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rxrpc: Fix firewall route keepalive
[thirdparty/kernel/stable.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.
44 */
45 enum rxrpc_skb_mark {
46 RXRPC_SKB_MARK_DATA, /* data message */
47 RXRPC_SKB_MARK_FINAL_ACK, /* final ACK received message */
48 RXRPC_SKB_MARK_BUSY, /* server busy message */
49 RXRPC_SKB_MARK_REMOTE_ABORT, /* remote abort message */
50 RXRPC_SKB_MARK_LOCAL_ABORT, /* local abort message */
51 RXRPC_SKB_MARK_NET_ERROR, /* network error message */
52 RXRPC_SKB_MARK_LOCAL_ERROR, /* local error message */
53 RXRPC_SKB_MARK_NEW_CALL, /* local error message */
54 };
55
56 /*
57 * sk_state for RxRPC sockets
58 */
59 enum {
60 RXRPC_UNBOUND = 0,
61 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */
62 RXRPC_CLIENT_BOUND, /* client local address bound */
63 RXRPC_SERVER_BOUND, /* server local address bound */
64 RXRPC_SERVER_BOUND2, /* second server local address bound */
65 RXRPC_SERVER_LISTENING, /* server listening for connections */
66 RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */
67 RXRPC_CLOSE, /* socket is being closed */
68 };
69
70 /*
71 * Per-network namespace data.
72 */
73 struct rxrpc_net {
74 struct proc_dir_entry *proc_net; /* Subdir in /proc/net */
75 u32 epoch; /* Local epoch for detecting local-end reset */
76 struct list_head calls; /* List of calls active in this namespace */
77 rwlock_t call_lock; /* Lock for ->calls */
78
79 struct list_head conn_proc_list; /* List of conns in this namespace for proc */
80 struct list_head service_conns; /* Service conns in this namespace */
81 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */
82 struct work_struct service_conn_reaper;
83 struct timer_list service_conn_reap_timer;
84
85 unsigned int nr_client_conns;
86 unsigned int nr_active_client_conns;
87 bool kill_all_client_conns;
88 bool live;
89 spinlock_t client_conn_cache_lock; /* Lock for ->*_client_conns */
90 spinlock_t client_conn_discard_lock; /* Prevent multiple discarders */
91 struct list_head waiting_client_conns;
92 struct list_head active_client_conns;
93 struct list_head idle_client_conns;
94 struct work_struct client_conn_reaper;
95 struct timer_list client_conn_reap_timer;
96
97 struct list_head local_endpoints;
98 struct mutex local_mutex; /* Lock for ->local_endpoints */
99
100 DECLARE_HASHTABLE (peer_hash, 10);
101 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */
102
103 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
104 u8 peer_keepalive_cursor;
105 ktime_t peer_keepalive_base;
106 struct hlist_head peer_keepalive[RXRPC_KEEPALIVE_TIME + 1];
107 struct hlist_head peer_keepalive_new;
108 struct timer_list peer_keepalive_timer;
109 struct work_struct peer_keepalive_work;
110 };
111
112 /*
113 * Service backlog preallocation.
114 *
115 * This contains circular buffers of preallocated peers, connections and calls
116 * for incoming service calls and their head and tail pointers. This allows
117 * calls to be set up in the data_ready handler, thereby avoiding the need to
118 * shuffle packets around so much.
119 */
120 struct rxrpc_backlog {
121 unsigned short peer_backlog_head;
122 unsigned short peer_backlog_tail;
123 unsigned short conn_backlog_head;
124 unsigned short conn_backlog_tail;
125 unsigned short call_backlog_head;
126 unsigned short call_backlog_tail;
127 #define RXRPC_BACKLOG_MAX 32
128 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX];
129 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
130 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX];
131 };
132
133 /*
134 * RxRPC socket definition
135 */
136 struct rxrpc_sock {
137 /* WARNING: sk has to be the first member */
138 struct sock sk;
139 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
140 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
141 struct rxrpc_local *local; /* local endpoint */
142 struct rxrpc_backlog *backlog; /* Preallocation for services */
143 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */
144 struct list_head sock_calls; /* List of calls owned by this socket */
145 struct list_head to_be_accepted; /* calls awaiting acceptance */
146 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */
147 rwlock_t recvmsg_lock; /* Lock for recvmsg_q */
148 struct key *key; /* security for this socket */
149 struct key *securities; /* list of server security descriptors */
150 struct rb_root calls; /* User ID -> call mapping */
151 unsigned long flags;
152 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */
153 rwlock_t call_lock; /* lock for calls */
154 u32 min_sec_level; /* minimum security level */
155 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT
156 bool exclusive; /* Exclusive connection for a client socket */
157 u16 second_service; /* Additional service bound to the endpoint */
158 struct {
159 /* Service upgrade information */
160 u16 from; /* Service ID to upgrade (if not 0) */
161 u16 to; /* service ID to upgrade to */
162 } service_upgrade;
163 sa_family_t family; /* Protocol family created with */
164 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */
165 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */
166 };
167
168 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
169
170 /*
171 * CPU-byteorder normalised Rx packet header.
