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 <net/net_namespace.h>
  11#include <net/netns/generic.h>
  12#include <net/sock.h>
  13#include <net/af_rxrpc.h>
  14#include "protocol.h"
  15
  16#if 0
  17#define CHECK_SLAB_OKAY(X)				     \
  18	BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
  19	       (POISON_FREE << 8 | POISON_FREE))
  20#else
  21#define CHECK_SLAB_OKAY(X) do {} while (0)
  22#endif
  23
  24#define FCRYPT_BSIZE 8
  25struct rxrpc_crypt {
  26	union {
  27		u8	x[FCRYPT_BSIZE];
  28		__be32	n[2];
  29	};
  30} __attribute__((aligned(8)));
  31
  32#define rxrpc_queue_work(WS)	queue_work(rxrpc_workqueue, (WS))
  33#define rxrpc_queue_delayed_work(WS,D)	\
  34	queue_delayed_work(rxrpc_workqueue, (WS), (D))
  35
  36struct rxrpc_connection;
  37
  38/*
  39 * Mark applied to socket buffers in skb->mark.  skb->priority is used
  40 * to pass supplementary information.
  41 */
  42enum rxrpc_skb_mark {
  43	RXRPC_SKB_MARK_REJECT_BUSY,	/* Reject with BUSY */
  44	RXRPC_SKB_MARK_REJECT_ABORT,	/* Reject with ABORT (code in skb->priority) */
  45};
  46
  47/*
  48 * sk_state for RxRPC sockets
  49 */
  50enum {
  51	RXRPC_UNBOUND = 0,
  52	RXRPC_CLIENT_UNBOUND,		/* Unbound socket used as client */
  53	RXRPC_CLIENT_BOUND,		/* client local address bound */
  54	RXRPC_SERVER_BOUND,		/* server local address bound */
  55	RXRPC_SERVER_BOUND2,		/* second server local address bound */
  56	RXRPC_SERVER_LISTENING,		/* server listening for connections */
  57	RXRPC_SERVER_LISTEN_DISABLED,	/* server listening disabled */
  58	RXRPC_CLOSE,			/* socket is being closed */
  59};
  60
  61/*
  62 * Per-network namespace data.
  63 */
  64struct rxrpc_net {
  65	struct proc_dir_entry	*proc_net;	/* Subdir in /proc/net */
  66	u32			epoch;		/* Local epoch for detecting local-end reset */
  67	struct list_head	calls;		/* List of calls active in this namespace */
  68	rwlock_t		call_lock;	/* Lock for ->calls */
  69	atomic_t		nr_calls;	/* Count of allocated calls */
  70
  71	atomic_t		nr_conns;
  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	unsigned int		nr_client_conns;
  79	unsigned int		nr_active_client_conns;
  80	bool			kill_all_client_conns;
  81	bool			live;
  82	spinlock_t		client_conn_cache_lock; /* Lock for ->*_client_conns */
  83	spinlock_t		client_conn_discard_lock; /* Prevent multiple discarders */
  84	struct list_head	waiting_client_conns;
  85	struct list_head	active_client_conns;
  86	struct list_head	idle_client_conns;
  87	struct work_struct	client_conn_reaper;
  88	struct timer_list	client_conn_reap_timer;
  89
  90	struct list_head	local_endpoints;
  91	struct mutex		local_mutex;	/* Lock for ->local_endpoints */
  92
  93	DECLARE_HASHTABLE	(peer_hash, 10);
  94	spinlock_t		peer_hash_lock;	/* Lock for ->peer_hash */
  95
  96#define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
  97	u8			peer_keepalive_cursor;
  98	time64_t		peer_keepalive_base;
  99	struct list_head	peer_keepalive[32];
 100	struct list_head	peer_keepalive_new;
 101	struct timer_list	peer_keepalive_timer;
 102	struct work_struct	peer_keepalive_work;
 103};
 104
 105/*
 106 * Service backlog preallocation.
 107 *
 108 * This contains circular buffers of preallocated peers, connections and calls
 109 * for incoming service calls and their head and tail pointers.  This allows
 110 * calls to be set up in the data_ready handler, thereby avoiding the need to
 111 * shuffle packets around so much.
 112 */
 113struct rxrpc_backlog {
 114	unsigned short		peer_backlog_head;
 115	unsigned short		peer_backlog_tail;
 116	unsigned short		conn_backlog_head;
 117	unsigned short		conn_backlog_tail;
 118	unsigned short		call_backlog_head;
 119	unsigned short		call_backlog_tail;
 120#define RXRPC_BACKLOG_MAX	32
 121	struct rxrpc_peer	*peer_backlog[RXRPC_BACKLOG_MAX];
 122	struct rxrpc_connection	*conn_backlog[RXRPC_BACKLOG_MAX];
 123	struct rxrpc_call	*call_backlog[RXRPC_BACKLOG_MAX];
 124};
 125
 126/*
 127 * RxRPC socket definition
 128 */
 129struct rxrpc_sock {
 130	/* WARNING: sk has to be the first member */
 131	struct sock		sk;
 132	rxrpc_notify_new_call_t	notify_new_call; /* Func to notify of new call */
 133	rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
 134	struct rxrpc_local	*local;		/* local endpoint */
 135	struct rxrpc_backlog	*backlog;	/* Preallocation for services */
 136	spinlock_t		incoming_lock;	/* Incoming call vs service shutdown lock */
 137	struct list_head	sock_calls;	/* List of calls owned by this socket */
 138	struct list_head	to_be_accepted;	/* calls awaiting acceptance */
 139	struct list_head	recvmsg_q;	/* Calls awaiting recvmsg's attention  */
 140	rwlock_t		recvmsg_lock;	/* Lock for recvmsg_q */
 141	struct key		*key;		/* security for this socket */
 142	struct key		*securities;	/* list of server security descriptors */
 143	struct rb_root		calls;		/* User ID -> call mapping */
 144	unsigned long		flags;
 145#define RXRPC_SOCK_CONNECTED		0	/* connect_srx is set */
 146	rwlock_t		call_lock;	/* lock for calls */
 147	u32			min_sec_level;	/* minimum security level */
 148#define RXRPC_SECURITY_MAX	RXRPC_SECURITY_ENCRYPT
 149	bool			exclusive;	/* Exclusive connection for a client socket */
 150	u16			second_service;	/* Additional service bound to the endpoint */
 151	struct {
 152		/* Service upgrade information */
 153		u16		from;		/* Service ID to upgrade (if not 0) */
 154		u16		to;		/* service ID to upgrade to */
 155	} service_upgrade;
 156	sa_family_t		family;		/* Protocol family created with */
 157	struct sockaddr_rxrpc	srx;		/* Primary Service/local addresses */
 158	struct sockaddr_rxrpc	connect_srx;	/* Default client address from connect() */
 159};
 160
 161#define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
 162
 163/*
 164 * CPU-byteorder normalised Rx packet header.
 165 */
 166struct rxrpc_host_header {
 167	u32		epoch;		/* client boot timestamp */
 168	u32		cid;		/* connection and channel ID */
 169	u32		callNumber;	/* call ID (0 for connection-level packets) */
 170	u32		seq;		/* sequence number of pkt in call stream */
 171	u32		serial;		/* serial number of pkt sent to network */
 172	u8		type;		/* packet type */
 173	u8		flags;		/* packet flags */
 174	u8		userStatus;	/* app-layer defined status */
 175	u8		securityIndex;	/* security protocol ID */
 176	union {
 177		u16	_rsvd;		/* reserved */
 178		u16	cksum;		/* kerberos security checksum */
 179	};
 180	u16		serviceId;	/* service ID */
 181} __packed;
 182
 183/*
 184 * RxRPC socket buffer private variables
 185 * - max 48 bytes (struct sk_buff::cb)
 186 */
 187struct rxrpc_skb_priv {
 188	atomic_t	nr_ring_pins;		/* Number of rxtx ring pins */
 189	u8		nr_subpackets;		/* Number of subpackets */
 190	u8		rx_flags;		/* Received packet flags */
 191#define RXRPC_SKB_INCL_LAST	0x01		/* - Includes last packet */
 192#define RXRPC_SKB_TX_BUFFER	0x02		/* - Is transmit buffer */
 193	union {
 194		int		remain;		/* amount of space remaining for next write */
 195
 196		/* List of requested ACKs on subpackets */
 197		unsigned long	rx_req_ack[(RXRPC_MAX_NR_JUMBO + BITS_PER_LONG - 1) /
 198					   BITS_PER_LONG];
 199	};
 200
 201	struct rxrpc_host_header hdr;		/* RxRPC packet header from this packet */
 202};
 203
 204#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
 205
 206/*
 207 * RxRPC security module interface
 208 */
 209struct rxrpc_security {
 210	const char		*name;		/* name of this service */
 211	u8			security_index;	/* security type provided */
 
