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Linux 5.7.7
[linux/fpc-iii.git] / net / rxrpc / ar-internal.h
blob9fe264bec70ce74d1fab32dacd3cd84e90948aa0
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 <linux/win_minmax.h>
11 #include <net/net_namespace.h>
12 #include <net/netns/generic.h>
13 #include <net/sock.h>
14 #include <net/af_rxrpc.h>
15 #include "protocol.h"
16
17 #if 0
18 #define CHECK_SLAB_OKAY(X) \
19 BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
20 (POISON_FREE << 8 | POISON_FREE))
21 #else
22 #define CHECK_SLAB_OKAY(X) do {} while (0)
23 #endif
24
25 #define FCRYPT_BSIZE 8
26 struct rxrpc_crypt {
27 union {
28 u8 x[FCRYPT_BSIZE];
29 __be32 n[2];
30 };
31 } __attribute__((aligned(8)));
32
33 #define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS))
34 #define rxrpc_queue_delayed_work(WS,D) \
35 queue_delayed_work(rxrpc_workqueue, (WS), (D))
36
37 struct rxrpc_connection;
38
39 /*
40 * Mark applied to socket buffers in skb->mark. skb->priority is used
41 * to pass supplementary information.
42 */
43 enum rxrpc_skb_mark {
44 RXRPC_SKB_MARK_REJECT_BUSY, /* Reject with BUSY */
45 RXRPC_SKB_MARK_REJECT_ABORT, /* Reject with ABORT (code in skb->priority) */
46 };
47
48 /*
49 * sk_state for RxRPC sockets
50 */
51 enum {
52 RXRPC_UNBOUND = 0,
53 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */
54 RXRPC_CLIENT_BOUND, /* client local address bound */
55 RXRPC_SERVER_BOUND, /* server local address bound */
56 RXRPC_SERVER_BOUND2, /* second server local address bound */
57 RXRPC_SERVER_LISTENING, /* server listening for connections */
58 RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */
59 RXRPC_CLOSE, /* socket is being closed */
60 };
61
62 /*
63 * Per-network namespace data.
64 */
65 struct rxrpc_net {
66 struct proc_dir_entry *proc_net; /* Subdir in /proc/net */
67 u32 epoch; /* Local epoch for detecting local-end reset */
68 struct list_head calls; /* List of calls active in this namespace */
69 rwlock_t call_lock; /* Lock for ->calls */
70 atomic_t nr_calls; /* Count of allocated calls */
71
72 atomic_t nr_conns;
73 struct list_head conn_proc_list; /* List of conns in this namespace for proc */
74 struct list_head service_conns; /* Service conns in this namespace */
75 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */
76 struct work_struct service_conn_reaper;
77 struct timer_list service_conn_reap_timer;
78
79 unsigned int nr_client_conns;
80 unsigned int nr_active_client_conns;
81 bool kill_all_client_conns;
82 bool live;
83 spinlock_t client_conn_cache_lock; /* Lock for ->*_client_conns */
84 spinlock_t client_conn_discard_lock; /* Prevent multiple discarders */
85 struct list_head waiting_client_conns;
86 struct list_head active_client_conns;
87 struct list_head idle_client_conns;
88 struct work_struct client_conn_reaper;
89 struct timer_list client_conn_reap_timer;
90
91 struct list_head local_endpoints;
92 struct mutex local_mutex; /* Lock for ->local_endpoints */
93
94 DECLARE_HASHTABLE (peer_hash, 10);
95 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */
96
97 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
98 u8 peer_keepalive_cursor;
99 time64_t peer_keepalive_base;
100 struct list_head peer_keepalive[32];
101 struct list_head peer_keepalive_new;
102 struct timer_list peer_keepalive_timer;
103 struct work_struct peer_keepalive_work;
104 };
105
106 /*
107 * Service backlog preallocation.
108 *
109 * This contains circular buffers of preallocated peers, connections and calls
110 * for incoming service calls and their head and tail pointers. This allows
111 * calls to be set up in the data_ready handler, thereby avoiding the need to
112 * shuffle packets around so much.
113 */
114 struct rxrpc_backlog {
115 unsigned short peer_backlog_head;
116 unsigned short peer_backlog_tail;
117 unsigned short conn_backlog_head;
118 unsigned short conn_backlog_tail;
119 unsigned short call_backlog_head;
120 unsigned short call_backlog_tail;
121 #define RXRPC_BACKLOG_MAX 32
122 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX];
123 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
124 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX];
125 };
126
127 /*
128 * RxRPC socket definition
129 */
130 struct rxrpc_sock {
131 /* WARNING: sk has to be the first member */
132 struct sock sk;
133 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
134 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
135 struct rxrpc_local *local; /* local endpoint */
136 struct rxrpc_backlog *backlog; /* Preallocation for services */
137 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */
138 struct list_head sock_calls; /* List of calls owned by this socket */
139 struct list_head to_be_accepted; /* calls awaiting acceptance */
140 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */
141 rwlock_t recvmsg_lock; /* Lock for recvmsg_q */
142 struct key *key; /* security for this socket */
143 struct key *securities; /* list of server security descriptors */
144 struct rb_root calls; /* User ID -> call mapping */
145 unsigned long flags;
146 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */
147 rwlock_t call_lock; /* lock for calls */
148 u32 min_sec_level; /* minimum security level */
149 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT
150 bool exclusive; /* Exclusive connection for a client socket */
151 u16 second_service; /* Additional service bound to the endpoint */
152 struct {
153 /* Service upgrade information */
154 u16 from; /* Service ID to upgrade (if not 0) */
155 u16 to; /* service ID to upgrade to */
156 } service_upgrade;
157 sa_family_t family; /* Protocol family created with */
158 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */
159 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */
160 };
161
162 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
163
164 /*
165 * CPU-byteorder normalised Rx packet header.
