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Merge tag 'hsi-for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-hsi
[mirror_ubuntu-eoan-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/net_namespace.h>
15 #include <net/netns/generic.h>
16 #include <net/sock.h>
17 #include <net/af_rxrpc.h>
18 #include "protocol.h"
19
20 #if 0
21 #define CHECK_SLAB_OKAY(X) \
22 BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
23 (POISON_FREE << 8 | POISON_FREE))
24 #else
25 #define CHECK_SLAB_OKAY(X) do {} while (0)
26 #endif
27
28 #define FCRYPT_BSIZE 8
29 struct rxrpc_crypt {
30 union {
31 u8 x[FCRYPT_BSIZE];
32 __be32 n[2];
33 };
34 } __attribute__((aligned(8)));
35
36 #define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS))
37 #define rxrpc_queue_delayed_work(WS,D) \
38 queue_delayed_work(rxrpc_workqueue, (WS), (D))
39
40 struct rxrpc_connection;
41
42 /*
43 * Mark applied to socket buffers in skb->mark. skb->priority is used
44 * to pass supplementary information.
45 */
46 enum rxrpc_skb_mark {
47 RXRPC_SKB_MARK_REJECT_BUSY, /* Reject with BUSY */
48 RXRPC_SKB_MARK_REJECT_ABORT, /* Reject with ABORT (code in skb->priority) */
49 };
50
51 /*
52 * sk_state for RxRPC sockets
53 */
54 enum {
55 RXRPC_UNBOUND = 0,
56 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */
57 RXRPC_CLIENT_BOUND, /* client local address bound */
58 RXRPC_SERVER_BOUND, /* server local address bound */
59 RXRPC_SERVER_BOUND2, /* second server local address bound */
60 RXRPC_SERVER_LISTENING, /* server listening for connections */
61 RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */
62 RXRPC_CLOSE, /* socket is being closed */
63 };
64
65 /*
66 * Per-network namespace data.
67 */
68 struct rxrpc_net {
69 struct proc_dir_entry *proc_net; /* Subdir in /proc/net */
70 u32 epoch; /* Local epoch for detecting local-end reset */
71 struct list_head calls; /* List of calls active in this namespace */
72 rwlock_t call_lock; /* Lock for ->calls */
73 atomic_t nr_calls; /* Count of allocated calls */
74
75 atomic_t nr_conns;
76 struct list_head conn_proc_list; /* List of conns in this namespace for proc */
77 struct list_head service_conns; /* Service conns in this namespace */
78 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */
79 struct work_struct service_conn_reaper;
80 struct timer_list service_conn_reap_timer;
81
82 unsigned int nr_client_conns;
83 unsigned int nr_active_client_conns;
84 bool kill_all_client_conns;
85 bool live;
86 spinlock_t client_conn_cache_lock; /* Lock for ->*_client_conns */
87 spinlock_t client_conn_discard_lock; /* Prevent multiple discarders */
88 struct list_head waiting_client_conns;
89 struct list_head active_client_conns;
90 struct list_head idle_client_conns;
91 struct work_struct client_conn_reaper;
92 struct timer_list client_conn_reap_timer;
93
94 struct list_head local_endpoints;
95 struct mutex local_mutex; /* Lock for ->local_endpoints */
96
97 DECLARE_HASHTABLE (peer_hash, 10);
98 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */
99
100 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
101 u8 peer_keepalive_cursor;
102 time64_t peer_keepalive_base;
103 struct list_head peer_keepalive[32];
104 struct list_head peer_keepalive_new;
105 struct timer_list peer_keepalive_timer;
106 struct work_struct peer_keepalive_work;
107 };
108
109 /*
110 * Service backlog preallocation.
111 *
112 * This contains circular buffers of preallocated peers, connections and calls
113 * for incoming service calls and their head and tail pointers. This allows
114 * calls to be set up in the data_ready handler, thereby avoiding the need to
115 * shuffle packets around so much.
116 */
117 struct rxrpc_backlog {
118 unsigned short peer_backlog_head;
119 unsigned short peer_backlog_tail;
120 unsigned short conn_backlog_head;
121 unsigned short conn_backlog_tail;
122 unsigned short call_backlog_head;
123 unsigned short call_backlog_tail;
124 #define RXRPC_BACKLOG_MAX 32
125 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX];
126 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
127 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX];
128 };
129
130 /*
131 * RxRPC socket definition
132 */
133 struct rxrpc_sock {
134 /* WARNING: sk has to be the first member */
135 struct sock sk;
136 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
137 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
138 struct rxrpc_local *local; /* local endpoint */
139 struct rxrpc_backlog *backlog; /* Preallocation for services */
140 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */
141 struct list_head sock_calls; /* List of calls owned by this socket */
142 struct list_head to_be_accepted; /* calls awaiting acceptance */
143 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */
144 rwlock_t recvmsg_lock; /* Lock for recvmsg_q */
145 struct key *key; /* security for this socket */
146 struct key *securities; /* list of server security descriptors */
147 struct rb_root calls; /* User ID -> call mapping */
148 unsigned long flags;
149 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */
150 rwlock_t call_lock; /* lock for calls */
151 u32 min_sec_level; /* minimum security level */
152 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT
153 bool exclusive; /* Exclusive connection for a client socket */
154 u16 second_service; /* Additional service bound to the endpoint */
155 struct {
156 /* Service upgrade information */
157 u16 from; /* Service ID to upgrade (if not 0) */
158 u16 to; /* service ID to upgrade to */
159 } service_upgrade;
160 sa_family_t family; /* Protocol family created with */
161 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */
162 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */
163 };
164
165 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
166
167 /*
168 * CPU-byteorder normalised Rx packet header.
