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 <keys/rxrpc-type.h>
16 #include "protocol.h"
17
18 #define FCRYPT_BSIZE 8
19 struct rxrpc_crypt {
20 union {
21 u8 x[FCRYPT_BSIZE];
22 __be32 n[2];
23 };
24 } __attribute__((aligned(8)));
25
26 #define rxrpc_queue_work(WS) queue_work(rxrpc_workqueue, (WS))
27 #define rxrpc_queue_delayed_work(WS,D) \
28 queue_delayed_work(rxrpc_workqueue, (WS), (D))
29
30 struct key_preparsed_payload;
31 struct rxrpc_connection;
32 struct rxrpc_txbuf;
33
34 /*
35 * Mark applied to socket buffers in skb->mark. skb->priority is used
36 * to pass supplementary information.
37 */
38 enum rxrpc_skb_mark {
39 RXRPC_SKB_MARK_PACKET, /* Received packet */
40 RXRPC_SKB_MARK_ERROR, /* Error notification */
41 RXRPC_SKB_MARK_SERVICE_CONN_SECURED, /* Service connection response has been verified */
42 RXRPC_SKB_MARK_REJECT_BUSY, /* Reject with BUSY */
43 RXRPC_SKB_MARK_REJECT_ABORT, /* Reject with ABORT (code in skb->priority) */
44 };
45
46 /*
47 * sk_state for RxRPC sockets
48 */
49 enum {
50 RXRPC_UNBOUND = 0,
51 RXRPC_CLIENT_UNBOUND, /* Unbound socket used as client */
52 RXRPC_CLIENT_BOUND, /* client local address bound */
53 RXRPC_SERVER_BOUND, /* server local address bound */
54 RXRPC_SERVER_BOUND2, /* second server local address bound */
55 RXRPC_SERVER_LISTENING, /* server listening for connections */
56 RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */
57 RXRPC_CLOSE, /* socket is being closed */
58 };
59
60 /*
61 * Per-network namespace data.
62 */
63 struct rxrpc_net {
64 struct proc_dir_entry *proc_net; /* Subdir in /proc/net */
65 u32 epoch; /* Local epoch for detecting local-end reset */
66 struct list_head calls; /* List of calls active in this namespace */
67 spinlock_t call_lock; /* Lock for ->calls */
68 atomic_t nr_calls; /* Count of allocated calls */
69
70 atomic_t nr_conns;
71 struct list_head conn_proc_list; /* List of conns in this namespace for proc */
72 struct list_head service_conns; /* Service conns in this namespace */
73 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */
74 struct work_struct service_conn_reaper;
75 struct timer_list service_conn_reap_timer;
76
77 bool live;
78
79 atomic_t nr_client_conns;
80
81 struct hlist_head local_endpoints;
82 struct mutex local_mutex; /* Lock for ->local_endpoints */
83
84 DECLARE_HASHTABLE (peer_hash, 10);
85 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */
86
87 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
88 u8 peer_keepalive_cursor;
89 time64_t peer_keepalive_base;
90 struct list_head peer_keepalive[32];
91 struct list_head peer_keepalive_new;
92 struct timer_list peer_keepalive_timer;
93 struct work_struct peer_keepalive_work;
94
95 atomic_t stat_tx_data;
96 atomic_t stat_tx_data_retrans;
97 atomic_t stat_tx_data_send;
98 atomic_t stat_tx_data_send_frag;
99 atomic_t stat_tx_data_send_fail;
100 atomic_t stat_tx_data_underflow;
101 atomic_t stat_tx_data_cwnd_reset;
102 atomic_t stat_rx_data;
103 atomic_t stat_rx_data_reqack;
104 atomic_t stat_rx_data_jumbo;
105
106 atomic_t stat_tx_ack_fill;
107 atomic_t stat_tx_ack_send;
108 atomic_t stat_tx_ack_skip;
109 atomic_t stat_tx_acks[256];
110 atomic_t stat_rx_acks[256];
111
112 atomic_t stat_why_req_ack[8];
113
114 atomic_t stat_io_loop;
115 };
116
117 /*
118 * Service backlog preallocation.
119 *
120 * This contains circular buffers of preallocated peers, connections and calls
121 * for incoming service calls and their head and tail pointers. This allows
122 * calls to be set up in the data_ready handler, thereby avoiding the need to
123 * shuffle packets around so much.
124 */
125 struct rxrpc_backlog {
126 unsigned short peer_backlog_head;
127 unsigned short peer_backlog_tail;
128 unsigned short conn_backlog_head;
129 unsigned short conn_backlog_tail;
130 unsigned short call_backlog_head;
131 unsigned short call_backlog_tail;
132 #define RXRPC_BACKLOG_MAX 32
133 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX];
134 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
135 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX];
136 };
137
138 /*
139 * RxRPC socket definition
140 */
141 struct rxrpc_sock {
142 /* WARNING: sk has to be the first member */
143 struct sock sk;
144 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
145 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
146 struct rxrpc_local *local; /* local endpoint */
147 struct rxrpc_backlog *backlog; /* Preallocation for services */
148 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */
149 struct list_head sock_calls; /* List of calls owned by this socket */
150 struct list_head to_be_accepted; /* calls awaiting acceptance */
151 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */
152 spinlock_t recvmsg_lock; /* Lock for recvmsg_q */
153 struct key *key; /* security for this socket */
154 struct key *securities; /* list of server security descriptors */
155 struct rb_root calls; /* User ID -> call mapping */
156 unsigned long flags;
157 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */
158 rwlock_t call_lock; /* lock for calls */
159 u32 min_sec_level; /* minimum security level */
160 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT
161 bool exclusive; /* Exclusive connection for a client socket */
162 u16 second_service; /* Additional service bound to the endpoint */
163 struct {
164 /* Service upgrade information */
165 u16 from; /* Service ID to upgrade (if not 0) */
166 u16 to; /* service ID to upgrade to */
167 } service_upgrade;
168 sa_family_t family; /* Protocol family created with */
169 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */
170 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */
171 };
172
173 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
174
175 /*
176 * CPU-byteorder normalised Rx packet header.
