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 
33 /*
34  * Mark applied to socket buffers in skb->mark.  skb->priority is used
35  * to pass supplementary information.
36  */
37 enum rxrpc_skb_mark {
38 	RXRPC_SKB_MARK_REJECT_BUSY,	/* Reject with BUSY */
39 	RXRPC_SKB_MARK_REJECT_ABORT,	/* Reject with ABORT (code in skb->priority) */
40 };
41 
42 /*
43  * sk_state for RxRPC sockets
44  */
45 enum {
46 	RXRPC_UNBOUND = 0,
47 	RXRPC_CLIENT_UNBOUND,		/* Unbound socket used as client */
48 	RXRPC_CLIENT_BOUND,		/* client local address bound */
49 	RXRPC_SERVER_BOUND,		/* server local address bound */
50 	RXRPC_SERVER_BOUND2,		/* second server local address bound */
51 	RXRPC_SERVER_LISTENING,		/* server listening for connections */
52 	RXRPC_SERVER_LISTEN_DISABLED,	/* server listening disabled */
53 	RXRPC_CLOSE,			/* socket is being closed */
54 };
55 
56 /*
57  * Per-network namespace data.
58  */
59 struct rxrpc_net {
60 	struct proc_dir_entry	*proc_net;	/* Subdir in /proc/net */
61 	u32			epoch;		/* Local epoch for detecting local-end reset */
62 	struct list_head	calls;		/* List of calls active in this namespace */
63 	spinlock_t		call_lock;	/* Lock for ->calls */
64 	atomic_t		nr_calls;	/* Count of allocated calls */
65 
66 	atomic_t		nr_conns;
67 	struct list_head	conn_proc_list;	/* List of conns in this namespace for proc */
68 	struct list_head	service_conns;	/* Service conns in this namespace */
69 	rwlock_t		conn_lock;	/* Lock for ->conn_proc_list, ->service_conns */
70 	struct work_struct	service_conn_reaper;
71 	struct timer_list	service_conn_reap_timer;
72 
73 	bool			live;
74 
75 	bool			kill_all_client_conns;
76 	atomic_t		nr_client_conns;
77 	spinlock_t		client_conn_cache_lock; /* Lock for ->*_client_conns */
78 	spinlock_t		client_conn_discard_lock; /* Prevent multiple discarders */
79 	struct list_head	idle_client_conns;
80 	struct work_struct	client_conn_reaper;
81 	struct timer_list	client_conn_reap_timer;
82 
83 	struct hlist_head	local_endpoints;
84 	struct mutex		local_mutex;	/* Lock for ->local_endpoints */
85 
86 	DECLARE_HASHTABLE	(peer_hash, 10);
87 	spinlock_t		peer_hash_lock;	/* Lock for ->peer_hash */
88 
89 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
90 	u8			peer_keepalive_cursor;
91 	time64_t		peer_keepalive_base;
92 	struct list_head	peer_keepalive[32];
93 	struct list_head	peer_keepalive_new;
94 	struct timer_list	peer_keepalive_timer;
95 	struct work_struct	peer_keepalive_work;
96 };
97 
98 /*
99  * Service backlog preallocation.
100  *
101  * This contains circular buffers of preallocated peers, connections and calls
102  * for incoming service calls and their head and tail pointers.  This allows
103  * calls to be set up in the data_ready handler, thereby avoiding the need to
104  * shuffle packets around so much.
105  */
106 struct rxrpc_backlog {
107 	unsigned short		peer_backlog_head;
108 	unsigned short		peer_backlog_tail;
109 	unsigned short		conn_backlog_head;
110 	unsigned short		conn_backlog_tail;
111 	unsigned short		call_backlog_head;
112 	unsigned short		call_backlog_tail;
113 #define RXRPC_BACKLOG_MAX	32
114 	struct rxrpc_peer	*peer_backlog[RXRPC_BACKLOG_MAX];
115 	struct rxrpc_connection	*conn_backlog[RXRPC_BACKLOG_MAX];
116 	struct rxrpc_call	*call_backlog[RXRPC_BACKLOG_MAX];
117 };
118 
119 /*
120  * RxRPC socket definition
121  */
122 struct rxrpc_sock {
123 	/* WARNING: sk has to be the first member */
124 	struct sock		sk;
125 	rxrpc_notify_new_call_t	notify_new_call; /* Func to notify of new call */
126 	rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
127 	struct rxrpc_local	*local;		/* local endpoint */
128 	struct rxrpc_backlog	*backlog;	/* Preallocation for services */
129 	spinlock_t		incoming_lock;	/* Incoming call vs service shutdown lock */
130 	struct list_head	sock_calls;	/* List of calls owned by this socket */
131 	struct list_head	to_be_accepted;	/* calls awaiting acceptance */
132 	struct list_head	recvmsg_q;	/* Calls awaiting recvmsg's attention  */
133 	rwlock_t		recvmsg_lock;	/* Lock for recvmsg_q */
134 	struct key		*key;		/* security for this socket */
135 	struct key		*securities;	/* list of server security descriptors */
136 	struct rb_root		calls;		/* User ID -> call mapping */
137 	unsigned long		flags;
138 #define RXRPC_SOCK_CONNECTED		0	/* connect_srx is set */
139 	rwlock_t		call_lock;	/* lock for calls */
140 	u32			min_sec_level;	/* minimum security level */
141 #define RXRPC_SECURITY_MAX	RXRPC_SECURITY_ENCRYPT
142 	bool			exclusive;	/* Exclusive connection for a client socket */
143 	u16			second_service;	/* Additional service bound to the endpoint */
144 	struct {
145 		/* Service upgrade information */
146 		u16		from;		/* Service ID to upgrade (if not 0) */
147 		u16		to;		/* service ID to upgrade to */
148 	} service_upgrade;
149 	sa_family_t		family;		/* Protocol family created with */
150 	struct sockaddr_rxrpc	srx;		/* Primary Service/local addresses */
151 	struct sockaddr_rxrpc	connect_srx;	/* Default client address from connect() */
152 };
153 
154 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
155 
156 /*
157  * CPU-byteorder normalised Rx packet header.
