1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __FS_CEPH_MESSENGER_H
3 #define __FS_CEPH_MESSENGER_H
4 
5 #include <linux/bvec.h>
6 #include <linux/crypto.h>
7 #include <linux/kref.h>
8 #include <linux/mutex.h>
9 #include <linux/net.h>
10 #include <linux/radix-tree.h>
11 #include <linux/uio.h>
12 #include <linux/workqueue.h>
13 #include <net/net_namespace.h>
14 
15 #include <linux/ceph/types.h>
16 #include <linux/ceph/buffer.h>
17 
18 struct ceph_msg;
19 struct ceph_connection;
20 struct ceph_msg_data_cursor;
21 
22 /*
23  * Ceph defines these callbacks for handling connection events.
24  */
25 struct ceph_connection_operations {
26 	struct ceph_connection *(*get)(struct ceph_connection *);
27 	void (*put)(struct ceph_connection *);
28 
29 	/* handle an incoming message. */
30 	void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m);
31 
32 	/* authorize an outgoing connection */
33 	struct ceph_auth_handshake *(*get_authorizer) (
34 				struct ceph_connection *con,
35 			       int *proto, int force_new);
36 	int (*add_authorizer_challenge)(struct ceph_connection *con,
37 					void *challenge_buf,
38 					int challenge_buf_len);
39 	int (*verify_authorizer_reply) (struct ceph_connection *con);
40 	int (*invalidate_authorizer)(struct ceph_connection *con);
41 
42 	/* there was some error on the socket (disconnect, whatever) */
43 	void (*fault) (struct ceph_connection *con);
44 
45 	/* a remote host as terminated a message exchange session, and messages
46 	 * we sent (or they tried to send us) may be lost. */
47 	void (*peer_reset) (struct ceph_connection *con);
48 
49 	struct ceph_msg * (*alloc_msg) (struct ceph_connection *con,
50 					struct ceph_msg_header *hdr,
51 					int *skip);
52 
53 	void (*reencode_message) (struct ceph_msg *msg);
54 
55 	int (*sign_message) (struct ceph_msg *msg);
56 	int (*check_message_signature) (struct ceph_msg *msg);
57 
58 	/* msgr2 authentication exchange */
59 	int (*get_auth_request)(struct ceph_connection *con,
60 				void *buf, int *buf_len,
61 				void **authorizer, int *authorizer_len);
62 	int (*handle_auth_reply_more)(struct ceph_connection *con,
63 				      void *reply, int reply_len,
64 				      void *buf, int *buf_len,
65 				      void **authorizer, int *authorizer_len);
66 	int (*handle_auth_done)(struct ceph_connection *con,
67 				u64 global_id, void *reply, int reply_len,
68 				u8 *session_key, int *session_key_len,
69 				u8 *con_secret, int *con_secret_len);
70 	int (*handle_auth_bad_method)(struct ceph_connection *con,
71 				      int used_proto, int result,
72 				      const int *allowed_protos, int proto_cnt,
73 				      const int *allowed_modes, int mode_cnt);
74 
75 	/**
76 	 * sparse_read: read sparse data
77 	 * @con: connection we're reading from
78 	 * @cursor: data cursor for reading extents
79 	 * @buf: optional buffer to read into
80 	 *
81 	 * This should be called more than once, each time setting up to
82 	 * receive an extent into the current cursor position, and zeroing
83 	 * the holes between them.
84 	 *
85 	 * Returns amount of data to be read (in bytes), 0 if reading is
86 	 * complete, or -errno if there was an error.
87 	 *
88 	 * If @buf is set on a >0 return, then the data should be read into
89 	 * the provided buffer. Otherwise, it should be read into the cursor.
90 	 *
91 	 * The sparse read operation is expected to initialize the cursor
92 	 * with a length covering up to the end of the last extent.