177 */
178 struct rxrpc_host_header {
179 u32 epoch; /* client boot timestamp */
180 u32 cid; /* connection and channel ID */
181 u32 callNumber; /* call ID (0 for connection-level packets) */
182 u32 seq; /* sequence number of pkt in call stream */
183 u32 serial; /* serial number of pkt sent to network */
184 u8 type; /* packet type */
185 u8 flags; /* packet flags */
186 u8 userStatus; /* app-layer defined status */
187 u8 securityIndex; /* security protocol ID */
188 union {
189 u16 _rsvd; /* reserved */
190 u16 cksum; /* kerberos security checksum */
191 };
192 u16 serviceId; /* service ID */
193 } __packed;
194
195 /*
196 * RxRPC socket buffer private variables
197 * - max 48 bytes (struct sk_buff::cb)
198 */
199 struct rxrpc_skb_priv {
200 struct rxrpc_connection *conn; /* Connection referred to (poke packet) */
201 union {
202 struct {
203 u16 offset; /* Offset of data */
204 u16 len; /* Length of data */
205 u8 flags;
206 #define RXRPC_RX_VERIFIED 0x01
207 };
208 struct {
209 rxrpc_seq_t first_ack; /* First packet in acks table */
210 u8 nr_acks; /* Number of acks+nacks */
211 u8 nr_nacks; /* Number of nacks */
212 };
213 };
214 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */
215 };
216
217 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
218
219 /*
220 * RxRPC security module interface
221 */
222 struct rxrpc_security {
223 const char *name; /* name of this service */
224 u8 security_index; /* security type provided */
225 u32 no_key_abort; /* Abort code indicating no key */
226
227 /* Initialise a security service */
228 int (*init)(void);
229
230 /* Clean up a security service */
231 void (*exit)(void);
232
233 /* Parse the information from a server key */
234 int (*preparse_server_key)(struct key_preparsed_payload *);
235
236 /* Clean up the preparse buffer after parsing a server key */
237 void (*free_preparse_server_key)(struct key_preparsed_payload *);
238
239 /* Destroy the payload of a server key */
240 void (*destroy_server_key)(struct key *);
241
242 /* Describe a server key */
243 void (*describe_server_key)(const struct key *, struct seq_file *);
244
245 /* initialise a connection's security */
246 int (*init_connection_security)(struct rxrpc_connection *,
247 struct rxrpc_key_token *);
248
249 /* Work out how much data we can store in a packet, given an estimate
250 * of the amount of data remaining.
251 */
252 int (*how_much_data)(struct rxrpc_call *, size_t,
253 size_t *, size_t *, size_t *);
254
255 /* impose security on a packet */
256 int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *);
257
258 /* verify the security on a received packet */
259 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *);
260
261 /* Free crypto request on a call */
262 void (*free_call_crypto)(struct rxrpc_call *);
263
264 /* issue a challenge */
265 int (*issue_challenge)(struct rxrpc_connection *);
266
267 /* respond to a challenge */
268 int (*respond_to_challenge)(struct rxrpc_connection *,
269 struct sk_buff *);
270
271 /* verify a response */
272 int (*verify_response)(struct rxrpc_connection *,
273 struct sk_buff *);
274
275 /* clear connection security */
276 void (*clear)(struct rxrpc_connection *);
277 };
278
279 /*
280 * RxRPC local transport endpoint description
281 * - owned by a single AF_RXRPC socket
282 * - pointed to by transport socket struct sk_user_data
283 */
284 struct rxrpc_local {
285 struct rcu_head rcu;
286 atomic_t active_users; /* Number of users of the local endpoint */
287 refcount_t ref; /* Number of references to the structure */
288 struct net *net; /* The network namespace */
289 struct rxrpc_net *rxnet; /* Our bits in the network namespace */
290 struct hlist_node link;
291 struct socket *socket; /* my UDP socket */
292 struct task_struct *io_thread;
293 struct completion io_thread_ready; /* Indication that the I/O thread started */
294 struct rxrpc_sock *service; /* Service(s) listening on this endpoint */
295 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
296 struct sk_buff_head rx_delay_queue; /* Delay injection queue */
297 #endif
298 struct sk_buff_head rx_queue; /* Received packets */
299 struct list_head conn_attend_q; /* Conns requiring immediate attention */
300 struct list_head call_attend_q; /* Calls requiring immediate attention */
301
302 struct rb_root client_bundles; /* Client connection bundles by socket params */
303 spinlock_t client_bundles_lock; /* Lock for client_bundles */
304 bool kill_all_client_conns;
305 struct list_head idle_client_conns;
306 struct timer_list client_conn_reap_timer;
307 unsigned long client_conn_flags;
308 #define RXRPC_CLIENT_CONN_REAP_TIMER 0 /* The client conn reap timer expired */
309
310 spinlock_t lock; /* access lock */
311 rwlock_t services_lock; /* lock for services list */
312 int debug_id; /* debug ID for printks */
313 bool dead;
314 bool service_closed; /* Service socket closed */
315 struct idr conn_ids; /* List of connection IDs */
316 struct list_head new_client_calls; /* Newly created client calls need connection */
317 spinlock_t client_call_lock; /* Lock for ->new_client_calls */
318 struct sockaddr_rxrpc srx; /* local address */
319 };
320
321 /*
322 * RxRPC remote transport endpoint definition
323 * - matched by local endpoint, remote port, address and protocol type
324 */
325 struct rxrpc_peer {
326 struct rcu_head rcu; /* This must be first */
327 refcount_t ref;
328 unsigned long hash_key;
329 struct hlist_node hash_link;
330 struct rxrpc_local *local;
331 struct hlist_head error_targets; /* targets for net error distribution */
332 struct rb_root service_conns; /* Service connections */
333 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */
334 time64_t last_tx_at; /* Last time packet sent here */
335 seqlock_t service_conn_lock;
336 spinlock_t lock; /* access lock */
337 unsigned int if_mtu; /* interface MTU for this peer */
338 unsigned int mtu; /* network MTU for this peer */
339 unsigned int maxdata; /* data size (MTU - hdrsize) */
340 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */
341 int debug_id; /* debug ID for printks */
342 struct sockaddr_rxrpc srx; /* remote address */
343
344 /* calculated RTT cache */
345 #define RXRPC_RTT_CACHE_SIZE 32
346 spinlock_t rtt_input_lock; /* RTT lock for input routine */
347 ktime_t rtt_last_req; /* Time of last RTT request */
348 unsigned int rtt_count; /* Number of samples we've got */
349
350 u32 srtt_us; /* smoothed round trip time << 3 in usecs */
351 u32 mdev_us; /* medium deviation */
352 u32 mdev_max_us; /* maximal mdev for the last rtt period */
353 u32 rttvar_us; /* smoothed mdev_max */
354 u32 rto_j; /* Retransmission timeout in jiffies */
355 u8 backoff; /* Backoff timeout */
356
357 u8 cong_ssthresh; /* Congestion slow-start threshold */
358 };
359
360 /*
361 * Keys for matching a connection.
