ar-internal.h

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/* AF_RXRPC internal definitions
   3 *
   4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   5 * Written by David Howells (dhowells@redhat.com)
   6 */
   7
   8#include <linux/atomic.h>
   9#include <linux/seqlock.h>
  10#include <linux/win_minmax.h>
  11#include <net/net_namespace.h>
  12#include <net/netns/generic.h>
  13#include <net/sock.h>
  14#include <net/af_rxrpc.h>
  15#include <keys/rxrpc-type.h>
  16#include "protocol.h"
  17
  18#define FCRYPT_BSIZE 8
  19struct rxrpc_crypt {
  20	union {
  21		u8	x[FCRYPT_BSIZE];
  22		__be32	n[2];
  23	};
  24} __attribute__((aligned(8)));
  25
  26#define rxrpc_queue_work(WS)	queue_work(rxrpc_workqueue, (WS))
  27#define rxrpc_queue_delayed_work(WS,D)	\
  28	queue_delayed_work(rxrpc_workqueue, (WS), (D))
  29
  30struct key_preparsed_payload;
  31struct rxrpc_connection;
  32struct rxrpc_txbuf;
  33struct rxrpc_txqueue;
  34struct rxgk_context;
  35
  36/*
  37 * Mark applied to socket buffers in skb->mark.  skb->priority is used
  38 * to pass supplementary information.
  39 */
  40enum rxrpc_skb_mark {
  41	RXRPC_SKB_MARK_PACKET,		/* Received packet */
  42	RXRPC_SKB_MARK_ERROR,		/* Error notification */
  43	RXRPC_SKB_MARK_CHALLENGE,	/* Challenge notification */
  44	RXRPC_SKB_MARK_SERVICE_CONN_SECURED, /* Service connection response has been verified */
  45	RXRPC_SKB_MARK_REJECT_BUSY,	/* Reject with BUSY */
  46	RXRPC_SKB_MARK_REJECT_ABORT,	/* Reject with ABORT (code in skb->priority) */
  47	RXRPC_SKB_MARK_REJECT_CONN_ABORT, /* Reject with connection ABORT (code in skb->priority) */
  48};
  49
  50/*
  51 * sk_state for RxRPC sockets
  52 */
  53enum {
  54	RXRPC_UNBOUND = 0,
  55	RXRPC_CLIENT_UNBOUND,		/* Unbound socket used as client */
  56	RXRPC_CLIENT_BOUND,		/* client local address bound */
  57	RXRPC_SERVER_BOUND,		/* server local address bound */
  58	RXRPC_SERVER_BOUND2,		/* second server local address bound */
  59	RXRPC_SERVER_LISTENING,		/* server listening for connections */
  60	RXRPC_SERVER_LISTEN_DISABLED,	/* server listening disabled */
  61	RXRPC_CLOSE,			/* socket is being closed */
  62};
  63
  64/*
  65 * Per-network namespace data.
  66 */
  67struct rxrpc_net {
  68	struct proc_dir_entry	*proc_net;	/* Subdir in /proc/net */
  69	u32			epoch;		/* Local epoch for detecting local-end reset */
  70	struct list_head	calls;		/* List of calls active in this namespace */
  71	spinlock_t		call_lock;	/* Lock for ->calls */
  72	atomic_t		nr_calls;	/* Count of allocated calls */
  73
  74	atomic_t		nr_conns;
  75	struct list_head	bundle_proc_list; /* List of bundles for proc */
  76	struct list_head	conn_proc_list;	/* List of conns in this namespace for proc */
  77	struct list_head	service_conns;	/* Service conns in this namespace */
  78	rwlock_t		conn_lock;	/* Lock for ->conn_proc_list, ->service_conns */
  79	struct work_struct	service_conn_reaper;
  80	struct timer_list	service_conn_reap_timer;
  81
  82	bool			live;
  83
  84	atomic_t		nr_client_conns;
  85
  86	struct hlist_head	local_endpoints;
  87	struct mutex		local_mutex;	/* Lock for ->local_endpoints */
  88
  89	DECLARE_HASHTABLE	(peer_hash, 10);
  90	spinlock_t		peer_hash_lock;	/* Lock for ->peer_hash */
  91
  92#define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
  93	u8			peer_keepalive_cursor;
  94	time64_t		peer_keepalive_base;
  95	struct list_head	peer_keepalive[32];
  96	struct list_head	peer_keepalive_new;
  97	struct timer_list	peer_keepalive_timer;
  98	struct work_struct	peer_keepalive_work;
  99
 100	atomic_t		stat_tx_data;
 101	atomic_t		stat_tx_data_retrans;
 102	atomic_t		stat_tx_data_send;
 103	atomic_t		stat_tx_data_send_frag;
 104	atomic_t		stat_tx_data_send_fail;
 105	atomic_t		stat_tx_data_send_msgsize;
 106	atomic_t		stat_tx_data_underflow;
 107	atomic_t		stat_tx_data_cwnd_reset;
 108	atomic_t		stat_rx_data;
 109	atomic_t		stat_rx_data_reqack;
 110	atomic_t		stat_rx_data_jumbo;
 111
 112	atomic_t		stat_tx_ack_fill;
 113	atomic_t		stat_tx_ack_send;
 114	atomic_t		stat_tx_ack_skip;
 115	atomic_t		stat_tx_acks[256];
 116	atomic_t		stat_rx_acks[256];
 117	atomic_t		stat_tx_jumbo[10];
 118	atomic_t		stat_rx_jumbo[10];
 119
 120	atomic_t		stat_why_req_ack[9];
 121
 122	atomic_t		stat_io_loop;
 123};
 124
 125/*
 126 * Service backlog preallocation.
 127 *
 128 * This contains circular buffers of preallocated peers, connections and calls
 129 * for incoming service calls and their head and tail pointers.  This allows
 130 * calls to be set up in the data_ready handler, thereby avoiding the need to
 131 * shuffle packets around so much.
 132 */
 133struct rxrpc_backlog {
 134	unsigned short		peer_backlog_head;
 135	unsigned short		peer_backlog_tail;
 136	unsigned short		conn_backlog_head;
 137	unsigned short		conn_backlog_tail;
 138	unsigned short		call_backlog_head;
 139	unsigned short		call_backlog_tail;
 140#define RXRPC_BACKLOG_MAX	32
 141	struct rxrpc_peer	*peer_backlog[RXRPC_BACKLOG_MAX];
 142	struct rxrpc_connection	*conn_backlog[RXRPC_BACKLOG_MAX];
 143	struct rxrpc_call	*call_backlog[RXRPC_BACKLOG_MAX];
 144};
 145
 146/*
 147 * RxRPC socket definition
 148 */
 149struct rxrpc_sock {
 150	/* WARNING: sk has to be the first member */
 151	struct sock		sk;
 152	const struct rxrpc_kernel_ops *app_ops;	/* Table of kernel app notification funcs */
 153	struct rxrpc_local	*local;		/* local endpoint */
 154	struct rxrpc_backlog	*backlog;	/* Preallocation for services */
 155	struct sk_buff_head	recvmsg_oobq;	/* OOB messages for recvmsg to pick up */
 156	struct rb_root		pending_oobq;	/* OOB messages awaiting userspace to respond to */
 157	u64			oob_id_counter;	/* OOB message ID counter */
 158	spinlock_t		incoming_lock;	/* Incoming call vs service shutdown lock */
 159	struct list_head	sock_calls;	/* List of calls owned by this socket */
 160	struct list_head	to_be_accepted;	/* calls awaiting acceptance */
 161	struct list_head	recvmsg_q;	/* Calls awaiting recvmsg's attention  */
 162	spinlock_t		recvmsg_lock;	/* Lock for recvmsg_q */
 163	struct key		*key;		/* security for this socket */
 164	struct key		*securities;	/* list of server security descriptors */
 165	struct rb_root		calls;		/* User ID -> call mapping */
 166	unsigned long		flags;
 167#define RXRPC_SOCK_CONNECTED		0	/* connect_srx is set */
 168#define RXRPC_SOCK_MANAGE_RESPONSE	1	/* User wants to manage RESPONSE packets */
 169	rwlock_t		call_lock;	/* lock for calls */
 170	u32			min_sec_level;	/* minimum security level */
 171#define RXRPC_SECURITY_MAX	RXRPC_SECURITY_ENCRYPT
 172	bool			exclusive;	/* Exclusive connection for a client socket */
 173	u16			second_service;	/* Additional service bound to the endpoint */
 174	struct {
 175		/* Service upgrade information */
 176		u16		from;		/* Service ID to upgrade (if not 0) */
 177		u16		to;		/* service ID to upgrade to */
 178	} service_upgrade;
 179	sa_family_t		family;		/* Protocol family created with */
 180	struct sockaddr_rxrpc	srx;		/* Primary Service/local addresses */
 181	struct sockaddr_rxrpc	connect_srx;	/* Default client address from connect() */
 182};
 183
 184#define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
 185
 186/*
 187 * CPU-byteorder normalised Rx packet header.
