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Merge tag 'dmaengine-fix-5.2' of git://git.infradead.org/users/vkoul/slave-dma
[linux-2.6/linux-2.6-arm.git] / net / rxrpc / ar-internal.h
blob80335b4ee4fd6c2b1ae39bed5b9089e35c292b84
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* AF_RXRPC internal definitions
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #include <linux/atomic.h>
9 #include <linux/seqlock.h>
10 #include <net/net_namespace.h>
11 #include <net/netns/generic.h>
12 #include <net/sock.h>
13 #include <net/af_rxrpc.h>
14 #include "protocol.h"
15
16 #if 0
17 #define CHECK_SLAB_OKAY(X) \
18 BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
19 (POISON_FREE << 8 | POISON_FREE))
20 #else
21 #define CHECK_SLAB_OKAY(X) do {} while (0)
22 #endif
23
24 #define FCRYPT_BSIZE 8
25 struct rxrpc_crypt {
26 union {
27 u8 x[FCRYPT_BSIZE];
28 __be32 n[2];
29 };
30 } __attribute__((aligned(8)));
31
32 #define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS))
33 #define rxrpc_queue_delayed_work(WS,D) \
34 queue_delayed_work(rxrpc_workqueue, (WS), (D))
35
36 struct rxrpc_connection;
37
38 /*
39 * Mark applied to socket buffers in skb->mark. skb->priority is used
40 * to pass supplementary information.
41 */
42 enum rxrpc_skb_mark {
43 RXRPC_SKB_MARK_REJECT_BUSY, /* Reject with BUSY */
44 RXRPC_SKB_MARK_REJECT_ABORT, /* Reject with ABORT (code in skb->priority) */
45 };
46
47 /*
48 * sk_state for RxRPC sockets
49 */
50 enum {
51 RXRPC_UNBOUND = 0,
52 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */
53 RXRPC_CLIENT_BOUND, /* client local address bound */
54 RXRPC_SERVER_BOUND, /* server local address bound */
55 RXRPC_SERVER_BOUND2, /* second server local address bound */
56 RXRPC_SERVER_LISTENING, /* server listening for connections */
57 RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */
58 RXRPC_CLOSE, /* socket is being closed */
59 };
60
61 /*
62 * Per-network namespace data.
63 */
64 struct rxrpc_net {
65 struct proc_dir_entry *proc_net; /* Subdir in /proc/net */
66 u32 epoch; /* Local epoch for detecting local-end reset */
67 struct list_head calls; /* List of calls active in this namespace */
68 rwlock_t call_lock; /* Lock for ->calls */
69 atomic_t nr_calls; /* Count of allocated calls */
70
71 atomic_t nr_conns;
72 struct list_head conn_proc_list; /* List of conns in this namespace for proc */
73 struct list_head service_conns; /* Service conns in this namespace */
74 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */
75 struct work_struct service_conn_reaper;
76 struct timer_list service_conn_reap_timer;
77
78 unsigned int nr_client_conns;
79 unsigned int nr_active_client_conns;
80 bool kill_all_client_conns;
81 bool live;
82 spinlock_t client_conn_cache_lock; /* Lock for ->*_client_conns */
83 spinlock_t client_conn_discard_lock; /* Prevent multiple discarders */
84 struct list_head waiting_client_conns;
85 struct list_head active_client_conns;
86 struct list_head idle_client_conns;
87 struct work_struct client_conn_reaper;
88 struct timer_list client_conn_reap_timer;
89
90 struct list_head local_endpoints;
91 struct mutex local_mutex; /* Lock for ->local_endpoints */
92
93 DECLARE_HASHTABLE (peer_hash, 10);
94 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */
95
96 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
97 u8 peer_keepalive_cursor;
98 time64_t peer_keepalive_base;
99 struct list_head peer_keepalive[32];
100 struct list_head peer_keepalive_new;
101 struct timer_list peer_keepalive_timer;
102 struct work_struct peer_keepalive_work;
103 };
104
105 /*
106 * Service backlog preallocation.
107 *
108 * This contains circular buffers of preallocated peers, connections and calls
109 * for incoming service calls and their head and tail pointers. This allows
110 * calls to be set up in the data_ready handler, thereby avoiding the need to
111 * shuffle packets around so much.
112 */
113 struct rxrpc_backlog {
114 unsigned short peer_backlog_head;
115 unsigned short peer_backlog_tail;
116 unsigned short conn_backlog_head;
117 unsigned short conn_backlog_tail;
118 unsigned short call_backlog_head;
119 unsigned short call_backlog_tail;
120 #define RXRPC_BACKLOG_MAX 32
121 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX];
122 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
123 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX];
124 };
125
126 /*
127 * RxRPC socket definition
128 */
129 struct rxrpc_sock {
130 /* WARNING: sk has to be the first member */
131 struct sock sk;
132 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
133 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
134 struct rxrpc_local *local; /* local endpoint */
135 struct rxrpc_backlog *backlog; /* Preallocation for services */
136 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */
137 struct list_head sock_calls; /* List of calls owned by this socket */
138 struct list_head to_be_accepted; /* calls awaiting acceptance */
139 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */
140 rwlock_t recvmsg_lock; /* Lock for recvmsg_q */
141 struct key *key; /* security for this socket */
142 struct key *securities; /* list of server security descriptors */
143 struct rb_root calls; /* User ID -> call mapping */
144 unsigned long flags;
145 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */
146 rwlock_t call_lock; /* lock for calls */
147 u32 min_sec_level; /* minimum security level */
148 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT
149 bool exclusive; /* Exclusive connection for a client socket */
150 u16 second_service; /* Additional service bound to the endpoint */
151 struct {
152 /* Service upgrade information */
153 u16 from; /* Service ID to upgrade (if not 0) */
154 u16 to; /* service ID to upgrade to */
155 } service_upgrade;
156 sa_family_t family; /* Protocol family created with */
157 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */
158 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */
159 };
160
161 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
162
163 /*
164 * CPU-byteorder normalised Rx packet header.
