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	union {
 202		struct rxrpc_connection *conn;	/* Connection referred to (poke packet) */
 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			rxrpc_seq_t	prev_ack;	/* Highest seq seen */
 212			rxrpc_serial_t	acked_serial;	/* Packet in response to (or 0) */
 213			u8		reason;		/* Reason for ack */
 214			u8		nr_acks;	/* Number of acks+nacks */
 215			u8		nr_nacks;	/* Number of nacks */
 216		} ack;
 217	};
 218	struct rxrpc_host_header hdr;	/* RxRPC packet header from this packet */
 
 219};
 220
 221#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 222
 
 
 
 
 
 
 
 223/*
 224 * RxRPC security module interface
 225 */
 226struct rxrpc_security {
 
 
 227	const char		*name;		/* name of this service */
 228	u8			security_index;	/* security type provided */
 229	u32			no_key_abort;	/* Abort code indicating no key */
 230
 231	/* Initialise a security service */
 232	int (*init)(void);
 233
 234	/* Clean up a security service */
 235	void (*exit)(void);
 236
 237	/* Parse the information from a server key */
 238	int (*preparse_server_key)(struct key_preparsed_payload *);
 239
 240	/* Clean up the preparse buffer after parsing a server key */
 241	void (*free_preparse_server_key)(struct key_preparsed_payload *);
 242
 243	/* Destroy the payload of a server key */
 244	void (*destroy_server_key)(struct key *);
 245
 246	/* Describe a server key */
 247	void (*describe_server_key)(const struct key *, struct seq_file *);
 248
 249	/* initialise a connection's security */
 250	int (*init_connection_security)(struct rxrpc_connection *,
 251					struct rxrpc_key_token *);
 252
 253	/* Work out how much data we can store in a packet, given an estimate
 254	 * of the amount of data remaining and allocate a data buffer.
 255	 */
 256	struct rxrpc_txbuf *(*alloc_txbuf)(struct rxrpc_call *call, size_t remaining, gfp_t gfp);
 257
 258	/* impose security on a packet */
 259	int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *);
 
 
 
 260
 261	/* verify the security on a received packet */
 262	int (*verify_packet)(struct rxrpc_call *, struct sk_buff *);
 263
 264	/* Free crypto request on a call */
 265	void (*free_call_crypto)(struct rxrpc_call *);
 266
 267	/* issue a challenge */
 268	int (*issue_challenge)(struct rxrpc_connection *);
 269
 270	/* respond to a challenge */
 271	int (*respond_to_challenge)(struct rxrpc_connection *,
 272				    struct sk_buff *);
 
 273
 274	/* verify a response */
 275	int (*verify_response)(struct rxrpc_connection *,
 276			       struct sk_buff *);
 
 277
 278	/* clear connection security */
 279	void (*clear)(struct rxrpc_connection *);
 280};
 281
 282/*
 283 * RxRPC local transport endpoint description
 284 * - owned by a single AF_RXRPC socket
 285 * - pointed to by transport socket struct sk_user_data
 286 */
 287struct rxrpc_local {
 288	struct rcu_head		rcu;
 289	atomic_t		active_users;	/* Number of users of the local endpoint */
 290	refcount_t		ref;		/* Number of references to the structure */
 291	struct net		*net;		/* The network namespace */
 292	struct rxrpc_net	*rxnet;		/* Our bits in the network namespace */
 293	struct hlist_node	link;
 294	struct socket		*socket;	/* my UDP socket */
 295	struct task_struct	*io_thread;
 296	struct completion	io_thread_ready; /* Indication that the I/O thread started */
 297	struct page_frag_cache	tx_alloc;	/* Tx control packet allocation (I/O thread only) */
 298	struct rxrpc_sock	*service;	/* Service(s) listening on this endpoint */
 299#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
 300	struct sk_buff_head	rx_delay_queue;	/* Delay injection queue */
 301#endif
 302	struct sk_buff_head	rx_queue;	/* Received packets */
 303	struct list_head	conn_attend_q;	/* Conns requiring immediate attention */
 304	struct list_head	call_attend_q;	/* Calls requiring immediate attention */
 305
 306	struct rb_root		client_bundles;	/* Client connection bundles by socket params */
 307	spinlock_t		client_bundles_lock; /* Lock for client_bundles */
 308	bool			kill_all_client_conns;
 309	struct list_head	idle_client_conns;
 310	struct timer_list	client_conn_reap_timer;
 311	unsigned long		client_conn_flags;
 312#define RXRPC_CLIENT_CONN_REAP_TIMER	0	/* The client conn reap timer expired */
 313
 314	spinlock_t		lock;		/* access lock */
 315	rwlock_t		services_lock;	/* lock for services list */
 
 316	int			debug_id;	/* debug ID for printks */
 317	bool			dead;
 318	bool			service_closed;	/* Service socket closed */
 319	struct idr		conn_ids;	/* List of connection IDs */
 320	struct list_head	new_client_calls; /* Newly created client calls need connection */
 321	spinlock_t		client_call_lock; /* Lock for ->new_client_calls */
 322	struct sockaddr_rxrpc	srx;		/* local address */
 323};
 324
 325/*
 326 * RxRPC remote transport endpoint definition
 327 * - matched by local endpoint, remote port, address and protocol type
 
 328 */
 329struct rxrpc_peer {
 330	struct rcu_head		rcu;		/* This must be first */
 331	refcount_t		ref;
 332	unsigned long		hash_key;
 333	struct hlist_node	hash_link;
 334	struct rxrpc_local	*local;
 335	struct hlist_head	error_targets;	/* targets for net error distribution */
 336	struct rb_root		service_conns;	/* Service connections */
 337	struct list_head	keepalive_link;	/* Link in net->peer_keepalive[] */
 338	time64_t		last_tx_at;	/* Last time packet sent here */
 339	seqlock_t		service_conn_lock;
 340	spinlock_t		lock;		/* access lock */
 