158  */
159 struct rxrpc_host_header {
160 	u32		epoch;		/* client boot timestamp */
161 	u32		cid;		/* connection and channel ID */
162 	u32		callNumber;	/* call ID (0 for connection-level packets) */
163 	u32		seq;		/* sequence number of pkt in call stream */
164 	u32		serial;		/* serial number of pkt sent to network */
165 	u8		type;		/* packet type */
166 	u8		flags;		/* packet flags */
167 	u8		userStatus;	/* app-layer defined status */
168 	u8		securityIndex;	/* security protocol ID */
169 	union {
170 		u16	_rsvd;		/* reserved */
171 		u16	cksum;		/* kerberos security checksum */
172 	};
173 	u16		serviceId;	/* service ID */
174 } __packed;
175 
176 /*
177  * RxRPC socket buffer private variables
178  * - max 48 bytes (struct sk_buff::cb)
179  */
180 struct rxrpc_skb_priv {
181 	atomic_t	nr_ring_pins;		/* Number of rxtx ring pins */
182 	u8		nr_subpackets;		/* Number of subpackets */
183 	u8		rx_flags;		/* Received packet flags */
184 #define RXRPC_SKB_INCL_LAST	0x01		/* - Includes last packet */
185 #define RXRPC_SKB_TX_BUFFER	0x02		/* - Is transmit buffer */
186 	union {
187 		int		remain;		/* amount of space remaining for next write */
188 
189 		/* List of requested ACKs on subpackets */
190 		unsigned long	rx_req_ack[(RXRPC_MAX_NR_JUMBO + BITS_PER_LONG - 1) /
191 					   BITS_PER_LONG];
192 	};
193 
194 	struct rxrpc_host_header hdr;		/* RxRPC packet header from this packet */
195 };
196 
197 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
198 
199 /*
200  * RxRPC security module interface
201  */
202 struct rxrpc_security {
203 	const char		*name;		/* name of this service */
204 	u8			security_index;	/* security type provided */
205 	u32			no_key_abort;	/* Abort code indicating no key */
206 
207 	/* Initialise a security service */
208 	int (*init)(void);
209 
210 	/* Clean up a security service */
211 	void (*exit)(void);
212 
213 	/* Parse the information from a server key */
214 	int (*preparse_server_key)(struct key_preparsed_payload *);
215 
216 	/* Clean up the preparse buffer after parsing a server key */
217 	void (*free_preparse_server_key)(struct key_preparsed_payload *);
218 
219 	/* Destroy the payload of a server key */
220 	void (*destroy_server_key)(struct key *);
221 
222 	/* Describe a server key */
223 	void (*describe_server_key)(const struct key *, struct seq_file *);
224 
225 	/* initialise a connection's security */
226 	int (*init_connection_security)(struct rxrpc_connection *,
227 					struct rxrpc_key_token *);
228 
229 	/* Work out how much data we can store in a packet, given an estimate
230 	 * of the amount of data remaining.
231 	 */
232 	int (*how_much_data)(struct rxrpc_call *, size_t,
233 			     size_t *, size_t *, size_t *);
234 
235 	/* impose security on a packet */
236 	int (*secure_packet)(struct rxrpc_call *, struct sk_buff *, size_t);
237 
238 	/* verify the security on a received packet */
239 	int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
240 			     unsigned int, unsigned int, rxrpc_seq_t, u16);
241 
242 	/* Free crypto request on a call */
243 	void (*free_call_crypto)(struct rxrpc_call *);
244 
245 	/* Locate the data in a received packet that has been verified. */
246 	void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
247 			    unsigned int *, unsigned int *);
248 
249 	/* issue a challenge */
250 	int (*issue_challenge)(struct rxrpc_connection *);
251 
252 	/* respond to a challenge */
253 	int (*respond_to_challenge)(struct rxrpc_connection *,
254 				    struct sk_buff *,
255 				    u32 *);
256 
257 	/* verify a response */
258 	int (*verify_response)(struct rxrpc_connection *,
259 			       struct sk_buff *,
260 			       u32 *);
261 
262 	/* clear connection security */
263 	void (*clear)(struct rxrpc_connection *);
264 };
265 
266 /*
267  * RxRPC local transport endpoint description
268  * - owned by a single AF_RXRPC socket
269  * - pointed to by transport socket struct sk_user_data
270  */
271 struct rxrpc_local {
272 	struct rcu_head		rcu;
273 	atomic_t		active_users;	/* Number of users of the local endpoint */
274 	refcount_t		ref;		/* Number of references to the structure */
275 	struct rxrpc_net	*rxnet;		/* The network ns in which this resides */
276 	struct hlist_node	link;
277 	struct socket		*socket;	/* my UDP socket */
278 	struct work_struct	processor;
279 	struct rxrpc_sock __rcu	*service;	/* Service(s) listening on this endpoint */
280 	struct rw_semaphore	defrag_sem;	/* control re-enablement of IP DF bit */
281 	struct sk_buff_head	reject_queue;	/* packets awaiting rejection */
282 	struct sk_buff_head	event_queue;	/* endpoint event packets awaiting processing */
283 	struct rb_root		client_bundles;	/* Client connection bundles by socket params */
284 	spinlock_t		client_bundles_lock; /* Lock for client_bundles */
285 	spinlock_t		lock;		/* access lock */
286 	rwlock_t		services_lock;	/* lock for services list */
287 	int			debug_id;	/* debug ID for printks */
288 	bool			dead;
289 	bool			service_closed;	/* Service socket closed */
290 	struct sockaddr_rxrpc	srx;		/* local address */
291 };
292 
293 /*
294  * RxRPC remote transport endpoint definition
295  * - matched by local endpoint, remote port, address and protocol type
296  */
297 struct rxrpc_peer {
298 	struct rcu_head		rcu;		/* This must be first */
299 	refcount_t		ref;
300 	unsigned long		hash_key;
301 	struct hlist_node	hash_link;
302 	struct rxrpc_local	*local;
303 	struct hlist_head	error_targets;	/* targets for net error distribution */
304 	struct rb_root		service_conns;	/* Service connections */
305 	struct list_head	keepalive_link;	/* Link in net->peer_keepalive[] */
306 	time64_t		last_tx_at;	/* Last time packet sent here */
307 	seqlock_t		service_conn_lock;
308 	spinlock_t		lock;		/* access lock */
309 	unsigned int		if_mtu;		/* interface MTU for this peer */
310 	unsigned int		mtu;		/* network MTU for this peer */
311 	unsigned int		maxdata;	/* data size (MTU - hdrsize) */
312 	unsigned short		hdrsize;	/* header size (IP + UDP + RxRPC) */
313 	int			debug_id;	/* debug ID for printks */
314 	struct sockaddr_rxrpc	srx;		/* remote address */
315 
316 	/* calculated RTT cache */
317 #define RXRPC_RTT_CACHE_SIZE 32
318 	spinlock_t		rtt_input_lock;	/* RTT lock for input routine */
319 	ktime_t			rtt_last_req;	/* Time of last RTT request */
320 	unsigned int		rtt_count;	/* Number of samples we've got */
321 
322 	u32			srtt_us;	/* smoothed round trip time << 3 in usecs */
323 	u32			mdev_us;	/* medium deviation			*/
324 	u32			mdev_max_us;	/* maximal mdev for the last rtt period	*/
325 	u32			rttvar_us;	/* smoothed mdev_max			*/
326 	u32			rto_j;		/* Retransmission timeout in jiffies */
327 	u8			backoff;	/* Backoff timeout */
328 
329 	u8			cong_cwnd;	/* Congestion window size */
330 };
331 
332 /*
333  * Keys for matching a connection.