169 */
170 struct rxrpc_host_header {
171 u32 epoch; /* client boot timestamp */
172 u32 cid; /* connection and channel ID */
173 u32 callNumber; /* call ID (0 for connection-level packets) */
174 u32 seq; /* sequence number of pkt in call stream */
175 u32 serial; /* serial number of pkt sent to network */
176 u8 type; /* packet type */
177 u8 flags; /* packet flags */
178 u8 userStatus; /* app-layer defined status */
179 u8 securityIndex; /* security protocol ID */
180 union {
181 u16 _rsvd; /* reserved */
182 u16 cksum; /* kerberos security checksum */
183 };
184 u16 serviceId; /* service ID */
185 } __packed;
186
187 /*
188 * RxRPC socket buffer private variables
189 * - max 48 bytes (struct sk_buff::cb)
190 */
191 struct rxrpc_skb_priv {
192 union {
193 u8 nr_jumbo; /* Number of jumbo subpackets */
194 };
195 union {
196 int remain; /* amount of space remaining for next write */
197 };
198
199 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */
200 };
201
202 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
203
204 /*
205 * RxRPC security module interface
206 */
207 struct rxrpc_security {
208 const char *name; /* name of this service */
209 u8 security_index; /* security type provided */
210
211 /* Initialise a security service */
212 int (*init)(void);
213
214 /* Clean up a security service */
215 void (*exit)(void);
216
217 /* initialise a connection's security */
218 int (*init_connection_security)(struct rxrpc_connection *);
219
220 /* prime a connection's packet security */
221 int (*prime_packet_security)(struct rxrpc_connection *);
222
223 /* impose security on a packet */
224 int (*secure_packet)(struct rxrpc_call *,
225 struct sk_buff *,
226 size_t,
227 void *);
228
229 /* verify the security on a received packet */
230 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
231 unsigned int, unsigned int, rxrpc_seq_t, u16);
232
233 /* Locate the data in a received packet that has been verified. */
234 void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
235 unsigned int *, unsigned int *);
236
237 /* issue a challenge */
238 int (*issue_challenge)(struct rxrpc_connection *);
239
240 /* respond to a challenge */
241 int (*respond_to_challenge)(struct rxrpc_connection *,
242 struct sk_buff *,
243 u32 *);
244
245 /* verify a response */
246 int (*verify_response)(struct rxrpc_connection *,
247 struct sk_buff *,
248 u32 *);
249
250 /* clear connection security */
251 void (*clear)(struct rxrpc_connection *);
252 };
253
254 /*
255 * RxRPC local transport endpoint description
256 * - owned by a single AF_RXRPC socket
257 * - pointed to by transport socket struct sk_user_data
258 */
259 struct rxrpc_local {
260 struct rcu_head rcu;
261 atomic_t usage;
262 struct rxrpc_net *rxnet; /* The network ns in which this resides */
263 struct list_head link;
264 struct socket *socket; /* my UDP socket */
265 struct work_struct processor;
266 struct rxrpc_sock __rcu *service; /* Service(s) listening on this endpoint */
267 struct rw_semaphore defrag_sem; /* control re-enablement of IP DF bit */
268 struct sk_buff_head reject_queue; /* packets awaiting rejection */
269 struct sk_buff_head event_queue; /* endpoint event packets awaiting processing */
270 struct rb_root client_conns; /* Client connections by socket params */
271 spinlock_t client_conns_lock; /* Lock for client_conns */
272 spinlock_t lock; /* access lock */
273 rwlock_t services_lock; /* lock for services list */
274 int debug_id; /* debug ID for printks */
275 bool dead;
276 bool service_closed; /* Service socket closed */
277 struct sockaddr_rxrpc srx; /* local address */
278 };
279
280 /*
281 * RxRPC remote transport endpoint definition
282 * - matched by local endpoint, remote port, address and protocol type
283 */
284 struct rxrpc_peer {
285 struct rcu_head rcu; /* This must be first */
286 atomic_t usage;
287 unsigned long hash_key;
288 struct hlist_node hash_link;
289 struct rxrpc_local *local;
290 struct hlist_head error_targets; /* targets for net error distribution */
291 struct rb_root service_conns; /* Service connections */
292 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */
293 time64_t last_tx_at; /* Last time packet sent here */
294 seqlock_t service_conn_lock;
295 spinlock_t lock; /* access lock */
296 unsigned int if_mtu; /* interface MTU for this peer */
297 unsigned int mtu; /* network MTU for this peer */
298 unsigned int maxdata; /* data size (MTU - hdrsize) */
299 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */
300 int debug_id; /* debug ID for printks */
301 struct sockaddr_rxrpc srx; /* remote address */
302
303 /* calculated RTT cache */
304 #define RXRPC_RTT_CACHE_SIZE 32
305 spinlock_t rtt_input_lock; /* RTT lock for input routine */
306 ktime_t rtt_last_req; /* Time of last RTT request */
307 u64 rtt; /* Current RTT estimate (in nS) */
308 u64 rtt_sum; /* Sum of cache contents */
309 u64 rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
310 u8 rtt_cursor; /* next entry at which to insert */
311 u8 rtt_usage; /* amount of cache actually used */
312
313 u8 cong_cwnd; /* Congestion window size */
314 };
315
316 /*
317 * Keys for matching a connection.