 341	unsigned int		if_mtu;		/* interface MTU for this peer */
 342	unsigned int		mtu;		/* network MTU for this peer */
 343	unsigned int		maxdata;	/* data size (MTU - hdrsize) */
 344	unsigned short		hdrsize;	/* header size (IP + UDP + RxRPC) */
 345	int			debug_id;	/* debug ID for printks */
 
 346	struct sockaddr_rxrpc	srx;		/* remote address */
 347
 348	/* calculated RTT cache */
 349#define RXRPC_RTT_CACHE_SIZE 32
 350	spinlock_t		rtt_input_lock;	/* RTT lock for input routine */
 351	ktime_t			rtt_last_req;	/* Time of last RTT request */
 352	unsigned int		rtt_count;	/* Number of samples we've got */
 353
 354	u32			srtt_us;	/* smoothed round trip time << 3 in usecs */
 355	u32			mdev_us;	/* medium deviation			*/
 356	u32			mdev_max_us;	/* maximal mdev for the last rtt period	*/
 357	u32			rttvar_us;	/* smoothed mdev_max			*/
 358	u32			rto_us;		/* Retransmission timeout in usec */
 359	u8			backoff;	/* Backoff timeout (as shift) */
 360
 361	u8			cong_ssthresh;	/* Congestion slow-start threshold */
 362};
 363
 364/*
 365 * Keys for matching a connection.
 366 */
 367struct rxrpc_conn_proto {
 368	union {
 369		struct {
 370			u32	epoch;		/* epoch of this connection */
 371			u32	cid;		/* connection ID */
 372		};
 373		u64		index_key;
 374	};
 375};
 376
 377struct rxrpc_conn_parameters {
 378	struct rxrpc_local	*local;		/* Representation of local endpoint */
 379	struct rxrpc_peer	*peer;		/* Representation of remote endpoint */
 380	struct key		*key;		/* Security details */
 381	bool			exclusive;	/* T if conn is exclusive */
 382	bool			upgrade;	/* T if service ID can be upgraded */
 383	u16			service_id;	/* Service ID for this connection */
 384	u32			security_level;	/* Security level selected */
 385};
 386
 387/*
 388 * Call completion condition (state == RXRPC_CALL_COMPLETE).
 389 */
 390enum rxrpc_call_completion {
 391	RXRPC_CALL_SUCCEEDED,		/* - Normal termination */
 392	RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
 393	RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
 394	RXRPC_CALL_LOCAL_ERROR,		/* - call failed due to local error */
 395	RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
 396	NR__RXRPC_CALL_COMPLETIONS
 397};
 398
 399/*
 400 * Bits in the connection flags.
 401 */
 402enum rxrpc_conn_flag {
 403	RXRPC_CONN_IN_SERVICE_CONNS,	/* Conn is in peer->service_conns */
 404	RXRPC_CONN_DONT_REUSE,		/* Don't reuse this connection */
 405	RXRPC_CONN_PROBING_FOR_UPGRADE,	/* Probing for service upgrade */
 406	RXRPC_CONN_FINAL_ACK_0,		/* Need final ACK for channel 0 */
 407	RXRPC_CONN_FINAL_ACK_1,		/* Need final ACK for channel 1 */
 408	RXRPC_CONN_FINAL_ACK_2,		/* Need final ACK for channel 2 */
 409	RXRPC_CONN_FINAL_ACK_3,		/* Need final ACK for channel 3 */
 410};
 411
 412#define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |	\
 413				   (1UL << RXRPC_CONN_FINAL_ACK_1) |	\
 414				   (1UL << RXRPC_CONN_FINAL_ACK_2) |	\
 415				   (1UL << RXRPC_CONN_FINAL_ACK_3))
 416
 417/*
 418 * Events that can be raised upon a connection.
 419 */
 420enum rxrpc_conn_event {
 421	RXRPC_CONN_EV_CHALLENGE,	/* Send challenge packet */
 422	RXRPC_CONN_EV_ABORT_CALLS,	/* Abort attached calls */
 423};
 424
 425/*
 426 * The connection protocol state.
 427 */
 428enum rxrpc_conn_proto_state {
 429	RXRPC_CONN_UNUSED,		/* Connection not yet attempted */
 430	RXRPC_CONN_CLIENT_UNSECURED,	/* Client connection needs security init */
 431	RXRPC_CONN_CLIENT,		/* Client connection */
 432	RXRPC_CONN_SERVICE_PREALLOC,	/* Service connection preallocation */
 433	RXRPC_CONN_SERVICE_UNSECURED,	/* Service unsecured connection */
 434	RXRPC_CONN_SERVICE_CHALLENGING,	/* Service challenging for security */
 435	RXRPC_CONN_SERVICE,		/* Service secured connection */
 436	RXRPC_CONN_ABORTED,		/* Conn aborted */
 437	RXRPC_CONN__NR_STATES
 438};
 439
 440/*
 441 * RxRPC client connection bundle.
 