93 	 */
94 	int (*sparse_read)(struct ceph_connection *con,
95 			   struct ceph_msg_data_cursor *cursor,
96 			   char **buf);
97 
98 };
99 
100 /* use format string %s%lld */
101 #define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num)
102 
103 struct ceph_messenger {
104 	struct ceph_entity_inst inst;    /* my name+address */
105 	struct ceph_entity_addr my_enc_addr;
106 
107 	atomic_t stopping;
108 	possible_net_t net;
109 
110 	/*
111 	 * the global_seq counts connections i (attempt to) initiate
112 	 * in order to disambiguate certain connect race conditions.
113 	 */
114 	u32 global_seq;
115 	spinlock_t global_seq_lock;
116 };
117 
118 enum ceph_msg_data_type {
119 	CEPH_MSG_DATA_NONE,	/* message contains no data payload */
120 	CEPH_MSG_DATA_PAGES,	/* data source/destination is a page array */
121 	CEPH_MSG_DATA_PAGELIST,	/* data source/destination is a pagelist */
122 #ifdef CONFIG_BLOCK
123 	CEPH_MSG_DATA_BIO,	/* data source/destination is a bio list */
124 #endif /* CONFIG_BLOCK */
125 	CEPH_MSG_DATA_BVECS,	/* data source/destination is a bio_vec array */
126 	CEPH_MSG_DATA_ITER,	/* data source/destination is an iov_iter */
127 };
128 
129 #ifdef CONFIG_BLOCK
130 
131 struct ceph_bio_iter {
132 	struct bio *bio;
133 	struct bvec_iter iter;
134 };
135 
136 #define __ceph_bio_iter_advance_step(it, n, STEP) do {			      \
137 	unsigned int __n = (n), __cur_n;				      \
138 									      \
139 	while (__n) {							      \
140 		BUG_ON(!(it)->iter.bi_size);				      \
141 		__cur_n = min((it)->iter.bi_size, __n);			      \
142 		(void)(STEP);						      \
143 		bio_advance_iter((it)->bio, &(it)->iter, __cur_n);	      \
144 		if (!(it)->iter.bi_size && (it)->bio->bi_next) {	      \
145 			dout("__ceph_bio_iter_advance_step next bio\n");      \
146 			(it)->bio = (it)->bio->bi_next;			      \
147 			(it)->iter = (it)->bio->bi_iter;		      \
148 		}							      \
149 		__n -= __cur_n;						      \
150 	}								      \
151 } while (0)
152 
153 /*
154  * Advance @it by @n bytes.
155  */
156 #define ceph_bio_iter_advance(it, n)					      \
157 	__ceph_bio_iter_advance_step(it, n, 0)
158 
159 /*
160  * Advance @it by @n bytes, executing BVEC_STEP for each bio_vec.
161  */
162 #define ceph_bio_iter_advance_step(it, n, BVEC_STEP)			      \
163 	__ceph_bio_iter_advance_step(it, n, ({				      \
164 		struct bio_vec bv;					      \
165 		struct bvec_iter __cur_iter;				      \
166 									      \
167 		__cur_iter = (it)->iter;				      \
168 		__cur_iter.bi_size = __cur_n;				      \
169 		__bio_for_each_segment(bv, (it)->bio, __cur_iter, __cur_iter) \
170 			(void)(BVEC_STEP);				      \
171 	}))
172 
173 #endif /* CONFIG_BLOCK */
174 
175 struct ceph_bvec_iter {
176 	struct bio_vec *bvecs;
177 	struct bvec_iter iter;
178 };
179 
180 #define __ceph_bvec_iter_advance_step(it, n, STEP) do {			      \
181 	BUG_ON((n) > (it)->iter.bi_size);				      \
182 	(void)(STEP);							      \
183 	bvec_iter_advance((it)->bvecs, &(it)->iter, (n));		      \
184 } while (0)
185 
186 /*
187  * Advance @it by @n bytes.