172 */
173 struct rxrpc_host_header {
174 u32 epoch; /* client boot timestamp */
175 u32 cid; /* connection and channel ID */
176 u32 callNumber; /* call ID (0 for connection-level packets) */
177 u32 seq; /* sequence number of pkt in call stream */
178 u32 serial; /* serial number of pkt sent to network */
179 u8 type; /* packet type */
180 u8 flags; /* packet flags */
181 u8 userStatus; /* app-layer defined status */
182 u8 securityIndex; /* security protocol ID */
183 union {
184 u16 _rsvd; /* reserved */
185 u16 cksum; /* kerberos security checksum */
186 };
187 u16 serviceId; /* service ID */
188 } __packed;
189
190 /*
191 * RxRPC socket buffer private variables
192 * - max 48 bytes (struct sk_buff::cb)
193 */
194 struct rxrpc_skb_priv {
195 union {
196 u8 nr_jumbo; /* Number of jumbo subpackets */
197 };
198 union {
199 int remain; /* amount of space remaining for next write */
200 };
201
202 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */
203 };
204
205 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
206
207 /*
208 * RxRPC security module interface
209 */
210 struct rxrpc_security {
211 const char *name; /* name of this service */
212 u8 security_index; /* security type provided */
213
214 /* Initialise a security service */
215 int (*init)(void);
216
217 /* Clean up a security service */
218 void (*exit)(void);
219
220 /* initialise a connection's security */
221 int (*init_connection_security)(struct rxrpc_connection *);
222
223 /* prime a connection's packet security */
224 int (*prime_packet_security)(struct rxrpc_connection *);
225
226 /* impose security on a packet */
227 int (*secure_packet)(struct rxrpc_call *,
228 struct sk_buff *,
229 size_t,
230 void *);
231
232 /* verify the security on a received packet */
233 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
234 unsigned int, unsigned int, rxrpc_seq_t, u16);
235
236 /* Locate the data in a received packet that has been verified. */
237 void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
238 unsigned int *, unsigned int *);
239
240 /* issue a challenge */
241 int (*issue_challenge)(struct rxrpc_connection *);
242
243 /* respond to a challenge */
244 int (*respond_to_challenge)(struct rxrpc_connection *,
245 struct sk_buff *,
246 u32 *);
247
248 /* verify a response */
249 int (*verify_response)(struct rxrpc_connection *,
250 struct sk_buff *,
251 u32 *);
252
253 /* clear connection security */
254 void (*clear)(struct rxrpc_connection *);
255 };
256
257 /*
258 * RxRPC local transport endpoint description
259 * - owned by a single AF_RXRPC socket
260 * - pointed to by transport socket struct sk_user_data
261 */
262 struct rxrpc_local {
263 struct rcu_head rcu;
264 atomic_t usage;
265 struct rxrpc_net *rxnet; /* The network ns in which this resides */
266 struct list_head link;
267 struct socket *socket; /* my UDP socket */
268 struct work_struct processor;
269 struct rxrpc_sock __rcu *service; /* Service(s) listening on this endpoint */
270 struct rw_semaphore defrag_sem; /* control re-enablement of IP DF bit */
271 struct sk_buff_head reject_queue; /* packets awaiting rejection */
272 struct sk_buff_head event_queue; /* endpoint event packets awaiting processing */
273 struct rb_root client_conns; /* Client connections by socket params */
274 spinlock_t client_conns_lock; /* Lock for client_conns */
275 spinlock_t lock; /* access lock */
276 rwlock_t services_lock; /* lock for services list */
277 int debug_id; /* debug ID for printks */
278 bool dead;
279 bool service_closed; /* Service socket closed */
280 struct sockaddr_rxrpc srx; /* local address */
281 };
282
283 /*
284 * RxRPC remote transport endpoint definition
285 * - matched by local endpoint, remote port, address and protocol type
286 */
287 struct rxrpc_peer {
288 struct rcu_head rcu; /* This must be first */
289 atomic_t usage;
290 unsigned long hash_key;
291 struct hlist_node hash_link;
292 struct rxrpc_local *local;
293 struct hlist_head error_targets; /* targets for net error distribution */
294 struct work_struct error_distributor;
295 struct rb_root service_conns; /* Service connections */
296 struct hlist_node keepalive_link; /* Link in net->peer_keepalive[] */
297 time64_t last_tx_at; /* Last time packet sent here */
298 seqlock_t service_conn_lock;
299 spinlock_t lock; /* access lock */
300 unsigned int if_mtu; /* interface MTU for this peer */
301 unsigned int mtu; /* network MTU for this peer */
302 unsigned int maxdata; /* data size (MTU - hdrsize) */
303 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */
304 int debug_id; /* debug ID for printks */
305 int error_report; /* Net (+0) or local (+1000000) to distribute */
306 #define RXRPC_LOCAL_ERROR_OFFSET 1000000
307 struct sockaddr_rxrpc srx; /* remote address */
308
309 /* calculated RTT cache */
310 #define RXRPC_RTT_CACHE_SIZE 32
311 ktime_t rtt_last_req; /* Time of last RTT request */
312 u64 rtt; /* Current RTT estimate (in nS) */
313 u64 rtt_sum; /* Sum of cache contents */
314 u64 rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* Determined RTT cache */
315 u8 rtt_cursor; /* next entry at which to insert */
316 u8 rtt_usage; /* amount of cache actually used */
317
318 u8 cong_cwnd; /* Congestion window size */
319 };
320
321 /*
322 * Keys for matching a connection.