 442 */
 443struct rxrpc_bundle {
 444	struct rxrpc_local	*local;		/* Representation of local endpoint */
 445	struct rxrpc_peer	*peer;		/* Remote endpoint */
 446	struct key		*key;		/* Security details */
 447	struct list_head	proc_link;	/* Link in net->bundle_proc_list */
 448	const struct rxrpc_security *security;	/* applied security module */
 449	refcount_t		ref;
 450	atomic_t		active;		/* Number of active users */
 451	unsigned int		debug_id;
 452	u32			security_level;	/* Security level selected */
 453	u16			service_id;	/* Service ID for this connection */
 454	bool			try_upgrade;	/* True if the bundle is attempting upgrade */
 455	bool			exclusive;	/* T if conn is exclusive */
 456	bool			upgrade;	/* T if service ID can be upgraded */
 457	unsigned short		alloc_error;	/* Error from last conn allocation */
 458	struct rb_node		local_node;	/* Node in local->client_conns */
 459	struct list_head	waiting_calls;	/* Calls waiting for channels */
 460	unsigned long		avail_chans;	/* Mask of available channels */
 461	unsigned int		conn_ids[4];	/* Connection IDs. */
 462	struct rxrpc_connection	*conns[4];	/* The connections in the bundle (max 4) */
 463};
 464
 465/*
 466 * RxRPC connection definition
 467 * - matched by { local, peer, epoch, conn_id, direction }
 468 * - each connection can only handle four simultaneous calls
 469 */
 470struct rxrpc_connection {
 471	struct rxrpc_conn_proto	proto;
 472	struct rxrpc_local	*local;		/* Representation of local endpoint */
 473	struct rxrpc_peer	*peer;		/* Remote endpoint */
 474	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
 475	struct key		*key;		/* Security details */
 476	struct list_head	attend_link;	/* Link in local->conn_attend_q */
 477
 478	refcount_t		ref;
 479	atomic_t		active;		/* Active count for service conns */
 480	struct rcu_head		rcu;
 481	struct list_head	cache_link;
 482
 483	unsigned char		act_chans;	/* Mask of active channels */
 484	struct rxrpc_channel {
 485		unsigned long		final_ack_at;	/* Time at which to issue final ACK */
 486		struct rxrpc_call	*call;		/* Active call */
 487		unsigned int		call_debug_id;	/* call->debug_id */
 488		u32			call_id;	/* ID of current call */
 489		u32			call_counter;	/* Call ID counter */
 490		u32			last_call;	/* ID of last call */
 491		u8			last_type;	/* Type of last packet */
 492		union {
 493			u32		last_seq;
 494			u32		last_abort;
 495		};
 496	} channels[RXRPC_MAXCALLS];
 497
 498	struct timer_list	timer;		/* Conn event timer */
 499	struct work_struct	processor;	/* connection event processor */
 500	struct work_struct	destructor;	/* In-process-context destroyer */
 501	struct rxrpc_bundle	*bundle;	/* Client connection bundle */
 502	struct rb_node		service_node;	/* Node in peer->service_conns */
 503	struct list_head	proc_link;	/* link in procfs list */
 504	struct list_head	link;		/* link in master connection list */
 
 
 505	struct sk_buff_head	rx_queue;	/* received conn-level packets */
 506	struct page_frag_cache	tx_data_alloc;	/* Tx DATA packet allocation */
 507	struct mutex		tx_data_alloc_lock;
 508
 509	struct mutex		security_lock;	/* Lock for security management */
 510	const struct rxrpc_security *security;	/* applied security module */
 511	union {
 512		struct {
 513			struct crypto_sync_skcipher *cipher;	/* encryption handle */
 514			struct rxrpc_crypt csum_iv;	/* packet checksum base */
 515			u32	nonce;		/* response re-use preventer */
 516		} rxkad;
 517	};
 518	unsigned long		flags;
 519	unsigned long		events;
 520	unsigned long		idle_timestamp;	/* Time at which last became idle */
 
 
 521	spinlock_t		state_lock;	/* state-change lock */
 522	enum rxrpc_conn_proto_state state;	/* current state of connection */
 523	enum rxrpc_call_completion completion;	/* Completion condition */
 524	s32			abort_code;	/* Abort code of connection abort */
 
 
 
 
 
 
 
 
 
 525	int			debug_id;	/* debug ID for printks */
 526	rxrpc_serial_t		tx_serial;	/* Outgoing packet serial number counter */
 527	unsigned int		hi_serial;	/* highest serial number received */
 528	u32			service_id;	/* Service ID, possibly upgraded */
 529	u32			security_level;	/* Security level selected */
 
 
 
 
 
 
 
 
 530	u8			security_ix;	/* security type */
 
 531	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
 532	u8			bundle_shift;	/* Index into bundle->avail_chans */
 533	bool			exclusive;	/* T if conn is exclusive */
 534	bool			upgrade;	/* T if service ID can be upgraded */
 535	u16			orig_service_id; /* Originally requested service ID */
 536	short			error;		/* Local error code */
 537};
 538
 539static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
 540{
 541	return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
 542}
 543
 544static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
 545{
 546	return !rxrpc_to_server(sp);
 547}
 548
 549/*
 550 * Flags in call->flags.
 551 */
 552enum rxrpc_call_flag {
 553	RXRPC_CALL_RELEASED,		/* call has been released - no more message to userspace */
 
 
 
 
 
 
 554	RXRPC_CALL_HAS_USERID,		/* has a user ID attached */
 555	RXRPC_CALL_IS_SERVICE,		/* Call is service call */
 556	RXRPC_CALL_EXPOSED,		/* The call was exposed to the world */
 557	RXRPC_CALL_RX_LAST,		/* Received the last packet (at rxtx_top) */
 558	RXRPC_CALL_TX_LAST,		/* Last packet in Tx buffer (at rxtx_top) */
 559	RXRPC_CALL_TX_ALL_ACKED,	/* Last packet has been hard-acked */
 560	RXRPC_CALL_SEND_PING,		/* A ping will need to be sent */
 561	RXRPC_CALL_RETRANS_TIMEOUT,	/* Retransmission due to timeout occurred */
 562	RXRPC_CALL_BEGAN_RX_TIMER,	/* We began the expect_rx_by timer */
 563	RXRPC_CALL_RX_HEARD,		/* The peer responded at least once to this call */
 564	RXRPC_CALL_DISCONNECTED,	/* The call has been disconnected */
 565	RXRPC_CALL_KERNEL,		/* The call was made by the kernel */
 566	RXRPC_CALL_UPGRADE,		/* Service upgrade was requested for the call */
 567	RXRPC_CALL_EXCLUSIVE,		/* The call uses a once-only connection */
 568	RXRPC_CALL_RX_IS_IDLE,		/* recvmsg() is idle - send an ACK */
 569	RXRPC_CALL_RECVMSG_READ_ALL,	/* recvmsg() read all of the received data */
 570	RXRPC_CALL_CONN_CHALLENGING,	/* The connection is being challenged */
 571};
 572
 573/*
 574 * Events that can be raised on a call.
 575 */
 576enum rxrpc_call_event {
 577	RXRPC_CALL_EV_ACK_LOST,		/* ACK may be lost, send ping */
 578	RXRPC_CALL_EV_INITIAL_PING,	/* Send initial ping for a new service call */
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 579};
 580
 581/*
 582 * The states that a call can be in.
 583 */
 584enum rxrpc_call_state {
 585	RXRPC_CALL_UNINITIALISED,
 586	RXRPC_CALL_CLIENT_AWAIT_CONN,	/* - client waiting for connection to become available */
 587	RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
 588	RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
 589	RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
 590	RXRPC_CALL_SERVER_PREALLOC,	/* - service preallocation */
 
