xref: /openbmc/linux/net/rxrpc/ar-internal.h (revision fa6dbe25)
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
19 struct 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 
30 struct key_preparsed_payload;
31 struct rxrpc_connection;
32 struct rxrpc_txbuf;
33 
34 /*
35  * Mark applied to socket buffers in skb->mark.  skb->priority is used
36  * to pass supplementary information.
37  */
38 enum 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  */
49 enum {
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  */
63 struct 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	conn_proc_list;	/* List of conns in this namespace for proc */
72 	struct list_head	service_conns;	/* Service conns in this namespace */
73 	rwlock_t		conn_lock;	/* Lock for ->conn_proc_list, ->service_conns */
74 	struct work_struct	service_conn_reaper;
75 	struct timer_list	service_conn_reap_timer;
76 
77 	bool			live;
78 
79 	atomic_t		nr_client_conns;
80 
81 	struct hlist_head	local_endpoints;
82 	struct mutex		local_mutex;	/* Lock for ->local_endpoints */
83 
84 	DECLARE_HASHTABLE	(peer_hash, 10);
85 	spinlock_t		peer_hash_lock;	/* Lock for ->peer_hash */
86 
87 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
88 	u8			peer_keepalive_cursor;
89 	time64_t		peer_keepalive_base;
90 	struct list_head	peer_keepalive[32];
91 	struct list_head	peer_keepalive_new;
92 	struct timer_list	peer_keepalive_timer;
93 	struct work_struct	peer_keepalive_work;
94 
95 	atomic_t		stat_tx_data;
96 	atomic_t		stat_tx_data_retrans;
97 	atomic_t		stat_tx_data_send;
98 	atomic_t		stat_tx_data_send_frag;
99 	atomic_t		stat_tx_data_send_fail;
100 	atomic_t		stat_tx_data_underflow;
101 	atomic_t		stat_tx_data_cwnd_reset;
102 	atomic_t		stat_rx_data;
103 	atomic_t		stat_rx_data_reqack;
104 	atomic_t		stat_rx_data_jumbo;
105 
106 	atomic_t		stat_tx_ack_fill;
107 	atomic_t		stat_tx_ack_send;
108 	atomic_t		stat_tx_ack_skip;
109 	atomic_t		stat_tx_acks[256];
110 	atomic_t		stat_rx_acks[256];
111 
112 	atomic_t		stat_why_req_ack[8];
113 
114 	atomic_t		stat_io_loop;
115 };
116 
117 /*
118  * Service backlog preallocation.
119  *
120  * This contains circular buffers of preallocated peers, connections and calls
121  * for incoming service calls and their head and tail pointers.  This allows
122  * calls to be set up in the data_ready handler, thereby avoiding the need to
123  * shuffle packets around so much.
124  */
125 struct rxrpc_backlog {
126 	unsigned short		peer_backlog_head;
127 	unsigned short		peer_backlog_tail;
128 	unsigned short		conn_backlog_head;
129 	unsigned short		conn_backlog_tail;
130 	unsigned short		call_backlog_head;
131 	unsigned short		call_backlog_tail;
132 #define RXRPC_BACKLOG_MAX	32
133 	struct rxrpc_peer	*peer_backlog[RXRPC_BACKLOG_MAX];
134 	struct rxrpc_connection	*conn_backlog[RXRPC_BACKLOG_MAX];
135 	struct rxrpc_call	*call_backlog[RXRPC_BACKLOG_MAX];
136 };
137 
138 /*
139  * RxRPC socket definition
140  */
141 struct rxrpc_sock {
142 	/* WARNING: sk has to be the first member */
143 	struct sock		sk;
144 	rxrpc_notify_new_call_t	notify_new_call; /* Func to notify of new call */
145 	rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
146 	struct rxrpc_local	*local;		/* local endpoint */
147 	struct rxrpc_backlog	*backlog;	/* Preallocation for services */
148 	spinlock_t		incoming_lock;	/* Incoming call vs service shutdown lock */
149 	struct list_head	sock_calls;	/* List of calls owned by this socket */
150 	struct list_head	to_be_accepted;	/* calls awaiting acceptance */
151 	struct list_head	recvmsg_q;	/* Calls awaiting recvmsg's attention  */
152 	spinlock_t		recvmsg_lock;	/* Lock for recvmsg_q */
153 	struct key		*key;		/* security for this socket */
154 	struct key		*securities;	/* list of server security descriptors */
155 	struct rb_root		calls;		/* User ID -> call mapping */
156 	unsigned long		flags;
157 #define RXRPC_SOCK_CONNECTED		0	/* connect_srx is set */
158 	rwlock_t		call_lock;	/* lock for calls */
159 	u32			min_sec_level;	/* minimum security level */
160 #define RXRPC_SECURITY_MAX	RXRPC_SECURITY_ENCRYPT
161 	bool			exclusive;	/* Exclusive connection for a client socket */
162 	u16			second_service;	/* Additional service bound to the endpoint */
163 	struct {
164 		/* Service upgrade information */
165 		u16		from;		/* Service ID to upgrade (if not 0) */
166 		u16		to;		/* service ID to upgrade to */
167 	} service_upgrade;
168 	sa_family_t		family;		/* Protocol family created with */
169 	struct sockaddr_rxrpc	srx;		/* Primary Service/local addresses */
170 	struct sockaddr_rxrpc	connect_srx;	/* Default client address from connect() */
171 };
172 
173 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
174 
175 /*
176  * CPU-byteorder normalised Rx packet header.