362 */
363 struct rxrpc_conn_proto {
364 union {
365 struct {
366 u32 epoch; /* epoch of this connection */
367 u32 cid; /* connection ID */
368 };
369 u64 index_key;
370 };
371 };
372
373 struct rxrpc_conn_parameters {
374 struct rxrpc_local *local; /* Representation of local endpoint */
375 struct key *key; /* Security details */
376 bool exclusive; /* T if conn is exclusive */
377 bool upgrade; /* T if service ID can be upgraded */
378 u16 service_id; /* Service ID for this connection */
379 u32 security_level; /* Security level selected */
380 };
381
382 /*
383 * Call completion condition (state == RXRPC_CALL_COMPLETE).
384 */
385 enum rxrpc_call_completion {
386 RXRPC_CALL_SUCCEEDED, /* - Normal termination */
387 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */
388 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */
389 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */
390 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */
391 NR__RXRPC_CALL_COMPLETIONS
392 };
393
394 /*
395 * Bits in the connection flags.
396 */
397 enum rxrpc_conn_flag {
398 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */
399 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */
400 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
401 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */
402 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */
403 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */
404 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */
405 };
406
407 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \
408 (1UL << RXRPC_CONN_FINAL_ACK_1) | \
409 (1UL << RXRPC_CONN_FINAL_ACK_2) | \
410 (1UL << RXRPC_CONN_FINAL_ACK_3))
411
412 /*
413 * Events that can be raised upon a connection.
414 */
415 enum rxrpc_conn_event {
416 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */
417 RXRPC_CONN_EV_ABORT_CALLS, /* Abort attached calls */
418 };
419
420 /*
421 * The connection protocol state.
422 */
423 enum rxrpc_conn_proto_state {
424 RXRPC_CONN_UNUSED, /* Connection not yet attempted */
425 RXRPC_CONN_CLIENT_UNSECURED, /* Client connection needs security init */
426 RXRPC_CONN_CLIENT, /* Client connection */
427 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */
428 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */
429 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
430 RXRPC_CONN_SERVICE, /* Service secured connection */
431 RXRPC_CONN_ABORTED, /* Conn aborted */
432 RXRPC_CONN__NR_STATES
433 };
434
435 /*
436 * RxRPC client connection bundle.
437 */
438 struct rxrpc_bundle {
439 struct rxrpc_local *local; /* Representation of local endpoint */
440 struct rxrpc_peer *peer; /* Remote endpoint */
441 struct key *key; /* Security details */
442 const struct rxrpc_security *security; /* applied security module */
443 refcount_t ref;
444 atomic_t active; /* Number of active users */
445 unsigned int debug_id;
446 u32 security_level; /* Security level selected */
447 u16 service_id; /* Service ID for this connection */
448 bool try_upgrade; /* True if the bundle is attempting upgrade */
449 bool exclusive; /* T if conn is exclusive */
450 bool upgrade; /* T if service ID can be upgraded */
451 unsigned short alloc_error; /* Error from last conn allocation */
452 struct rb_node local_node; /* Node in local->client_conns */
453 struct list_head waiting_calls; /* Calls waiting for channels */
454 unsigned long avail_chans; /* Mask of available channels */
455 struct rxrpc_connection *conns[4]; /* The connections in the bundle (max 4) */
456 };
457
458 /*
459 * RxRPC connection definition
460 * - matched by { local, peer, epoch, conn_id, direction }
461 * - each connection can only handle four simultaneous calls
462 */
463 struct rxrpc_connection {
464 struct rxrpc_conn_proto proto;
465 struct rxrpc_local *local; /* Representation of local endpoint */
466 struct rxrpc_peer *peer; /* Remote endpoint */
467 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */
468 struct key *key; /* Security details */
469 struct list_head attend_link; /* Link in local->conn_attend_q */
470
471 refcount_t ref;
472 atomic_t active; /* Active count for service conns */
473 struct rcu_head rcu;
474 struct list_head cache_link;
475
476 unsigned char act_chans; /* Mask of active channels */
477 struct rxrpc_channel {
478 unsigned long final_ack_at; /* Time at which to issue final ACK */
479 struct rxrpc_call *call; /* Active call */
480 unsigned int call_debug_id; /* call->debug_id */
481 u32 call_id; /* ID of current call */
482 u32 call_counter; /* Call ID counter */
483 u32 last_call; /* ID of last call */
484 u8 last_type; /* Type of last packet */
485 union {
486 u32 last_seq;
487 u32 last_abort;
488 };
489 } channels[RXRPC_MAXCALLS];
490
491 struct timer_list timer; /* Conn event timer */
492 struct work_struct processor; /* connection event processor */
493 struct work_struct destructor; /* In-process-context destroyer */
494 struct rxrpc_bundle *bundle; /* Client connection bundle */
495 struct rb_node service_node; /* Node in peer->service_conns */
496 struct list_head proc_link; /* link in procfs list */
497 struct list_head link; /* link in master connection list */
498 struct sk_buff_head rx_queue; /* received conn-level packets */
499
500 struct mutex security_lock; /* Lock for security management */
501 const struct rxrpc_security *security; /* applied security module */
502 union {
503 struct {
504 struct crypto_sync_skcipher *cipher; /* encryption handle */
505 struct rxrpc_crypt csum_iv; /* packet checksum base */
506 u32 nonce; /* response re-use preventer */
507 } rxkad;
508 };
509 unsigned long flags;
510 unsigned long events;
511 unsigned long idle_timestamp; /* Time at which last became idle */
512 spinlock_t state_lock; /* state-change lock */
513 enum rxrpc_conn_proto_state state; /* current state of connection */
514 enum rxrpc_call_completion completion; /* Completion condition */
515 s32 abort_code; /* Abort code of connection abort */
516 int debug_id; /* debug ID for printks */
517 rxrpc_serial_t tx_serial; /* Outgoing packet serial number counter */
518 unsigned int hi_serial; /* highest serial number received */
519 u32 service_id; /* Service ID, possibly upgraded */
520 u32 security_level; /* Security level selected */
521 u8 security_ix; /* security type */
522 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
523 u8 bundle_shift; /* Index into bundle->avail_chans */
524 bool exclusive; /* T if conn is exclusive */
525 bool upgrade; /* T if service ID can be upgraded */
526 u16 orig_service_id; /* Originally requested service ID */
527 short error; /* Local error code */
528 };
529
rxrpc_to_server(const struct rxrpc_skb_priv * sp)530 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
531 {
532 return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
533 }
534
rxrpc_to_client(const struct rxrpc_skb_priv * sp)535 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
536 {
537 return !rxrpc_to_server(sp);
538 }
539
540 /*
541 * Flags in call->flags.
