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;
  33
  34/*
  35 * Mark applied to socket buffers in skb->mark.  skb->priority is used
  36 * to pass supplementary information.
  37 */
  38enum rxrpc_skb_mark {
  39	RXRPC_SKB_MARK_PACKET,		/* Received packet */
  40	RXRPC_SKB_MARK_ERROR,		/* Error notification */
  41	RXRPC_SKB_MARK_SERVICE_CONN_SECURED, /* Service connection response has been verified */
  42	RXRPC_SKB_MARK_REJECT_BUSY,	/* Reject with BUSY */
  43	RXRPC_SKB_MARK_REJECT_ABORT,	/* Reject with ABORT (code in skb->priority) */
  44};
  45
  46/*
  47 * sk_state for RxRPC sockets
  48 */
  49enum {
  50	RXRPC_UNBOUND = 0,
  51	RXRPC_CLIENT_UNBOUND,		/* Unbound socket used as client */
  52	RXRPC_CLIENT_BOUND,		/* client local address bound */
  53	RXRPC_SERVER_BOUND,		/* server local address bound */
  54	RXRPC_SERVER_BOUND2,		/* second server local address bound */
  55	RXRPC_SERVER_LISTENING,		/* server listening for connections */
  56	RXRPC_SERVER_LISTEN_DISABLED,	/* server listening disabled */
  57	RXRPC_CLOSE,			/* socket is being closed */
  58};
  59
  60/*
  61 * Per-network namespace data.
  62 */
  63struct rxrpc_net {
  64	struct proc_dir_entry	*proc_net;	/* Subdir in /proc/net */
  65	u32			epoch;		/* Local epoch for detecting local-end reset */
  66	struct list_head	calls;		/* List of calls active in this namespace */
  67	spinlock_t		call_lock;	/* Lock for ->calls */
  68	atomic_t		nr_calls;	/* Count of allocated calls */
  69
  70	atomic_t		nr_conns;
  71	struct list_head	bundle_proc_list; /* List of bundles for proc */
  72	struct list_head	conn_proc_list;	/* List of conns in this namespace for proc */
  73	struct list_head	service_conns;	/* Service conns in this namespace */
  74	rwlock_t		conn_lock;	/* Lock for ->conn_proc_list, ->service_conns */
  75	struct work_struct	service_conn_reaper;
  76	struct timer_list	service_conn_reap_timer;
  77
  78	bool			live;
  79
  80	atomic_t		nr_client_conns;
  81
  82	struct hlist_head	local_endpoints;
  83	struct mutex		local_mutex;	/* Lock for ->local_endpoints */
  84
  85	DECLARE_HASHTABLE	(peer_hash, 10);
  86	spinlock_t		peer_hash_lock;	/* Lock for ->peer_hash */
  87
  88#define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
  89	u8			peer_keepalive_cursor;
  90	time64_t		peer_keepalive_base;
  91	struct list_head	peer_keepalive[32];
  92	struct list_head	peer_keepalive_new;
  93	struct timer_list	peer_keepalive_timer;
  94	struct work_struct	peer_keepalive_work;
  95
  96	atomic_t		stat_tx_data;
  97	atomic_t		stat_tx_data_retrans;
  98	atomic_t		stat_tx_data_send;
  99	atomic_t		stat_tx_data_send_frag;
 100	atomic_t		stat_tx_data_send_fail;
 101	atomic_t		stat_tx_data_underflow;
 102	atomic_t		stat_tx_data_cwnd_reset;
 103	atomic_t		stat_rx_data;
 104	atomic_t		stat_rx_data_reqack;
 105	atomic_t		stat_rx_data_jumbo;
 106
 107	atomic_t		stat_tx_ack_fill;
 108	atomic_t		stat_tx_ack_send;
 109	atomic_t		stat_tx_ack_skip;
 110	atomic_t		stat_tx_acks[256];
 111	atomic_t		stat_rx_acks[256];
 112
 113	atomic_t		stat_why_req_ack[8];
 114
 115	atomic_t		stat_io_loop;
 116};
 117
 118/*
 119 * Service backlog preallocation.
 120 *
 121 * This contains circular buffers of preallocated peers, connections and calls
 122 * for incoming service calls and their head and tail pointers.  This allows
 123 * calls to be set up in the data_ready handler, thereby avoiding the need to
 124 * shuffle packets around so much.
 125 */
 126struct rxrpc_backlog {
 127	unsigned short		peer_backlog_head;
 128	unsigned short		peer_backlog_tail;
 129	unsigned short		conn_backlog_head;
 130	unsigned short		conn_backlog_tail;
 131	unsigned short		call_backlog_head;
 132	unsigned short		call_backlog_tail;
 133#define RXRPC_BACKLOG_MAX	32
 134	struct rxrpc_peer	*peer_backlog[RXRPC_BACKLOG_MAX];
 135	struct rxrpc_connection	*conn_backlog[RXRPC_BACKLOG_MAX];
 136	struct rxrpc_call	*call_backlog[RXRPC_BACKLOG_MAX];
 137};
 138
 139/*
 140 * RxRPC socket definition
 141 */
 142struct rxrpc_sock {
 143	/* WARNING: sk has to be the first member */
 144	struct sock		sk;
 145	rxrpc_notify_new_call_t	notify_new_call; /* Func to notify of new call */
 146	rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
 147	struct rxrpc_local	*local;		/* local endpoint */
 148	struct rxrpc_backlog	*backlog;	/* Preallocation for services */
 149	spinlock_t		incoming_lock;	/* Incoming call vs service shutdown lock */
 150	struct list_head	sock_calls;	/* List of calls owned by this socket */
 151	struct list_head	to_be_accepted;	/* calls awaiting acceptance */
 152	struct list_head	recvmsg_q;	/* Calls awaiting recvmsg's attention  */
 153	spinlock_t		recvmsg_lock;	/* Lock for recvmsg_q */
 154	struct key		*key;		/* security for this socket */
 155	struct key		*securities;	/* list of server security descriptors */
 156	struct rb_root		calls;		/* User ID -> call mapping */
 157	unsigned long		flags;
 158#define RXRPC_SOCK_CONNECTED		0	/* connect_srx is set */
 159	rwlock_t		call_lock;	/* lock for calls */
 160	u32			min_sec_level;	/* minimum security level */
 161#define RXRPC_SECURITY_MAX	RXRPC_SECURITY_ENCRYPT
 162	bool			exclusive;	/* Exclusive connection for a client socket */
 163	u16			second_service;	/* Additional service bound to the endpoint */
 164	struct {
 165		/* Service upgrade information */
 166		u16		from;		/* Service ID to upgrade (if not 0) */
 167		u16		to;		/* service ID to upgrade to */
 168	} service_upgrade;
 169	sa_family_t		family;		/* Protocol family created with */
 170	struct sockaddr_rxrpc	srx;		/* Primary Service/local addresses */
 171	struct sockaddr_rxrpc	connect_srx;	/* Default client address from connect() */
 172};
 173
 174#define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
 175
 176/*
 177 * CPU-byteorder normalised Rx packet header.