177  */
178 struct rxrpc_host_header {
179 	u32		epoch;		/* client boot timestamp */
180 	u32		cid;		/* connection and channel ID */
181 	u32		callNumber;	/* call ID (0 for connection-level packets) */
182 	u32		seq;		/* sequence number of pkt in call stream */
183 	u32		serial;		/* serial number of pkt sent to network */
184 	u8		type;		/* packet type */
185 	u8		flags;		/* packet flags */
186 	u8		userStatus;	/* app-layer defined status */
187 	u8		securityIndex;	/* security protocol ID */
188 	union {
189 		u16	_rsvd;		/* reserved */
190 		u16	cksum;		/* kerberos security checksum */
191 	};
192 	u16		serviceId;	/* service ID */
193 } __packed;
194 
195 /*
196  * RxRPC socket buffer private variables
197  * - max 48 bytes (struct sk_buff::cb)
198  */
199 struct rxrpc_skb_priv {
200 	struct rxrpc_connection *conn;	/* Connection referred to (poke packet) */
201 	union {
202 		struct {
203 			u16		offset;		/* Offset of data */
204 			u16		len;		/* Length of data */
205 			u8		flags;
206 #define RXRPC_RX_VERIFIED	0x01
207 		};
208 		struct {
209 			rxrpc_seq_t	first_ack;	/* First packet in acks table */
210 			u8		nr_acks;	/* Number of acks+nacks */
211 			u8		nr_nacks;	/* Number of nacks */
212 		};
213 	};
214 	struct rxrpc_host_header hdr;	/* RxRPC packet header from this packet */
215 };
216 
217 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
218 
219 /*
220  * RxRPC security module interface
221  */
222 struct rxrpc_security {
223 	const char		*name;		/* name of this service */
224 	u8			security_index;	/* security type provided */
225 	u32			no_key_abort;	/* Abort code indicating no key */
226 
227 	/* Initialise a security service */
228 	int (*init)(void);
229 
230 	/* Clean up a security service */
231 	void (*exit)(void);
232 
233 	/* Parse the information from a server key */
234 	int (*preparse_server_key)(struct key_preparsed_payload *);
235 
236 	/* Clean up the preparse buffer after parsing a server key */
237 	void (*free_preparse_server_key)(struct key_preparsed_payload *);
238 
239 	/* Destroy the payload of a server key */
240 	void (*destroy_server_key)(struct key *);
241 
242 	/* Describe a server key */
243 	void (*describe_server_key)(const struct key *, struct seq_file *);
244 
245 	/* initialise a connection's security */
246 	int (*init_connection_security)(struct rxrpc_connection *,
247 					struct rxrpc_key_token *);
248 
249 	/* Work out how much data we can store in a packet, given an estimate
250 	 * of the amount of data remaining.
251 	 */
252 	int (*how_much_data)(struct rxrpc_call *, size_t,
253 			     size_t *, size_t *, size_t *);
254 
255 	/* impose security on a packet */
256 	int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *);
257 
258 	/* verify the security on a received packet */
259 	int (*verify_packet)(struct rxrpc_call *, struct sk_buff *);
260 
261 	/* Free crypto request on a call */
262 	void (*free_call_crypto)(struct rxrpc_call *);
263 
264 	/* issue a challenge */
265 	int (*issue_challenge)(struct rxrpc_connection *);
266 
267 	/* respond to a challenge */
268 	int (*respond_to_challenge)(struct rxrpc_connection *,
269 				    struct sk_buff *);
270 
271 	/* verify a response */
272 	int (*verify_response)(struct rxrpc_connection *,
273 			       struct sk_buff *);
274 
275 	/* clear connection security */
276 	void (*clear)(struct rxrpc_connection *);
277 };
278 
279 /*
280  * RxRPC local transport endpoint description
281  * - owned by a single AF_RXRPC socket
282  * - pointed to by transport socket struct sk_user_data
283  */
284 struct rxrpc_local {
285 	struct rcu_head		rcu;
286 	atomic_t		active_users;	/* Number of users of the local endpoint */
287 	refcount_t		ref;		/* Number of references to the structure */
288 	struct net		*net;		/* The network namespace */
289 	struct rxrpc_net	*rxnet;		/* Our bits in the network namespace */
290 	struct hlist_node	link;
291 	struct socket		*socket;	/* my UDP socket */
292 	struct task_struct	*io_thread;
293 	struct completion	io_thread_ready; /* Indication that the I/O thread started */
294 	struct rxrpc_sock	*service;	/* Service(s) listening on this endpoint */
295 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
296 	struct sk_buff_head	rx_delay_queue;	/* Delay injection queue */
297 #endif
298 	struct sk_buff_head	rx_queue;	/* Received packets */
299 	struct list_head	conn_attend_q;	/* Conns requiring immediate attention */
300 	struct list_head	call_attend_q;	/* Calls requiring immediate attention */
301 
302 	struct rb_root		client_bundles;	/* Client connection bundles by socket params */
303 	spinlock_t		client_bundles_lock; /* Lock for client_bundles */
304 	bool			kill_all_client_conns;
305 	struct list_head	idle_client_conns;
306 	struct timer_list	client_conn_reap_timer;
307 	unsigned long		client_conn_flags;
308 #define RXRPC_CLIENT_CONN_REAP_TIMER	0	/* The client conn reap timer expired */
309 
310 	spinlock_t		lock;		/* access lock */
311 	rwlock_t		services_lock;	/* lock for services list */
312 	int			debug_id;	/* debug ID for printks */
313 	bool			dead;
314 	bool			service_closed;	/* Service socket closed */
315 	struct idr		conn_ids;	/* List of connection IDs */
316 	struct list_head	new_client_calls; /* Newly created client calls need connection */
317 	spinlock_t		client_call_lock; /* Lock for ->new_client_calls */
318 	struct sockaddr_rxrpc	srx;		/* local address */
319 };
320 
321 /*
322  * RxRPC remote transport endpoint definition
323  * - matched by local endpoint, remote port, address and protocol type
324  */
325 struct rxrpc_peer {
326 	struct rcu_head		rcu;		/* This must be first */
327 	refcount_t		ref;
328 	unsigned long		hash_key;
329 	struct hlist_node	hash_link;
330 	struct rxrpc_local	*local;
331 	struct hlist_head	error_targets;	/* targets for net error distribution */
332 	struct rb_root		service_conns;	/* Service connections */
333 	struct list_head	keepalive_link;	/* Link in net->peer_keepalive[] */
334 	time64_t		last_tx_at;	/* Last time packet sent here */
335 	seqlock_t		service_conn_lock;
336 	spinlock_t		lock;		/* access lock */
337 	unsigned int		if_mtu;		/* interface MTU for this peer */
338 	unsigned int		mtu;		/* network MTU for this peer */
339 	unsigned int		maxdata;	/* data size (MTU - hdrsize) */
340 	unsigned short		hdrsize;	/* header size (IP + UDP + RxRPC) */
341 	int			debug_id;	/* debug ID for printks */
342 	struct sockaddr_rxrpc	srx;		/* remote address */
343 
344 	/* calculated RTT cache */
345 #define RXRPC_RTT_CACHE_SIZE 32
346 	spinlock_t		rtt_input_lock;	/* RTT lock for input routine */
347 	ktime_t			rtt_last_req;	/* Time of last RTT request */
348 	unsigned int		rtt_count;	/* Number of samples we've got */
349 
350 	u32			srtt_us;	/* smoothed round trip time << 3 in usecs */
351 	u32			mdev_us;	/* medium deviation			*/
352 	u32			mdev_max_us;	/* maximal mdev for the last rtt period	*/
353 	u32			rttvar_us;	/* smoothed mdev_max			*/
354 	u32			rto_j;		/* Retransmission timeout in jiffies */
355 	u8			backoff;	/* Backoff timeout */
356 
357 	u8			cong_ssthresh;	/* Congestion slow-start threshold */
358 };
359 
360 /*
361  * Keys for matching a connection.