188  */
189 #define ceph_bvec_iter_advance(it, n)					      \
190 	__ceph_bvec_iter_advance_step(it, n, 0)
191 
192 /*
193  * Advance @it by @n bytes, executing BVEC_STEP for each bio_vec.
194  */
195 #define ceph_bvec_iter_advance_step(it, n, BVEC_STEP)			      \
196 	__ceph_bvec_iter_advance_step(it, n, ({				      \
197 		struct bio_vec bv;					      \
198 		struct bvec_iter __cur_iter;				      \
199 									      \
200 		__cur_iter = (it)->iter;				      \
201 		__cur_iter.bi_size = (n);				      \
202 		for_each_bvec(bv, (it)->bvecs, __cur_iter, __cur_iter)	      \
203 			(void)(BVEC_STEP);				      \
204 	}))
205 
206 #define ceph_bvec_iter_shorten(it, n) do {				      \
207 	BUG_ON((n) > (it)->iter.bi_size);				      \
208 	(it)->iter.bi_size = (n);					      \
209 } while (0)
210 
211 struct ceph_msg_data {
212 	enum ceph_msg_data_type		type;
213 	union {
214 #ifdef CONFIG_BLOCK
215 		struct {
216 			struct ceph_bio_iter	bio_pos;
217 			u32			bio_length;
218 		};
219 #endif /* CONFIG_BLOCK */
220 		struct ceph_bvec_iter	bvec_pos;
221 		struct {
222 			struct page	**pages;
223 			size_t		length;		/* total # bytes */
224 			unsigned int	alignment;	/* first page */
225 			bool		own_pages;
226 		};
227 		struct ceph_pagelist	*pagelist;
228 		struct iov_iter		iter;
229 	};
230 };
231 
232 struct ceph_msg_data_cursor {
233 	size_t			total_resid;	/* across all data items */
234 
235 	struct ceph_msg_data	*data;		/* current data item */
236 	size_t			resid;		/* bytes not yet consumed */
237 	int			sr_resid;	/* residual sparse_read len */
238 	bool			need_crc;	/* crc update needed */
239 	union {
240 #ifdef CONFIG_BLOCK
241 		struct ceph_bio_iter	bio_iter;
242 #endif /* CONFIG_BLOCK */
243 		struct bvec_iter	bvec_iter;
244 		struct {				/* pages */
245 			unsigned int	page_offset;	/* offset in page */
246 			unsigned short	page_index;	/* index in array */
247 			unsigned short	page_count;	/* pages in array */
248 		};
249 		struct {				/* pagelist */
250 			struct page	*page;		/* page from list */
251 			size_t		offset;		/* bytes from list */
252 		};
253 		struct {
254 			struct iov_iter		iov_iter;
255 			unsigned int		lastlen;
256 		};
257 	};
258 };
259 
260 /*
261  * a single message.  it contains a header (src, dest, message type, etc.),
262  * footer (crc values, mainly), a "front" message body, and possibly a
263  * data payload (stored in some number of pages).
