1 /* AF_RXRPC internal definitions
2  *
3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11 
12 #include <rxrpc/packet.h>
13 
14 #if 0
15 #define CHECK_SLAB_OKAY(X)				     \
16 	BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
17 	       (POISON_FREE << 8 | POISON_FREE))
18 #else
19 #define CHECK_SLAB_OKAY(X) do {} while(0)
20 #endif
21 
22 #define FCRYPT_BSIZE 8
23 struct rxrpc_crypt {
24 	union {
25 		u8	x[FCRYPT_BSIZE];
26 		__be32	n[2];
27 	};
28 } __attribute__((aligned(8)));
29 
30 #define rxrpc_queue_work(WS)	queue_work(rxrpc_workqueue, (WS))
31 #define rxrpc_queue_delayed_work(WS,D)	\
32 	queue_delayed_work(rxrpc_workqueue, (WS), (D))
33 
34 #define rxrpc_queue_call(CALL)	rxrpc_queue_work(&(CALL)->processor)
35 #define rxrpc_queue_conn(CONN)	rxrpc_queue_work(&(CONN)->processor)
36 
37 /*
38  * sk_state for RxRPC sockets
39  */
40 enum {
41 	RXRPC_UNCONNECTED = 0,
42 	RXRPC_CLIENT_BOUND,		/* client local address bound */
43 	RXRPC_CLIENT_CONNECTED,		/* client is connected */
44 	RXRPC_SERVER_BOUND,		/* server local address bound */
45 	RXRPC_SERVER_LISTENING,		/* server listening for connections */
46 	RXRPC_CLOSE,			/* socket is being closed */
47 };
48 
49 /*
50  * RxRPC socket definition
51  */
52 struct rxrpc_sock {
53 	/* WARNING: sk has to be the first member */
54 	struct sock		sk;
55 	rxrpc_interceptor_t	interceptor;	/* kernel service Rx interceptor function */
56 	struct rxrpc_local	*local;		/* local endpoint */
57 	struct rxrpc_transport	*trans;		/* transport handler */
58 	struct rxrpc_conn_bundle *bundle;	/* virtual connection bundle */
59 	struct rxrpc_connection	*conn;		/* exclusive virtual connection */
60 	struct list_head	listen_link;	/* link in the local endpoint's listen list */
61 	struct list_head	secureq;	/* calls awaiting connection security clearance */
62 	struct list_head	acceptq;	/* calls awaiting acceptance */
63 	struct key		*key;		/* security for this socket */
64 	struct key		*securities;	/* list of server security descriptors */
65 	struct rb_root		calls;		/* outstanding calls on this socket */
66 	unsigned long		flags;
67 #define RXRPC_SOCK_EXCLUSIVE_CONN	1	/* exclusive connection for a client socket */
68 	rwlock_t		call_lock;	/* lock for calls */
69 	u32			min_sec_level;	/* minimum security level */
70 #define RXRPC_SECURITY_MAX	RXRPC_SECURITY_ENCRYPT
71 	struct sockaddr_rxrpc	srx;		/* local address */
72 	sa_family_t		proto;		/* protocol created with */
73 	__be16			service_id;	/* service ID of local/remote service */
74 };
75 
76 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
77 
78 /*
79  * RxRPC socket buffer private variables
80  * - max 48 bytes (struct sk_buff::cb)
81  */
82 struct rxrpc_skb_priv {
83 	struct rxrpc_call	*call;		/* call with which associated */
84 	unsigned long		resend_at;	/* time in jiffies at which to resend */
85 	union {
86 		unsigned	offset;		/* offset into buffer of next read */
87 		int		remain;		/* amount of space remaining for next write */
88 		u32		error;		/* network error code */
89 		bool		need_resend;	/* T if needs resending */
90 	};
91 
92 	struct rxrpc_header	hdr;		/* RxRPC packet header from this packet */
93 };
94 
95 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
96 
97 enum rxrpc_command {
98 	RXRPC_CMD_SEND_DATA,		/* send data message */
99 	RXRPC_CMD_SEND_ABORT,		/* request abort generation */
100 	RXRPC_CMD_ACCEPT,		/* [server] accept incoming call */
101 	RXRPC_CMD_REJECT_BUSY,		/* [server] reject a call as busy */
102 };
103 
104 /*
105  * RxRPC security module interface
106  */
107 struct rxrpc_security {
108 	struct module		*owner;		/* providing module */
109 	struct list_head	link;		/* link in master list */
110 	const char		*name;		/* name of this service */
111 	u8			security_index;	/* security type provided */
112 
113 	/* initialise a connection's security */
114 	int (*init_connection_security)(struct rxrpc_connection *);