362  */
363 struct rxrpc_conn_proto {
364 	union {
365 		struct {
366 			u32	epoch;		/* epoch of this connection */
367 			u32	cid;		/* connection ID */
368 		};
369 		u64		index_key;
370 	};
371 };
372 
373 struct rxrpc_conn_parameters {
374 	struct rxrpc_local	*local;		/* Representation of local endpoint */
375 	struct key		*key;		/* Security details */
376 	bool			exclusive;	/* T if conn is exclusive */
377 	bool			upgrade;	/* T if service ID can be upgraded */
378 	u16			service_id;	/* Service ID for this connection */
379 	u32			security_level;	/* Security level selected */
380 };
381 
382 /*
383  * Call completion condition (state == RXRPC_CALL_COMPLETE).
384  */
385 enum rxrpc_call_completion {
386 	RXRPC_CALL_SUCCEEDED,		/* - Normal termination */
387 	RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
388 	RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
389 	RXRPC_CALL_LOCAL_ERROR,		/* - call failed due to local error */
390 	RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
391 	NR__RXRPC_CALL_COMPLETIONS
392 };
393 
394 /*
395  * Bits in the connection flags.
396  */
397 enum rxrpc_conn_flag {
398 	RXRPC_CONN_IN_SERVICE_CONNS,	/* Conn is in peer->service_conns */
399 	RXRPC_CONN_DONT_REUSE,		/* Don't reuse this connection */
400 	RXRPC_CONN_PROBING_FOR_UPGRADE,	/* Probing for service upgrade */
401 	RXRPC_CONN_FINAL_ACK_0,		/* Need final ACK for channel 0 */
402 	RXRPC_CONN_FINAL_ACK_1,		/* Need final ACK for channel 1 */
403 	RXRPC_CONN_FINAL_ACK_2,		/* Need final ACK for channel 2 */
404 	RXRPC_CONN_FINAL_ACK_3,		/* Need final ACK for channel 3 */
405 };
406 
407 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |	\
408 				   (1UL << RXRPC_CONN_FINAL_ACK_1) |	\
409 				   (1UL << RXRPC_CONN_FINAL_ACK_2) |	\
410 				   (1UL << RXRPC_CONN_FINAL_ACK_3))
411 
412 /*
413  * Events that can be raised upon a connection.
414  */
415 enum rxrpc_conn_event {
416 	RXRPC_CONN_EV_CHALLENGE,	/* Send challenge packet */
417 	RXRPC_CONN_EV_ABORT_CALLS,	/* Abort attached calls */
418 };
419 
420 /*
421  * The connection protocol state.
422  */
423 enum rxrpc_conn_proto_state {
424 	RXRPC_CONN_UNUSED,		/* Connection not yet attempted */
425 	RXRPC_CONN_CLIENT_UNSECURED,	/* Client connection needs security init */
426 	RXRPC_CONN_CLIENT,		/* Client connection */
427 	RXRPC_CONN_SERVICE_PREALLOC,	/* Service connection preallocation */
428 	RXRPC_CONN_SERVICE_UNSECURED,	/* Service unsecured connection */
429 	RXRPC_CONN_SERVICE_CHALLENGING,	/* Service challenging for security */
430 	RXRPC_CONN_SERVICE,		/* Service secured connection */
431 	RXRPC_CONN_ABORTED,		/* Conn aborted */
432 	RXRPC_CONN__NR_STATES
433 };
434 
435 /*
436  * RxRPC client connection bundle.
437  */
438 struct rxrpc_bundle {
439 	struct rxrpc_local	*local;		/* Representation of local endpoint */
440 	struct rxrpc_peer	*peer;		/* Remote endpoint */
441 	struct key		*key;		/* Security details */
442 	const struct rxrpc_security *security;	/* applied security module */
443 	refcount_t		ref;
444 	atomic_t		active;		/* Number of active users */
445 	unsigned int		debug_id;
446 	u32			security_level;	/* Security level selected */
447 	u16			service_id;	/* Service ID for this connection */
448 	bool			try_upgrade;	/* True if the bundle is attempting upgrade */
449 	bool			exclusive;	/* T if conn is exclusive */
450 	bool			upgrade;	/* T if service ID can be upgraded */
451 	unsigned short		alloc_error;	/* Error from last conn allocation */
452 	struct rb_node		local_node;	/* Node in local->client_conns */
453 	struct list_head	waiting_calls;	/* Calls waiting for channels */
454 	unsigned long		avail_chans;	/* Mask of available channels */
455 	struct rxrpc_connection	*conns[4];	/* The connections in the bundle (max 4) */
456 };
457 
458 /*
459  * RxRPC connection definition
460  * - matched by { local, peer, epoch, conn_id, direction }
461  * - each connection can only handle four simultaneous calls
462  */
463 struct rxrpc_connection {
464 	struct rxrpc_conn_proto	proto;
465 	struct rxrpc_local	*local;		/* Representation of local endpoint */
466 	struct rxrpc_peer	*peer;		/* Remote endpoint */
467 	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
468 	struct key		*key;		/* Security details */
469 	struct list_head	attend_link;	/* Link in local->conn_attend_q */
470 
471 	refcount_t		ref;
472 	atomic_t		active;		/* Active count for service conns */
473 	struct rcu_head		rcu;
474 	struct list_head	cache_link;
475 
476 	unsigned char		act_chans;	/* Mask of active channels */
477 	struct rxrpc_channel {
478 		unsigned long		final_ack_at;	/* Time at which to issue final ACK */
479 		struct rxrpc_call	*call;		/* Active call */
480 		unsigned int		call_debug_id;	/* call->debug_id */
481 		u32			call_id;	/* ID of current call */
482 		u32			call_counter;	/* Call ID counter */
483 		u32			last_call;	/* ID of last call */
484 		u8			last_type;	/* Type of last packet */
485 		union {
486 			u32		last_seq;
487 			u32		last_abort;
488 		};
489 	} channels[RXRPC_MAXCALLS];
490 
491 	struct timer_list	timer;		/* Conn event timer */
492 	struct work_struct	processor;	/* connection event processor */
493 	struct work_struct	destructor;	/* In-process-context destroyer */
494 	struct rxrpc_bundle	*bundle;	/* Client connection bundle */
495 	struct rb_node		service_node;	/* Node in peer->service_conns */
496 	struct list_head	proc_link;	/* link in procfs list */
497 	struct list_head	link;		/* link in master connection list */
498 	struct sk_buff_head	rx_queue;	/* received conn-level packets */
499 
500 	struct mutex		security_lock;	/* Lock for security management */
501 	const struct rxrpc_security *security;	/* applied security module */
502 	union {
503 		struct {
504 			struct crypto_sync_skcipher *cipher;	/* encryption handle */
505 			struct rxrpc_crypt csum_iv;	/* packet checksum base */
506 			u32	nonce;		/* response re-use preventer */
507 		} rxkad;
508 	};
509 	unsigned long		flags;
510 	unsigned long		events;
511 	unsigned long		idle_timestamp;	/* Time at which last became idle */
512 	spinlock_t		state_lock;	/* state-change lock */
513 	enum rxrpc_conn_proto_state state;	/* current state of connection */
514 	enum rxrpc_call_completion completion;	/* Completion condition */
515 	s32			abort_code;	/* Abort code of connection abort */
516 	int			debug_id;	/* debug ID for printks */
517 	rxrpc_serial_t		tx_serial;	/* Outgoing packet serial number counter */
518 	unsigned int		hi_serial;	/* highest serial number received */
519 	u32			service_id;	/* Service ID, possibly upgraded */
520 	u32			security_level;	/* Security level selected */
521 	u8			security_ix;	/* security type */
522 	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
523 	u8			bundle_shift;	/* Index into bundle->avail_chans */
524 	bool			exclusive;	/* T if conn is exclusive */
525 	bool			upgrade;	/* T if service ID can be upgraded */
526 	u16			orig_service_id; /* Originally requested service ID */
527 	short			error;		/* Local error code */
528 };
529 
530 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
531 {
532 	return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
533 }
534 
535 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
536 {
537 	return !rxrpc_to_server(sp);
538 }
539 
540 /*
541  * Flags in call->flags.