264  */
265 struct ceph_msg {
266 	struct ceph_msg_header hdr;	/* header */
267 	union {
268 		struct ceph_msg_footer footer;		/* footer */
269 		struct ceph_msg_footer_old old_footer;	/* old format footer */
270 	};
271 	struct kvec front;              /* unaligned blobs of message */
272 	struct ceph_buffer *middle;
273 
274 	size_t				data_length;
275 	struct ceph_msg_data		*data;
276 	int				num_data_items;
277 	int				max_data_items;
278 	struct ceph_msg_data_cursor	cursor;
279 
280 	struct ceph_connection *con;
281 	struct list_head list_head;	/* links for connection lists */
282 
283 	struct kref kref;
284 	bool more_to_follow;
285 	bool needs_out_seq;
286 	u64 sparse_read_total;
287 	int front_alloc_len;
288 
289 	struct ceph_msgpool *pool;
290 };
291 
292 /*
293  * connection states
294  */
295 #define CEPH_CON_S_CLOSED		1
296 #define CEPH_CON_S_PREOPEN		2
297 #define CEPH_CON_S_V1_BANNER		3
298 #define CEPH_CON_S_V1_CONNECT_MSG	4
299 #define CEPH_CON_S_V2_BANNER_PREFIX	5
300 #define CEPH_CON_S_V2_BANNER_PAYLOAD	6
301 #define CEPH_CON_S_V2_HELLO		7
302 #define CEPH_CON_S_V2_AUTH		8
303 #define CEPH_CON_S_V2_AUTH_SIGNATURE	9
304 #define CEPH_CON_S_V2_SESSION_CONNECT	10
305 #define CEPH_CON_S_V2_SESSION_RECONNECT	11
306 #define CEPH_CON_S_OPEN			12
307 #define CEPH_CON_S_STANDBY		13
308 
309 /*
310  * ceph_connection flag bits
311  */
312 #define CEPH_CON_F_LOSSYTX		0  /* we can close channel or drop
313 					      messages on errors */
314 #define CEPH_CON_F_KEEPALIVE_PENDING	1  /* we need to send a keepalive */
315 #define CEPH_CON_F_WRITE_PENDING	2  /* we have data ready to send */
316 #define CEPH_CON_F_SOCK_CLOSED		3  /* socket state changed to closed */
317 #define CEPH_CON_F_BACKOFF		4  /* need to retry queuing delayed
318 					      work */
319 
320 /* ceph connection fault delay defaults, for exponential backoff */
321 #define BASE_DELAY_INTERVAL	(HZ / 4)
322 #define MAX_DELAY_INTERVAL	(15 * HZ)
323 
324 struct ceph_connection_v1_info {
325 	struct kvec out_kvec[8],         /* sending header/footer data */
326 		*out_kvec_cur;
327 	int out_kvec_left;   /* kvec's left in out_kvec */
328 	int out_skip;        /* skip this many bytes */
329 	int out_kvec_bytes;  /* total bytes left */
330 	bool out_more;       /* there is more data after the kvecs */
331 	bool out_msg_done;
332 
333 	struct ceph_auth_handshake *auth;
334 	int auth_retry;       /* true if we need a newer authorizer */
335 
336 	/* connection negotiation temps */
337 	u8 in_banner[CEPH_BANNER_MAX_LEN];
338 	struct ceph_entity_addr actual_peer_addr;
339 	struct ceph_entity_addr peer_addr_for_me;
340 	struct ceph_msg_connect out_connect;
341 	struct ceph_msg_connect_reply in_reply;
342 
343 	int in_base_pos;     /* bytes read */
344 
345 	/* sparse reads */
346 	struct kvec in_sr_kvec; /* current location to receive into */
347 	u64 in_sr_len;		/* amount of data in this extent */
348 
349 	/* message in temps */
350 	u8 in_tag;           /* protocol control byte */
351 	struct ceph_msg_header in_hdr;
352 	__le64 in_temp_ack;  /* for reading an ack */
353 
354 	/* message out temps */
355 	struct ceph_msg_header out_hdr;
356 	__le64 out_temp_ack;  /* for writing an ack */