166 */
167 struct rxrpc_host_header {
168 u32 epoch; /* client boot timestamp */
169 u32 cid; /* connection and channel ID */
170 u32 callNumber; /* call ID (0 for connection-level packets) */
171 u32 seq; /* sequence number of pkt in call stream */
172 u32 serial; /* serial number of pkt sent to network */
173 u8 type; /* packet type */
174 u8 flags; /* packet flags */
175 u8 userStatus; /* app-layer defined status */
176 u8 securityIndex; /* security protocol ID */
177 union {
178 u16 _rsvd; /* reserved */
179 u16 cksum; /* kerberos security checksum */
180 };
181 u16 serviceId; /* service ID */
182 } __packed;
183
184 /*
185 * RxRPC socket buffer private variables
186 * - max 48 bytes (struct sk_buff::cb)
187 */
188 struct rxrpc_skb_priv {
189 atomic_t nr_ring_pins; /* Number of rxtx ring pins */
190 u8 nr_subpackets; /* Number of subpackets */
191 u8 rx_flags; /* Received packet flags */
192 #define RXRPC_SKB_INCL_LAST 0x01 /* - Includes last packet */
193 #define RXRPC_SKB_TX_BUFFER 0x02 /* - Is transmit buffer */
194 union {
195 int remain; /* amount of space remaining for next write */
196
197 /* List of requested ACKs on subpackets */
198 unsigned long rx_req_ack[(RXRPC_MAX_NR_JUMBO + BITS_PER_LONG - 1) /
199 BITS_PER_LONG];
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 u32 no_key_abort; /* Abort code indicating no key */
214
215 /* Initialise a security service */
216 int (*init)(void);
217
218 /* Clean up a security service */
219 void (*exit)(void);
220
221 /* initialise a connection's security */
222 int (*init_connection_security)(struct rxrpc_connection *);
223
224 /* prime a connection's packet security */
225 int (*prime_packet_security)(struct rxrpc_connection *);
226
227 /* impose security on a packet */
228 int (*secure_packet)(struct rxrpc_call *,
229 struct sk_buff *,
230 size_t,
231 void *);
232
233 /* verify the security on a received packet */
234 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *,
235 unsigned int, unsigned int, rxrpc_seq_t, u16);
236
237 /* Free crypto request on a call */
238 void (*free_call_crypto)(struct rxrpc_call *);
239
240 /* Locate the data in a received packet that has been verified. */
241 void (*locate_data)(struct rxrpc_call *, struct sk_buff *,
242 unsigned int *, unsigned int *);
243
244 /* issue a challenge */
245 int (*issue_challenge)(struct rxrpc_connection *);
246
247 /* respond to a challenge */
248 int (*respond_to_challenge)(struct rxrpc_connection *,
249 struct sk_buff *,
250 u32 *);
251
252 /* verify a response */
253 int (*verify_response)(struct rxrpc_connection *,
254 struct sk_buff *,
255 u32 *);
256
257 /* clear connection security */
258 void (*clear)(struct rxrpc_connection *);
259 };
260
261 /*
262 * RxRPC local transport endpoint description
263 * - owned by a single AF_RXRPC socket
264 * - pointed to by transport socket struct sk_user_data
265 */
266 struct rxrpc_local {
267 struct rcu_head rcu;
268 atomic_t active_users; /* Number of users of the local endpoint */
269 atomic_t usage; /* Number of references to the structure */
270 struct rxrpc_net *rxnet; /* The network ns in which this resides */
271 struct list_head link;
272 struct socket *socket; /* my UDP socket */
273 struct work_struct processor;
274 struct rxrpc_sock __rcu *service; /* Service(s) listening on this endpoint */
275 struct rw_semaphore defrag_sem; /* control re-enablement of IP DF bit */
276 struct sk_buff_head reject_queue; /* packets awaiting rejection */
277 struct sk_buff_head event_queue; /* endpoint event packets awaiting processing */
278 struct rb_root client_conns; /* Client connections by socket params */
279 spinlock_t client_conns_lock; /* Lock for client_conns */
280 spinlock_t lock; /* access lock */
281 rwlock_t services_lock; /* lock for services list */
282 int debug_id; /* debug ID for printks */
283 bool dead;
284 bool service_closed; /* Service socket closed */
285 struct sockaddr_rxrpc srx; /* local address */
286 };
287
288 /*
289 * RxRPC remote transport endpoint definition
290 * - matched by local endpoint, remote port, address and protocol type
291 */
292 struct rxrpc_peer {
293 struct rcu_head rcu; /* This must be first */
294 atomic_t usage;
295 unsigned long hash_key;
296 struct hlist_node hash_link;
297 struct rxrpc_local *local;
298 struct hlist_head error_targets; /* targets for net error distribution */
299 struct rb_root service_conns; /* Service connections */
300 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */
301 time64_t last_tx_at; /* Last time packet sent here */
302 seqlock_t service_conn_lock;
303 spinlock_t lock; /* access lock */
304 unsigned int if_mtu; /* interface MTU for this peer */
305 unsigned int mtu; /* network MTU for this peer */
306 unsigned int maxdata; /* data size (MTU - hdrsize) */
307 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */
308 int debug_id; /* debug ID for printks */
309 struct sockaddr_rxrpc srx; /* remote address */
310
311 /* calculated RTT cache */
312 #define RXRPC_RTT_CACHE_SIZE 32
313 spinlock_t rtt_input_lock; /* RTT lock for input routine */
314 ktime_t rtt_last_req; /* Time of last RTT request */
315 unsigned int rtt_count; /* Number of samples we've got */
316
317 u32 srtt_us; /* smoothed round trip time << 3 in usecs */
318 u32 mdev_us; /* medium deviation */
319 u32 mdev_max_us; /* maximal mdev for the last rtt period */
320 u32 rttvar_us; /* smoothed mdev_max */
321 u32 rto_j; /* Retransmission timeout in jiffies */
322 u8 backoff; /* Backoff timeout */
323
324 u8 cong_cwnd; /* Congestion window size */
325 };
326
327 /*
328 * Keys for matching a connection.