542  */
543 enum rxrpc_call_flag {
544 	RXRPC_CALL_RELEASED,		/* call has been released - no more message to userspace */
545 	RXRPC_CALL_HAS_USERID,		/* has a user ID attached */
546 	RXRPC_CALL_IS_SERVICE,		/* Call is service call */
547 	RXRPC_CALL_EXPOSED,		/* The call was exposed to the world */
548 	RXRPC_CALL_RX_LAST,		/* Received the last packet (at rxtx_top) */
549 	RXRPC_CALL_TX_LAST,		/* Last packet in Tx buffer (at rxtx_top) */
550 	RXRPC_CALL_TX_ALL_ACKED,	/* Last packet has been hard-acked */
551 	RXRPC_CALL_SEND_PING,		/* A ping will need to be sent */
552 	RXRPC_CALL_RETRANS_TIMEOUT,	/* Retransmission due to timeout occurred */
553 	RXRPC_CALL_BEGAN_RX_TIMER,	/* We began the expect_rx_by timer */
554 	RXRPC_CALL_RX_HEARD,		/* The peer responded at least once to this call */
555 	RXRPC_CALL_DISCONNECTED,	/* The call has been disconnected */
556 	RXRPC_CALL_KERNEL,		/* The call was made by the kernel */
557 	RXRPC_CALL_UPGRADE,		/* Service upgrade was requested for the call */
558 	RXRPC_CALL_EXCLUSIVE,		/* The call uses a once-only connection */
559 	RXRPC_CALL_RX_IS_IDLE,		/* recvmsg() is idle - send an ACK */
560 	RXRPC_CALL_RECVMSG_READ_ALL,	/* recvmsg() read all of the received data */
561 };
562 
563 /*
564  * Events that can be raised on a call.
565  */
566 enum rxrpc_call_event {
567 	RXRPC_CALL_EV_ACK_LOST,		/* ACK may be lost, send ping */
568 	RXRPC_CALL_EV_INITIAL_PING,	/* Send initial ping for a new service call */
569 };
570 
571 /*
572  * The states that a call can be in.
573  */
574 enum rxrpc_call_state {
575 	RXRPC_CALL_UNINITIALISED,
576 	RXRPC_CALL_CLIENT_AWAIT_CONN,	/* - client waiting for connection to become available */
577 	RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
578 	RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
579 	RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
580 	RXRPC_CALL_SERVER_PREALLOC,	/* - service preallocation */
581 	RXRPC_CALL_SERVER_SECURING,	/* - server securing request connection */
582 	RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
583 	RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
584 	RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
585 	RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
586 	RXRPC_CALL_COMPLETE,		/* - call complete */
587 	NR__RXRPC_CALL_STATES
588 };
589 
590 /*
591  * Call Tx congestion management modes.
592  */
593 enum rxrpc_congest_mode {
594 	RXRPC_CALL_SLOW_START,
595 	RXRPC_CALL_CONGEST_AVOIDANCE,
596 	RXRPC_CALL_PACKET_LOSS,
597 	RXRPC_CALL_FAST_RETRANSMIT,
598 	NR__RXRPC_CONGEST_MODES
599 };
600 
601 /*
602  * RxRPC call definition
603  * - matched by { connection, call_id }
604  */
605 struct rxrpc_call {
606 	struct rcu_head		rcu;
607 	struct rxrpc_connection	*conn;		/* connection carrying call */
608 	struct rxrpc_bundle	*bundle;	/* Connection bundle to use */
609 	struct rxrpc_peer	*peer;		/* Peer record for remote address */
610 	struct rxrpc_local	*local;		/* Representation of local endpoint */
611 	struct rxrpc_sock __rcu	*socket;	/* socket responsible */
612 	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
613 	struct key		*key;		/* Security details */
614 	const struct rxrpc_security *security;	/* applied security module */
615 	struct mutex		user_mutex;	/* User access mutex */
616 	struct sockaddr_rxrpc	dest_srx;	/* Destination address */
617 	unsigned long		delay_ack_at;	/* When DELAY ACK needs to happen */
618 	unsigned long		ack_lost_at;	/* When ACK is figured as lost */
619 	unsigned long		resend_at;	/* When next resend needs to happen */
620 	unsigned long		ping_at;	/* When next to send a ping */
621 	unsigned long		keepalive_at;	/* When next to send a keepalive ping */
622 	unsigned long		expect_rx_by;	/* When we expect to get a packet by */
623 	unsigned long		expect_req_by;	/* When we expect to get a request DATA packet by */
624 	unsigned long		expect_term_by;	/* When we expect call termination by */
625 	u32			next_rx_timo;	/* Timeout for next Rx packet (jif) */
626 	u32			next_req_timo;	/* Timeout for next Rx request packet (jif) */
627 	u32			hard_timo;	/* Maximum lifetime or 0 (jif) */
628 	struct timer_list	timer;		/* Combined event timer */
629 	struct work_struct	destroyer;	/* In-process-context destroyer */
630 	rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
631 	struct list_head	link;		/* link in master call list */
632 	struct list_head	wait_link;	/* Link in local->new_client_calls */
633 	struct hlist_node	error_link;	/* link in error distribution list */
634 	struct list_head	accept_link;	/* Link in rx->acceptq */
635 	struct list_head	recvmsg_link;	/* Link in rx->recvmsg_q */
636 	struct list_head	sock_link;	/* Link in rx->sock_calls */
637 	struct rb_node		sock_node;	/* Node in rx->calls */
638 	struct list_head	attend_link;	/* Link in local->call_attend_q */
639 	struct rxrpc_txbuf	*tx_pending;	/* Tx buffer being filled */
640 	wait_queue_head_t	waitq;		/* Wait queue for channel or Tx */
641 	s64			tx_total_len;	/* Total length left to be transmitted (or -1) */
642 	unsigned long		user_call_ID;	/* user-defined call ID */
643 	unsigned long		flags;
644 	unsigned long		events;
645 	spinlock_t		notify_lock;	/* Kernel notification lock */