323 */
324 struct rxrpc_conn_proto {
325 union {
326 struct {
327 u32 epoch; /* epoch of this connection */
328 u32 cid; /* connection ID */
329 };
330 u64 index_key;
331 };
332 };
333
334 struct rxrpc_conn_parameters {
335 struct rxrpc_local *local; /* Representation of local endpoint */
336 struct rxrpc_peer *peer; /* Remote endpoint */
337 struct key *key; /* Security details */
338 bool exclusive; /* T if conn is exclusive */
339 bool upgrade; /* T if service ID can be upgraded */
340 u16 service_id; /* Service ID for this connection */
341 u32 security_level; /* Security level selected */
342 };
343
344 /*
345 * Bits in the connection flags.
346 */
347 enum rxrpc_conn_flag {
348 RXRPC_CONN_HAS_IDR, /* Has a client conn ID assigned */
349 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */
350 RXRPC_CONN_IN_CLIENT_CONNS, /* Conn is in local->client_conns */
351 RXRPC_CONN_EXPOSED, /* Conn has extra ref for exposure */
352 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */
353 RXRPC_CONN_COUNTED, /* Counted by rxrpc_nr_client_conns */
354 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
355 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */
356 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */
357 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */
358 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */
359 };
360
361 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \
362 (1UL << RXRPC_CONN_FINAL_ACK_1) | \
363 (1UL << RXRPC_CONN_FINAL_ACK_2) | \
364 (1UL << RXRPC_CONN_FINAL_ACK_3))
365
366 /*
367 * Events that can be raised upon a connection.
368 */
369 enum rxrpc_conn_event {
370 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */
371 };
372
373 /*
374 * The connection cache state.
375 */
376 enum rxrpc_conn_cache_state {
377 RXRPC_CONN_CLIENT_INACTIVE, /* Conn is not yet listed */
378 RXRPC_CONN_CLIENT_WAITING, /* Conn is on wait list, waiting for capacity */
379 RXRPC_CONN_CLIENT_ACTIVE, /* Conn is on active list, doing calls */
380 RXRPC_CONN_CLIENT_UPGRADE, /* Conn is on active list, probing for upgrade */
381 RXRPC_CONN_CLIENT_CULLED, /* Conn is culled and delisted, doing calls */
382 RXRPC_CONN_CLIENT_IDLE, /* Conn is on idle list, doing mostly nothing */
383 RXRPC_CONN__NR_CACHE_STATES
384 };
385
386 /*
387 * The connection protocol state.
388 */
389 enum rxrpc_conn_proto_state {
390 RXRPC_CONN_UNUSED, /* Connection not yet attempted */
391 RXRPC_CONN_CLIENT, /* Client connection */
392 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */
393 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */
394 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
395 RXRPC_CONN_SERVICE, /* Service secured connection */
396 RXRPC_CONN_REMOTELY_ABORTED, /* Conn aborted by peer */
397 RXRPC_CONN_LOCALLY_ABORTED, /* Conn aborted locally */
398 RXRPC_CONN__NR_STATES
399 };
400
401 /*
402 * RxRPC connection definition
403 * - matched by { local, peer, epoch, conn_id, direction }
404 * - each connection can only handle four simultaneous calls
405 */
406 struct rxrpc_connection {
407 struct rxrpc_conn_proto proto;
408 struct rxrpc_conn_parameters params;
409
410 atomic_t usage;
411 struct rcu_head rcu;
412 struct list_head cache_link;
413
414 spinlock_t channel_lock;
415 unsigned char active_chans; /* Mask of active channels */
416 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
417 struct list_head waiting_calls; /* Calls waiting for channels */
418 struct rxrpc_channel {
419 unsigned long final_ack_at; /* Time at which to issue final ACK */
420 struct rxrpc_call __rcu *call; /* Active call */
421 u32 call_id; /* ID of current call */
422 u32 call_counter; /* Call ID counter */
423 u32 last_call; /* ID of last call */
424 u8 last_type; /* Type of last packet */
425 union {
426 u32 last_seq;
427 u32 last_abort;
428 };
429 } channels[RXRPC_MAXCALLS];
430
431 struct timer_list timer; /* Conn event timer */
432 struct work_struct processor; /* connection event processor */
433 union {
434 struct rb_node client_node; /* Node in local->client_conns */
435 struct rb_node service_node; /* Node in peer->service_conns */
436 };
437 struct list_head proc_link; /* link in procfs list */
438 struct list_head link; /* link in master connection list */
439 struct sk_buff_head rx_queue; /* received conn-level packets */
440 const struct rxrpc_security *security; /* applied security module */
441 struct key *server_key; /* security for this service */
442 struct crypto_skcipher *cipher; /* encryption handle */
443 struct rxrpc_crypt csum_iv; /* packet checksum base */
444 unsigned long flags;
445 unsigned long events;
446 unsigned long idle_timestamp; /* Time at which last became idle */
447 spinlock_t state_lock; /* state-change lock */
448 enum rxrpc_conn_cache_state cache_state;
449 enum rxrpc_conn_proto_state state; /* current state of connection */
450 u32 local_abort; /* local abort code */
451 u32 remote_abort; /* remote abort code */
452 int debug_id; /* debug ID for printks */
453 atomic_t serial; /* packet serial number counter */
454 unsigned int hi_serial; /* highest serial number received */
455 u32 security_nonce; /* response re-use preventer */
456 u16 service_id; /* Service ID, possibly upgraded */
457 u8 size_align; /* data size alignment (for security) */
458 u8 security_size; /* security header size */
459 u8 security_ix; /* security type */
460 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
461 };
462
463 /*
464 * Flags in call->flags.