542 */
543 enum rxrpc_call_flag {
544 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */
545 RXRPC_CALL_HAS_USERID, /* has a user ID attached */
546 RXRPC_CALL_IS_SERVICE, /* Call is service call */
547 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */
548 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */
549 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */
550 RXRPC_CALL_TX_ALL_ACKED, /* Last packet has been hard-acked */
551 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */
552 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */
553 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */
554 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */
555 RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */
556 RXRPC_CALL_KERNEL, /* The call was made by the kernel */
557 RXRPC_CALL_UPGRADE, /* Service upgrade was requested for the call */
558 RXRPC_CALL_EXCLUSIVE, /* The call uses a once-only connection */
559 RXRPC_CALL_RX_IS_IDLE, /* recvmsg() is idle - send an ACK */
560 RXRPC_CALL_RECVMSG_READ_ALL, /* recvmsg() read all of the received data */
561 };
562
563 /*
564 * Events that can be raised on a call.
565 */
566 enum rxrpc_call_event {
567 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */
568 RXRPC_CALL_EV_INITIAL_PING, /* Send initial ping for a new service call */
569 };
570
571 /*
572 * The states that a call can be in.
573 */
574 enum rxrpc_call_state {
575 RXRPC_CALL_UNINITIALISED,
576 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */
577 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
578 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */
579 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */
580 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */
581 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */
582 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
583 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */
584 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */
585 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */
586 RXRPC_CALL_COMPLETE, /* - call complete */
587 NR__RXRPC_CALL_STATES
588 };
589
590 /*
591 * Call Tx congestion management modes.
592 */
593 enum rxrpc_congest_mode {
594 RXRPC_CALL_SLOW_START,
595 RXRPC_CALL_CONGEST_AVOIDANCE,
596 RXRPC_CALL_PACKET_LOSS,
597 RXRPC_CALL_FAST_RETRANSMIT,
598 NR__RXRPC_CONGEST_MODES
599 };
600
601 /*
602 * RxRPC call definition
603 * - matched by { connection, call_id }
604 */
605 struct rxrpc_call {
606 struct rcu_head rcu;
607 struct rxrpc_connection *conn; /* connection carrying call */
608 struct rxrpc_bundle *bundle; /* Connection bundle to use */
609 struct rxrpc_peer *peer; /* Peer record for remote address */
610 struct rxrpc_local *local; /* Representation of local endpoint */
611 struct rxrpc_sock __rcu *socket; /* socket responsible */
612 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */
613 struct key *key; /* Security details */
614 const struct rxrpc_security *security; /* applied security module */
615 struct mutex user_mutex; /* User access mutex */
616 struct sockaddr_rxrpc dest_srx; /* Destination address */
617 unsigned long delay_ack_at; /* When DELAY ACK needs to happen */
618 unsigned long ack_lost_at; /* When ACK is figured as lost */
619 unsigned long resend_at; /* When next resend needs to happen */
620 unsigned long ping_at; /* When next to send a ping */
621 unsigned long keepalive_at; /* When next to send a keepalive ping */
622 unsigned long expect_rx_by; /* When we expect to get a packet by */
623 unsigned long expect_req_by; /* When we expect to get a request DATA packet by */
624 unsigned long expect_term_by; /* When we expect call termination by */
625 u32 next_rx_timo; /* Timeout for next Rx packet (jif) */
626 u32 next_req_timo; /* Timeout for next Rx request packet (jif) */
627 u32 hard_timo; /* Maximum lifetime or 0 (jif) */
628 struct timer_list timer; /* Combined event timer */
629 struct work_struct destroyer; /* In-process-context destroyer */
630 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */
631 struct list_head link; /* link in master call list */
632 struct list_head wait_link; /* Link in local->new_client_calls */
633 struct hlist_node error_link; /* link in error distribution list */
634 struct list_head accept_link; /* Link in rx->acceptq */
635 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */
636 struct list_head sock_link; /* Link in rx->sock_calls */
637 struct rb_node sock_node; /* Node in rx->calls */
638 struct list_head attend_link; /* Link in local->call_attend_q */
639 struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */
640 wait_queue_head_t waitq; /* Wait queue for channel or Tx */
641 s64 tx_total_len; /* Total length left to be transmitted (or -1) */
642 unsigned long user_call_ID; /* user-defined call ID */
643 unsigned long flags;
644 unsigned long events;
645 spinlock_t notify_lock; /* Kernel notification lock */
646 unsigned int send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */
647 s32 send_abort; /* Abort code to be sent */
648 short send_abort_err; /* Error to be associated with the abort */
649 rxrpc_seq_t send_abort_seq; /* DATA packet that incurred the abort (or 0) */
650 s32 abort_code; /* Local/remote abort code */
651 int error; /* Local error incurred */
652 enum rxrpc_call_state _state; /* Current state of call (needs barrier) */
653 enum rxrpc_call_completion completion; /* Call completion condition */
654 refcount_t ref;
655 u8 security_ix; /* Security type */
656 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */
657 u32 call_id; /* call ID on connection */
658 u32 cid; /* connection ID plus channel index */
659 u32 security_level; /* Security level selected */
660 int debug_id; /* debug ID for printks */
661 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */
662 unsigned short rx_pkt_len; /* Current recvmsg packet len */
663
664 /* Transmitted data tracking. */
665 spinlock_t tx_lock; /* Transmit queue lock */
666 struct list_head tx_sendmsg; /* Sendmsg prepared packets */
667 struct list_head tx_buffer; /* Buffer of transmissible packets */
668 rxrpc_seq_t tx_bottom; /* First packet in buffer */
669 rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */
670 rxrpc_seq_t tx_prepared; /* Highest Tx slot prepared. */
671 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */
672 u16 tx_backoff; /* Delay to insert due to Tx failure */
673 u8 tx_winsize; /* Maximum size of Tx window */
674 #define RXRPC_TX_MAX_WINDOW 128
675 ktime_t tx_last_sent; /* Last time a transmission occurred */
676
677 /* Received data tracking */
678 struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */
679 struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */
680
681 rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */
682 rxrpc_seq_t rx_consumed; /* Highest packet consumed */
683 rxrpc_serial_t rx_serial; /* Highest serial received for this call */
684 u8 rx_winsize; /* Size of Rx window */
685
686 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS
687 * is fixed, we keep these numbers in terms of segments (ie. DATA
688 * packets) rather than bytes.