165 */
166 struct rxrpc_host_header {
167 u32 epoch; /* client boot timestamp */
168 u32 cid; /* connection and channel ID */
169 u32 callNumber; /* call ID (0 for connection-level packets) */
170 u32 seq; /* sequence number of pkt in call stream */
171 u32 serial; /* serial number of pkt sent to network */
172 u8 type; /* packet type */
173 u8 flags; /* packet flags */
174 u8 userStatus; /* app-layer defined status */
175 u8 securityIndex; /* security protocol ID */
176 union {
177 u16 _rsvd; /* reserved */
178 u16 cksum; /* kerberos security checksum */
179 };
180 u16 serviceId; /* service ID */
181 } __packed;
182
183 /*
184 * RxRPC socket buffer private variables
185 * - max 48 bytes (struct sk_buff::cb)
186 */
187 struct rxrpc_skb_priv {
188 union {
189 u8 nr_jumbo; /* Number of jumbo subpackets */
190 };
191 union {
192 int remain; /* amount of space remaining for next write */
193 };
194
195 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */
196 };
197
198 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
199
200 /*
201 * RxRPC security module interface
202 */
203 struct rxrpc_security {
204 const char *name; /* name of this service */
205 u8 security_index; /* security type provided */
206
207 /* Initialise a security service */
208 int (*init)(void);
209
210 /* Clean up a security service */
211 void (*exit)(void);
212
213 /* initialise a connection's security */
214 int (*init_connection_security)(struct rxrpc_connection *);
215
216 /* prime a connection's packet security */
217 int (*prime_packet_security)(struct rxrpc_connection *);
218
219 /* impose security on a packet */
220 int (*secure_packet)(struct rxrpc_call *,
221 struct sk_buff *,
222 size_t,
223 void *);
224
225 /* verify the security on a received packet */
226 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
227 unsigned int, unsigned int, rxrpc_seq_t, u16);
228
229 /* Locate the data in a received packet that has been verified. */
230 void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
231 unsigned int *, unsigned int *);
232
233 /* issue a challenge */
234 int (*issue_challenge)(struct rxrpc_connection *);
235
236 /* respond to a challenge */
237 int (*respond_to_challenge)(struct rxrpc_connection *,
238 struct sk_buff *,
239 u32 *);
240
241 /* verify a response */
242 int (*verify_response)(struct rxrpc_connection *,
243 struct sk_buff *,
244 u32 *);
245
246 /* clear connection security */
247 void (*clear)(struct rxrpc_connection *);
248 };
249
250 /*
251 * RxRPC local transport endpoint description
252 * - owned by a single AF_RXRPC socket
253 * - pointed to by transport socket struct sk_user_data
254 */
255 struct rxrpc_local {
256 struct rcu_head rcu;
257 atomic_t usage;
258 struct rxrpc_net *rxnet; /* The network ns in which this resides */
259 struct list_head link;
260 struct socket *socket; /* my UDP socket */
261 struct work_struct processor;
262 struct rxrpc_sock __rcu *service; /* Service(s) listening on this endpoint */
263 struct rw_semaphore defrag_sem; /* control re-enablement of IP DF bit */
264 struct sk_buff_head reject_queue; /* packets awaiting rejection */
265 struct sk_buff_head event_queue; /* endpoint event packets awaiting processing */
266 struct rb_root client_conns; /* Client connections by socket params */
267 spinlock_t client_conns_lock; /* Lock for client_conns */
268 spinlock_t lock; /* access lock */
269 rwlock_t services_lock; /* lock for services list */
270 int debug_id; /* debug ID for printks */
271 bool dead;
272 bool service_closed; /* Service socket closed */
273 struct sockaddr_rxrpc srx; /* local address */
274 };
275
276 /*
277 * RxRPC remote transport endpoint definition
278 * - matched by local endpoint, remote port, address and protocol type
279 */
280 struct rxrpc_peer {
281 struct rcu_head rcu; /* This must be first */
282 atomic_t usage;
283 unsigned long hash_key;
284 struct hlist_node hash_link;
285 struct rxrpc_local *local;
286 struct hlist_head error_targets; /* targets for net error distribution */
287 struct rb_root service_conns; /* Service connections */
288 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */
289 time64_t last_tx_at; /* Last time packet sent here */
290 seqlock_t service_conn_lock;
291 spinlock_t lock; /* access lock */
292 unsigned int if_mtu; /* interface MTU for this peer */
293 unsigned int mtu; /* network MTU for this peer */
294 unsigned int maxdata; /* data size (MTU - hdrsize) */
295 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */
296 int debug_id; /* debug ID for printks */
297 struct sockaddr_rxrpc srx; /* remote address */
298
299 /* calculated RTT cache */
300 #define RXRPC_RTT_CACHE_SIZE 32
301 spinlock_t rtt_input_lock; /* RTT lock for input routine */
302 ktime_t rtt_last_req; /* Time of last RTT request */
303 u64 rtt; /* Current RTT estimate (in nS) */
304 u64 rtt_sum; /* Sum of cache contents */
305 u64 rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
306 u8 rtt_cursor; /* next entry at which to insert */
307 u8 rtt_usage; /* amount of cache actually used */
308
309 u8 cong_cwnd; /* Congestion window size */
310 };
311
312 /*
313 * Keys for matching a connection.