465 */
466 enum rxrpc_call_flag {
467 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */
468 RXRPC_CALL_HAS_USERID, /* has a user ID attached */
469 RXRPC_CALL_IS_SERVICE, /* Call is service call */
470 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */
471 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */
472 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */
473 RXRPC_CALL_TX_LASTQ, /* Last packet has been queued */
474 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */
475 RXRPC_CALL_PINGING, /* Ping in process */
476 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */
477 };
478
479 /*
480 * Events that can be raised on a call.
481 */
482 enum rxrpc_call_event {
483 RXRPC_CALL_EV_ACK, /* need to generate ACK */
484 RXRPC_CALL_EV_ABORT, /* need to generate abort */
485 RXRPC_CALL_EV_RESEND, /* Tx resend required */
486 RXRPC_CALL_EV_PING, /* Ping send required */
487 RXRPC_CALL_EV_EXPIRED, /* Expiry occurred */
488 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */
489 };
490
491 /*
492 * The states that a call can be in.
493 */
494 enum rxrpc_call_state {
495 RXRPC_CALL_UNINITIALISED,
496 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */
497 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
498 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */
499 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */
500 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */
501 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */
502 RXRPC_CALL_SERVER_ACCEPTING, /* - server accepting request */
503 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
504 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */
505 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */
506 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */
507 RXRPC_CALL_COMPLETE, /* - call complete */
508 NR__RXRPC_CALL_STATES
509 };
510
511 /*
512 * Call Tx congestion management modes.
513 */
514 enum rxrpc_congest_mode {
515 RXRPC_CALL_SLOW_START,
516 RXRPC_CALL_CONGEST_AVOIDANCE,
517 RXRPC_CALL_PACKET_LOSS,
518 RXRPC_CALL_FAST_RETRANSMIT,
519 NR__RXRPC_CONGEST_MODES
520 };
521
522 /*
523 * RxRPC call definition
524 * - matched by { connection, call_id }
525 */
526 struct rxrpc_call {
527 struct rcu_head rcu;
528 struct rxrpc_connection *conn; /* connection carrying call */
529 struct rxrpc_peer *peer; /* Peer record for remote address */
530 struct rxrpc_sock __rcu *socket; /* socket responsible */
531 struct mutex user_mutex; /* User access mutex */
532 unsigned long ack_at; /* When deferred ACK needs to happen */
533 unsigned long ack_lost_at; /* When ACK is figured as lost */
534 unsigned long resend_at; /* When next resend needs to happen */
535 unsigned long ping_at; /* When next to send a ping */
536 unsigned long keepalive_at; /* When next to send a keepalive ping */
537 unsigned long expect_rx_by; /* When we expect to get a packet by */
538 unsigned long expect_req_by; /* When we expect to get a request DATA packet by */
539 unsigned long expect_term_by; /* When we expect call termination by */
540 u32 next_rx_timo; /* Timeout for next Rx packet (jif) */
541 u32 next_req_timo; /* Timeout for next Rx request packet (jif) */
542 struct timer_list timer; /* Combined event timer */
543 struct work_struct processor; /* Event processor */
544 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */
545 struct list_head link; /* link in master call list */
546 struct list_head chan_wait_link; /* Link in conn->waiting_calls */
547 struct hlist_node error_link; /* link in error distribution list */
548 struct list_head accept_link; /* Link in rx->acceptq */
549 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */
550 struct list_head sock_link; /* Link in rx->sock_calls */
551 struct rb_node sock_node; /* Node in rx->calls */
552 struct sk_buff *tx_pending; /* Tx socket buffer being filled */
553 wait_queue_head_t waitq; /* Wait queue for channel or Tx */
554 s64 tx_total_len; /* Total length left to be transmitted (or -1) */
555 __be32 crypto_buf[2]; /* Temporary packet crypto buffer */
556 unsigned long user_call_ID; /* user-defined call ID */
557 unsigned long flags;
558 unsigned long events;
559 spinlock_t lock;
560 spinlock_t notify_lock; /* Kernel notification lock */
561 rwlock_t state_lock; /* lock for state transition */
562 u32 abort_code; /* Local/remote abort code */
563 int error; /* Local error incurred */
564 enum rxrpc_call_state state; /* current state of call */
565 enum rxrpc_call_completion completion; /* Call completion condition */
566 atomic_t usage;
567 u16 service_id; /* service ID */
568 u8 security_ix; /* Security type */
569 u32 call_id; /* call ID on connection */
570 u32 cid; /* connection ID plus channel index */
571 int debug_id; /* debug ID for printks */
572 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */
573 unsigned short rx_pkt_len; /* Current recvmsg packet len */
574
575 /* Rx/Tx circular buffer, depending on phase.
576 *
577 * In the Rx phase, packets are annotated with 0 or the number of the
578 * segment of a jumbo packet each buffer refers to. There can be up to
579 * 47 segments in a maximum-size UDP packet.
580 *
581 * In the Tx phase, packets are annotated with which buffers have been
582 * acked.