 212
 213	/* Initialise a security service */
 214	int (*init)(void);
 215
 216	/* Clean up a security service */
 217	void (*exit)(void);
 218
 219	/* initialise a connection's security */
 220	int (*init_connection_security)(struct rxrpc_connection *);
 221
 222	/* prime a connection's packet security */
 223	int (*prime_packet_security)(struct rxrpc_connection *);
 224
 225	/* impose security on a packet */
 226	int (*secure_packet)(struct rxrpc_call *,
 227			     struct sk_buff *,
 228			     size_t,
 229			     void *);
 230
 231	/* verify the security on a received packet */
 232	int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
 233			     unsigned int, unsigned int, rxrpc_seq_t, u16);
 234
 235	/* Free crypto request on a call */
 236	void (*free_call_crypto)(struct rxrpc_call *);
 237
 238	/* Locate the data in a received packet that has been verified. */
 239	void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
 240			    unsigned int *, unsigned int *);
 241
 242	/* issue a challenge */
 243	int (*issue_challenge)(struct rxrpc_connection *);
 244
 245	/* respond to a challenge */
 246	int (*respond_to_challenge)(struct rxrpc_connection *,
 247				    struct sk_buff *,
 248				    u32 *);
 249
 250	/* verify a response */
 251	int (*verify_response)(struct rxrpc_connection *,
 252			       struct sk_buff *,
 253			       u32 *);
 254
 255	/* clear connection security */
 256	void (*clear)(struct rxrpc_connection *);
 257};
 258
 259/*
 260 * RxRPC local transport endpoint description
 261 * - owned by a single AF_RXRPC socket
 262 * - pointed to by transport socket struct sk_user_data
 263 */
 264struct rxrpc_local {
 265	struct rcu_head		rcu;
 266	atomic_t		active_users;	/* Number of users of the local endpoint */
 267	atomic_t		usage;		/* Number of references to the structure */
 268	struct rxrpc_net	*rxnet;		/* The network ns in which this resides */
 269	struct list_head	link;
 270	struct socket		*socket;	/* my UDP socket */
 271	struct work_struct	processor;
 272	struct rxrpc_sock __rcu	*service;	/* Service(s) listening on this endpoint */
 273	struct rw_semaphore	defrag_sem;	/* control re-enablement of IP DF bit */
 274	struct sk_buff_head	reject_queue;	/* packets awaiting rejection */
 275	struct sk_buff_head	event_queue;	/* endpoint event packets awaiting processing */
 276	struct rb_root		client_conns;	/* Client connections by socket params */
 277	spinlock_t		client_conns_lock; /* Lock for client_conns */
 278	spinlock_t		lock;		/* access lock */
 279	rwlock_t		services_lock;	/* lock for services list */
 280	int			debug_id;	/* debug ID for printks */
 281	bool			dead;
 282	bool			service_closed;	/* Service socket closed */
 283	struct sockaddr_rxrpc	srx;		/* local address */
 284};
 285
 286/*
 287 * RxRPC remote transport endpoint definition
 288 * - matched by local endpoint, remote port, address and protocol type
 289 */
 290struct rxrpc_peer {
 291	struct rcu_head		rcu;		/* This must be first */
 292	atomic_t		usage;
 293	unsigned long		hash_key;
 294	struct hlist_node	hash_link;
 295	struct rxrpc_local	*local;
 296	struct hlist_head	error_targets;	/* targets for net error distribution */
 297	struct rb_root		service_conns;	/* Service connections */
 298	struct list_head	keepalive_link;	/* Link in net->peer_keepalive[] */
 299	time64_t		last_tx_at;	/* Last time packet sent here */
 300	seqlock_t		service_conn_lock;
 301	spinlock_t		lock;		/* access lock */
 302	unsigned int		if_mtu;		/* interface MTU for this peer */
 303	unsigned int		mtu;		/* network MTU for this peer */
 304	unsigned int		maxdata;	/* data size (MTU - hdrsize) */
 305	unsigned short		hdrsize;	/* header size (IP + UDP + RxRPC) */
 306	int			debug_id;	/* debug ID for printks */
 307	struct sockaddr_rxrpc	srx;		/* remote address */
 308
 309	/* calculated RTT cache */
 310#define RXRPC_RTT_CACHE_SIZE 32
 311	spinlock_t		rtt_input_lock;	/* RTT lock for input routine */
 312	ktime_t			rtt_last_req;	/* Time of last RTT request */
 313	u64			rtt;		/* Current RTT estimate (in nS) */
 314	u64			rtt_sum;	/* Sum of cache contents */
 315	u64			rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
 316	u8			rtt_cursor;	/* next entry at which to insert */
 317	u8			rtt_usage;	/* amount of cache actually used */
 