329 */
330 struct rxrpc_conn_proto {
331 union {
332 struct {
333 u32 epoch; /* epoch of this connection */
334 u32 cid; /* connection ID */
335 };
336 u64 index_key;
337 };
338 };
339
340 struct rxrpc_conn_parameters {
341 struct rxrpc_local *local; /* Representation of local endpoint */
342 struct rxrpc_peer *peer; /* Remote endpoint */
343 struct key *key; /* Security details */
344 bool exclusive; /* T if conn is exclusive */
345 bool upgrade; /* T if service ID can be upgraded */
346 u16 service_id; /* Service ID for this connection */
347 u32 security_level; /* Security level selected */
348 };
349
350 /*
351 * Bits in the connection flags.
352 */
353 enum rxrpc_conn_flag {
354 RXRPC_CONN_HAS_IDR, /* Has a client conn ID assigned */
355 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */
356 RXRPC_CONN_IN_CLIENT_CONNS, /* Conn is in local->client_conns */
357 RXRPC_CONN_EXPOSED, /* Conn has extra ref for exposure */
358 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */
359 RXRPC_CONN_COUNTED, /* Counted by rxrpc_nr_client_conns */
360 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
361 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */
362 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */
363 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */
364 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */
365 };
366
367 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \
368 (1UL << RXRPC_CONN_FINAL_ACK_1) | \
369 (1UL << RXRPC_CONN_FINAL_ACK_2) | \
370 (1UL << RXRPC_CONN_FINAL_ACK_3))
371
372 /*
373 * Events that can be raised upon a connection.
374 */
375 enum rxrpc_conn_event {
376 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */
377 };
378
379 /*
380 * The connection cache state.
381 */
382 enum rxrpc_conn_cache_state {
383 RXRPC_CONN_CLIENT_INACTIVE, /* Conn is not yet listed */
384 RXRPC_CONN_CLIENT_WAITING, /* Conn is on wait list, waiting for capacity */
385 RXRPC_CONN_CLIENT_ACTIVE, /* Conn is on active list, doing calls */
386 RXRPC_CONN_CLIENT_UPGRADE, /* Conn is on active list, probing for upgrade */
387 RXRPC_CONN_CLIENT_CULLED, /* Conn is culled and delisted, doing calls */
388 RXRPC_CONN_CLIENT_IDLE, /* Conn is on idle list, doing mostly nothing */
389 RXRPC_CONN__NR_CACHE_STATES
390 };
391
392 /*
393 * The connection protocol state.
394 */
395 enum rxrpc_conn_proto_state {
396 RXRPC_CONN_UNUSED, /* Connection not yet attempted */
397 RXRPC_CONN_CLIENT, /* Client connection */
398 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */
399 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */
400 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
401 RXRPC_CONN_SERVICE, /* Service secured connection */
402 RXRPC_CONN_REMOTELY_ABORTED, /* Conn aborted by peer */
403 RXRPC_CONN_LOCALLY_ABORTED, /* Conn aborted locally */
404 RXRPC_CONN__NR_STATES
405 };
406
407 /*
408 * RxRPC connection definition
409 * - matched by { local, peer, epoch, conn_id, direction }
410 * - each connection can only handle four simultaneous calls
411 */
412 struct rxrpc_connection {
413 struct rxrpc_conn_proto proto;
414 struct rxrpc_conn_parameters params;
415
416 atomic_t usage;
417 struct rcu_head rcu;
418 struct list_head cache_link;
419
420 spinlock_t channel_lock;
421 unsigned char active_chans; /* Mask of active channels */
422 #define RXRPC_ACTIVE_CHANS_MASK ((1 << RXRPC_MAXCALLS) - 1)
423 struct list_head waiting_calls; /* Calls waiting for channels */
424 struct rxrpc_channel {
425 unsigned long final_ack_at; /* Time at which to issue final ACK */
426 struct rxrpc_call __rcu *call; /* Active call */
427 unsigned int call_debug_id; /* call->debug_id */
428 u32 call_id; /* ID of current call */
429 u32 call_counter; /* Call ID counter */
430 u32 last_call; /* ID of last call */
431 u8 last_type; /* Type of last packet */
432 union {
433 u32 last_seq;
434 u32 last_abort;
435 };
436 } channels[RXRPC_MAXCALLS];
437
438 struct timer_list timer; /* Conn event timer */
439 struct work_struct processor; /* connection event processor */
440 union {
441 struct rb_node client_node; /* Node in local->client_conns */
442 struct rb_node service_node; /* Node in peer->service_conns */
443 };
444 struct list_head proc_link; /* link in procfs list */
445 struct list_head link; /* link in master connection list */
446 struct sk_buff_head rx_queue; /* received conn-level packets */
447 const struct rxrpc_security *security; /* applied security module */
448 struct key *server_key; /* security for this service */
449 struct crypto_sync_skcipher *cipher; /* encryption handle */
450 struct rxrpc_crypt csum_iv; /* packet checksum base */
451 unsigned long flags;
452 unsigned long events;
453 unsigned long idle_timestamp; /* Time at which last became idle */
454 spinlock_t state_lock; /* state-change lock */
455 enum rxrpc_conn_cache_state cache_state;
456 enum rxrpc_conn_proto_state state; /* current state of connection */
457 u32 abort_code; /* Abort code of connection abort */
458 int debug_id; /* debug ID for printks */
459 atomic_t serial; /* packet serial number counter */
460 unsigned int hi_serial; /* highest serial number received */
461 u32 security_nonce; /* response re-use preventer */
462 u32 service_id; /* Service ID, possibly upgraded */
463 u8 size_align; /* data size alignment (for security) */
464 u8 security_size; /* security header size */
465 u8 security_ix; /* security type */
466 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
467 short error; /* Local error code */
468 };
469
470 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
471 {
472 return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
473 }
474
475 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
476 {
477 return !rxrpc_to_server(sp);
478 }
479
480 /*
481 * Flags in call->flags.