 188 */
 189struct rxrpc_host_header {
 190	u32		epoch;		/* client boot timestamp */
 191	u32		cid;		/* connection and channel ID */
 192	u32		callNumber;	/* call ID (0 for connection-level packets) */
 193	u32		seq;		/* sequence number of pkt in call stream */
 194	u32		serial;		/* serial number of pkt sent to network */
 195	u8		type;		/* packet type */
 196	u8		flags;		/* packet flags */
 197	u8		userStatus;	/* app-layer defined status */
 198	u8		securityIndex;	/* security protocol ID */
 199	union {
 200		u16	_rsvd;		/* reserved */
 201		u16	cksum;		/* kerberos security checksum */
 202	};
 203	u16		serviceId;	/* service ID */
 204} __packed;
 205
 206/*
 207 * RxRPC socket buffer private variables
 208 * - max 48 bytes (struct sk_buff::cb)
 209 */
 210struct rxrpc_skb_priv {
 211	union {
 212		struct rxrpc_connection *poke_conn;	/* Conn referred to (poke packet) */
 213		struct {
 214			u16		offset;		/* Offset of data */
 215			u16		len;		/* Length of data */
 216			u8		flags;
 217#define RXRPC_RX_VERIFIED	0x01
 218		};
 219		struct {
 220			rxrpc_seq_t	first_ack;	/* First packet in acks table */
 221			rxrpc_seq_t	prev_ack;	/* Highest seq seen */
 222			rxrpc_serial_t	acked_serial;	/* Packet in response to (or 0) */
 223			u16		nr_acks;	/* Number of acks+nacks */
 224			u8		reason;		/* Reason for ack */
 225		} ack;
 226		struct {
 227			struct rxrpc_connection *conn;	/* Connection referred to */
 228			union {
 229				u32 rxkad_nonce;
 230			};
 231		} chall;
 232		struct {
 233			rxrpc_serial_t	challenge_serial;
 234			u32		kvno;
 235			u32		version;
 236			u16		len;
 237			u16		ticket_len;
 238		} resp;
 239	};
 240	struct rxrpc_host_header hdr;	/* RxRPC packet header from this packet */
 241};
 242
 243#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 244
 245/*
 246 * RxRPC security module interface
 247 */
 248struct rxrpc_security {
 249	const char		*name;		/* name of this service */
 250	u8			security_index;	/* security type provided */
 251	u32			no_key_abort;	/* Abort code indicating no key */
 252
 253	/* Initialise a security service */
 254	int (*init)(void);
 255
 256	/* Clean up a security service */
 257	void (*exit)(void);
 258
 259	/* Parse the information from a server key */
 260	int (*preparse_server_key)(struct key_preparsed_payload *);
 261
 262	/* Clean up the preparse buffer after parsing a server key */
 263	void (*free_preparse_server_key)(struct key_preparsed_payload *);
 264
 265	/* Destroy the payload of a server key */
 266	void (*destroy_server_key)(struct key *);
 267
 268	/* Describe a server key */
 269	void (*describe_server_key)(const struct key *, struct seq_file *);
 270
 271	/* initialise a connection's security */
 272	int (*init_connection_security)(struct rxrpc_connection *,
 273					struct rxrpc_key_token *);
 274
 275	/* Work out how much data we can store in a packet, given an estimate
 276	 * of the amount of data remaining and allocate a data buffer.
 277	 */
 278	struct rxrpc_txbuf *(*alloc_txbuf)(struct rxrpc_call *call, size_t remaining, gfp_t gfp);
 279
 280	/* impose security on a packet */
 281	int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *);
 282
 283	/* verify the security on a received packet */
 284	int (*verify_packet)(struct rxrpc_call *, struct sk_buff *);
 285
 286	/* Free crypto request on a call */
 287	void (*free_call_crypto)(struct rxrpc_call *);
 288
 289	/* issue a challenge */
 290	int (*issue_challenge)(struct rxrpc_connection *);
 291
 292	/* Validate a challenge packet */
 293	bool (*validate_challenge)(struct rxrpc_connection *conn,
 294				   struct sk_buff *skb);
 295
 296	/* Fill out the cmsg for recvmsg() to pass on a challenge to userspace.
 297	 * The security class gets to add additional information.
 298	 */
 299	int (*challenge_to_recvmsg)(struct rxrpc_connection *conn,
 300				    struct sk_buff *challenge,
 301				    struct msghdr *msg);
 302
 303	/* Parse sendmsg() control message and respond to challenge. */
 304	int (*sendmsg_respond_to_challenge)(struct sk_buff *challenge,
 305					    struct msghdr *msg);
 306
 307	/* respond to a challenge */
 308	int (*respond_to_challenge)(struct rxrpc_connection *conn,
 309				    struct sk_buff *challenge);
 310
 311	/* verify a response */
 312	int (*verify_response)(struct rxrpc_connection *,
 313			       struct sk_buff *);
 314
 315	/* clear connection security */
 316	void (*clear)(struct rxrpc_connection *);
 317
 318	/* Default ticket -> key decoder */
 319	int (*default_decode_ticket)(struct rxrpc_connection *conn, struct sk_buff *skb,
 320				     unsigned int ticket_offset, unsigned int ticket_len,
 321				     struct key **_key);
 322};
 323
 324/*
 325 * RxRPC local transport endpoint description
 326 * - owned by a single AF_RXRPC socket
 327 * - pointed to by transport socket struct sk_user_data
 328 */
 329struct rxrpc_local {
 330	struct rcu_head		rcu;
 331	atomic_t		active_users;	/* Number of users of the local endpoint */
 332	refcount_t		ref;		/* Number of references to the structure */
 333	struct net		*net;		/* The network namespace */
 334	struct rxrpc_net	*rxnet;		/* Our bits in the network namespace */
 335	struct hlist_node	link;
 336	struct socket		*socket;	/* my UDP socket */
 337	struct task_struct	*io_thread;
 338	struct completion	io_thread_ready; /* Indication that the I/O thread started */
 339	struct page_frag_cache	tx_alloc;	/* Tx control packet allocation (I/O thread only) */
 340	struct rxrpc_sock	*service;	/* Service(s) listening on this endpoint */
 341#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
 342	struct sk_buff_head	rx_delay_queue;	/* Delay injection queue */
 343#endif
 344	struct sk_buff_head	rx_queue;	/* Received packets */
 345	struct list_head	conn_attend_q;	/* Conns requiring immediate attention */
 346	struct list_head	call_attend_q;	/* Calls requiring immediate attention */
 347
 348	struct rb_root		client_bundles;	/* Client connection bundles by socket params */
 349	spinlock_t		client_bundles_lock; /* Lock for client_bundles */
 350	bool			kill_all_client_conns;
 351	struct list_head	idle_client_conns;
 352	struct timer_list	client_conn_reap_timer;
 353	unsigned long		client_conn_flags;
 354#define RXRPC_CLIENT_CONN_REAP_TIMER	0	/* The client conn reap timer expired */
 355
 356	spinlock_t		lock;		/* access lock */
 357	rwlock_t		services_lock;	/* lock for services list */
 358	int			debug_id;	/* debug ID for printks */
 359	bool			dead;
 360	bool			service_closed;	/* Service socket closed */
 361	struct idr		conn_ids;	/* List of connection IDs */
 362	struct list_head	new_client_calls; /* Newly created client calls need connection */
 363	spinlock_t		client_call_lock; /* Lock for ->new_client_calls */
 364	struct sockaddr_rxrpc	srx;		/* local address */
 365	union {
 366		/* Provide a kvec table sufficiently large to manage either a
 367		 * DATA packet with a maximum set of jumbo subpackets or a PING
 368		 * ACK padded out to 64K with zeropages for PMTUD.
 369		 */
 370		struct kvec		kvec[1 + RXRPC_MAX_NR_JUMBO > 3 + 16 ?
 371					     1 + RXRPC_MAX_NR_JUMBO : 3 + 16];
 372		struct bio_vec		bvec[3 + 16];
 373	};
 374};
 375
 376/*
 377 * RxRPC remote transport endpoint definition
 378 * - matched by local endpoint, remote port, address and protocol type
 379 */
 380struct rxrpc_peer {
 381	struct rcu_head		rcu;		/* This must be first */
 382	refcount_t		ref;
 383	unsigned long		hash_key;
 384	struct hlist_node	hash_link;
 385	struct rxrpc_local	*local;
 386	struct hlist_head	error_targets;	/* targets for net error distribution */
 387	struct rb_root		service_conns;	/* Service connections */
 388	struct list_head	keepalive_link;	/* Link in net->peer_keepalive[] */
 389	unsigned long		app_data;	/* Application data (e.g. afs_server) */
 390	unsigned int		last_tx_at;	/* Last time packet sent here (time64_t LSW) */
 391	seqlock_t		service_conn_lock;
 392	spinlock_t		lock;		/* access lock */
 393	int			debug_id;	/* debug ID for printks */
 394	struct sockaddr_rxrpc	srx;		/* remote address */
 395
 396	/* Path MTU discovery [RFC8899] */
 397	unsigned int		pmtud_trial;	/* Current MTU probe size */
 398	unsigned int		pmtud_good;	/* Largest working MTU probe we've tried */
 399	unsigned int		pmtud_bad;	/* Smallest non-working MTU probe we've tried */
 400	bool			pmtud_lost;	/* T if MTU probe was lost */
 401	bool			pmtud_probing;	/* T if we have an active probe outstanding */
 402	bool			pmtud_pending;	/* T if a call to this peer should send a probe */
 403	u8			pmtud_jumbo;	/* Max jumbo packets for the MTU */
 404	bool			ackr_adv_pmtud;	/* T if the peer advertises path-MTU */
 405	unsigned int		ackr_max_data;	/* Maximum data advertised by peer */
 406	unsigned int		if_mtu;		/* Local interface MTU (- hdrsize) for this peer */
 407	unsigned int		max_data;	/* Maximum packet data capacity for this peer */
 408	unsigned short		hdrsize;	/* header size (IP + UDP + RxRPC) */
 409	unsigned short		tx_seg_max;	/* Maximum number of transmissable segments */
 410
 411	/* Calculated RTT cache */
 412	unsigned int		recent_srtt_us;
 413	unsigned int		recent_rto_us;
 414
 415	u8			cong_ssthresh;	/* Congestion slow-start threshold */
 416};
 417
 418/*
 419 * Keys for matching a connection.
