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rxrpc: Implement slow-start
[mirror_ubuntu-zesty-kernel.git] / net / rxrpc / ar-internal.h
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 <linux/atomic.h>
13 #include <linux/seqlock.h>
14 #include <net/sock.h>
15 #include <net/af_rxrpc.h>
16 #include <rxrpc/packet.h>
17
18 #if 0
19 #define CHECK_SLAB_OKAY(X) \
20 BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
21 (POISON_FREE << 8 | POISON_FREE))
22 #else
23 #define CHECK_SLAB_OKAY(X) do {} while (0)
24 #endif
25
26 #define FCRYPT_BSIZE 8
27 struct rxrpc_crypt {
28 union {
29 u8 x[FCRYPT_BSIZE];
30 __be32 n[2];
31 };
32 } __attribute__((aligned(8)));
33
34 #define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS))
35 #define rxrpc_queue_delayed_work(WS,D) \
36 queue_delayed_work(rxrpc_workqueue, (WS), (D))
37
38 struct rxrpc_connection;
39
40 /*
41 * Mark applied to socket buffers.
42 */
43 enum rxrpc_skb_mark {
44 RXRPC_SKB_MARK_DATA, /* data message */
45 RXRPC_SKB_MARK_FINAL_ACK, /* final ACK received message */
46 RXRPC_SKB_MARK_BUSY, /* server busy message */
47 RXRPC_SKB_MARK_REMOTE_ABORT, /* remote abort message */
48 RXRPC_SKB_MARK_LOCAL_ABORT, /* local abort message */
49 RXRPC_SKB_MARK_NET_ERROR, /* network error message */
50 RXRPC_SKB_MARK_LOCAL_ERROR, /* local error message */
51 RXRPC_SKB_MARK_NEW_CALL, /* local error message */
52 };
53
54 /*
55 * sk_state for RxRPC sockets
56 */
57 enum {
58 RXRPC_UNBOUND = 0,
59 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */
60 RXRPC_CLIENT_BOUND, /* client local address bound */
61 RXRPC_SERVER_BOUND, /* server local address bound */
62 RXRPC_SERVER_LISTENING, /* server listening for connections */
63 RXRPC_CLOSE, /* socket is being closed */
64 };
65
66 /*
67 * Service backlog preallocation.
68 *
69 * This contains circular buffers of preallocated peers, connections and calls
70 * for incoming service calls and their head and tail pointers. This allows
71 * calls to be set up in the data_ready handler, thereby avoiding the need to
72 * shuffle packets around so much.
73 */
74 struct rxrpc_backlog {
75 unsigned short peer_backlog_head;
76 unsigned short peer_backlog_tail;
77 unsigned short conn_backlog_head;
78 unsigned short conn_backlog_tail;
79 unsigned short call_backlog_head;
80 unsigned short call_backlog_tail;
81 #define RXRPC_BACKLOG_MAX 32
82 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX];
83 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
84 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX];
85 };
86
87 /*
88 * RxRPC socket definition
89 */
90 struct rxrpc_sock {
91 /* WARNING: sk has to be the first member */
92 struct sock sk;
93 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
94 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
95 struct rxrpc_local *local; /* local endpoint */
96 struct hlist_node listen_link; /* link in the local endpoint's listen list */
97 struct rxrpc_backlog *backlog; /* Preallocation for services */
98 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */
99 struct list_head sock_calls; /* List of calls owned by this socket */
100 struct list_head to_be_accepted; /* calls awaiting acceptance */
101 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */
102 rwlock_t recvmsg_lock; /* Lock for recvmsg_q */
103 struct key *key; /* security for this socket */
104 struct key *securities; /* list of server security descriptors */
105 struct rb_root calls; /* User ID -> call mapping */
106 unsigned long flags;
107 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */
108 rwlock_t call_lock; /* lock for calls */
109 u32 min_sec_level; /* minimum security level */
110 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT
111 bool exclusive; /* Exclusive connection for a client socket */
112 sa_family_t family; /* Protocol family created with */
113 struct sockaddr_rxrpc srx; /* local address */
114 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */
115 };
116
117 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
118
119 /*
120 * CPU-byteorder normalised Rx packet header.