314 */
315 struct rxrpc_conn_proto {
316 union {
317 struct {
318 u32 epoch; /* epoch of this connection */
319 u32 cid; /* connection ID */
320 };
321 u64 index_key;
322 };
323 };
324
325 struct rxrpc_conn_parameters {
326 struct rxrpc_local *local; /* Representation of local endpoint */
327 struct rxrpc_peer *peer; /* Remote endpoint */
328 struct key *key; /* Security details */
329 bool exclusive; /* T if conn is exclusive */
330 bool upgrade; /* T if service ID can be upgraded */
331 u16 service_id; /* Service ID for this connection */
332 u32 security_level; /* Security level selected */
333 };
334
335 /*
336 * Bits in the connection flags.
337 */
338 enum rxrpc_conn_flag {
339 RXRPC_CONN_HAS_IDR, /* Has a client conn ID assigned */
340 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */
341 RXRPC_CONN_IN_CLIENT_CONNS, /* Conn is in local->client_conns */
342 RXRPC_CONN_EXPOSED, /* Conn has extra ref for exposure */
343 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */
344 RXRPC_CONN_COUNTED, /* Counted by rxrpc_nr_client_conns */
345 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
346 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */
347 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */
348 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */
349 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */
350 };
351
352 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \
353 (1UL << RXRPC_CONN_FINAL_ACK_1) | \
354 (1UL << RXRPC_CONN_FINAL_ACK_2) | \
355 (1UL << RXRPC_CONN_FINAL_ACK_3))
356
357 /*
358 * Events that can be raised upon a connection.
359 */
360 enum rxrpc_conn_event {
361 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */
362 };
363
364 /*
365 * The connection cache state.
366 */
367 enum rxrpc_conn_cache_state {
368 RXRPC_CONN_CLIENT_INACTIVE, /* Conn is not yet listed */
369 RXRPC_CONN_CLIENT_WAITING, /* Conn is on wait list, waiting for capacity */
370 RXRPC_CONN_CLIENT_ACTIVE, /* Conn is on active list, doing calls */
371 RXRPC_CONN_CLIENT_UPGRADE, /* Conn is on active list, probing for upgrade */
372 RXRPC_CONN_CLIENT_CULLED, /* Conn is culled and delisted, doing calls */
373 RXRPC_CONN_CLIENT_IDLE, /* Conn is on idle list, doing mostly nothing */
374 RXRPC_CONN__NR_CACHE_STATES
375 };
376
377 /*
378 * The connection protocol state.
379 */
380 enum rxrpc_conn_proto_state {
381 RXRPC_CONN_UNUSED, /* Connection not yet attempted */
382 RXRPC_CONN_CLIENT, /* Client connection */
383 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */
384 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */
385 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
386 RXRPC_CONN_SERVICE, /* Service secured connection */
387 RXRPC_CONN_REMOTELY_ABORTED, /* Conn aborted by peer */
388 RXRPC_CONN_LOCALLY_ABORTED, /* Conn aborted locally */
389 RXRPC_CONN__NR_STATES
390 };
391
392 /*
393 * RxRPC connection definition
394 * - matched by { local, peer, epoch, conn_id, direction }
395 * - each connection can only handle four simultaneous calls
396 */
397 struct rxrpc_connection {
398 struct rxrpc_conn_proto proto;
399 struct rxrpc_conn_parameters params;
400
401 atomic_t usage;
402 struct rcu_head rcu;
403 struct list_head cache_link;
404
405 spinlock_t channel_lock;
406 unsigned char active_chans; /* Mask of active channels */
407 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
408 struct list_head waiting_calls; /* Calls waiting for channels */
409 struct rxrpc_channel {
410 unsigned long final_ack_at; /* Time at which to issue final ACK */
411 struct rxrpc_call __rcu *call; /* Active call */
412 unsigned int call_debug_id; /* call->debug_id */
413 u32 call_id; /* ID of current call */
414 u32 call_counter; /* Call ID counter */
415 u32 last_call; /* ID of last call */
416 u8 last_type; /* Type of last packet */
417 union {
418 u32 last_seq;
419 u32 last_abort;
420 };
421 } channels[RXRPC_MAXCALLS];
422
423 struct timer_list timer; /* Conn event timer */
424 struct work_struct processor; /* connection event processor */
425 union {
426 struct rb_node client_node; /* Node in local->client_conns */
427 struct rb_node service_node; /* Node in peer->service_conns */
428 };
429 struct list_head proc_link; /* link in procfs list */
430 struct list_head link; /* link in master connection list */
431 struct sk_buff_head rx_queue; /* received conn-level packets */
432 const struct rxrpc_security *security; /* applied security module */
433 struct key *server_key; /* security for this service */
434 struct crypto_sync_skcipher *cipher; /* encryption handle */
435 struct rxrpc_crypt csum_iv; /* packet checksum base */
436 unsigned long flags;
437 unsigned long events;
438 unsigned long idle_timestamp; /* Time at which last became idle */
439 spinlock_t state_lock; /* state-change lock */
440 enum rxrpc_conn_cache_state cache_state;
441 enum rxrpc_conn_proto_state state; /* current state of connection */
442 u32 abort_code; /* Abort code of connection abort */
443 int debug_id; /* debug ID for printks */
444 atomic_t serial; /* packet serial number counter */
445 unsigned int hi_serial; /* highest serial number received */
446 u32 security_nonce; /* response re-use preventer */
447 u32 service_id; /* Service ID, possibly upgraded */
448 u8 size_align; /* data size alignment (for security) */
449 u8 security_size; /* security header size */
450 u8 security_ix; /* security type */
451 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
452 short error; /* Local error code */
453 };
454
455 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
456 {
457 return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
458 }
459
460 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
461 {
462 return !rxrpc_to_server(sp);
463 }
464
465 /*
466 * Flags in call->flags.