482 */
483 enum rxrpc_call_flag {
484 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */
485 RXRPC_CALL_HAS_USERID, /* has a user ID attached */
486 RXRPC_CALL_IS_SERVICE, /* Call is service call */
487 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */
488 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */
489 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */
490 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */
491 RXRPC_CALL_PINGING, /* Ping in process */
492 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */
493 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */
494 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */
495 RXRPC_CALL_RX_UNDERRUN, /* Got data underrun */
496 RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */
497 };
498
499 /*
500 * Events that can be raised on a call.
501 */
502 enum rxrpc_call_event {
503 RXRPC_CALL_EV_ACK, /* need to generate ACK */
504 RXRPC_CALL_EV_ABORT, /* need to generate abort */
505 RXRPC_CALL_EV_RESEND, /* Tx resend required */
506 RXRPC_CALL_EV_PING, /* Ping send required */
507 RXRPC_CALL_EV_EXPIRED, /* Expiry occurred */
508 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */
509 };
510
511 /*
512 * The states that a call can be in.
513 */
514 enum rxrpc_call_state {
515 RXRPC_CALL_UNINITIALISED,
516 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */
517 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
518 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */
519 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */
520 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */
521 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */
522 RXRPC_CALL_SERVER_ACCEPTING, /* - server accepting request */
523 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
524 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */
525 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */
526 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */
527 RXRPC_CALL_COMPLETE, /* - call complete */
528 NR__RXRPC_CALL_STATES
529 };
530
531 /*
532 * Call completion condition (state == RXRPC_CALL_COMPLETE).
533 */
534 enum rxrpc_call_completion {
535 RXRPC_CALL_SUCCEEDED, /* - Normal termination */
536 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */
537 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */
538 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */
539 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */
540 NR__RXRPC_CALL_COMPLETIONS
541 };
542
543 /*
544 * Call Tx congestion management modes.
545 */
546 enum rxrpc_congest_mode {
547 RXRPC_CALL_SLOW_START,
548 RXRPC_CALL_CONGEST_AVOIDANCE,
549 RXRPC_CALL_PACKET_LOSS,
550 RXRPC_CALL_FAST_RETRANSMIT,
551 NR__RXRPC_CONGEST_MODES
552 };
553
554 /*
555 * RxRPC call definition
556 * - matched by { connection, call_id }
557 */
558 struct rxrpc_call {
559 struct rcu_head rcu;
560 struct rxrpc_connection *conn; /* connection carrying call */
561 struct rxrpc_peer *peer; /* Peer record for remote address */
562 struct rxrpc_sock __rcu *socket; /* socket responsible */
563 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */
564 const struct rxrpc_security *security; /* applied security module */
565 struct mutex user_mutex; /* User access mutex */
566 unsigned long ack_at; /* When deferred ACK needs to happen */
567 unsigned long ack_lost_at; /* When ACK is figured as lost */
568 unsigned long resend_at; /* When next resend needs to happen */
569 unsigned long ping_at; /* When next to send a ping */
570 unsigned long keepalive_at; /* When next to send a keepalive ping */
571 unsigned long expect_rx_by; /* When we expect to get a packet by */
572 unsigned long expect_req_by; /* When we expect to get a request DATA packet by */
573 unsigned long expect_term_by; /* When we expect call termination by */
574 u32 next_rx_timo; /* Timeout for next Rx packet (jif) */
575 u32 next_req_timo; /* Timeout for next Rx request packet (jif) */
576 struct skcipher_request *cipher_req; /* Packet cipher request buffer */
577 struct timer_list timer; /* Combined event timer */
578 struct work_struct processor; /* Event processor */
579 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */
580 struct list_head link; /* link in master call list */
581 struct list_head chan_wait_link; /* Link in conn->waiting_calls */
582 struct hlist_node error_link; /* link in error distribution list */
583 struct list_head accept_link; /* Link in rx->acceptq */
584 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */
585 struct list_head sock_link; /* Link in rx->sock_calls */
586 struct rb_node sock_node; /* Node in rx->calls */
587 struct sk_buff *tx_pending; /* Tx socket buffer being filled */
588 wait_queue_head_t waitq; /* Wait queue for channel or Tx */
589 s64 tx_total_len; /* Total length left to be transmitted (or -1) */
590 __be32 crypto_buf[2]; /* Temporary packet crypto buffer */
591 unsigned long user_call_ID; /* user-defined call ID */
592 unsigned long flags;
593 unsigned long events;
594 spinlock_t lock;
595 spinlock_t notify_lock; /* Kernel notification lock */
596 rwlock_t state_lock; /* lock for state transition */
597 u32 abort_code; /* Local/remote abort code */
598 int error; /* Local error incurred */
599 enum rxrpc_call_state state; /* current state of call */
600 enum rxrpc_call_completion completion; /* Call completion condition */
601 atomic_t usage;
602 u16 service_id; /* service ID */
603 u8 security_ix; /* Security type */
604 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */
605 u32 call_id; /* call ID on connection */
606 u32 cid; /* connection ID plus channel index */
607 int debug_id; /* debug ID for printks */
608 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */
609 unsigned short rx_pkt_len; /* Current recvmsg packet len */
610 bool rx_pkt_last; /* Current recvmsg packet is last */
611
612 /* Rx/Tx circular buffer, depending on phase.
613 *
614 * In the Rx phase, packets are annotated with 0 or the number of the
615 * segment of a jumbo packet each buffer refers to. There can be up to
616 * 47 segments in a maximum-size UDP packet.
617 *
618 * In the Tx phase, packets are annotated with which buffers have been
619 * acked.