583 */
584 #define RXRPC_RXTX_BUFF_SIZE 64
585 #define RXRPC_RXTX_BUFF_MASK (RXRPC_RXTX_BUFF_SIZE - 1)
586 #define RXRPC_INIT_RX_WINDOW_SIZE 32
587 struct sk_buff **rxtx_buffer;
588 u8 *rxtx_annotations;
589 #define RXRPC_TX_ANNO_ACK 0
590 #define RXRPC_TX_ANNO_UNACK 1
591 #define RXRPC_TX_ANNO_NAK 2
592 #define RXRPC_TX_ANNO_RETRANS 3
593 #define RXRPC_TX_ANNO_MASK 0x03
594 #define RXRPC_TX_ANNO_LAST 0x04
595 #define RXRPC_TX_ANNO_RESENT 0x08
596
597 #define RXRPC_RX_ANNO_JUMBO 0x3f /* Jumbo subpacket number + 1 if not zero */
598 #define RXRPC_RX_ANNO_JLAST 0x40 /* Set if last element of a jumbo packet */
599 #define RXRPC_RX_ANNO_VERIFIED 0x80 /* Set if verified and decrypted */
600 rxrpc_seq_t tx_hard_ack; /* Dead slot in buffer; the first transmitted but
601 * not hard-ACK'd packet follows this.
602 */
603 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */
604
605 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS
606 * is fixed, we keep these numbers in terms of segments (ie. DATA
607 * packets) rather than bytes.
608 */
609 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN
610 u8 cong_cwnd; /* Congestion window size */
611 u8 cong_extra; /* Extra to send for congestion management */
612 u8 cong_ssthresh; /* Slow-start threshold */
613 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */
614 u8 cong_dup_acks; /* Count of ACKs showing missing packets */
615 u8 cong_cumul_acks; /* Cumulative ACK count */
616 ktime_t cong_tstamp; /* Last time cwnd was changed */
617
618 rxrpc_seq_t rx_hard_ack; /* Dead slot in buffer; the first received but not
619 * consumed packet follows this.
620 */
621 rxrpc_seq_t rx_top; /* Highest Rx slot allocated. */
622 rxrpc_seq_t rx_expect_next; /* Expected next packet sequence number */
623 u8 rx_winsize; /* Size of Rx window */
624 u8 tx_winsize; /* Maximum size of Tx window */
625 bool tx_phase; /* T if transmission phase, F if receive phase */
626 u8 nr_jumbo_bad; /* Number of jumbo dups/exceeds-windows */
627
628 /* receive-phase ACK management */
629 u8 ackr_reason; /* reason to ACK */
630 u16 ackr_skew; /* skew on packet being ACK'd */
631 rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */
632 rxrpc_seq_t ackr_prev_seq; /* previous sequence number received */
633 rxrpc_seq_t ackr_consumed; /* Highest packet shown consumed */
634 rxrpc_seq_t ackr_seen; /* Highest packet shown seen */
635
636 /* ping management */
637 rxrpc_serial_t ping_serial; /* Last ping sent */
638 ktime_t ping_time; /* Time last ping sent */
639
640 /* transmission-phase ACK management */
641 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */
642 rxrpc_serial_t acks_latest; /* serial number of latest ACK received */
643 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
644 rxrpc_seq_t acks_lost_top; /* tx_top at the time lost-ack ping sent */
645 rxrpc_serial_t acks_lost_ping; /* Serial number of probe ACK */
646 };
647
648 /*
649 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
650 */
651 struct rxrpc_ack_summary {
652 u8 ack_reason;
653 u8 nr_acks; /* Number of ACKs in packet */
654 u8 nr_nacks; /* Number of NACKs in packet */
655 u8 nr_new_acks; /* Number of new ACKs in packet */
656 u8 nr_new_nacks; /* Number of new NACKs in packet */
657 u8 nr_rot_new_acks; /* Number of rotated new ACKs */
658 bool new_low_nack; /* T if new low NACK found */
659 bool retrans_timeo; /* T if reTx due to timeout happened */
660 u8 flight_size; /* Number of unreceived transmissions */
661 /* Place to stash values for tracing */
662 enum rxrpc_congest_mode mode:8;
663 u8 cwnd;
664 u8 ssthresh;
665 u8 dup_acks;
666 u8 cumulative_acks;
667 };
668
669 /*
670 * sendmsg() cmsg-specified parameters.