 178 */
 179struct rxrpc_host_header {
 180	u32		epoch;		/* client boot timestamp */
 181	u32		cid;		/* connection and channel ID */
 182	u32		callNumber;	/* call ID (0 for connection-level packets) */
 183	u32		seq;		/* sequence number of pkt in call stream */
 184	u32		serial;		/* serial number of pkt sent to network */
 185	u8		type;		/* packet type */
 186	u8		flags;		/* packet flags */
 187	u8		userStatus;	/* app-layer defined status */
 188	u8		securityIndex;	/* security protocol ID */
 189	union {
 190		u16	_rsvd;		/* reserved */
 191		u16	cksum;		/* kerberos security checksum */
 192	};
 193	u16		serviceId;	/* service ID */
 194} __packed;
 195
 196/*
 197 * RxRPC socket buffer private variables
 198 * - max 48 bytes (struct sk_buff::cb)
 199 */
 200struct rxrpc_skb_priv {
 201	struct rxrpc_connection *conn;	/* Connection referred to (poke packet) */
 202	union {
 
 203		struct {
 204			u16		offset;		/* Offset of data */
 205			u16		len;		/* Length of data */
 206			u8		flags;
 207#define RXRPC_RX_VERIFIED	0x01
 208		};
 209		struct {
 210			rxrpc_seq_t	first_ack;	/* First packet in acks table */
 
 
 
 211			u8		nr_acks;	/* Number of acks+nacks */
 212			u8		nr_nacks;	/* Number of nacks */
 213		};
 214	};
 215	struct rxrpc_host_header hdr;	/* RxRPC packet header from this packet */
 216};
 217
 218#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 219
 220/*
 221 * RxRPC security module interface
 222 */
 223struct rxrpc_security {
 224	const char		*name;		/* name of this service */
 225	u8			security_index;	/* security type provided */
 226	u32			no_key_abort;	/* Abort code indicating no key */
 227
 228	/* Initialise a security service */
 229	int (*init)(void);
 230
 231	/* Clean up a security service */
 232	void (*exit)(void);
 233
 234	/* Parse the information from a server key */
 235	int (*preparse_server_key)(struct key_preparsed_payload *);
 236
 237	/* Clean up the preparse buffer after parsing a server key */
 238	void (*free_preparse_server_key)(struct key_preparsed_payload *);
 239
 240	/* Destroy the payload of a server key */
 241	void (*destroy_server_key)(struct key *);
 242
 243	/* Describe a server key */
 244	void (*describe_server_key)(const struct key *, struct seq_file *);
 245
 246	/* initialise a connection's security */
 247	int (*init_connection_security)(struct rxrpc_connection *,
 248					struct rxrpc_key_token *);
 249
 250	/* Work out how much data we can store in a packet, given an estimate
 251	 * of the amount of data remaining.
 252	 */
 253	int (*how_much_data)(struct rxrpc_call *, size_t,
 254			     size_t *, size_t *, size_t *);
 255
 256	/* impose security on a packet */
 257	int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *);
 258
 259	/* verify the security on a received packet */
 260	int (*verify_packet)(struct rxrpc_call *, struct sk_buff *);
 261
 262	/* Free crypto request on a call */
 263	void (*free_call_crypto)(struct rxrpc_call *);
 264
 265	/* issue a challenge */
 266	int (*issue_challenge)(struct rxrpc_connection *);
 267
 268	/* respond to a challenge */
 269	int (*respond_to_challenge)(struct rxrpc_connection *,
 270				    struct sk_buff *);
 271
 272	/* verify a response */
 273	int (*verify_response)(struct rxrpc_connection *,
 274			       struct sk_buff *);
 275
 276	/* clear connection security */
 277	void (*clear)(struct rxrpc_connection *);
 278};
 279
 280/*
 281 * RxRPC local transport endpoint description
 282 * - owned by a single AF_RXRPC socket
 283 * - pointed to by transport socket struct sk_user_data
 284 */
 285struct rxrpc_local {
 286	struct rcu_head		rcu;
 287	atomic_t		active_users;	/* Number of users of the local endpoint */
 288	refcount_t		ref;		/* Number of references to the structure */
 289	struct net		*net;		/* The network namespace */
 290	struct rxrpc_net	*rxnet;		/* Our bits in the network namespace */
 291	struct hlist_node	link;
 292	struct socket		*socket;	/* my UDP socket */
 293	struct task_struct	*io_thread;
 294	struct completion	io_thread_ready; /* Indication that the I/O thread started */
 
 295	struct rxrpc_sock	*service;	/* Service(s) listening on this endpoint */
 296#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
 297	struct sk_buff_head	rx_delay_queue;	/* Delay injection queue */
 298#endif
 299	struct sk_buff_head	rx_queue;	/* Received packets */
 300	struct list_head	conn_attend_q;	/* Conns requiring immediate attention */
 301	struct list_head	call_attend_q;	/* Calls requiring immediate attention */
 302
 303	struct rb_root		client_bundles;	/* Client connection bundles by socket params */
 304	spinlock_t		client_bundles_lock; /* Lock for client_bundles */
 305	bool			kill_all_client_conns;
 306	struct list_head	idle_client_conns;
 307	struct timer_list	client_conn_reap_timer;
 308	unsigned long		client_conn_flags;
 309#define RXRPC_CLIENT_CONN_REAP_TIMER	0	/* The client conn reap timer expired */
 310
 311	spinlock_t		lock;		/* access lock */
 312	rwlock_t		services_lock;	/* lock for services list */
 313	int			debug_id;	/* debug ID for printks */
 314	bool			dead;
 315	bool			service_closed;	/* Service socket closed */
 316	struct idr		conn_ids;	/* List of connection IDs */
 317	struct list_head	new_client_calls; /* Newly created client calls need connection */
 318	spinlock_t		client_call_lock; /* Lock for ->new_client_calls */
 319	struct sockaddr_rxrpc	srx;		/* local address */
 320};
 321
 322/*
 323 * RxRPC remote transport endpoint definition
 324 * - matched by local endpoint, remote port, address and protocol type
 325 */
 326struct rxrpc_peer {
 327	struct rcu_head		rcu;		/* This must be first */
 328	refcount_t		ref;
 329	unsigned long		hash_key;
 330	struct hlist_node	hash_link;
 331	struct rxrpc_local	*local;
 332	struct hlist_head	error_targets;	/* targets for net error distribution */
 333	struct rb_root		service_conns;	/* Service connections */
 334	struct list_head	keepalive_link;	/* Link in net->peer_keepalive[] */
 335	time64_t		last_tx_at;	/* Last time packet sent here */
 336	seqlock_t		service_conn_lock;
 337	spinlock_t		lock;		/* access lock */
 338	unsigned int		if_mtu;		/* interface MTU for this peer */
 339	unsigned int		mtu;		/* network MTU for this peer */
 340	unsigned int		maxdata;	/* data size (MTU - hdrsize) */
 341	unsigned short		hdrsize;	/* header size (IP + UDP + RxRPC) */
 342	int			debug_id;	/* debug ID for printks */
 343	struct sockaddr_rxrpc	srx;		/* remote address */
 344
 345	/* calculated RTT cache */
 346#define RXRPC_RTT_CACHE_SIZE 32
 347	spinlock_t		rtt_input_lock;	/* RTT lock for input routine */
 348	ktime_t			rtt_last_req;	/* Time of last RTT request */
 349	unsigned int		rtt_count;	/* Number of samples we've got */
 350
 351	u32			srtt_us;	/* smoothed round trip time << 3 in usecs */
 352	u32			mdev_us;	/* medium deviation			*/
 353	u32			mdev_max_us;	/* maximal mdev for the last rtt period	*/
 354	u32			rttvar_us;	/* smoothed mdev_max			*/
 355	u32			rto_j;		/* Retransmission timeout in jiffies */
 356	u8			backoff;	/* Backoff timeout */
 357
 358	u8			cong_ssthresh;	/* Congestion slow-start threshold */
 359};
 360
 361/*
 362 * Keys for matching a connection.