 
 591	RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
 592	RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
 593	RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
 594	RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
 595	RXRPC_CALL_COMPLETE,		/* - call complete */
 
 
 
 
 
 596	NR__RXRPC_CALL_STATES
 597};
 598
 599/*
 600 * Call Tx congestion management modes.
 601 */
 602enum rxrpc_congest_mode {
 603	RXRPC_CALL_SLOW_START,
 604	RXRPC_CALL_CONGEST_AVOIDANCE,
 605	RXRPC_CALL_PACKET_LOSS,
 606	RXRPC_CALL_FAST_RETRANSMIT,
 607	NR__RXRPC_CONGEST_MODES
 608};
 609
 610/*
 611 * RxRPC call definition
 612 * - matched by { connection, call_id }
 613 */
 614struct rxrpc_call {
 615	struct rcu_head		rcu;
 616	struct rxrpc_connection	*conn;		/* connection carrying call */
 617	struct rxrpc_bundle	*bundle;	/* Connection bundle to use */
 618	struct rxrpc_peer	*peer;		/* Peer record for remote address */
 619	struct rxrpc_local	*local;		/* Representation of local endpoint */
 620	struct rxrpc_sock __rcu	*socket;	/* socket responsible */
 621	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
 622	struct key		*key;		/* Security details */
 623	const struct rxrpc_security *security;	/* applied security module */
 624	struct mutex		user_mutex;	/* User access mutex */
 625	struct sockaddr_rxrpc	dest_srx;	/* Destination address */
 626	ktime_t			delay_ack_at;	/* When DELAY ACK needs to happen */
 627	ktime_t			ack_lost_at;	/* When ACK is figured as lost */
 628	ktime_t			resend_at;	/* When next resend needs to happen */
 629	ktime_t			ping_at;	/* When next to send a ping */
 630	ktime_t			keepalive_at;	/* When next to send a keepalive ping */
 631	ktime_t			expect_rx_by;	/* When we expect to get a packet by */
 632	ktime_t			expect_req_by;	/* When we expect to get a request DATA packet by */
 633	ktime_t			expect_term_by;	/* When we expect call termination by */
 634	u32			next_rx_timo;	/* Timeout for next Rx packet (ms) */
 635	u32			next_req_timo;	/* Timeout for next Rx request packet (ms) */
 636	u32			hard_timo;	/* Maximum lifetime or 0 (s) */
 637	struct timer_list	timer;		/* Combined event timer */
 638	struct work_struct	destroyer;	/* In-process-context destroyer */
 639	rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
 640	struct list_head	link;		/* link in master call list */
 641	struct list_head	wait_link;	/* Link in local->new_client_calls */
 642	struct hlist_node	error_link;	/* link in error distribution list */
 643	struct list_head	accept_link;	/* Link in rx->acceptq */
 644	struct list_head	recvmsg_link;	/* Link in rx->recvmsg_q */
 645	struct list_head	sock_link;	/* Link in rx->sock_calls */
 646	struct rb_node		sock_node;	/* Node in rx->calls */
 647	struct list_head	attend_link;	/* Link in local->call_attend_q */
 648	struct rxrpc_txbuf	*tx_pending;	/* Tx buffer being filled */
 649	wait_queue_head_t	waitq;		/* Wait queue for channel or Tx */
 650	s64			tx_total_len;	/* Total length left to be transmitted (or -1) */
 651	unsigned long		user_call_ID;	/* user-defined call ID */
 