115 
116 	/* prime a connection's packet security */
117 	void (*prime_packet_security)(struct rxrpc_connection *);
118 
119 	/* impose security on a packet */
120 	int (*secure_packet)(const struct rxrpc_call *,
121 			     struct sk_buff *,
122 			     size_t,
123 			     void *);
124 
125 	/* verify the security on a received packet */
126 	int (*verify_packet)(const struct rxrpc_call *, struct sk_buff *,
127 			     u32 *);
128 
129 	/* issue a challenge */
130 	int (*issue_challenge)(struct rxrpc_connection *);
131 
132 	/* respond to a challenge */
133 	int (*respond_to_challenge)(struct rxrpc_connection *,
134 				    struct sk_buff *,
135 				    u32 *);
136 
137 	/* verify a response */
138 	int (*verify_response)(struct rxrpc_connection *,
139 			       struct sk_buff *,
140 			       u32 *);
141 
142 	/* clear connection security */
143 	void (*clear)(struct rxrpc_connection *);
144 };
145 
146 /*
147  * RxRPC local transport endpoint definition
148  * - matched by local port, address and protocol type
149  */
150 struct rxrpc_local {
151 	struct socket		*socket;	/* my UDP socket */
152 	struct work_struct	destroyer;	/* endpoint destroyer */
153 	struct work_struct	acceptor;	/* incoming call processor */
154 	struct work_struct	rejecter;	/* packet reject writer */
155 	struct list_head	services;	/* services listening on this endpoint */
156 	struct list_head	link;		/* link in endpoint list */
157 	struct rw_semaphore	defrag_sem;	/* control re-enablement of IP DF bit */
158 	struct sk_buff_head	accept_queue;	/* incoming calls awaiting acceptance */
159 	struct sk_buff_head	reject_queue;	/* packets awaiting rejection */
160 	spinlock_t		lock;		/* access lock */
161 	rwlock_t		services_lock;	/* lock for services list */
162 	atomic_t		usage;
163 	int			debug_id;	/* debug ID for printks */
164 	volatile char		error_rcvd;	/* T if received ICMP error outstanding */
165 	struct sockaddr_rxrpc	srx;		/* local address */
166 };
167 
168 /*
169  * RxRPC remote transport endpoint definition
170  * - matched by remote port, address and protocol type
171  * - holds the connection ID counter for connections between the two endpoints
172  */
173 struct rxrpc_peer {
174 	struct work_struct	destroyer;	/* peer destroyer */
175 	struct list_head	link;		/* link in master peer list */
176 	struct list_head	error_targets;	/* targets for net error distribution */
177 	spinlock_t		lock;		/* access lock */
178 	atomic_t		usage;
179 	unsigned		if_mtu;		/* interface MTU for this peer */
180 	unsigned		mtu;		/* network MTU for this peer */
181 	unsigned		maxdata;	/* data size (MTU - hdrsize) */
182 	unsigned short		hdrsize;	/* header size (IP + UDP + RxRPC) */
183 	int			debug_id;	/* debug ID for printks */
184 	int			net_error;	/* network error distributed */
185 	struct sockaddr_rxrpc	srx;		/* remote address */
186 
187 	/* calculated RTT cache */
188 #define RXRPC_RTT_CACHE_SIZE 32
189 	suseconds_t		rtt;		/* current RTT estimate (in uS) */
190 	unsigned		rtt_point;	/* next entry at which to insert */
191 	unsigned		rtt_usage;	/* amount of cache actually used */
192 	suseconds_t		rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
193 };
194 
195 /*
196  * RxRPC point-to-point transport / connection manager definition
197  * - handles a bundle of connections between two endpoints
198  * - matched by { local, peer }
199  */
200 struct rxrpc_transport {
201 	struct rxrpc_local	*local;		/* local transport endpoint */
202 	struct rxrpc_peer	*peer;		/* remote transport endpoint */
203 	struct work_struct	error_handler;	/* network error distributor */
204 	struct rb_root		bundles;	/* client connection bundles on this transport */
205 	struct rb_root		client_conns;	/* client connections on this transport */
206 	struct rb_root		server_conns;	/* server connections on this transport */
207 	struct list_head	link;		/* link in master session list */