 363 */
 364struct rxrpc_conn_proto {
 365	union {
 366		struct {
 367			u32	epoch;		/* epoch of this connection */
 368			u32	cid;		/* connection ID */
 369		};
 370		u64		index_key;
 371	};
 372};
 373
 374struct rxrpc_conn_parameters {
 375	struct rxrpc_local	*local;		/* Representation of local endpoint */
 376	struct rxrpc_peer	*peer;		/* Representation of remote endpoint */
 377	struct key		*key;		/* Security details */
 378	bool			exclusive;	/* T if conn is exclusive */
 379	bool			upgrade;	/* T if service ID can be upgraded */
 380	u16			service_id;	/* Service ID for this connection */
 381	u32			security_level;	/* Security level selected */
 382};
 383
 384/*
 385 * Call completion condition (state == RXRPC_CALL_COMPLETE).
 386 */
 387enum rxrpc_call_completion {
 388	RXRPC_CALL_SUCCEEDED,		/* - Normal termination */
 389	RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
 390	RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
 391	RXRPC_CALL_LOCAL_ERROR,		/* - call failed due to local error */
 392	RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
 393	NR__RXRPC_CALL_COMPLETIONS
 394};
 395
 396/*
 397 * Bits in the connection flags.
 398 */
 399enum rxrpc_conn_flag {
 400	RXRPC_CONN_IN_SERVICE_CONNS,	/* Conn is in peer->service_conns */
 401	RXRPC_CONN_DONT_REUSE,		/* Don't reuse this connection */
 402	RXRPC_CONN_PROBING_FOR_UPGRADE,	/* Probing for service upgrade */
 403	RXRPC_CONN_FINAL_ACK_0,		/* Need final ACK for channel 0 */
 404	RXRPC_CONN_FINAL_ACK_1,		/* Need final ACK for channel 1 */
 405	RXRPC_CONN_FINAL_ACK_2,		/* Need final ACK for channel 2 */
 406	RXRPC_CONN_FINAL_ACK_3,		/* Need final ACK for channel 3 */
 407};
 408
 409#define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |	\
 410				   (1UL << RXRPC_CONN_FINAL_ACK_1) |	\
 411				   (1UL << RXRPC_CONN_FINAL_ACK_2) |	\
 412				   (1UL << RXRPC_CONN_FINAL_ACK_3))
 413
 414/*
 415 * Events that can be raised upon a connection.
 416 */
 417enum rxrpc_conn_event {
 418	RXRPC_CONN_EV_CHALLENGE,	/* Send challenge packet */
 419	RXRPC_CONN_EV_ABORT_CALLS,	/* Abort attached calls */
 420};
 421
 422/*
 423 * The connection protocol state.
 424 */
 425enum rxrpc_conn_proto_state {
 426	RXRPC_CONN_UNUSED,		/* Connection not yet attempted */
 427	RXRPC_CONN_CLIENT_UNSECURED,	/* Client connection needs security init */
 428	RXRPC_CONN_CLIENT,		/* Client connection */
 429	RXRPC_CONN_SERVICE_PREALLOC,	/* Service connection preallocation */
 430	RXRPC_CONN_SERVICE_UNSECURED,	/* Service unsecured connection */
 431	RXRPC_CONN_SERVICE_CHALLENGING,	/* Service challenging for security */
 432	RXRPC_CONN_SERVICE,		/* Service secured connection */
 433	RXRPC_CONN_ABORTED,		/* Conn aborted */
 434	RXRPC_CONN__NR_STATES
 435};
 436
 437/*
 438 * RxRPC client connection bundle.
 439 */
 440struct rxrpc_bundle {
 441	struct rxrpc_local	*local;		/* Representation of local endpoint */
 442	struct rxrpc_peer	*peer;		/* Remote endpoint */
 443	struct key		*key;		/* Security details */
 444	struct list_head	proc_link;	/* Link in net->bundle_proc_list */
 445	const struct rxrpc_security *security;	/* applied security module */
 446	refcount_t		ref;
 447	atomic_t		active;		/* Number of active users */
 448	unsigned int		debug_id;
 449	u32			security_level;	/* Security level selected */
 450	u16			service_id;	/* Service ID for this connection */
 451	bool			try_upgrade;	/* True if the bundle is attempting upgrade */
 452	bool			exclusive;	/* T if conn is exclusive */
 453	bool			upgrade;	/* T if service ID can be upgraded */
 454	unsigned short		alloc_error;	/* Error from last conn allocation */
 455	struct rb_node		local_node;	/* Node in local->client_conns */
 456	struct list_head	waiting_calls;	/* Calls waiting for channels */
 457	unsigned long		avail_chans;	/* Mask of available channels */
 458	unsigned int		conn_ids[4];	/* Connection IDs. */
 459	struct rxrpc_connection	*conns[4];	/* The connections in the bundle (max 4) */
 460};
 461
 462/*
 463 * RxRPC connection definition
 464 * - matched by { local, peer, epoch, conn_id, direction }
 465 * - each connection can only handle four simultaneous calls
 466 */
 467struct rxrpc_connection {
 468	struct rxrpc_conn_proto	proto;
 469	struct rxrpc_local	*local;		/* Representation of local endpoint */
 470	struct rxrpc_peer	*peer;		/* Remote endpoint */
 471	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
 472	struct key		*key;		/* Security details */
 473	struct list_head	attend_link;	/* Link in local->conn_attend_q */
 474
 475	refcount_t		ref;
 476	atomic_t		active;		/* Active count for service conns */
 477	struct rcu_head		rcu;
 478	struct list_head	cache_link;
 479
 480	unsigned char		act_chans;	/* Mask of active channels */
 481	struct rxrpc_channel {
 482		unsigned long		final_ack_at;	/* Time at which to issue final ACK */
 483		struct rxrpc_call	*call;		/* Active call */
 484		unsigned int		call_debug_id;	/* call->debug_id */