620 */
621 #define RXRPC_RXTX_BUFF_SIZE 64
622 #define RXRPC_RXTX_BUFF_MASK (RXRPC_RXTX_BUFF_SIZE - 1)
623 #define RXRPC_INIT_RX_WINDOW_SIZE 63
624 struct sk_buff **rxtx_buffer;
625 u8 *rxtx_annotations;
626 #define RXRPC_TX_ANNO_ACK 0
627 #define RXRPC_TX_ANNO_UNACK 1
628 #define RXRPC_TX_ANNO_NAK 2
629 #define RXRPC_TX_ANNO_RETRANS 3
630 #define RXRPC_TX_ANNO_MASK 0x03
631 #define RXRPC_TX_ANNO_LAST 0x04
632 #define RXRPC_TX_ANNO_RESENT 0x08
633
634 #define RXRPC_RX_ANNO_SUBPACKET 0x3f /* Subpacket number in jumbogram */
635 #define RXRPC_RX_ANNO_VERIFIED 0x80 /* Set if verified and decrypted */
636 rxrpc_seq_t tx_hard_ack; /* Dead slot in buffer; the first transmitted but
637 * not hard-ACK'd packet follows this.
638 */
639 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */
640 u16 tx_backoff; /* Delay to insert due to Tx failure */
641
642 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS
643 * is fixed, we keep these numbers in terms of segments (ie. DATA
644 * packets) rather than bytes.
645 */
646 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN
647 u8 cong_cwnd; /* Congestion window size */
648 u8 cong_extra; /* Extra to send for congestion management */
649 u8 cong_ssthresh; /* Slow-start threshold */
650 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */
651 u8 cong_dup_acks; /* Count of ACKs showing missing packets */
652 u8 cong_cumul_acks; /* Cumulative ACK count */
653 ktime_t cong_tstamp; /* Last time cwnd was changed */
654
655 rxrpc_seq_t rx_hard_ack; /* Dead slot in buffer; the first received but not
656 * consumed packet follows this.
657 */
658 rxrpc_seq_t rx_top; /* Highest Rx slot allocated. */
659 rxrpc_seq_t rx_expect_next; /* Expected next packet sequence number */
660 rxrpc_serial_t rx_serial; /* Highest serial received for this call */
661 u8 rx_winsize; /* Size of Rx window */
662 u8 tx_winsize; /* Maximum size of Tx window */
663 bool tx_phase; /* T if transmission phase, F if receive phase */
664 u8 nr_jumbo_bad; /* Number of jumbo dups/exceeds-windows */
665
666 spinlock_t input_lock; /* Lock for packet input to this call */
667
668 /* receive-phase ACK management */
669 u8 ackr_reason; /* reason to ACK */
670 rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */
671 rxrpc_serial_t ackr_first_seq; /* first sequence number received */
672 rxrpc_seq_t ackr_prev_seq; /* previous sequence number received */
673 rxrpc_seq_t ackr_consumed; /* Highest packet shown consumed */
674 rxrpc_seq_t ackr_seen; /* Highest packet shown seen */
675
676 /* ping management */
677 rxrpc_serial_t ping_serial; /* Last ping sent */
678 ktime_t ping_time; /* Time last ping sent */
679
680 /* transmission-phase ACK management */
681 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */
682 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
683 rxrpc_seq_t acks_lost_top; /* tx_top at the time lost-ack ping sent */
684 rxrpc_serial_t acks_lost_ping; /* Serial number of probe ACK */
685 };
686
687 /*
688 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
689 */
690 struct rxrpc_ack_summary {
691 u8 ack_reason;
692 u8 nr_acks; /* Number of ACKs in packet */
693 u8 nr_nacks; /* Number of NACKs in packet */
694 u8 nr_new_acks; /* Number of new ACKs in packet */
695 u8 nr_new_nacks; /* Number of new NACKs in packet */
696 u8 nr_rot_new_acks; /* Number of rotated new ACKs */
697 bool new_low_nack; /* T if new low NACK found */
698 bool retrans_timeo; /* T if reTx due to timeout happened */
699 u8 flight_size; /* Number of unreceived transmissions */
700 /* Place to stash values for tracing */
701 enum rxrpc_congest_mode mode:8;
702 u8 cwnd;
703 u8 ssthresh;
704 u8 dup_acks;
705 u8 cumulative_acks;
706 };
707
708 /*
709 * sendmsg() cmsg-specified parameters.
710 */
711 enum rxrpc_command {
712 RXRPC_CMD_SEND_DATA, /* send data message */
713 RXRPC_CMD_SEND_ABORT, /* request abort generation */
714 RXRPC_CMD_ACCEPT, /* [server] accept incoming call */
715 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
716 };
717
718 struct rxrpc_call_params {
719 s64 tx_total_len; /* Total Tx data length (if send data) */
720 unsigned long user_call_ID; /* User's call ID */
721 struct {
722 u32 hard; /* Maximum lifetime (sec) */
723 u32 idle; /* Max time since last data packet (msec) */
724 u32 normal; /* Max time since last call packet (msec) */
725 } timeouts;
726 u8 nr_timeouts; /* Number of timeouts specified */
727 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */
728 };
729
730 struct rxrpc_send_params {
731 struct rxrpc_call_params call;
732 u32 abort_code; /* Abort code to Tx (if abort) */
733 enum rxrpc_command command : 8; /* The command to implement */
734 bool exclusive; /* Shared or exclusive call */
735 bool upgrade; /* If the connection is upgradeable */
736 };
737
738 #include <trace/events/rxrpc.h>
739
740 /*
741 * af_rxrpc.c
742 */
743 extern atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
744 extern struct workqueue_struct *rxrpc_workqueue;
745
746 /*
747 * call_accept.c
748 */
749 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
750 void rxrpc_discard_prealloc(struct rxrpc_sock *);
751 struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *,
752 struct rxrpc_sock *,
753 struct sk_buff *);
754 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
755 struct rxrpc_call *rxrpc_accept_call(struct rxrpc_sock *, unsigned long,
756 rxrpc_notify_rx_t);
757 int rxrpc_reject_call(struct rxrpc_sock *);
758
759 /*
760 * call_event.c
761 */
762 void rxrpc_propose_ACK(struct rxrpc_call *, u8, u32, bool, bool,
763 enum rxrpc_propose_ack_trace);
764 void rxrpc_process_call(struct work_struct *);
765
766 static inline void rxrpc_reduce_call_timer(struct rxrpc_call *call,
767 unsigned long expire_at,
768 unsigned long now,
769 enum rxrpc_timer_trace why)
770 {
771 trace_rxrpc_timer(call, why, now);
772 timer_reduce(&call->timer, expire_at);
773 }
774
775 /*
776 * call_object.c
777 */
778 extern const char *const rxrpc_call_states[];
779 extern const char *const rxrpc_call_completions[];
780 extern unsigned int rxrpc_max_call_lifetime;
781 extern struct kmem_cache *rxrpc_call_jar;
782
783 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
784 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
785 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
786 struct rxrpc_conn_parameters *,
787 struct sockaddr_rxrpc *,
788 struct rxrpc_call_params *, gfp_t,
789 unsigned int);
790 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
791 struct sk_buff *);
792 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
793 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
794 bool __rxrpc_queue_call(struct rxrpc_call *);
795 bool rxrpc_queue_call(struct rxrpc_call *);
796 void rxrpc_see_call(struct rxrpc_call *);
797 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
798 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
799 void rxrpc_cleanup_call(struct rxrpc_call *);
800 void rxrpc_destroy_all_calls(struct rxrpc_net *);
801
802 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
803 {
804 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
805 }
806
807 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
808 {
809 return !rxrpc_is_service_call(call);
810 }
811
812 /*
813 * Transition a call to the complete state.