208 	struct sk_buff_head	error_queue;	/* error packets awaiting processing */
209 	time_t			put_time;	/* time at which to reap */
210 	spinlock_t		client_lock;	/* client connection allocation lock */
211 	rwlock_t		conn_lock;	/* lock for active/dead connections */
212 	atomic_t		usage;
213 	int			debug_id;	/* debug ID for printks */
214 	unsigned int		conn_idcounter;	/* connection ID counter (client) */
215 };
216 
217 /*
218  * RxRPC client connection bundle
219  * - matched by { transport, service_id, key }
220  */
221 struct rxrpc_conn_bundle {
222 	struct rb_node		node;		/* node in transport's lookup tree */
223 	struct list_head	unused_conns;	/* unused connections in this bundle */
224 	struct list_head	avail_conns;	/* available connections in this bundle */
225 	struct list_head	busy_conns;	/* busy connections in this bundle */
226 	struct key		*key;		/* security for this bundle */
227 	wait_queue_head_t	chanwait;	/* wait for channel to become available */
228 	atomic_t		usage;
229 	int			debug_id;	/* debug ID for printks */
230 	unsigned short		num_conns;	/* number of connections in this bundle */
231 	__be16			service_id;	/* service ID */
232 	u8			security_ix;	/* security type */
233 };
234 
235 /*
236  * RxRPC connection definition
237  * - matched by { transport, service_id, conn_id, direction, key }
238  * - each connection can only handle four simultaneous calls
239  */
240 struct rxrpc_connection {
241 	struct rxrpc_transport	*trans;		/* transport session */
242 	struct rxrpc_conn_bundle *bundle;	/* connection bundle (client) */
243 	struct work_struct	processor;	/* connection event processor */
244 	struct rb_node		node;		/* node in transport's lookup tree */
245 	struct list_head	link;		/* link in master connection list */
246 	struct list_head	bundle_link;	/* link in bundle */
247 	struct rb_root		calls;		/* calls on this connection */
248 	struct sk_buff_head	rx_queue;	/* received conn-level packets */
249 	struct rxrpc_call	*channels[RXRPC_MAXCALLS]; /* channels (active calls) */
250 	struct rxrpc_security	*security;	/* applied security module */
251 	struct key		*key;		/* security for this connection (client) */
252 	struct key		*server_key;	/* security for this service */
253 	struct crypto_blkcipher	*cipher;	/* encryption handle */
254 	struct rxrpc_crypt	csum_iv;	/* packet checksum base */
255 	unsigned long		events;
256 #define RXRPC_CONN_CHALLENGE	0		/* send challenge packet */
257 	time_t			put_time;	/* time at which to reap */
258 	rwlock_t		lock;		/* access lock */
259 	spinlock_t		state_lock;	/* state-change lock */
260 	atomic_t		usage;
261 	u32			real_conn_id;	/* connection ID (host-endian) */
262 	enum {					/* current state of connection */
263 		RXRPC_CONN_UNUSED,		/* - connection not yet attempted */
264 		RXRPC_CONN_CLIENT,		/* - client connection */
265 		RXRPC_CONN_SERVER_UNSECURED,	/* - server unsecured connection */
266 		RXRPC_CONN_SERVER_CHALLENGING,	/* - server challenging for security */
267 		RXRPC_CONN_SERVER,		/* - server secured connection */
268 		RXRPC_CONN_REMOTELY_ABORTED,	/* - conn aborted by peer */
269 		RXRPC_CONN_LOCALLY_ABORTED,	/* - conn aborted locally */
270 		RXRPC_CONN_NETWORK_ERROR,	/* - conn terminated by network error */
271 	} state;
272 	int			error;		/* error code for local abort */
273 	int			debug_id;	/* debug ID for printks */
274 	unsigned		call_counter;	/* call ID counter */
275 	atomic_t		serial;		/* packet serial number counter */
276 	atomic_t		hi_serial;	/* highest serial number received */
277 	u8			avail_calls;	/* number of calls available */
278 	u8			size_align;	/* data size alignment (for security) */
279 	u8			header_size;	/* rxrpc + security header size */
280 	u8			security_size;	/* security header size */
281 	u32			security_level;	/* security level negotiated */
282 	u32			security_nonce;	/* response re-use preventer */
283 
