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
19struct 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
30struct key_preparsed_payload;
31struct rxrpc_connection;
32struct rxrpc_txbuf;
33
34/*
35 * Mark applied to socket buffers in skb->mark. skb->priority is used
36 * to pass supplementary information.
37 */
38enum 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 */
49enum {
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 */
63struct 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 */
125struct 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 */
141struct 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 */
178struct 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 */
199struct rxrpc_skb_priv {
200 struct rxrpc_connection *conn; /* Connection referred to (poke packet) */
201 u16 offset; /* Offset of data */
202 u16 len; /* Length of data */
203 u8 flags;
204#define RXRPC_RX_VERIFIED 0x01
205
206 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */
207};
208
209#define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
210
211/*
212 * RxRPC security module interface
213 */
214struct rxrpc_security {
215 const char *name; /* name of this service */
216 u8 security_index; /* security type provided */
217 u32 no_key_abort; /* Abort code indicating no key */
218
219 /* Initialise a security service */
220 int (*init)(void);
221
222 /* Clean up a security service */
223 void (*exit)(void);
224
225 /* Parse the information from a server key */
226 int (*preparse_server_key)(struct key_preparsed_payload *);
227
228 /* Clean up the preparse buffer after parsing a server key */
229 void (*free_preparse_server_key)(struct key_preparsed_payload *);
230
231 /* Destroy the payload of a server key */
232 void (*destroy_server_key)(struct key *);
233
234 /* Describe a server key */
235 void (*describe_server_key)(const struct key *, struct seq_file *);
236
237 /* initialise a connection's security */
238 int (*init_connection_security)(struct rxrpc_connection *,
239 struct rxrpc_key_token *);
240
241 /* Work out how much data we can store in a packet, given an estimate
242 * of the amount of data remaining.
243 */
244 int (*how_much_data)(struct rxrpc_call *, size_t,
245 size_t *, size_t *, size_t *);
246
247 /* impose security on a packet */
248 int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *);
249
250 /* verify the security on a received packet */
251 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *);
252
253 /* Free crypto request on a call */
254 void (*free_call_crypto)(struct rxrpc_call *);
255
256 /* issue a challenge */
257 int (*issue_challenge)(struct rxrpc_connection *);
258
259 /* respond to a challenge */
260 int (*respond_to_challenge)(struct rxrpc_connection *,
261 struct sk_buff *);
262
263 /* verify a response */
264 int (*verify_response)(struct rxrpc_connection *,
265 struct sk_buff *);
266
267 /* clear connection security */
268 void (*clear)(struct rxrpc_connection *);
269};
270
271/*
272 * RxRPC local transport endpoint description
273 * - owned by a single AF_RXRPC socket
274 * - pointed to by transport socket struct sk_user_data
275 */
276struct rxrpc_local {
277 struct rcu_head rcu;
278 atomic_t active_users; /* Number of users of the local endpoint */
279 refcount_t ref; /* Number of references to the structure */
280 struct net *net; /* The network namespace */
281 struct rxrpc_net *rxnet; /* Our bits in the network namespace */
282 struct hlist_node link;
283 struct socket *socket; /* my UDP socket */
284 struct task_struct *io_thread;
285 struct completion io_thread_ready; /* Indication that the I/O thread started */
286 struct rxrpc_sock *service; /* Service(s) listening on this endpoint */
287#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
288 struct sk_buff_head rx_delay_queue; /* Delay injection queue */
289#endif
290 struct sk_buff_head rx_queue; /* Received packets */
291 struct list_head conn_attend_q; /* Conns requiring immediate attention */
292 struct list_head call_attend_q; /* Calls requiring immediate attention */
293
294 struct rb_root client_bundles; /* Client connection bundles by socket params */
295 spinlock_t client_bundles_lock; /* Lock for client_bundles */
296 bool kill_all_client_conns;
297 struct list_head idle_client_conns;
298 struct timer_list client_conn_reap_timer;
299 unsigned long client_conn_flags;
300#define RXRPC_CLIENT_CONN_REAP_TIMER 0 /* The client conn reap timer expired */
301
302 spinlock_t lock; /* access lock */
303 rwlock_t services_lock; /* lock for services list */