318 */
319 struct rxrpc_conn_proto {
320 union {
321 struct {
322 u32 epoch; /* epoch of this connection */
323 u32 cid; /* connection ID */
324 };
325 u64 index_key;
326 };
327 };
328
329 struct rxrpc_conn_parameters {
330 struct rxrpc_local *local; /* Representation of local endpoint */
331 struct rxrpc_peer *peer; /* Remote endpoint */
332 struct key *key; /* Security details */
333 bool exclusive; /* T if conn is exclusive */
334 bool upgrade; /* T if service ID can be upgraded */
335 u16 service_id; /* Service ID for this connection */
336 u32 security_level; /* Security level selected */
337 };
338
339 /*
340 * Bits in the connection flags.
341 */
342 enum rxrpc_conn_flag {
343 RXRPC_CONN_HAS_IDR, /* Has a client conn ID assigned */
344 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */
345 RXRPC_CONN_IN_CLIENT_CONNS, /* Conn is in local->client_conns */
346 RXRPC_CONN_EXPOSED, /* Conn has extra ref for exposure */
347 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */
348 RXRPC_CONN_COUNTED, /* Counted by rxrpc_nr_client_conns */
349 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
350 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */
351 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */
352 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */
353 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */
354 };
355
356 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \
357 (1UL << RXRPC_CONN_FINAL_ACK_1) | \
358 (1UL << RXRPC_CONN_FINAL_ACK_2) | \
359 (1UL << RXRPC_CONN_FINAL_ACK_3))
360
361 /*
362 * Events that can be raised upon a connection.
363 */
364 enum rxrpc_conn_event {
365 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */
366 };
367
368 /*
369 * The connection cache state.
370 */
371 enum rxrpc_conn_cache_state {
372 RXRPC_CONN_CLIENT_INACTIVE, /* Conn is not yet listed */
373 RXRPC_CONN_CLIENT_WAITING, /* Conn is on wait list, waiting for capacity */
374 RXRPC_CONN_CLIENT_ACTIVE, /* Conn is on active list, doing calls */
375 RXRPC_CONN_CLIENT_UPGRADE, /* Conn is on active list, probing for upgrade */
376 RXRPC_CONN_CLIENT_CULLED, /* Conn is culled and delisted, doing calls */
377 RXRPC_CONN_CLIENT_IDLE, /* Conn is on idle list, doing mostly nothing */
378 RXRPC_CONN__NR_CACHE_STATES
379 };
380
381 /*
382 * The connection protocol state.
383 */
384 enum rxrpc_conn_proto_state {
385 RXRPC_CONN_UNUSED, /* Connection not yet attempted */
386 RXRPC_CONN_CLIENT, /* Client connection */
387 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */
388 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */
389 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
390 RXRPC_CONN_SERVICE, /* Service secured connection */
391 RXRPC_CONN_REMOTELY_ABORTED, /* Conn aborted by peer */
392 RXRPC_CONN_LOCALLY_ABORTED, /* Conn aborted locally */
393 RXRPC_CONN__NR_STATES
394 };
395
396 /*
397 * RxRPC connection definition
398 * - matched by { local, peer, epoch, conn_id, direction }
399 * - each connection can only handle four simultaneous calls
400 */
401 struct rxrpc_connection {
402 struct rxrpc_conn_proto proto;
403 struct rxrpc_conn_parameters params;
404
405 atomic_t usage;
406 struct rcu_head rcu;
407 struct list_head cache_link;
408
409 spinlock_t channel_lock;
410 unsigned char active_chans; /* Mask of active channels */
411 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
412 struct list_head waiting_calls; /* Calls waiting for channels */
413 struct rxrpc_channel {
414 unsigned long final_ack_at; /* Time at which to issue final ACK */
415 struct rxrpc_call __rcu *call; /* Active call */
416 unsigned int call_debug_id; /* call->debug_id */
417 u32 call_id; /* ID of current call */
418 u32 call_counter; /* Call ID counter */
419 u32 last_call; /* ID of last call */
420 u8 last_type; /* Type of last packet */
421 union {
422 u32 last_seq;
423 u32 last_abort;
424 };
425 } channels[RXRPC_MAXCALLS];
426
427 struct timer_list timer; /* Conn event timer */
428 struct work_struct processor; /* connection event processor */
429 union {
430 struct rb_node client_node; /* Node in local->client_conns */
431 struct rb_node service_node; /* Node in peer->service_conns */
432 };
433 struct list_head proc_link; /* link in procfs list */
434 struct list_head link; /* link in master connection list */
435 struct sk_buff_head rx_queue; /* received conn-level packets */
436 const struct rxrpc_security *security; /* applied security module */
437 struct key *server_key; /* security for this service */
438 struct crypto_sync_skcipher *cipher; /* encryption handle */
439 struct rxrpc_crypt csum_iv; /* packet checksum base */
440 unsigned long flags;
441 unsigned long events;
442 unsigned long idle_timestamp; /* Time at which last became idle */
443 spinlock_t state_lock; /* state-change lock */
444 enum rxrpc_conn_cache_state cache_state;
445 enum rxrpc_conn_proto_state state; /* current state of connection */
446 u32 abort_code; /* Abort code of connection abort */
447 int debug_id; /* debug ID for printks */
448 atomic_t serial; /* packet serial number counter */
449 unsigned int hi_serial; /* highest serial number received */
450 u32 security_nonce; /* response re-use preventer */
451 u32 service_id; /* Service ID, possibly upgraded */
452 u8 size_align; /* data size alignment (for security) */
453 u8 security_size; /* security header size */
454 u8 security_ix; /* security type */
455 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
456 short error; /* Local error code */
457 };
458
459 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
460 {
461 return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
462 }
463
464 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
465 {
466 return !rxrpc_to_server(sp);
467 }
468
469 /*
470 * Flags in call->flags.