 485		u32			call_id;	/* ID of current call */
 486		u32			call_counter;	/* Call ID counter */
 487		u32			last_call;	/* ID of last call */
 488		u8			last_type;	/* Type of last packet */
 489		union {
 490			u32		last_seq;
 491			u32		last_abort;
 492		};
 493	} channels[RXRPC_MAXCALLS];
 494
 495	struct timer_list	timer;		/* Conn event timer */
 496	struct work_struct	processor;	/* connection event processor */
 497	struct work_struct	destructor;	/* In-process-context destroyer */
 498	struct rxrpc_bundle	*bundle;	/* Client connection bundle */
 499	struct rb_node		service_node;	/* Node in peer->service_conns */
 500	struct list_head	proc_link;	/* link in procfs list */
 501	struct list_head	link;		/* link in master connection list */
 502	struct sk_buff_head	rx_queue;	/* received conn-level packets */
 
 
 503
 504	struct mutex		security_lock;	/* Lock for security management */
 505	const struct rxrpc_security *security;	/* applied security module */
 506	union {
 507		struct {
 508			struct crypto_sync_skcipher *cipher;	/* encryption handle */
 509			struct rxrpc_crypt csum_iv;	/* packet checksum base */
 510			u32	nonce;		/* response re-use preventer */
 511		} rxkad;
 512	};
 513	unsigned long		flags;
 514	unsigned long		events;
 515	unsigned long		idle_timestamp;	/* Time at which last became idle */
 516	spinlock_t		state_lock;	/* state-change lock */
 517	enum rxrpc_conn_proto_state state;	/* current state of connection */
 518	enum rxrpc_call_completion completion;	/* Completion condition */
 519	s32			abort_code;	/* Abort code of connection abort */
 520	int			debug_id;	/* debug ID for printks */
 521	rxrpc_serial_t		tx_serial;	/* Outgoing packet serial number counter */
 522	unsigned int		hi_serial;	/* highest serial number received */
 523	u32			service_id;	/* Service ID, possibly upgraded */
 524	u32			security_level;	/* Security level selected */
 525	u8			security_ix;	/* security type */
 526	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
 527	u8			bundle_shift;	/* Index into bundle->avail_chans */
 528	bool			exclusive;	/* T if conn is exclusive */
 529	bool			upgrade;	/* T if service ID can be upgraded */
 530	u16			orig_service_id; /* Originally requested service ID */
 531	short			error;		/* Local error code */
 532};
 533
 534static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
 535{
 536	return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
 537}
 538
 539static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
 540{
 541	return !rxrpc_to_server(sp);
 542}
 543
 544/*
 545 * Flags in call->flags.
 546 */
 547enum rxrpc_call_flag {
 548	RXRPC_CALL_RELEASED,		/* call has been released - no more message to userspace */
 549	RXRPC_CALL_HAS_USERID,		/* has a user ID attached */
 550	RXRPC_CALL_IS_SERVICE,		/* Call is service call */
 551	RXRPC_CALL_EXPOSED,		/* The call was exposed to the world */
 552	RXRPC_CALL_RX_LAST,		/* Received the last packet (at rxtx_top) */
 553	RXRPC_CALL_TX_LAST,		/* Last packet in Tx buffer (at rxtx_top) */
 554	RXRPC_CALL_TX_ALL_ACKED,	/* Last packet has been hard-acked */
 555	RXRPC_CALL_SEND_PING,		/* A ping will need to be sent */
 556	RXRPC_CALL_RETRANS_TIMEOUT,	/* Retransmission due to timeout occurred */
 557	RXRPC_CALL_BEGAN_RX_TIMER,	/* We began the expect_rx_by timer */
 558	RXRPC_CALL_RX_HEARD,		/* The peer responded at least once to this call */
 559	RXRPC_CALL_DISCONNECTED,	/* The call has been disconnected */
 560	RXRPC_CALL_KERNEL,		/* The call was made by the kernel */
 561	RXRPC_CALL_UPGRADE,		/* Service upgrade was requested for the call */
 562	RXRPC_CALL_EXCLUSIVE,		/* The call uses a once-only connection */
 563	RXRPC_CALL_RX_IS_IDLE,		/* recvmsg() is idle - send an ACK */
 564	RXRPC_CALL_RECVMSG_READ_ALL,	/* recvmsg() read all of the received data */
 
 565};
 566
 567/*
 568 * Events that can be raised on a call.
 569 */
 570enum rxrpc_call_event {
 571	RXRPC_CALL_EV_ACK_LOST,		/* ACK may be lost, send ping */
 572	RXRPC_CALL_EV_INITIAL_PING,	/* Send initial ping for a new service call */
 573};
 574
 575/*
 576 * The states that a call can be in.
 577 */
 578enum rxrpc_call_state {
 579	RXRPC_CALL_UNINITIALISED,
 580	RXRPC_CALL_CLIENT_AWAIT_CONN,	/* - client waiting for connection to become available */
 581	RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
 582	RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
 583	RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
 584	RXRPC_CALL_SERVER_PREALLOC,	/* - service preallocation */
 585	RXRPC_CALL_SERVER_SECURING,	/* - server securing request connection */
 586	RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
 587	RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
 588	RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
 589	RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
 590	RXRPC_CALL_COMPLETE,		/* - call complete */
 591	NR__RXRPC_CALL_STATES
 592};
 593
 594/*
 595 * Call Tx congestion management modes.
