retry(struct rxrpc_sock *, struct rxrpc_call *);
void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
bool __rxrpc_queue_call(struct rxrpc_call *);
bool rxrpc_queue_call(struct rxrpc_call *);
void rxrpc_see_call(struct rxrpc_call *);
void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
void rxrpc_cleanup_call(struct rxrpc_call *);
void rxrpc_destroy_all_calls(struct rxrpc_net *);

static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
{
	return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
}

static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
{
	return !rxrpc_is_service_call(call);
}

/*
 * Transition a call to the complete state.
 */
static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
					       enum rxrpc_call_completion compl,
					       u32 abort_code,
					       int error)
{
	if (call->state < RXRPC_CALL_COMPLETE) {
		call->abort_code = abort_code;
		call->error = error;
		call->completion = compl,
		call->state = RXRPC_CALL_COMPLETE;
		trace_rxrpc_call_complete(call);
		wake_up(&call->waitq);
		return true;
	}
	return false;
}

static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
					     enum rxrpc_call_completion compl,
					     u32 abort_code,
					     int error)
{
	bool ret;

	write_lock_bh(&call->state_lock);
	ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
	write_unlock_bh(&call->state_lock);
	return ret;
}

/*
 * Record that a call successfully completed.
 */
static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
{
	return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
}

static inline bool rxrpc_call_completed(struct rxrpc_call *call)
{
	bool ret;

	write_lock_bh(&call->state_lock);
	ret = __rxrpc_call_completed(call);
	write_unlock_bh(&call->state_lock);
	return ret;
}

/*
 * Record that a call is locally aborted.
 */
static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
				      rxrpc_seq_t seq,
				      u32 abort_code, int error)
{
	trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
			  abort_code, error);
	return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
					   abort_code, error);
}

static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
				    rxrpc_seq_t seq, u32 abort_code, int error)
{
	bool ret;

	write_lock_bh(&call->state_lock);
	ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
	write_unlock_bh(&call->state_lock);
	return ret;
}

/*
 * Abort a call due to a protocol error.
 */
static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
					struct sk_buff *skb,
					const char *eproto_why,
					const char *why,
					u32 abort_code)
{
	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);

	trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
	return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
}

#define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
	__rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
			     (abort_why), (abort_code))

/*
 * conn_client.c
 */
extern unsigned int rxrpc_max_client_connections;
extern unsigned int rxrpc_reap_client_connections;
extern unsigned long rxrpc_conn_idle_client_expiry;
extern unsigned long rxrpc_conn_idle_client_fast_expiry;
extern struct idr rxrpc_client_conn_ids;

void rxrpc_destroy_client_conn_ids(void);
int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
		       struct sockaddr_rxrpc *, gfp_t);
void rxrpc_expose_client_call(struct rxrpc_call *);
void rxrpc_disconnect_client_call(struct rxrpc_call *);
void rxrpc_put_client_conn(struct rxrpc_connection *);
void rxrpc_discard_expired_client_conns(struct work_struct *);
void rxrpc_destroy_all_client_connections(struct rxrpc_net *);

/*
 * conn_event.c
 */
void rxrpc_process_connection(struct work_struct *);

/*
 * conn_object.c
 */
extern unsigned int rxrpc_connection_expiry;
extern unsigned int rxrpc_closed_conn_expiry;

struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
						   struct sk_buff *);
void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
void rxrpc_disconnect_call(struct rxrpc_call *);
void rxrpc_kill_connection(struct rxrpc_connection *);
bool rxrpc_queue_conn(struct rxrpc_connection *);
void rxrpc_see_connection(struct rxrpc_connection *);
void rxrpc_get_connection(struct rxrpc_connection *);
struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
void rxrpc_put_service_conn(struct rxrpc_connection *);
void rxrpc_service_connection_reaper(struct work_struct *);
void rxrpc_destroy_all_connections(struct rxrpc_net *);

static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
{
	return conn->out_clientflag;
}

static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
{
	return !rxrpc_conn_is_client(conn);
}

static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
{
	if (!conn)
		return;

	if (rxrpc_conn_is_client(conn))
		rxrpc_put_client_conn(conn);
	else
		rxrpc_put_service_conn(conn);
}

static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
					   unsigned long expire_at)
{
	timer_reduce(&conn->timer, expire_at);
}