 420 */
 421struct rxrpc_conn_proto {
 422	union {
 423		struct {
 424			u32	epoch;		/* epoch of this connection */
 425			u32	cid;		/* connection ID */
 426		};
 427		u64		index_key;
 428	};
 429};
 430
 431struct rxrpc_conn_parameters {
 432	struct rxrpc_local	*local;		/* Representation of local endpoint */
 433	struct rxrpc_peer	*peer;		/* Representation of remote endpoint */
 434	struct key		*key;		/* Security details */
 435	bool			exclusive;	/* T if conn is exclusive */
 436	bool			upgrade;	/* T if service ID can be upgraded */
 437	u16			service_id;	/* Service ID for this connection */
 438	u32			security_level;	/* Security level selected */
 439};
 440
 441/*
 442 * Call completion condition (state == RXRPC_CALL_COMPLETE).
 443 */
 444enum rxrpc_call_completion {
 445	RXRPC_CALL_SUCCEEDED,		/* - Normal termination */
 446	RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
 447	RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
 448	RXRPC_CALL_LOCAL_ERROR,		/* - call failed due to local error */
 449	RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
 450	NR__RXRPC_CALL_COMPLETIONS
 451};
 452
 453/*
 454 * Bits in the connection flags.
 455 */
 456enum rxrpc_conn_flag {
 457	RXRPC_CONN_IN_SERVICE_CONNS,	/* Conn is in peer->service_conns */
 458	RXRPC_CONN_DONT_REUSE,		/* Don't reuse this connection */
 459	RXRPC_CONN_PROBING_FOR_UPGRADE,	/* Probing for service upgrade */
 460	RXRPC_CONN_FINAL_ACK_0,		/* Need final ACK for channel 0 */
 461	RXRPC_CONN_FINAL_ACK_1,		/* Need final ACK for channel 1 */
 462	RXRPC_CONN_FINAL_ACK_2,		/* Need final ACK for channel 2 */
 463	RXRPC_CONN_FINAL_ACK_3,		/* Need final ACK for channel 3 */
 464};
 465
 466#define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |	\
 467				   (1UL << RXRPC_CONN_FINAL_ACK_1) |	\
 468				   (1UL << RXRPC_CONN_FINAL_ACK_2) |	\
 469				   (1UL << RXRPC_CONN_FINAL_ACK_3))
 470
 471/*
 472 * Events that can be raised upon a connection.
 473 */
 474enum rxrpc_conn_event {
 475	RXRPC_CONN_EV_CHALLENGE,	/* Send challenge packet */
 476	RXRPC_CONN_EV_ABORT_CALLS,	/* Abort attached calls */
 477};
 478
 479/*
 480 * The connection protocol state.
 481 */
 482enum rxrpc_conn_proto_state {
 483	RXRPC_CONN_UNUSED,		/* Connection not yet attempted */
 484	RXRPC_CONN_CLIENT_UNSECURED,	/* Client connection needs security init */
 485	RXRPC_CONN_CLIENT,		/* Client connection */
 486	RXRPC_CONN_SERVICE_PREALLOC,	/* Service connection preallocation */
 487	RXRPC_CONN_SERVICE_UNSECURED,	/* Service unsecured connection */
 488	RXRPC_CONN_SERVICE_CHALLENGING,	/* Service challenging for security */
 489	RXRPC_CONN_SERVICE,		/* Service secured connection */
 490	RXRPC_CONN_ABORTED,		/* Conn aborted */
 491	RXRPC_CONN__NR_STATES
 492};
 493
 494/*
 495 * RxRPC client connection bundle.
 496 */
 497struct rxrpc_bundle {
 498	struct rxrpc_local	*local;		/* Representation of local endpoint */
 499	struct rxrpc_peer	*peer;		/* Remote endpoint */
 500	struct key		*key;		/* Security details */
 501	struct list_head	proc_link;	/* Link in net->bundle_proc_list */
 502	const struct rxrpc_security *security;	/* applied security module */
 503	refcount_t		ref;
 504	atomic_t		active;		/* Number of active users */
 505	unsigned int		debug_id;
 506	u32			security_level;	/* Security level selected */
 507	u16			service_id;	/* Service ID for this connection */
 508	bool			try_upgrade;	/* True if the bundle is attempting upgrade */
 509	bool			exclusive;	/* T if conn is exclusive */
 510	bool			upgrade;	/* T if service ID can be upgraded */
 511	unsigned short		alloc_error;	/* Error from last conn allocation */
 512	struct rb_node		local_node;	/* Node in local->client_conns */
 513	struct list_head	waiting_calls;	/* Calls waiting for channels */
 514	unsigned long		avail_chans;	/* Mask of available channels */
 515	unsigned int		conn_ids[4];	/* Connection IDs. */
 516	struct rxrpc_connection	*conns[4];	/* The connections in the bundle (max 4) */
 517};
 518
 519/*
 520 * RxRPC connection definition
 521 * - matched by { local, peer, epoch, conn_id, direction }
 522 * - each connection can only handle four simultaneous calls
 523 */
 524struct rxrpc_connection {
 525	struct rxrpc_conn_proto	proto;
 526	struct rxrpc_local	*local;		/* Representation of local endpoint */
 527	struct rxrpc_peer	*peer;		/* Remote endpoint */
 528	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
 529	struct key		*key;		/* Security details */
 530	struct list_head	attend_link;	/* Link in local->conn_attend_q */
 531
 532	refcount_t		ref;
 533	atomic_t		active;		/* Active count for service conns */
 534	struct rcu_head		rcu;
 535	struct list_head	cache_link;
 536
 537	unsigned char		act_chans;	/* Mask of active channels */
 538	struct rxrpc_channel {
 539		unsigned long		final_ack_at;	/* Time at which to issue final ACK */
 540		struct rxrpc_call	*call;		/* Active call */
 541		unsigned int		call_debug_id;	/* call->debug_id */
 542		u32			call_id;	/* ID of current call */
 543		u32			call_counter;	/* Call ID counter */
 544		u32			last_call;	/* ID of last call */
 545		u8			last_type;	/* Type of last packet */
 546		union {
 547			u32		last_seq;
 548			u32		last_abort;
 549		};
 550	} channels[RXRPC_MAXCALLS];
 551
 552	struct timer_list	timer;		/* Conn event timer */
 553	struct work_struct	processor;	/* connection event processor */
 554	struct work_struct	destructor;	/* In-process-context destroyer */
 555	struct rxrpc_bundle	*bundle;	/* Client connection bundle */
 556	struct rb_node		service_node;	/* Node in peer->service_conns */
 557	struct list_head	proc_link;	/* link in procfs list */
 558	struct list_head	link;		/* link in master connection list */
 559	struct sk_buff_head	rx_queue;	/* received conn-level packets */
 560	struct page_frag_cache	tx_data_alloc;	/* Tx DATA packet allocation */
 561	struct mutex		tx_data_alloc_lock;
 562
 563	struct mutex		security_lock;	/* Lock for security management */
 564	const struct rxrpc_security *security;	/* applied security module */
 565	union {
 566		struct {
 567			struct crypto_sync_skcipher *cipher;	/* encryption handle */
 568			struct rxrpc_crypt csum_iv;	/* packet checksum base */
 569			u32	nonce;		/* response re-use preventer */
 570		} rxkad;
 571		struct {
 572			struct rxgk_context *keys[4]; /* (Re-)keying buffer */
 573			u64	start_time;	/* The start time for TK derivation */
 574			u8	nonce[20];	/* Response re-use preventer */
 575			u32	enctype;	/* Kerberos 5 encoding type */
 576			u32	key_number;	/* Current key number */
 577		} rxgk;
 578	};
 579	rwlock_t		security_use_lock; /* Security use/modification lock */
 580	struct sk_buff		*tx_response;	/* Response packet to be transmitted */
 581
 582	unsigned long		flags;
 583	unsigned long		events;
 584	unsigned long		idle_timestamp;	/* Time at which last became idle */
 585	spinlock_t		state_lock;	/* state-change lock */
 586	enum rxrpc_conn_proto_state state;	/* current state of connection */
 587	enum rxrpc_call_completion completion;	/* Completion condition */
 588	s32			abort_code;	/* Abort code of connection abort */
 589	int			debug_id;	/* debug ID for printks */
 590	rxrpc_serial_t		tx_serial;	/* Outgoing packet serial number counter */
 591	unsigned int		hi_serial;	/* highest serial number received */
 592	rxrpc_serial_t		pmtud_probe;	/* Serial of MTU probe (or 0) */
 593	unsigned int		pmtud_call;	/* ID of call used for probe */
 594	u32			service_id;	/* Service ID, possibly upgraded */
 595	u32			security_level;	/* Security level selected */
 596	u8			security_ix;	/* security type */
 597	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
 598	u8			bundle_shift;	/* Index into bundle->avail_chans */
 599	bool			exclusive;	/* T if conn is exclusive */
 600	bool			upgrade;	/* T if service ID can be upgraded */
 601	u16			orig_service_id; /* Originally requested service ID */
 602	short			error;		/* Local error code */
 603};
 604
 605static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
 606{
 607	return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
 608}
 609
 610static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
 611{
 612	return !rxrpc_to_server(sp);
 613}
 614
 615/*
 616 * Flags in call->flags.