121 */
122 struct rxrpc_host_header {
123 u32 epoch; /* client boot timestamp */
124 u32 cid; /* connection and channel ID */
125 u32 callNumber; /* call ID (0 for connection-level packets) */
126 u32 seq; /* sequence number of pkt in call stream */
127 u32 serial; /* serial number of pkt sent to network */
128 u8 type; /* packet type */
129 u8 flags; /* packet flags */
130 u8 userStatus; /* app-layer defined status */
131 u8 securityIndex; /* security protocol ID */
132 union {
133 u16 _rsvd; /* reserved */
134 u16 cksum; /* kerberos security checksum */
135 };
136 u16 serviceId; /* service ID */
137 } __packed;
138
139 /*
140 * RxRPC socket buffer private variables
141 * - max 48 bytes (struct sk_buff::cb)
142 */
143 struct rxrpc_skb_priv {
144 union {
145 u8 nr_jumbo; /* Number of jumbo subpackets */
146 };
147 union {
148 unsigned int offset; /* offset into buffer of next read */
149 int remain; /* amount of space remaining for next write */
150 u32 error; /* network error code */
151 };
152
153 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */
154 };
155
156 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
157
158 /*
159 * RxRPC security module interface
160 */
161 struct rxrpc_security {
162 const char *name; /* name of this service */
163 u8 security_index; /* security type provided */
164
165 /* Initialise a security service */
166 int (*init)(void);
167
168 /* Clean up a security service */
169 void (*exit)(void);
170
171 /* initialise a connection's security */
172 int (*init_connection_security)(struct rxrpc_connection *);
173
174 /* prime a connection's packet security */
175 int (*prime_packet_security)(struct rxrpc_connection *);
176
177 /* impose security on a packet */
178 int (*secure_packet)(struct rxrpc_call *,
179 struct sk_buff *,
180 size_t,
181 void *);
182
183 /* verify the security on a received packet */
184 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
185 unsigned int, unsigned int, rxrpc_seq_t, u16);
186
187 /* Locate the data in a received packet that has been verified. */
188 void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
189 unsigned int *, unsigned int *);
190
191 /* issue a challenge */
192 int (*issue_challenge)(struct rxrpc_connection *);
193
194 /* respond to a challenge */
195 int (*respond_to_challenge)(struct rxrpc_connection *,
196 struct sk_buff *,
197 u32 *);
198
199 /* verify a response */
200 int (*verify_response)(struct rxrpc_connection *,
201 struct sk_buff *,
202 u32 *);
203
204 /* clear connection security */
205 void (*clear)(struct rxrpc_connection *);
206 };
207
208 /*
209 * RxRPC local transport endpoint description
210 * - owned by a single AF_RXRPC socket
211 * - pointed to by transport socket struct sk_user_data
212 */
213 struct rxrpc_local {
214 struct rcu_head rcu;
215 atomic_t usage;
216 struct list_head link;
217 struct socket *socket; /* my UDP socket */
218 struct work_struct processor;
219 struct hlist_head services; /* services listening on this endpoint */
220 struct rw_semaphore defrag_sem; /* control re-enablement of IP DF bit */
221 struct sk_buff_head reject_queue; /* packets awaiting rejection */
222 struct sk_buff_head event_queue; /* endpoint event packets awaiting processing */
223 struct rb_root client_conns; /* Client connections by socket params */
224 spinlock_t client_conns_lock; /* Lock for client_conns */
225 spinlock_t lock; /* access lock */
226 rwlock_t services_lock; /* lock for services list */
227 int debug_id; /* debug ID for printks */
228 bool dead;
229 struct sockaddr_rxrpc srx; /* local address */
230 };
231
232 /*
233 * RxRPC remote transport endpoint definition
234 * - matched by local endpoint, remote port, address and protocol type
235 */
236 struct rxrpc_peer {
237 struct rcu_head rcu; /* This must be first */
238 atomic_t usage;
239 unsigned long hash_key;
240 struct hlist_node hash_link;
241 struct rxrpc_local *local;
242 struct hlist_head error_targets; /* targets for net error distribution */
243 struct work_struct error_distributor;
244 struct rb_root service_conns; /* Service connections */
245 seqlock_t service_conn_lock;
246 spinlock_t lock; /* access lock */
247 unsigned int if_mtu; /* interface MTU for this peer */
248 unsigned int mtu; /* network MTU for this peer */
249 unsigned int maxdata; /* data size (MTU - hdrsize) */
250 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */
251 int debug_id; /* debug ID for printks */
252 int error_report; /* Net (+0) or local (+1000000) to distribute */
253 #define RXRPC_LOCAL_ERROR_OFFSET 1000000
254 struct sockaddr_rxrpc srx; /* remote address */
255
256 /* calculated RTT cache */
257 #define RXRPC_RTT_CACHE_SIZE 32
258 ktime_t rtt_last_req; /* Time of last RTT request */
259 u64 rtt; /* Current RTT estimate (in nS) */
260 u64 rtt_sum; /* Sum of cache contents */
261 u64 rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
262 u8 rtt_cursor; /* next entry at which to insert */
263 u8 rtt_usage; /* amount of cache actually used */
264 };
265
266 /*
267 * Keys for matching a connection.
268 */
269 struct rxrpc_conn_proto {
270 union {
271 struct {
272 u32 epoch; /* epoch of this connection */
273 u32 cid; /* connection ID */
274 };
275 u64 index_key;
276 };
277 };
278
279 struct rxrpc_conn_parameters {
280 struct rxrpc_local *local; /* Representation of local endpoint */
281 struct rxrpc_peer *peer; /* Remote endpoint */
282 struct key *key; /* Security details */
283 bool exclusive; /* T if conn is exclusive */
284 u16 service_id; /* Service ID for this connection */
285 u32 security_level; /* Security level selected */
286 };
287
288 /*
289 * Bits in the connection flags.
290 */
291 enum rxrpc_conn_flag {
292 RXRPC_CONN_HAS_IDR, /* Has a client conn ID assigned */
293 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */
294 RXRPC_CONN_IN_CLIENT_CONNS, /* Conn is in local->client_conns */
295 RXRPC_CONN_EXPOSED, /* Conn has extra ref for exposure */
296 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */
297 RXRPC_CONN_COUNTED, /* Counted by rxrpc_nr_client_conns */
298 };
299
300 /*
301 * Events that can be raised upon a connection.
302 */
303 enum rxrpc_conn_event {
304 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */
305 };
306
307 /*
308 * The connection cache state.
309 */
310 enum rxrpc_conn_cache_state {
311 RXRPC_CONN_CLIENT_INACTIVE, /* Conn is not yet listed */
312 RXRPC_CONN_CLIENT_WAITING, /* Conn is on wait list, waiting for capacity */
313 RXRPC_CONN_CLIENT_ACTIVE, /* Conn is on active list, doing calls */
314 RXRPC_CONN_CLIENT_CULLED, /* Conn is culled and delisted, doing calls */
315 RXRPC_CONN_CLIENT_IDLE, /* Conn is on idle list, doing mostly nothing */
316 RXRPC_CONN__NR_CACHE_STATES
317 };
318
319 /*
320 * The connection protocol state.