671 */
672 enum rxrpc_command {
673 RXRPC_CMD_SEND_DATA, /* send data message */
674 RXRPC_CMD_SEND_ABORT, /* request abort generation */
675 RXRPC_CMD_ACCEPT, /* [server] accept incoming call */
676 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
677 };
678
679 struct rxrpc_call_params {
680 s64 tx_total_len; /* Total Tx data length (if send data) */
681 unsigned long user_call_ID; /* User's call ID */
682 struct {
683 u32 hard; /* Maximum lifetime (sec) */
684 u32 idle; /* Max time since last data packet (msec) */
685 u32 normal; /* Max time since last call packet (msec) */
686 } timeouts;
687 u8 nr_timeouts; /* Number of timeouts specified */
688 };
689
690 struct rxrpc_send_params {
691 struct rxrpc_call_params call;
692 u32 abort_code; /* Abort code to Tx (if abort) */
693 enum rxrpc_command command : 8; /* The command to implement */
694 bool exclusive; /* Shared or exclusive call */
695 bool upgrade; /* If the connection is upgradeable */
696 };
697
698 #include <trace/events/rxrpc.h>
699
700 /*
701 * af_rxrpc.c
702 */
703 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
704 extern struct workqueue_struct *rxrpc_workqueue;
705
706 /*
707 * call_accept.c
708 */
709 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
710 void rxrpc_discard_prealloc(struct rxrpc_sock *);
711 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
712 struct rxrpc_connection *,
713 struct sk_buff *);
714 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
715 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
716 rxrpc_notify_rx_t);
717 int rxrpc_reject_call(struct rxrpc_sock *);
718
719 /*
720 * call_event.c
721 */
722 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u16, u32, bool, bool,
723 enum rxrpc_propose_ack_trace);
724 void rxrpc_process_call(struct work_struct *);
725
726 static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
727 unsigned long expire_at,
728 unsigned long now,
729 enum rxrpc_timer_trace why)
730 {
731 trace_rxrpc_timer(call, why, now);
732 timer_reduce(&call->timer, expire_at);
733 }
734
735 /*
736 * call_object.c
737 */
738 extern const char *const rxrpc_call_states[];
739 extern const char *const rxrpc_call_completions[];
740 extern unsigned int rxrpc_max_call_lifetime;
741 extern struct kmem_cache *rxrpc_call_jar;
742
743 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
744 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
745 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
746 struct rxrpc_conn_parameters *,
747 struct sockaddr_rxrpc *,
748 struct rxrpc_call_params *, gfp_t,
749 unsigned int);
750 int rxrpc_retry_client_call(struct rxrpc_sock *,
751 struct rxrpc_call *,
752 struct rxrpc_conn_parameters *,
753 struct sockaddr_rxrpc *,
754 gfp_t);
755 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
756 struct sk_buff *);
757 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
758 int rxrpc_prepare_call_for_retry(struct rxrpc_sock *, struct rxrpc_call *);
759 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
760 bool __rxrpc_queue_call(struct rxrpc_call *);
761 bool rxrpc_queue_call(struct rxrpc_call *);
762 void rxrpc_see_call(struct rxrpc_call *);
763 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
764 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
765 void rxrpc_cleanup_call(struct rxrpc_call *);
766 void rxrpc_destroy_all_calls(struct rxrpc_net *);
767
768 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
769 {
770 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
771 }
772
773 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
774 {
775 return !rxrpc_is_service_call(call);
776 }
777
778 /*
779 * Transition a call to the complete state.
780 */
781 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
782 enum rxrpc_call_completion compl,
783 u32 abort_code,
784 int error)
785 {
786 if (call->state < RXRPC_CALL_COMPLETE) {
787 call->abort_code = abort_code;
788 call->error = error;
789 call->completion = compl,
790 call->state = RXRPC_CALL_COMPLETE;
791 trace_rxrpc_call_complete(call);
792 wake_up(&call->waitq);
793 return true;
794 }
795 return false;
796 }
797
798 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
799 enum rxrpc_call_completion compl,
800 u32 abort_code,
801 int error)
802 {
803 bool ret;
804
805 write_lock_bh(&call->state_lock);
806 ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
807 write_unlock_bh(&call->state_lock);
808 return ret;
809 }
810
811 /*
812 * Record that a call successfully completed.
813 */
814 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
815 {
816 return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
817 }
818
819 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
820 {
821 bool ret;
822
823 write_lock_bh(&call->state_lock);
824 ret = __rxrpc_call_completed(call);
825 write_unlock_bh(&call->state_lock);
826 return ret;
827 }
828
829 /*
830 * Record that a call is locally aborted.
831 */
832 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
833 rxrpc_seq_t seq,
834 u32 abort_code, int error)
835 {
836 trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
837 abort_code, error);
838 return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
839 abort_code, error);
840 }
841
842 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
843 rxrpc_seq_t seq, u32 abort_code, int error)
844 {
845 bool ret;
846
847 write_lock_bh(&call->state_lock);
848 ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
849 write_unlock_bh(&call->state_lock);
850 return ret;
851 }
852
853 /*
854 * Abort a call due to a protocol error.