 652	unsigned long		flags;
 653	unsigned long		events;
 654	spinlock_t		notify_lock;	/* Kernel notification lock */
 655	unsigned int		send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */
 656	s32			send_abort;	/* Abort code to be sent */
 657	short			send_abort_err;	/* Error to be associated with the abort */
 658	rxrpc_seq_t		send_abort_seq;	/* DATA packet that incurred the abort (or 0) */
 659	s32			abort_code;	/* Local/remote abort code */
 660	int			error;		/* Local error incurred */
 661	enum rxrpc_call_state	_state;		/* Current state of call (needs barrier) */
 662	enum rxrpc_call_completion completion;	/* Call completion condition */
 663	refcount_t		ref;
 664	u8			security_ix;	/* Security type */
 665	enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */
 666	u32			call_id;	/* call ID on connection  */
 667	u32			cid;		/* connection ID plus channel index */
 668	u32			security_level;	/* Security level selected */
 669	int			debug_id;	/* debug ID for printks */
 670	unsigned short		rx_pkt_offset;	/* Current recvmsg packet offset */
 671	unsigned short		rx_pkt_len;	/* Current recvmsg packet len */
 672
 673	/* Transmitted data tracking. */
 674	spinlock_t		tx_lock;	/* Transmit queue lock */
 675	struct list_head	tx_sendmsg;	/* Sendmsg prepared packets */
 676	struct list_head	tx_buffer;	/* Buffer of transmissible packets */
 677	rxrpc_seq_t		tx_bottom;	/* First packet in buffer */
 678	rxrpc_seq_t		tx_transmitted;	/* Highest packet transmitted */
 679	rxrpc_seq_t		tx_prepared;	/* Highest Tx slot prepared. */
 680	rxrpc_seq_t		tx_top;		/* Highest Tx slot allocated. */
 681	u16			tx_backoff;	/* Delay to insert due to Tx failure (ms) */
 682	u8			tx_winsize;	/* Maximum size of Tx window */
 683#define RXRPC_TX_MAX_WINDOW	128
 684	ktime_t			tx_last_sent;	/* Last time a transmission occurred */
 685
 686	/* Received data tracking */
 687	struct sk_buff_head	recvmsg_queue;	/* Queue of packets ready for recvmsg() */
 688	struct sk_buff_head	rx_oos_queue;	/* Queue of out of sequence packets */
 689
 690	rxrpc_seq_t		rx_highest_seq;	/* Higest sequence number received */
 691	rxrpc_seq_t		rx_consumed;	/* Highest packet consumed */
 692	rxrpc_serial_t		rx_serial;	/* Highest serial received for this call */
 693	u8			rx_winsize;	/* Size of Rx window */
 694
 695	/* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 696	 * is fixed, we keep these numbers in terms of segments (ie. DATA
 697	 * packets) rather than bytes.
 698	 */
 699#define RXRPC_TX_SMSS		RXRPC_JUMBO_DATALEN
 700#define RXRPC_MIN_CWND		4
 701	u8			cong_cwnd;	/* Congestion window size */
 702	u8			cong_extra;	/* Extra to send for congestion management */
 703	u8			cong_ssthresh;	/* Slow-start threshold */
 704	enum rxrpc_congest_mode	cong_mode:8;	/* Congestion management mode */
 705	u8			cong_dup_acks;	/* Count of ACKs showing missing packets */
 706	u8			cong_cumul_acks; /* Cumulative ACK count */
 707	ktime_t			cong_tstamp;	/* Last time cwnd was changed */
 708	struct sk_buff		*cong_last_nack; /* Last ACK with nacks received */
 709
 710	/* Receive-phase ACK management (ACKs we send). */
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 711	u8			ackr_reason;	/* reason to ACK */
 712	u16			ackr_sack_base;	/* Starting slot in SACK table ring */
 713	rxrpc_seq_t		ackr_window;	/* Base of SACK window */
 714	rxrpc_seq_t		ackr_wtop;	/* Base of SACK window */
 715	unsigned int		ackr_nr_unacked; /* Number of unacked packets */
 716	atomic_t		ackr_nr_consumed; /* Number of packets needing hard ACK */
 717	struct {
 718#define RXRPC_SACK_SIZE 256
 719		 /* SACK table for soft-acked packets */
 720		u8		ackr_sack_table[RXRPC_SACK_SIZE];
 721	} __aligned(8);
 722
 723	/* RTT management */
 724	rxrpc_serial_t		rtt_serial[4];	/* Serial number of DATA or PING sent */
 725	ktime_t			rtt_sent_at[4];	/* Time packet sent */
 726	unsigned long		rtt_avail;	/* Mask of available slots in bits 0-3,
 727						 * Mask of pending samples in 8-11 */
 728#define RXRPC_CALL_RTT_AVAIL_MASK	0xf
 729#define RXRPC_CALL_RTT_PEND_SHIFT	8
 730
 731	/* Transmission-phase ACK management (ACKs we've received). */
 732	ktime_t			acks_latest_ts;	/* Timestamp of latest ACK received */
 733	rxrpc_seq_t		acks_first_seq;	/* first sequence number received */
 734	rxrpc_seq_t		acks_prev_seq;	/* Highest previousPacket received */
 735	rxrpc_seq_t		acks_hard_ack;	/* Latest hard-ack point */
 736	rxrpc_seq_t		acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 737	rxrpc_serial_t		acks_highest_serial; /* Highest serial number ACK'd */
 738};
 739
 740/*
 741 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 742 */
 743struct rxrpc_ack_summary {
 744	u16			nr_acks;		/* Number of ACKs in packet */
 745	u16			nr_new_acks;		/* Number of new ACKs in packet */
 746	u16			nr_new_nacks;		/* Number of new nacks in packet */
 747	u16			nr_retained_nacks;	/* Number of nacks retained between ACKs */
 748	u8			ack_reason;
 749	bool			saw_nacks;		/* Saw NACKs in packet */
 750	bool			new_low_nack;		/* T if new low NACK found */
 751	bool			retrans_timeo;		/* T if reTx due to timeout happened */
 752	u8			flight_size;		/* Number of unreceived transmissions */
 753	/* Place to stash values for tracing */
 754	enum rxrpc_congest_mode	mode:8;
 755	u8			cwnd;
 756	u8			ssthresh;
 757	u8			dup_acks;
 758	u8			cumulative_acks;
 759};
 760
 761/*
 762 * sendmsg() cmsg-specified parameters.
 763 */
 764enum rxrpc_command {
 765	RXRPC_CMD_SEND_DATA,		/* send data message */
 766	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
 767	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
 768	RXRPC_CMD_CHARGE_ACCEPT,	/* [server] charge accept preallocation */
 769};
 770
 771struct rxrpc_call_params {
 772	s64			tx_total_len;	/* Total Tx data length (if send data) */
 773	unsigned long		user_call_ID;	/* User's call ID */
 774	struct {
 775		u32		hard;		/* Maximum lifetime (sec) */
 776		u32		idle;		/* Max time since last data packet (msec) */
 777		u32		normal;		/* Max time since last call packet (msec) */
 778	} timeouts;
 779	u8			nr_timeouts;	/* Number of timeouts specified */
 780	bool			kernel;		/* T if kernel is making the call */
 781	enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */
 782};
 783
 784struct rxrpc_send_params {
 785	struct rxrpc_call_params call;
 786	u32			abort_code;	/* Abort code to Tx (if abort) */
 787	enum rxrpc_command	command : 8;	/* The command to implement */
 788	bool			exclusive;	/* Shared or exclusive call */
 789	bool			upgrade;	/* If the connection is upgradeable */
 790};
 791
 792/*
 793 * Buffer of data to be output as a packet.
 794 */
 795struct rxrpc_txbuf {
 796	struct list_head	call_link;	/* Link in call->tx_sendmsg/tx_buffer */
 797	struct list_head	tx_link;	/* Link in live Enc queue or Tx queue */
 798	ktime_t			last_sent;	/* Time at which last transmitted */
 799	refcount_t		ref;
 800	rxrpc_seq_t		seq;		/* Sequence number of this packet */
 801	rxrpc_serial_t		serial;		/* Last serial number transmitted with */
 802	unsigned int		call_debug_id;
 803	unsigned int		debug_id;
 804	unsigned int		len;		/* Amount of data in buffer */
 805	unsigned int		space;		/* Remaining data space */
 806	unsigned int		offset;		/* Offset of fill point */
 807	unsigned int		flags;
 808#define RXRPC_TXBUF_WIRE_FLAGS	0xff		/* The wire protocol flags */
 809#define RXRPC_TXBUF_RESENT	0x100		/* Set if has been resent */
 810	__be16			cksum;		/* Checksum to go in header */
 811	unsigned short		ack_rwind;	/* ACK receive window */
 812	u8 /*enum rxrpc_propose_ack_trace*/ ack_why;	/* If ack, why */
 813	u8			nr_kvec;	/* Amount of kvec[] used */
 814	struct kvec		kvec[3];
 815};
 816
 817static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb)
 818{
 819	return txb->flags & RXRPC_CLIENT_INITIATED;
 820}
 821
 822static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb)
 823{
 824	return !rxrpc_sending_to_server(txb);
 825}
 826
 827#include <trace/events/rxrpc.h>
 828
 829/*
 830 * Allocate the next serial number on a connection.  0 must be skipped.
 831 */
 832static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn)
 833{
 834	rxrpc_serial_t serial;
 835
 836	serial = conn->tx_serial;
 837	if (serial == 0)
 838		serial = 1;
 839	conn->tx_serial = serial + 1;
 840	return serial;
 841}
 842
 843/*
 844 * af_rxrpc.c
 845 */
 846extern atomic_t rxrpc_n_rx_skbs;
 