471 */
472 enum rxrpc_call_flag {
473 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */
474 RXRPC_CALL_HAS_USERID, /* has a user ID attached */
475 RXRPC_CALL_IS_SERVICE, /* Call is service call */
476 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */
477 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */
478 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */
479 RXRPC_CALL_TX_LASTQ, /* Last packet has been queued */
480 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */
481 RXRPC_CALL_PINGING, /* Ping in process */
482 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */
483 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */
484 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */
485 RXRPC_CALL_RX_UNDERRUN, /* Got data underrun */
486 };
487
488 /*
489 * Events that can be raised on a call.
490 */
491 enum rxrpc_call_event {
492 RXRPC_CALL_EV_ACK, /* need to generate ACK */
493 RXRPC_CALL_EV_ABORT, /* need to generate abort */
494 RXRPC_CALL_EV_RESEND, /* Tx resend required */
495 RXRPC_CALL_EV_PING, /* Ping send required */
496 RXRPC_CALL_EV_EXPIRED, /* Expiry occurred */
497 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */
498 };
499
500 /*
501 * The states that a call can be in.
502 */
503 enum rxrpc_call_state {
504 RXRPC_CALL_UNINITIALISED,
505 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */
506 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
507 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */
508 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */
509 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */
510 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */
511 RXRPC_CALL_SERVER_ACCEPTING, /* - server accepting request */
512 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
513 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */
514 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */
515 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */
516 RXRPC_CALL_COMPLETE, /* - call complete */
517 NR__RXRPC_CALL_STATES
518 };
519
520 /*
521 * Call Tx congestion management modes.
522 */
523 enum rxrpc_congest_mode {
524 RXRPC_CALL_SLOW_START,
525 RXRPC_CALL_CONGEST_AVOIDANCE,
526 RXRPC_CALL_PACKET_LOSS,
527 RXRPC_CALL_FAST_RETRANSMIT,
528 NR__RXRPC_CONGEST_MODES
529 };
530
531 /*
532 * RxRPC call definition
533 * - matched by { connection, call_id }
534 */
535 struct rxrpc_call {
536 struct rcu_head rcu;
537 struct rxrpc_connection *conn; /* connection carrying call */
538 struct rxrpc_peer *peer; /* Peer record for remote address */
539 struct rxrpc_sock __rcu *socket; /* socket responsible */
540 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */
541 struct mutex user_mutex; /* User access mutex */
542 unsigned long ack_at; /* When deferred ACK needs to happen */
543 unsigned long ack_lost_at; /* When ACK is figured as lost */
544 unsigned long resend_at; /* When next resend needs to happen */
545 unsigned long ping_at; /* When next to send a ping */
546 unsigned long keepalive_at; /* When next to send a keepalive ping */
547 unsigned long expect_rx_by; /* When we expect to get a packet by */
548 unsigned long expect_req_by; /* When we expect to get a request DATA packet by */
549 unsigned long expect_term_by; /* When we expect call termination by */
550 u32 next_rx_timo; /* Timeout for next Rx packet (jif) */
551 u32 next_req_timo; /* Timeout for next Rx request packet (jif) */
552 struct timer_list timer; /* Combined event timer */
553 struct work_struct processor; /* Event processor */
554 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */
555 struct list_head link; /* link in master call list */
556 struct list_head chan_wait_link; /* Link in conn->waiting_calls */
557 struct hlist_node error_link; /* link in error distribution list */
558 struct list_head accept_link; /* Link in rx->acceptq */
559 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */
560 struct list_head sock_link; /* Link in rx->sock_calls */
561 struct rb_node sock_node; /* Node in rx->calls */
562 struct sk_buff *tx_pending; /* Tx socket buffer being filled */
563 wait_queue_head_t waitq; /* Wait queue for channel or Tx */
564 s64 tx_total_len; /* Total length left to be transmitted (or -1) */
565 __be32 crypto_buf[2]; /* Temporary packet crypto buffer */
566 unsigned long user_call_ID; /* user-defined call ID */
567 unsigned long flags;
568 unsigned long events;
569 spinlock_t lock;
570 spinlock_t notify_lock; /* Kernel notification lock */
571 rwlock_t state_lock; /* lock for state transition */
572 u32 abort_code; /* Local/remote abort code */
573 int error; /* Local error incurred */
574 enum rxrpc_call_state state; /* current state of call */
575 enum rxrpc_call_completion completion; /* Call completion condition */
576 atomic_t usage;
577 u16 service_id; /* service ID */
578 u8 security_ix; /* Security type */
579 u32 call_id; /* call ID on connection */
580 u32 cid; /* connection ID plus channel index */
581 int debug_id; /* debug ID for printks */
582 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */
583 unsigned short rx_pkt_len; /* Current recvmsg packet len */
584
585 /* Rx/Tx circular buffer, depending on phase.