855 */
856 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
857 struct sk_buff *skb,
858 const char *eproto_why,
859 const char *why,
860 u32 abort_code)
861 {
862 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
863
864 trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
865 return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
866 }
867
868 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
869 __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
870 (abort_why), (abort_code))
871
872 /*
873 * conn_client.c
874 */
875 extern unsigned int rxrpc_max_client_connections;
876 extern unsigned int rxrpc_reap_client_connections;
877 extern unsigned long rxrpc_conn_idle_client_expiry;
878 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
879 extern struct idr rxrpc_client_conn_ids;
880
881 void rxrpc_destroy_client_conn_ids(void);
882 int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
883 struct sockaddr_rxrpc *, gfp_t);
884 void rxrpc_expose_client_call(struct rxrpc_call *);
885 void rxrpc_disconnect_client_call(struct rxrpc_call *);
886 void rxrpc_put_client_conn(struct rxrpc_connection *);
887 void rxrpc_discard_expired_client_conns(struct work_struct *);
888 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
889
890 /*
891 * conn_event.c
892 */
893 void rxrpc_process_connection(struct work_struct *);
894
895 /*
896 * conn_object.c
897 */
898 extern unsigned int rxrpc_connection_expiry;
899 extern unsigned int rxrpc_closed_conn_expiry;
900
901 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
902 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
903 struct sk_buff *);
904 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
905 void rxrpc_disconnect_call(struct rxrpc_call *);
906 void rxrpc_kill_connection(struct rxrpc_connection *);
907 bool rxrpc_queue_conn(struct rxrpc_connection *);
908 void rxrpc_see_connection(struct rxrpc_connection *);
909 void rxrpc_get_connection(struct rxrpc_connection *);
910 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
911 void rxrpc_put_service_conn(struct rxrpc_connection *);
912 void rxrpc_service_connection_reaper(struct work_struct *);
913 void rxrpc_destroy_all_connections(struct rxrpc_net *);
914
915 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
916 {
917 return conn->out_clientflag;
918 }
919
920 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
921 {
922 return !rxrpc_conn_is_client(conn);
923 }
924
925 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
926 {
927 if (!conn)
928 return;
929
930 if (rxrpc_conn_is_client(conn))
931 rxrpc_put_client_conn(conn);
932 else
933 rxrpc_put_service_conn(conn);
934 }
935
936 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
937 unsigned long expire_at)
938 {
939 timer_reduce(&conn->timer, expire_at);
940 }
941
942 /*
943 * conn_service.c
944 */
945 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
946 struct sk_buff *);
947 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
948 void rxrpc_new_incoming_connection(struct rxrpc_sock *,
949 struct rxrpc_connection *, struct sk_buff *);
950 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
951
952 /*
953 * input.c
954 */
955 void rxrpc_data_ready(struct sock *);
956
957 /*
958 * insecure.c
959 */
960 extern const struct rxrpc_security rxrpc_no_security;
961
962 /*
963 * key.c
964 */
965 extern struct key_type key_type_rxrpc;
966 extern struct key_type key_type_rxrpc_s;
967
968 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
969 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
970 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
971 u32);
972
973 /*
974 * local_event.c
975 */
976 extern void rxrpc_process_local_events(struct rxrpc_local *);
977
978 /*
979 * local_object.c
980 */
981 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
982 void __rxrpc_put_local(struct rxrpc_local *);
983 void rxrpc_destroy_all_locals(struct rxrpc_net *);
984
985 static inline void rxrpc_get_local(struct rxrpc_local *local)
986 {
987 atomic_inc(&local->usage);
988 }
989
990 static inline
991 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *local)
992 {
993 return atomic_inc_not_zero(&local->usage) ? local : NULL;
994 }
995
996 static inline void rxrpc_put_local(struct rxrpc_local *local)
997 {
998 if (local && atomic_dec_and_test(&local->usage))
999 __rxrpc_put_local(local);
1000 }
1001
1002 static inline void rxrpc_queue_local(struct rxrpc_local *local)
1003 {
1004 rxrpc_queue_work(&local->processor);
1005 }
1006
1007 /*
1008 * misc.c
1009 */
1010 extern unsigned int rxrpc_max_backlog __read_mostly;
1011 extern unsigned long rxrpc_requested_ack_delay;
1012 extern unsigned long rxrpc_soft_ack_delay;
1013 extern unsigned long rxrpc_idle_ack_delay;
1014 extern unsigned int rxrpc_rx_window_size;
1015 extern unsigned int rxrpc_rx_mtu;
1016 extern unsigned int rxrpc_rx_jumbo_max;
1017 extern unsigned long rxrpc_resend_timeout;
1018
1019 extern const s8 rxrpc_ack_priority[];
1020
1021 /*
1022 * net_ns.c
1023 */
1024 extern unsigned int rxrpc_net_id;
1025 extern struct pernet_operations rxrpc_net_ops;
1026
1027 static inline struct rxrpc_net *rxrpc_net(struct net *net)
1028 {
1029 return net_generic(net, rxrpc_net_id);
1030 }
1031
1032 /*
1033 * output.c
1034 */
1035 int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
1036 int rxrpc_send_abort_packet(struct rxrpc_call *);
1037 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
1038 void rxrpc_reject_packets(struct rxrpc_local *);
1039 void rxrpc_send_keepalive(struct rxrpc_peer *);
1040
1041 /*
1042 * peer_event.c
1043 */
1044 void rxrpc_error_report(struct sock *);
1045 void rxrpc_peer_error_distributor(struct work_struct *);
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_local *,
1056 struct sockaddr_rxrpc *, gfp_t);
1057 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
1058 struct rxrpc_peer *rxrpc_lookup_incoming_peer(struct rxrpc_local *,
1059 struct rxrpc_peer *);
1060
1061 static inline struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
1062 {