 
 847extern struct workqueue_struct *rxrpc_workqueue;
 848
 849/*
 850 * call_accept.c
 851 */
 852int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 853void rxrpc_discard_prealloc(struct rxrpc_sock *);
 854bool rxrpc_new_incoming_call(struct rxrpc_local *local,
 855			     struct rxrpc_peer *peer,
 856			     struct rxrpc_connection *conn,
 857			     struct sockaddr_rxrpc *peer_srx,
 858			     struct sk_buff *skb);
 859int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long);
 860
 861/*
 862 * call_event.c
 863 */
 864void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial,
 865			enum rxrpc_propose_ack_trace why);
 866void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t,
 867			     enum rxrpc_propose_ack_trace);
 868void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *);
 869void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb);
 870
 871bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb);
 
 
 872
 873/*
 874 * call_object.c
 875 */
 876extern const char *const rxrpc_call_states[];
 877extern const char *const rxrpc_call_completions[];
 878extern struct kmem_cache *rxrpc_call_jar;
 
 
 879
 880void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what);
 881struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 882struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
 883struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 884					 struct rxrpc_conn_parameters *,
 885					 struct rxrpc_call_params *, gfp_t,
 886					 unsigned int);
 887void rxrpc_start_call_timer(struct rxrpc_call *call);
 888void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
 889			 struct sk_buff *);
 890void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
 891void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 892void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace);
 893struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 894void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 895void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 896void rxrpc_cleanup_call(struct rxrpc_call *);
 897void rxrpc_destroy_all_calls(struct rxrpc_net *);
 898
 899static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
 900{
 901	return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
 902}
 903
 904static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 905{
 906	return !rxrpc_is_service_call(call);
 907}
 908
 909/*
 910 * call_state.c
 911 */
 912bool rxrpc_set_call_completion(struct rxrpc_call *call,
 913			       enum rxrpc_call_completion compl,
 914			       u32 abort_code,
 915			       int error);
 916bool rxrpc_call_completed(struct rxrpc_call *call);
 917bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
 918		      u32 abort_code, int error, enum rxrpc_abort_reason why);
 919void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl,
 920			int error);
 921
 922static inline void rxrpc_set_call_state(struct rxrpc_call *call,
 923					enum rxrpc_call_state state)
 924{
 925	/* Order write of completion info before write of ->state. */
 926	smp_store_release(&call->_state, state);
 927	wake_up(&call->waitq);
 928}
 929
 930static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call)
 931{
 932	return call->_state; /* Only inside I/O thread */
 933}
 934
 935static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call)
 936{
 937	return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
 938}
 939
 940static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call)
 941{
 942	/* Order read ->state before read of completion info. */
 943	return smp_load_acquire(&call->_state);
 944}
 945
 946static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call)
 947{
 948	return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
 949}
 950
 951static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call)
 952{
 953	return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED;
 954}
 
 
 
 
 955
 956/*
 957 * conn_client.c
 958 */
 959extern unsigned int rxrpc_reap_client_connections;
 960extern unsigned long rxrpc_conn_idle_client_expiry;
 961extern unsigned long rxrpc_conn_idle_client_fast_expiry;
 962
 963void rxrpc_purge_client_connections(struct rxrpc_local *local);
 964struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
 965void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
 966int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp);
 967void rxrpc_connect_client_calls(struct rxrpc_local *local);
 968void rxrpc_expose_client_call(struct rxrpc_call *);
 969void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *);
 970void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle);
 971void rxrpc_discard_expired_client_conns(struct rxrpc_local *local);
 972void rxrpc_clean_up_local_conns(struct rxrpc_local *);
 973
 974/*
 975 * conn_event.c
 976 */
 977void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb,
 978				unsigned int channel);
 979int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb,
 980		     s32 abort_code, int err, enum rxrpc_abort_reason why);
 981void rxrpc_process_connection(struct work_struct *);
 982void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
 983bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb);
 984void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb);
 985
 986static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn)
 987{
 988	/* Order reading the abort info after the state check. */
 989	return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED;
 990}
 991
 992/*
 993 * conn_object.c
 994 */
 995extern unsigned int rxrpc_connection_expiry;
 996extern unsigned int rxrpc_closed_conn_expiry;
 997
 998void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why);
 999struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t);
1000struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *,
1001							  struct sockaddr_rxrpc *,
1002							  struct sk_buff *);
1003void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
1004void rxrpc_disconnect_call(struct rxrpc_call *);
1005void rxrpc_kill_client_conn(struct rxrpc_connection *);
1006void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
1007void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1008struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *,
1009					      enum rxrpc_conn_trace);
1010struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *,
1011						    enum rxrpc_conn_trace);
1012void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1013void rxrpc_service_connection_reaper(struct work_struct *);
1014void rxrpc_destroy_all_connections(struct rxrpc_net *);
1015
1016static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
1017{
1018	return conn->out_clientflag;
1019}
1020
1021static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
1022{
1023	return !rxrpc_conn_is_client(conn);
1024}
1025
1026static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
1027					   unsigned long expire_at)
1028{
1029	timer_reduce(&conn->timer, expire_at);
1030}
1031
1032/*
1033 * conn_service.c
1034 */
1035struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
1036						     struct sk_buff *);
1037struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
1038void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *,
1039				   const struct rxrpc_security *, struct sk_buff *);
1040void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
1041
1042/*
1043 * input.c
1044 */
1045void rxrpc_congestion_degrade(struct rxrpc_call *);
1046void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *);
1047void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *);
1048
1049/*
1050 * io_thread.c
1051 */
1052int rxrpc_encap_rcv(struct sock *, struct sk_buff *);
1053void rxrpc_error_report(struct sock *);
1054bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
1055			s32 abort_code, int err);
1056int rxrpc_io_thread(void *data);
1057static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local)
1058{
1059	wake_up_process(READ_ONCE(local->io_thread));
1060}
1061
1062static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why)
1063{
1064	return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO);
1065}
1066
1067/*
1068 * insecure.c
1069 */
1070extern const struct rxrpc_security rxrpc_no_security;
1071
1072/*
1073 * key.c
1074 */
1075extern struct key_type key_type_rxrpc;
 