467 */
468 enum rxrpc_call_flag {
469 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */
470 RXRPC_CALL_HAS_USERID, /* has a user ID attached */
471 RXRPC_CALL_IS_SERVICE, /* Call is service call */
472 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */
473 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */
474 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */
475 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */
476 RXRPC_CALL_PINGING, /* Ping in process */
477 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */
478 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */
479 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */
480 RXRPC_CALL_RX_UNDERRUN, /* Got data underrun */
481 RXRPC_CALL_IS_INTR, /* The call is interruptible */
482 };
483
484 /*
485 * Events that can be raised on a call.
486 */
487 enum rxrpc_call_event {
488 RXRPC_CALL_EV_ACK, /* need to generate ACK */
489 RXRPC_CALL_EV_ABORT, /* need to generate abort */
490 RXRPC_CALL_EV_RESEND, /* Tx resend required */
491 RXRPC_CALL_EV_PING, /* Ping send required */
492 RXRPC_CALL_EV_EXPIRED, /* Expiry occurred */
493 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */
494 };
495
496 /*
497 * The states that a call can be in.
498 */
499 enum rxrpc_call_state {
500 RXRPC_CALL_UNINITIALISED,
501 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */
502 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
503 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */
504 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */
505 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */
506 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */
507 RXRPC_CALL_SERVER_ACCEPTING, /* - server accepting request */
508 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
509 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */
510 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */
511 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */
512 RXRPC_CALL_COMPLETE, /* - call complete */
513 NR__RXRPC_CALL_STATES
514 };
515
516 /*
517 * Call completion condition (state == RXRPC_CALL_COMPLETE).
518 */
519 enum rxrpc_call_completion {
520 RXRPC_CALL_SUCCEEDED, /* - Normal termination */
521 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */
522 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */
523 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */
524 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */
525 NR__RXRPC_CALL_COMPLETIONS
526 };
527
528 /*
529 * Call Tx congestion management modes.
530 */
531 enum rxrpc_congest_mode {
532 RXRPC_CALL_SLOW_START,
533 RXRPC_CALL_CONGEST_AVOIDANCE,
534 RXRPC_CALL_PACKET_LOSS,
535 RXRPC_CALL_FAST_RETRANSMIT,
536 NR__RXRPC_CONGEST_MODES
537 };
538
539 /*
540 * RxRPC call definition
541 * - matched by { connection, call_id }
542 */
543 struct rxrpc_call {
544 struct rcu_head rcu;
545 struct rxrpc_connection *conn; /* connection carrying call */
546 struct rxrpc_peer *peer; /* Peer record for remote address */
547 struct rxrpc_sock __rcu *socket; /* socket responsible */
548 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */
549 struct mutex user_mutex; /* User access mutex */
550 unsigned long ack_at; /* When deferred ACK needs to happen */
551 unsigned long ack_lost_at; /* When ACK is figured as lost */
552 unsigned long resend_at; /* When next resend needs to happen */
553 unsigned long ping_at; /* When next to send a ping */
554 unsigned long keepalive_at; /* When next to send a keepalive ping */
555 unsigned long expect_rx_by; /* When we expect to get a packet by */
556 unsigned long expect_req_by; /* When we expect to get a request DATA packet by */
557 unsigned long expect_term_by; /* When we expect call termination by */
558 u32 next_rx_timo; /* Timeout for next Rx packet (jif) */
559 u32 next_req_timo; /* Timeout for next Rx request packet (jif) */
560 struct timer_list timer; /* Combined event timer */
561 struct work_struct processor; /* Event processor */
562 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */
563 struct list_head link; /* link in master call list */
564 struct list_head chan_wait_link; /* Link in conn->waiting_calls */
565 struct hlist_node error_link; /* link in error distribution list */
566 struct list_head accept_link; /* Link in rx->acceptq */
567 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */
568 struct list_head sock_link; /* Link in rx->sock_calls */
569 struct rb_node sock_node; /* Node in rx->calls */
570 struct sk_buff *tx_pending; /* Tx socket buffer being filled */
571 wait_queue_head_t waitq; /* Wait queue for channel or Tx */
572 s64 tx_total_len; /* Total length left to be transmitted (or -1) */
573 __be32 crypto_buf[2]; /* Temporary packet crypto buffer */
574 unsigned long user_call_ID; /* user-defined call ID */
575 unsigned long flags;
576 unsigned long events;
577 spinlock_t lock;
578 spinlock_t notify_lock; /* Kernel notification lock */
579 rwlock_t state_lock; /* lock for state transition */
580 u32 abort_code; /* Local/remote abort code */
581 int error; /* Local error incurred */
582 enum rxrpc_call_state state; /* current state of call */
583 enum rxrpc_call_completion completion; /* Call completion condition */
584 atomic_t usage;
585 u16 service_id; /* service ID */
586 u8 security_ix; /* Security type */
587 u32 call_id; /* call ID on connection */
588 u32 cid; /* connection ID plus channel index */
589 int debug_id; /* debug ID for printks */
590 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */
591 unsigned short rx_pkt_len; /* Current recvmsg packet len */
592
593 /* Rx/Tx circular buffer, depending on phase.