 
 
 318
 319	u8			cong_cwnd;	/* Congestion window size */
 320};
 321
 322/*
 323 * Keys for matching a connection.
 324 */
 325struct rxrpc_conn_proto {
 326	union {
 327		struct {
 328			u32	epoch;		/* epoch of this connection */
 329			u32	cid;		/* connection ID */
 330		};
 331		u64		index_key;
 332	};
 333};
 334
 335struct rxrpc_conn_parameters {
 336	struct rxrpc_local	*local;		/* Representation of local endpoint */
 337	struct rxrpc_peer	*peer;		/* Remote endpoint */
 338	struct key		*key;		/* Security details */
 339	bool			exclusive;	/* T if conn is exclusive */
 340	bool			upgrade;	/* T if service ID can be upgraded */
 341	u16			service_id;	/* Service ID for this connection */
 342	u32			security_level;	/* Security level selected */
 343};
 344
 345/*
 346 * Bits in the connection flags.
 347 */
 348enum rxrpc_conn_flag {
 349	RXRPC_CONN_HAS_IDR,		/* Has a client conn ID assigned */
 350	RXRPC_CONN_IN_SERVICE_CONNS,	/* Conn is in peer->service_conns */
 351	RXRPC_CONN_IN_CLIENT_CONNS,	/* Conn is in local->client_conns */
 352	RXRPC_CONN_EXPOSED,		/* Conn has extra ref for exposure */
 353	RXRPC_CONN_DONT_REUSE,		/* Don't reuse this connection */
 354	RXRPC_CONN_COUNTED,		/* Counted by rxrpc_nr_client_conns */
 355	RXRPC_CONN_PROBING_FOR_UPGRADE,	/* Probing for service upgrade */
 356	RXRPC_CONN_FINAL_ACK_0,		/* Need final ACK for channel 0 */
 357	RXRPC_CONN_FINAL_ACK_1,		/* Need final ACK for channel 1 */
 358	RXRPC_CONN_FINAL_ACK_2,		/* Need final ACK for channel 2 */
 359	RXRPC_CONN_FINAL_ACK_3,		/* Need final ACK for channel 3 */
 360};
 361
 362#define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |	\
 363				   (1UL << RXRPC_CONN_FINAL_ACK_1) |	\
 364				   (1UL << RXRPC_CONN_FINAL_ACK_2) |	\
 365				   (1UL << RXRPC_CONN_FINAL_ACK_3))
 366
 367/*
 368 * Events that can be raised upon a connection.
 369 */
 370enum rxrpc_conn_event {
 371	RXRPC_CONN_EV_CHALLENGE,	/* Send challenge packet */
 372};
 373
 374/*
 375 * The connection cache state.
 376 */
 377enum rxrpc_conn_cache_state {
 378	RXRPC_CONN_CLIENT_INACTIVE,	/* Conn is not yet listed */
 379	RXRPC_CONN_CLIENT_WAITING,	/* Conn is on wait list, waiting for capacity */
 380	RXRPC_CONN_CLIENT_ACTIVE,	/* Conn is on active list, doing calls */
 381	RXRPC_CONN_CLIENT_UPGRADE,	/* Conn is on active list, probing for upgrade */
 382	RXRPC_CONN_CLIENT_CULLED,	/* Conn is culled and delisted, doing calls */
 383	RXRPC_CONN_CLIENT_IDLE,		/* Conn is on idle list, doing mostly nothing */
 384	RXRPC_CONN__NR_CACHE_STATES
 385};
 386
 387/*
 388 * The connection protocol state.
 389 */
 390enum rxrpc_conn_proto_state {
 391	RXRPC_CONN_UNUSED,		/* Connection not yet attempted */
 392	RXRPC_CONN_CLIENT,		/* Client connection */
 393	RXRPC_CONN_SERVICE_PREALLOC,	/* Service connection preallocation */
 394	RXRPC_CONN_SERVICE_UNSECURED,	/* Service unsecured connection */
 395	RXRPC_CONN_SERVICE_CHALLENGING,	/* Service challenging for security */
 396	RXRPC_CONN_SERVICE,		/* Service secured connection */
 397	RXRPC_CONN_REMOTELY_ABORTED,	/* Conn aborted by peer */
 398	RXRPC_CONN_LOCALLY_ABORTED,	/* Conn aborted locally */
 399	RXRPC_CONN__NR_STATES
 400};
 401
 402/*
 403 * RxRPC connection definition
 404 * - matched by { local, peer, epoch, conn_id, direction }
 405 * - each connection can only handle four simultaneous calls
 406 */
 407struct rxrpc_connection {
 408	struct rxrpc_conn_proto	proto;
 409	struct rxrpc_conn_parameters params;
 410
 411	atomic_t		usage;
 412	struct rcu_head		rcu;
 413	struct list_head	cache_link;
 414
 415	spinlock_t		channel_lock;
 416	unsigned char		active_chans;	/* Mask of active channels */
 417#define RXRPC_ACTIVE_CHANS_MASK	((1 << RXRPC_MAXCALLS) - 1)
 418	struct list_head	waiting_calls;	/* Calls waiting for channels */
 419	struct rxrpc_channel {
 420		unsigned long		final_ack_at;	/* Time at which to issue final ACK */
 421		struct rxrpc_call __rcu	*call;		/* Active call */
 422		unsigned int		call_debug_id;	/* call->debug_id */
 423		u32			call_id;	/* ID of current call */
 424		u32			call_counter;	/* Call ID counter */
 425		u32			last_call;	/* ID of last call */
 426		u8			last_type;	/* Type of last packet */
 427		union {
 428			u32		last_seq;
 429			u32		last_abort;
 430		};
 431	} channels[RXRPC_MAXCALLS];
 432
 433	struct timer_list	timer;		/* Conn event timer */
 434	struct work_struct	processor;	/* connection event processor */
 435	union {
 436		struct rb_node	client_node;	/* Node in local->client_conns */
 437		struct rb_node	service_node;	/* Node in peer->service_conns */
 438	};
 439	struct list_head	proc_link;	/* link in procfs list */
 440	struct list_head	link;		/* link in master connection list */
 441	struct sk_buff_head	rx_queue;	/* received conn-level packets */
 442	const struct rxrpc_security *security;	/* applied security module */
 443	struct key		*server_key;	/* security for this service */
 444	struct crypto_sync_skcipher *cipher;	/* encryption handle */
 445	struct rxrpc_crypt	csum_iv;	/* packet checksum base */
 446	unsigned long		flags;
 447	unsigned long		events;
 448	unsigned long		idle_timestamp;	/* Time at which last became idle */
 449	spinlock_t		state_lock;	/* state-change lock */
 450	enum rxrpc_conn_cache_state cache_state;
 451	enum rxrpc_conn_proto_state state;	/* current state of connection */
 452	u32			abort_code;	/* Abort code of connection abort */
 453	int			debug_id;	/* debug ID for printks */
 454	atomic_t		serial;		/* packet serial number counter */
 455	unsigned int		hi_serial;	/* highest serial number received */
 456	u32			security_nonce;	/* response re-use preventer */
 457	u32			service_id;	/* Service ID, possibly upgraded */
 458	u8			size_align;	/* data size alignment (for security) */
 459	u8			security_size;	/* security header size */
 460	u8			security_ix;	/* security type */
 461	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
 462	short			error;		/* Local error code */
 463};
 464
 465static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