334  */
335 struct rxrpc_conn_proto {
336 	union {
337 		struct {
338 			u32	epoch;		/* epoch of this connection */
339 			u32	cid;		/* connection ID */
340 		};
341 		u64		index_key;
342 	};
343 };
344 
345 struct rxrpc_conn_parameters {
346 	struct rxrpc_local	*local;		/* Representation of local endpoint */
347 	struct rxrpc_peer	*peer;		/* Remote endpoint */
348 	struct key		*key;		/* Security details */
349 	bool			exclusive;	/* T if conn is exclusive */
350 	bool			upgrade;	/* T if service ID can be upgraded */
351 	u16			service_id;	/* Service ID for this connection */
352 	u32			security_level;	/* Security level selected */
353 };
354 
355 /*
356  * Bits in the connection flags.
357  */
358 enum rxrpc_conn_flag {
359 	RXRPC_CONN_HAS_IDR,		/* Has a client conn ID assigned */
360 	RXRPC_CONN_IN_SERVICE_CONNS,	/* Conn is in peer->service_conns */
361 	RXRPC_CONN_DONT_REUSE,		/* Don't reuse this connection */
362 	RXRPC_CONN_PROBING_FOR_UPGRADE,	/* Probing for service upgrade */
363 	RXRPC_CONN_FINAL_ACK_0,		/* Need final ACK for channel 0 */
364 	RXRPC_CONN_FINAL_ACK_1,		/* Need final ACK for channel 1 */
365 	RXRPC_CONN_FINAL_ACK_2,		/* Need final ACK for channel 2 */
366 	RXRPC_CONN_FINAL_ACK_3,		/* Need final ACK for channel 3 */
367 };
368 
369 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) |	\
370 				   (1UL << RXRPC_CONN_FINAL_ACK_1) |	\
371 				   (1UL << RXRPC_CONN_FINAL_ACK_2) |	\
372 				   (1UL << RXRPC_CONN_FINAL_ACK_3))
373 
374 /*
375  * Events that can be raised upon a connection.
376  */
377 enum rxrpc_conn_event {
378 	RXRPC_CONN_EV_CHALLENGE,	/* Send challenge packet */
379 };
380 
381 /*
382  * The connection protocol state.
383  */
384 enum rxrpc_conn_proto_state {
385 	RXRPC_CONN_UNUSED,		/* Connection not yet attempted */
386 	RXRPC_CONN_CLIENT,		/* Client connection */
387 	RXRPC_CONN_SERVICE_PREALLOC,	/* Service connection preallocation */
388 	RXRPC_CONN_SERVICE_UNSECURED,	/* Service unsecured connection */
389 	RXRPC_CONN_SERVICE_CHALLENGING,	/* Service challenging for security */
390 	RXRPC_CONN_SERVICE,		/* Service secured connection */
391 	RXRPC_CONN_REMOTELY_ABORTED,	/* Conn aborted by peer */
392 	RXRPC_CONN_LOCALLY_ABORTED,	/* Conn aborted locally */
393 	RXRPC_CONN__NR_STATES
394 };
395 
396 /*
397  * RxRPC client connection bundle.
398  */
399 struct rxrpc_bundle {
400 	struct rxrpc_conn_parameters params;
401 	refcount_t		ref;
402 	unsigned int		debug_id;
403 	bool			try_upgrade;	/* True if the bundle is attempting upgrade */
404 	bool			alloc_conn;	/* True if someone's getting a conn */
405 	short			alloc_error;	/* Error from last conn allocation */
406 	spinlock_t		channel_lock;
407 	struct rb_node		local_node;	/* Node in local->client_conns */
408 	struct list_head	waiting_calls;	/* Calls waiting for channels */
409 	unsigned long		avail_chans;	/* Mask of available channels */
410 	struct rxrpc_connection	*conns[4];	/* The connections in the bundle (max 4) */
411 };
412 
413 /*
414  * RxRPC connection definition
415  * - matched by { local, peer, epoch, conn_id, direction }
416  * - each connection can only handle four simultaneous calls
417  */
418 struct rxrpc_connection {
419 	struct rxrpc_conn_proto	proto;
420 	struct rxrpc_conn_parameters params;
421 
422 	refcount_t		ref;
423 	struct rcu_head		rcu;
424 	struct list_head	cache_link;
425 
426 	unsigned char		act_chans;	/* Mask of active channels */
427 	struct rxrpc_channel {
428 		unsigned long		final_ack_at;	/* Time at which to issue final ACK */
429 		struct rxrpc_call __rcu	*call;		/* Active call */
430 		unsigned int		call_debug_id;	/* call->debug_id */
431 		u32			call_id;	/* ID of current call */
432 		u32			call_counter;	/* Call ID counter */
433 		u32			last_call;	/* ID of last call */
434 		u8			last_type;	/* Type of last packet */
435 		union {
436 			u32		last_seq;
437 			u32		last_abort;
438 		};
439 	} channels[RXRPC_MAXCALLS];
440 
441 	struct timer_list	timer;		/* Conn event timer */
442 	struct work_struct	processor;	/* connection event processor */
443 	struct rxrpc_bundle	*bundle;	/* Client connection bundle */
444 	struct rb_node		service_node;	/* Node in peer->service_conns */
445 	struct list_head	proc_link;	/* link in procfs list */
446 	struct list_head	link;		/* link in master connection list */
447 	struct sk_buff_head	rx_queue;	/* received conn-level packets */
448 
449 	const struct rxrpc_security *security;	/* applied security module */
450 	union {
451 		struct {
452 			struct crypto_sync_skcipher *cipher;	/* encryption handle */
453 			struct rxrpc_crypt csum_iv;	/* packet checksum base */
454 			u32	nonce;		/* response re-use preventer */
455 		} rxkad;
456 	};
457 	unsigned long		flags;
458 	unsigned long		events;
459 	unsigned long		idle_timestamp;	/* Time at which last became idle */
460 	spinlock_t		state_lock;	/* state-change lock */
461 	enum rxrpc_conn_proto_state state;	/* current state of connection */
462 	u32			abort_code;	/* Abort code of connection abort */
463 	int			debug_id;	/* debug ID for printks */
464 	atomic_t		serial;		/* packet serial number counter */
465 	unsigned int		hi_serial;	/* highest serial number received */
466 	u32			service_id;	/* Service ID, possibly upgraded */
467 	u8			security_ix;	/* security type */
468 	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
469 	u8			bundle_shift;	/* Index into bundle->avail_chans */
470 	short			error;		/* Local error code */
471 };
472 
rxrpc_to_server(const struct rxrpc_skb_priv * sp)473 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
474 {
475 	return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
476 }
477 
rxrpc_to_client(const struct rxrpc_skb_priv * sp)478 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
479 {
480 	return !rxrpc_to_server(sp);
481 }
482 
483 /*
484  * Flags in call->flags.