 617 */
 618enum rxrpc_call_flag {
 619	RXRPC_CALL_RELEASED,		/* call has been released - no more message to userspace */
 620	RXRPC_CALL_HAS_USERID,		/* has a user ID attached */
 621	RXRPC_CALL_IS_SERVICE,		/* Call is service call */
 622	RXRPC_CALL_EXPOSED,		/* The call was exposed to the world */
 623	RXRPC_CALL_RX_LAST,		/* Received the last packet (at rxtx_top) */
 624	RXRPC_CALL_TX_LAST,		/* Last packet in Tx buffer (at rxtx_top) */
 625	RXRPC_CALL_TX_ALL_ACKED,	/* Last packet has been hard-acked */
 626	RXRPC_CALL_TX_NO_MORE,		/* No more data to transmit (MSG_MORE deasserted) */
 627	RXRPC_CALL_SEND_PING,		/* A ping will need to be sent */
 628	RXRPC_CALL_RETRANS_TIMEOUT,	/* Retransmission due to timeout occurred */
 629	RXRPC_CALL_BEGAN_RX_TIMER,	/* We began the expect_rx_by timer */
 630	RXRPC_CALL_RX_HEARD,		/* The peer responded at least once to this call */
 631	RXRPC_CALL_DISCONNECTED,	/* The call has been disconnected */
 632	RXRPC_CALL_KERNEL,		/* The call was made by the kernel */
 633	RXRPC_CALL_UPGRADE,		/* Service upgrade was requested for the call */
 634	RXRPC_CALL_EXCLUSIVE,		/* The call uses a once-only connection */
 635	RXRPC_CALL_RX_IS_IDLE,		/* recvmsg() is idle - send an ACK */
 636	RXRPC_CALL_RECVMSG_READ_ALL,	/* recvmsg() read all of the received data */
 637	RXRPC_CALL_CONN_CHALLENGING,	/* The connection is being challenged */
 638};
 639
 640/*
 641 * Events that can be raised on a call.
 642 */
 643enum rxrpc_call_event {
 644	RXRPC_CALL_EV_ACK_LOST,		/* ACK may be lost, send ping */
 645	RXRPC_CALL_EV_INITIAL_PING,	/* Send initial ping for a new service call */
 646};
 647
 648/*
 649 * The states that a call can be in.
 650 */
 651enum rxrpc_call_state {
 652	RXRPC_CALL_UNINITIALISED,
 653	RXRPC_CALL_CLIENT_AWAIT_CONN,	/* - client waiting for connection to become available */
 654	RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
 655	RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
 656	RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
 657	RXRPC_CALL_SERVER_PREALLOC,	/* - service preallocation */
 658	RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
 659	RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
 660	RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
 661	RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
 662	RXRPC_CALL_COMPLETE,		/* - call complete */
 663	NR__RXRPC_CALL_STATES
 664};
 665
 666/*
 667 * Call Tx congestion management modes.
 668 */
 669enum rxrpc_ca_state {
 670	RXRPC_CA_SLOW_START,
 671	RXRPC_CA_CONGEST_AVOIDANCE,
 672	RXRPC_CA_PACKET_LOSS,
 673	RXRPC_CA_FAST_RETRANSMIT,
 674	NR__RXRPC_CA_STATES
 675} __mode(byte);
 676
 677/*
 678 * Current purpose of call RACK timer.  According to the RACK-TLP protocol
 679 * [RFC8985], the transmission timer (call->rack_timo_at) may only be used for
 680 * one of these at once.
 681 */
 682enum rxrpc_rack_timer_mode {
 683	RXRPC_CALL_RACKTIMER_OFF,		/* Timer not running */
 684	RXRPC_CALL_RACKTIMER_RACK_REORDER,	/* RACK reordering timer */
 685	RXRPC_CALL_RACKTIMER_TLP_PTO,		/* TLP timeout */
 686	RXRPC_CALL_RACKTIMER_RTO,		/* Retransmission timeout */
 687} __mode(byte);
 688
 689/*
 690 * RxRPC call definition
 691 * - matched by { connection, call_id }
 692 */
 693struct rxrpc_call {
 694	struct rcu_head		rcu;
 695	struct rxrpc_connection	*conn;		/* connection carrying call */
 696	struct rxrpc_bundle	*bundle;	/* Connection bundle to use */
 697	struct rxrpc_peer	*peer;		/* Peer record for remote address */
 698	struct rxrpc_local	*local;		/* Representation of local endpoint */
 699	struct rxrpc_sock __rcu	*socket;	/* socket responsible */
 700	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
 701	struct key		*key;		/* Security details */
 702	const struct rxrpc_security *security;	/* applied security module */
 703	struct mutex		user_mutex;	/* User access mutex */
 704	struct sockaddr_rxrpc	dest_srx;	/* Destination address */
 705	ktime_t			delay_ack_at;	/* When DELAY ACK needs to happen */
 706	ktime_t			rack_timo_at;	/* When ACK is figured as lost */
 707	ktime_t			ping_at;	/* When next to send a ping */
 708	ktime_t			keepalive_at;	/* When next to send a keepalive ping */
 709	ktime_t			expect_rx_by;	/* When we expect to get a packet by */
 710	ktime_t			expect_req_by;	/* When we expect to get a request DATA packet by */
 711	ktime_t			expect_term_by;	/* When we expect call termination by */
 712	u32			next_rx_timo;	/* Timeout for next Rx packet (ms) */
 713	u32			next_req_timo;	/* Timeout for next Rx request packet (ms) */
 714	u32			hard_timo;	/* Maximum lifetime or 0 (s) */
 715	struct timer_list	timer;		/* Combined event timer */
 716	struct work_struct	destroyer;	/* In-process-context destroyer */
 717	rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
 718	struct list_head	link;		/* link in master call list */
 719	struct list_head	wait_link;	/* Link in local->new_client_calls */
 720	struct hlist_node	error_link;	/* link in error distribution list */
 721	struct list_head	accept_link;	/* Link in rx->acceptq */
 722	struct list_head	recvmsg_link;	/* Link in rx->recvmsg_q */
 723	struct list_head	sock_link;	/* Link in rx->sock_calls */
 724	struct rb_node		sock_node;	/* Node in rx->calls */
 725	struct list_head	attend_link;	/* Link in local->call_attend_q */
 726	struct rxrpc_txbuf	*tx_pending;	/* Tx buffer being filled */
 727	wait_queue_head_t	waitq;		/* Wait queue for channel or Tx */
 728	s64			tx_total_len;	/* Total length left to be transmitted (or -1) */
 729	unsigned long		user_call_ID;	/* user-defined call ID */
 730	unsigned long		flags;
 731	unsigned long		events;
 732	spinlock_t		notify_lock;	/* Kernel notification lock */
 733	unsigned int		send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */
 734	s32			send_abort;	/* Abort code to be sent */
 735	short			send_abort_err;	/* Error to be associated with the abort */
 736	rxrpc_seq_t		send_abort_seq;	/* DATA packet that incurred the abort (or 0) */
 737	s32			abort_code;	/* Local/remote abort code */
 738	int			error;		/* Local error incurred */
 739	enum rxrpc_call_state	_state;		/* Current state of call (needs barrier) */
 740	enum rxrpc_call_completion completion;	/* Call completion condition */
 741	refcount_t		ref;
 742	u8			security_ix;	/* Security type */
 743	enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */
 744	u32			call_id;	/* call ID on connection  */
 745	u32			cid;		/* connection ID plus channel index */
 746	u32			security_level;	/* Security level selected */
 747	u32			security_enctype; /* Security-specific encoding type (or 0) */
 748	int			debug_id;	/* debug ID for printks */
 749	unsigned short		rx_pkt_offset;	/* Current recvmsg packet offset */
 750	unsigned short		rx_pkt_len;	/* Current recvmsg packet len */
 751
 752	/* Sendmsg data tracking. */
 753	rxrpc_seq_t		send_top;	/* Highest Tx slot filled by sendmsg. */
 754	struct rxrpc_txqueue	*send_queue;	/* Queue that sendmsg is writing into */
 755
 756	/* Transmitted data tracking. */
 757	struct rxrpc_txqueue	*tx_queue;	/* Start of transmission buffers */
 758	struct rxrpc_txqueue	*tx_qtail;	/* End of transmission buffers */
 759	rxrpc_seq_t		tx_qbase;	/* First slot in tx_queue */
 760	rxrpc_seq_t		tx_bottom;	/* First packet in buffer */
 761	rxrpc_seq_t		tx_transmitted;	/* Highest packet transmitted */
 762	rxrpc_seq_t		tx_top;		/* Highest Tx slot allocated. */
 763	rxrpc_serial_t		tx_last_serial;	/* Serial of last DATA transmitted */
 764	u16			tx_backoff;	/* Delay to insert due to Tx failure (ms) */
 765	u16			tx_nr_sent;	/* Number of packets sent, but unacked */
 766	u16			tx_nr_lost;	/* Number of packets marked lost */
 767	u16			tx_nr_resent;	/* Number of packets resent, but unacked */
 768	u16			tx_winsize;	/* Maximum size of Tx window */
 769#define RXRPC_TX_MAX_WINDOW	128
 770	u8			tx_jumbo_max;	/* Maximum subpkts peer will accept */
 771	ktime_t			tx_last_sent;	/* Last time a transmission occurred */
 772
 773	/* Received data tracking */
 774	struct sk_buff_head	recvmsg_queue;	/* Queue of packets ready for recvmsg() */
 775	struct sk_buff_head	rx_queue;	/* Queue of packets for this call to receive */
 776	struct sk_buff_head	rx_oos_queue;	/* Queue of out of sequence packets */
 777
 778	rxrpc_seq_t		rx_highest_seq;	/* Higest sequence number received */
 779	rxrpc_seq_t		rx_consumed;	/* Highest packet consumed */
 780	rxrpc_serial_t		rx_serial;	/* Highest serial received for this call */
 781	u8			rx_winsize;	/* Size of Rx window */
 782
 783	/* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 784	 * is fixed, we keep these numbers in terms of segments (ie. DATA
 785	 * packets) rather than bytes.