357 	struct ceph_timespec out_temp_keepalive2;  /* for writing keepalive2
358 						      stamp */
359 
360 	u32 connect_seq;      /* identify the most recent connection
361 				 attempt for this session */
362 	u32 peer_global_seq;  /* peer's global seq for this connection */
363 };
364 
365 #define CEPH_CRC_LEN			4
366 #define CEPH_GCM_KEY_LEN		16
367 #define CEPH_GCM_IV_LEN			sizeof(struct ceph_gcm_nonce)
368 #define CEPH_GCM_BLOCK_LEN		16
369 #define CEPH_GCM_TAG_LEN		16
370 
371 #define CEPH_PREAMBLE_LEN		32
372 #define CEPH_PREAMBLE_INLINE_LEN	48
373 #define CEPH_PREAMBLE_PLAIN_LEN		CEPH_PREAMBLE_LEN
374 #define CEPH_PREAMBLE_SECURE_LEN	(CEPH_PREAMBLE_LEN +		\
375 					 CEPH_PREAMBLE_INLINE_LEN +	\
376 					 CEPH_GCM_TAG_LEN)
377 #define CEPH_EPILOGUE_PLAIN_LEN		(1 + 3 * CEPH_CRC_LEN)
378 #define CEPH_EPILOGUE_SECURE_LEN	(CEPH_GCM_BLOCK_LEN + CEPH_GCM_TAG_LEN)
379 
380 #define CEPH_FRAME_MAX_SEGMENT_COUNT	4
381 
382 struct ceph_frame_desc {
383 	int fd_tag;  /* FRAME_TAG_* */
384 	int fd_seg_cnt;
385 	int fd_lens[CEPH_FRAME_MAX_SEGMENT_COUNT];  /* logical */
386 	int fd_aligns[CEPH_FRAME_MAX_SEGMENT_COUNT];
387 };
388 
389 struct ceph_gcm_nonce {
390 	__le32 fixed;
391 	__le64 counter __packed;
392 };
393 
394 struct ceph_connection_v2_info {
395 	struct iov_iter in_iter;
396 	struct kvec in_kvecs[5];  /* recvmsg */
397 	struct bio_vec in_bvec;  /* recvmsg (in_cursor) */
398 	int in_kvec_cnt;
399 	int in_state;  /* IN_S_* */
400 
401 	struct iov_iter out_iter;
402 	struct kvec out_kvecs[8];  /* sendmsg */
403 	struct bio_vec out_bvec;  /* sendpage (out_cursor, out_zero),
404 				     sendmsg (out_enc_pages) */
405 	int out_kvec_cnt;
406 	int out_state;  /* OUT_S_* */
407 
408 	int out_zero;  /* # of zero bytes to send */
409 	bool out_iter_sendpage;  /* use sendpage if possible */
410 
411 	struct ceph_frame_desc in_desc;
412 	struct ceph_msg_data_cursor in_cursor;
413 	struct ceph_msg_data_cursor out_cursor;
414 
415 	struct crypto_shash *hmac_tfm;  /* post-auth signature */
416 	struct crypto_aead *gcm_tfm;  /* on-wire encryption */
417 	struct aead_request *gcm_req;
418 	struct crypto_wait gcm_wait;
419 	struct ceph_gcm_nonce in_gcm_nonce;
420 	struct ceph_gcm_nonce out_gcm_nonce;
421 
422 	struct page **in_enc_pages;
423 	int in_enc_page_cnt;
424 	int in_enc_resid;
425 	int in_enc_i;
426 	struct page **out_enc_pages;
427 	int out_enc_page_cnt;
428 	int out_enc_resid;
429 	int out_enc_i;
430 
431 	int con_mode;  /* CEPH_CON_MODE_* */
432 
433 	void *conn_bufs[16];
434 	int conn_buf_cnt;
435 	int data_len_remain;
436 
437 	struct kvec in_sign_kvecs[8];
438 	struct kvec out_sign_kvecs[8];
439 	int in_sign_kvec_cnt;
440 	int out_sign_kvec_cnt;
441 
442 	u64 client_cookie;
443 	u64 server_cookie;
444 	u64 global_seq;
445 	u64 connect_seq;
446 	u64 peer_global_seq;
447 
448 	u8 in_buf[CEPH_PREAMBLE_SECURE_LEN];
449 	u8 out_buf[CEPH_PREAMBLE_SECURE_LEN];
450 	struct {
451 		u8 late_status;  /* FRAME_LATE_STATUS_* */
452 		union {
453 			struct {
454 				u32 front_crc;
455 				u32 middle_crc;
456 				u32 data_crc;
457 			} __packed;
458 			u8 pad[CEPH_GCM_BLOCK_LEN - 1];
459 		};
460 	} out_epil;
461 };
462 
463 /*
464  * A single connection with another host.