485  */
486 enum rxrpc_call_flag {
487 	RXRPC_CALL_RELEASED,		/* call has been released - no more message to userspace */
488 	RXRPC_CALL_HAS_USERID,		/* has a user ID attached */
489 	RXRPC_CALL_IS_SERVICE,		/* Call is service call */
490 	RXRPC_CALL_EXPOSED,		/* The call was exposed to the world */
491 	RXRPC_CALL_RX_LAST,		/* Received the last packet (at rxtx_top) */
492 	RXRPC_CALL_TX_LAST,		/* Last packet in Tx buffer (at rxtx_top) */
493 	RXRPC_CALL_SEND_PING,		/* A ping will need to be sent */
494 	RXRPC_CALL_RETRANS_TIMEOUT,	/* Retransmission due to timeout occurred */
495 	RXRPC_CALL_BEGAN_RX_TIMER,	/* We began the expect_rx_by timer */
496 	RXRPC_CALL_RX_HEARD,		/* The peer responded at least once to this call */
497 	RXRPC_CALL_RX_UNDERRUN,		/* Got data underrun */
498 	RXRPC_CALL_DISCONNECTED,	/* The call has been disconnected */
499 	RXRPC_CALL_KERNEL,		/* The call was made by the kernel */
500 	RXRPC_CALL_UPGRADE,		/* Service upgrade was requested for the call */
501 };
502 
503 /*
504  * Events that can be raised on a call.
505  */
506 enum rxrpc_call_event {
507 	RXRPC_CALL_EV_ACK,		/* need to generate ACK */
508 	RXRPC_CALL_EV_ABORT,		/* need to generate abort */
509 	RXRPC_CALL_EV_RESEND,		/* Tx resend required */
510 	RXRPC_CALL_EV_PING,		/* Ping send required */
511 	RXRPC_CALL_EV_EXPIRED,		/* Expiry occurred */
512 	RXRPC_CALL_EV_ACK_LOST,		/* ACK may be lost, send ping */
513 };
514 
515 /*
516  * The states that a call can be in.
517  */
518 enum rxrpc_call_state {
519 	RXRPC_CALL_UNINITIALISED,
520 	RXRPC_CALL_CLIENT_AWAIT_CONN,	/* - client waiting for connection to become available */
521 	RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
522 	RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
523 	RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
524 	RXRPC_CALL_SERVER_PREALLOC,	/* - service preallocation */
525 	RXRPC_CALL_SERVER_SECURING,	/* - server securing request connection */
526 	RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
527 	RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
528 	RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
529 	RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
530 	RXRPC_CALL_COMPLETE,		/* - call complete */
531 	NR__RXRPC_CALL_STATES
532 };
533 
534 /*
535  * Call completion condition (state == RXRPC_CALL_COMPLETE).
536  */
537 enum rxrpc_call_completion {
538 	RXRPC_CALL_SUCCEEDED,		/* - Normal termination */
539 	RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
540 	RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
541 	RXRPC_CALL_LOCAL_ERROR,		/* - call failed due to local error */
542 	RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
543 	NR__RXRPC_CALL_COMPLETIONS
544 };
545 
546 /*
547  * Call Tx congestion management modes.
548  */
549 enum rxrpc_congest_mode {
550 	RXRPC_CALL_SLOW_START,
551 	RXRPC_CALL_CONGEST_AVOIDANCE,
552 	RXRPC_CALL_PACKET_LOSS,
553 	RXRPC_CALL_FAST_RETRANSMIT,
554 	NR__RXRPC_CONGEST_MODES
555 };
556 
557 /*
558  * RxRPC call definition
559  * - matched by { connection, call_id }
560  */
561 struct rxrpc_call {
562 	struct rcu_head		rcu;
563 	struct rxrpc_connection	*conn;		/* connection carrying call */
564 	struct rxrpc_peer	*peer;		/* Peer record for remote address */
565 	struct rxrpc_sock __rcu	*socket;	/* socket responsible */
566 	struct rxrpc_net	*rxnet;		/* Network namespace to which call belongs */
567 	const struct rxrpc_security *security;	/* applied security module */
568 	struct mutex		user_mutex;	/* User access mutex */
569 	unsigned long		ack_at;		/* When deferred ACK needs to happen */
570 	unsigned long		ack_lost_at;	/* When ACK is figured as lost */
571 	unsigned long		resend_at;	/* When next resend needs to happen */
572 	unsigned long		ping_at;	/* When next to send a ping */
573 	unsigned long		keepalive_at;	/* When next to send a keepalive ping */
574 	unsigned long		expect_rx_by;	/* When we expect to get a packet by */
575 	unsigned long		expect_req_by;	/* When we expect to get a request DATA packet by */
576 	unsigned long		expect_term_by;	/* When we expect call termination by */
577 	u32			next_rx_timo;	/* Timeout for next Rx packet (jif) */
578 	u32			next_req_timo;	/* Timeout for next Rx request packet (jif) */
579 	struct skcipher_request	*cipher_req;	/* Packet cipher request buffer */
580 	struct timer_list	timer;		/* Combined event timer */
581 	struct work_struct	processor;	/* Event processor */
582 	rxrpc_notify_rx_t	notify_rx;	/* kernel service Rx notification function */
583 	struct list_head	link;		/* link in master call list */
584 	struct list_head	chan_wait_link;	/* Link in conn->bundle->waiting_calls */
585 	struct hlist_node	error_link;	/* link in error distribution list */
586 	struct list_head	accept_link;	/* Link in rx->acceptq */
587 	struct list_head	recvmsg_link;	/* Link in rx->recvmsg_q */
588 	struct list_head	sock_link;	/* Link in rx->sock_calls */
589 	struct rb_node		sock_node;	/* Node in rx->calls */
590 	struct sk_buff		*tx_pending;	/* Tx socket buffer being filled */
591 	wait_queue_head_t	waitq;		/* Wait queue for channel or Tx */
592 	s64			tx_total_len;	/* Total length left to be transmitted (or -1) */
593 	__be32			crypto_buf[2];	/* Temporary packet crypto buffer */
594 	unsigned long		user_call_ID;	/* user-defined call ID */
595 	unsigned long		flags;
596 	unsigned long		events;
597 	spinlock_t		lock;
598 	spinlock_t		notify_lock;	/* Kernel notification lock */
599 	rwlock_t		state_lock;	/* lock for state transition */
600 	u32			abort_code;	/* Local/remote abort code */
601 	int			error;		/* Local error incurred */
602 	enum rxrpc_call_state	state;		/* current state of call */
603 	enum rxrpc_call_completion completion;	/* Call completion condition */
604 	refcount_t		ref;
605 	u16			service_id;	/* service ID */
606 	u8			security_ix;	/* Security type */
607 	enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */
608 	u32			call_id;	/* call ID on connection  */
609 	u32			cid;		/* connection ID plus channel index */
610 	int			debug_id;	/* debug ID for printks */
611 	unsigned short		rx_pkt_offset;	/* Current recvmsg packet offset */
612 	unsigned short		rx_pkt_len;	/* Current recvmsg packet len */
613 	bool			rx_pkt_last;	/* Current recvmsg packet is last */
614 
615 	/* Rx/Tx circular buffer, depending on phase.