1076
1077int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int);
1078int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
 
1079			      u32);
1080
1081/*
1082 * local_event.c
1083 */
1084void rxrpc_gen_version_string(void);
1085void rxrpc_send_version_request(struct rxrpc_local *local,
1086				struct rxrpc_host_header *hdr,
1087				struct sk_buff *skb);
1088
1089/*
1090 * local_object.c
1091 */
1092void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set);
1093struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1094struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace);
1095struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace);
1096void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace);
1097struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace);
1098void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace);
1099void rxrpc_destroy_local(struct rxrpc_local *local);
1100void rxrpc_destroy_all_locals(struct rxrpc_net *);
1101
1102static inline bool __rxrpc_use_local(struct rxrpc_local *local,
1103				     enum rxrpc_local_trace why)
1104{
1105	int r, u;
1106
1107	r = refcount_read(&local->ref);
1108	u = atomic_fetch_add_unless(&local->active_users, 1, 0);
1109	trace_rxrpc_local(local->debug_id, why, r, u);
1110	return u != 0;
1111}
1112
1113static inline void rxrpc_see_local(struct rxrpc_local *local,
1114				   enum rxrpc_local_trace why)
1115{
1116	int r, u;
1117
1118	r = refcount_read(&local->ref);
1119	u = atomic_read(&local->active_users);
1120	trace_rxrpc_local(local->debug_id, why, r, u);
1121}
1122
1123/*
1124 * misc.c
1125 */
1126extern unsigned int rxrpc_max_backlog __read_mostly;
1127extern unsigned long rxrpc_soft_ack_delay;
1128extern unsigned long rxrpc_idle_ack_delay;
1129extern unsigned int rxrpc_rx_window_size;
1130extern unsigned int rxrpc_rx_mtu;
1131extern unsigned int rxrpc_rx_jumbo_max;
1132#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
1133extern unsigned long rxrpc_inject_rx_delay;
1134#endif
1135
1136/*
1137 * net_ns.c
1138 */
1139extern unsigned int rxrpc_net_id;
1140extern struct pernet_operations rxrpc_net_ops;
1141
1142static inline struct rxrpc_net *rxrpc_net(struct net *net)
1143{
1144	return net_generic(net, rxrpc_net_id);
1145}
1146
1147/*
1148 * output.c
1149 */
1150void rxrpc_send_ACK(struct rxrpc_call *call, u8 ack_reason,
1151		    rxrpc_serial_t serial, enum rxrpc_propose_ack_trace why);
1152int rxrpc_send_abort_packet(struct rxrpc_call *);
1153void rxrpc_send_conn_abort(struct rxrpc_connection *conn);
1154void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb);
1155void rxrpc_send_keepalive(struct rxrpc_peer *);
1156void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
1157
1158/*
1159 * peer_event.c
1160 */
1161void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *);
1162void rxrpc_peer_keepalive_worker(struct work_struct *);
1163
1164/*
1165 * peer_object.c
1166 */
1167struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1168					 const struct sockaddr_rxrpc *);
1169struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local,
1170				     struct sockaddr_rxrpc *srx, gfp_t gfp);
1171struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t,
1172				    enum rxrpc_peer_trace);
1173void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer);
1174void rxrpc_destroy_all_peers(struct rxrpc_net *);
1175struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1176struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace);
1177void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1178
1179/*
1180 * proc.c
1181 */
1182extern const struct seq_operations rxrpc_call_seq_ops;
1183extern const struct seq_operations rxrpc_connection_seq_ops;
1184extern const struct seq_operations rxrpc_bundle_seq_ops;
1185extern const struct seq_operations rxrpc_peer_seq_ops;
1186extern const struct seq_operations rxrpc_local_seq_ops;
1187
1188/*
1189 * recvmsg.c
1190 */
1191void rxrpc_notify_socket(struct rxrpc_call *);
1192int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1193
1194/*
1195 * Abort a call due to a protocol error.
1196 */
1197static inline int rxrpc_abort_eproto(struct rxrpc_call *call,
1198				     struct sk_buff *skb,
1199				     s32 abort_code,
1200				     enum rxrpc_abort_reason why)
1201{
1202	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
1203
1204	rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why);
1205	return -EPROTO;
1206}
1207
1208/*
1209 * rtt.c
1210 */
1211void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int,
1212			rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1213ktime_t rxrpc_get_rto_backoff(struct rxrpc_peer *peer, bool retrans);
1214void rxrpc_peer_init_rtt(struct rxrpc_peer *);
1215
1216/*
1217 * rxkad.c
1218 */
1219#ifdef CONFIG_RXKAD
1220extern const struct rxrpc_security rxkad;
1221#endif
1222
1223/*
1224 * security.c
1225 */
1226int __init rxrpc_init_security(void);
1227const struct rxrpc_security *rxrpc_security_lookup(u8);
1228void rxrpc_exit_security(void);
1229int rxrpc_init_client_call_security(struct rxrpc_call *);
1230int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1231const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *,
1232							 struct sk_buff *);
1233struct key *rxrpc_look_up_server_security(struct rxrpc_connection *,
1234					  struct sk_buff *, u32, u32);
1235
1236/*
1237 * sendmsg.c
1238 */
1239bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error,
1240			 enum rxrpc_abort_reason why);
1241int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1242
1243/*
1244 * server_key.c
1245 */
1246extern struct key_type key_type_rxrpc_s;
1247
1248int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int);
1249
1250/*
1251 * skbuff.c
1252 */
1253void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1254void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1255void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1256void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
1257void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1258void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1259void rxrpc_purge_queue(struct sk_buff_head *);
1260
1261/*
1262 * stats.c
1263 */
1264int rxrpc_stats_show(struct seq_file *seq, void *v);
1265int rxrpc_stats_clear(struct file *file, char *buf, size_t size);
1266
1267#define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s)
1268#define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s)
 