646 	unsigned int		send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */
647 	s32			send_abort;	/* Abort code to be sent */
648 	short			send_abort_err;	/* Error to be associated with the abort */
649 	rxrpc_seq_t		send_abort_seq;	/* DATA packet that incurred the abort (or 0) */
650 	s32			abort_code;	/* Local/remote abort code */
651 	int			error;		/* Local error incurred */
652 	enum rxrpc_call_state	_state;		/* Current state of call (needs barrier) */
653 	enum rxrpc_call_completion completion;	/* Call completion condition */
654 	refcount_t		ref;
655 	u8			security_ix;	/* Security type */
656 	enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */
657 	u32			call_id;	/* call ID on connection  */
658 	u32			cid;		/* connection ID plus channel index */
659 	u32			security_level;	/* Security level selected */
660 	int			debug_id;	/* debug ID for printks */
661 	unsigned short		rx_pkt_offset;	/* Current recvmsg packet offset */
662 	unsigned short		rx_pkt_len;	/* Current recvmsg packet len */
663 
664 	/* Transmitted data tracking. */
665 	spinlock_t		tx_lock;	/* Transmit queue lock */
666 	struct list_head	tx_sendmsg;	/* Sendmsg prepared packets */
667 	struct list_head	tx_buffer;	/* Buffer of transmissible packets */
668 	rxrpc_seq_t		tx_bottom;	/* First packet in buffer */
669 	rxrpc_seq_t		tx_transmitted;	/* Highest packet transmitted */
670 	rxrpc_seq_t		tx_prepared;	/* Highest Tx slot prepared. */
671 	rxrpc_seq_t		tx_top;		/* Highest Tx slot allocated. */
672 	u16			tx_backoff;	/* Delay to insert due to Tx failure */
673 	u8			tx_winsize;	/* Maximum size of Tx window */
674 #define RXRPC_TX_MAX_WINDOW	128
675 	ktime_t			tx_last_sent;	/* Last time a transmission occurred */
676 
677 	/* Received data tracking */
678 	struct sk_buff_head	recvmsg_queue;	/* Queue of packets ready for recvmsg() */
679 	struct sk_buff_head	rx_oos_queue;	/* Queue of out of sequence packets */
680 
681 	rxrpc_seq_t		rx_highest_seq;	/* Higest sequence number received */
682 	rxrpc_seq_t		rx_consumed;	/* Highest packet consumed */
683 	rxrpc_serial_t		rx_serial;	/* Highest serial received for this call */
684 	u8			rx_winsize;	/* Size of Rx window */
685 
686 	/* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
687 	 * is fixed, we keep these numbers in terms of segments (ie. DATA
688 	 * packets) rather than bytes.
689 	 */
690 #define RXRPC_TX_SMSS		RXRPC_JUMBO_DATALEN
691 #define RXRPC_MIN_CWND		4
692 	u8			cong_cwnd;	/* Congestion window size */
693 	u8			cong_extra;	/* Extra to send for congestion management */
694 	u8			cong_ssthresh;	/* Slow-start threshold */
695 	enum rxrpc_congest_mode	cong_mode:8;	/* Congestion management mode */
696 	u8			cong_dup_acks;	/* Count of ACKs showing missing packets */
697 	u8			cong_cumul_acks; /* Cumulative ACK count */
698 	ktime_t			cong_tstamp;	/* Last time cwnd was changed */
699 	struct sk_buff		*cong_last_nack; /* Last ACK with nacks received */
700 
701 	/* Receive-phase ACK management (ACKs we send). */
702 	u8			ackr_reason;	/* reason to ACK */
703 	u16			ackr_sack_base;	/* Starting slot in SACK table ring */
704 	rxrpc_seq_t		ackr_window;	/* Base of SACK window */
705 	rxrpc_seq_t		ackr_wtop;	/* Base of SACK window */
706 	unsigned int		ackr_nr_unacked; /* Number of unacked packets */
707 	atomic_t		ackr_nr_consumed; /* Number of packets needing hard ACK */
708 	struct {
709 #define RXRPC_SACK_SIZE 256
710 		 /* SACK table for soft-acked packets */
711 		u8		ackr_sack_table[RXRPC_SACK_SIZE];
712 	} __aligned(8);
713 
714 	/* RTT management */
715 	rxrpc_serial_t		rtt_serial[4];	/* Serial number of DATA or PING sent */
716 	ktime_t			rtt_sent_at[4];	/* Time packet sent */
717 	unsigned long		rtt_avail;	/* Mask of available slots in bits 0-3,
718 						 * Mask of pending samples in 8-11 */
719 #define RXRPC_CALL_RTT_AVAIL_MASK	0xf
720 #define RXRPC_CALL_RTT_PEND_SHIFT	8
721 
722 	/* Transmission-phase ACK management (ACKs we've received). */
723 	ktime_t			acks_latest_ts;	/* Timestamp of latest ACK received */
724 	rxrpc_seq_t		acks_first_seq;	/* first sequence number received */
725 	rxrpc_seq_t		acks_prev_seq;	/* Highest previousPacket received */
726 	rxrpc_seq_t		acks_hard_ack;	/* Latest hard-ack point */
727 	rxrpc_seq_t		acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
728 	rxrpc_serial_t		acks_highest_serial; /* Highest serial number ACK'd */
729 };
730 
731 /*
732  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
733  */
734 struct rxrpc_ack_summary {
735 	u16			nr_acks;		/* Number of ACKs in packet */
736 	u16			nr_new_acks;		/* Number of new ACKs in packet */
737 	u16			nr_new_nacks;		/* Number of new nacks in packet */
738 	u16			nr_retained_nacks;	/* Number of nacks retained between ACKs */
739 	u8			ack_reason;
740 	bool			saw_nacks;		/* Saw NACKs in packet */
741 	bool			new_low_nack;		/* T if new low NACK found */
742 	bool			retrans_timeo;		/* T if reTx due to timeout happened */
743 	u8			flight_size;		/* Number of unreceived transmissions */
744 	/* Place to stash values for tracing */
745 	enum rxrpc_congest_mode	mode:8;
746 	u8			cwnd;
747 	u8			ssthresh;
748 	u8			dup_acks;
749 	u8			cumulative_acks;
750 };
751 
752 /*
753  * sendmsg() cmsg-specified parameters.