616 	 *
617 	 * In the Rx phase, packets are annotated with 0 or the number of the
618 	 * segment of a jumbo packet each buffer refers to.  There can be up to
619 	 * 47 segments in a maximum-size UDP packet.
620 	 *
621 	 * In the Tx phase, packets are annotated with which buffers have been
622 	 * acked.
623 	 */
624 #define RXRPC_RXTX_BUFF_SIZE	64
625 #define RXRPC_RXTX_BUFF_MASK	(RXRPC_RXTX_BUFF_SIZE - 1)
626 #define RXRPC_INIT_RX_WINDOW_SIZE 63
627 	struct sk_buff		**rxtx_buffer;
628 	u8			*rxtx_annotations;
629 #define RXRPC_TX_ANNO_ACK	0
630 #define RXRPC_TX_ANNO_UNACK	1
631 #define RXRPC_TX_ANNO_NAK	2
632 #define RXRPC_TX_ANNO_RETRANS	3
633 #define RXRPC_TX_ANNO_MASK	0x03
634 #define RXRPC_TX_ANNO_LAST	0x04
635 #define RXRPC_TX_ANNO_RESENT	0x08
636 
637 #define RXRPC_RX_ANNO_SUBPACKET	0x3f		/* Subpacket number in jumbogram */
638 #define RXRPC_RX_ANNO_VERIFIED	0x80		/* Set if verified and decrypted */
639 	rxrpc_seq_t		tx_hard_ack;	/* Dead slot in buffer; the first transmitted but
640 						 * not hard-ACK'd packet follows this.
641 						 */
642 	rxrpc_seq_t		tx_top;		/* Highest Tx slot allocated. */
643 	u16			tx_backoff;	/* Delay to insert due to Tx failure */
644 
645 	/* TCP-style slow-start congestion control [RFC5681].  Since the SMSS
646 	 * is fixed, we keep these numbers in terms of segments (ie. DATA
647 	 * packets) rather than bytes.
648 	 */
649 #define RXRPC_TX_SMSS		RXRPC_JUMBO_DATALEN
650 	u8			cong_cwnd;	/* Congestion window size */
651 	u8			cong_extra;	/* Extra to send for congestion management */
652 	u8			cong_ssthresh;	/* Slow-start threshold */
653 	enum rxrpc_congest_mode	cong_mode:8;	/* Congestion management mode */
654 	u8			cong_dup_acks;	/* Count of ACKs showing missing packets */
655 	u8			cong_cumul_acks; /* Cumulative ACK count */
656 	ktime_t			cong_tstamp;	/* Last time cwnd was changed */
657 
658 	rxrpc_seq_t		rx_hard_ack;	/* Dead slot in buffer; the first received but not
659 						 * consumed packet follows this.
660 						 */
661 	rxrpc_seq_t		rx_top;		/* Highest Rx slot allocated. */
662 	rxrpc_seq_t		rx_expect_next;	/* Expected next packet sequence number */
663 	rxrpc_serial_t		rx_serial;	/* Highest serial received for this call */
664 	u8			rx_winsize;	/* Size of Rx window */
665 	u8			tx_winsize;	/* Maximum size of Tx window */
666 	bool			tx_phase;	/* T if transmission phase, F if receive phase */
667 	u8			nr_jumbo_bad;	/* Number of jumbo dups/exceeds-windows */
668 
669 	spinlock_t		input_lock;	/* Lock for packet input to this call */
670 
671 	/* Receive-phase ACK management (ACKs we send). */
672 	u8			ackr_reason;	/* reason to ACK */
673 	rxrpc_serial_t		ackr_serial;	/* serial of packet being ACK'd */
674 	rxrpc_seq_t		ackr_highest_seq; /* Higest sequence number received */
675 	atomic_t		ackr_nr_unacked; /* Number of unacked packets */
676 	atomic_t		ackr_nr_consumed; /* Number of packets needing hard ACK */
677 
678 	/* RTT management */
679 	rxrpc_serial_t		rtt_serial[4];	/* Serial number of DATA or PING sent */
680 	ktime_t			rtt_sent_at[4];	/* Time packet sent */
681 	unsigned long		rtt_avail;	/* Mask of available slots in bits 0-3,
682 						 * Mask of pending samples in 8-11 */
683 #define RXRPC_CALL_RTT_AVAIL_MASK	0xf
684 #define RXRPC_CALL_RTT_PEND_SHIFT	8
685 
686 	/* Transmission-phase ACK management (ACKs we've received). */
687 	ktime_t			acks_latest_ts;	/* Timestamp of latest ACK received */
688 	rxrpc_seq_t		acks_first_seq;	/* first sequence number received */
689 	rxrpc_seq_t		acks_prev_seq;	/* Highest previousPacket received */
690 	rxrpc_seq_t		acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
691 	rxrpc_seq_t		acks_lost_top;	/* tx_top at the time lost-ack ping sent */
692 	rxrpc_serial_t		acks_lost_ping;	/* Serial number of probe ACK */
693 };
694 
695 /*
696  * Summary of a new ACK and the changes it made to the Tx buffer packet states.