 466{
 467	return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
 468}
 469
 470static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
 471{
 472	return !rxrpc_to_server(sp);
 473}
 474
 475/*
 476 * Flags in call->flags.
 477 */
 478enum rxrpc_call_flag {
 479	RXRPC_CALL_RELEASED,		/* call has been released - no more message to userspace */
 480	RXRPC_CALL_HAS_USERID,		/* has a user ID attached */
 481	RXRPC_CALL_IS_SERVICE,		/* Call is service call */
 482	RXRPC_CALL_EXPOSED,		/* The call was exposed to the world */
 483	RXRPC_CALL_RX_LAST,		/* Received the last packet (at rxtx_top) */
 484	RXRPC_CALL_TX_LAST,		/* Last packet in Tx buffer (at rxtx_top) */
 485	RXRPC_CALL_SEND_PING,		/* A ping will need to be sent */
 486	RXRPC_CALL_PINGING,		/* Ping in process */
 487	RXRPC_CALL_RETRANS_TIMEOUT,	/* Retransmission due to timeout occurred */
 488	RXRPC_CALL_BEGAN_RX_TIMER,	/* We began the expect_rx_by timer */
 489	RXRPC_CALL_RX_HEARD,		/* The peer responded at least once to this call */
 490	RXRPC_CALL_RX_UNDERRUN,		/* Got data underrun */
 491	RXRPC_CALL_IS_INTR,		/* The call is interruptible */
 492};
 493
 494/*
 495 * Events that can be raised on a call.
 496 */
 497enum rxrpc_call_event {
 498	RXRPC_CALL_EV_ACK,		/* need to generate ACK */
 499	RXRPC_CALL_EV_ABORT,		/* need to generate abort */
 500	RXRPC_CALL_EV_RESEND,		/* Tx resend required */
 501	RXRPC_CALL_EV_PING,		/* Ping send required */
 502	RXRPC_CALL_EV_EXPIRED,		/* Expiry occurred */
 503	RXRPC_CALL_EV_ACK_LOST,		/* ACK may be lost, send ping */
 504};
 505
 506/*
 507 * The states that a call can be in.
 508 */
 509enum rxrpc_call_state {
 510	RXRPC_CALL_UNINITIALISED,
 511	RXRPC_CALL_CLIENT_AWAIT_CONN,	/* - client waiting for connection to become available */
 512	RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
 513	RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
 514	RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
 515	RXRPC_CALL_SERVER_PREALLOC,	/* - service preallocation */
 516	RXRPC_CALL_SERVER_SECURING,	/* - server securing request connection */
 517	RXRPC_CALL_SERVER_ACCEPTING,	/* - server accepting request */
 518	RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
 519	RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
 520	RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
 521	RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
 522	RXRPC_CALL_COMPLETE,		/* - call complete */
 523	NR__RXRPC_CALL_STATES
 524};
 525
 526/*
 527 * Call completion condition (state == RXRPC_CALL_COMPLETE).
 528 */
 529enum rxrpc_call_completion {
 530	RXRPC_CALL_SUCCEEDED,		/* - Normal termination */
 531	RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
 532	RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
 533	RXRPC_CALL_LOCAL_ERROR,		/* - call failed due to local error */
 534	RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
 535	NR__RXRPC_CALL_COMPLETIONS
 536};
 537
 538/*
 539 * Call Tx congestion management modes.
 540 */
 541enum rxrpc_congest_mode {
 542	RXRPC_CALL_SLOW_START,
 543	RXRPC_CALL_CONGEST_AVOIDANCE,
 544	RXRPC_CALL_PACKET_LOSS,
 545	RXRPC_CALL_FAST_RETRANSMIT,
 546	NR__RXRPC_CONGEST_MODES
 547};
 548
 549/*
 550 * RxRPC call definition
 551 * - matched by { connection, call_id }
 552 */
 553struct rxrpc_call {
 554	struct rcu_head		rcu;
 555	struct rxrpc_connection	*conn;		/* connection carrying call */
 556	struct rxrpc_peer	*peer;		/* Peer record for remote address */
 557	struct rxrpc_sock __rcu	*socket;	/* socket responsible */
 558	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
 559	const struct rxrpc_security *security;	/* applied security module */
 560	struct mutex		user_mutex;	/* User access mutex */
 561	unsigned long		ack_at;		/* When deferred ACK needs to happen */
 562	unsigned long		ack_lost_at;	/* When ACK is figured as lost */
 563	unsigned long		resend_at;	/* When next resend needs to happen */
 564	unsigned long		ping_at;	/* When next to send a ping */
 565	unsigned long		keepalive_at;	/* When next to send a keepalive ping */
 566	unsigned long		expect_rx_by;	/* When we expect to get a packet by */
 567	unsigned long		expect_req_by;	/* When we expect to get a request DATA packet by */
 568	unsigned long		expect_term_by;	/* When we expect call termination by */
 569	u32			next_rx_timo;	/* Timeout for next Rx packet (jif) */
 570	u32			next_req_timo;	/* Timeout for next Rx request packet (jif) */
 571	struct skcipher_request	*cipher_req;	/* Packet cipher request buffer */
 572	struct timer_list	timer;		/* Combined event timer */
 573	struct work_struct	processor;	/* Event processor */
 574	rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
 575	struct list_head	link;		/* link in master call list */
 576	struct list_head	chan_wait_link;	/* Link in conn->waiting_calls */
 577	struct hlist_node	error_link;	/* link in error distribution list */
 578	struct list_head	accept_link;	/* Link in rx->acceptq */
 579	struct list_head	recvmsg_link;	/* Link in rx->recvmsg_q */
 580	struct list_head	sock_link;	/* Link in rx->sock_calls */
 581	struct rb_node		sock_node;	/* Node in rx->calls */
 582	struct sk_buff		*tx_pending;	/* Tx socket buffer being filled */
 583	wait_queue_head_t	waitq;		/* Wait queue for channel or Tx */
 584	s64			tx_total_len;	/* Total length left to be transmitted (or -1) */
 585	__be32			crypto_buf[2];	/* Temporary packet crypto buffer */
 586	unsigned long		user_call_ID;	/* user-defined call ID */
 587	unsigned long		flags;
 588	unsigned long		events;
 589	spinlock_t		lock;
 590	spinlock_t		notify_lock;	/* Kernel notification lock */
 591	rwlock_t		state_lock;	/* lock for state transition */
 592	u32			abort_code;	/* Local/remote abort code */
 593	int			error;		/* Local error incurred */
 594	enum rxrpc_call_state	state;		/* current state of call */
 595	enum rxrpc_call_completion completion;	/* Call completion condition */
 596	atomic_t		usage;
 597	u16			service_id;	/* service ID */
 598	u8			security_ix;	/* Security type */
 