754  */
755 enum rxrpc_command {
756 	RXRPC_CMD_SEND_DATA,		/* send data message */
757 	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
758 	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
759 	RXRPC_CMD_CHARGE_ACCEPT,	/* [server] charge accept preallocation */
760 };
761 
762 struct rxrpc_call_params {
763 	s64			tx_total_len;	/* Total Tx data length (if send data) */
764 	unsigned long		user_call_ID;	/* User's call ID */
765 	struct {
766 		u32		hard;		/* Maximum lifetime (sec) */
767 		u32		idle;		/* Max time since last data packet (msec) */
768 		u32		normal;		/* Max time since last call packet (msec) */
769 	} timeouts;
770 	u8			nr_timeouts;	/* Number of timeouts specified */
771 	bool			kernel;		/* T if kernel is making the call */
772 	enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */
773 };
774 
775 struct rxrpc_send_params {
776 	struct rxrpc_call_params call;
777 	u32			abort_code;	/* Abort code to Tx (if abort) */
778 	enum rxrpc_command	command : 8;	/* The command to implement */
779 	bool			exclusive;	/* Shared or exclusive call */
780 	bool			upgrade;	/* If the connection is upgradeable */
781 };
782 
783 /*
784  * Buffer of data to be output as a packet.
785  */
786 struct rxrpc_txbuf {
787 	struct rcu_head		rcu;
788 	struct list_head	call_link;	/* Link in call->tx_sendmsg/tx_buffer */
789 	struct list_head	tx_link;	/* Link in live Enc queue or Tx queue */
790 	ktime_t			last_sent;	/* Time at which last transmitted */
791 	refcount_t		ref;
792 	rxrpc_seq_t		seq;		/* Sequence number of this packet */
793 	unsigned int		call_debug_id;
794 	unsigned int		debug_id;
795 	unsigned int		len;		/* Amount of data in buffer */
796 	unsigned int		space;		/* Remaining data space */
797 	unsigned int		offset;		/* Offset of fill point */
798 	unsigned long		flags;
799 #define RXRPC_TXBUF_LAST	0		/* Set if last packet in Tx phase */
800 #define RXRPC_TXBUF_RESENT	1		/* Set if has been resent */
801 	u8 /*enum rxrpc_propose_ack_trace*/ ack_why;	/* If ack, why */
802 	struct {
803 		/* The packet for encrypting and DMA'ing.  We align it such
804 		 * that data[] aligns correctly for any crypto blocksize.
805 		 */
806 		u8		pad[64 - sizeof(struct rxrpc_wire_header)];
807 		struct rxrpc_wire_header wire;	/* Network-ready header */
808 		union {
809 			u8	data[RXRPC_JUMBO_DATALEN]; /* Data packet */
810 			struct {
811 				struct rxrpc_ackpacket ack;
812 				DECLARE_FLEX_ARRAY(u8, acks);
813 			};
814 		};
815 	} __aligned(64);
816 };
817 
818 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb)
819 {
820 	return txb->wire.flags & RXRPC_CLIENT_INITIATED;
821 }
822 
823 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb)
824 {
825 	return !rxrpc_sending_to_server(txb);
826 }
827 
828 #include <trace/events/rxrpc.h>
829 
830 /*
831  * Allocate the next serial number on a connection.  0 must be skipped.
832  */
833 static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn)
834 {
835 	rxrpc_serial_t serial;
836 
837 	serial = conn->tx_serial;
838 	if (serial == 0)
839 		serial = 1;
840 	conn->tx_serial = serial + 1;
841 	return serial;
842 }
843 
844 /*
845  * af_rxrpc.c
846  */
847 extern atomic_t rxrpc_n_rx_skbs;
848 extern struct workqueue_struct *rxrpc_workqueue;
849 
850 /*
851  * call_accept.c
852  */
853 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
854 void rxrpc_discard_prealloc(struct rxrpc_sock *);
855 bool rxrpc_new_incoming_call(struct rxrpc_local *local,
856 			     struct rxrpc_peer *peer,
857 			     struct rxrpc_connection *conn,
858 			     struct sockaddr_rxrpc *peer_srx,
859 			     struct sk_buff *skb);
860 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
861 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long);
862 
863 /*
864  * call_event.c
865  */
866 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial,
867 			enum rxrpc_propose_ack_trace why);
868 void rxrpc_send_ACK(struct rxrpc_call *, u8, rxrpc_serial_t, enum rxrpc_propose_ack_trace);
869 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t,
870 			     enum rxrpc_propose_ack_trace);
871 void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *);
872 void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb);
873 
874 void rxrpc_reduce_call_timer(struct rxrpc_call *call,
875 			     unsigned long expire_at,
876 			     unsigned long now,
877 			     enum rxrpc_timer_trace why);
878 
879 bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb);
880 
881 /*
882  * call_object.c
883  */
884 extern const char *const rxrpc_call_states[];
885 extern const char *const rxrpc_call_completions[];
886 extern struct kmem_cache *rxrpc_call_jar;
887 
888 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what);
889 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
890 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
891 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
892 					 struct rxrpc_conn_parameters *,
893 					 struct sockaddr_rxrpc *,
894 					 struct rxrpc_call_params *, gfp_t,
895 					 unsigned int);
896 void rxrpc_start_call_timer(struct rxrpc_call *call);
897 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
898 			 struct sk_buff *);
899 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
900 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
901 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace);
902 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
903 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
904 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
905 void rxrpc_cleanup_call(struct rxrpc_call *);
906 void rxrpc_destroy_all_calls(struct rxrpc_net *);
907 
908 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
909 {
910 	return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
911 }
912 
913 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
914 {
915 	return !rxrpc_is_service_call(call);
916 }
917 
918 /*
919  * call_state.c
920  */
921 bool rxrpc_set_call_completion(struct rxrpc_call *call,
922 			       enum rxrpc_call_completion compl,
923 			       u32 abort_code,
924 			       int error);
925 bool rxrpc_call_completed(struct rxrpc_call *call);
926 bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
927 		      u32 abort_code, int error, enum rxrpc_abort_reason why);
928 void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl,
929 			int error);
930 
931 static inline void rxrpc_set_call_state(struct rxrpc_call *call,
932 					enum rxrpc_call_state state)
933 {
934 	/* Order write of completion info before write of ->state. */
935 	smp_store_release(&call->_state, state);
936 	wake_up(&call->waitq);
937 }
938 
939 static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call)
940 {
941 	return call->_state; /* Only inside I/O thread */
942 }
943 
944 static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call)
945 {
946 	return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
947 }
948 
949 static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call)
950 {
951 	/* Order read ->state before read of completion info. */
952 	return smp_load_acquire(&call->_state);
953 }
954 
955 static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call)
956 {
957 	return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
958 }
959 
960 static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call)
961 {
962 	return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED;
963 }
964 
965 /*
966  * conn_client.c
967  */
968 extern unsigned int rxrpc_reap_client_connections;
969 extern unsigned long rxrpc_conn_idle_client_expiry;
970 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
971 
972 void rxrpc_purge_client_connections(struct rxrpc_local *local);
973 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
974 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
975 int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp);
976 void rxrpc_connect_client_calls(struct rxrpc_local *local);
977 void rxrpc_expose_client_call(struct rxrpc_call *);