321 */
322 enum rxrpc_conn_proto_state {
323 RXRPC_CONN_UNUSED, /* Connection not yet attempted */
324 RXRPC_CONN_CLIENT, /* Client connection */
325 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */
326 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */
327 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
328 RXRPC_CONN_SERVICE, /* Service secured connection */
329 RXRPC_CONN_REMOTELY_ABORTED, /* Conn aborted by peer */
330 RXRPC_CONN_LOCALLY_ABORTED, /* Conn aborted locally */
331 RXRPC_CONN__NR_STATES
332 };
333
334 /*
335 * RxRPC connection definition
336 * - matched by { local, peer, epoch, conn_id, direction }
337 * - each connection can only handle four simultaneous calls
338 */
339 struct rxrpc_connection {
340 struct rxrpc_conn_proto proto;
341 struct rxrpc_conn_parameters params;
342
343 atomic_t usage;
344 struct rcu_head rcu;
345 struct list_head cache_link;
346
347 spinlock_t channel_lock;
348 unsigned char active_chans; /* Mask of active channels */
349 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
350 struct list_head waiting_calls; /* Calls waiting for channels */
351 struct rxrpc_channel {
352 struct rxrpc_call __rcu *call; /* Active call */
353 u32 call_id; /* ID of current call */
354 u32 call_counter; /* Call ID counter */
355 u32 last_call; /* ID of last call */
356 u8 last_type; /* Type of last packet */
357 u16 last_service_id;
358 union {
359 u32 last_seq;
360 u32 last_abort;
361 };
362 } channels[RXRPC_MAXCALLS];
363
364 struct work_struct processor; /* connection event processor */
365 union {
366 struct rb_node client_node; /* Node in local->client_conns */
367 struct rb_node service_node; /* Node in peer->service_conns */
368 };
369 struct list_head proc_link; /* link in procfs list */
370 struct list_head link; /* link in master connection list */
371 struct sk_buff_head rx_queue; /* received conn-level packets */
372 const struct rxrpc_security *security; /* applied security module */
373 struct key *server_key; /* security for this service */
374 struct crypto_skcipher *cipher; /* encryption handle */
375 struct rxrpc_crypt csum_iv; /* packet checksum base */
376 unsigned long flags;
377 unsigned long events;
378 unsigned long idle_timestamp; /* Time at which last became idle */
379 spinlock_t state_lock; /* state-change lock */
380 enum rxrpc_conn_cache_state cache_state;
381 enum rxrpc_conn_proto_state state; /* current state of connection */
382 u32 local_abort; /* local abort code */
383 u32 remote_abort; /* remote abort code */
384 int debug_id; /* debug ID for printks */
385 atomic_t serial; /* packet serial number counter */
386 unsigned int hi_serial; /* highest serial number received */
387 u32 security_nonce; /* response re-use preventer */
388 u8 size_align; /* data size alignment (for security) */
389 u8 security_size; /* security header size */
390 u8 security_ix; /* security type */
391 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
392 };
393
394 /*
395 * Flags in call->flags.
396 */
397 enum rxrpc_call_flag {
398 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */
399 RXRPC_CALL_HAS_USERID, /* has a user ID attached */
400 RXRPC_CALL_IS_SERVICE, /* Call is service call */
401 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */
402 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */
403 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */
404 RXRPC_CALL_PINGING, /* Ping in process */
405 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */
406 };
407
408 /*
409 * Events that can be raised on a call.
410 */
411 enum rxrpc_call_event {
412 RXRPC_CALL_EV_ACK, /* need to generate ACK */
413 RXRPC_CALL_EV_ABORT, /* need to generate abort */
414 RXRPC_CALL_EV_TIMER, /* Timer expired */
415 RXRPC_CALL_EV_RESEND, /* Tx resend required */
416 };
417
418 /*
419 * The states that a call can be in.
420 */
421 enum rxrpc_call_state {
422 RXRPC_CALL_UNINITIALISED,
423 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */
424 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
425 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */
426 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */
427 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */
428 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */
429 RXRPC_CALL_SERVER_ACCEPTING, /* - server accepting request */
430 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
431 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */
432 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */
433 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */
434 RXRPC_CALL_COMPLETE, /* - call complete */
435 NR__RXRPC_CALL_STATES
436 };
437
438 /*
439 * Call completion condition (state == RXRPC_CALL_COMPLETE).
440 */
441 enum rxrpc_call_completion {
442 RXRPC_CALL_SUCCEEDED, /* - Normal termination */
443 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */
444 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */
445 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */
446 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */
447 NR__RXRPC_CALL_COMPLETIONS
448 };
449
450 /*
451 * Call Tx congestion management modes.
452 */
453 enum rxrpc_congest_mode {
454 RXRPC_CALL_SLOW_START,
455 RXRPC_CALL_CONGEST_AVOIDANCE,
456 RXRPC_CALL_PACKET_LOSS,
457 RXRPC_CALL_FAST_RETRANSMIT,
458 NR__RXRPC_CONGEST_MODES
459 };
460
461 /*
462 * RxRPC call definition
463 * - matched by { connection, call_id }
464 */
465 struct rxrpc_call {
466 struct rcu_head rcu;
467 struct rxrpc_connection *conn; /* connection carrying call */
468 struct rxrpc_peer *peer; /* Peer record for remote address */
469 struct rxrpc_sock __rcu *socket; /* socket responsible */
470 unsigned long ack_at; /* When deferred ACK needs to happen */
471 unsigned long resend_at; /* When next resend needs to happen */
472 unsigned long expire_at; /* When the call times out */
473 struct timer_list timer; /* Combined event timer */
474 struct work_struct processor; /* Event processor */
475 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */
476 struct list_head link; /* link in master call list */
477 struct list_head chan_wait_link; /* Link in conn->waiting_calls */
478 struct hlist_node error_link; /* link in error distribution list */
479 struct list_head accept_link; /* Link in rx->acceptq */
480 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */
481 struct list_head sock_link; /* Link in rx->sock_calls */
482 struct rb_node sock_node; /* Node in rx->calls */
483 struct sk_buff *tx_pending; /* Tx socket buffer being filled */
484 wait_queue_head_t waitq; /* Wait queue for channel or Tx */
485 __be32 crypto_buf[2]; /* Temporary packet crypto buffer */
486 unsigned long user_call_ID; /* user-defined call ID */
487 unsigned long flags;
488 unsigned long events;
489 spinlock_t lock;
490 rwlock_t state_lock; /* lock for state transition */
491 u32 abort_code; /* Local/remote abort code */
492 int error; /* Local error incurred */
493 enum rxrpc_call_state state; /* current state of call */
494 enum rxrpc_call_completion completion; /* Call completion condition */
495 atomic_t usage;
496 u16 service_id; /* service ID */
497 u8 security_ix; /* Security type */
498 u32 call_id; /* call ID on connection */
499 u32 cid; /* connection ID plus channel index */
500 int debug_id; /* debug ID for printks */
501 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */
502 unsigned short rx_pkt_len; /* Current recvmsg packet len */
503
504 /* Rx/Tx circular buffer, depending on phase.