586 *
587 * In the Rx phase, packets are annotated with 0 or the number of the
588 * segment of a jumbo packet each buffer refers to. There can be up to
589 * 47 segments in a maximum-size UDP packet.
590 *
591 * In the Tx phase, packets are annotated with which buffers have been
592 * acked.
593 */
594 #define RXRPC_RXTX_BUFF_SIZE 64
595 #define RXRPC_RXTX_BUFF_MASK (RXRPC_RXTX_BUFF_SIZE - 1)
596 #define RXRPC_INIT_RX_WINDOW_SIZE 63
597 struct sk_buff **rxtx_buffer;
598 u8 *rxtx_annotations;
599 #define RXRPC_TX_ANNO_ACK 0
600 #define RXRPC_TX_ANNO_UNACK 1
601 #define RXRPC_TX_ANNO_NAK 2
602 #define RXRPC_TX_ANNO_RETRANS 3
603 #define RXRPC_TX_ANNO_MASK 0x03
604 #define RXRPC_TX_ANNO_LAST 0x04
605 #define RXRPC_TX_ANNO_RESENT 0x08
606
607 #define RXRPC_RX_ANNO_JUMBO 0x3f /* Jumbo subpacket number + 1 if not zero */
608 #define RXRPC_RX_ANNO_JLAST 0x40 /* Set if last element of a jumbo packet */
609 #define RXRPC_RX_ANNO_VERIFIED 0x80 /* Set if verified and decrypted */
610 rxrpc_seq_t tx_hard_ack; /* Dead slot in buffer; the first transmitted but
611 * not hard-ACK'd packet follows this.
612 */
613 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */
614 u16 tx_backoff; /* Delay to insert due to Tx failure */
615
616 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS
617 * is fixed, we keep these numbers in terms of segments (ie. DATA
618 * packets) rather than bytes.
619 */
620 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN
621 u8 cong_cwnd; /* Congestion window size */
622 u8 cong_extra; /* Extra to send for congestion management */
623 u8 cong_ssthresh; /* Slow-start threshold */
624 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */
625 u8 cong_dup_acks; /* Count of ACKs showing missing packets */
626 u8 cong_cumul_acks; /* Cumulative ACK count */
627 ktime_t cong_tstamp; /* Last time cwnd was changed */
628
629 rxrpc_seq_t rx_hard_ack; /* Dead slot in buffer; the first received but not
630 * consumed packet follows this.
631 */
632 rxrpc_seq_t rx_top; /* Highest Rx slot allocated. */
633 rxrpc_seq_t rx_expect_next; /* Expected next packet sequence number */
634 rxrpc_serial_t rx_serial; /* Highest serial received for this call */
635 u8 rx_winsize; /* Size of Rx window */
636 u8 tx_winsize; /* Maximum size of Tx window */
637 bool tx_phase; /* T if transmission phase, F if receive phase */
638 u8 nr_jumbo_bad; /* Number of jumbo dups/exceeds-windows */
639
640 spinlock_t input_lock; /* Lock for packet input to this call */
641
642 /* receive-phase ACK management */
643 u8 ackr_reason; /* reason to ACK */
644 u16 ackr_skew; /* skew on packet being ACK'd */
645 rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */
646 rxrpc_seq_t ackr_prev_seq; /* previous sequence number received */
647 rxrpc_seq_t ackr_consumed; /* Highest packet shown consumed */
648 rxrpc_seq_t ackr_seen; /* Highest packet shown seen */
649
650 /* ping management */
651 rxrpc_serial_t ping_serial; /* Last ping sent */
652 ktime_t ping_time; /* Time last ping sent */
653
654 /* transmission-phase ACK management */
655 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */
656 rxrpc_serial_t acks_latest; /* serial number of latest ACK received */
657 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
658 rxrpc_seq_t acks_lost_top; /* tx_top at the time lost-ack ping sent */
659 rxrpc_serial_t acks_lost_ping; /* Serial number of probe ACK */
660 };
661
662 /*
663 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
664 */
665 struct rxrpc_ack_summary {
666 u8 ack_reason;
667 u8 nr_acks; /* Number of ACKs in packet */
668 u8 nr_nacks; /* Number of NACKs in packet */
669 u8 nr_new_acks; /* Number of new ACKs in packet */
670 u8 nr_new_nacks; /* Number of new NACKs in packet */
671 u8 nr_rot_new_acks; /* Number of rotated new ACKs */
672 bool new_low_nack; /* T if new low NACK found */
673 bool retrans_timeo; /* T if reTx due to timeout happened */
674 u8 flight_size; /* Number of unreceived transmissions */
675 /* Place to stash values for tracing */
676 enum rxrpc_congest_mode mode:8;
677 u8 cwnd;
678 u8 ssthresh;
679 u8 dup_acks;
680 u8 cumulative_acks;
681 };
682
683 /*
684 * sendmsg() cmsg-specified parameters.