465  *
466  * We maintain a queue of outgoing messages, and some session state to
467  * ensure that we can preserve the lossless, ordered delivery of
468  * messages in the case of a TCP disconnect.
469  */
470 struct ceph_connection {
471 	void *private;
472 
473 	const struct ceph_connection_operations *ops;
474 
475 	struct ceph_messenger *msgr;
476 
477 	int state;  /* CEPH_CON_S_* */
478 	atomic_t sock_state;
479 	struct socket *sock;
480 
481 	unsigned long flags;  /* CEPH_CON_F_* */
482 	const char *error_msg;  /* error message, if any */
483 
484 	struct ceph_entity_name peer_name; /* peer name */
485 	struct ceph_entity_addr peer_addr; /* peer address */
486 	u64 peer_features;
487 
488 	struct mutex mutex;
489 
490 	/* out queue */
491 	struct list_head out_queue;
492 	struct list_head out_sent;   /* sending or sent but unacked */
493 	u64 out_seq;		     /* last message queued for send */
494 
495 	u64 in_seq, in_seq_acked;  /* last message received, acked */
496 
497 	struct ceph_msg *in_msg;
498 	struct ceph_msg *out_msg;        /* sending message (== tail of
499 					    out_sent) */
500 
501 	struct page *bounce_page;
502 	u32 in_front_crc, in_middle_crc, in_data_crc;  /* calculated crc */
503 
504 	struct timespec64 last_keepalive_ack; /* keepalive2 ack stamp */
505 
506 	struct delayed_work work;	    /* send|recv work */
507 	unsigned long       delay;          /* current delay interval */
508 
509 	union {
510 		struct ceph_connection_v1_info v1;
511 		struct ceph_connection_v2_info v2;
512 	};
513 };
514 
515 extern struct page *ceph_zero_page;
516 
517 void ceph_con_flag_clear(struct ceph_connection *con, unsigned long con_flag);
518 void ceph_con_flag_set(struct ceph_connection *con, unsigned long con_flag);
519 bool ceph_con_flag_test(struct ceph_connection *con, unsigned long con_flag);
520 bool ceph_con_flag_test_and_clear(struct ceph_connection *con,
521 				  unsigned long con_flag);
522 bool ceph_con_flag_test_and_set(struct ceph_connection *con,
523 				unsigned long con_flag);
524 
525 void ceph_encode_my_addr(struct ceph_messenger *msgr);
526 
527 int ceph_tcp_connect(struct ceph_connection *con);
528 int ceph_con_close_socket(struct ceph_connection *con);
529 void ceph_con_reset_session(struct ceph_connection *con);
530 
531 u32 ceph_get_global_seq(struct ceph_messenger *msgr, u32 gt);
532 void ceph_con_discard_sent(struct ceph_connection *con, u64 ack_seq);
533 void ceph_con_discard_requeued(struct ceph_connection *con, u64 reconnect_seq);
534 
535 void ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor,
536 			       struct ceph_msg *msg, size_t length);
537 struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor,
538 				size_t *page_offset, size_t *length);
539 void ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor, size_t bytes);
540 
541 u32 ceph_crc32c_page(u32 crc, struct page *page, unsigned int page_offset,
542 		     unsigned int length);
543 
544 bool ceph_addr_is_blank(const struct ceph_entity_addr *addr);
545 int ceph_addr_port(const struct ceph_entity_addr *addr);
546 void ceph_addr_set_port(struct ceph_entity_addr *addr, int p);
547 
548 void ceph_con_process_message(struct ceph_connection *con);
549 int ceph_con_in_msg_alloc(struct ceph_connection *con,
550 			  struct ceph_msg_header *hdr, int *skip);
551 void ceph_con_get_out_msg(struct ceph_connection *con);