304 int debug_id; /* debug ID for printks */
305 bool dead;
306 bool service_closed; /* Service socket closed */
307 struct idr conn_ids; /* List of connection IDs */
308 struct list_head new_client_calls; /* Newly created client calls need connection */
309 spinlock_t client_call_lock; /* Lock for ->new_client_calls */
310 struct sockaddr_rxrpc srx; /* local address */
311};
312
313/*
314 * RxRPC remote transport endpoint definition
315 * - matched by local endpoint, remote port, address and protocol type
316 */
317struct rxrpc_peer {
318 struct rcu_head rcu; /* This must be first */
319 refcount_t ref;
320 unsigned long hash_key;
321 struct hlist_node hash_link;
322 struct rxrpc_local *local;
323 struct hlist_head error_targets; /* targets for net error distribution */
324 struct rb_root service_conns; /* Service connections */
325 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */
326 time64_t last_tx_at; /* Last time packet sent here */
327 seqlock_t service_conn_lock;
328 spinlock_t lock; /* access lock */
329 unsigned int if_mtu; /* interface MTU for this peer */
330 unsigned int mtu; /* network MTU for this peer */
331 unsigned int maxdata; /* data size (MTU - hdrsize) */
332 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */
333 int debug_id; /* debug ID for printks */
334 struct sockaddr_rxrpc srx; /* remote address */
335
336 /* calculated RTT cache */
337#define RXRPC_RTT_CACHE_SIZE 32
338 spinlock_t rtt_input_lock; /* RTT lock for input routine */
339 ktime_t rtt_last_req; /* Time of last RTT request */
340 unsigned int rtt_count; /* Number of samples we've got */
341
342 u32 srtt_us; /* smoothed round trip time << 3 in usecs */
343 u32 mdev_us; /* medium deviation */
344 u32 mdev_max_us; /* maximal mdev for the last rtt period */
345 u32 rttvar_us; /* smoothed mdev_max */
346 u32 rto_j; /* Retransmission timeout in jiffies */
347 u8 backoff; /* Backoff timeout */
348
349 u8 cong_ssthresh; /* Congestion slow-start threshold */
350};
351
352/*
353 * Keys for matching a connection.
354 */
355struct rxrpc_conn_proto {
356 union {
357 struct {
358 u32 epoch; /* epoch of this connection */
359 u32 cid; /* connection ID */
360 };
361 u64 index_key;
362 };
363};
364
365struct rxrpc_conn_parameters {
366 struct rxrpc_local *local; /* Representation of local endpoint */
367 struct key *key; /* Security details */
368 bool exclusive; /* T if conn is exclusive */
369 bool upgrade; /* T if service ID can be upgraded */
370 u16 service_id; /* Service ID for this connection */
371 u32 security_level; /* Security level selected */
372};
373
374/*
375 * Call completion condition (state == RXRPC_CALL_COMPLETE).
376 */
377enum rxrpc_call_completion {
378 RXRPC_CALL_SUCCEEDED, /* - Normal termination */
379 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */
380 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */
381 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */
382 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */
383 NR__RXRPC_CALL_COMPLETIONS
384};
385
386/*
387 * Bits in the connection flags.
388 */
389enum rxrpc_conn_flag {
390 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */
391 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */
392 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
393 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */
394 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */
395 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */
396 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */
397};
398
399#define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \
400 (1UL << RXRPC_CONN_FINAL_ACK_1) | \
401 (1UL << RXRPC_CONN_FINAL_ACK_2) | \
402 (1UL << RXRPC_CONN_FINAL_ACK_3))
403
404/*
405 * Events that can be raised upon a connection.
406 */
407enum rxrpc_conn_event {
408 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */
409 RXRPC_CONN_EV_ABORT_CALLS, /* Abort attached calls */
410};
411
412/*
413 * The connection protocol state.
414 */
415enum rxrpc_conn_proto_state {
416 RXRPC_CONN_UNUSED, /* Connection not yet attempted */
417 RXRPC_CONN_CLIENT_UNSECURED, /* Client connection needs security init */
418 RXRPC_CONN_CLIENT, /* Client connection */
419 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */
420 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */
421 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
422 RXRPC_CONN_SERVICE, /* Service secured connection */
423 RXRPC_CONN_ABORTED, /* Conn aborted */
424 RXRPC_CONN__NR_STATES
425};
426
427/*
428 * RxRPC client connection bundle.