689 */
690 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN
691 #define RXRPC_MIN_CWND 4
692 u8 cong_cwnd; /* Congestion window size */
693 u8 cong_extra; /* Extra to send for congestion management */
694 u8 cong_ssthresh; /* Slow-start threshold */
695 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */
696 u8 cong_dup_acks; /* Count of ACKs showing missing packets */
697 u8 cong_cumul_acks; /* Cumulative ACK count */
698 ktime_t cong_tstamp; /* Last time cwnd was changed */
699 struct sk_buff *cong_last_nack; /* Last ACK with nacks received */
700
701 /* Receive-phase ACK management (ACKs we send). */
702 u8 ackr_reason; /* reason to ACK */
703 u16 ackr_sack_base; /* Starting slot in SACK table ring */
704 rxrpc_seq_t ackr_window; /* Base of SACK window */
705 rxrpc_seq_t ackr_wtop; /* Base of SACK window */
706 unsigned int ackr_nr_unacked; /* Number of unacked packets */
707 atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */
708 struct {
709 #define RXRPC_SACK_SIZE 256
710 /* SACK table for soft-acked packets */
711 u8 ackr_sack_table[RXRPC_SACK_SIZE];
712 } __aligned(8);
713
714 /* RTT management */
715 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */
716 ktime_t rtt_sent_at[4]; /* Time packet sent */
717 unsigned long rtt_avail; /* Mask of available slots in bits 0-3,
718 * Mask of pending samples in 8-11 */
719 #define RXRPC_CALL_RTT_AVAIL_MASK 0xf
720 #define RXRPC_CALL_RTT_PEND_SHIFT 8
721
722 /* Transmission-phase ACK management (ACKs we've received). */
723 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */
724 rxrpc_seq_t acks_first_seq; /* first sequence number received */
725 rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */
726 rxrpc_seq_t acks_hard_ack; /* Latest hard-ack point */
727 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
728 rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */
729 };
730
731 /*
732 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
733 */
734 struct rxrpc_ack_summary {
735 u16 nr_acks; /* Number of ACKs in packet */
736 u16 nr_new_acks; /* Number of new ACKs in packet */
737 u16 nr_new_nacks; /* Number of new nacks in packet */
738 u16 nr_retained_nacks; /* Number of nacks retained between ACKs */
739 u8 ack_reason;
740 bool saw_nacks; /* Saw NACKs in packet */
741 bool new_low_nack; /* T if new low NACK found */
742 bool retrans_timeo; /* T if reTx due to timeout happened */
743 u8 flight_size; /* Number of unreceived transmissions */
744 /* Place to stash values for tracing */
745 enum rxrpc_congest_mode mode:8;
746 u8 cwnd;
747 u8 ssthresh;
748 u8 dup_acks;
749 u8 cumulative_acks;
750 };
751
752 /*
753 * sendmsg() cmsg-specified parameters.
754 */
755 enum rxrpc_command {
756 RXRPC_CMD_SEND_DATA, /* send data message */
757 RXRPC_CMD_SEND_ABORT, /* request abort generation */
758 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
759 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */
760 };
761
762 struct rxrpc_call_params {
763 s64 tx_total_len; /* Total Tx data length (if send data) */
764 unsigned long user_call_ID; /* User's call ID */
765 struct {
766 u32 hard; /* Maximum lifetime (sec) */
767 u32 idle; /* Max time since last data packet (msec) */
768 u32 normal; /* Max time since last call packet (msec) */
769 } timeouts;
770 u8 nr_timeouts; /* Number of timeouts specified */
771 bool kernel; /* T if kernel is making the call */
772 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */
773 };
774
775 struct rxrpc_send_params {
776 struct rxrpc_call_params call;
777 u32 abort_code; /* Abort code to Tx (if abort) */
778 enum rxrpc_command command : 8; /* The command to implement */
779 bool exclusive; /* Shared or exclusive call */
780 bool upgrade; /* If the connection is upgradeable */
781 };
782
783 /*
784 * Buffer of data to be output as a packet.
785 */
786 struct rxrpc_txbuf {
787 struct rcu_head rcu;
788 struct list_head call_link; /* Link in call->tx_sendmsg/tx_buffer */
789 struct list_head tx_link; /* Link in live Enc queue or Tx queue */
790 ktime_t last_sent; /* Time at which last transmitted */
791 refcount_t ref;
792 rxrpc_seq_t seq; /* Sequence number of this packet */
793 unsigned int call_debug_id;
794 unsigned int debug_id;
795 unsigned int len; /* Amount of data in buffer */
796 unsigned int space; /* Remaining data space */
797 unsigned int offset; /* Offset of fill point */
798 unsigned long flags;
799 #define RXRPC_TXBUF_LAST 0 /* Set if last packet in Tx phase */
800 #define RXRPC_TXBUF_RESENT 1 /* Set if has been resent */
801 u8 /*enum rxrpc_propose_ack_trace*/ ack_why; /* If ack, why */
802 struct {
803 /* The packet for encrypting and DMA'ing. We align it such
804 * that data[] aligns correctly for any crypto blocksize.