685 */
686 enum rxrpc_command {
687 RXRPC_CMD_SEND_DATA, /* send data message */
688 RXRPC_CMD_SEND_ABORT, /* request abort generation */
689 RXRPC_CMD_ACCEPT, /* [server] accept incoming call */
690 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
691 };
692
693 struct rxrpc_call_params {
694 s64 tx_total_len; /* Total Tx data length (if send data) */
695 unsigned long user_call_ID; /* User's call ID */
696 struct {
697 u32 hard; /* Maximum lifetime (sec) */
698 u32 idle; /* Max time since last data packet (msec) */
699 u32 normal; /* Max time since last call packet (msec) */
700 } timeouts;
701 u8 nr_timeouts; /* Number of timeouts specified */
702 };
703
704 struct rxrpc_send_params {
705 struct rxrpc_call_params call;
706 u32 abort_code; /* Abort code to Tx (if abort) */
707 enum rxrpc_command command : 8; /* The command to implement */
708 bool exclusive; /* Shared or exclusive call */
709 bool upgrade; /* If the connection is upgradeable */
710 };
711
712 #include <trace/events/rxrpc.h>
713
714 /*
715 * af_rxrpc.c
716 */
717 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
718 extern struct workqueue_struct *rxrpc_workqueue;
719
720 /*
721 * call_accept.c
722 */
723 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
724 void rxrpc_discard_prealloc(struct rxrpc_sock *);
725 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
726 struct rxrpc_sock *,
727 struct sk_buff *);
728 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
729 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
730 rxrpc_notify_rx_t);
731 int rxrpc_reject_call(struct rxrpc_sock *);
732
733 /*
734 * call_event.c
735 */
736 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
737 enum rxrpc_propose_ack_trace);
738 void rxrpc_process_call(struct work_struct *);
739
740 static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
741 unsigned long expire_at,
742 unsigned long now,
743 enum rxrpc_timer_trace why)
744 {
745 trace_rxrpc_timer(call, why, now);
746 timer_reduce(&call->timer, expire_at);
747 }
748
749 /*
750 * call_object.c
751 */
752 extern const char *const rxrpc_call_states[];
753 extern const char *const rxrpc_call_completions[];
754 extern unsigned int rxrpc_max_call_lifetime;
755 extern struct kmem_cache *rxrpc_call_jar;
756
757 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
758 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
759 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
760 struct rxrpc_conn_parameters *,
761 struct sockaddr_rxrpc *,
762 struct rxrpc_call_params *, gfp_t,
763 unsigned int);
764 int rxrpc_retry_client_call(struct rxrpc_sock *,
765 struct rxrpc_call *,
766 struct rxrpc_conn_parameters *,
767 struct sockaddr_rxrpc *,
768 gfp_t);
769 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
770 struct sk_buff *);
771 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
772 int rxrpc_prepare_call_for_retry(struct rxrpc_sock *, struct rxrpc_call *);
773 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
774 bool __rxrpc_queue_call(struct rxrpc_call *);
775 bool rxrpc_queue_call(struct rxrpc_call *);
776 void rxrpc_see_call(struct rxrpc_call *);
777 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
778 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
779 void rxrpc_cleanup_call(struct rxrpc_call *);
780 void rxrpc_destroy_all_calls(struct rxrpc_net *);
781
782 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
783 {
784 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
785 }
786
787 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
788 {
789 return !rxrpc_is_service_call(call);
790 }
791
792 /*
793 * Transition a call to the complete state.
794 */
795 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
796 enum rxrpc_call_completion compl,
797 u32 abort_code,
798 int error)
799 {
800 if (call->state < RXRPC_CALL_COMPLETE) {
801 call->abort_code = abort_code;
802 call->error = error;
803 call->completion = compl,
804 call->state = RXRPC_CALL_COMPLETE;
805 trace_rxrpc_call_complete(call);
806 wake_up(&call->waitq);
807 return true;
808 }
809 return false;
810 }
811
812 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
813 enum rxrpc_call_completion compl,
814 u32 abort_code,
815 int error)
816 {
817 bool ret;
818
819 write_lock_bh(&call->state_lock);
820 ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
821 write_unlock_bh(&call->state_lock);
822 return ret;
823 }
824
825 /*
826 * Record that a call successfully completed.
827 */
828 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
829 {
830 return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
831 }
832
833 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
834 {
835 bool ret;
836
837 write_lock_bh(&call->state_lock);
838 ret = __rxrpc_call_completed(call);
839 write_unlock_bh(&call->state_lock);
840 return ret;
841 }
842
843 /*
844 * Record that a call is locally aborted.
845 */
846 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
847 rxrpc_seq_t seq,
848 u32 abort_code, int error)
849 {
850 trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
851 abort_code, error);
852 return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
853 abort_code, error);
854 }
855
856 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
857 rxrpc_seq_t seq, u32 abort_code, int error)
858 {
859 bool ret;
860
861 write_lock_bh(&call->state_lock);
862 ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
863 write_unlock_bh(&call->state_lock);
864 return ret;
865 }
866
867 /*
868 * Abort a call due to a protocol error.