 599	u32			call_id;	/* call ID on connection  */
 600	u32			cid;		/* connection ID plus channel index */
 601	int			debug_id;	/* debug ID for printks */
 602	unsigned short		rx_pkt_offset;	/* Current recvmsg packet offset */
 603	unsigned short		rx_pkt_len;	/* Current recvmsg packet len */
 604	bool			rx_pkt_last;	/* Current recvmsg packet is last */
 605
 606	/* Rx/Tx circular buffer, depending on phase.
 607	 *
 608	 * In the Rx phase, packets are annotated with 0 or the number of the
 609	 * segment of a jumbo packet each buffer refers to.  There can be up to
 610	 * 47 segments in a maximum-size UDP packet.
 611	 *
 612	 * In the Tx phase, packets are annotated with which buffers have been
 613	 * acked.
 614	 */
 615#define RXRPC_RXTX_BUFF_SIZE	64
 616#define RXRPC_RXTX_BUFF_MASK	(RXRPC_RXTX_BUFF_SIZE - 1)
 617#define RXRPC_INIT_RX_WINDOW_SIZE 63
 618	struct sk_buff		**rxtx_buffer;
 619	u8			*rxtx_annotations;
 620#define RXRPC_TX_ANNO_ACK	0
 621#define RXRPC_TX_ANNO_UNACK	1
 622#define RXRPC_TX_ANNO_NAK	2
 623#define RXRPC_TX_ANNO_RETRANS	3
 624#define RXRPC_TX_ANNO_MASK	0x03
 625#define RXRPC_TX_ANNO_LAST	0x04
 626#define RXRPC_TX_ANNO_RESENT	0x08
 627
 628#define RXRPC_RX_ANNO_SUBPACKET	0x3f		/* Subpacket number in jumbogram */
 629#define RXRPC_RX_ANNO_VERIFIED	0x80		/* Set if verified and decrypted */
 630	rxrpc_seq_t		tx_hard_ack;	/* Dead slot in buffer; the first transmitted but
 631						 * not hard-ACK'd packet follows this.
 632						 */
 633	rxrpc_seq_t		tx_top;		/* Highest Tx slot allocated. */
 634	u16			tx_backoff;	/* Delay to insert due to Tx failure */
 635
 636	/* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
 637	 * is fixed, we keep these numbers in terms of segments (ie. DATA
 638	 * packets) rather than bytes.
 639	 */
 640#define RXRPC_TX_SMSS		RXRPC_JUMBO_DATALEN
 641	u8			cong_cwnd;	/* Congestion window size */
 642	u8			cong_extra;	/* Extra to send for congestion management */
 643	u8			cong_ssthresh;	/* Slow-start threshold */
 644	enum rxrpc_congest_mode	cong_mode:8;	/* Congestion management mode */
 645	u8			cong_dup_acks;	/* Count of ACKs showing missing packets */
 646	u8			cong_cumul_acks; /* Cumulative ACK count */
 647	ktime_t			cong_tstamp;	/* Last time cwnd was changed */
 648
 649	rxrpc_seq_t		rx_hard_ack;	/* Dead slot in buffer; the first received but not
 650						 * consumed packet follows this.
 651						 */
 652	rxrpc_seq_t		rx_top;		/* Highest Rx slot allocated. */
 653	rxrpc_seq_t		rx_expect_next;	/* Expected next packet sequence number */
 654	rxrpc_serial_t		rx_serial;	/* Highest serial received for this call */
 655	u8			rx_winsize;	/* Size of Rx window */
 656	u8			tx_winsize;	/* Maximum size of Tx window */
 657	bool			tx_phase;	/* T if transmission phase, F if receive phase */
 658	u8			nr_jumbo_bad;	/* Number of jumbo dups/exceeds-windows */
 659
 660	spinlock_t		input_lock;	/* Lock for packet input to this call */
 661
 662	/* receive-phase ACK management */
 663	u8			ackr_reason;	/* reason to ACK */
 664	rxrpc_serial_t		ackr_serial;	/* serial of packet being ACK'd */
 665	rxrpc_serial_t		ackr_first_seq;	/* first sequence number received */
 666	rxrpc_seq_t		ackr_prev_seq;	/* previous sequence number received */
 667	rxrpc_seq_t		ackr_consumed;	/* Highest packet shown consumed */
 668	rxrpc_seq_t		ackr_seen;	/* Highest packet shown seen */
 669
 670	/* ping management */
 671	rxrpc_serial_t		ping_serial;	/* Last ping sent */
 672	ktime_t			ping_time;	/* Time last ping sent */
 