505 *
506 * In the Rx phase, packets are annotated with 0 or the number of the
507 * segment of a jumbo packet each buffer refers to. There can be up to
508 * 47 segments in a maximum-size UDP packet.
509 *
510 * In the Tx phase, packets are annotated with which buffers have been
511 * acked.
512 */
513 #define RXRPC_RXTX_BUFF_SIZE 64
514 #define RXRPC_RXTX_BUFF_MASK (RXRPC_RXTX_BUFF_SIZE - 1)
515 #define RXRPC_INIT_RX_WINDOW_SIZE 32
516 struct sk_buff **rxtx_buffer;
517 u8 *rxtx_annotations;
518 #define RXRPC_TX_ANNO_ACK 0
519 #define RXRPC_TX_ANNO_UNACK 1
520 #define RXRPC_TX_ANNO_NAK 2
521 #define RXRPC_TX_ANNO_RETRANS 3
522 #define RXRPC_TX_ANNO_MASK 0x03
523 #define RXRPC_TX_ANNO_LAST 0x04
524 #define RXRPC_TX_ANNO_RESENT 0x08
525
526 #define RXRPC_RX_ANNO_JUMBO 0x3f /* Jumbo subpacket number + 1 if not zero */
527 #define RXRPC_RX_ANNO_JLAST 0x40 /* Set if last element of a jumbo packet */
528 #define RXRPC_RX_ANNO_VERIFIED 0x80 /* Set if verified and decrypted */
529 rxrpc_seq_t tx_hard_ack; /* Dead slot in buffer; the first transmitted but
530 * not hard-ACK'd packet follows this.
531 */
532 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */
533
534 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS
535 * is fixed, we keep these numbers in terms of segments (ie. DATA
536 * packets) rather than bytes.
537 */
538 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN
539 u8 cong_cwnd; /* Congestion window size */
540 u8 cong_extra; /* Extra to send for congestion management */
541 u8 cong_ssthresh; /* Slow-start threshold */
542 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */
543 u8 cong_dup_acks; /* Count of ACKs showing missing packets */
544 u8 cong_cumul_acks; /* Cumulative ACK count */
545 ktime_t cong_tstamp; /* Last time cwnd was changed */
546
547 rxrpc_seq_t rx_hard_ack; /* Dead slot in buffer; the first received but not
548 * consumed packet follows this.
549 */
550 rxrpc_seq_t rx_top; /* Highest Rx slot allocated. */
551 rxrpc_seq_t rx_expect_next; /* Expected next packet sequence number */
552 u8 rx_winsize; /* Size of Rx window */
553 u8 tx_winsize; /* Maximum size of Tx window */
554 bool tx_phase; /* T if transmission phase, F if receive phase */
555 u8 nr_jumbo_bad; /* Number of jumbo dups/exceeds-windows */
556
557 /* receive-phase ACK management */
558 u8 ackr_reason; /* reason to ACK */
559 u16 ackr_skew; /* skew on packet being ACK'd */
560 rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */
561 rxrpc_seq_t ackr_prev_seq; /* previous sequence number received */
562 rxrpc_seq_t ackr_consumed; /* Highest packet shown consumed */
563 rxrpc_seq_t ackr_seen; /* Highest packet shown seen */
564 rxrpc_serial_t ackr_ping; /* Last ping sent */
565 ktime_t ackr_ping_time; /* Time last ping sent */
566
567 /* transmission-phase ACK management */
568 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */
569 rxrpc_serial_t acks_latest; /* serial number of latest ACK received */
570 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
571 };
572
573 /*
574 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
575 */
576 struct rxrpc_ack_summary {
577 u8 ack_reason;
578 u8 nr_acks; /* Number of ACKs in packet */
579 u8 nr_nacks; /* Number of NACKs in packet */
580 u8 nr_new_acks; /* Number of new ACKs in packet */
581 u8 nr_new_nacks; /* Number of new NACKs in packet */
582 u8 nr_rot_new_acks; /* Number of rotated new ACKs */
583 bool new_low_nack; /* T if new low NACK found */
584 bool retrans_timeo; /* T if reTx due to timeout happened */
585 u8 flight_size; /* Number of unreceived transmissions */
586 /* Place to stash values for tracing */
587 enum rxrpc_congest_mode mode:8;
588 u8 cwnd;
589 u8 ssthresh;
590 u8 dup_acks;
591 u8 cumulative_acks;
592 };
593
594 enum rxrpc_skb_trace {
595 rxrpc_skb_rx_cleaned,
596 rxrpc_skb_rx_freed,
597 rxrpc_skb_rx_got,
598 rxrpc_skb_rx_lost,
599 rxrpc_skb_rx_received,
600 rxrpc_skb_rx_rotated,
601 rxrpc_skb_rx_purged,
602 rxrpc_skb_rx_seen,
603 rxrpc_skb_tx_cleaned,
604 rxrpc_skb_tx_freed,
605 rxrpc_skb_tx_got,
606 rxrpc_skb_tx_lost,
607 rxrpc_skb_tx_new,
608 rxrpc_skb_tx_rotated,
609 rxrpc_skb_tx_seen,
610 rxrpc_skb__nr_trace