805 */
806 u8 pad[64 - sizeof(struct rxrpc_wire_header)];
807 struct rxrpc_wire_header wire; /* Network-ready header */
808 union {
809 u8 data[RXRPC_JUMBO_DATALEN]; /* Data packet */
810 struct {
811 struct rxrpc_ackpacket ack;
812 DECLARE_FLEX_ARRAY(u8, acks);
813 };
814 };
815 } __aligned(64);
816 };
817
rxrpc_sending_to_server(const struct rxrpc_txbuf * txb)818 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb)
819 {
820 return txb->wire.flags & RXRPC_CLIENT_INITIATED;
821 }
822
rxrpc_sending_to_client(const struct rxrpc_txbuf * txb)823 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb)
824 {
825 return !rxrpc_sending_to_server(txb);
826 }
827
828 #include <trace/events/rxrpc.h>
829
830 /*
831 * Allocate the next serial number on a connection. 0 must be skipped.
832 */
rxrpc_get_next_serial(struct rxrpc_connection * conn)833 static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn)
834 {
835 rxrpc_serial_t serial;
836
837 serial = conn->tx_serial;
838 if (serial == 0)
839 serial = 1;
840 conn->tx_serial = serial + 1;
841 return serial;
842 }
843
844 /*
845 * af_rxrpc.c
846 */
847 extern atomic_t rxrpc_n_rx_skbs;
848 extern struct workqueue_struct *rxrpc_workqueue;
849
850 /*
851 * call_accept.c
852 */
853 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
854 void rxrpc_discard_prealloc(struct rxrpc_sock *);
855 bool rxrpc_new_incoming_call(struct rxrpc_local *local,
856 struct rxrpc_peer *peer,
857 struct rxrpc_connection *conn,
858 struct sockaddr_rxrpc *peer_srx,
859 struct sk_buff *skb);
860 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
861 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long);
862
863 /*
864 * call_event.c
865 */
866 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial,
867 enum rxrpc_propose_ack_trace why);
868 void rxrpc_send_ACK(struct rxrpc_call *, u8, rxrpc_serial_t, enum rxrpc_propose_ack_trace);
869 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t,
870 enum rxrpc_propose_ack_trace);
871 void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *);
872 void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb);
873
874 void rxrpc_reduce_call_timer(struct rxrpc_call *call,
875 unsigned long expire_at,
876 unsigned long now,
877 enum rxrpc_timer_trace why);
878
879 bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb);
880
881 /*
882 * call_object.c
883 */
884 extern const char *const rxrpc_call_states[];
885 extern const char *const rxrpc_call_completions[];
886 extern struct kmem_cache *rxrpc_call_jar;
887
888 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what);
889 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
890 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
891 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
892 struct rxrpc_conn_parameters *,
893 struct sockaddr_rxrpc *,
894 struct rxrpc_call_params *, gfp_t,
895 unsigned int);
896 void rxrpc_start_call_timer(struct rxrpc_call *call);
897 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
898 struct sk_buff *);
899 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
900 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
901 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace);
902 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
903 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
904 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
905 void rxrpc_cleanup_call(struct rxrpc_call *);
906 void rxrpc_destroy_all_calls(struct rxrpc_net *);
907
rxrpc_is_service_call(const struct rxrpc_call * call)908 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
909 {
910 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
911 }
912
rxrpc_is_client_call(const struct rxrpc_call * call)913 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
914 {
915 return !rxrpc_is_service_call(call);
916 }
917
918 /*
919 * call_state.c
920 */
921 bool rxrpc_set_call_completion(struct rxrpc_call *call,
922 enum rxrpc_call_completion compl,
923 u32 abort_code,
924 int error);
925 bool rxrpc_call_completed(struct rxrpc_call *call);
926 bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
927 u32 abort_code, int error, enum rxrpc_abort_reason why);
928 void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl,
929 int error);
930
rxrpc_set_call_state(struct rxrpc_call * call,enum rxrpc_call_state state)931 static inline void rxrpc_set_call_state(struct rxrpc_call *call,
932 enum rxrpc_call_state state)
933 {
934 /* Order write of completion info before write of ->state. */
935 smp_store_release(&call->_state, state);
936 wake_up(&call->waitq);
937 }
938
__rxrpc_call_state(const struct rxrpc_call * call)939 static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call)
940 {
941 return call->_state; /* Only inside I/O thread */
942 }
943
__rxrpc_call_is_complete(const struct rxrpc_call * call)944 static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call)
945 {
946 return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
947 }
948
rxrpc_call_state(const struct rxrpc_call * call)949 static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call)
950 {
951 /* Order read ->state before read of completion info. */
952 return smp_load_acquire(&call->_state);
953 }
954
rxrpc_call_is_complete(const struct rxrpc_call * call)955 static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call)
956 {
957 return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
958 }
959
rxrpc_call_has_failed(const struct rxrpc_call * call)960 static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call)
961 {
962 return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED;
963 }
964
965 /*
966 * conn_client.c
967 */
968 extern unsigned int rxrpc_reap_client_connections;
969 extern unsigned long rxrpc_conn_idle_client_expiry;
970 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
971
972 void rxrpc_purge_client_connections(struct rxrpc_local *local);
973 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
974 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
975 int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp);
976 void rxrpc_connect_client_calls(struct rxrpc_local *local);
977 void rxrpc_expose_client_call(struct rxrpc_call *);
978 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *);
979 void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle);
980 void rxrpc_put_client_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
981 void rxrpc_discard_expired_client_conns(struct rxrpc_local *local);
982 void rxrpc_clean_up_local_conns(struct rxrpc_local *);
983
984 /*
985 * conn_event.c
986 */
987 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb,
988 unsigned int channel);
989 int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb,
990 s32 abort_code, int err, enum rxrpc_abort_reason why);
991 void rxrpc_process_connection(struct work_struct *);
992 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
993 bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb);
994 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb);
995
rxrpc_is_conn_aborted(const struct rxrpc_connection * conn)996 static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn)
997 {
998 /* Order reading the abort info after the state check. */