284 	/* the following are all in net order */
285 	__be32			epoch;		/* epoch of this connection */
286 	__be32			cid;		/* connection ID */
287 	__be16			service_id;	/* service ID */
288 	u8			security_ix;	/* security type */
289 	u8			in_clientflag;	/* RXRPC_CLIENT_INITIATED if we are server */
290 	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
291 };
292 
293 /*
294  * RxRPC call definition
295  * - matched by { connection, call_id }
296  */
297 struct rxrpc_call {
298 	struct rxrpc_connection	*conn;		/* connection carrying call */
299 	struct rxrpc_sock	*socket;	/* socket responsible */
300 	struct timer_list	lifetimer;	/* lifetime remaining on call */
301 	struct timer_list	deadspan;	/* reap timer for re-ACK'ing, etc  */
302 	struct timer_list	ack_timer;	/* ACK generation timer */
303 	struct timer_list	resend_timer;	/* Tx resend timer */
304 	struct work_struct	destroyer;	/* call destroyer */
305 	struct work_struct	processor;	/* packet processor and ACK generator */
306 	struct list_head	link;		/* link in master call list */
307 	struct list_head	error_link;	/* link in error distribution list */
308 	struct list_head	accept_link;	/* calls awaiting acceptance */
309 	struct rb_node		sock_node;	/* node in socket call tree */
310 	struct rb_node		conn_node;	/* node in connection call tree */
311 	struct sk_buff_head	rx_queue;	/* received packets */
312 	struct sk_buff_head	rx_oos_queue;	/* packets received out of sequence */
313 	struct sk_buff		*tx_pending;	/* Tx socket buffer being filled */
314 	wait_queue_head_t	tx_waitq;	/* wait for Tx window space to become available */
315 	unsigned long		user_call_ID;	/* user-defined call ID */
316 	unsigned long		creation_jif;	/* time of call creation */
317 	unsigned long		flags;
318 #define RXRPC_CALL_RELEASED	0	/* call has been released - no more message to userspace */
319 #define RXRPC_CALL_TERMINAL_MSG	1	/* call has given the socket its final message */
320 #define RXRPC_CALL_RCVD_LAST	2	/* all packets received */
321 #define RXRPC_CALL_RUN_RTIMER	3	/* Tx resend timer started */
322 #define RXRPC_CALL_TX_SOFT_ACK	4	/* sent some soft ACKs */
323 #define RXRPC_CALL_PROC_BUSY	5	/* the processor is busy */
324 #define RXRPC_CALL_INIT_ACCEPT	6	/* acceptance was initiated */
325 #define RXRPC_CALL_HAS_USERID	7	/* has a user ID attached */
326 #define RXRPC_CALL_EXPECT_OOS	8	/* expect out of sequence packets */
327 	unsigned long		events;
328 #define RXRPC_CALL_RCVD_ACKALL	0	/* ACKALL or reply received */
329 #define RXRPC_CALL_RCVD_BUSY	1	/* busy packet received */
330 #define RXRPC_CALL_RCVD_ABORT	2	/* abort packet received */
331 #define RXRPC_CALL_RCVD_ERROR	3	/* network error received */
332 #define RXRPC_CALL_ACK_FINAL	4	/* need to generate final ACK (and release call) */
333 #define RXRPC_CALL_ACK		5	/* need to generate ACK */
334 #define RXRPC_CALL_REJECT_BUSY	6	/* need to generate busy message */
335 #define RXRPC_CALL_ABORT	7	/* need to generate abort */
336 #define RXRPC_CALL_CONN_ABORT	8	/* local connection abort generated */
337 #define RXRPC_CALL_RESEND_TIMER	9	/* Tx resend timer expired */
338 #define RXRPC_CALL_RESEND	10	/* Tx resend required */
339 #define RXRPC_CALL_DRAIN_RX_OOS	11	/* drain the Rx out of sequence queue */
340 #define RXRPC_CALL_LIFE_TIMER	12	/* call's lifetimer ran out */
341 #define RXRPC_CALL_ACCEPTED	13	/* incoming call accepted by userspace app */
342 #define RXRPC_CALL_SECURED	14	/* incoming call's connection is now secure */
343 #define RXRPC_CALL_POST_ACCEPT	15	/* need to post an "accept?" message to the app */
344 #define RXRPC_CALL_RELEASE	16	/* need to release the call's resources */
345 
346 	spinlock_t		lock;
347 	rwlock_t		state_lock;	/* lock for state transition */
348 	atomic_t		usage;
349 	atomic_t		sequence;	/* Tx data packet sequence counter */
350 	u32			abort_code;	/* local/remote abort code */
351 	enum {					/* current state of call */