611 };
612
613 extern const char rxrpc_skb_traces[rxrpc_skb__nr_trace][7];
614
615 enum rxrpc_conn_trace {
616 rxrpc_conn_new_client,
617 rxrpc_conn_new_service,
618 rxrpc_conn_queued,
619 rxrpc_conn_seen,
620 rxrpc_conn_got,
621 rxrpc_conn_put_client,
622 rxrpc_conn_put_service,
623 rxrpc_conn__nr_trace
624 };
625
626 extern const char rxrpc_conn_traces[rxrpc_conn__nr_trace][4];
627
628 enum rxrpc_client_trace {
629 rxrpc_client_activate_chans,
630 rxrpc_client_alloc,
631 rxrpc_client_chan_activate,
632 rxrpc_client_chan_disconnect,
633 rxrpc_client_chan_pass,
634 rxrpc_client_chan_unstarted,
635 rxrpc_client_cleanup,
636 rxrpc_client_count,
637 rxrpc_client_discard,
638 rxrpc_client_duplicate,
639 rxrpc_client_exposed,
640 rxrpc_client_replace,
641 rxrpc_client_to_active,
642 rxrpc_client_to_culled,
643 rxrpc_client_to_idle,
644 rxrpc_client_to_inactive,
645 rxrpc_client_to_waiting,
646 rxrpc_client_uncount,
647 rxrpc_client__nr_trace
648 };
649
650 extern const char rxrpc_client_traces[rxrpc_client__nr_trace][7];
651 extern const char rxrpc_conn_cache_states[RXRPC_CONN__NR_CACHE_STATES][5];
652
653 enum rxrpc_call_trace {
654 rxrpc_call_new_client,
655 rxrpc_call_new_service,
656 rxrpc_call_queued,
657 rxrpc_call_queued_ref,
658 rxrpc_call_seen,
659 rxrpc_call_connected,
660 rxrpc_call_release,
661 rxrpc_call_got,
662 rxrpc_call_got_userid,
663 rxrpc_call_got_kernel,
664 rxrpc_call_put,
665 rxrpc_call_put_userid,
666 rxrpc_call_put_kernel,
667 rxrpc_call_put_noqueue,
668 rxrpc_call_error,
669 rxrpc_call__nr_trace
670 };
671
672 extern const char rxrpc_call_traces[rxrpc_call__nr_trace][4];
673
674 enum rxrpc_transmit_trace {
675 rxrpc_transmit_wait,
676 rxrpc_transmit_queue,
677 rxrpc_transmit_queue_last,
678 rxrpc_transmit_rotate,
679 rxrpc_transmit_rotate_last,
680 rxrpc_transmit_await_reply,
681 rxrpc_transmit_end,
682 rxrpc_transmit__nr_trace
683 };
684
685 extern const char rxrpc_transmit_traces[rxrpc_transmit__nr_trace][4];
686
687 enum rxrpc_receive_trace {
688 rxrpc_receive_incoming,
689 rxrpc_receive_queue,
690 rxrpc_receive_queue_last,
691 rxrpc_receive_front,
692 rxrpc_receive_rotate,
693 rxrpc_receive_end,
694 rxrpc_receive__nr_trace
695 };
696
697 extern const char rxrpc_receive_traces[rxrpc_receive__nr_trace][4];
698
699 enum rxrpc_recvmsg_trace {
700 rxrpc_recvmsg_enter,
701 rxrpc_recvmsg_wait,
702 rxrpc_recvmsg_dequeue,
703 rxrpc_recvmsg_hole,
704 rxrpc_recvmsg_next,
705 rxrpc_recvmsg_cont,
706 rxrpc_recvmsg_full,
707 rxrpc_recvmsg_data_return,
708 rxrpc_recvmsg_terminal,
709 rxrpc_recvmsg_to_be_accepted,
710 rxrpc_recvmsg_return,
711 rxrpc_recvmsg__nr_trace
712 };
713
714 extern const char rxrpc_recvmsg_traces[rxrpc_recvmsg__nr_trace][5];
715
716 enum rxrpc_rtt_tx_trace {
717 rxrpc_rtt_tx_ping,
718 rxrpc_rtt_tx_data,
719 rxrpc_rtt_tx__nr_trace
720 };
721
722 extern const char rxrpc_rtt_tx_traces[rxrpc_rtt_tx__nr_trace][5];
723
724 enum rxrpc_rtt_rx_trace {
725 rxrpc_rtt_rx_ping_response,
726 rxrpc_rtt_rx_requested_ack,
727 rxrpc_rtt_rx__nr_trace
728 };
729
730 extern const char rxrpc_rtt_rx_traces[rxrpc_rtt_rx__nr_trace][5];
731
732 enum rxrpc_timer_trace {
733 rxrpc_timer_begin,
734 rxrpc_timer_init_for_reply,
735 rxrpc_timer_expired,
736 rxrpc_timer_set_for_ack,
737 rxrpc_timer_set_for_resend,
738 rxrpc_timer_set_for_send,
739 rxrpc_timer__nr_trace
740 };
741
742 extern const char rxrpc_timer_traces[rxrpc_timer__nr_trace][8];
743
744 enum rxrpc_propose_ack_trace {
745 rxrpc_propose_ack_client_tx_end,
746 rxrpc_propose_ack_input_data,
747 rxrpc_propose_ack_ping_for_lost_ack,
748 rxrpc_propose_ack_ping_for_lost_reply,
749 rxrpc_propose_ack_ping_for_params,
750 rxrpc_propose_ack_respond_to_ack,
751 rxrpc_propose_ack_respond_to_ping,
752 rxrpc_propose_ack_retry_tx,
753 rxrpc_propose_ack_rotate_rx,
754 rxrpc_propose_ack_terminal_ack,
755 rxrpc_propose_ack__nr_trace
756 };
757
758 enum rxrpc_propose_ack_outcome {
759 rxrpc_propose_ack_use,
760 rxrpc_propose_ack_update,
761 rxrpc_propose_ack_subsume,
762 rxrpc_propose_ack__nr_outcomes
763 };
764
765 extern const char rxrpc_propose_ack_traces[rxrpc_propose_ack__nr_trace][8];
766 extern const char *const rxrpc_propose_ack_outcomes[rxrpc_propose_ack__nr_outcomes];