/*
 * conn_service.c
 */
struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
						     struct sk_buff *);
struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
void rxrpc_new_incoming_connection(struct rxrpc_sock *,
				   struct rxrpc_connection *, struct sk_buff *);
void rxrpc_unpublish_service_conn(struct rxrpc_connection *);

/*
 * input.c
 */
void rxrpc_data_ready(struct sock *);

/*
 * insecure.c
 */
extern const struct rxrpc_security rxrpc_no_security;

/*
 * key.c
 */
extern struct key_type key_type_rxrpc;
extern struct key_type key_type_rxrpc_s;

int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
			      u32);

/*
 * local_event.c
 */
extern void rxrpc_process_local_events(struct rxrpc_local *);

/*
 * local_object.c
 */
struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
void __rxrpc_put_local(struct rxrpc_local *);
void rxrpc_destroy_all_locals(struct rxrpc_net *);

static inline void rxrpc_get_local(struct rxrpc_local *local)
{
	atomic_inc(&local->usage);
}

static inline
struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
{
	return atomic_inc_not_zero(&local->usage) ? local : NULL;
}

static inline void rxrpc_put_local(struct rxrpc_local *local)
{
	if (local && atomic_dec_and_test(&local->usage))
		__rxrpc_put_local(local);
}

static inline void rxrpc_queue_local(struct rxrpc_local *local)
{
	rxrpc_queue_work(&local->processor);
}

/*
 * misc.c
 */
extern unsigned int rxrpc_max_backlog __read_mostly;
extern unsigned long rxrpc_requested_ack_delay;
extern unsigned long rxrpc_soft_ack_delay;
extern unsigned long rxrpc_idle_ack_delay;
extern unsigned int rxrpc_rx_window_size;
extern unsigned int rxrpc_rx_mtu;
extern unsigned int rxrpc_rx_jumbo_max;
extern unsigned long rxrpc_resend_timeout;

extern const s8 rxrpc_ack_priority[];

/*
 * net_ns.c
 */
extern unsigned int rxrpc_net_id;
extern struct pernet_operations rxrpc_net_ops;

static inline struct rxrpc_net *rxrpc_net(struct net *net)
{
	return net_generic(net, rxrpc_net_id);
}

/*
 * output.c
 */
int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
int rxrpc_send_abort_packet(struct rxrpc_call *);
int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
void rxrpc_reject_packets(struct rxrpc_local *);
void rxrpc_send_keepalive(struct rxrpc_peer *);

/*
 * peer_event.c
 */
void rxrpc_error_report(struct sock *);
void rxrpc_peer_error_distributor(struct work_struct *);
void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
			rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
void rxrpc_peer_keepalive_worker(struct work_struct *);

/*
 * peer_object.c
 */
struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
					 const struct sockaddr_rxrpc *);
struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
				     struct sockaddr_rxrpc *, gfp_t);
struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *,
					      struct rxrpc_peer *);

static inline struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
{
	atomic_inc(&peer->usage);
	return peer;
}

static inline
struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
{
	return atomic_inc_not_zero(&peer->usage) ? peer : NULL;
}

extern void __rxrpc_put_peer(struct rxrpc_peer *peer);
static inline void rxrpc_put_peer(struct rxrpc_peer *peer)
{
	if (peer && atomic_dec_and_test(&peer->usage))
		__rxrpc_put_peer(peer);
}

/*
 * proc.c
 */
extern const struct file_operations rxrpc_call_seq_fops;
extern const struct file_operations rxrpc_connection_seq_fops;

/*
 * recvmsg.c
 */
void rxrpc_notify_socket(struct rxrpc_call *);
int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);

/*
 * rxkad.c
 */
#ifdef CONFIG_RXKAD
extern const struct rxrpc_security rxkad;
#endif

/*
 * security.c
 */
int __init rxrpc_init_security(void);
void rxrpc_exit_security(void);
int rxrpc_init_client_conn_security(struct rxrpc_connection *);
int rxrpc_init_server_conn_security(struct rxrpc_connection *);

/*
 * sendmsg.c
 */
int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);

/*
 * skbuff.c
 */
void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
void rxrpc_packet_destructor(struct sk_buff *);
void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace);
void rxrpc_purge_queue(struct sk_buff_head *);

/*
 * sysctl.c
 */
#ifdef CONFIG_SYSCTL
extern int __init rxrpc_sysctl_init(void);
extern void rxrpc_sysctl_exit(void);
#else
static inline int __init rxrpc_sysctl_init(void) { return 0; }
static inline void rxrpc_sysctl_exit(void) {}
#endif