697  */
698 struct rxrpc_ack_summary {
699 	u8			ack_reason;
700 	u8			nr_acks;		/* Number of ACKs in packet */
701 	u8			nr_nacks;		/* Number of NACKs in packet */
702 	u8			nr_new_acks;		/* Number of new ACKs in packet */
703 	u8			nr_new_nacks;		/* Number of new NACKs in packet */
704 	u8			nr_rot_new_acks;	/* Number of rotated new ACKs */
705 	bool			new_low_nack;		/* T if new low NACK found */
706 	bool			retrans_timeo;		/* T if reTx due to timeout happened */
707 	u8			flight_size;		/* Number of unreceived transmissions */
708 	/* Place to stash values for tracing */
709 	enum rxrpc_congest_mode	mode:8;
710 	u8			cwnd;
711 	u8			ssthresh;
712 	u8			dup_acks;
713 	u8			cumulative_acks;
714 };
715 
716 /*
717  * sendmsg() cmsg-specified parameters.
718  */
719 enum rxrpc_command {
720 	RXRPC_CMD_SEND_DATA,		/* send data message */
721 	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
722 	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
723 	RXRPC_CMD_CHARGE_ACCEPT,	/* [server] charge accept preallocation */
724 };
725 
726 struct rxrpc_call_params {
727 	s64			tx_total_len;	/* Total Tx data length (if send data) */
728 	unsigned long		user_call_ID;	/* User's call ID */
729 	struct {
730 		u32		hard;		/* Maximum lifetime (sec) */
731 		u32		idle;		/* Max time since last data packet (msec) */
732 		u32		normal;		/* Max time since last call packet (msec) */
733 	} timeouts;
734 	u8			nr_timeouts;	/* Number of timeouts specified */
735 	bool			kernel;		/* T if kernel is making the call */
736 	enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */
737 };
738 
739 struct rxrpc_send_params {
740 	struct rxrpc_call_params call;
741 	u32			abort_code;	/* Abort code to Tx (if abort) */
742 	enum rxrpc_command	command : 8;	/* The command to implement */
743 	bool			exclusive;	/* Shared or exclusive call */
744 	bool			upgrade;	/* If the connection is upgradeable */
745 };
746 
747 #include <trace/events/rxrpc.h>
748 
749 /*
750  * af_rxrpc.c
751  */
752 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
753 extern struct workqueue_struct *rxrpc_workqueue;
754 
755 /*
756  * call_accept.c
757  */
758 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
759 void rxrpc_discard_prealloc(struct rxrpc_sock *);
760 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
761 					   struct rxrpc_sock *,
762 					   struct sk_buff *);
763 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
764 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long);
765 
766 /*
767  * call_event.c
768  */
769 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u32, bool, bool,
770 		       enum rxrpc_propose_ack_trace);
771 void rxrpc_process_call(struct work_struct *);
772 
773 void rxrpc_reduce_call_timer(struct rxrpc_call *call,
774 			     unsigned long expire_at,
775 			     unsigned long now,
776 			     enum rxrpc_timer_trace why);
777 
778 void rxrpc_delete_call_timer(struct rxrpc_call *call);
779 
780 /*
781  * call_object.c
782  */
783 extern const char *const rxrpc_call_states[];
784 extern const char *const rxrpc_call_completions[];
785 extern unsigned int rxrpc_max_call_lifetime;
786 extern struct kmem_cache *rxrpc_call_jar;
787 
788 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
789 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
790 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
791 					 struct rxrpc_conn_parameters *,
792 					 struct sockaddr_rxrpc *,
793 					 struct rxrpc_call_params *, gfp_t,
794 					 unsigned int);
795 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
796 			 struct sk_buff *);
797 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
798 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
799 bool __rxrpc_queue_call(struct rxrpc_call *);
800 bool rxrpc_queue_call(struct rxrpc_call *);
801 void rxrpc_see_call(struct rxrpc_call *);
802 bool rxrpc_try_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op);
803 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
804 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
805 void rxrpc_cleanup_call(struct rxrpc_call *);
806 void rxrpc_destroy_all_calls(struct rxrpc_net *);
807 
rxrpc_is_service_call(const struct rxrpc_call * call)808 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
809 {
810 	return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
811 }
812 
rxrpc_is_client_call(const struct rxrpc_call * call)813 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
814 {
815 	return !rxrpc_is_service_call(call);
816 }
817 
818 /*
819  * conn_client.c
820  */
821 extern unsigned int rxrpc_reap_client_connections;
822 extern unsigned long rxrpc_conn_idle_client_expiry;
823 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
824 extern struct idr rxrpc_client_conn_ids;
825 
826 void rxrpc_destroy_client_conn_ids(void);
827 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *);
828 void rxrpc_put_bundle(struct rxrpc_bundle *);
829 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_call *,
830 		       struct rxrpc_conn_parameters *, struct sockaddr_rxrpc *,
831 		       gfp_t);
832 void rxrpc_expose_client_call(struct rxrpc_call *);
833 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *);
834 void rxrpc_put_client_conn(struct rxrpc_connection *);
835 void rxrpc_discard_expired_client_conns(struct work_struct *);
836 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
837 void rxrpc_clean_up_local_conns(struct rxrpc_local *);
838 
839 /*
840  * conn_event.c
841  */
842 void rxrpc_process_connection(struct work_struct *);
843 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
844 
845 /*
846  * conn_object.c
847  */
848 extern unsigned int rxrpc_connection_expiry;
849 extern unsigned int rxrpc_closed_conn_expiry;
850 
851 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
852 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
853 						   struct sk_buff *,
854 						   struct rxrpc_peer **);
855 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
856 void rxrpc_disconnect_call(struct rxrpc_call *);