352 		RXRPC_CALL_CLIENT_SEND_REQUEST,	/* - client sending request phase */
353 		RXRPC_CALL_CLIENT_AWAIT_REPLY,	/* - client awaiting reply */
354 		RXRPC_CALL_CLIENT_RECV_REPLY,	/* - client receiving reply phase */
355 		RXRPC_CALL_CLIENT_FINAL_ACK,	/* - client sending final ACK phase */
356 		RXRPC_CALL_SERVER_SECURING,	/* - server securing request connection */
357 		RXRPC_CALL_SERVER_ACCEPTING,	/* - server accepting request */
358 		RXRPC_CALL_SERVER_RECV_REQUEST,	/* - server receiving request */
359 		RXRPC_CALL_SERVER_ACK_REQUEST,	/* - server pending ACK of request */
360 		RXRPC_CALL_SERVER_SEND_REPLY,	/* - server sending reply */
361 		RXRPC_CALL_SERVER_AWAIT_ACK,	/* - server awaiting final ACK */
362 		RXRPC_CALL_COMPLETE,		/* - call completed */
363 		RXRPC_CALL_SERVER_BUSY,		/* - call rejected by busy server */
364 		RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
365 		RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
366 		RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
367 		RXRPC_CALL_DEAD,		/* - call is dead */
368 	} state;
369 	int			debug_id;	/* debug ID for printks */
370 	u8			channel;	/* connection channel occupied by this call */
371 
372 	/* transmission-phase ACK management */
373 	u8			acks_head;	/* offset into window of first entry */
374 	u8			acks_tail;	/* offset into window of last entry */
375 	u8			acks_winsz;	/* size of un-ACK'd window */
376 	u8			acks_unacked;	/* lowest unacked packet in last ACK received */
377 	int			acks_latest;	/* serial number of latest ACK received */
378 	rxrpc_seq_t		acks_hard;	/* highest definitively ACK'd msg seq */
379 	unsigned long		*acks_window;	/* sent packet window
380 						 * - elements are pointers with LSB set if ACK'd
381 						 */
382 
383 	/* receive-phase ACK management */
384 	rxrpc_seq_t		rx_data_expect;	/* next data seq ID expected to be received */
385 	rxrpc_seq_t		rx_data_post;	/* next data seq ID expected to be posted */
386 	rxrpc_seq_t		rx_data_recv;	/* last data seq ID encountered by recvmsg */
387 	rxrpc_seq_t		rx_data_eaten;	/* last data seq ID consumed by recvmsg */
388 	rxrpc_seq_t		rx_first_oos;	/* first packet in rx_oos_queue (or 0) */
389 	rxrpc_seq_t		ackr_win_top;	/* top of ACK window (rx_data_eaten is bottom) */
390 	rxrpc_seq_net_t		ackr_prev_seq;	/* previous sequence number received */
391 	u8			ackr_reason;	/* reason to ACK */
392 	__be32			ackr_serial;	/* serial of packet being ACK'd */
393 	atomic_t		ackr_not_idle;	/* number of packets in Rx queue */
394 
395 	/* received packet records, 1 bit per record */
396 #define RXRPC_ACKR_WINDOW_ASZ DIV_ROUND_UP(RXRPC_MAXACKS, BITS_PER_LONG)
397 	unsigned long		ackr_window[RXRPC_ACKR_WINDOW_ASZ + 1];
398 
399 	/* the following should all be in net order */
400 	__be32			cid;		/* connection ID + channel index  */
401 	__be32			call_id;	/* call ID on connection  */
402 };
403 
404 /*
405  * locally abort an RxRPC call
406  */
rxrpc_abort_call(struct rxrpc_call * call,u32 abort_code)407 static inline void rxrpc_abort_call(struct rxrpc_call *call, u32 abort_code)
408 {
409 	write_lock_bh(&call->state_lock);
410 	if (call->state < RXRPC_CALL_COMPLETE) {
411 		call->abort_code = abort_code;
412 		call->state = RXRPC_CALL_LOCALLY_ABORTED;
413 		set_bit(RXRPC_CALL_ABORT, &call->events);
414 	}
415 	write_unlock_bh(&call->state_lock);
416 }
417 
418 /*
419  * af_rxrpc.c
420  */
421 extern atomic_t rxrpc_n_skbs;
422 extern __be32 rxrpc_epoch;
423 extern atomic_t rxrpc_debug_id;
424 extern struct workqueue_struct *rxrpc_workqueue;
425 
426 /*
427  * ar-accept.c
428  */
429 extern void rxrpc_accept_incoming_calls(struct work_struct *);
430 extern struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *,
431 					    unsigned long);
432 extern int rxrpc_reject_call(struct rxrpc_sock *);
433 
434 /*
435  * ar-ack.c
436  */
437 extern void __rxrpc_propose_ACK(struct rxrpc_call *, u8, __be32, bool);