999 return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED;
1000 }
1001
1002 /*
1003 * conn_object.c
1004 */
1005 extern unsigned int rxrpc_connection_expiry;
1006 extern unsigned int rxrpc_closed_conn_expiry;
1007
1008 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why);
1009 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t);
1010 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *,
1011 struct sockaddr_rxrpc *,
1012 struct sk_buff *);
1013 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
1014 void rxrpc_disconnect_call(struct rxrpc_call *);
1015 void rxrpc_kill_client_conn(struct rxrpc_connection *);
1016 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
1017 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1018 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *,
1019 enum rxrpc_conn_trace);
1020 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *,
1021 enum rxrpc_conn_trace);
1022 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1023 void rxrpc_service_connection_reaper(struct work_struct *);
1024 void rxrpc_destroy_all_connections(struct rxrpc_net *);
1025
rxrpc_conn_is_client(const struct rxrpc_connection * conn)1026 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
1027 {
1028 return conn->out_clientflag;
1029 }
1030
rxrpc_conn_is_service(const struct rxrpc_connection * conn)1031 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
1032 {
1033 return !rxrpc_conn_is_client(conn);
1034 }
1035
rxrpc_reduce_conn_timer(struct rxrpc_connection * conn,unsigned long expire_at)1036 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
1037 unsigned long expire_at)
1038 {
1039 timer_reduce(&conn->timer, expire_at);
1040 }
1041
1042 /*
1043 * conn_service.c
1044 */
1045 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
1046 struct sk_buff *);
1047 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
1048 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *,
1049 const struct rxrpc_security *, struct sk_buff *);
1050 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
1051
1052 /*
1053 * input.c
1054 */
1055 void rxrpc_congestion_degrade(struct rxrpc_call *);
1056 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *);
1057 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *);
1058
1059 /*
1060 * io_thread.c
1061 */
1062 int rxrpc_encap_rcv(struct sock *, struct sk_buff *);
1063 void rxrpc_error_report(struct sock *);
1064 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
1065 s32 abort_code, int err);
1066 int rxrpc_io_thread(void *data);
rxrpc_wake_up_io_thread(struct rxrpc_local * local)1067 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local)
1068 {
1069 wake_up_process(READ_ONCE(local->io_thread));
1070 }
1071
rxrpc_protocol_error(struct sk_buff * skb,enum rxrpc_abort_reason why)1072 static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why)
1073 {
1074 return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO);
1075 }
1076
1077 /*
1078 * insecure.c
1079 */
1080 extern const struct rxrpc_security rxrpc_no_security;
1081
1082 /*
1083 * key.c
1084 */
1085 extern struct key_type key_type_rxrpc;
1086
1087 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int);
1088 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
1089 u32);
1090
1091 /*
1092 * local_event.c
1093 */
1094 void rxrpc_gen_version_string(void);
1095 void rxrpc_send_version_request(struct rxrpc_local *local,
1096 struct rxrpc_host_header *hdr,
1097 struct sk_buff *skb);
1098
1099 /*
1100 * local_object.c
1101 */
1102 void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set);
1103 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1104 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace);
1105 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace);
1106 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace);
1107 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace);
1108 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace);
1109 void rxrpc_destroy_local(struct rxrpc_local *local);
1110 void rxrpc_destroy_all_locals(struct rxrpc_net *);
1111
__rxrpc_use_local(struct rxrpc_local * local,enum rxrpc_local_trace why)1112 static inline bool __rxrpc_use_local(struct rxrpc_local *local,
1113 enum rxrpc_local_trace why)
1114 {
1115 int r, u;
1116
1117 r = refcount_read(&local->ref);
1118 u = atomic_fetch_add_unless(&local->active_users, 1, 0);
1119 trace_rxrpc_local(local->debug_id, why, r, u);
1120 return u != 0;
1121 }
1122
rxrpc_see_local(struct rxrpc_local * local,enum rxrpc_local_trace why)1123 static inline void rxrpc_see_local(struct rxrpc_local *local,
1124 enum rxrpc_local_trace why)
1125 {
1126 int r, u;
1127
1128 r = refcount_read(&local->ref);
1129 u = atomic_read(&local->active_users);
1130 trace_rxrpc_local(local->debug_id, why, r, u);
1131 }
1132
1133 /*
1134 * misc.c
1135 */
1136 extern unsigned int rxrpc_max_backlog __read_mostly;
1137 extern unsigned long rxrpc_soft_ack_delay;
1138 extern unsigned long rxrpc_idle_ack_delay;
1139 extern unsigned int rxrpc_rx_window_size;
1140 extern unsigned int rxrpc_rx_mtu;
1141 extern unsigned int rxrpc_rx_jumbo_max;
1142 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
1143 extern unsigned long rxrpc_inject_rx_delay;
1144 #endif
1145
1146 /*
1147 * net_ns.c
1148 */
1149 extern unsigned int rxrpc_net_id;
1150 extern struct pernet_operations rxrpc_net_ops;
1151
rxrpc_net(struct net * net)1152 static inline struct rxrpc_net *rxrpc_net(struct net *net)
1153 {
1154 return net_generic(net, rxrpc_net_id);
1155 }
1156
1157 /*
1158 * output.c
1159 */
1160 int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
1161 int rxrpc_send_abort_packet(struct rxrpc_call *);
1162 int rxrpc_send_data_packet(struct rxrpc_call *, struct rxrpc_txbuf *);
1163 void rxrpc_send_conn_abort(struct rxrpc_connection *conn);
1164 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb);
1165 void rxrpc_send_keepalive(struct rxrpc_peer *);
1166 void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
1167
1168 /*
1169 * peer_event.c
1170 */
1171 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *);
1172 void rxrpc_peer_keepalive_worker(struct work_struct *);
1173
1174 /*
1175 * peer_object.c
1176 */
1177 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1178 const struct sockaddr_rxrpc *);
1179 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local,
1180 struct sockaddr_rxrpc *srx, gfp_t gfp);
1181 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t,
1182 enum rxrpc_peer_trace);
1183 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer);
1184 void rxrpc_destroy_all_peers(struct rxrpc_net *);
1185 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1186 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace);
1187 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1188
1189 /*
1190 * proc.c
1191 */
1192 extern const struct seq_operations rxrpc_call_seq_ops;
1193 extern const struct seq_operations rxrpc_connection_seq_ops;
1194 extern const struct seq_operations rxrpc_peer_seq_ops;
1195 extern const struct seq_operations rxrpc_local_seq_ops;
1196
1197 /*
1198 * recvmsg.c
1199 */
1200 void rxrpc_notify_socket(struct rxrpc_call *);
1201 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1202
1203 /*
1204 * Abort a call due to a protocol error.