429 */
430struct rxrpc_bundle {
431 struct rxrpc_local *local; /* Representation of local endpoint */
432 struct rxrpc_peer *peer; /* Remote endpoint */
433 struct key *key; /* Security details */
434 const struct rxrpc_security *security; /* applied security module */
435 refcount_t ref;
436 atomic_t active; /* Number of active users */
437 unsigned int debug_id;
438 u32 security_level; /* Security level selected */
439 u16 service_id; /* Service ID for this connection */
440 bool try_upgrade; /* True if the bundle is attempting upgrade */
441 bool exclusive; /* T if conn is exclusive */
442 bool upgrade; /* T if service ID can be upgraded */
443 unsigned short alloc_error; /* Error from last conn allocation */
444 struct rb_node local_node; /* Node in local->client_conns */
445 struct list_head waiting_calls; /* Calls waiting for channels */
446 unsigned long avail_chans; /* Mask of available channels */
447 struct rxrpc_connection *conns[4]; /* The connections in the bundle (max 4) */
448};
449
450/*
451 * RxRPC connection definition
452 * - matched by { local, peer, epoch, conn_id, direction }
453 * - each connection can only handle four simultaneous calls
454 */
455struct rxrpc_connection {
456 struct rxrpc_conn_proto proto;
457 struct rxrpc_local *local; /* Representation of local endpoint */
458 struct rxrpc_peer *peer; /* Remote endpoint */
459 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */
460 struct key *key; /* Security details */
461 struct list_head attend_link; /* Link in local->conn_attend_q */
462
463 refcount_t ref;
464 atomic_t active; /* Active count for service conns */
465 struct rcu_head rcu;
466 struct list_head cache_link;
467
468 unsigned char act_chans; /* Mask of active channels */
469 struct rxrpc_channel {
470 unsigned long final_ack_at; /* Time at which to issue final ACK */
471 struct rxrpc_call *call; /* Active call */
472 unsigned int call_debug_id; /* call->debug_id */
473 u32 call_id; /* ID of current call */
474 u32 call_counter; /* Call ID counter */
475 u32 last_call; /* ID of last call */
476 u8 last_type; /* Type of last packet */
477 union {
478 u32 last_seq;
479 u32 last_abort;
480 };
481 } channels[RXRPC_MAXCALLS];
482
483 struct timer_list timer; /* Conn event timer */
484 struct work_struct processor; /* connection event processor */
485 struct work_struct destructor; /* In-process-context destroyer */
486 struct rxrpc_bundle *bundle; /* Client connection bundle */
487 struct rb_node service_node; /* Node in peer->service_conns */
488 struct list_head proc_link; /* link in procfs list */
489 struct list_head link; /* link in master connection list */
490 struct sk_buff_head rx_queue; /* received conn-level packets */
491
492 struct mutex security_lock; /* Lock for security management */
493 const struct rxrpc_security *security; /* applied security module */
494 union {
495 struct {
496 struct crypto_sync_skcipher *cipher; /* encryption handle */
497 struct rxrpc_crypt csum_iv; /* packet checksum base */
498 u32 nonce; /* response re-use preventer */
499 } rxkad;
500 };
501 unsigned long flags;
502 unsigned long events;
503 unsigned long idle_timestamp; /* Time at which last became idle */
504 spinlock_t state_lock; /* state-change lock */
505 enum rxrpc_conn_proto_state state; /* current state of connection */
506 enum rxrpc_call_completion completion; /* Completion condition */
507 s32 abort_code; /* Abort code of connection abort */
508 int debug_id; /* debug ID for printks */
509 atomic_t serial; /* packet serial number counter */
510 unsigned int hi_serial; /* highest serial number received */
511 u32 service_id; /* Service ID, possibly upgraded */
512 u32 security_level; /* Security level selected */
513 u8 security_ix; /* security type */
514 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
515 u8 bundle_shift; /* Index into bundle->avail_chans */
516 bool exclusive; /* T if conn is exclusive */
517 bool upgrade; /* T if service ID can be upgraded */
518 u16 orig_service_id; /* Originally requested service ID */
519 short error; /* Local error code */
520};
521
522static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
523{
524 return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
525}
526
527static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
528{
529 return !rxrpc_to_server(sp);
530}
531
532/*
533 * Flags in call->flags.