 
 
 
 673
 674	/* transmission-phase ACK management */
 675	ktime_t			acks_latest_ts;	/* Timestamp of latest ACK received */
 676	rxrpc_serial_t		acks_latest;	/* serial number of latest ACK received */
 677	rxrpc_seq_t		acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
 678	rxrpc_seq_t		acks_lost_top;	/* tx_top at the time lost-ack ping sent */
 679	rxrpc_serial_t		acks_lost_ping;	/* Serial number of probe ACK */
 680};
 681
 682/*
 683 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
 684 */
 685struct rxrpc_ack_summary {
 686	u8			ack_reason;
 687	u8			nr_acks;		/* Number of ACKs in packet */
 688	u8			nr_nacks;		/* Number of NACKs in packet */
 689	u8			nr_new_acks;		/* Number of new ACKs in packet */
 690	u8			nr_new_nacks;		/* Number of new NACKs in packet */
 691	u8			nr_rot_new_acks;	/* Number of rotated new ACKs */
 692	bool			new_low_nack;		/* T if new low NACK found */
 693	bool			retrans_timeo;		/* T if reTx due to timeout happened */
 694	u8			flight_size;		/* Number of unreceived transmissions */
 695	/* Place to stash values for tracing */
 696	enum rxrpc_congest_mode	mode:8;
 697	u8			cwnd;
 698	u8			ssthresh;
 699	u8			dup_acks;
 700	u8			cumulative_acks;
 701};
 702
 703/*
 704 * sendmsg() cmsg-specified parameters.
 705 */
 706enum rxrpc_command {
 707	RXRPC_CMD_SEND_DATA,		/* send data message */
 708	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
 709	RXRPC_CMD_ACCEPT,		/* [server] accept incoming call */
 710	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
 
 711};
 712
 713struct rxrpc_call_params {
 714	s64			tx_total_len;	/* Total Tx data length (if send data) */
 715	unsigned long		user_call_ID;	/* User's call ID */
 716	struct {
 717		u32		hard;		/* Maximum lifetime (sec) */
 718		u32		idle;		/* Max time since last data packet (msec) */
 719		u32		normal;		/* Max time since last call packet (msec) */
 720	} timeouts;
 721	u8			nr_timeouts;	/* Number of timeouts specified */
 722	bool			intr;		/* The call is interruptible */
 723};
 724
 725struct rxrpc_send_params {
 726	struct rxrpc_call_params call;
 727	u32			abort_code;	/* Abort code to Tx (if abort) */
 728	enum rxrpc_command	command : 8;	/* The command to implement */
 729	bool			exclusive;	/* Shared or exclusive call */
 730	bool			upgrade;	/* If the connection is upgradeable */
 731};
 732
 733#include <trace/events/rxrpc.h>
 734
 735/*
 736 * af_rxrpc.c
 737 */
 738extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
 739extern struct workqueue_struct *rxrpc_workqueue;
 740
 741/*
 742 * call_accept.c
 743 */
 744int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
 745void rxrpc_discard_prealloc(struct rxrpc_sock *);
 746struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
 747					   struct rxrpc_sock *,
 748					   struct sk_buff *);
 749void rxrpc_accept_incoming_calls(struct rxrpc_local *);
 750struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
 751				     rxrpc_notify_rx_t);
 752int rxrpc_reject_call(struct rxrpc_sock *);
 753
 754/*
 755 * call_event.c
 756 */
 757void rxrpc_propose_ACK(struct rxrpc_call *, u8, u32, bool, bool,
 758		       enum rxrpc_propose_ack_trace);
 759void rxrpc_process_call(struct work_struct *);
 760
 761static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
 762					   unsigned long expire_at,
 763					   unsigned long now,
 764					   enum rxrpc_timer_trace why)
 765{
 766	trace_rxrpc_timer(call, why, now);
 767	timer_reduce(&call->timer, expire_at);
 768}
 769
 770/*
 771 * call_object.c
 772 */
 773extern const char *const rxrpc_call_states[];
 774extern const char *const rxrpc_call_completions[];
 775extern unsigned int rxrpc_max_call_lifetime;
 776extern struct kmem_cache *rxrpc_call_jar;
 777
 778struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
 779struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
 780struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
 781					 struct rxrpc_conn_parameters *,
 782					 struct sockaddr_rxrpc *,
 783					 struct rxrpc_call_params *, gfp_t,
 784					 unsigned int);
 785void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
 786			 struct sk_buff *);
 787void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
 788void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
 789bool __rxrpc_queue_call(struct rxrpc_call *);
 790bool rxrpc_queue_call(struct rxrpc_call *);
 791void rxrpc_see_call(struct rxrpc_call *);
 792void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
 793void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
 794void rxrpc_cleanup_call(struct rxrpc_call *);
 795void rxrpc_destroy_all_calls(struct rxrpc_net *);
 796
 797static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
 798{
 799	return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
 800}
 801
 802static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
 803{
 804	return !rxrpc_is_service_call(call);
 805}
 806
 807/*
 808 * Transition a call to the complete state.
 809 */
 810static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
 811					       enum rxrpc_call_completion compl,
 812					       u32 abort_code,
 813					       int error)
 814{
 815	if (call->state < RXRPC_CALL_COMPLETE) {
 816		call->abort_code = abort_code;
 817		call->error = error;
 818		call->completion = compl,
 819		call->state = RXRPC_CALL_COMPLETE;
 820		trace_rxrpc_call_complete(call);
 821		wake_up(&call->waitq);
 822		return true;
 823	}
 824	return false;
 825}
 826
 827static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
 828					     enum rxrpc_call_completion compl,
 829					     u32 abort_code,
 830					     int error)
 831{
 832	bool ret;
 833
 834	write_lock_bh(&call->state_lock);
 835	ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
 836	write_unlock_bh(&call->state_lock);
 837	return ret;
 838}
 839
 840/*
 841 * Record that a call successfully completed.
 842 */
 843static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
 844{
 845	return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
 846}
 847
 848static inline bool rxrpc_call_completed(struct rxrpc_call *call)
 849{
 850	bool ret;
 851
 852	write_lock_bh(&call->state_lock);
 853	ret = __rxrpc_call_completed(call);
 854	write_unlock_bh(&call->state_lock);
 855	return ret;
 856}
 857
 858/*
 859 * Record that a call is locally aborted.
 860 */
 861static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 862				      rxrpc_seq_t seq,
 863				      u32 abort_code, int error)
 864{
 865	trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
 866			  abort_code, error);
 867	return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
 868					   abort_code, error);
 869}
 870
 871static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
 872				    rxrpc_seq_t seq, u32 abort_code, int error)
 873{
 874	bool ret;
 875
 876	write_lock_bh(&call->state_lock);
 877	ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
 878	write_unlock_bh(&call->state_lock);
 879	return ret;
 880}
 881
 882/*
 883 * Abort a call due to a protocol error.
 884 */
 885static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
 886					struct sk_buff *skb,
 887					const char *eproto_why,
 888					const char *why,
 889					u32 abort_code)
 890{
 891	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 892
 893	trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
 894	return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
 895}
 896
 897#define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
 898	__rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
 899			     (abort_why), (abort_code))
 900
 901/*
 902 * conn_client.c
 903 */
 904extern unsigned int rxrpc_max_client_connections;
 905extern unsigned int rxrpc_reap_client_connections;
 906extern unsigned long rxrpc_conn_idle_client_expiry;
 907extern unsigned long rxrpc_conn_idle_client_fast_expiry;
 908extern struct idr rxrpc_client_conn_ids;
 909
 910void rxrpc_destroy_client_conn_ids(void);
 911int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_call *,
 912		       struct rxrpc_conn_parameters *, struct sockaddr_rxrpc *,
 913		       gfp_t);
 914void rxrpc_expose_client_call(struct rxrpc_call *);
 915void rxrpc_disconnect_client_call(struct rxrpc_call *);
 916void rxrpc_put_client_conn(struct rxrpc_connection *);
 917void rxrpc_discard_expired_client_conns(struct work_struct *);
 918void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
 919void rxrpc_clean_up_local_conns(struct rxrpc_local *);
 920
 921/*
 922 * conn_event.c
 923 */
 924void rxrpc_process_connection(struct work_struct *);
 925
 926/*
 927 * conn_object.c
 928 */
 929extern unsigned int rxrpc_connection_expiry;
 930extern unsigned int rxrpc_closed_conn_expiry;
 931
 932struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
 933struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
 934						   struct sk_buff *,
 935						   struct rxrpc_peer **);
 936void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
 937void rxrpc_disconnect_call(struct rxrpc_call *);
 938void rxrpc_kill_connection(struct rxrpc_connection *);
 939bool rxrpc_queue_conn(struct rxrpc_connection *);
 940void rxrpc_see_connection(struct rxrpc_connection *);
 941void rxrpc_get_connection(struct rxrpc_connection *);
 942struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
 943void rxrpc_put_service_conn(struct rxrpc_connection *);
 944void rxrpc_service_connection_reaper(struct work_struct *);
 945void rxrpc_destroy_all_connections(struct rxrpc_net *);
 946
 947static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
 948{
 949	return conn->out_clientflag;
 950}
 951
 952static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
 953{
 954	return !rxrpc_conn_is_client(conn);
 955}
 956
 957static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
 958{
 959	if (!conn)
 960		return;
 961
 962	if (rxrpc_conn_is_client(conn))
 963		rxrpc_put_client_conn(conn);
 964	else
 965		rxrpc_put_service_conn(conn);
 966}
 967
 968static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
 969					   unsigned long expire_at)
 970{
 971	timer_reduce(&conn->timer, expire_at);
 972}
 973
 974/*
 975 * conn_service.c
 976 */
 977struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
 978						     struct sk_buff *);
 979struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
 980void rxrpc_new_incoming_connection(struct rxrpc_sock *,
 981				   struct rxrpc_connection *, struct sk_buff *);
 