 596 */
 597enum rxrpc_congest_mode {
 598	RXRPC_CALL_SLOW_START,
 599	RXRPC_CALL_CONGEST_AVOIDANCE,
 600	RXRPC_CALL_PACKET_LOSS,
 601	RXRPC_CALL_FAST_RETRANSMIT,
 602	NR__RXRPC_CONGEST_MODES
 603};
 604
 605/*
 606 * RxRPC call definition
 607 * - matched by { connection, call_id }
 608 */
 609struct rxrpc_call {
 610	struct rcu_head		rcu;
 611	struct rxrpc_connection	*conn;		/* connection carrying call */
 612	struct rxrpc_bundle	*bundle;	/* Connection bundle to use */
 613	struct rxrpc_peer	*peer;		/* Peer record for remote address */
 614	struct rxrpc_local	*local;		/* Representation of local endpoint */
 615	struct rxrpc_sock __rcu	*socket;	/* socket responsible */
 616	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
 617	struct key		*key;		/* Security details */
 618	const struct rxrpc_security *security;	/* applied security module */
 619	struct mutex		user_mutex;	/* User access mutex */
 620	struct sockaddr_rxrpc	dest_srx;	/* Destination address */
 621	unsigned long		delay_ack_at;	/* When DELAY ACK needs to happen */
 622	unsigned long		ack_lost_at;	/* When ACK is figured as lost */
 623	unsigned long		resend_at;	/* When next resend needs to happen */
 624	unsigned long		ping_at;	/* When next to send a ping */
 625	unsigned long		keepalive_at;	/* When next to send a keepalive ping */
 626	unsigned long		expect_rx_by;	/* When we expect to get a packet by */
 627	unsigned long		expect_req_by;	/* When we expect to get a request DATA packet by */
 628	unsigned long		expect_term_by;	/* When we expect call termination by */
 629	u32			next_rx_timo;	/* Timeout for next Rx packet (jif) */
 630	u32			next_req_timo;	/* Timeout for next Rx request packet (jif) */
 631	u32			hard_timo;	/* Maximum lifetime or 0 (jif) */
 632	struct timer_list	timer;		/* Combined event timer */
 633	struct work_struct	destroyer;	/* In-process-context destroyer */
 634	rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
 635	struct list_head	link;		/* link in master call list */
 636	struct list_head	wait_link;	/* Link in local->new_client_calls */
 637	struct hlist_node	error_link;	/* link in error distribution list */
 638	struct list_head	accept_link;	/* Link in rx->acceptq */
 639	struct list_head	recvmsg_link;	/* Link in rx->recvmsg_q */
 640	struct list_head	sock_link;	/* Link in rx->sock_calls */
 641	struct rb_node		sock_node;	/* Node in rx->calls */
 642	struct list_head	attend_link;	/* Link in local->call_attend_q */
 643	struct rxrpc_txbuf	*tx_pending;	/* Tx buffer being filled */
 644	wait_queue_head_t	waitq;		/* Wait queue for channel or Tx */
 645	s64			tx_total_len;	/* Total length left to be transmitted (or -1) */
 646	unsigned long		user_call_ID;	/* user-defined call ID */
 647	unsigned long		flags;
 648	unsigned long		events;
 649	spinlock_t		notify_lock;	/* Kernel notification lock */
 650	unsigned int		send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */
 651	s32			send_abort;	/* Abort code to be sent */
 652	short			send_abort_err;	/* Error to be associated with the abort */
 653	rxrpc_seq_t		send_abort_seq;	/* DATA packet that incurred the abort (or 0) */
 654	s32			abort_code;	/* Local/remote abort code */
 655	int			error;		/* Local error incurred */
 656	enum rxrpc_call_state	_state;		/* Current state of call (needs barrier) */
 657	enum rxrpc_call_completion completion;	/* Call completion condition */
 658	refcount_t		ref;
 659	u8			security_ix;	/* Security type */
 660	enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */
 661	u32			call_id;	/* call ID on connection  */
 662	u32			cid;		/* connection ID plus channel index */
 663	u32			security_level;	/* Security level selected */
 664	int			debug_id;	/* debug ID for printks */
 665	unsigned short		rx_pkt_offset;	/* Current recvmsg packet offset */
 666	unsigned short		rx_pkt_len;	/* Current recvmsg packet len */
 667
 668	/* Transmitted data tracking. */
 669	spinlock_t		tx_lock;	/* Transmit queue lock */
 670	struct list_head	tx_sendmsg;	/* Sendmsg prepared packets */
 671	struct list_head	tx_buffer;	/* Buffer of transmissible packets */
 672	rxrpc_seq_t		tx_bottom;	/* First packet in buffer */
 673	rxrpc_seq_t		tx_transmitted;	/* Highest packet transmitted */
 674	rxrpc_seq_t		tx_prepared;	/* Highest Tx slot prepared. */
 675	rxrpc_seq_t		tx_top;		/* Highest Tx slot allocated. */
 676	u16			tx_backoff;	/* Delay to insert due to Tx failure */
 677	u8			tx_winsize;	/* Maximum size of Tx window */
 678#define RXRPC_TX_MAX_WINDOW	128
 679	ktime_t			tx_last_sent;	/* Last time a transmission occurred */
 680
 681	/* Received data tracking */
 682	struct sk_buff_head	recvmsg_queue;	/* Queue of packets ready for recvmsg() */
 683	struct sk_buff_head	rx_oos_queue;	/* Queue of out of sequence packets */
 684
 685	rxrpc_seq_t		rx_highest_seq;	/* Higest sequence number received */
 686	rxrpc_seq_t		rx_consumed;	/* Highest packet consumed */
 687	rxrpc_serial_t		rx_serial;	/* Highest serial received for this call */
 688	u8			rx_winsize;	/* Size of Rx window */
 689
 690	/* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 691	 * is fixed, we keep these numbers in terms of segments (ie. DATA
 692	 * packets) rather than bytes.
 693	 */
 694#define RXRPC_TX_SMSS		RXRPC_JUMBO_DATALEN
 695#define RXRPC_MIN_CWND		(RXRPC_TX_SMSS > 2190 ? 2 : RXRPC_TX_SMSS > 1095 ? 3 : 4)
 696	u8			cong_cwnd;	/* Congestion window size */
 697	u8			cong_extra;	/* Extra to send for congestion management */
 698	u8			cong_ssthresh;	/* Slow-start threshold */
 699	enum rxrpc_congest_mode	cong_mode:8;	/* Congestion management mode */
 700	u8			cong_dup_acks;	/* Count of ACKs showing missing packets */
 701	u8			cong_cumul_acks; /* Cumulative ACK count */
 702	ktime_t			cong_tstamp;	/* Last time cwnd was changed */
 703	struct sk_buff		*cong_last_nack; /* Last ACK with nacks received */
 704
 705	/* Receive-phase ACK management (ACKs we send). */
 706	u8			ackr_reason;	/* reason to ACK */
 707	u16			ackr_sack_base;	/* Starting slot in SACK table ring */
 708	rxrpc_seq_t		ackr_window;	/* Base of SACK window */
 709	rxrpc_seq_t		ackr_wtop;	/* Base of SACK window */
 710	unsigned int		ackr_nr_unacked; /* Number of unacked packets */
 711	atomic_t		ackr_nr_consumed; /* Number of packets needing hard ACK */
 712	struct {
 713#define RXRPC_SACK_SIZE 256
 714		 /* SACK table for soft-acked packets */
 715		u8		ackr_sack_table[RXRPC_SACK_SIZE];
 716	} __aligned(8);
 717
 718	/* RTT management */
 719	rxrpc_serial_t		rtt_serial[4];	/* Serial number of DATA or PING sent */
 720	ktime_t			rtt_sent_at[4];	/* Time packet sent */
 721	unsigned long		rtt_avail;	/* Mask of available slots in bits 0-3,
 722						 * Mask of pending samples in 8-11 */
 723#define RXRPC_CALL_RTT_AVAIL_MASK	0xf
 724#define RXRPC_CALL_RTT_PEND_SHIFT	8
 725
 726	/* Transmission-phase ACK management (ACKs we've received). */
 727	ktime_t			acks_latest_ts;	/* Timestamp of latest ACK received */
 728	rxrpc_seq_t		acks_first_seq;	/* first sequence number received */
 729	rxrpc_seq_t		acks_prev_seq;	/* Highest previousPacket received */
 730	rxrpc_seq_t		acks_hard_ack;	/* Latest hard-ack point */
 731	rxrpc_seq_t		acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 732	rxrpc_serial_t		acks_highest_serial; /* Highest serial number ACK'd */
 733};
 734
 735/*
 736 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 737 */
 738struct rxrpc_ack_summary {
 739	u16			nr_acks;		/* Number of ACKs in packet */
 740	u16			nr_new_acks;		/* Number of new ACKs in packet */
 741	u16			nr_new_nacks;		/* Number of new nacks in packet */
 742	u16			nr_retained_nacks;	/* Number of nacks retained between ACKs */
 743	u8			ack_reason;
 744	bool			saw_nacks;		/* Saw NACKs in packet */
 745	bool			new_low_nack;		/* T if new low NACK found */
 746	bool			retrans_timeo;		/* T if reTx due to timeout happened */
 747	u8			flight_size;		/* Number of unreceived transmissions */
 748	/* Place to stash values for tracing */
 749	enum rxrpc_congest_mode	mode:8;
 750	u8			cwnd;
 751	u8			ssthresh;
 752	u8			dup_acks;
 753	u8			cumulative_acks;
 754};
 755
 756/*
 757 * sendmsg() cmsg-specified parameters.