978 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *);
979 void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle);
980 void rxrpc_put_client_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
981 void rxrpc_discard_expired_client_conns(struct rxrpc_local *local);
982 void rxrpc_clean_up_local_conns(struct rxrpc_local *);
983 
984 /*
985  * conn_event.c
986  */
987 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb,
988 				unsigned int channel);
989 int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb,
990 		     s32 abort_code, int err, enum rxrpc_abort_reason why);
991 void rxrpc_process_connection(struct work_struct *);
992 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
993 bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb);
994 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb);
995 
996 static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn)
997 {
998 	/* Order reading the abort info after the state check. */
999 	return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED;
1000 }
1001 
1002 /*
1003  * conn_object.c
1004  */
1005 extern unsigned int rxrpc_connection_expiry;
1006 extern unsigned int rxrpc_closed_conn_expiry;
1007 
1008 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why);
1009 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t);
1010 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *,
1011 							  struct sockaddr_rxrpc *,
1012 							  struct sk_buff *);
1013 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
1014 void rxrpc_disconnect_call(struct rxrpc_call *);
1015 void rxrpc_kill_client_conn(struct rxrpc_connection *);
1016 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
1017 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1018 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *,
1019 					      enum rxrpc_conn_trace);
1020 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *,
1021 						    enum rxrpc_conn_trace);
1022 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1023 void rxrpc_service_connection_reaper(struct work_struct *);
1024 void rxrpc_destroy_all_connections(struct rxrpc_net *);
1025 
1026 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
1027 {
1028 	return conn->out_clientflag;
1029 }
1030 
1031 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
1032 {
1033 	return !rxrpc_conn_is_client(conn);
1034 }
1035 
1036 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
1037 					   unsigned long expire_at)
1038 {
1039 	timer_reduce(&conn->timer, expire_at);
1040 }
1041 
1042 /*
1043  * conn_service.c
1044  */
1045 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
1046 						     struct sk_buff *);
1047 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
1048 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *,
1049 				   const struct rxrpc_security *, struct sk_buff *);
1050 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
1051 
1052 /*
1053  * input.c
1054  */
1055 void rxrpc_congestion_degrade(struct rxrpc_call *);
1056 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *);
1057 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *);
1058 
1059 /*
1060  * io_thread.c
1061  */
1062 int rxrpc_encap_rcv(struct sock *, struct sk_buff *);
1063 void rxrpc_error_report(struct sock *);
1064 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
1065 			s32 abort_code, int err);
1066 int rxrpc_io_thread(void *data);
1067 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local)
1068 {
1069 	wake_up_process(local->io_thread);
1070 }
1071 
1072 static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why)
1073 {
1074 	return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO);
1075 }
1076 
1077 /*
1078  * insecure.c
1079  */
1080 extern const struct rxrpc_security rxrpc_no_security;
1081 
1082 /*
1083  * key.c
1084  */
1085 extern struct key_type key_type_rxrpc;
1086 
1087 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int);
1088 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
1089 			      u32);
1090 
1091 /*
1092  * local_event.c
1093  */
1094 void rxrpc_gen_version_string(void);
1095 void rxrpc_send_version_request(struct rxrpc_local *local,
1096 				struct rxrpc_host_header *hdr,
1097 				struct sk_buff *skb);
1098 
1099 /*
1100  * local_object.c
1101  */
1102 void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set);
1103 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1104 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace);
1105 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace);
1106 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace);
1107 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace);
1108 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace);
1109 void rxrpc_destroy_local(struct rxrpc_local *local);
1110 void rxrpc_destroy_all_locals(struct rxrpc_net *);
1111 
1112 static inline bool __rxrpc_use_local(struct rxrpc_local *local,
1113 				     enum rxrpc_local_trace why)
1114 {
1115 	int r, u;
1116 
1117 	r = refcount_read(&local->ref);
1118 	u = atomic_fetch_add_unless(&local->active_users, 1, 0);
1119 	trace_rxrpc_local(local->debug_id, why, r, u);
1120 	return u != 0;
1121 }
1122 
1123 static inline void rxrpc_see_local(struct rxrpc_local *local,
1124 				   enum rxrpc_local_trace why)
1125 {
1126 	int r, u;
1127 
1128 	r = refcount_read(&local->ref);
1129 	u = atomic_read(&local->active_users);
1130 	trace_rxrpc_local(local->debug_id, why, r, u);
1131 }
1132 
1133 /*
1134  * misc.c
1135  */
1136 extern unsigned int rxrpc_max_backlog __read_mostly;
1137 extern unsigned long rxrpc_soft_ack_delay;
1138 extern unsigned long rxrpc_idle_ack_delay;
1139 extern unsigned int rxrpc_rx_window_size;
1140 extern unsigned int rxrpc_rx_mtu;
1141 extern unsigned int rxrpc_rx_jumbo_max;
1142 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
1143 extern unsigned long rxrpc_inject_rx_delay;
1144 #endif
1145 
1146 /*
1147  * net_ns.c
1148  */
1149 extern unsigned int rxrpc_net_id;
1150 extern struct pernet_operations rxrpc_net_ops;
1151 
1152 static inline struct rxrpc_net *rxrpc_net(struct net *net)
1153 {
1154 	return net_generic(net, rxrpc_net_id);
1155 }
1156 
1157 /*
1158  * output.c
1159  */
1160 int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
1161 int rxrpc_send_abort_packet(struct rxrpc_call *);
1162 int rxrpc_send_data_packet(struct rxrpc_call *, struct rxrpc_txbuf *);
1163 void rxrpc_send_conn_abort(struct rxrpc_connection *conn);
1164 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb);
1165 void rxrpc_send_keepalive(struct rxrpc_peer *);
1166 void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
1167 
1168 /*
1169  * peer_event.c
1170  */
1171 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *);
1172 void rxrpc_peer_keepalive_worker(struct work_struct *);
1173 
1174 /*
1175  * peer_object.c
1176  */
1177 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1178 					 const struct sockaddr_rxrpc *);
1179 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local,
1180 				     struct sockaddr_rxrpc *srx, gfp_t gfp);
1181 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t,
1182 				    enum rxrpc_peer_trace);
1183 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer);
1184 void rxrpc_destroy_all_peers(struct rxrpc_net *);
1185 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1186 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace);
1187 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1188 
1189 /*
1190  * proc.c
1191  */
1192 extern const struct seq_operations rxrpc_call_seq_ops;
1193 extern const struct seq_operations rxrpc_connection_seq_ops;
1194 extern const struct seq_operations rxrpc_peer_seq_ops;
1195 extern const struct seq_operations rxrpc_local_seq_ops;
1196 
1197 /*
1198  * recvmsg.c
1199  */
1200 void rxrpc_notify_socket(struct rxrpc_call *);
1201 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1202 
1203 /*
1204  * Abort a call due to a protocol error.