 786	 */
 787#define RXRPC_TX_SMSS		RXRPC_JUMBO_DATALEN
 788#define RXRPC_MIN_CWND		4
 789	enum rxrpc_ca_state	cong_ca_state;	/* Congestion control state */
 790	u8			cong_extra;	/* Extra to send for congestion management */
 791	u16			cong_cwnd;	/* Congestion window size */
 792	u16			cong_ssthresh;	/* Slow-start threshold */
 793	u16			cong_dup_acks;	/* Count of ACKs showing missing packets */
 794	u16			cong_cumul_acks; /* Cumulative ACK count */
 795	ktime_t			cong_tstamp;	/* Last time cwnd was changed */
 796
 797	/* RACK-TLP [RFC8985] state. */
 798	ktime_t			rack_xmit_ts;	/* Latest transmission timestamp */
 799	ktime_t			rack_rtt;	/* RTT of most recently ACK'd segment */
 800	ktime_t			rack_rtt_ts;	/* Timestamp of rack_rtt */
 801	ktime_t			rack_reo_wnd;	/* Reordering window */
 802	unsigned int		rack_reo_wnd_mult; /* Multiplier applied to rack_reo_wnd */
 803	int			rack_reo_wnd_persist; /* Num loss recoveries before reset reo_wnd */
 804	rxrpc_seq_t		rack_fack;	/* Highest sequence so far ACK'd */
 805	rxrpc_seq_t		rack_end_seq;	/* Highest sequence seen */
 806	rxrpc_seq_t		rack_dsack_round; /* DSACK opt recv'd in latest roundtrip */
 807	bool			rack_dsack_round_none; /* T if dsack_round is "None" */
 808	bool			rack_reordering_seen; /* T if detected reordering event */
 809	enum rxrpc_rack_timer_mode rack_timer_mode; /* Current mode of RACK timer */
 810	bool			tlp_is_retrans;	/* T if unacked TLP retransmission */
 811	rxrpc_serial_t		tlp_serial;	/* Serial of TLP probe (or 0 if none in progress) */
 812	rxrpc_seq_t		tlp_seq;	/* Sequence of TLP probe */
 813	unsigned int		tlp_rtt_taken;	/* Last time RTT taken */
 814	ktime_t			tlp_max_ack_delay; /* Sender budget for max delayed ACK interval */
 815
 816	/* Receive-phase ACK management (ACKs we send). */
 817	u8			ackr_reason;	/* reason to ACK */
 818	u16			ackr_sack_base;	/* Starting slot in SACK table ring */
 819	rxrpc_seq_t		ackr_window;	/* Base of SACK window */
 820	rxrpc_seq_t		ackr_wtop;	/* Base of SACK window */
 821	unsigned int		ackr_nr_unacked; /* Number of unacked packets */
 822	atomic_t		ackr_nr_consumed; /* Number of packets needing hard ACK */
 823	struct {
 824#define RXRPC_SACK_SIZE 256
 825		 /* SACK table for soft-acked packets */
 826		u8		ackr_sack_table[RXRPC_SACK_SIZE];
 827	} __aligned(8);
 828
 829	/* RTT management */
 830	rxrpc_serial_t		rtt_serial[4];	/* Serial number of DATA or PING sent */
 831	ktime_t			rtt_sent_at[4];	/* Time packet sent */
 832	unsigned long		rtt_avail;	/* Mask of available slots in bits 0-3,
 833						 * Mask of pending samples in 8-11 */
 834#define RXRPC_CALL_RTT_AVAIL_MASK	0xf
 835#define RXRPC_CALL_RTT_PEND_SHIFT	8
 836
 837	/* Transmission-phase ACK management (ACKs we've received). */
 838	ktime_t			acks_latest_ts;	/* Timestamp of latest ACK received */
 839	rxrpc_seq_t		acks_hard_ack;	/* Highest sequence hard acked */
 840	rxrpc_seq_t		acks_prev_seq;	/* Highest previousPacket received */
 841	rxrpc_seq_t		acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 842	rxrpc_serial_t		acks_highest_serial; /* Highest serial number ACK'd */
 843	unsigned short		acks_nr_sacks;	/* Number of soft acks recorded */
 844	unsigned short		acks_nr_snacks;	/* Number of soft nacks recorded */
 845
 846	/* Calculated RTT cache */
 847	ktime_t			rtt_last_req;	/* Time of last RTT request */
 848	unsigned int		rtt_count;	/* Number of samples we've got */
 849	unsigned int		rtt_taken;	/* Number of samples taken (wrapping) */
 850	struct minmax		min_rtt;	/* Estimated minimum RTT */
 851	u32			srtt_us;	/* smoothed round trip time << 3 in usecs */
 852	u32			mdev_us;	/* medium deviation			*/
 853	u32			mdev_max_us;	/* maximal mdev for the last rtt period	*/
 854	u32			rttvar_us;	/* smoothed mdev_max			*/
 855	u32			rto_us;		/* Retransmission timeout in usec */
 856	u8			backoff;	/* Backoff timeout (as shift) */
 857};
 858
 859/*
 860 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 861 */
 862struct rxrpc_ack_summary {
 863	rxrpc_serial_t	ack_serial;		/* Serial number of ACK */
 864	rxrpc_serial_t	acked_serial;		/* Serial number ACK'd */
 865	u16		in_flight;		/* Number of unreceived transmissions */
 866	u16		nr_new_hacks;		/* Number of rotated new ACKs */
 867	u16		nr_new_sacks;		/* Number of new soft ACKs in packet */
 868	u16		nr_new_snacks;		/* Number of new soft nacks in packet */
 869	u8		ack_reason;
 870	bool		new_low_snack:1;	/* T if new low soft NACK found */
 871	bool		retrans_timeo:1;	/* T if reTx due to timeout happened */
 872	bool		need_retransmit:1;	/* T if we need transmission */
 873	bool		rtt_sample_avail:1;	/* T if RTT sample available */
 874	bool		in_fast_or_rto_recovery:1;
 875	bool		exiting_fast_or_rto_recovery:1;
 876	bool		tlp_probe_acked:1;	/* T if the TLP probe seq was acked */
 877	u8 /*enum rxrpc_congest_change*/ change;
 878};
 879
 880/*
 881 * sendmsg() cmsg-specified parameters.