 758 */
 759enum rxrpc_command {
 760	RXRPC_CMD_SEND_DATA,		/* send data message */
 761	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
 762	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
 763	RXRPC_CMD_CHARGE_ACCEPT,	/* [server] charge accept preallocation */
 764};
 765
 766struct rxrpc_call_params {
 767	s64			tx_total_len;	/* Total Tx data length (if send data) */
 768	unsigned long		user_call_ID;	/* User's call ID */
 769	struct {
 770		u32		hard;		/* Maximum lifetime (sec) */
 771		u32		idle;		/* Max time since last data packet (msec) */
 772		u32		normal;		/* Max time since last call packet (msec) */
 773	} timeouts;
 774	u8			nr_timeouts;	/* Number of timeouts specified */
 775	bool			kernel;		/* T if kernel is making the call */
 776	enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */
 777};
 778
 779struct rxrpc_send_params {
 780	struct rxrpc_call_params call;
 781	u32			abort_code;	/* Abort code to Tx (if abort) */
 782	enum rxrpc_command	command : 8;	/* The command to implement */
 783	bool			exclusive;	/* Shared or exclusive call */
 784	bool			upgrade;	/* If the connection is upgradeable */
 785};
 786
 787/*
 788 * Buffer of data to be output as a packet.
 789 */
 790struct rxrpc_txbuf {
 791	struct rcu_head		rcu;
 792	struct list_head	call_link;	/* Link in call->tx_sendmsg/tx_buffer */
 793	struct list_head	tx_link;	/* Link in live Enc queue or Tx queue */
 794	ktime_t			last_sent;	/* Time at which last transmitted */
 795	refcount_t		ref;
 796	rxrpc_seq_t		seq;		/* Sequence number of this packet */
 
 797	unsigned int		call_debug_id;
 798	unsigned int		debug_id;
 799	unsigned int		len;		/* Amount of data in buffer */
 800	unsigned int		space;		/* Remaining data space */
 801	unsigned int		offset;		/* Offset of fill point */
 802	unsigned long		flags;
 803#define RXRPC_TXBUF_LAST	0		/* Set if last packet in Tx phase */
 804#define RXRPC_TXBUF_RESENT	1		/* Set if has been resent */
 
 
 805	u8 /*enum rxrpc_propose_ack_trace*/ ack_why;	/* If ack, why */
 806	struct {
 807		/* The packet for encrypting and DMA'ing.  We align it such
 808		 * that data[] aligns correctly for any crypto blocksize.
 809		 */
 810		u8		pad[64 - sizeof(struct rxrpc_wire_header)];
 811		struct rxrpc_wire_header wire;	/* Network-ready header */
 812		union {
 813			u8	data[RXRPC_JUMBO_DATALEN]; /* Data packet */
 814			struct {
 815				struct rxrpc_ackpacket ack;
 816				DECLARE_FLEX_ARRAY(u8, acks);
 817			};
 818		};
 819	} __aligned(64);
 820};
 821
 822static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb)
 823{
 824	return txb->wire.flags & RXRPC_CLIENT_INITIATED;
 825}
 826
 827static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb)
 828{
 829	return !rxrpc_sending_to_server(txb);
 830}
 831
 832#include <trace/events/rxrpc.h>
 833
 834/*
 835 * Allocate the next serial number on a connection.  0 must be skipped.
 836 */
 837static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn)
 838{
 839	rxrpc_serial_t serial;
 840
 841	serial = conn->tx_serial;
 842	if (serial == 0)
 843		serial = 1;
 844	conn->tx_serial = serial + 1;
 845	return serial;
 846}
 847
 848/*
 849 * af_rxrpc.c
 850 */
 851extern atomic_t rxrpc_n_rx_skbs;
 852extern struct workqueue_struct *rxrpc_workqueue;
 853
 854/*
 855 * call_accept.c
 856 */
 857int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 858void rxrpc_discard_prealloc(struct rxrpc_sock *);
 859bool rxrpc_new_incoming_call(struct rxrpc_local *local,
 860			     struct rxrpc_peer *peer,
 861			     struct rxrpc_connection *conn,
 862			     struct sockaddr_rxrpc *peer_srx,
 863			     struct sk_buff *skb);
 864void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 865int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long);
 866
 867/*
 868 * call_event.c
 869 */
 870void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial,
 871			enum rxrpc_propose_ack_trace why);
 872void rxrpc_send_ACK(struct rxrpc_call *, u8, rxrpc_serial_t, enum rxrpc_propose_ack_trace);
 873void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t,
 874			     enum rxrpc_propose_ack_trace);
 875void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *);
 876void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb);
 877
 878void rxrpc_reduce_call_timer(struct rxrpc_call *call,
 879			     unsigned long expire_at,
 880			     unsigned long now,
 881			     enum rxrpc_timer_trace why);
 882
 883bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb);
 884
 885/*
 886 * call_object.c
 887 */
 888extern const char *const rxrpc_call_states[];
 889extern const char *const rxrpc_call_completions[];
 890extern struct kmem_cache *rxrpc_call_jar;
 891
 892void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what);
 893struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 894struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
 895struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 896					 struct rxrpc_conn_parameters *,
 897					 struct rxrpc_call_params *, gfp_t,
 898					 unsigned int);
 899void rxrpc_start_call_timer(struct rxrpc_call *call);
 900void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
 901			 struct sk_buff *);
 902void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
 903void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 904void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace);
 905struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 906void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 907void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 908void rxrpc_cleanup_call(struct rxrpc_call *);
 909void rxrpc_destroy_all_calls(struct rxrpc_net *);
 910
 911static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
 912{
 913	return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
 914}
 915
 916static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 917{
 918	return !rxrpc_is_service_call(call);
 919}
 920
 921/*
 922 * call_state.c
 923 */
 924bool rxrpc_set_call_completion(struct rxrpc_call *call,
 925			       enum rxrpc_call_completion compl,
 926			       u32 abort_code,
 927			       int error);
 928bool rxrpc_call_completed(struct rxrpc_call *call);
 929bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
 930		      u32 abort_code, int error, enum rxrpc_abort_reason why);
 931void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl,
 932			int error);
 933
 934static inline void rxrpc_set_call_state(struct rxrpc_call *call,
 935					enum rxrpc_call_state state)
 936{
 937	/* Order write of completion info before write of ->state. */
 938	smp_store_release(&call->_state, state);
 939	wake_up(&call->waitq);
 940}
 941
 942static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call)
 943{
 944	return call->_state; /* Only inside I/O thread */
 945}
 946
 947static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call)
 948{
 949	return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
 950}
 951
 952static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call)
 953{
 954	/* Order read ->state before read of completion info. */
 955	return smp_load_acquire(&call->_state);
 956}
 957
 958static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call)
 959{
 960	return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
 961}
 962
 963static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call)
 964{
 965	return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED;
 966}
 967
 968/*
 969 * conn_client.c
 970 */
 971extern unsigned int rxrpc_reap_client_connections;
 972extern unsigned long rxrpc_conn_idle_client_expiry;
 973extern unsigned long rxrpc_conn_idle_client_fast_expiry;
 974
 975void rxrpc_purge_client_connections(struct rxrpc_local *local);
 976struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
 977void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
 978int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp);
 979void rxrpc_connect_client_calls(struct rxrpc_local *local);