1205  */
1206 static inline int rxrpc_abort_eproto(struct rxrpc_call *call,
1207 				     struct sk_buff *skb,
1208 				     s32 abort_code,
1209 				     enum rxrpc_abort_reason why)
1210 {
1211 	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
1212 
1213 	rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why);
1214 	return -EPROTO;
1215 }
1216 
1217 /*
1218  * rtt.c
1219  */
1220 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int,
1221 			rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1222 unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool);
1223 void rxrpc_peer_init_rtt(struct rxrpc_peer *);
1224 
1225 /*
1226  * rxkad.c
1227  */
1228 #ifdef CONFIG_RXKAD
1229 extern const struct rxrpc_security rxkad;
1230 #endif
1231 
1232 /*
1233  * security.c
1234  */
1235 int __init rxrpc_init_security(void);
1236 const struct rxrpc_security *rxrpc_security_lookup(u8);
1237 void rxrpc_exit_security(void);
1238 int rxrpc_init_client_call_security(struct rxrpc_call *);
1239 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1240 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *,
1241 							 struct sk_buff *);
1242 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *,
1243 					  struct sk_buff *, u32, u32);
1244 
1245 /*
1246  * sendmsg.c
1247  */
1248 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error,
1249 			 enum rxrpc_abort_reason why);
1250 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1251 
1252 /*
1253  * server_key.c
1254  */
1255 extern struct key_type key_type_rxrpc_s;
1256 
1257 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int);
1258 
1259 /*
1260  * skbuff.c
1261  */
1262 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1263 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1264 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1265 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
1266 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1267 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1268 void rxrpc_purge_queue(struct sk_buff_head *);
1269 
1270 /*
1271  * stats.c
1272  */
1273 int rxrpc_stats_show(struct seq_file *seq, void *v);
1274 int rxrpc_stats_clear(struct file *file, char *buf, size_t size);
1275 
1276 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s)
1277 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s)
1278 
1279 /*
1280  * sysctl.c
1281  */
1282 #ifdef CONFIG_SYSCTL
1283 extern int __init rxrpc_sysctl_init(void);
1284 extern void rxrpc_sysctl_exit(void);
1285 #else
1286 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1287 static inline void rxrpc_sysctl_exit(void) {}
1288 #endif
1289 
1290 /*
1291  * txbuf.c
1292  */
1293 extern atomic_t rxrpc_nr_txbuf;
1294 struct rxrpc_txbuf *rxrpc_alloc_txbuf(struct rxrpc_call *call, u8 packet_type,
1295 				      gfp_t gfp);
1296 void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1297 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1298 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1299 
1300 /*
1301  * utils.c
1302  */
1303 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1304 
1305 static inline bool before(u32 seq1, u32 seq2)
1306 {
1307         return (s32)(seq1 - seq2) < 0;
1308 }
1309 static inline bool before_eq(u32 seq1, u32 seq2)
1310 {
1311         return (s32)(seq1 - seq2) <= 0;
1312 }
1313 static inline bool after(u32 seq1, u32 seq2)
1314 {
1315         return (s32)(seq1 - seq2) > 0;
1316 }
1317 static inline bool after_eq(u32 seq1, u32 seq2)
1318 {
1319         return (s32)(seq1 - seq2) >= 0;
1320 }
1321 
1322 /*
1323  * debug tracing
1324  */
1325 extern unsigned int rxrpc_debug;
1326 
1327 #define dbgprintk(FMT,...) \
1328 	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1329 
1330 #define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1331 #define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1332 #define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
1333 
1334 
1335 #if defined(__KDEBUG)
1336 #define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
1337 #define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
1338 #define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
1339 
1340 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1341 #define RXRPC_DEBUG_KENTER	0x01
1342 #define RXRPC_DEBUG_KLEAVE	0x02
1343 #define RXRPC_DEBUG_KDEBUG	0x04
1344 
1345 #define _enter(FMT,...)					\
1346 do {							\
1347 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER))	\
1348 		kenter(FMT,##__VA_ARGS__);		\
1349 } while (0)
1350 
1351 #define _leave(FMT,...)					\
1352 do {							\
1353 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE))	\
1354 		kleave(FMT,##__VA_ARGS__);		\
1355 } while (0)
1356 
1357 #define _debug(FMT,...)					\
1358 do {							\
1359 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG))	\
1360 		kdebug(FMT,##__VA_ARGS__);		\
1361 } while (0)
1362 
1363 #else
1364 #define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1365 #define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1366 #define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
1367 #endif
1368 
1369 /*
1370  * debug assertion checking
1371  */
1372 #if 1 // defined(__KDEBUGALL)
1373 
1374 #define ASSERT(X)						\
1375 do {								\
1376 	if (unlikely(!(X))) {					\
1377 		pr_err("Assertion failed\n");			\
1378 		BUG();						\
1379 	}							\
1380 } while (0)
1381 
1382 #define ASSERTCMP(X, OP, Y)						\
1383 do {									\
1384 	__typeof__(X) _x = (X);						\
1385 	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1386 	if (unlikely(!(_x OP _y))) {					\
1387 		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1388 		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1389 		       (unsigned long)_y, (unsigned long)_y);		\
1390 		BUG();							\
1391 	}								\
1392 } while (0)
1393 
1394 #define ASSERTIF(C, X)						\
1395 do {								\
1396 	if (unlikely((C) && !(X))) {				\
1397 		pr_err("Assertion failed\n");			\
1398 		BUG();						\
1399 	}							\
1400 } while (0)
1401 
1402 #define ASSERTIFCMP(C, X, OP, Y)					\
1403 do {									\
1404 	__typeof__(X) _x = (X);						\
1405 	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1406 	if (unlikely((C) && !(_x OP _y))) {				\
1407 		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1408 		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1409 		       (unsigned long)_y, (unsigned long)_y);		\
1410 		BUG();							\
1411 	}								\
1412 } while (0)
1413 
1414 #else
1415 
1416 #define ASSERT(X)				\
1417 do {						\
1418 } while (0)
1419 
1420 #define ASSERTCMP(X, OP, Y)			\
1421 do {						\
1422 } while (0)
1423 
1424 #define ASSERTIF(C, X)				\
1425 do {						\
1426 } while (0)
1427 
1428 #define ASSERTIFCMP(C, X, OP, Y)		\
1429 do {						\
1430 } while (0)
1431 
1432 #endif /* __KDEBUGALL */
1433