814 */
815 static inline bool __rxrpc_set_call_completion(struct rxrpc_call *call,
816 enum rxrpc_call_completion compl,
817 u32 abort_code,
818 int error)
819 {
820 if (call->state < RXRPC_CALL_COMPLETE) {
821 call->abort_code = abort_code;
822 call->error = error;
823 call->completion = compl,
824 call->state = RXRPC_CALL_COMPLETE;
825 trace_rxrpc_call_complete(call);
826 wake_up(&call->waitq);
827 return true;
828 }
829 return false;
830 }
831
832 static inline bool rxrpc_set_call_completion(struct rxrpc_call *call,
833 enum rxrpc_call_completion compl,
834 u32 abort_code,
835 int error)
836 {
837 bool ret;
838
839 write_lock_bh(&call->state_lock);
840 ret = __rxrpc_set_call_completion(call, compl, abort_code, error);
841 write_unlock_bh(&call->state_lock);
842 return ret;
843 }
844
845 /*
846 * Record that a call successfully completed.
847 */
848 static inline bool __rxrpc_call_completed(struct rxrpc_call *call)
849 {
850 return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0);
851 }
852
853 static inline bool rxrpc_call_completed(struct rxrpc_call *call)
854 {
855 bool ret;
856
857 write_lock_bh(&call->state_lock);
858 ret = __rxrpc_call_completed(call);
859 write_unlock_bh(&call->state_lock);
860 return ret;
861 }
862
863 /*
864 * Record that a call is locally aborted.
865 */
866 static inline bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call,
867 rxrpc_seq_t seq,
868 u32 abort_code, int error)
869 {
870 trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq,
871 abort_code, error);
872 return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED,
873 abort_code, error);
874 }
875
876 static inline bool rxrpc_abort_call(const char *why, struct rxrpc_call *call,
877 rxrpc_seq_t seq, u32 abort_code, int error)
878 {
879 bool ret;
880
881 write_lock_bh(&call->state_lock);
882 ret = __rxrpc_abort_call(why, call, seq, abort_code, error);
883 write_unlock_bh(&call->state_lock);
884 return ret;
885 }
886
887 /*
888 * Abort a call due to a protocol error.
889 */
890 static inline bool __rxrpc_abort_eproto(struct rxrpc_call *call,
891 struct sk_buff *skb,
892 const char *eproto_why,
893 const char *why,
894 u32 abort_code)
895 {
896 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
897
898 trace_rxrpc_rx_eproto(call, sp->hdr.serial, eproto_why);
899 return rxrpc_abort_call(why, call, sp->hdr.seq, abort_code, -EPROTO);
900 }
901
902 #define rxrpc_abort_eproto(call, skb, eproto_why, abort_why, abort_code) \
903 __rxrpc_abort_eproto((call), (skb), tracepoint_string(eproto_why), \
904 (abort_why), (abort_code))
905
906 /*
907 * conn_client.c
908 */
909 extern unsigned int rxrpc_max_client_connections;
910 extern unsigned int rxrpc_reap_client_connections;
911 extern unsigned long rxrpc_conn_idle_client_expiry;
912 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
913 extern struct idr rxrpc_client_conn_ids;
914
915 void rxrpc_destroy_client_conn_ids(void);
916 int rxrpc_connect_call(struct rxrpc_sock *, struct rxrpc_call *,
917 struct rxrpc_conn_parameters *, struct sockaddr_rxrpc *,
918 gfp_t);
919 void rxrpc_expose_client_call(struct rxrpc_call *);
920 void rxrpc_disconnect_client_call(struct rxrpc_call *);
921 void rxrpc_put_client_conn(struct rxrpc_connection *);
922 void rxrpc_discard_expired_client_conns(struct work_struct *);
923 void rxrpc_destroy_all_client_connections(struct rxrpc_net *);
924 void rxrpc_clean_up_local_conns(struct rxrpc_local *);
925
926 /*
927 * conn_event.c
928 */
929 void rxrpc_process_connection(struct work_struct *);
930
931 /*
932 * conn_object.c
933 */
934 extern unsigned int rxrpc_connection_expiry;
935 extern unsigned int rxrpc_closed_conn_expiry;
936
937 struct rxrpc_connection *rxrpc_alloc_connection(gfp_t);
938 struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *,
939 struct sk_buff *,
940 struct rxrpc_peer **);
941 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
942 void rxrpc_disconnect_call(struct rxrpc_call *);
943 void rxrpc_kill_connection(struct rxrpc_connection *);
944 bool rxrpc_queue_conn(struct rxrpc_connection *);
945 void rxrpc_see_connection(struct rxrpc_connection *);
946 void rxrpc_get_connection(struct rxrpc_connection *);
947 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *);
948 void rxrpc_put_service_conn(struct rxrpc_connection *);
949 void rxrpc_service_connection_reaper(struct work_struct *);
950 void rxrpc_destroy_all_connections(struct rxrpc_net *);
951
952 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
953 {
954 return conn->out_clientflag;
955 }
956
957 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
958 {
959 return !rxrpc_conn_is_client(conn);
960 }
961
962 static inline void rxrpc_put_connection(struct rxrpc_connection *conn)
963 {
964 if (!conn)
965 return;
966
967 if (rxrpc_conn_is_client(conn))
968 rxrpc_put_client_conn(conn);
969 else
970 rxrpc_put_service_conn(conn);
971 }
972
973 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