 982void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
 983
 984/*
 985 * input.c
 986 */
 987int rxrpc_input_packet(struct sock *, struct sk_buff *);
 988
 989/*
 990 * insecure.c
 991 */
 992extern const struct rxrpc_security rxrpc_no_security;
 993
 994/*
 995 * key.c
 996 */
 997extern struct key_type key_type_rxrpc;
 998extern struct key_type key_type_rxrpc_s;
 999
1000int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
1001int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
1002int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
1003			      u32);
1004
1005/*
1006 * local_event.c
1007 */
1008extern void rxrpc_process_local_events(struct rxrpc_local *);
1009
1010/*
1011 * local_object.c
1012 */
1013struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1014struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
1015struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
1016void rxrpc_put_local(struct rxrpc_local *);
1017struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *);
1018void rxrpc_unuse_local(struct rxrpc_local *);
1019void rxrpc_queue_local(struct rxrpc_local *);
1020void rxrpc_destroy_all_locals(struct rxrpc_net *);
1021
 
 
 
 
 
 
 
 
 
 
1022/*
1023 * misc.c
1024 */
1025extern unsigned int rxrpc_max_backlog __read_mostly;
1026extern unsigned long rxrpc_requested_ack_delay;
1027extern unsigned long rxrpc_soft_ack_delay;
1028extern unsigned long rxrpc_idle_ack_delay;
1029extern unsigned int rxrpc_rx_window_size;
1030extern unsigned int rxrpc_rx_mtu;
1031extern unsigned int rxrpc_rx_jumbo_max;
1032extern unsigned long rxrpc_resend_timeout;
1033
1034extern const s8 rxrpc_ack_priority[];
1035
1036/*
1037 * net_ns.c
1038 */
1039extern unsigned int rxrpc_net_id;
1040extern struct pernet_operations rxrpc_net_ops;
1041
1042static inline struct rxrpc_net *rxrpc_net(struct net *net)
1043{
1044	return net_generic(net, rxrpc_net_id);
1045}
1046
1047/*
1048 * output.c
1049 */
1050int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
1051int rxrpc_send_abort_packet(struct rxrpc_call *);
1052int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
1053void rxrpc_reject_packets(struct rxrpc_local *);
1054void rxrpc_send_keepalive(struct rxrpc_peer *);
1055
1056/*
1057 * peer_event.c
1058 */
1059void rxrpc_error_report(struct sock *);
1060void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
1061			rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1062void rxrpc_peer_keepalive_worker(struct work_struct *);
1063
1064/*
1065 * peer_object.c
1066 */
1067struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1068					 const struct sockaddr_rxrpc *);
1069struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *, struct rxrpc_local *,
1070				     struct sockaddr_rxrpc *, gfp_t);
1071struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
1072void rxrpc_new_incoming_peer(struct rxrpc_sock *, struct rxrpc_local *,
1073			     struct rxrpc_peer *);
1074void rxrpc_destroy_all_peers(struct rxrpc_net *);
1075struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
1076struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
1077void rxrpc_put_peer(struct rxrpc_peer *);
1078void rxrpc_put_peer_locked(struct rxrpc_peer *);
1079
1080/*
1081 * proc.c
1082 */
1083extern const struct seq_operations rxrpc_call_seq_ops;
1084extern const struct seq_operations rxrpc_connection_seq_ops;
1085extern const struct seq_operations rxrpc_peer_seq_ops;
1086
1087/*
1088 * recvmsg.c
1089 */
1090void rxrpc_notify_socket(struct rxrpc_call *);
 