1063 atomic_inc(&peer->usage);
1064 return peer;
1065 }
1066
1067 static inline
1068 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
1069 {
1070 return atomic_inc_not_zero(&peer->usage) ? peer : NULL;
1071 }
1072
1073 extern void __rxrpc_put_peer(struct rxrpc_peer *peer);
1074 static inline void rxrpc_put_peer(struct rxrpc_peer *peer)
1075 {
1076 if (peer && atomic_dec_and_test(&peer->usage))
1077 __rxrpc_put_peer(peer);
1078 }
1079
1080 /*
1081 * proc.c
1082 */
1083 extern const struct file_operations rxrpc_call_seq_fops;
1084 extern const struct file_operations rxrpc_connection_seq_fops;
1085
1086 /*
1087 * recvmsg.c
1088 */
1089 void rxrpc_notify_socket(struct rxrpc_call *);
1090 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1091
1092 /*
1093 * rxkad.c
1094 */
1095 #ifdef CONFIG_RXKAD
1096 extern const struct rxrpc_security rxkad;
1097 #endif
1098
1099 /*
1100 * security.c
1101 */
1102 int __init rxrpc_init_security(void);
1103 void rxrpc_exit_security(void);
1104 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1105 int rxrpc_init_server_conn_security(struct rxrpc_connection *);
1106
1107 /*
1108 * sendmsg.c
1109 */
1110 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1111
1112 /*
1113 * skbuff.c
1114 */
1115 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1116 void rxrpc_packet_destructor(struct sk_buff *);
1117 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1118 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1119 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1120 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1121 void rxrpc_lose_skb(struct sk_buff *, enum rxrpc_skb_trace);
1122 void rxrpc_purge_queue(struct sk_buff_head *);
1123
1124 /*
1125 * sysctl.c
1126 */
1127 #ifdef CONFIG_SYSCTL
1128 extern int __init rxrpc_sysctl_init(void);
1129 extern void rxrpc_sysctl_exit(void);
1130 #else
1131 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1132 static inline void rxrpc_sysctl_exit(void) {}
1133 #endif
1134
1135 /*
1136 * utils.c
1137 */
1138 int rxrpc_extract_addr_from_skb(struct rxrpc_local *, struct sockaddr_rxrpc *,
1139 struct sk_buff *);
1140
1141 static inline bool before(u32 seq1, u32 seq2)
1142 {
1143 return (s32)(seq1 - seq2) < 0;
1144 }
1145 static inline bool before_eq(u32 seq1, u32 seq2)
1146 {
1147 return (s32)(seq1 - seq2) <= 0;
1148 }
1149 static inline bool after(u32 seq1, u32 seq2)
1150 {
1151 return (s32)(seq1 - seq2) > 0;
1152 }
1153 static inline bool after_eq(u32 seq1, u32 seq2)
1154 {
1155 return (s32)(seq1 - seq2) >= 0;
1156 }
1157
1158 /*
1159 * debug tracing
1160 */
1161 extern unsigned int rxrpc_debug;
1162
1163 #define dbgprintk(FMT,...) \
1164 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1165
1166 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1167 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1168 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1169 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1170 #define knet(FMT,...) dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1171
1172
1173 #if defined(__KDEBUG)
1174 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1175 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1176 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1177 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1178 #define _net(FMT,...) knet(FMT,##__VA_ARGS__)
1179
1180 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1181 #define RXRPC_DEBUG_KENTER 0x01
1182 #define RXRPC_DEBUG_KLEAVE 0x02
1183 #define RXRPC_DEBUG_KDEBUG 0x04
1184 #define RXRPC_DEBUG_KPROTO 0x08
1185 #define RXRPC_DEBUG_KNET 0x10
1186
1187 #define _enter(FMT,...) \
1188 do { \
1189 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1190 kenter(FMT,##__VA_ARGS__); \
1191 } while (0)
1192
1193 #define _leave(FMT,...) \
1194 do { \
1195 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1196 kleave(FMT,##__VA_ARGS__); \
1197 } while (0)
1198
1199 #define _debug(FMT,...) \
1200 do { \
1201 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1202 kdebug(FMT,##__VA_ARGS__); \
1203 } while (0)
1204
1205 #define _proto(FMT,...) \
1206 do { \
1207 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1208 kproto(FMT,##__VA_ARGS__); \
1209 } while (0)
1210
1211 #define _net(FMT,...) \
1212 do { \
1213 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET)) \
1214 knet(FMT,##__VA_ARGS__); \
1215 } while (0)
1216
1217 #else
1218 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1219 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1220 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1221 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1222 #define _net(FMT,...) no_printk("@@@ "FMT ,##__VA_ARGS__)
1223 #endif
1224
1225 /*
1226 * debug assertion checking
1227 */
1228 #if 1 // defined(__KDEBUGALL)
1229
1230 #define ASSERT(X) \
1231 do { \
1232 if (unlikely(!(X))) { \
1233 pr_err("Assertion failed\n"); \
1234 BUG(); \
1235 } \
1236 } while (0)
1237
1238 #define ASSERTCMP(X, OP, Y) \
1239 do { \
1240 __typeof__(X) _x = (X); \
1241 __typeof__(Y) _y = (__typeof__(X))(Y); \
1242 if (unlikely(!(_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 #define ASSERTIF(C, X) \
1251 do { \
1252 if (unlikely((C) && !(X))) { \
1253 pr_err("Assertion failed\n"); \
1254 BUG(); \
1255 } \
1256 } while (0)
1257
1258 #define ASSERTIFCMP(C, X, OP, Y) \
1259 do { \
1260 __typeof__(X) _x = (X); \
1261 __typeof__(Y) _y = (__typeof__(X))(Y); \
1262 if (unlikely((C) && !(_x OP _y))) { \
1263 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1264 (unsigned long)_x, (unsigned long)_x, #OP, \
1265 (unsigned long)_y, (unsigned long)_y); \
1266 BUG(); \
1267 } \
1268 } while (0)
1269
1270 #else
1271
1272 #define ASSERT(X) \
1273 do { \
1274 } while (0)
1275
1276 #define ASSERTCMP(X, OP, Y) \
1277 do { \
1278 } while (0)
1279
1280 #define ASSERTIF(C, X) \
1281 do { \
1282 } while (0)
1283
1284 #define ASSERTIFCMP(C, X, OP, Y) \
1285 do { \
1286 } while (0)
1287
1288 #endif /* __KDEBUGALL */
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git