 882 */
 883enum rxrpc_command {
 884	RXRPC_CMD_SEND_DATA,		/* send data message */
 885	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
 886	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
 887	RXRPC_CMD_CHARGE_ACCEPT,	/* [server] charge accept preallocation */
 888};
 889
 890struct rxrpc_call_params {
 891	s64			tx_total_len;	/* Total Tx data length (if send data) */
 892	unsigned long		user_call_ID;	/* User's call ID */
 893	struct {
 894		u32		hard;		/* Maximum lifetime (sec) */
 895		u32		idle;		/* Max time since last data packet (msec) */
 896		u32		normal;		/* Max time since last call packet (msec) */
 897	} timeouts;
 898	u8			nr_timeouts;	/* Number of timeouts specified */
 899	bool			kernel;		/* T if kernel is making the call */
 900	enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */
 901};
 902
 903struct rxrpc_send_params {
 904	struct rxrpc_call_params call;
 905	u32			abort_code;	/* Abort code to Tx (if abort) */
 906	enum rxrpc_command	command : 8;	/* The command to implement */
 907	bool			exclusive;	/* Shared or exclusive call */
 908	bool			upgrade;	/* If the connection is upgradeable */
 909};
 910
 911/*
 912 * Buffer of data to be output as a packet.
 913 */
 914struct rxrpc_txbuf {
 915	refcount_t		ref;
 916	rxrpc_seq_t		seq;		/* Sequence number of this packet */
 917	rxrpc_serial_t		serial;		/* Last serial number transmitted with */
 918	unsigned int		call_debug_id;
 919	unsigned int		debug_id;
 920	unsigned short		len;		/* Amount of data in buffer */
 921	unsigned short		space;		/* Remaining data space */
 922	unsigned short		offset;		/* Offset of fill point */
 923	unsigned short		crypto_header;	/* Size of crypto header */
 924	unsigned short		sec_header;	/* Size of security header */
 925	unsigned short		pkt_len;	/* Size of packet content */
 926	unsigned short		alloc_size;	/* Amount of bufferage allocated */
 927	unsigned int		flags;
 928#define RXRPC_TXBUF_WIRE_FLAGS	0xff		/* The wire protocol flags */
 929#define RXRPC_TXBUF_RESENT	0x100		/* Set if has been resent */
 930	__be16			cksum;		/* Checksum to go in header */
 931	bool			jumboable;	/* Can be non-terminal jumbo subpacket */
 932	void			*data;		/* Data with preceding jumbo header */
 933};
 934
 935static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb)
 936{
 937	return txb->flags & RXRPC_CLIENT_INITIATED;
 938}
 939
 940static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb)
 941{
 942	return !rxrpc_sending_to_server(txb);
 943}
 944
 945/*
 946 * Transmit queue element, including RACK [RFC8985] per-segment metadata.  The
 947 * transmission timestamp is in usec from the base.
 948 */
 949struct rxrpc_txqueue {
 950	/* Start with the members we want to prefetch. */
 951	struct rxrpc_txqueue	*next;
 952	ktime_t			xmit_ts_base;
 953	rxrpc_seq_t		qbase;
 954	u8			nr_reported_acks; /* Number of segments explicitly acked/nacked */
 955	unsigned long		segment_acked;	/* Bit-per-buf: Set if ACK'd */
 956	unsigned long		segment_lost;	/* Bit-per-buf: Set if declared lost */
 957	unsigned long		segment_retransmitted; /* Bit-per-buf: Set if retransmitted */
 958	unsigned long		rtt_samples;	/* Bit-per-buf: Set if available for RTT */
 959	unsigned long		ever_retransmitted; /* Bit-per-buf: Set if ever retransmitted */
 960
 961	/* The arrays we want to pack into as few cache lines as possible. */
 962	struct {
 963#define RXRPC_NR_TXQUEUE BITS_PER_LONG
 964#define RXRPC_TXQ_MASK (RXRPC_NR_TXQUEUE - 1)
 965		struct rxrpc_txbuf *bufs[RXRPC_NR_TXQUEUE];
 966		unsigned int	segment_serial[RXRPC_NR_TXQUEUE];
 967		unsigned int	segment_xmit_ts[RXRPC_NR_TXQUEUE];
 968	} ____cacheline_aligned;
 969};
 970
 971/*
 972 * Data transmission request.
 973 */
 974struct rxrpc_send_data_req {
 975	ktime_t			now;		/* Current time */
 976	struct rxrpc_txqueue	*tq;		/* Tx queue segment holding first DATA */
 977	rxrpc_seq_t		seq;		/* Sequence of first data */
 978	int			n;		/* Number of DATA packets to glue into jumbo */
 979	bool			retrans;	/* T if this is a retransmission */
 980	bool			did_send;	/* T if did actually send */
 981	bool			tlp_probe;	/* T if this is a TLP probe */
 982	int /* enum rxrpc_txdata_trace */ trace;
 983};
 984
 985#include <trace/events/rxrpc.h>
 986
 987/*
 988 * Allocate the next serial number on a connection.  0 must be skipped.
 989 */
 990static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn)
 991{
 992	rxrpc_serial_t serial;
 993
 994	serial = conn->tx_serial;
 995	if (serial == 0)
 996		serial = 1;
 997	conn->tx_serial = serial + 1;
 998	return serial;
 999}
1000
1001/*
1002 * Allocate the next serial n numbers on a connection.  0 must be skipped.
1003 */
1004static inline rxrpc_serial_t rxrpc_get_next_serials(struct rxrpc_connection *conn,
1005						    unsigned int n)
1006{
1007	rxrpc_serial_t serial;
1008
1009	serial = conn->tx_serial;
1010	if (serial + n <= n)
1011		serial = 1;
1012	conn->tx_serial = serial + n;
1013	return serial;
1014}
1015
1016/*
1017 * af_rxrpc.c
1018 */
1019extern atomic_t rxrpc_n_rx_skbs;
1020extern struct workqueue_struct *rxrpc_workqueue;
1021
1022/*
1023 * call_accept.c
1024 */
1025int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
1026void rxrpc_discard_prealloc(struct rxrpc_sock *);
1027bool rxrpc_new_incoming_call(struct rxrpc_local *local,
1028			     struct rxrpc_peer *peer,
1029			     struct rxrpc_connection *conn,
1030			     struct sockaddr_rxrpc *peer_srx,
1031			     struct sk_buff *skb);
1032int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long);
1033
1034/*
1035 * call_event.c
1036 */
1037void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial,
1038			enum rxrpc_propose_ack_trace why);
1039void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t,
1040			     enum rxrpc_propose_ack_trace);
1041void rxrpc_resend_tlp(struct rxrpc_call *call);
1042void rxrpc_transmit_some_data(struct rxrpc_call *call, unsigned int limit,
1043			      enum rxrpc_txdata_trace trace);
1044bool rxrpc_input_call_event(struct rxrpc_call *call);
1045
1046/*
1047 * call_object.c
1048 */
1049extern const char *const rxrpc_call_states[];
1050extern const char *const rxrpc_call_completions[];
1051extern struct kmem_cache *rxrpc_call_jar;
1052
1053void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what);
1054struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
1055struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
1056struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
1057					 struct rxrpc_conn_parameters *,
1058					 struct rxrpc_call_params *, gfp_t,
1059					 unsigned int)
1060	__releases(&rx->sk.sk_lock)
1061	__acquires(&call->user_mutex);
1062void rxrpc_start_call_timer(struct rxrpc_call *call);
1063void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
1064			 struct sk_buff *);
1065void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
1066void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
1067void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace);
1068struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
1069void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
1070void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
1071void rxrpc_cleanup_call(struct rxrpc_call *);
1072void rxrpc_destroy_all_calls(struct rxrpc_net *);
1073
1074static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
1075{
1076	return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
1077}
1078
1079static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
1080{
1081	return !rxrpc_is_service_call(call);
1082}
1083
1084/*
1085 * call_state.c
1086 */
1087bool rxrpc_set_call_completion(struct rxrpc_call *call,
1088			       enum rxrpc_call_completion compl,
1089			       u32 abort_code,
1090			       int error);
1091bool rxrpc_call_completed(struct rxrpc_call *call);
1092bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
1093		      u32 abort_code, int error, enum rxrpc_abort_reason why);
1094void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl,
1095			int error);
1096
1097static inline void rxrpc_set_call_state(struct rxrpc_call *call,
1098					enum rxrpc_call_state state)
1099{
1100	/* Order write of completion info before write of ->state. */
1101	smp_store_release(&call->_state, state);
1102	wake_up(&call->waitq);
1103}
1104
1105static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call)
1106{
1107	return call->_state; /* Only inside I/O thread */
1108}
1109
1110static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call)
1111{
1112	return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
1113}
1114
1115static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call)
1116{
1117	/* Order read ->state before read of completion info. */
1118	return smp_load_acquire(&call->_state);
1119}
1120
1121static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call)
1122{
1123	return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
1124}
1125
1126static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call)
1127{
1128	return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED;
1129}
1130
1131/*
1132 * conn_client.c
1133 */
1134extern unsigned int rxrpc_reap_client_connections;
1135extern unsigned long rxrpc_conn_idle_client_expiry;
1136extern unsigned long rxrpc_conn_idle_client_fast_expiry;
1137
1138void rxrpc_purge_client_connections(struct rxrpc_local *local);
1139struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
1140void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
1141int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp);
1142void rxrpc_connect_client_calls(struct rxrpc_local *local);
1143void rxrpc_expose_client_call(struct rxrpc_call *);
1144void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *);
1145void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle);
1146void rxrpc_discard_expired_client_conns(struct rxrpc_local *local);
1147void rxrpc_clean_up_local_conns(struct rxrpc_local *);
1148
1149/*