594 *
595 * In the Rx phase, packets are annotated with 0 or the number of the
596 * segment of a jumbo packet each buffer refers to. There can be up to
597 * 47 segments in a maximum-size UDP packet.
598 *
599 * In the Tx phase, packets are annotated with which buffers have been
600 * acked.
601 */
602 #define RXRPC_RXTX_BUFF_SIZE 64
603 #define RXRPC_RXTX_BUFF_MASK (RXRPC_RXTX_BUFF_SIZE - 1)
604 #define RXRPC_INIT_RX_WINDOW_SIZE 63
605 struct sk_buff **rxtx_buffer;
606 u8 *rxtx_annotations;
607 #define RXRPC_TX_ANNO_ACK 0
608 #define RXRPC_TX_ANNO_UNACK 1
609 #define RXRPC_TX_ANNO_NAK 2
610 #define RXRPC_TX_ANNO_RETRANS 3
611 #define RXRPC_TX_ANNO_MASK 0x03
612 #define RXRPC_TX_ANNO_LAST 0x04
613 #define RXRPC_TX_ANNO_RESENT 0x08
614
615 #define RXRPC_RX_ANNO_JUMBO 0x3f /* Jumbo subpacket number + 1 if not zero */
616 #define RXRPC_RX_ANNO_JLAST 0x40 /* Set if last element of a jumbo packet */
617 #define RXRPC_RX_ANNO_VERIFIED 0x80 /* Set if verified and decrypted */
618 rxrpc_seq_t tx_hard_ack; /* Dead slot in buffer; the first transmitted but
619 * not hard-ACK'd packet follows this.
620 */
621 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */
622 u16 tx_backoff; /* Delay to insert due to Tx failure */
623
624 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS
625 * is fixed, we keep these numbers in terms of segments (ie. DATA
626 * packets) rather than bytes.
627 */
628 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN
629 u8 cong_cwnd; /* Congestion window size */
630 u8 cong_extra; /* Extra to send for congestion management */
631 u8 cong_ssthresh; /* Slow-start threshold */
632 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */
633 u8 cong_dup_acks; /* Count of ACKs showing missing packets */
634 u8 cong_cumul_acks; /* Cumulative ACK count */
635 ktime_t cong_tstamp; /* Last time cwnd was changed */
636
637 rxrpc_seq_t rx_hard_ack; /* Dead slot in buffer; the first received but not
638 * consumed packet follows this.
639 */
640 rxrpc_seq_t rx_top; /* Highest Rx slot allocated. */
641 rxrpc_seq_t rx_expect_next; /* Expected next packet sequence number */
642 rxrpc_serial_t rx_serial; /* Highest serial received for this call */
643 u8 rx_winsize; /* Size of Rx window */
644 u8 tx_winsize; /* Maximum size of Tx window */
645 bool tx_phase; /* T if transmission phase, F if receive phase */
646 u8 nr_jumbo_bad; /* Number of jumbo dups/exceeds-windows */
647
648 spinlock_t input_lock; /* Lock for packet input to this call */
649
650 /* receive-phase ACK management */
651 u8 ackr_reason; /* reason to ACK */
652 u16 ackr_skew; /* skew on packet being ACK'd */
653 rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */
654 rxrpc_serial_t ackr_first_seq; /* first sequence number received */
655 rxrpc_seq_t ackr_prev_seq; /* previous sequence number received */
656 rxrpc_seq_t ackr_consumed; /* Highest packet shown consumed */
657 rxrpc_seq_t ackr_seen; /* Highest packet shown seen */
658
659 /* ping management */
660 rxrpc_serial_t ping_serial; /* Last ping sent */
661 ktime_t ping_time; /* Time last ping sent */
662
663 /* transmission-phase ACK management */
664 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */
665 rxrpc_serial_t acks_latest; /* serial number of latest ACK received */
666 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
667 rxrpc_seq_t acks_lost_top; /* tx_top at the time lost-ack ping sent */
668 rxrpc_serial_t acks_lost_ping; /* Serial number of probe ACK */
669 };
670
671 /*
672 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
673 */
674 struct rxrpc_ack_summary {
675 u8 ack_reason;
676 u8 nr_acks; /* Number of ACKs in packet */
677 u8 nr_nacks; /* Number of NACKs in packet */
678 u8 nr_new_acks; /* Number of new ACKs in packet */
679 u8 nr_new_nacks; /* Number of new NACKs in packet */
680 u8 nr_rot_new_acks; /* Number of rotated new ACKs */
681 bool new_low_nack; /* T if new low NACK found */
682 bool retrans_timeo; /* T if reTx due to timeout happened */
683 u8 flight_size; /* Number of unreceived transmissions */
684 /* Place to stash values for tracing */
685 enum rxrpc_congest_mode mode:8;
686 u8 cwnd;
687 u8 ssthresh;
688 u8 dup_acks;
689 u8 cumulative_acks;
690 };
691
692 /*
693 * sendmsg() cmsg-specified parameters.