 
 
 
 
 
1091int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1092
1093/*
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1094 * rxkad.c
1095 */
1096#ifdef CONFIG_RXKAD
1097extern const struct rxrpc_security rxkad;
1098#endif
1099
1100/*
1101 * security.c
1102 */
1103int __init rxrpc_init_security(void);
1104void rxrpc_exit_security(void);
1105int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1106int rxrpc_init_server_conn_security(struct rxrpc_connection *);
 
 
1107
1108/*
1109 * sendmsg.c
1110 */
1111int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1112
1113/*
1114 * skbuff.c
1115 */
1116void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1117void rxrpc_packet_destructor(struct sk_buff *);
1118void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1119void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1120void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
1121void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1122void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1123void rxrpc_purge_queue(struct sk_buff_head *);
1124
1125/*
1126 * sysctl.c
1127 */
1128#ifdef CONFIG_SYSCTL
1129extern int __init rxrpc_sysctl_init(void);
1130extern void rxrpc_sysctl_exit(void);
1131#else
1132static inline int __init rxrpc_sysctl_init(void) { return 0; }
1133static inline void rxrpc_sysctl_exit(void) {}
1134#endif
1135
1136/*
1137 * utils.c
1138 */
1139int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1140
1141static inline bool before(u32 seq1, u32 seq2)
1142{
1143        return (s32)(seq1 - seq2) < 0;
1144}
1145static inline bool before_eq(u32 seq1, u32 seq2)
1146{
1147        return (s32)(seq1 - seq2) <= 0;
1148}
1149static inline bool after(u32 seq1, u32 seq2)
1150{
1151        return (s32)(seq1 - seq2) > 0;
1152}
1153static inline bool after_eq(u32 seq1, u32 seq2)
1154{
1155        return (s32)(seq1 - seq2) >= 0;
1156}
1157
1158/*
1159 * debug tracing
1160 */
1161extern unsigned int rxrpc_debug;
1162
1163#define dbgprintk(FMT,...) \
1164	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1165
1166#define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1167#define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1168#define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
1169#define kproto(FMT,...)	dbgprintk("### "FMT ,##__VA_ARGS__)
1170#define knet(FMT,...)	dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1171
1172
1173#if defined(__KDEBUG)
1174#define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
1175#define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
1176#define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
1177#define _proto(FMT,...)	kproto(FMT,##__VA_ARGS__)
1178#define _net(FMT,...)	knet(FMT,##__VA_ARGS__)
1179
1180#elif defined(CONFIG_AF_RXRPC_DEBUG)
1181#define RXRPC_DEBUG_KENTER	0x01
1182#define RXRPC_DEBUG_KLEAVE	0x02
1183#define RXRPC_DEBUG_KDEBUG	0x04
1184#define RXRPC_DEBUG_KPROTO	0x08
1185#define RXRPC_DEBUG_KNET	0x10
1186
1187#define _enter(FMT,...)					\
1188do {							\
1189	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER))	\
1190		kenter(FMT,##__VA_ARGS__);		\
1191} while (0)
1192
1193#define _leave(FMT,...)					\
1194do {							\
1195	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE))	\
1196		kleave(FMT,##__VA_ARGS__);		\
1197} while (0)
1198
1199#define _debug(FMT,...)					\
1200do {							\
1201	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG))	\
1202		kdebug(FMT,##__VA_ARGS__);		\
1203} while (0)
1204
1205#define _proto(FMT,...)					\
1206do {							\
1207	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO))	\
1208		kproto(FMT,##__VA_ARGS__);		\
1209} while (0)
1210
1211#define _net(FMT,...)					\
1212do {							\
1213	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))	\
1214		knet(FMT,##__VA_ARGS__);		\
1215} while (0)
1216
1217#else
1218#define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1219#define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1220#define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
1221#define _proto(FMT,...)	no_printk("### "FMT ,##__VA_ARGS__)
1222#define _net(FMT,...)	no_printk("@@@ "FMT ,##__VA_ARGS__)
1223#endif
1224
1225/*
1226 * debug assertion checking
1227 */
1228#if 1 // defined(__KDEBUGALL)
1229
1230#define ASSERT(X)						\
1231do {								\
1232	if (unlikely(!(X))) {					\
1233		pr_err("Assertion failed\n");			\
1234		BUG();						\
1235	}							\
1236} while (0)
1237
1238#define ASSERTCMP(X, OP, Y)						\
1239do {									\
1240	__typeof__(X) _x = (X);						\
1241	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1242	if (unlikely(!(_x OP _y))) {					\
1243		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1244		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1245		       (unsigned long)_y, (unsigned long)_y);		\
1246		BUG();							\
1247	}								\
1248} while (0)
1249
1250#define ASSERTIF(C, X)						\
1251do {								\
1252	if (unlikely((C) && !(X))) {				\
1253		pr_err("Assertion failed\n");			\
1254		BUG();						\
1255	}							\
1256} while (0)
1257
1258#define ASSERTIFCMP(C, X, OP, Y)					\
1259do {									\
1260	__typeof__(X) _x = (X);						\
1261	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1262	if (unlikely((C) && !(_x OP _y))) {				\
1263		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1264		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1265		       (unsigned long)_y, (unsigned long)_y);		\
1266		BUG();							\
1267	}								\
1268} while (0)
1269
1270#else
1271
1272#define ASSERT(X)				\
1273do {						\
1274} while (0)
1275
1276#define ASSERTCMP(X, OP, Y)			\
1277do {						\
1278} while (0)
1279
1280#define ASSERTIF(C, X)				\
1281do {						\
1282} while (0)
1283
1284#define ASSERTIFCMP(C, X, OP, Y)		\
1285do {						\
1286} while (0)
1287
1288#endif /* __KDEBUGALL */