767
768 enum rxrpc_congest_change {
769 rxrpc_cong_begin_retransmission,
770 rxrpc_cong_cleared_nacks,
771 rxrpc_cong_new_low_nack,
772 rxrpc_cong_no_change,
773 rxrpc_cong_progress,
774 rxrpc_cong_retransmit_again,
775 rxrpc_cong_rtt_window_end,
776 rxrpc_cong_saw_nack,
777 rxrpc_congest__nr_change
778 };
779
780 extern const char rxrpc_congest_modes[NR__RXRPC_CONGEST_MODES][10];
781 extern const char rxrpc_congest_changes[rxrpc_congest__nr_change][9];
782
783 extern const char *const rxrpc_pkts[];
784 extern const char const rxrpc_ack_names[RXRPC_ACK__INVALID + 1][4];
785
786 #include <trace/events/rxrpc.h>
787
788 /*
789 * af_rxrpc.c
790 */
791 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
792 extern u32 rxrpc_epoch;
793 extern atomic_t rxrpc_debug_id;
794 extern struct workqueue_struct *rxrpc_workqueue;
795
796 /*
797 * call_accept.c
798 */
799 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
800 void rxrpc_discard_prealloc(struct rxrpc_sock *);
801 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
802 struct rxrpc_connection *,
803 struct sk_buff *);
804 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
805 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
806 rxrpc_notify_rx_t);
807 int rxrpc_reject_call(struct rxrpc_sock *);
808
809 /*
810 * call_event.c
811 */
812 void rxrpc_set_timer(struct rxrpc_call *, enum rxrpc_timer_trace);
813 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
814 enum rxrpc_propose_ack_trace);
815 void rxrpc_process_call(struct work_struct *);
816
817 /*
818 * call_object.c
819 */
820 extern const char *const rxrpc_call_states[];
821 extern const char *const rxrpc_call_completions[];
822 extern unsigned int rxrpc_max_call_lifetime;
823 extern struct kmem_cache *rxrpc_call_jar;
824 extern struct list_head rxrpc_calls;
825 extern rwlock_t rxrpc_call_lock;
826
827 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
828 struct rxrpc_call *rxrpc_alloc_call(gfp_t);
829 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
830 struct rxrpc_conn_parameters *,
831 struct sockaddr_rxrpc *,
832 unsigned long, gfp_t);
833 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
834 struct sk_buff *);
835 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
836 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
837 bool __rxrpc_queue_call(struct rxrpc_call *);
838 bool rxrpc_queue_call(struct rxrpc_call *);
839 void rxrpc_see_call(struct rxrpc_call *);
840 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
841 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
842 void rxrpc_cleanup_call(struct rxrpc_call *);
843 void __exit rxrpc_destroy_all_calls(void);
844
845 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
846 {
847 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
848 }
849
850 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
851 {
852 return !rxrpc_is_service_call(call);
853 }
854
855 /*
856 * Transition a call to the complete state.
857 */
858 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
859 enum rxrpc_call_completion compl,
860 u32 abort_code,
861 int error)
862 {
863 if (call->state < RXRPC_CALL_COMPLETE) {
864 call->abort_code = abort_code;
865 call->error = error;
866 call->completion = compl,
867 call->state = RXRPC_CALL_COMPLETE;
868 wake_up(&call->waitq);
869 return true;
870 }
871 return false;
872 }
873
874 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
875 enum rxrpc_call_completion compl,
876 u32 abort_code,
877 int error)
878 {
879 bool ret;
880
881 write_lock_bh(&call->state_lock);
882 ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
883 write_unlock_bh(&call->state_lock);
884 return ret;
885 }
886
887 /*
888 * Record that a call successfully completed.
889 */
890 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
891 {
892 return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
893 }
894
895 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
896 {
897 bool ret;
898
899 write_lock_bh(&call->state_lock);
900 ret = __rxrpc_call_completed(call);
901 write_unlock_bh(&call->state_lock);
902 return ret;
903 }
904
905 /*
906 * Record that a call is locally aborted.