694 */
695 enum rxrpc_command {
696 RXRPC_CMD_SEND_DATA, /* send data message */
697 RXRPC_CMD_SEND_ABORT, /* request abort generation */
698 RXRPC_CMD_ACCEPT, /* [server] accept incoming call */
699 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
700 };
701
702 struct rxrpc_call_params {
703 s64 tx_total_len; /* Total Tx data length (if send data) */
704 unsigned long user_call_ID; /* User's call ID */
705 struct {
706 u32 hard; /* Maximum lifetime (sec) */
707 u32 idle; /* Max time since last data packet (msec) */
708 u32 normal; /* Max time since last call packet (msec) */
709 } timeouts;
710 u8 nr_timeouts; /* Number of timeouts specified */
711 bool intr; /* The call is interruptible */
712 };
713
714 struct rxrpc_send_params {
715 struct rxrpc_call_params call;
716 u32 abort_code; /* Abort code to Tx (if abort) */
717 enum rxrpc_command command : 8; /* The command to implement */
718 bool exclusive; /* Shared or exclusive call */
719 bool upgrade; /* If the connection is upgradeable */
720 };
721
722 #include <trace/events/rxrpc.h>
723
724 /*
725 * af_rxrpc.c
726 */
727 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
728 extern struct workqueue_struct *rxrpc_workqueue;
729
730 /*
731 * call_accept.c
732 */
733 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
734 void rxrpc_discard_prealloc(struct rxrpc_sock *);
735 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
736 struct rxrpc_sock *,
737 struct sk_buff *);
738 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
739 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
740 rxrpc_notify_rx_t);
741 int rxrpc_reject_call(struct rxrpc_sock *);
742
743 /*
744 * call_event.c
745 */
746 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
747 enum rxrpc_propose_ack_trace);
748 void rxrpc_process_call(struct work_struct *);
749
750 static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
751 unsigned long expire_at,
752 unsigned long now,
753 enum rxrpc_timer_trace why)
754 {
755 trace_rxrpc_timer(call, why, now);
756 timer_reduce(&call->timer, expire_at);
757 }
758
759 /*
760 * call_object.c
761 */
762 extern const char *const rxrpc_call_states[];
763 extern const char *const rxrpc_call_completions[];
764 extern unsigned int rxrpc_max_call_lifetime;
765 extern struct kmem_cache *rxrpc_call_jar;
766
767 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
768 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
769 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
770 struct rxrpc_conn_parameters *,
771 struct sockaddr_rxrpc *,
772 struct rxrpc_call_params *, gfp_t,
773 unsigned int);
774 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
775 struct sk_buff *);
776 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
777 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
778 bool __rxrpc_queue_call(struct rxrpc_call *);
779 bool rxrpc_queue_call(struct rxrpc_call *);
780 void rxrpc_see_call(struct rxrpc_call *);
781 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
782 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
783 void rxrpc_cleanup_call(struct rxrpc_call *);
784 void rxrpc_destroy_all_calls(struct rxrpc_net *);
785
786 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
787 {
788 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
789 }
790
791 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
792 {
793 return !rxrpc_is_service_call(call);
794 }
795
796 /*
797 * Transition a call to the complete state.
798 */
799 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
800 enum rxrpc_call_completion compl,
801 u32 abort_code,
802 int error)
803 {
804 if (call->state < RXRPC_CALL_COMPLETE) {
805 call->abort_code = abort_code;
806 call->error = error;
807 call->completion = compl,
808 call->state = RXRPC_CALL_COMPLETE;
809 trace_rxrpc_call_complete(call);
810 wake_up(&call->waitq);
811 return true;
812 }
813 return false;
814 }
815
816 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
817 enum rxrpc_call_completion compl,
818 u32 abort_code,
819 int error)
820 {
821 bool ret;
822
823 write_lock_bh(&call->state_lock);
824 ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
825 write_unlock_bh(&call->state_lock);
826 return ret;
827 }
828
829 /*
830 * Record that a call successfully completed.
831 */
832 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
833 {
834 return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
835 }
836
837 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
838 {
839 bool ret;
840
841 write_lock_bh(&call->state_lock);
842 ret = __rxrpc_call_completed(call);
843 write_unlock_bh(&call->state_lock);
844 return ret;
845 }
846
847 /*
848 * Record that a call is locally aborted.
849 */
850 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
851 rxrpc_seq_t seq,
852 u32 abort_code, int error)
853 {
854 trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
855 abort_code, error);
856 return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
857 abort_code, error);
858 }
859
860 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
861 rxrpc_seq_t seq, u32 abort_code, int error)
862 {
863 bool ret;
864
865 write_lock_bh(&call->state_lock);
866 ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
867 write_unlock_bh(&call->state_lock);
868 return ret;
869 }
870
871 /*
872 * Abort a call due to a protocol error.