1150 * conn_event.c
1151 */
1152void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb,
1153				unsigned int channel);
1154int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb,
1155		     s32 abort_code, int err, enum rxrpc_abort_reason why);
1156void rxrpc_process_connection(struct work_struct *);
1157void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
1158bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb);
1159void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb);
1160
1161static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn)
1162{
1163	/* Order reading the abort info after the state check. */
1164	return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED;
1165}
1166
1167/*
1168 * conn_object.c
1169 */
1170extern unsigned int rxrpc_connection_expiry;
1171extern unsigned int rxrpc_closed_conn_expiry;
1172
1173void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why);
1174struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t);
1175struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *,
1176							  struct sockaddr_rxrpc *,
1177							  struct sk_buff *);
1178void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
1179void rxrpc_disconnect_call(struct rxrpc_call *);
1180void rxrpc_kill_client_conn(struct rxrpc_connection *);
1181void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
1182void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1183struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *,
1184					      enum rxrpc_conn_trace);
1185struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *,
1186						    enum rxrpc_conn_trace);
1187void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1188void rxrpc_service_connection_reaper(struct work_struct *);
1189void rxrpc_destroy_all_connections(struct rxrpc_net *);
1190
1191static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
1192{
1193	return conn->out_clientflag;
1194}
1195
1196static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
1197{
1198	return !rxrpc_conn_is_client(conn);
1199}
1200
1201static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
1202					   unsigned long expire_at)
1203{
1204	timer_reduce(&conn->timer, expire_at);
1205}
1206
1207/*
1208 * conn_service.c
1209 */
1210struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
1211						     struct sk_buff *);
1212struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
1213void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *,
1214				   const struct rxrpc_security *, struct sk_buff *);
1215void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
1216
1217/*
1218 * input.c
1219 */
1220void rxrpc_congestion_degrade(struct rxrpc_call *);
1221void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *);
1222void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *);
1223
1224/*
1225 * input_rack.c
1226 */
1227void rxrpc_input_rack_one(struct rxrpc_call *call,
1228			  struct rxrpc_ack_summary *summary,
1229			  struct rxrpc_txqueue *tq,
1230			  unsigned int ix);
1231void rxrpc_input_rack(struct rxrpc_call *call,
1232		      struct rxrpc_ack_summary *summary,
1233		      struct rxrpc_txqueue *tq,
1234		      unsigned long new_acks);
1235void rxrpc_rack_detect_loss_and_arm_timer(struct rxrpc_call *call,
1236					  struct rxrpc_ack_summary *summary);
1237ktime_t rxrpc_tlp_calc_pto(struct rxrpc_call *call, ktime_t now);
1238void rxrpc_tlp_send_probe(struct rxrpc_call *call);
1239void rxrpc_tlp_process_ack(struct rxrpc_call *call, struct rxrpc_ack_summary *summary);
1240void rxrpc_rack_timer_expired(struct rxrpc_call *call, ktime_t overran_by);
1241
1242/* Initialise TLP state [RFC8958 7.1]. */
1243static inline void rxrpc_tlp_init(struct rxrpc_call *call)
1244{
1245	call->tlp_serial = 0;
1246	call->tlp_seq = call->acks_hard_ack;
1247	call->tlp_is_retrans = false;
1248}
1249
1250/*
1251 * io_thread.c
1252 */
1253int rxrpc_encap_rcv(struct sock *, struct sk_buff *);
1254void rxrpc_error_report(struct sock *);
1255bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
1256			s32 abort_code, int err);
1257bool rxrpc_direct_conn_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
1258			     s32 abort_code, int err);
1259int rxrpc_io_thread(void *data);
1260void rxrpc_post_response(struct rxrpc_connection *conn, struct sk_buff *skb);
1261static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local)
1262{
1263	if (!local->io_thread)
1264		return;
1265	wake_up_process(READ_ONCE(local->io_thread));
1266}
1267
1268static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why)
1269{
1270	return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO);
1271}
1272
1273/*
1274 * insecure.c
1275 */
1276extern const struct rxrpc_security rxrpc_no_security;
1277
1278/*
1279 * key.c
1280 */
1281extern struct key_type key_type_rxrpc;
1282
1283int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int);
1284int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
1285			      u32);
1286
1287/*
1288 * local_event.c
1289 */
1290void rxrpc_gen_version_string(void);
1291void rxrpc_send_version_request(struct rxrpc_local *local,
1292				struct rxrpc_host_header *hdr,
1293				struct sk_buff *skb);
1294
1295/*
1296 * local_object.c
1297 */
1298void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set);
1299struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1300struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace);
1301struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace);
1302void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace);
1303struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace);
1304void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace);
1305void rxrpc_destroy_local(struct rxrpc_local *local);
1306void rxrpc_destroy_all_locals(struct rxrpc_net *);
1307
1308static inline bool __rxrpc_use_local(struct rxrpc_local *local,
1309				     enum rxrpc_local_trace why)
1310{
1311	int r, u;
1312
1313	r = refcount_read(&local->ref);
1314	u = atomic_fetch_add_unless(&local->active_users, 1, 0);
1315	trace_rxrpc_local(local->debug_id, why, r, u);
1316	return u != 0;
1317}
1318
1319static inline void rxrpc_see_local(struct rxrpc_local *local,
1320				   enum rxrpc_local_trace why)
1321{
1322	int r, u;
1323
1324	r = refcount_read(&local->ref);
1325	u = atomic_read(&local->active_users);
1326	trace_rxrpc_local(local->debug_id, why, r, u);
1327}
1328
1329/*
1330 * misc.c
1331 */
1332extern unsigned int rxrpc_max_backlog __read_mostly;
1333extern unsigned long rxrpc_soft_ack_delay;
1334extern unsigned long rxrpc_idle_ack_delay;
1335extern unsigned int rxrpc_rx_window_size;
1336extern unsigned int rxrpc_rx_mtu;
1337extern unsigned int rxrpc_rx_jumbo_max;
1338#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
1339extern unsigned long rxrpc_inject_rx_delay;
1340#endif
1341
1342/*
1343 * net_ns.c
1344 */
1345extern unsigned int rxrpc_net_id;
1346extern struct pernet_operations rxrpc_net_ops;
1347
1348static inline struct rxrpc_net *rxrpc_net(struct net *net)
1349{
1350	return net_generic(net, rxrpc_net_id);
1351}
1352
1353/*
1354 * out_of_band.c
1355 */
1356void rxrpc_notify_socket_oob(struct rxrpc_call *call, struct sk_buff *skb);
1357void rxrpc_add_pending_oob(struct rxrpc_sock *rx, struct sk_buff *skb);
1358int rxrpc_sendmsg_oob(struct rxrpc_sock *rx, struct msghdr *msg, size_t len);
1359
1360/*
1361 * output.c
1362 */
1363ssize_t do_udp_sendmsg(struct socket *socket, struct msghdr *msg, size_t len);
1364void rxrpc_send_ACK(struct rxrpc_call *call, u8 ack_reason,
1365		    rxrpc_serial_t serial, enum rxrpc_propose_ack_trace why);
1366void rxrpc_send_probe_for_pmtud(struct rxrpc_call *call);
1367int rxrpc_send_abort_packet(struct rxrpc_call *);
1368void rxrpc_send_data_packet(struct rxrpc_call *call, struct rxrpc_send_data_req *req);
1369void rxrpc_send_conn_abort(struct rxrpc_connection *conn);
1370void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb);
1371void rxrpc_send_keepalive(struct rxrpc_peer *);
1372void rxrpc_send_response(struct rxrpc_connection *conn, struct sk_buff *skb);
1373
1374/*
1375 * peer_event.c
1376 */
1377void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *);
1378void rxrpc_peer_keepalive_worker(struct work_struct *);
1379void rxrpc_input_probe_for_pmtud(struct rxrpc_connection *conn, rxrpc_serial_t acked_serial,
1380				 bool sendmsg_fail);
1381
1382/* Update the last transmission time on a peer for keepalive purposes. */
1383static inline void rxrpc_peer_mark_tx(struct rxrpc_peer *peer)
1384{
1385	/* To avoid tearing on 32-bit systems, we only keep the LSW. */
1386	WRITE_ONCE(peer->last_tx_at, ktime_get_seconds());
1387}
1388
1389/*
1390 * peer_object.c
1391 */
1392struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1393					 const struct sockaddr_rxrpc *);
1394struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local,
1395				     struct sockaddr_rxrpc *srx, gfp_t gfp);
1396void rxrpc_assess_MTU_size(struct rxrpc_local *local, struct rxrpc_peer *peer);
1397struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t,
1398				    enum rxrpc_peer_trace);
1399void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer);
1400void rxrpc_destroy_all_peers(struct rxrpc_net *);
1401struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1402struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace);
1403void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1404
1405/*
1406 * proc.c
1407 */
1408extern const struct seq_operations rxrpc_call_seq_ops;
1409extern const struct seq_operations rxrpc_connection_seq_ops;
1410extern const struct seq_operations rxrpc_bundle_seq_ops;
1411extern const struct seq_operations rxrpc_peer_seq_ops;
1412extern const struct seq_operations rxrpc_local_seq_ops;
1413
1414/*
1415 * recvmsg.c
1416 */
1417void rxrpc_notify_socket(struct rxrpc_call *);
1418int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1419
1420/*
1421 * Abort a call due to a protocol error.