974 unsigned long expire_at)
975 {
976 timer_reduce(&conn->timer, expire_at);
977 }
978
979 /*
980 * conn_service.c
981 */
982 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
983 struct sk_buff *);
984 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
985 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *,
986 const struct rxrpc_security *, struct key *,
987 struct sk_buff *);
988 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
989
990 /*
991 * input.c
992 */
993 int rxrpc_input_packet(struct sock *, struct sk_buff *);
994
995 /*
996 * insecure.c
997 */
998 extern const struct rxrpc_security rxrpc_no_security;
999
1000 /*
1001 * key.c
1002 */
1003 extern struct key_type key_type_rxrpc;
1004 extern struct key_type key_type_rxrpc_s;
1005
1006 int rxrpc_request_key(struct rxrpc_sock *, char __user *, int);
1007 int rxrpc_server_keyring(struct rxrpc_sock *, char __user *, int);
1008 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
1009 u32);
1010
1011 /*
1012 * local_event.c
1013 */
1014 extern void rxrpc_process_local_events(struct rxrpc_local *);
1015
1016 /*
1017 * local_object.c
1018 */
1019 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1020 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *);
1021 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *);
1022 void rxrpc_put_local(struct rxrpc_local *);
1023 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *);
1024 void rxrpc_unuse_local(struct rxrpc_local *);
1025 void rxrpc_queue_local(struct rxrpc_local *);
1026 void rxrpc_destroy_all_locals(struct rxrpc_net *);
1027
1028 static inline bool __rxrpc_unuse_local(struct rxrpc_local *local)
1029 {
1030 return atomic_dec_return(&local->active_users) == 0;
1031 }
1032
1033 static inline bool __rxrpc_use_local(struct rxrpc_local *local)
1034 {
1035 return atomic_fetch_add_unless(&local->active_users, 1, 0) != 0;
1036 }
1037
1038 /*
1039 * misc.c
1040 */
1041 extern unsigned int rxrpc_max_backlog __read_mostly;
1042 extern unsigned long rxrpc_requested_ack_delay;
1043 extern unsigned long rxrpc_soft_ack_delay;
1044 extern unsigned long rxrpc_idle_ack_delay;
1045 extern unsigned int rxrpc_rx_window_size;
1046 extern unsigned int rxrpc_rx_mtu;
1047 extern unsigned int rxrpc_rx_jumbo_max;
1048
1049 extern const s8 rxrpc_ack_priority[];
1050
1051 /*
1052 * net_ns.c
1053 */
1054 extern unsigned int rxrpc_net_id;
1055 extern struct pernet_operations rxrpc_net_ops;
1056
1057 static inline struct rxrpc_net *rxrpc_net(struct net *net)
1058 {
1059 return net_generic(net, rxrpc_net_id);
1060 }
1061
1062 /*
1063 * output.c
1064 */
1065 int rxrpc_send_ack_packet(struct rxrpc_call *, bool, rxrpc_serial_t *);
1066 int rxrpc_send_abort_packet(struct rxrpc_call *);
1067 int rxrpc_send_data_packet(struct rxrpc_call *, struct sk_buff *, bool);
1068 void rxrpc_reject_packets(struct rxrpc_local *);
1069 void rxrpc_send_keepalive(struct rxrpc_peer *);
1070
1071 /*
1072 * peer_event.c
1073 */
1074 void rxrpc_error_report(struct sock *);
1075 void rxrpc_peer_keepalive_worker(struct work_struct *);
1076
1077 /*
1078 * peer_object.c
1079 */
1080 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1081 const struct sockaddr_rxrpc *);
1082 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *, struct rxrpc_local *,
1083 struct sockaddr_rxrpc *, gfp_t);
1084 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t);
1085 void rxrpc_new_incoming_peer(struct rxrpc_sock *, struct rxrpc_local *,
1086 struct rxrpc_peer *);
1087 void rxrpc_destroy_all_peers(struct rxrpc_net *);
1088 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *);
1089 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *);
1090 void rxrpc_put_peer(struct rxrpc_peer *);
1091 void rxrpc_put_peer_locked(struct rxrpc_peer *);
1092
1093 /*
1094 * proc.c
1095 */
1096 extern const struct seq_operations rxrpc_call_seq_ops;
1097 extern const struct seq_operations rxrpc_connection_seq_ops;
1098 extern const struct seq_operations rxrpc_peer_seq_ops;
1099
1100 /*
1101 * recvmsg.c
1102 */
1103 void rxrpc_notify_socket(struct rxrpc_call *);
1104 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1105
1106 /*
1107 * rtt.c
1108 */
1109 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace,
1110 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1111 unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool);
1112 void rxrpc_peer_init_rtt(struct rxrpc_peer *);
1113
1114 /*
1115 * rxkad.c
1116 */
1117 #ifdef CONFIG_RXKAD
1118 extern const struct rxrpc_security rxkad;
1119 #endif
1120
1121 /*
1122 * security.c
1123 */
1124 int __init rxrpc_init_security(void);
1125 void rxrpc_exit_security(void);
1126 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1127 bool rxrpc_look_up_server_security(struct rxrpc_local *, struct rxrpc_sock *,
1128 const struct rxrpc_security **, struct key **,
1129 struct sk_buff *);
1130
1131 /*
1132 * sendmsg.c
1133 */
1134 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1135