907 */
908 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
909 rxrpc_seq_t seq,
910 u32 abort_code, int error)
911 {
912 trace_rxrpc_abort(why, call->cid, call->call_id, seq,
913 abort_code, error);
914 return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
915 abort_code, error);
916 }
917
918 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
919 rxrpc_seq_t seq, u32 abort_code, int error)
920 {
921 bool ret;
922
923 write_lock_bh(&call->state_lock);
924 ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
925 write_unlock_bh(&call->state_lock);
926 return ret;
927 }
928
929 /*
930 * conn_client.c
931 */
932 extern unsigned int rxrpc_max_client_connections;
933 extern unsigned int rxrpc_reap_client_connections;
934 extern unsigned int rxrpc_conn_idle_client_expiry;
935 extern unsigned int rxrpc_conn_idle_client_fast_expiry;
936 extern struct idr rxrpc_client_conn_ids;
937
938 void rxrpc_destroy_client_conn_ids(void);
939 int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
940 struct sockaddr_rxrpc *, gfp_t);
941 void rxrpc_expose_client_call(struct rxrpc_call *);
942 void rxrpc_disconnect_client_call(struct rxrpc_call *);
943 void rxrpc_put_client_conn(struct rxrpc_connection *);
944 void __exit rxrpc_destroy_all_client_connections(void);
945
946 /*
947 * conn_event.c
948 */
949 void rxrpc_process_connection(struct work_struct *);
950
951 /*
952 * conn_object.c
953 */
954 extern unsigned int rxrpc_connection_expiry;
955 extern struct list_head rxrpc_connections;
956 extern struct list_head rxrpc_connection_proc_list;
957 extern rwlock_t rxrpc_connection_lock;
958
959 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
960 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
961 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
962 struct sk_buff *);
963 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
964 void rxrpc_disconnect_call(struct rxrpc_call *);
965 void rxrpc_kill_connection(struct rxrpc_connection *);
966 bool rxrpc_queue_conn(struct rxrpc_connection *);
967 void rxrpc_see_connection(struct rxrpc_connection *);
968 void rxrpc_get_connection(struct rxrpc_connection *);
969 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
970 void rxrpc_put_service_conn(struct rxrpc_connection *);
971 void __exit rxrpc_destroy_all_connections(void);
972
973 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
974 {
975 return conn->out_clientflag;
976 }
977
978 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
979 {
980 return !rxrpc_conn_is_client(conn);
981 }
982
983 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
984 {
985 if (!conn)
986 return;
987
988 if (rxrpc_conn_is_client(conn))
989 rxrpc_put_client_conn(conn);
990 else
991 rxrpc_put_service_conn(conn);
992 }
993
994 /*
995 * conn_service.c
996 */
997 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
998 struct sk_buff *);
999 struct rxrpc_connection *rxrpc_prealloc_service_connection(gfp_t);
1000 void rxrpc_new_incoming_connection(struct rxrpc_connection *, struct sk_buff *);
1001 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
1002
1003 /*
1004 * input.c
1005 */
1006 void rxrpc_data_ready(struct sock *);
1007
1008 /*
1009 * insecure.c
1010 */
1011 extern const struct rxrpc_security rxrpc_no_security;
1012
1013 /*
1014 * key.c
1015 */
1016 extern struct key_type key_type_rxrpc;
1017 extern struct key_type key_type_rxrpc_s;
1018
1019 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
1020 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
1021 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time_t,
1022 u32);
1023
1024 /*
1025 * local_event.c
1026 */
1027 extern void rxrpc_process_local_events(struct rxrpc_local *);
1028
1029 /*
1030 * local_object.c
1031 */
1032 struct rxrpc_local *rxrpc_lookup_local(const struct sockaddr_rxrpc *);
1033 void __rxrpc_put_local(struct rxrpc_local *);
1034 void __exit rxrpc_destroy_all_locals(void);
1035
1036 static inline void rxrpc_get_local(struct rxrpc_local *local)
1037 {
1038 atomic_inc(&local->usage);
1039 }
1040
1041 static inline
1042 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
1043 {
1044 return atomic_inc_not_zero(&local->usage) ? local : NULL;
1045 }
1046
1047 static inline void rxrpc_put_local(struct rxrpc_local *local)
1048 {
1049 if (local && atomic_dec_and_test(&local->usage))
1050 __rxrpc_put_local(local);
1051 }
1052
1053 static inline void rxrpc_queue_local(struct rxrpc_local *local)
1054 {
1055 rxrpc_queue_work(&local->processor);
1056 }
1057
1058 /*
1059 * misc.c
1060 */
1061 extern unsigned int rxrpc_max_backlog __read_mostly;
1062 extern unsigned int rxrpc_requested_ack_delay;
1063 extern unsigned int rxrpc_soft_ack_delay;
1064 extern unsigned int rxrpc_idle_ack_delay;
1065 extern unsigned int rxrpc_rx_window_size;
1066 extern unsigned int rxrpc_rx_mtu;
1067 extern unsigned int rxrpc_rx_jumbo_max;
1068 extern unsigned int rxrpc_resend_timeout;
1069
1070 extern const s8 rxrpc_ack_priority[];
1071
1072 /*
1073 * output.c
1074 */
1075 int rxrpc_send_call_packet(struct rxrpc_call *, u8);
1076 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *);
1077 void rxrpc_reject_packets(struct rxrpc_local *);
1078
1079 /*
1080 * peer_event.c
1081 */
1082 void rxrpc_error_report(struct sock *);
1083 void rxrpc_peer_error_distributor(struct work_struct *);
1084 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
1085 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1086
1087 /*
1088 * peer_object.c
1089 */
1090 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1091 const struct sockaddr_rxrpc *);
1092 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *,
1093 struct sockaddr_rxrpc *, gfp_t);
1094 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
1095 struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *,
1096 struct rxrpc_peer *);
1097
1098 static inline struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
1099 {
1100 atomic_inc(&peer->usage);
1101 return peer;
1102 }
1103
1104 static inline
1105 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