 980void rxrpc_expose_client_call(struct rxrpc_call *);
 981void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *);
 982void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle);
 983void rxrpc_put_client_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
 984void rxrpc_discard_expired_client_conns(struct rxrpc_local *local);
 985void rxrpc_clean_up_local_conns(struct rxrpc_local *);
 986
 987/*
 988 * conn_event.c
 989 */
 990void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb,
 991				unsigned int channel);
 992int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb,
 993		     s32 abort_code, int err, enum rxrpc_abort_reason why);
 994void rxrpc_process_connection(struct work_struct *);
 995void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
 996bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb);
 997void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb);
 998
 999static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn)
1000{
1001	/* Order reading the abort info after the state check. */
1002	return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED;
1003}
1004
1005/*
1006 * conn_object.c
1007 */
1008extern unsigned int rxrpc_connection_expiry;
1009extern unsigned int rxrpc_closed_conn_expiry;
1010
1011void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why);
1012struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t);
1013struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *,
1014							  struct sockaddr_rxrpc *,
1015							  struct sk_buff *);
1016void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
1017void rxrpc_disconnect_call(struct rxrpc_call *);
1018void rxrpc_kill_client_conn(struct rxrpc_connection *);
1019void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
1020void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1021struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *,
1022					      enum rxrpc_conn_trace);
1023struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *,
1024						    enum rxrpc_conn_trace);
1025void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1026void rxrpc_service_connection_reaper(struct work_struct *);
1027void rxrpc_destroy_all_connections(struct rxrpc_net *);
1028
1029static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
1030{
1031	return conn->out_clientflag;
1032}
1033
1034static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
1035{
1036	return !rxrpc_conn_is_client(conn);
1037}
1038
1039static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
1040					   unsigned long expire_at)
1041{
1042	timer_reduce(&conn->timer, expire_at);
1043}
1044
1045/*
1046 * conn_service.c
1047 */
1048struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
1049						     struct sk_buff *);
1050struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
1051void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *,
1052				   const struct rxrpc_security *, struct sk_buff *);
1053void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
1054
1055/*
1056 * input.c
1057 */
1058void rxrpc_congestion_degrade(struct rxrpc_call *);
1059void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *);
1060void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *);
1061
1062/*
1063 * io_thread.c
1064 */
1065int rxrpc_encap_rcv(struct sock *, struct sk_buff *);
1066void rxrpc_error_report(struct sock *);
1067bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
1068			s32 abort_code, int err);
1069int rxrpc_io_thread(void *data);
1070static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local)
1071{
1072	wake_up_process(local->io_thread);
1073}
1074
1075static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why)
1076{
1077	return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO);
1078}
1079
1080/*
1081 * insecure.c
1082 */
1083extern const struct rxrpc_security rxrpc_no_security;
1084
1085/*
1086 * key.c
1087 */
1088extern struct key_type key_type_rxrpc;
1089
1090int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int);
1091int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
1092			      u32);
1093
1094/*
1095 * local_event.c
1096 */
1097void rxrpc_gen_version_string(void);
1098void rxrpc_send_version_request(struct rxrpc_local *local,
1099				struct rxrpc_host_header *hdr,
1100				struct sk_buff *skb);
1101
1102/*
1103 * local_object.c
1104 */
1105void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set);
1106struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1107struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace);
1108struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace);
1109void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace);
1110struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace);
1111void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace);
1112void rxrpc_destroy_local(struct rxrpc_local *local);
1113void rxrpc_destroy_all_locals(struct rxrpc_net *);
1114
1115static inline bool __rxrpc_use_local(struct rxrpc_local *local,
1116				     enum rxrpc_local_trace why)
1117{
1118	int r, u;
1119
1120	r = refcount_read(&local->ref);
1121	u = atomic_fetch_add_unless(&local->active_users, 1, 0);
1122	trace_rxrpc_local(local->debug_id, why, r, u);
1123	return u != 0;
1124}
1125
1126static inline void rxrpc_see_local(struct rxrpc_local *local,
1127				   enum rxrpc_local_trace why)
1128{
1129	int r, u;
1130
1131	r = refcount_read(&local->ref);
1132	u = atomic_read(&local->active_users);
1133	trace_rxrpc_local(local->debug_id, why, r, u);
1134}
1135
1136/*
1137 * misc.c
1138 */
1139extern unsigned int rxrpc_max_backlog __read_mostly;
1140extern unsigned long rxrpc_soft_ack_delay;
1141extern unsigned long rxrpc_idle_ack_delay;
1142extern unsigned int rxrpc_rx_window_size;
1143extern unsigned int rxrpc_rx_mtu;
1144extern unsigned int rxrpc_rx_jumbo_max;
1145#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
1146extern unsigned long rxrpc_inject_rx_delay;
1147#endif
1148
1149/*
1150 * net_ns.c
1151 */
1152extern unsigned int rxrpc_net_id;
1153extern struct pernet_operations rxrpc_net_ops;
1154
1155static inline struct rxrpc_net *rxrpc_net(struct net *net)
1156{
1157	return net_generic(net, rxrpc_net_id);
1158}
1159
1160/*
1161 * output.c
1162 */
1163int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
 
1164int rxrpc_send_abort_packet(struct rxrpc_call *);
1165int rxrpc_send_data_packet(struct rxrpc_call *, struct rxrpc_txbuf *);
1166void rxrpc_send_conn_abort(struct rxrpc_connection *conn);
1167void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb);
1168void rxrpc_send_keepalive(struct rxrpc_peer *);
1169void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
1170
1171/*
1172 * peer_event.c
1173 */
1174void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *);
1175void rxrpc_peer_keepalive_worker(struct work_struct *);
1176
1177/*
1178 * peer_object.c
1179 */
1180struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1181					 const struct sockaddr_rxrpc *);
1182struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local,
1183				     struct sockaddr_rxrpc *srx, gfp_t gfp);
1184struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t,
1185				    enum rxrpc_peer_trace);
1186void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer);
1187void rxrpc_destroy_all_peers(struct rxrpc_net *);
1188struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1189struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace);
1190void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1191
1192/*
1193 * proc.c
1194 */
1195extern const struct seq_operations rxrpc_call_seq_ops;
1196extern const struct seq_operations rxrpc_connection_seq_ops;
1197extern const struct seq_operations rxrpc_bundle_seq_ops;
1198extern const struct seq_operations rxrpc_peer_seq_ops;
1199extern const struct seq_operations rxrpc_local_seq_ops;
1200
1201/*
1202 * recvmsg.c
1203 */
1204void rxrpc_notify_socket(struct rxrpc_call *);
1205int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1206
1207/*
1208 * Abort a call due to a protocol error.