873 */
874 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
875 struct sk_buff *skb,
876 const char *eproto_why,
877 const char *why,
878 u32 abort_code)
879 {
880 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
881
882 trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
883 return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
884 }
885
886 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
887 __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
888 (abort_why), (abort_code))
889
890 /*
891 * conn_client.c
892 */
893 extern unsigned int rxrpc_max_client_connections;
894 extern unsigned int rxrpc_reap_client_connections;
895 extern unsigned long rxrpc_conn_idle_client_expiry;
896 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
897 extern struct idr rxrpc_client_conn_ids;
898
899 void rxrpc_destroy_client_conn_ids(void);
900 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_call *,
901 struct rxrpc_conn_parameters *, struct sockaddr_rxrpc *,
902 gfp_t);
903 void rxrpc_expose_client_call(struct rxrpc_call *);
904 void rxrpc_disconnect_client_call(struct rxrpc_call *);
905 void rxrpc_put_client_conn(struct rxrpc_connection *);
906 void rxrpc_discard_expired_client_conns(struct work_struct *);
907 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
908
909 /*
910 * conn_event.c
911 */
912 void rxrpc_process_connection(struct work_struct *);
913
914 /*
915 * conn_object.c
916 */
917 extern unsigned int rxrpc_connection_expiry;
918 extern unsigned int rxrpc_closed_conn_expiry;
919
920 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
921 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
922 struct sk_buff *,
923 struct rxrpc_peer **);
924 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
925 void rxrpc_disconnect_call(struct rxrpc_call *);
926 void rxrpc_kill_connection(struct rxrpc_connection *);
927 bool rxrpc_queue_conn(struct rxrpc_connection *);
928 void rxrpc_see_connection(struct rxrpc_connection *);
929 void rxrpc_get_connection(struct rxrpc_connection *);
930 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
931 void rxrpc_put_service_conn(struct rxrpc_connection *);
932 void rxrpc_service_connection_reaper(struct work_struct *);
933 void rxrpc_destroy_all_connections(struct rxrpc_net *);
934
935 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
936 {
937 return conn->out_clientflag;
938 }
939
940 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
941 {
942 return !rxrpc_conn_is_client(conn);
943 }
944
945 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
946 {
947 if (!conn)
948 return;
949
950 if (rxrpc_conn_is_client(conn))
951 rxrpc_put_client_conn(conn);
952 else
953 rxrpc_put_service_conn(conn);
954 }
955
956 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
957 unsigned long expire_at)
958 {
959 timer_reduce(&conn->timer, expire_at);
960 }
961
962 /*
963 * conn_service.c
964 */
965 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
966 struct sk_buff *);
967 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
968 void rxrpc_new_incoming_connection(struct rxrpc_sock *,
969 struct rxrpc_connection *, struct sk_buff *);
970 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
971
972 /*
973 * input.c
974 */
975 int rxrpc_input_packet(struct sock *, struct sk_buff *);
976
977 /*
978 * insecure.c
979 */
980 extern const struct rxrpc_security rxrpc_no_security;
981
982 /*
983 * key.c
984 */
985 extern struct key_type key_type_rxrpc;
986 extern struct key_type key_type_rxrpc_s;
987
988 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
989 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
990 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
991 u32);
992
993 /*
994 * local_event.c
995 */
996 extern void rxrpc_process_local_events(struct rxrpc_local *);
997
998 /*
999 * local_object.c
1000 */
1001 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1002 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
1003 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
1004 void rxrpc_put_local(struct rxrpc_local *);
1005 void rxrpc_queue_local(struct rxrpc_local *);
1006 void rxrpc_destroy_all_locals(struct rxrpc_net *);
1007
1008 /*
1009 * misc.c
1010 */
1011 extern unsigned int rxrpc_max_backlog __read_mostly;
1012 extern unsigned long rxrpc_requested_ack_delay;
1013 extern unsigned long rxrpc_soft_ack_delay;
1014 extern unsigned long rxrpc_idle_ack_delay;
1015 extern unsigned int rxrpc_rx_window_size;
1016 extern unsigned int rxrpc_rx_mtu;
1017 extern unsigned int rxrpc_rx_jumbo_max;
1018 extern unsigned long rxrpc_resend_timeout;
1019
1020 extern const s8 rxrpc_ack_priority[];
1021
1022 /*
1023 * net_ns.c
1024 */
1025 extern unsigned int rxrpc_net_id;
1026 extern struct pernet_operations rxrpc_net_ops;
1027
1028 static inline struct rxrpc_net *rxrpc_net(struct net *net)
1029 {
1030 return net_generic(net, rxrpc_net_id);
1031 }
1032
1033 /*
1034 * output.c
1035 */
1036 int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
1037 int rxrpc_send_abort_packet(struct rxrpc_call *);
1038 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
1039 void rxrpc_reject_packets(struct rxrpc_local *);
1040 void rxrpc_send_keepalive(struct rxrpc_peer *);
1041
1042 /*
1043 * peer_event.c
1044 */
1045 void rxrpc_error_report(struct sock *);
1046 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
1047 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1048 void rxrpc_peer_keepalive_worker(struct work_struct *);
1049
1050 /*
1051 * peer_object.c
1052 */
1053 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1054 const struct sockaddr_rxrpc *);
1055 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *, struct rxrpc_local *,
1056 struct sockaddr_rxrpc *, gfp_t);
1057 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
1058 void rxrpc_new_incoming_peer(struct rxrpc_sock *, struct rxrpc_local *,
1059 struct rxrpc_peer *);