438 extern void rxrpc_propose_ACK(struct rxrpc_call *, u8, __be32, bool);
439 extern void rxrpc_process_call(struct work_struct *);
440 
441 /*
442  * ar-call.c
443  */
444 extern struct kmem_cache *rxrpc_call_jar;
445 extern struct list_head rxrpc_calls;
446 extern rwlock_t rxrpc_call_lock;
447 
448 extern struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *,
449 						struct rxrpc_transport *,
450 						struct rxrpc_conn_bundle *,
451 						unsigned long, int, gfp_t);
452 extern struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
453 					      struct rxrpc_connection *,
454 					      struct rxrpc_header *, gfp_t);
455 extern struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *,
456 						 unsigned long);
457 extern void rxrpc_release_call(struct rxrpc_call *);
458 extern void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
459 extern void __rxrpc_put_call(struct rxrpc_call *);
460 extern void __exit rxrpc_destroy_all_calls(void);
461 
462 /*
463  * ar-connection.c
464  */
465 extern struct list_head rxrpc_connections;
466 extern rwlock_t rxrpc_connection_lock;
467 
468 extern struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *,
469 						  struct rxrpc_transport *,
470 						  struct key *,
471 						  __be16, gfp_t);
472 extern void rxrpc_put_bundle(struct rxrpc_transport *,
473 			     struct rxrpc_conn_bundle *);
474 extern int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_transport *,
475 			      struct rxrpc_conn_bundle *, struct rxrpc_call *,
476 			      gfp_t);
477 extern void rxrpc_put_connection(struct rxrpc_connection *);
478 extern void __exit rxrpc_destroy_all_connections(void);
479 extern struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
480 						      struct rxrpc_header *);
481 extern struct rxrpc_connection *
482 rxrpc_incoming_connection(struct rxrpc_transport *, struct rxrpc_header *,
483 			  gfp_t);
484 
485 /*
486  * ar-connevent.c
487  */
488 extern void rxrpc_process_connection(struct work_struct *);
489 extern void rxrpc_reject_packet(struct rxrpc_local *, struct sk_buff *);
490 extern void rxrpc_reject_packets(struct work_struct *);
491 
492 /*
493  * ar-error.c
494  */
495 extern void rxrpc_UDP_error_report(struct sock *);
496 extern void rxrpc_UDP_error_handler(struct work_struct *);
497 
498 /*
499  * ar-input.c
500  */
501 extern unsigned long rxrpc_ack_timeout;
502 extern const char *rxrpc_pkts[];
503 
504 extern void rxrpc_data_ready(struct sock *, int);
505 extern int rxrpc_queue_rcv_skb(struct rxrpc_call *, struct sk_buff *, bool,
506 			       bool);
507 extern void rxrpc_fast_process_packet(struct rxrpc_call *, struct sk_buff *);
508 
509 /*
510  * ar-local.c
511  */
512 extern rwlock_t rxrpc_local_lock;
513 extern struct rxrpc_local *rxrpc_lookup_local(struct sockaddr_rxrpc *);
514 extern void rxrpc_put_local(struct rxrpc_local *);
515 extern void __exit rxrpc_destroy_all_locals(void);
516 
517 /*
518  * ar-key.c
519  */
520 extern struct key_type key_type_rxrpc;
521 extern struct key_type key_type_rxrpc_s;
522 
523 extern int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
524 extern int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
525 extern int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *,
526 				     time_t, u32);
527 
528 /*
529  * ar-output.c
530  */
531 extern int rxrpc_resend_timeout;
532 
533 extern int rxrpc_send_packet(struct rxrpc_transport *, struct sk_buff *);
534 extern int rxrpc_client_sendmsg(struct kiocb *, struct rxrpc_sock *,
535 				struct rxrpc_transport *, struct msghdr *,
536 				size_t);
537 extern int rxrpc_server_sendmsg(struct kiocb *, struct rxrpc_sock *,
538 				struct msghdr *, size_t);
539 
540 /*
541  * ar-peer.c
542  */
543 extern struct rxrpc_peer *rxrpc_get_peer(struct sockaddr_rxrpc *, gfp_t);
544 extern void rxrpc_put_peer(struct rxrpc_peer *);
545 extern struct rxrpc_peer *rxrpc_find_peer(struct rxrpc_local *,