/*
 * utils.c
 */
int rxrpc_extract_addr_from_skb(struct rxrpc_local *, struct sockaddr_rxrpc *,
				struct sk_buff *);

static inline bool before(u32 seq1, u32 seq2)
{
        return (s32)(seq1 - seq2) < 0;
}
static inline bool before_eq(u32 seq1, u32 seq2)
{
        return (s32)(seq1 - seq2) <= 0;
}
static inline bool after(u32 seq1, u32 seq2)
{
        return (s32)(seq1 - seq2) > 0;
}
static inline bool after_eq(u32 seq1, u32 seq2)
{
        return (s32)(seq1 - seq2) >= 0;
}

/*
 * debug tracing
 */
extern unsigned int rxrpc_debug;

#define dbgprintk(FMT,...) \
	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)

#define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
#define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
#define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
#define kproto(FMT,...)	dbgprintk("### "FMT ,##__VA_ARGS__)
#define knet(FMT,...)	dbgprintk("@@@ "FMT ,##__VA_ARGS__)


#if defined(__KDEBUG)
#define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
#define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
#define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
#define _proto(FMT,...)	kproto(FMT,##__VA_ARGS__)
#define _net(FMT,...)	knet(FMT,##__VA_ARGS__)

#elif defined(CONFIG_AF_RXRPC_DEBUG)
#define RXRPC_DEBUG_KENTER	0x01
#define RXRPC_DEBUG_KLEAVE	0x02
#define RXRPC_DEBUG_KDEBUG	0x04
#define RXRPC_DEBUG_KPROTO	0x08
#define RXRPC_DEBUG_KNET	0x10

#define _enter(FMT,...)					\
do {							\
	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER))	\
		kenter(FMT,##__VA_ARGS__);		\
} while (0)

#define _leave(FMT,...)					\
do {							\
	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE))	\
		kleave(FMT,##__VA_ARGS__);		\
} while (0)

#define _debug(FMT,...)					\
do {							\
	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG))	\
		kdebug(FMT,##__VA_ARGS__);		\
} while (0)

#define _proto(FMT,...)					\
do {							\
	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO))	\
		kproto(FMT,##__VA_ARGS__);		\
} while (0)

#define _net(FMT,...)					\
do {							\
	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))	\
		knet(FMT,##__VA_ARGS__);		\
} while (0)

#else
#define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
#define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
#define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
#define _proto(FMT,...)	no_printk("### "FMT ,##__VA_ARGS__)
#define _net(FMT,...)	no_printk("@@@ "FMT ,##__VA_ARGS__)
#endif

/*
 * debug assertion checking
 */
#if 1 // defined(__KDEBUGALL)

#define ASSERT(X)						\
do {								\
	if (unlikely(!(X))) {					\
		pr_err("Assertion failed\n");			\
		BUG();						\
	}							\
} while (0)

#define ASSERTCMP(X, OP, Y)						\
do {									\
	__typeof__(X) _x = (X);						\
	__typeof__(Y) _y = (__typeof__(X))(Y);				\
	if (unlikely(!(_x OP _y))) {					\
		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
		       (unsigned long)_x, (unsigned long)_x, #OP,	\
		       (unsigned long)_y, (unsigned long)_y);		\
		BUG();							\
	}								\
} while (0)

#define ASSERTIF(C, X)						\
do {								\
	if (unlikely((C) && !(X))) {				\
		pr_err("Assertion failed\n");			\
		BUG();						\
	}							\
} while (0)

#define ASSERTIFCMP(C, X, OP, Y)					\
do {									\
	__typeof__(X) _x = (X);						\
	__typeof__(Y) _y = (__typeof__(X))(Y);				\
	if (unlikely((C) && !(_x OP _y))) {				\
		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
		       (unsigned long)_x, (unsigned long)_x, #OP,	\
		       (unsigned long)_y, (unsigned long)_y);		\
		BUG();							\
	}								\
} while (0)

#else

#define ASSERT(X)				\
do {						\
} while (0)

#define ASSERTCMP(X, OP, Y)			\
do {						\
} while (0)

#define ASSERTIF(C, X)				\
do {						\
} while (0)

#define ASSERTIFCMP(C, X, OP, Y)		\
do {						\
} while (0)

#endif /* __KDEBUGALL */