Bootlin logo

Elixir Cross Referencer

   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
/* 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 in skb->mark.  skb->priority is used
 * to pass supplementary information.
 */
enum rxrpc_skb_mark {
	RXRPC_SKB_MARK_REJECT_BUSY,	/* Reject with BUSY */
	RXRPC_SKB_MARK_REJECT_ABORT,	/* Reject with ABORT (code in skb->priority) */
};

/*
 * 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 */

	atomic_t		nr_conns;
	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;
	time64_t		peer_keepalive_base;
	struct list_head	peer_keepalive[32];
	struct list_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 rb_root		service_conns;	/* Service connections */
	struct list_head	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 */
	struct sockaddr_rxrpc	srx;		/* remote address */

	/* calculated RTT cache */
#define RXRPC_RTT_CACHE_SIZE 32
	spinlock_t		rtt_input_lock;	/* RTT lock for input routine */
	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 */
		unsigned int		call_debug_id;	/* call->debug_id */
		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_sync_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			abort_code;	/* Abort code of connection abort */
	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 */
	u32			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 */
	short			error;		/* Local error code */
};

static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
{
	return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
}

static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
{
	return !rxrpc_to_server(sp);
}

/*
 * 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 */
	RXRPC_CALL_BEGAN_RX_TIMER,	/* We began the expect_rx_by timer */
	RXRPC_CALL_RX_HEARD,		/* The peer responded at least once to this call */
	RXRPC_CALL_RX_UNDERRUN,		/* Got data underrun */
};

/*
 * 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 63
	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. */
	u16			tx_backoff;	/* Delay to insert due to Tx failure */

	/* 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 */
	rxrpc_serial_t		rx_serial;	/* Highest serial received for this call */
	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 */

	spinlock_t		input_lock;	/* Lock for packet input to this call */

	/* 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_sock *,
					   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_sock *, 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 *,
						   struct rxrpc_peer **);
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
 */
int rxrpc_input_packet(struct sock *, struct sk_buff *);

/*
 * 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 *);
struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
void rxrpc_put_local(struct rxrpc_local *);
void rxrpc_queue_local(struct rxrpc_local *);
void rxrpc_destroy_all_locals(struct rxrpc_net *);

/*
 * 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_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_sock *, struct rxrpc_local *,
				     struct sockaddr_rxrpc *, gfp_t);
struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
void rxrpc_new_incoming_peer(struct rxrpc_sock *, struct rxrpc_local *,
			     struct rxrpc_peer *);
void rxrpc_destroy_all_peers(struct rxrpc_net *);
struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
void rxrpc_put_peer(struct rxrpc_peer *);

/*
 * proc.c
 */
extern const struct seq_operations rxrpc_call_seq_ops;
extern const struct seq_operations rxrpc_connection_seq_ops;
extern const struct seq_operations rxrpc_peer_seq_ops;

/*
 * 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_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 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 */