1136 /*
1137 * skbuff.c
1138 */
1139 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1140 void rxrpc_packet_destructor(struct sk_buff *);
1141 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1142 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1143 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
1144 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1145 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1146 void rxrpc_purge_queue(struct sk_buff_head *);
1147
1148 /*
1149 * sysctl.c
1150 */
1151 #ifdef CONFIG_SYSCTL
1152 extern int __init rxrpc_sysctl_init(void);
1153 extern void rxrpc_sysctl_exit(void);
1154 #else
1155 static inline int __init rxrpc_sysctl_init(void) { return 0; }
1156 static inline void rxrpc_sysctl_exit(void) {}
1157 #endif
1158
1159 /*
1160 * utils.c
1161 */
1162 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1163
1164 static inline bool before(u32 seq1, u32 seq2)
1165 {
1166 return (s32)(seq1 - seq2) < 0;
1167 }
1168 static inline bool before_eq(u32 seq1, u32 seq2)
1169 {
1170 return (s32)(seq1 - seq2) <= 0;
1171 }
1172 static inline bool after(u32 seq1, u32 seq2)
1173 {
1174 return (s32)(seq1 - seq2) > 0;
1175 }
1176 static inline bool after_eq(u32 seq1, u32 seq2)
1177 {
1178 return (s32)(seq1 - seq2) >= 0;
1179 }
1180
1181 /*
1182 * debug tracing
1183 */
1184 extern unsigned int rxrpc_debug;
1185
1186 #define dbgprintk(FMT,...) \
1187 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1188
1189 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1190 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1191 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1192 #define kproto(FMT,...) dbgprintk("### "FMT ,##__VA_ARGS__)
1193 #define knet(FMT,...) dbgprintk("@@@ "FMT ,##__VA_ARGS__)
1194
1195
1196 #if defined(__KDEBUG)
1197 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1198 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1199 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1200 #define _proto(FMT,...) kproto(FMT,##__VA_ARGS__)
1201 #define _net(FMT,...) knet(FMT,##__VA_ARGS__)
1202
1203 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1204 #define RXRPC_DEBUG_KENTER 0x01
1205 #define RXRPC_DEBUG_KLEAVE 0x02
1206 #define RXRPC_DEBUG_KDEBUG 0x04
1207 #define RXRPC_DEBUG_KPROTO 0x08
1208 #define RXRPC_DEBUG_KNET 0x10
1209
1210 #define _enter(FMT,...) \
1211 do { \
1212 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1213 kenter(FMT,##__VA_ARGS__); \
1214 } while (0)
1215
1216 #define _leave(FMT,...) \
1217 do { \
1218 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1219 kleave(FMT,##__VA_ARGS__); \
1220 } while (0)
1221
1222 #define _debug(FMT,...) \
1223 do { \
1224 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1225 kdebug(FMT,##__VA_ARGS__); \
1226 } while (0)
1227
1228 #define _proto(FMT,...) \
1229 do { \
1230 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KPROTO)) \
1231 kproto(FMT,##__VA_ARGS__); \
1232 } while (0)
1233
1234 #define _net(FMT,...) \
1235 do { \
1236 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KNET)) \
1237 knet(FMT,##__VA_ARGS__); \
1238 } while (0)
1239
1240 #else
1241 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1242 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1243 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1244 #define _proto(FMT,...) no_printk("### "FMT ,##__VA_ARGS__)
1245 #define _net(FMT,...) no_printk("@@@ "FMT ,##__VA_ARGS__)
1246 #endif
1247
1248 /*
1249 * debug assertion checking
1250 */
1251 #if 1 // defined(__KDEBUGALL)
1252
1253 #define ASSERT(X) \
1254 do { \
1255 if (unlikely(!(X))) { \
1256 pr_err("Assertion failed\n"); \
1257 BUG(); \
1258 } \
1259 } while (0)
1260
1261 #define ASSERTCMP(X, OP, Y) \
1262 do { \
1263 __typeof__(X) _x = (X); \
1264 __typeof__(Y) _y = (__typeof__(X))(Y); \
1265 if (unlikely(!(_x OP _y))) { \
1266 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1267 (unsigned long)_x, (unsigned long)_x, #OP, \
1268 (unsigned long)_y, (unsigned long)_y); \
1269 BUG(); \
1270 } \
1271 } while (0)
1272
1273 #define ASSERTIF(C, X) \
1274 do { \
1275 if (unlikely((C) && !(X))) { \
1276 pr_err("Assertion failed\n"); \
1277 BUG(); \
1278 } \
1279 } while (0)
1280
1281 #define ASSERTIFCMP(C, X, OP, Y) \
1282 do { \
1283 __typeof__(X) _x = (X); \
1284 __typeof__(Y) _y = (__typeof__(X))(Y); \
1285 if (unlikely((C) && !(_x OP _y))) { \
1286 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1287 (unsigned long)_x, (unsigned long)_x, #OP, \
1288 (unsigned long)_y, (unsigned long)_y); \
1289 BUG(); \
1290 } \
1291 } while (0)
1292
1293 #else
1294
1295 #define ASSERT(X) \
1296 do { \
1297 } while (0)
1298
1299 #define ASSERTCMP(X, OP, Y) \
1300 do { \
1301 } while (0)
1302
1303 #define ASSERTIF(C, X) \
1304 do { \
1305 } while (0)
1306
1307 #define ASSERTIFCMP(C, X, OP, Y) \
1308 do { \
1309 } while (0)
1310
1311 #endif /* __KDEBUGALL */
Linux with added FPC-III support