1060 void rxrpc_destroy_all_peers(struct rxrpc_net *);
1061 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
1062 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
1063 void rxrpc_put_peer(struct rxrpc_peer *);
1064
1065 /*
1066 * proc.c
1067 */
1068 extern const struct seq_operations rxrpc_call_seq_ops;
1069 extern const struct seq_operations rxrpc_connection_seq_ops;
1070 extern const struct seq_operations rxrpc_peer_seq_ops;
1071
1072 /*
1073 * recvmsg.c
1074 */
1075 void rxrpc_notify_socket(struct rxrpc_call *);
1076 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1077
1078 /*
1079 * rxkad.c
1080 */
1081 #ifdef CONFIG_RXKAD
1082 extern const struct rxrpc_security rxkad;
1083 #endif
1084
1085 /*
1086 * security.c
1087 */
1088 int __init rxrpc_init_security(void);
1089 void rxrpc_exit_security(void);
1090 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1091 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1092
1093 /*
1094 * sendmsg.c
1095 */
1096 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1097
1098 /*
1099 * skbuff.c
1100 */
1101 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1102 void rxrpc_packet_destructor(struct sk_buff *);
1103 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1104 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1105 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1106 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1107 void rxrpc_purge_queue(struct sk_buff_head *);
1108
1109 /*
1110 * sysctl.c
1111 */
1112 #ifdef CONFIG_SYSCTL
1113 extern int __init rxrpc_sysctl_init(void);
1114 extern void rxrpc_sysctl_exit(void);
1115 #else
1116 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1117 static inline void rxrpc_sysctl_exit(void) {}
1118 #endif
1119
1120 /*
1121 * utils.c
1122 */
1123 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1124
1125 static inline bool before(u32 seq1, u32 seq2)
1126 {
1127 return (s32)(seq1 - seq2) < 0;
1128 }
1129 static inline bool before_eq(u32 seq1, u32 seq2)
1130 {
1131 return (s32)(seq1 - seq2) <= 0;
1132 }
1133 static inline bool after(u32 seq1, u32 seq2)
1134 {
1135 return (s32)(seq1 - seq2) > 0;
1136 }
1137 static inline bool after_eq(u32 seq1, u32 seq2)
1138 {
1139 return (s32)(seq1 - seq2) >= 0;
1140 }
1141
1142 /*
1143 * debug tracing
1144 */
1145 extern unsigned int rxrpc_debug;
1146
1147 #define dbgprintk(FMT,...) \
1148 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1149
1150 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1151 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1152 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1153 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1154 #define knet(FMT,...) dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1155
1156
1157 #if defined(__KDEBUG)
1158 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1159 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1160 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1161 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1162 #define _net(FMT,...) knet(FMT,##__VA_ARGS__)
1163
1164 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1165 #define RXRPC_DEBUG_KENTER 0x01
1166 #define RXRPC_DEBUG_KLEAVE 0x02
1167 #define RXRPC_DEBUG_KDEBUG 0x04
1168 #define RXRPC_DEBUG_KPROTO 0x08
1169 #define RXRPC_DEBUG_KNET 0x10
1170
1171 #define _enter(FMT,...) \
1172 do { \
1173 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1174 kenter(FMT,##__VA_ARGS__); \
1175 } while (0)
1176
1177 #define _leave(FMT,...) \
1178 do { \
1179 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1180 kleave(FMT,##__VA_ARGS__); \
1181 } while (0)
1182
1183 #define _debug(FMT,...) \
1184 do { \
1185 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1186 kdebug(FMT,##__VA_ARGS__); \
1187 } while (0)
1188
1189 #define _proto(FMT,...) \
1190 do { \
1191 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1192 kproto(FMT,##__VA_ARGS__); \
1193 } while (0)
1194
1195 #define _net(FMT,...) \
1196 do { \
1197 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET)) \
1198 knet(FMT,##__VA_ARGS__); \
1199 } while (0)
1200
1201 #else
1202 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1203 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1204 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1205 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1206 #define _net(FMT,...) no_printk("@@@ "FMT ,##__VA_ARGS__)
1207 #endif
1208
1209 /*
1210 * debug assertion checking
1211 */
1212 #if 1 // defined(__KDEBUGALL)
1213
1214 #define ASSERT(X) \
1215 do { \
1216 if (unlikely(!(X))) { \
1217 pr_err("Assertion failed\n"); \
1218 BUG(); \
1219 } \
1220 } while (0)
1221
1222 #define ASSERTCMP(X, OP, Y) \
1223 do { \
1224 __typeof__(X) _x = (X); \
1225 __typeof__(Y) _y = (__typeof__(X))(Y); \
1226 if (unlikely(!(_x OP _y))) { \
1227 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1228 (unsigned long)_x, (unsigned long)_x, #OP, \
1229 (unsigned long)_y, (unsigned long)_y); \
1230 BUG(); \
1231 } \
1232 } while (0)
1233
1234 #define ASSERTIF(C, X) \
1235 do { \
1236 if (unlikely((C) && !(X))) { \
1237 pr_err("Assertion failed\n"); \
1238 BUG(); \
1239 } \
1240 } while (0)
1241
1242 #define ASSERTIFCMP(C, X, OP, Y) \
1243 do { \
1244 __typeof__(X) _x = (X); \
1245 __typeof__(Y) _y = (__typeof__(X))(Y); \
1246 if (unlikely((C) && !(_x OP _y))) { \
1247 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1248 (unsigned long)_x, (unsigned long)_x, #OP, \
1249 (unsigned long)_y, (unsigned long)_y); \
1250 BUG(); \
1251 } \
1252 } while (0)
1253
1254 #else
1255
1256 #define ASSERT(X) \
1257 do { \
1258 } while (0)
1259
1260 #define ASSERTCMP(X, OP, Y) \
1261 do { \
1262 } while (0)
1263
1264 #define ASSERTIF(C, X) \
1265 do { \
1266 } while (0)
1267
1268 #define ASSERTIFCMP(C, X, OP, Y) \
1269 do { \
1270 } while (0)
1271
1272 #endif /* __KDEBUGALL */
Mirror of linux-2.6-arm at arm.linux.org.uk