546 					  __be32, __be16);
547 extern void __exit rxrpc_destroy_all_peers(void);
548 
549 /*
550  * ar-proc.c
551  */
552 extern const char *const rxrpc_call_states[];
553 extern const struct file_operations rxrpc_call_seq_fops;
554 extern const struct file_operations rxrpc_connection_seq_fops;
555 
556 /*
557  * ar-recvmsg.c
558  */
559 extern void rxrpc_remove_user_ID(struct rxrpc_sock *, struct rxrpc_call *);
560 extern int rxrpc_recvmsg(struct kiocb *, struct socket *, struct msghdr *,
561 			 size_t, int);
562 
563 /*
564  * ar-security.c
565  */
566 extern int rxrpc_register_security(struct rxrpc_security *);
567 extern void rxrpc_unregister_security(struct rxrpc_security *);
568 extern int rxrpc_init_client_conn_security(struct rxrpc_connection *);
569 extern int rxrpc_init_server_conn_security(struct rxrpc_connection *);
570 extern int rxrpc_secure_packet(const struct rxrpc_call *, struct sk_buff *,
571 			       size_t, void *);
572 extern int rxrpc_verify_packet(const struct rxrpc_call *, struct sk_buff *,
573 			       u32 *);
574 extern void rxrpc_clear_conn_security(struct rxrpc_connection *);
575 
576 /*
577  * ar-skbuff.c
578  */
579 extern void rxrpc_packet_destructor(struct sk_buff *);
580 
581 /*
582  * ar-transport.c
583  */
584 extern struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *,
585 						   struct rxrpc_peer *,
586 						   gfp_t);
587 extern void rxrpc_put_transport(struct rxrpc_transport *);
588 extern void __exit rxrpc_destroy_all_transports(void);
589 extern struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *,
590 						    struct rxrpc_peer *);
591 
592 /*
593  * debug tracing
594  */
595 extern unsigned rxrpc_debug;
596 
597 #define dbgprintk(FMT,...) \
598 	printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
599 
600 #define kenter(FMT,...)	dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
601 #define kleave(FMT,...)	dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
602 #define kdebug(FMT,...)	dbgprintk("    "FMT ,##__VA_ARGS__)
603 #define kproto(FMT,...)	dbgprintk("### "FMT ,##__VA_ARGS__)
604 #define knet(FMT,...)	dbgprintk("@@@ "FMT ,##__VA_ARGS__)
605 
606 
607 #if defined(__KDEBUG)
608 #define _enter(FMT,...)	kenter(FMT,##__VA_ARGS__)
609 #define _leave(FMT,...)	kleave(FMT,##__VA_ARGS__)
610 #define _debug(FMT,...)	kdebug(FMT,##__VA_ARGS__)
611 #define _proto(FMT,...)	kproto(FMT,##__VA_ARGS__)
612 #define _net(FMT,...)	knet(FMT,##__VA_ARGS__)
613 
614 #elif defined(CONFIG_AF_RXRPC_DEBUG)
615 #define RXRPC_DEBUG_KENTER	0x01
616 #define RXRPC_DEBUG_KLEAVE	0x02
617 #define RXRPC_DEBUG_KDEBUG	0x04
618 #define RXRPC_DEBUG_KPROTO	0x08
619 #define RXRPC_DEBUG_KNET	0x10
620 
621 #define _enter(FMT,...)					\
622 do {							\
623 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER))	\
624 		kenter(FMT,##__VA_ARGS__);		\
625 } while (0)
626 
627 #define _leave(FMT,...)					\
628 do {							\
629 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE))	\
630 		kleave(FMT,##__VA_ARGS__);		\
631 } while (0)
632 
633 #define _debug(FMT,...)					\
634 do {							\
635 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG))	\
636 		kdebug(FMT,##__VA_ARGS__);		\
637 } while (0)
638 
639 #define _proto(FMT,...)					\
640 do {							\
641 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO))	\
642 		kproto(FMT,##__VA_ARGS__);		\
643 } while (0)
644 
645 #define _net(FMT,...)					\
646 do {							\
647 	if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET))	\
648 		knet(FMT,##__VA_ARGS__);		\
649 } while (0)
650 
651 #else
652 #define _enter(FMT,...)	no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
653 #define _leave(FMT,...)	no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
654 #define _debug(FMT,...)	no_printk("    "FMT ,##__VA_ARGS__)
655 #define _proto(FMT,...)	no_printk("### "FMT ,##__VA_ARGS__)