1209 */
1210static inline int rxrpc_abort_eproto(struct rxrpc_call *call,
1211				     struct sk_buff *skb,
1212				     s32 abort_code,
1213				     enum rxrpc_abort_reason why)
1214{
1215	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
1216
1217	rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why);
1218	return -EPROTO;
1219}
1220
1221/*
1222 * rtt.c
1223 */
1224void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int,
1225			rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1226unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool);
1227void rxrpc_peer_init_rtt(struct rxrpc_peer *);
1228
1229/*
1230 * rxkad.c
1231 */
1232#ifdef CONFIG_RXKAD
1233extern const struct rxrpc_security rxkad;
1234#endif
1235
1236/*
1237 * security.c
1238 */
1239int __init rxrpc_init_security(void);
1240const struct rxrpc_security *rxrpc_security_lookup(u8);
1241void rxrpc_exit_security(void);
1242int rxrpc_init_client_call_security(struct rxrpc_call *);
1243int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1244const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *,
1245							 struct sk_buff *);
1246struct key *rxrpc_look_up_server_security(struct rxrpc_connection *,
1247					  struct sk_buff *, u32, u32);
1248
1249/*
1250 * sendmsg.c
1251 */
1252bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error,
1253			 enum rxrpc_abort_reason why);
1254int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1255
1256/*
1257 * server_key.c
1258 */
1259extern struct key_type key_type_rxrpc_s;
1260
1261int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int);
1262
1263/*
1264 * skbuff.c
1265 */
1266void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1267void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1268void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1269void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
1270void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1271void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1272void rxrpc_purge_queue(struct sk_buff_head *);
1273
1274/*
1275 * stats.c
1276 */
1277int rxrpc_stats_show(struct seq_file *seq, void *v);
1278int rxrpc_stats_clear(struct file *file, char *buf, size_t size);
1279
1280#define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s)
1281#define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s)
1282
1283/*
1284 * sysctl.c
1285 */
1286#ifdef CONFIG_SYSCTL
1287extern int __init rxrpc_sysctl_init(void);
1288extern void rxrpc_sysctl_exit(void);
1289#else
1290static inline int __init rxrpc_sysctl_init(void) { return 0; }
1291static inline void rxrpc_sysctl_exit(void) {}
1292#endif
1293
1294/*
1295 * txbuf.c
1296 */
1297extern atomic_t rxrpc_nr_txbuf;
1298struct rxrpc_txbuf *rxrpc_alloc_txbuf(struct rxrpc_call *call, u8 packet_type,
1299				      gfp_t gfp);
 
1300void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1301void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1302void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1303
1304/*
1305 * utils.c
1306 */
1307int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1308
1309static inline bool before(u32 seq1, u32 seq2)
1310{
1311        return (s32)(seq1 - seq2) < 0;
1312}
1313static inline bool before_eq(u32 seq1, u32 seq2)
1314{
1315        return (s32)(seq1 - seq2) <= 0;
1316}
1317static inline bool after(u32 seq1, u32 seq2)
1318{
1319        return (s32)(seq1 - seq2) > 0;
1320}
1321static inline bool after_eq(u32 seq1, u32 seq2)
1322{
1323        return (s32)(seq1 - seq2) >= 0;
1324}
1325
1326/*
1327 * debug tracing
1328 */
1329extern unsigned int rxrpc_debug;
1330
1331#define dbgprintk(FMT,...) \
1332	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1333
1334#define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1335#define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1336#define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
1337
1338
1339#if defined(__KDEBUG)
1340#define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
1341#define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
1342#define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
1343
1344#elif defined(CONFIG_AF_RXRPC_DEBUG)
1345#define RXRPC_DEBUG_KENTER	0x01
1346#define RXRPC_DEBUG_KLEAVE	0x02
1347#define RXRPC_DEBUG_KDEBUG	0x04
1348
1349#define _enter(FMT,...)					\
1350do {							\
1351	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER))	\
1352		kenter(FMT,##__VA_ARGS__);		\
1353} while (0)
1354
1355#define _leave(FMT,...)					\
1356do {							\
1357	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE))	\
1358		kleave(FMT,##__VA_ARGS__);		\
1359} while (0)
1360
1361#define _debug(FMT,...)					\
1362do {							\
1363	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG))	\
1364		kdebug(FMT,##__VA_ARGS__);		\
1365} while (0)
1366
1367#else
1368#define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1369#define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1370#define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
1371#endif
1372
1373/*
1374 * debug assertion checking
1375 */
1376#if 1 // defined(__KDEBUGALL)
1377
1378#define ASSERT(X)						\
1379do {								\
1380	if (unlikely(!(X))) {					\
1381		pr_err("Assertion failed\n");			\
1382		BUG();						\
1383	}							\
1384} while (0)
1385
1386#define ASSERTCMP(X, OP, Y)						\
1387do {									\
1388	__typeof__(X) _x = (X);						\
1389	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1390	if (unlikely(!(_x OP _y))) {					\
1391		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1392		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1393		       (unsigned long)_y, (unsigned long)_y);		\
1394		BUG();							\
1395	}								\
1396} while (0)
1397
1398#define ASSERTIF(C, X)						\
1399do {								\
1400	if (unlikely((C) && !(X))) {				\
1401		pr_err("Assertion failed\n");			\
1402		BUG();						\
1403	}							\
1404} while (0)
1405
1406#define ASSERTIFCMP(C, X, OP, Y)					\
1407do {									\
1408	__typeof__(X) _x = (X);						\
1409	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1410	if (unlikely((C) && !(_x OP _y))) {				\
1411		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1412		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1413		       (unsigned long)_y, (unsigned long)_y);		\
1414		BUG();							\
1415	}								\
1416} while (0)
1417
1418#else
1419
1420#define ASSERT(X)				\
1421do {						\
1422} while (0)
1423
1424#define ASSERTCMP(X, OP, Y)			\
1425do {						\
1426} while (0)
1427
1428#define ASSERTIF(C, X)				\
1429do {						\
1430} while (0)
1431
1432#define ASSERTIFCMP(C, X, OP, Y)		\
1433do {						\
1434} while (0)
1435
1436#endif /* __KDEBUGALL */