857 void rxrpc_kill_connection(struct rxrpc_connection *);
858 bool rxrpc_queue_conn(struct rxrpc_connection *);
859 void rxrpc_see_connection(struct rxrpc_connection *);
860 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *);
861 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
862 void rxrpc_put_service_conn(struct rxrpc_connection *);
863 void rxrpc_service_connection_reaper(struct work_struct *);
864 void rxrpc_destroy_all_connections(struct rxrpc_net *);
865 
rxrpc_conn_is_client(const struct rxrpc_connection * conn)866 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
867 {
868 	return conn->out_clientflag;
869 }
870 
rxrpc_conn_is_service(const struct rxrpc_connection * conn)871 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
872 {
873 	return !rxrpc_conn_is_client(conn);
874 }
875 
rxrpc_put_connection(struct rxrpc_connection * conn)876 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
877 {
878 	if (!conn)
879 		return;
880 
881 	if (rxrpc_conn_is_client(conn))
882 		rxrpc_put_client_conn(conn);
883 	else
884 		rxrpc_put_service_conn(conn);
885 }
886 
rxrpc_reduce_conn_timer(struct rxrpc_connection * conn,unsigned long expire_at)887 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
888 					   unsigned long expire_at)
889 {
890 	timer_reduce(&conn->timer, expire_at);
891 }
892 
893 /*
894  * conn_service.c
895  */
896 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
897 						     struct sk_buff *);
898 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
899 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *,
900 				   const struct rxrpc_security *, struct sk_buff *);
901 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
902 
903 /*
904  * input.c
905  */
906 int rxrpc_input_packet(struct sock *, struct sk_buff *);
907 
908 /*
909  * insecure.c
910  */
911 extern const struct rxrpc_security rxrpc_no_security;
912 
913 /*
914  * key.c
915  */
916 extern struct key_type key_type_rxrpc;
917 
918 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int);
919 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
920 			      u32);
921 
922 /*
923  * local_event.c
924  */
925 extern void rxrpc_process_local_events(struct rxrpc_local *);
926 
927 /*
928  * local_object.c
929  */
930 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
931 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
932 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
933 void rxrpc_put_local(struct rxrpc_local *);
934 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *);
935 void rxrpc_unuse_local(struct rxrpc_local *);
936 void rxrpc_queue_local(struct rxrpc_local *);
937 void rxrpc_destroy_all_locals(struct rxrpc_net *);
938 
__rxrpc_unuse_local(struct rxrpc_local * local)939 static inline bool __rxrpc_unuse_local(struct rxrpc_local *local)
940 {
941 	return atomic_dec_return(&local->active_users) == 0;
942 }
943 
__rxrpc_use_local(struct rxrpc_local * local)944 static inline bool __rxrpc_use_local(struct rxrpc_local *local)
945 {
946 	return atomic_fetch_add_unless(&local->active_users, 1, 0) != 0;
947 }
948 
949 /*
950  * misc.c
951  */
952 extern unsigned int rxrpc_max_backlog __read_mostly;
953 extern unsigned long rxrpc_requested_ack_delay;
954 extern unsigned long rxrpc_soft_ack_delay;
955 extern unsigned long rxrpc_idle_ack_delay;
956 extern unsigned int rxrpc_rx_window_size;
957 extern unsigned int rxrpc_rx_mtu;
958 extern unsigned int rxrpc_rx_jumbo_max;
959 
960 extern const s8 rxrpc_ack_priority[];
961 
962 /*
963  * net_ns.c
964  */
965 extern unsigned int rxrpc_net_id;
966 extern struct pernet_operations rxrpc_net_ops;
967 
rxrpc_net(struct net * net)968 static inline struct rxrpc_net *rxrpc_net(struct net *net)
969 {
970 	return net_generic(net, rxrpc_net_id);
971 }
972 
973 /*
974  * output.c
975  */
976 int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
977 int rxrpc_send_abort_packet(struct rxrpc_call *);
978 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
979 void rxrpc_reject_packets(struct rxrpc_local *);
980 void rxrpc_send_keepalive(struct rxrpc_peer *);
981 
982 /*
983  * peer_event.c
984  */
985 void rxrpc_encap_err_rcv(struct sock *sk, struct sk_buff *skb, unsigned int udp_offset);
986 void rxrpc_error_report(struct sock *);
987 void rxrpc_peer_keepalive_worker(struct work_struct *);
988 
989 /*
990  * peer_object.c
991  */
992 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
993 					 const struct sockaddr_rxrpc *);
994 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *, struct rxrpc_local *,
995 				     struct sockaddr_rxrpc *, gfp_t);
996 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
997 void rxrpc_new_incoming_peer(struct rxrpc_sock *, struct rxrpc_local *,
998 			     struct rxrpc_peer *);
999 void rxrpc_destroy_all_peers(struct rxrpc_net *);
1000 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
1001 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
1002 void rxrpc_put_peer(struct rxrpc_peer *);
1003 void rxrpc_put_peer_locked(struct rxrpc_peer *);
1004 
1005 /*
1006  * proc.c
1007  */
1008 extern const struct seq_operations rxrpc_call_seq_ops;
1009 extern const struct seq_operations rxrpc_connection_seq_ops;
1010 extern const struct seq_operations rxrpc_peer_seq_ops;
1011 extern const struct seq_operations rxrpc_local_seq_ops;
1012 
1013 /*
1014  * recvmsg.c
1015  */
1016 void rxrpc_notify_socket(struct rxrpc_call *);
1017 bool __rxrpc_set_call_completion(struct rxrpc_call *, enum rxrpc_call_completion, u32, int);
1018 bool rxrpc_set_call_completion(struct rxrpc_call *, enum rxrpc_call_completion, u32, int);
1019 bool __rxrpc_call_completed(struct rxrpc_call *);
1020 bool rxrpc_call_completed(struct rxrpc_call *);
1021 bool __rxrpc_abort_call(const char *, struct rxrpc_call *, rxrpc_seq_t, u32, int);
1022 bool rxrpc_abort_call(const char *, struct rxrpc_call *, rxrpc_seq_t, u32, int);
1023 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1024 
1025 /*
1026  * Abort a call due to a protocol error.