534 */
535enum rxrpc_call_flag {
536 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */
537 RXRPC_CALL_HAS_USERID, /* has a user ID attached */
538 RXRPC_CALL_IS_SERVICE, /* Call is service call */
539 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */
540 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */
541 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */
542 RXRPC_CALL_TX_ALL_ACKED, /* Last packet has been hard-acked */
543 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */
544 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */
545 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */
546 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */
547 RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */
548 RXRPC_CALL_KERNEL, /* The call was made by the kernel */
549 RXRPC_CALL_UPGRADE, /* Service upgrade was requested for the call */
550 RXRPC_CALL_EXCLUSIVE, /* The call uses a once-only connection */
551 RXRPC_CALL_RX_IS_IDLE, /* recvmsg() is idle - send an ACK */
552 RXRPC_CALL_RECVMSG_READ_ALL, /* recvmsg() read all of the received data */
553};
554
555/*
556 * Events that can be raised on a call.
557 */
558enum rxrpc_call_event {
559 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */
560 RXRPC_CALL_EV_INITIAL_PING, /* Send initial ping for a new service call */
561};
562
563/*
564 * The states that a call can be in.
565 */
566enum rxrpc_call_state {
567 RXRPC_CALL_UNINITIALISED,
568 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */
569 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
570 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */
571 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */
572 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */
573 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */
574 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
575 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */
576 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */
577 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */
578 RXRPC_CALL_COMPLETE, /* - call complete */
579 NR__RXRPC_CALL_STATES
580};
581
582/*
583 * Call Tx congestion management modes.
584 */
585enum rxrpc_congest_mode {
586 RXRPC_CALL_SLOW_START,
587 RXRPC_CALL_CONGEST_AVOIDANCE,
588 RXRPC_CALL_PACKET_LOSS,
589 RXRPC_CALL_FAST_RETRANSMIT,
590 NR__RXRPC_CONGEST_MODES
591};
592
593/*
594 * RxRPC call definition
595 * - matched by { connection, call_id }
596 */
597struct rxrpc_call {
598 struct rcu_head rcu;
599 struct rxrpc_connection *conn; /* connection carrying call */
600 struct rxrpc_bundle *bundle; /* Connection bundle to use */
601 struct rxrpc_peer *peer; /* Peer record for remote address */
602 struct rxrpc_local *local; /* Representation of local endpoint */
603 struct rxrpc_sock __rcu *socket; /* socket responsible */
604 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */
605 struct key *key; /* Security details */
606 const struct rxrpc_security *security; /* applied security module */
607 struct mutex user_mutex; /* User access mutex */
608 struct sockaddr_rxrpc dest_srx; /* Destination address */
609 unsigned long delay_ack_at; /* When DELAY ACK needs to happen */
610 unsigned long ack_lost_at; /* When ACK is figured as lost */
611 unsigned long resend_at; /* When next resend needs to happen */
612 unsigned long ping_at; /* When next to send a ping */
613 unsigned long keepalive_at; /* When next to send a keepalive ping */
614 unsigned long expect_rx_by; /* When we expect to get a packet by */
615 unsigned long expect_req_by; /* When we expect to get a request DATA packet by */
616 unsigned long expect_term_by; /* When we expect call termination by */
617 u32 next_rx_timo; /* Timeout for next Rx packet (jif) */
618 u32 next_req_timo; /* Timeout for next Rx request packet (jif) */
619 u32 hard_timo; /* Maximum lifetime or 0 (jif) */
620 struct timer_list timer; /* Combined event timer */
621 struct work_struct destroyer; /* In-process-context destroyer */
622 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */
623 struct list_head link; /* link in master call list */
624 struct list_head wait_link; /* Link in local->new_client_calls */
625 struct hlist_node error_link; /* link in error distribution list */
626 struct list_head accept_link; /* Link in rx->acceptq */
627 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */
628 struct list_head sock_link; /* Link in rx->sock_calls */
629 struct rb_node sock_node; /* Node in rx->calls */
630 struct list_head attend_link; /* Link in local->call_attend_q */
631 struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */
632 wait_queue_head_t waitq; /* Wait queue for channel or Tx */