1205 */
rxrpc_abort_eproto(struct rxrpc_call * call,struct sk_buff * skb,s32 abort_code,enum rxrpc_abort_reason why)1206 static inline int rxrpc_abort_eproto(struct rxrpc_call *call,
1207 struct sk_buff *skb,
1208 s32 abort_code,
1209 enum rxrpc_abort_reason why)
1210 {
1211 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
1212
1213 rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why);
1214 return -EPROTO;
1215 }
1216
1217 /*
1218 * rtt.c
1219 */
1220 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int,
1221 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1222 unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool);
1223 void rxrpc_peer_init_rtt(struct rxrpc_peer *);
1224
1225 /*
1226 * rxkad.c
1227 */
1228 #ifdef CONFIG_RXKAD
1229 extern const struct rxrpc_security rxkad;
1230 #endif
1231
1232 /*
1233 * security.c
1234 */
1235 int __init rxrpc_init_security(void);
1236 const struct rxrpc_security *rxrpc_security_lookup(u8);
1237 void rxrpc_exit_security(void);
1238 int rxrpc_init_client_call_security(struct rxrpc_call *);
1239 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1240 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *,
1241 struct sk_buff *);
1242 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *,
1243 struct sk_buff *, u32, u32);
1244
1245 /*
1246 * sendmsg.c
1247 */
1248 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error,
1249 enum rxrpc_abort_reason why);
1250 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1251
1252 /*
1253 * server_key.c
1254 */
1255 extern struct key_type key_type_rxrpc_s;
1256
1257 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int);
1258
1259 /*
1260 * skbuff.c
1261 */
1262 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1263 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1264 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1265 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
1266 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1267 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1268 void rxrpc_purge_queue(struct sk_buff_head *);
1269
1270 /*
1271 * stats.c
1272 */
1273 int rxrpc_stats_show(struct seq_file *seq, void *v);
1274 int rxrpc_stats_clear(struct file *file, char *buf, size_t size);
1275
1276 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s)
1277 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s)
1278
1279 /*
1280 * sysctl.c
1281 */
1282 #ifdef CONFIG_SYSCTL
1283 extern int __init rxrpc_sysctl_init(void);
1284 extern void rxrpc_sysctl_exit(void);
1285 #else
rxrpc_sysctl_init(void)1286 static inline int __init rxrpc_sysctl_init(void) { return 0; }
rxrpc_sysctl_exit(void)1287 static inline void rxrpc_sysctl_exit(void) {}
1288 #endif
1289
1290 /*
1291 * txbuf.c
1292 */
1293 extern atomic_t rxrpc_nr_txbuf;
1294 struct rxrpc_txbuf *rxrpc_alloc_txbuf(struct rxrpc_call *call, u8 packet_type,
1295 gfp_t gfp);
1296 void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1297 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1298 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1299
1300 /*
1301 * utils.c
1302 */
1303 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1304
before(u32 seq1,u32 seq2)1305 static inline bool before(u32 seq1, u32 seq2)
1306 {
1307 return (s32)(seq1 - seq2) < 0;
1308 }
before_eq(u32 seq1,u32 seq2)1309 static inline bool before_eq(u32 seq1, u32 seq2)
1310 {
1311 return (s32)(seq1 - seq2) <= 0;
1312 }
after(u32 seq1,u32 seq2)1313 static inline bool after(u32 seq1, u32 seq2)
1314 {
1315 return (s32)(seq1 - seq2) > 0;
1316 }
after_eq(u32 seq1,u32 seq2)1317 static inline bool after_eq(u32 seq1, u32 seq2)
1318 {
1319 return (s32)(seq1 - seq2) >= 0;
1320 }
1321
1322 /*
1323 * debug tracing
1324 */
1325 extern unsigned int rxrpc_debug;
1326
1327 #define dbgprintk(FMT,...) \
1328 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1329
1330 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1331 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1332 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1333
1334
1335 #if defined(__KDEBUG)
1336 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1337 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1338 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1339
1340 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1341 #define RXRPC_DEBUG_KENTER 0x01
1342 #define RXRPC_DEBUG_KLEAVE 0x02
1343 #define RXRPC_DEBUG_KDEBUG 0x04
1344
1345 #define _enter(FMT,...) \
1346 do { \
1347 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1348 kenter(FMT,##__VA_ARGS__); \
1349 } while (0)
1350
1351 #define _leave(FMT,...) \
1352 do { \
1353 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1354 kleave(FMT,##__VA_ARGS__); \
1355 } while (0)
1356
1357 #define _debug(FMT,...) \
1358 do { \
1359 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1360 kdebug(FMT,##__VA_ARGS__); \
1361 } while (0)
1362
1363 #else
1364 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1365 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1366 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1367 #endif
1368
1369 /*
1370 * debug assertion checking
1371 */
1372 #if 1 // defined(__KDEBUGALL)
1373
1374 #define ASSERT(X) \
1375 do { \
1376 if (unlikely(!(X))) { \
1377 pr_err("Assertion failed\n"); \
1378 BUG(); \
1379 } \
1380 } while (0)
1381
1382 #define ASSERTCMP(X, OP, Y) \
1383 do { \
1384 __typeof__(X) _x = (X); \
1385 __typeof__(Y) _y = (__typeof__(X))(Y); \
1386 if (unlikely(!(_x OP _y))) { \
1387 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1388 (unsigned long)_x, (unsigned long)_x, #OP, \
1389 (unsigned long)_y, (unsigned long)_y); \
1390 BUG(); \
1391 } \
1392 } while (0)
1393
1394 #define ASSERTIF(C, X) \
1395 do { \
1396 if (unlikely((C) && !(X))) { \
1397 pr_err("Assertion failed\n"); \
1398 BUG(); \
1399 } \
1400 } while (0)
1401
1402 #define ASSERTIFCMP(C, X, OP, Y) \
1403 do { \
1404 __typeof__(X) _x = (X); \
1405 __typeof__(Y) _y = (__typeof__(X))(Y); \
1406 if (unlikely((C) && !(_x OP _y))) { \
1407 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1408 (unsigned long)_x, (unsigned long)_x, #OP, \
1409 (unsigned long)_y, (unsigned long)_y); \
1410 BUG(); \
1411 } \
1412 } while (0)
1413
1414 #else
1415
1416 #define ASSERT(X) \
1417 do { \
1418 } while (0)
1419
1420 #define ASSERTCMP(X, OP, Y) \
1421 do { \
1422 } while (0)
1423
1424 #define ASSERTIF(C, X) \
1425 do { \
1426 } while (0)
1427
1428 #define ASSERTIFCMP(C, X, OP, Y) \
1429 do { \
1430 } while (0)
1431
1432 #endif /* __KDEBUGALL */
1433