656 #define _net(FMT,...)	no_printk("@@@ "FMT ,##__VA_ARGS__)
657 #endif
658 
659 /*
660  * debug assertion checking
661  */
662 #if 1 // defined(__KDEBUGALL)
663 
664 #define ASSERT(X)						\
665 do {								\
666 	if (unlikely(!(X))) {					\
667 		printk(KERN_ERR "\n");				\
668 		printk(KERN_ERR "RxRPC: Assertion failed\n");	\
669 		BUG();						\
670 	}							\
671 } while(0)
672 
673 #define ASSERTCMP(X, OP, Y)						\
674 do {									\
675 	if (unlikely(!((X) OP (Y)))) {					\
676 		printk(KERN_ERR "\n");					\
677 		printk(KERN_ERR "RxRPC: Assertion failed\n");		\
678 		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
679 		       (unsigned long)(X), (unsigned long)(Y));		\
680 		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
681 		       (unsigned long)(X), (unsigned long)(Y));		\
682 		BUG();							\
683 	}								\
684 } while(0)
685 
686 #define ASSERTIF(C, X)						\
687 do {								\
688 	if (unlikely((C) && !(X))) {				\
689 		printk(KERN_ERR "\n");				\
690 		printk(KERN_ERR "RxRPC: Assertion failed\n");	\
691 		BUG();						\
692 	}							\
693 } while(0)
694 
695 #define ASSERTIFCMP(C, X, OP, Y)					\
696 do {									\
697 	if (unlikely((C) && !((X) OP (Y)))) {				\
698 		printk(KERN_ERR "\n");					\
699 		printk(KERN_ERR "RxRPC: Assertion failed\n");		\
700 		printk(KERN_ERR "%lu " #OP " %lu is false\n",		\
701 		       (unsigned long)(X), (unsigned long)(Y));		\
702 		printk(KERN_ERR "0x%lx " #OP " 0x%lx is false\n",	\
703 		       (unsigned long)(X), (unsigned long)(Y));		\
704 		BUG();							\
705 	}								\
706 } while(0)
707 
708 #else
709 
710 #define ASSERT(X)				\
711 do {						\
712 } while(0)
713 
714 #define ASSERTCMP(X, OP, Y)			\
715 do {						\
716 } while(0)
717 
718 #define ASSERTIF(C, X)				\
719 do {						\
720 } while(0)
721 
722 #define ASSERTIFCMP(C, X, OP, Y)		\
723 do {						\
724 } while(0)
725 
726 #endif /* __KDEBUGALL */
727 
728 /*
729  * socket buffer accounting / leak finding
730  */
__rxrpc_new_skb(struct sk_buff * skb,const char * fn)731 static inline void __rxrpc_new_skb(struct sk_buff *skb, const char *fn)
732 {
733 	//_net("new skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
734 	//atomic_inc(&rxrpc_n_skbs);
735 }
736 
737 #define rxrpc_new_skb(skb) __rxrpc_new_skb((skb), __func__)
738 
__rxrpc_kill_skb(struct sk_buff * skb,const char * fn)739 static inline void __rxrpc_kill_skb(struct sk_buff *skb, const char *fn)
740 {
741 	//_net("kill skb %p %s [%d]", skb, fn, atomic_read(&rxrpc_n_skbs));
742 	//atomic_dec(&rxrpc_n_skbs);
743 }
744 
745 #define rxrpc_kill_skb(skb) __rxrpc_kill_skb((skb), __func__)
746 
__rxrpc_free_skb(struct sk_buff * skb,const char * fn)747 static inline void __rxrpc_free_skb(struct sk_buff *skb, const char *fn)
748 {
749 	if (skb) {
750 		CHECK_SLAB_OKAY(&skb->users);
751 		//_net("free skb %p %s [%d]",
752 		//     skb, fn, atomic_read(&rxrpc_n_skbs));
753 		//atomic_dec(&rxrpc_n_skbs);
754 		kfree_skb(skb);
755 	}
756 }
757 
758 #define rxrpc_free_skb(skb) __rxrpc_free_skb((skb), __func__)
759 
rxrpc_purge_queue(struct sk_buff_head * list)760 static inline void rxrpc_purge_queue(struct sk_buff_head *list)
761 {
762 	struct sk_buff *skb;
763 	while ((skb = skb_dequeue((list))) != NULL)
764 		rxrpc_free_skb(skb);
765 }
766 
__rxrpc_get_local(struct rxrpc_local * local,const char * f)767 static inline void __rxrpc_get_local(struct rxrpc_local *local, const char *f)
768 {
769 	CHECK_SLAB_OKAY(&local->usage);
770 	if (atomic_inc_return(&local->usage) == 1)
771 		printk("resurrected (%s)\n", f);
772 }
773 
774 #define rxrpc_get_local(LOCAL) __rxrpc_get_local((LOCAL), __func__)
775 
776 #define rxrpc_get_call(CALL)				\
777 do {							\
778 	CHECK_SLAB_OKAY(&(CALL)->usage);		\
779 	if (atomic_inc_return(&(CALL)->usage) == 1)	\
780 		BUG();					\
781 } while(0)
782 
783 #define rxrpc_put_call(CALL)				\
784 do {							\
785 	__rxrpc_put_call(CALL);				\
786 } while(0)
787