869 */
870 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
871 struct sk_buff *skb,
872 const char *eproto_why,
873 const char *why,
874 u32 abort_code)
875 {
876 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
877
878 trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
879 return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
880 }
881
882 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
883 __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
884 (abort_why), (abort_code))
885
886 /*
887 * conn_client.c
888 */
889 extern unsigned int rxrpc_max_client_connections;
890 extern unsigned int rxrpc_reap_client_connections;
891 extern unsigned long rxrpc_conn_idle_client_expiry;
892 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
893 extern struct idr rxrpc_client_conn_ids;
894
895 void rxrpc_destroy_client_conn_ids(void);
896 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_call *,
897 struct rxrpc_conn_parameters *, struct sockaddr_rxrpc *,
898 gfp_t);
899 void rxrpc_expose_client_call(struct rxrpc_call *);
900 void rxrpc_disconnect_client_call(struct rxrpc_call *);
901 void rxrpc_put_client_conn(struct rxrpc_connection *);
902 void rxrpc_discard_expired_client_conns(struct work_struct *);
903 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
904
905 /*
906 * conn_event.c
907 */
908 void rxrpc_process_connection(struct work_struct *);
909
910 /*
911 * conn_object.c
912 */
913 extern unsigned int rxrpc_connection_expiry;
914 extern unsigned int rxrpc_closed_conn_expiry;
915
916 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
917 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
918 struct sk_buff *,
919 struct rxrpc_peer **);
920 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
921 void rxrpc_disconnect_call(struct rxrpc_call *);
922 void rxrpc_kill_connection(struct rxrpc_connection *);
923 bool rxrpc_queue_conn(struct rxrpc_connection *);
924 void rxrpc_see_connection(struct rxrpc_connection *);
925 void rxrpc_get_connection(struct rxrpc_connection *);
926 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
927 void rxrpc_put_service_conn(struct rxrpc_connection *);
928 void rxrpc_service_connection_reaper(struct work_struct *);
929 void rxrpc_destroy_all_connections(struct rxrpc_net *);
930
931 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
932 {
933 return conn->out_clientflag;
934 }
935
936 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
937 {
938 return !rxrpc_conn_is_client(conn);
939 }
940
941 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
942 {
943 if (!conn)
944 return;
945
946 if (rxrpc_conn_is_client(conn))
947 rxrpc_put_client_conn(conn);
948 else
949 rxrpc_put_service_conn(conn);
950 }
951
952 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
953 unsigned long expire_at)
954 {
955 timer_reduce(&conn->timer, expire_at);
956 }
957
958 /*
959 * conn_service.c
960 */
961 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
962 struct sk_buff *);
963 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
964 void rxrpc_new_incoming_connection(struct rxrpc_sock *,
965 struct rxrpc_connection *, struct sk_buff *);
966 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
967
968 /*
969 * input.c
970 */
971 int rxrpc_input_packet(struct sock *, struct sk_buff *);
972
973 /*
974 * insecure.c
975 */
976 extern const struct rxrpc_security rxrpc_no_security;
977
978 /*
979 * key.c
980 */
981 extern struct key_type key_type_rxrpc;
982 extern struct key_type key_type_rxrpc_s;
983
984 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
985 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
986 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
987 u32);
988
989 /*
990 * local_event.c
991 */
992 extern void rxrpc_process_local_events(struct rxrpc_local *);
993
994 /*
995 * local_object.c
996 */
997 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
998 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
999 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
1000 void rxrpc_put_local(struct rxrpc_local *);
1001 void rxrpc_queue_local(struct rxrpc_local *);
1002 void rxrpc_destroy_all_locals(struct rxrpc_net *);
1003
1004 /*
1005 * misc.c
1006 */
1007 extern unsigned int rxrpc_max_backlog __read_mostly;
1008 extern unsigned long rxrpc_requested_ack_delay;
1009 extern unsigned long rxrpc_soft_ack_delay;
1010 extern unsigned long rxrpc_idle_ack_delay;
1011 extern unsigned int rxrpc_rx_window_size;
1012 extern unsigned int rxrpc_rx_mtu;
1013 extern unsigned int rxrpc_rx_jumbo_max;
1014 extern unsigned long rxrpc_resend_timeout;
1015
1016 extern const s8 rxrpc_ack_priority[];
1017
1018 /*
1019 * net_ns.c
1020 */
1021 extern unsigned int rxrpc_net_id;
1022 extern struct pernet_operations rxrpc_net_ops;
1023
1024 static inline struct rxrpc_net *rxrpc_net(struct net *net)
1025 {
1026 return net_generic(net, rxrpc_net_id);
1027 }
1028
1029 /*
1030 * output.c
1031 */
1032 int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
1033 int rxrpc_send_abort_packet(struct rxrpc_call *);
1034 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
1035 void rxrpc_reject_packets(struct rxrpc_local *);
1036 void rxrpc_send_keepalive(struct rxrpc_peer *);
1037
1038 /*
1039 * peer_event.c
1040 */
1041 void rxrpc_error_report(struct sock *);
1042 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
1043 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1044 void rxrpc_peer_keepalive_worker(struct work_struct *);
1045
1046 /*
1047 * peer_object.c
1048 */
1049 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1050 const struct sockaddr_rxrpc *);
1051 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *, struct rxrpc_local *,
1052 struct sockaddr_rxrpc *, gfp_t);
1053 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
1054 void rxrpc_new_incoming_peer(struct rxrpc_sock *, struct rxrpc_local *,
1055 struct rxrpc_peer *);