552 
553 /* messenger_v1.c */
554 int ceph_con_v1_try_read(struct ceph_connection *con);
555 int ceph_con_v1_try_write(struct ceph_connection *con);
556 void ceph_con_v1_revoke(struct ceph_connection *con);
557 void ceph_con_v1_revoke_incoming(struct ceph_connection *con);
558 bool ceph_con_v1_opened(struct ceph_connection *con);
559 void ceph_con_v1_reset_session(struct ceph_connection *con);
560 void ceph_con_v1_reset_protocol(struct ceph_connection *con);
561 
562 /* messenger_v2.c */
563 int ceph_con_v2_try_read(struct ceph_connection *con);
564 int ceph_con_v2_try_write(struct ceph_connection *con);
565 void ceph_con_v2_revoke(struct ceph_connection *con);
566 void ceph_con_v2_revoke_incoming(struct ceph_connection *con);
567 bool ceph_con_v2_opened(struct ceph_connection *con);
568 void ceph_con_v2_reset_session(struct ceph_connection *con);
569 void ceph_con_v2_reset_protocol(struct ceph_connection *con);
570 
571 
572 extern const char *ceph_pr_addr(const struct ceph_entity_addr *addr);
573 
574 extern int ceph_parse_ips(const char *c, const char *end,
575 			  struct ceph_entity_addr *addr,
576 			  int max_count, int *count, char delim);
577 
578 extern int ceph_msgr_init(void);
579 extern void ceph_msgr_exit(void);
580 extern void ceph_msgr_flush(void);
581 
582 extern void ceph_messenger_init(struct ceph_messenger *msgr,
583 				struct ceph_entity_addr *myaddr);
584 extern void ceph_messenger_fini(struct ceph_messenger *msgr);
585 extern void ceph_messenger_reset_nonce(struct ceph_messenger *msgr);
586 
587 extern void ceph_con_init(struct ceph_connection *con, void *private,
588 			const struct ceph_connection_operations *ops,
589 			struct ceph_messenger *msgr);
590 extern void ceph_con_open(struct ceph_connection *con,
591 			  __u8 entity_type, __u64 entity_num,
592 			  struct ceph_entity_addr *addr);
593 extern bool ceph_con_opened(struct ceph_connection *con);
594 extern void ceph_con_close(struct ceph_connection *con);
595 extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
596 
597 extern void ceph_msg_revoke(struct ceph_msg *msg);
598 extern void ceph_msg_revoke_incoming(struct ceph_msg *msg);
599 
600 extern void ceph_con_keepalive(struct ceph_connection *con);
601 extern bool ceph_con_keepalive_expired(struct ceph_connection *con,
602 				       unsigned long interval);
603 
604 void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
605 			     size_t length, size_t alignment, bool own_pages);
606 extern void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
607 				struct ceph_pagelist *pagelist);
608 #ifdef CONFIG_BLOCK
609 void ceph_msg_data_add_bio(struct ceph_msg *msg, struct ceph_bio_iter *bio_pos,
610 			   u32 length);
611 #endif /* CONFIG_BLOCK */
612 void ceph_msg_data_add_bvecs(struct ceph_msg *msg,
613 			     struct ceph_bvec_iter *bvec_pos);
614 void ceph_msg_data_add_iter(struct ceph_msg *msg,
615 			    struct iov_iter *iter);
616 
617 struct ceph_msg *ceph_msg_new2(int type, int front_len, int max_data_items,
618 			       gfp_t flags, bool can_fail);
619 extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
620 				     bool can_fail);
621 
622 extern struct ceph_msg *ceph_msg_get(struct ceph_msg *msg);
623 extern void ceph_msg_put(struct ceph_msg *msg);
624 
625 extern void ceph_msg_dump(struct ceph_msg *msg);
626 
627 #endif
628