 
 
 
1269
1270/*
1271 * sysctl.c
1272 */
1273#ifdef CONFIG_SYSCTL
1274extern int __init rxrpc_sysctl_init(void);
1275extern void rxrpc_sysctl_exit(void);
1276#else
1277static inline int __init rxrpc_sysctl_init(void) { return 0; }
1278static inline void rxrpc_sysctl_exit(void) {}
1279#endif
1280
1281/*
1282 * txbuf.c
1283 */
1284extern atomic_t rxrpc_nr_txbuf;
1285struct rxrpc_txbuf *rxrpc_alloc_data_txbuf(struct rxrpc_call *call, size_t data_size,
1286					   size_t data_align, gfp_t gfp);
1287struct rxrpc_txbuf *rxrpc_alloc_ack_txbuf(struct rxrpc_call *call, size_t sack_size);
1288void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1289void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1290void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1291
1292/*
1293 * utils.c
1294 */
1295int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1296
1297static inline bool before(u32 seq1, u32 seq2)
1298{
1299        return (s32)(seq1 - seq2) < 0;
1300}
1301static inline bool before_eq(u32 seq1, u32 seq2)
1302{
1303        return (s32)(seq1 - seq2) <= 0;
1304}
1305static inline bool after(u32 seq1, u32 seq2)
1306{
1307        return (s32)(seq1 - seq2) > 0;
1308}
1309static inline bool after_eq(u32 seq1, u32 seq2)
1310{
1311        return (s32)(seq1 - seq2) >= 0;
1312}
1313
1314/*
1315 * debug tracing
1316 */
1317extern unsigned int rxrpc_debug;
1318
1319#define dbgprintk(FMT,...) \
1320	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1321
1322#define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1323#define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1324#define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
 
 
1325
1326
1327#if defined(__KDEBUG)
1328#define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
1329#define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
1330#define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
 
 
1331
1332#elif defined(CONFIG_AF_RXRPC_DEBUG)
1333#define RXRPC_DEBUG_KENTER	0x01
1334#define RXRPC_DEBUG_KLEAVE	0x02
1335#define RXRPC_DEBUG_KDEBUG	0x04
 
 
1336
1337#define _enter(FMT,...)					\
1338do {							\
1339	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER))	\
1340		kenter(FMT,##__VA_ARGS__);		\
1341} while (0)
1342
1343#define _leave(FMT,...)					\
1344do {							\
1345	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE))	\
1346		kleave(FMT,##__VA_ARGS__);		\
1347} while (0)
1348
1349#define _debug(FMT,...)					\
1350do {							\
1351	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG))	\
1352		kdebug(FMT,##__VA_ARGS__);		\
1353} while (0)
1354
 
 
 
 
 
 
 
 
 
 
 
 
1355#else
1356#define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1357#define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1358#define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
 
 
1359#endif
1360
1361/*
1362 * debug assertion checking
1363 */
1364#if 1 // defined(__KDEBUGALL)
1365
1366#define ASSERT(X)						\
1367do {								\
1368	if (unlikely(!(X))) {					\
1369		pr_err("Assertion failed\n");			\
 
1370		BUG();						\
1371	}							\
1372} while (0)
1373
1374#define ASSERTCMP(X, OP, Y)						\
1375do {									\
1376	__typeof__(X) _x = (X);						\
1377	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1378	if (unlikely(!(_x OP _y))) {					\
1379		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1380		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1381		       (unsigned long)_y, (unsigned long)_y);		\
 
1382		BUG();							\
1383	}								\
1384} while (0)
1385
1386#define ASSERTIF(C, X)						\
1387do {								\
1388	if (unlikely((C) && !(X))) {				\
1389		pr_err("Assertion failed\n");			\
 
1390		BUG();						\
1391	}							\
1392} while (0)
1393
1394#define ASSERTIFCMP(C, X, OP, Y)					\
1395do {									\
1396	__typeof__(X) _x = (X);						\
1397	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1398	if (unlikely((C) && !(_x OP _y))) {				\
1399		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1400		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1401		       (unsigned long)_y, (unsigned long)_y);		\
 
1402		BUG();							\
1403	}								\
1404} while (0)
1405
1406#else
1407
1408#define ASSERT(X)				\
1409do {						\
1410} while (0)
1411
1412#define ASSERTCMP(X, OP, Y)			\
1413do {						\
1414} while (0)
1415
1416#define ASSERTIF(C, X)				\
1417do {						\
1418} while (0)
1419
1420#define ASSERTIFCMP(C, X, OP, Y)		\
1421do {						\
1422} while (0)
1423
1424#endif /* __KDEBUGALL */