1056 void rxrpc_destroy_all_peers(struct rxrpc_net *);
1057 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
1058 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
1059 void rxrpc_put_peer(struct rxrpc_peer *);
1060
1061 /*
1062 * proc.c
1063 */
1064 extern const struct seq_operations rxrpc_call_seq_ops;
1065 extern const struct seq_operations rxrpc_connection_seq_ops;
1066 extern const struct seq_operations rxrpc_peer_seq_ops;
1067
1068 /*
1069 * recvmsg.c
1070 */
1071 void rxrpc_notify_socket(struct rxrpc_call *);
1072 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1073
1074 /*
1075 * rxkad.c
1076 */
1077 #ifdef CONFIG_RXKAD
1078 extern const struct rxrpc_security rxkad;
1079 #endif
1080
1081 /*
1082 * security.c
1083 */
1084 int __init rxrpc_init_security(void);
1085 void rxrpc_exit_security(void);
1086 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1087 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1088
1089 /*
1090 * sendmsg.c
1091 */
1092 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1093
1094 /*
1095 * skbuff.c
1096 */
1097 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1098 void rxrpc_packet_destructor(struct sk_buff *);
1099 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1100 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1101 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1102 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1103 void rxrpc_purge_queue(struct sk_buff_head *);
1104
1105 /*
1106 * sysctl.c
1107 */
1108 #ifdef CONFIG_SYSCTL
1109 extern int __init rxrpc_sysctl_init(void);
1110 extern void rxrpc_sysctl_exit(void);
1111 #else
1112 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1113 static inline void rxrpc_sysctl_exit(void) {}
1114 #endif
1115
1116 /*
1117 * utils.c
1118 */
1119 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1120
1121 static inline bool before(u32 seq1, u32 seq2)
1122 {
1123 return (s32)(seq1 - seq2) < 0;
1124 }
1125 static inline bool before_eq(u32 seq1, u32 seq2)
1126 {
1127 return (s32)(seq1 - seq2) <= 0;
1128 }
1129 static inline bool after(u32 seq1, u32 seq2)
1130 {
1131 return (s32)(seq1 - seq2) > 0;
1132 }
1133 static inline bool after_eq(u32 seq1, u32 seq2)
1134 {
1135 return (s32)(seq1 - seq2) >= 0;
1136 }
1137
1138 /*
1139 * debug tracing
1140 */
1141 extern unsigned int rxrpc_debug;
1142
1143 #define dbgprintk(FMT,...) \
1144 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1145
1146 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1147 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1148 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1149 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1150 #define knet(FMT,...) dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1151
1152
1153 #if defined(__KDEBUG)
1154 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1155 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1156 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1157 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1158 #define _net(FMT,...) knet(FMT,##__VA_ARGS__)
1159
1160 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1161 #define RXRPC_DEBUG_KENTER 0x01
1162 #define RXRPC_DEBUG_KLEAVE 0x02
1163 #define RXRPC_DEBUG_KDEBUG 0x04
1164 #define RXRPC_DEBUG_KPROTO 0x08
1165 #define RXRPC_DEBUG_KNET 0x10
1166
1167 #define _enter(FMT,...) \
1168 do { \
1169 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1170 kenter(FMT,##__VA_ARGS__); \
1171 } while (0)
1172
1173 #define _leave(FMT,...) \
1174 do { \
1175 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1176 kleave(FMT,##__VA_ARGS__); \
1177 } while (0)
1178
1179 #define _debug(FMT,...) \
1180 do { \
1181 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1182 kdebug(FMT,##__VA_ARGS__); \
1183 } while (0)
1184
1185 #define _proto(FMT,...) \
1186 do { \
1187 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1188 kproto(FMT,##__VA_ARGS__); \
1189 } while (0)
1190
1191 #define _net(FMT,...) \
1192 do { \
1193 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET)) \
1194 knet(FMT,##__VA_ARGS__); \
1195 } while (0)
1196
1197 #else
1198 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1199 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1200 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1201 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1202 #define _net(FMT,...) no_printk("@@@ "FMT ,##__VA_ARGS__)
1203 #endif
1204
1205 /*
1206 * debug assertion checking
1207 */
1208 #if 1 // defined(__KDEBUGALL)
1209
1210 #define ASSERT(X) \
1211 do { \
1212 if (unlikely(!(X))) { \
1213 pr_err("Assertion failed\n"); \
1214 BUG(); \
1215 } \
1216 } while (0)
1217
1218 #define ASSERTCMP(X, OP, Y) \
1219 do { \
1220 __typeof__(X) _x = (X); \
1221 __typeof__(Y) _y = (__typeof__(X))(Y); \
1222 if (unlikely(!(_x OP _y))) { \
1223 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1224 (unsigned long)_x, (unsigned long)_x, #OP, \
1225 (unsigned long)_y, (unsigned long)_y); \
1226 BUG(); \
1227 } \
1228 } while (0)
1229
1230 #define ASSERTIF(C, X) \
1231 do { \
1232 if (unlikely((C) && !(X))) { \
1233 pr_err("Assertion failed\n"); \
1234 BUG(); \
1235 } \
1236 } while (0)
1237
1238 #define ASSERTIFCMP(C, X, OP, Y) \
1239 do { \
1240 __typeof__(X) _x = (X); \
1241 __typeof__(Y) _y = (__typeof__(X))(Y); \
1242 if (unlikely((C) && !(_x OP _y))) { \
1243 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1244 (unsigned long)_x, (unsigned long)_x, #OP, \
1245 (unsigned long)_y, (unsigned long)_y); \
1246 BUG(); \
1247 } \
1248 } while (0)
1249
1250 #else
1251
1252 #define ASSERT(X) \
1253 do { \
1254 } while (0)
1255
1256 #define ASSERTCMP(X, OP, Y) \
1257 do { \
1258 } while (0)
1259
1260 #define ASSERTIF(C, X) \
1261 do { \
1262 } while (0)
1263
1264 #define ASSERTIFCMP(C, X, OP, Y) \
1265 do { \
1266 } while (0)
1267
1268 #endif /* __KDEBUGALL */
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