1106 {
1107 return atomic_inc_not_zero(&peer->usage) ? peer : NULL;
1108 }
1109
1110 extern void __rxrpc_put_peer(struct rxrpc_peer *peer);
1111 static inline void rxrpc_put_peer(struct rxrpc_peer *peer)
1112 {
1113 if (peer && atomic_dec_and_test(&peer->usage))
1114 __rxrpc_put_peer(peer);
1115 }
1116
1117 /*
1118 * proc.c
1119 */
1120 extern const struct file_operations rxrpc_call_seq_fops;
1121 extern const struct file_operations rxrpc_connection_seq_fops;
1122
1123 /*
1124 * recvmsg.c
1125 */
1126 void rxrpc_notify_socket(struct rxrpc_call *);
1127 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1128
1129 /*
1130 * rxkad.c
1131 */
1132 #ifdef CONFIG_RXKAD
1133 extern const struct rxrpc_security rxkad;
1134 #endif
1135
1136 /*
1137 * security.c
1138 */
1139 int __init rxrpc_init_security(void);
1140 void rxrpc_exit_security(void);
1141 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1142 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1143
1144 /*
1145 * sendmsg.c
1146 */
1147 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1148
1149 /*
1150 * skbuff.c
1151 */
1152 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1153 void rxrpc_packet_destructor(struct sk_buff *);
1154 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1155 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1156 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1157 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1158 void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace);
1159 void rxrpc_purge_queue(struct sk_buff_head *);
1160
1161 /*
1162 * sysctl.c
1163 */
1164 #ifdef CONFIG_SYSCTL
1165 extern int __init rxrpc_sysctl_init(void);
1166 extern void rxrpc_sysctl_exit(void);
1167 #else
1168 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1169 static inline void rxrpc_sysctl_exit(void) {}
1170 #endif
1171
1172 /*
1173 * utils.c
1174 */
1175 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1176
1177 static inline bool before(u32 seq1, u32 seq2)
1178 {
1179 return (s32)(seq1 - seq2) < 0;
1180 }
1181 static inline bool before_eq(u32 seq1, u32 seq2)
1182 {
1183 return (s32)(seq1 - seq2) <= 0;
1184 }
1185 static inline bool after(u32 seq1, u32 seq2)
1186 {
1187 return (s32)(seq1 - seq2) > 0;
1188 }
1189 static inline bool after_eq(u32 seq1, u32 seq2)
1190 {
1191 return (s32)(seq1 - seq2) >= 0;
1192 }
1193
1194 /*
1195 * debug tracing
1196 */
1197 extern unsigned int rxrpc_debug;
1198
1199 #define dbgprintk(FMT,...) \
1200 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1201
1202 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1203 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1204 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1205 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1206 #define knet(FMT,...) dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1207
1208
1209 #if defined(__KDEBUG)
1210 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1211 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1212 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1213 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1214 #define _net(FMT,...) knet(FMT,##__VA_ARGS__)
1215
1216 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1217 #define RXRPC_DEBUG_KENTER 0x01
1218 #define RXRPC_DEBUG_KLEAVE 0x02
1219 #define RXRPC_DEBUG_KDEBUG 0x04
1220 #define RXRPC_DEBUG_KPROTO 0x08
1221 #define RXRPC_DEBUG_KNET 0x10
1222
1223 #define _enter(FMT,...) \
1224 do { \
1225 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1226 kenter(FMT,##__VA_ARGS__); \
1227 } while (0)
1228
1229 #define _leave(FMT,...) \
1230 do { \
1231 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1232 kleave(FMT,##__VA_ARGS__); \
1233 } while (0)
1234
1235 #define _debug(FMT,...) \
1236 do { \
1237 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1238 kdebug(FMT,##__VA_ARGS__); \
1239 } while (0)
1240
1241 #define _proto(FMT,...) \
1242 do { \
1243 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1244 kproto(FMT,##__VA_ARGS__); \
1245 } while (0)
1246
1247 #define _net(FMT,...) \
1248 do { \
1249 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET)) \
1250 knet(FMT,##__VA_ARGS__); \
1251 } while (0)
1252
1253 #else
1254 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1255 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1256 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1257 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1258 #define _net(FMT,...) no_printk("@@@ "FMT ,##__VA_ARGS__)
1259 #endif
1260
1261 /*
1262 * debug assertion checking
1263 */
1264 #if 1 // defined(__KDEBUGALL)
1265
1266 #define ASSERT(X) \
1267 do { \
1268 if (unlikely(!(X))) { \
1269 pr_err("Assertion failed\n"); \
1270 BUG(); \
1271 } \
1272 } while (0)
1273
1274 #define ASSERTCMP(X, OP, Y) \
1275 do { \
1276 __typeof__(X) _x = (X); \
1277 __typeof__(Y) _y = (__typeof__(X))(Y); \
1278 if (unlikely(!(_x OP _y))) { \
1279 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1280 (unsigned long)_x, (unsigned long)_x, #OP, \
1281 (unsigned long)_y, (unsigned long)_y); \
1282 BUG(); \
1283 } \
1284 } while (0)
1285
1286 #define ASSERTIF(C, X) \
1287 do { \
1288 if (unlikely((C) && !(X))) { \
1289 pr_err("Assertion failed\n"); \
1290 BUG(); \
1291 } \
1292 } while (0)
1293
1294 #define ASSERTIFCMP(C, X, OP, Y) \
1295 do { \
1296 __typeof__(X) _x = (X); \
1297 __typeof__(Y) _y = (__typeof__(X))(Y); \
1298 if (unlikely((C) && !(_x OP _y))) { \
1299 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1300 (unsigned long)_x, (unsigned long)_x, #OP, \
1301 (unsigned long)_y, (unsigned long)_y); \
1302 BUG(); \
1303 } \
1304 } while (0)
1305
1306 #else
1307
1308 #define ASSERT(X) \
1309 do { \
1310 } while (0)
1311
1312 #define ASSERTCMP(X, OP, Y) \
1313 do { \
1314 } while (0)
1315
1316 #define ASSERTIF(C, X) \
1317 do { \
1318 } while (0)
1319
1320 #define ASSERTIFCMP(C, X, OP, Y) \
1321 do { \
1322 } while (0)
1323
1324 #endif /* __KDEBUGALL */
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