1422 */
1423static inline int rxrpc_abort_eproto(struct rxrpc_call *call,
1424				     struct sk_buff *skb,
1425				     s32 abort_code,
1426				     enum rxrpc_abort_reason why)
1427{
1428	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
1429
1430	rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why);
1431	return -EPROTO;
1432}
1433
1434/*
1435 * rtt.c
1436 */
1437void rxrpc_call_add_rtt(struct rxrpc_call *call, enum rxrpc_rtt_rx_trace why,
1438			int rtt_slot,
1439			rxrpc_serial_t send_serial, rxrpc_serial_t resp_serial,
1440			ktime_t send_time, ktime_t resp_time);
1441ktime_t rxrpc_get_rto_backoff(struct rxrpc_call *call, bool retrans);
1442void rxrpc_call_init_rtt(struct rxrpc_call *call);
1443
1444/*
1445 * rxgk.c
1446 */
1447extern const struct rxrpc_security rxgk_yfs;
1448
1449/*
1450 * rxkad.c
1451 */
1452#ifdef CONFIG_RXKAD
1453extern const struct rxrpc_security rxkad;
1454#endif
1455
1456/*
1457 * security.c
1458 */
1459int __init rxrpc_init_security(void);
1460const struct rxrpc_security *rxrpc_security_lookup(u8);
1461void rxrpc_exit_security(void);
1462int rxrpc_init_client_call_security(struct rxrpc_call *);
1463int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1464const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *,
1465							 struct sk_buff *);
1466struct key *rxrpc_look_up_server_security(struct rxrpc_connection *,
1467					  struct sk_buff *, u32, u32);
1468
1469/*
1470 * sendmsg.c
1471 */
1472bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error,
1473			 enum rxrpc_abort_reason why);
1474int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1475
1476/*
1477 * server_key.c
1478 */
1479extern struct key_type key_type_rxrpc_s;
1480
1481int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int);
1482
1483/*
1484 * skbuff.c
1485 */
1486void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1487void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1488void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1489void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
1490void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1491void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1492void rxrpc_purge_queue(struct sk_buff_head *);
1493
1494/*
1495 * stats.c
1496 */
1497int rxrpc_stats_show(struct seq_file *seq, void *v);
1498int rxrpc_stats_clear(struct file *file, char *buf, size_t size);
1499
1500#define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s)
1501#define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s)
1502
1503/*
1504 * sysctl.c
1505 */
1506#ifdef CONFIG_SYSCTL
1507extern int __init rxrpc_sysctl_init(void);
1508extern void rxrpc_sysctl_exit(void);
1509#else
1510static inline int __init rxrpc_sysctl_init(void) { return 0; }
1511static inline void rxrpc_sysctl_exit(void) {}
1512#endif
1513
1514/*
1515 * txbuf.c
1516 */
1517extern atomic_t rxrpc_nr_txbuf;
1518struct rxrpc_txbuf *rxrpc_alloc_data_txbuf(struct rxrpc_call *call, size_t data_size,
1519					   size_t data_align, gfp_t gfp);
1520void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1521void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1522
1523/*
1524 * utils.c
1525 */
1526int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1527
1528static inline bool before(u32 seq1, u32 seq2)
1529{
1530        return (s32)(seq1 - seq2) < 0;
1531}
1532static inline bool before_eq(u32 seq1, u32 seq2)
1533{
1534        return (s32)(seq1 - seq2) <= 0;
1535}
1536static inline bool after(u32 seq1, u32 seq2)
1537{
1538        return (s32)(seq1 - seq2) > 0;
1539}
1540static inline bool after_eq(u32 seq1, u32 seq2)
1541{
1542        return (s32)(seq1 - seq2) >= 0;
1543}
1544
1545static inline u32 earliest(u32 seq1, u32 seq2)
1546{
1547	return before(seq1, seq2) ? seq1 : seq2;
1548}
1549
1550static inline u32 latest(u32 seq1, u32 seq2)
1551{
1552	return after(seq1, seq2) ? seq1 : seq2;
1553}
1554
1555static inline bool rxrpc_seq_in_txq(const struct rxrpc_txqueue *tq, rxrpc_seq_t seq)
1556{
1557	return (seq & (RXRPC_NR_TXQUEUE - 1)) == tq->qbase;
1558}
1559
1560static inline void rxrpc_queue_rx_call_packet(struct rxrpc_call *call, struct sk_buff *skb)
1561{
1562	rxrpc_get_skb(skb, rxrpc_skb_get_call_rx);
1563	__skb_queue_tail(&call->rx_queue, skb);
1564	rxrpc_poke_call(call, rxrpc_call_poke_rx_packet);
1565}
1566
1567/*
1568 * Calculate how much space there is for transmitting more DATA packets.
1569 */
1570static inline unsigned int rxrpc_tx_window_space(const struct rxrpc_call *call)
1571{
1572	int winsize = umin(call->tx_winsize, call->cong_cwnd + call->cong_extra);
1573	int transmitted = call->tx_top - call->tx_bottom;
1574
1575	return max(winsize - transmitted, 0);
1576}
1577
1578static inline unsigned int rxrpc_left_out(const struct rxrpc_call *call)
1579{
1580	return call->acks_nr_sacks + call->tx_nr_lost;
1581}
1582
1583/*
1584 * Calculate the number of transmitted DATA packets assumed to be in flight
1585 * [approx RFC6675].
1586 */
1587static inline unsigned int rxrpc_tx_in_flight(const struct rxrpc_call *call)
1588{
1589	return call->tx_nr_sent - rxrpc_left_out(call) + call->tx_nr_resent;
1590}
1591
1592/*
1593 * debug tracing
1594 */
1595extern unsigned int rxrpc_debug;
1596
1597#define dbgprintk(FMT,...) \
1598	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1599
1600#define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1601#define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1602#define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
1603
1604
1605#if defined(__KDEBUG)
1606#define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
1607#define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
1608#define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
1609
1610#elif defined(CONFIG_AF_RXRPC_DEBUG)
1611#define RXRPC_DEBUG_KENTER	0x01
1612#define RXRPC_DEBUG_KLEAVE	0x02
1613#define RXRPC_DEBUG_KDEBUG	0x04
1614
1615#define _enter(FMT,...)					\
1616do {							\
1617	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER))	\
1618		kenter(FMT,##__VA_ARGS__);		\
1619} while (0)
1620
1621#define _leave(FMT,...)					\
1622do {							\
1623	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE))	\
1624		kleave(FMT,##__VA_ARGS__);		\
1625} while (0)
1626
1627#define _debug(FMT,...)					\
1628do {							\
1629	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG))	\
1630		kdebug(FMT,##__VA_ARGS__);		\
1631} while (0)
1632
1633#else
1634#define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1635#define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1636#define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
1637#endif
1638
1639/*
1640 * debug assertion checking
1641 */
1642#if 1 // defined(__KDEBUGALL)
1643
1644#define ASSERT(X)						\
1645do {								\
1646	if (unlikely(!(X))) {					\
1647		pr_err("Assertion failed\n");			\
1648		BUG();						\
1649	}							\
1650} while (0)
1651
1652#define ASSERTCMP(X, OP, Y)						\
1653do {									\
1654	__typeof__(X) _x = (X);						\
1655	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1656	if (unlikely(!(_x OP _y))) {					\
1657		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1658		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1659		       (unsigned long)_y, (unsigned long)_y);		\
1660		BUG();							\
1661	}								\
1662} while (0)
1663
1664#define ASSERTIF(C, X)						\
1665do {								\
1666	if (unlikely((C) && !(X))) {				\
1667		pr_err("Assertion failed\n");			\
1668		BUG();						\
1669	}							\
1670} while (0)
1671
1672#define ASSERTIFCMP(C, X, OP, Y)					\
1673do {									\
1674	__typeof__(X) _x = (X);						\
1675	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1676	if (unlikely((C) && !(_x OP _y))) {				\
1677		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1678		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1679		       (unsigned long)_y, (unsigned long)_y);		\
1680		BUG();							\
1681	}								\
1682} while (0)
1683
1684#else
1685
1686#define ASSERT(X)				\
1687do {						\
1688} while (0)
1689
1690#define ASSERTCMP(X, OP, Y)			\
1691do {						\
1692} while (0)
1693
1694#define ASSERTIF(C, X)				\
1695do {						\
1696} while (0)
1697
1698#define ASSERTIFCMP(C, X, OP, Y)		\
1699do {						\
1700} while (0)
1701
1702#endif /* __KDEBUGALL */