1027  */
__rxrpc_abort_eproto(struct rxrpc_call * call,struct sk_buff * skb,const char * eproto_why,const char * why,u32 abort_code)1028 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
1029 					struct sk_buff *skb,
1030 					const char *eproto_why,
1031 					const char *why,
1032 					u32 abort_code)
1033 {
1034 	struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
1035 
1036 	trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
1037 	return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
1038 }
1039 
1040 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
1041 	__rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
1042 			     (abort_why), (abort_code))
1043 
1044 /*
1045  * rtt.c
1046  */
1047 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int,
1048 			rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1049 unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool);
1050 void rxrpc_peer_init_rtt(struct rxrpc_peer *);
1051 
1052 /*
1053  * rxkad.c
1054  */
1055 #ifdef CONFIG_RXKAD
1056 extern const struct rxrpc_security rxkad;
1057 #endif
1058 
1059 /*
1060  * security.c
1061  */
1062 int __init rxrpc_init_security(void);
1063 const struct rxrpc_security *rxrpc_security_lookup(u8);
1064 void rxrpc_exit_security(void);
1065 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1066 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *,
1067 							 struct sk_buff *);
1068 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *,
1069 					  struct sk_buff *, u32, u32);
1070 
1071 /*
1072  * sendmsg.c
1073  */
1074 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1075 
1076 /*
1077  * server_key.c
1078  */
1079 extern struct key_type key_type_rxrpc_s;
1080 
1081 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int);
1082 
1083 /*
1084  * skbuff.c
1085  */
1086 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1087 void rxrpc_packet_destructor(struct sk_buff *);
1088 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1089 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1090 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
1091 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1092 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1093 void rxrpc_purge_queue(struct sk_buff_head *);
1094 
1095 /*
1096  * sysctl.c
1097  */
1098 #ifdef CONFIG_SYSCTL
1099 extern int __init rxrpc_sysctl_init(void);
1100 extern void rxrpc_sysctl_exit(void);
1101 #else
rxrpc_sysctl_init(void)1102 static inline int __init rxrpc_sysctl_init(void) { return 0; }
rxrpc_sysctl_exit(void)1103 static inline void rxrpc_sysctl_exit(void) {}
1104 #endif
1105 
1106 /*
1107  * utils.c
1108  */
1109 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1110 
before(u32 seq1,u32 seq2)1111 static inline bool before(u32 seq1, u32 seq2)
1112 {
1113         return (s32)(seq1 - seq2) < 0;
1114 }
before_eq(u32 seq1,u32 seq2)1115 static inline bool before_eq(u32 seq1, u32 seq2)
1116 {
1117         return (s32)(seq1 - seq2) <= 0;
1118 }
after(u32 seq1,u32 seq2)1119 static inline bool after(u32 seq1, u32 seq2)
1120 {
1121         return (s32)(seq1 - seq2) > 0;
1122 }
after_eq(u32 seq1,u32 seq2)1123 static inline bool after_eq(u32 seq1, u32 seq2)
1124 {
1125         return (s32)(seq1 - seq2) >= 0;
1126 }
1127 
1128 /*
1129  * debug tracing
1130  */
1131 extern unsigned int rxrpc_debug;
1132 
1133 #define dbgprintk(FMT,...) \
1134 	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1135 
1136 #define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1137 #define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1138 #define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
1139 #define kproto(FMT,...)	dbgprintk("### "FMT ,##__VA_ARGS__)
1140 #define knet(FMT,...)	dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1141 
1142 
1143 #if defined(__KDEBUG)
1144 #define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
1145 #define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
1146 #define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
1147 #define _proto(FMT,...)	kproto(FMT,##__VA_ARGS__)
1148 #define _net(FMT,...)	knet(FMT,##__VA_ARGS__)
1149 
1150 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1151 #define RXRPC_DEBUG_KENTER	0x01
1152 #define RXRPC_DEBUG_KLEAVE	0x02
1153 #define RXRPC_DEBUG_KDEBUG	0x04
1154 #define RXRPC_DEBUG_KPROTO	0x08
1155 #define RXRPC_DEBUG_KNET	0x10
1156 
1157 #define _enter(FMT,...)					\
1158 do {							\
1159 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER))	\
1160 		kenter(FMT,##__VA_ARGS__);		\
1161 } while (0)
1162 
1163 #define _leave(FMT,...)					\
1164 do {							\
1165 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE))	\
1166 		kleave(FMT,##__VA_ARGS__);		\
1167 } while (0)
1168 
1169 #define _debug(FMT,...)					\
1170 do {							\
1171 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG))	\
1172 		kdebug(FMT,##__VA_ARGS__);		\
1173 } while (0)
1174 
1175 #define _proto(FMT,...)					\
1176 do {							\
1177 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO))	\
1178 		kproto(FMT,##__VA_ARGS__);		\
1179 } while (0)
1180 
1181 #define _net(FMT,...)					\
1182 do {							\
1183 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))	\
1184 		knet(FMT,##__VA_ARGS__);		\
1185 } while (0)
1186 
1187 #else
1188 #define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1189 #define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1190 #define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
1191 #define _proto(FMT,...)	no_printk("### "FMT ,##__VA_ARGS__)
1192 #define _net(FMT,...)	no_printk("@@@ "FMT ,##__VA_ARGS__)
1193 #endif
1194 
1195 /*
1196  * debug assertion checking
1197  */
1198 #if 1 // defined(__KDEBUGALL)
1199 
1200 #define ASSERT(X)						\
1201 do {								\
1202 	if (unlikely(!(X))) {					\
1203 		pr_err("Assertion failed\n");			\
1204 		BUG();						\
1205 	}							\
1206 } while (0)
1207 
1208 #define ASSERTCMP(X, OP, Y)						\
1209 do {									\
1210 	__typeof__(X) _x = (X);						\
1211 	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1212 	if (unlikely(!(_x OP _y))) {					\
1213 		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1214 		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1215 		       (unsigned long)_y, (unsigned long)_y);		\
1216 		BUG();							\
1217 	}								\
1218 } while (0)
1219 
1220 #define ASSERTIF(C, X)						\
1221 do {								\
1222 	if (unlikely((C) && !(X))) {				\
1223 		pr_err("Assertion failed\n");			\
1224 		BUG();						\
1225 	}							\
1226 } while (0)
1227 
1228 #define ASSERTIFCMP(C, X, OP, Y)					\
1229 do {									\
1230 	__typeof__(X) _x = (X);						\
1231 	__typeof__(Y) _y = (__typeof__(X))(Y);				\
1232 	if (unlikely((C) && !(_x OP _y))) {				\
1233 		pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1234 		       (unsigned long)_x, (unsigned long)_x, #OP,	\
1235 		       (unsigned long)_y, (unsigned long)_y);		\
1236 		BUG();							\
1237 	}								\
1238 } while (0)
1239 
1240 #else
1241 
1242 #define ASSERT(X)				\
1243 do {						\
1244 } while (0)
1245 
1246 #define ASSERTCMP(X, OP, Y)			\
1247 do {						\
1248 } while (0)
1249 
1250 #define ASSERTIF(C, X)				\
1251 do {						\
1252 } while (0)
1253 
1254 #define ASSERTIFCMP(C, X, OP, Y)		\
1255 do {						\
1256 } while (0)
1257 
1258 #endif /* __KDEBUGALL */
1259