633 s64 tx_total_len; /* Total length left to be transmitted (or -1) */
634 unsigned long user_call_ID; /* user-defined call ID */
635 unsigned long flags;
636 unsigned long events;
637 spinlock_t notify_lock; /* Kernel notification lock */
638 unsigned int send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */
639 s32 send_abort; /* Abort code to be sent */
640 short send_abort_err; /* Error to be associated with the abort */
641 rxrpc_seq_t send_abort_seq; /* DATA packet that incurred the abort (or 0) */
642 s32 abort_code; /* Local/remote abort code */
643 int error; /* Local error incurred */
644 enum rxrpc_call_state _state; /* Current state of call (needs barrier) */
645 enum rxrpc_call_completion completion; /* Call completion condition */
646 refcount_t ref;
647 u8 security_ix; /* Security type */
648 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */
649 u32 call_id; /* call ID on connection */
650 u32 cid; /* connection ID plus channel index */
651 u32 security_level; /* Security level selected */
652 int debug_id; /* debug ID for printks */
653 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */
654 unsigned short rx_pkt_len; /* Current recvmsg packet len */
655
656 /* Transmitted data tracking. */
657 spinlock_t tx_lock; /* Transmit queue lock */
658 struct list_head tx_sendmsg; /* Sendmsg prepared packets */
659 struct list_head tx_buffer; /* Buffer of transmissible packets */
660 rxrpc_seq_t tx_bottom; /* First packet in buffer */
661 rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */
662 rxrpc_seq_t tx_prepared; /* Highest Tx slot prepared. */
663 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */
664 u16 tx_backoff; /* Delay to insert due to Tx failure */
665 u8 tx_winsize; /* Maximum size of Tx window */
666#define RXRPC_TX_MAX_WINDOW 128
667 ktime_t tx_last_sent; /* Last time a transmission occurred */
668
669 /* Received data tracking */
670 struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */
671 struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */
672
673 rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */
674 rxrpc_seq_t rx_consumed; /* Highest packet consumed */
675 rxrpc_serial_t rx_serial; /* Highest serial received for this call */
676 u8 rx_winsize; /* Size of Rx window */
677
678 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS
679 * is fixed, we keep these numbers in terms of segments (ie. DATA
680 * packets) rather than bytes.
681 */
682#define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN
683#define RXRPC_MIN_CWND (RXRPC_TX_SMSS > 2190 ? 2 : RXRPC_TX_SMSS > 1095 ? 3 : 4)
684 u8 cong_cwnd; /* Congestion window size */
685 u8 cong_extra; /* Extra to send for congestion management */
686 u8 cong_ssthresh; /* Slow-start threshold */
687 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */
688 u8 cong_dup_acks; /* Count of ACKs showing missing packets */
689 u8 cong_cumul_acks; /* Cumulative ACK count */
690 ktime_t cong_tstamp; /* Last time cwnd was changed */
691
692 /* Receive-phase ACK management (ACKs we send). */
693 u8 ackr_reason; /* reason to ACK */
694 u16 ackr_sack_base; /* Starting slot in SACK table ring */
695 rxrpc_serial_t ackr_serial; /* serial of packet being ACK'd */
696 rxrpc_seq_t ackr_window; /* Base of SACK window */
697 rxrpc_seq_t ackr_wtop; /* Base of SACK window */
698 unsigned int ackr_nr_unacked; /* Number of unacked packets */
699 atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */
700 struct {
701#define RXRPC_SACK_SIZE 256
702 /* SACK table for soft-acked packets */
703 u8 ackr_sack_table[RXRPC_SACK_SIZE];
704 } __aligned(8);
705
706 /* RTT management */
707 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */
708 ktime_t rtt_sent_at[4]; /* Time packet sent */
709 unsigned long rtt_avail; /* Mask of available slots in bits 0-3,
710 * Mask of pending samples in 8-11 */
711#define RXRPC_CALL_RTT_AVAIL_MASK 0xf
712#define RXRPC_CALL_RTT_PEND_SHIFT 8
713
714 /* Transmission-phase ACK management (ACKs we've received). */
715 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */
716 rxrpc_seq_t acks_first_seq; /* first sequence number received */
717 rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */
718 rxrpc_seq_t acks_hard_ack; /* Latest hard-ack point */
719 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
720 rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */
721};
722
723/*
724 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
725 */
726struct rxrpc_ack_summary {
727 u16 nr_acks; /* Number of ACKs in packet */
728 u16 nr_new_acks; /* Number of new ACKs in packet */
729 u16 nr_rot_new_acks; /* Number of rotated new ACKs */
730 u8 ack_reason;
731 bool saw_nacks; /* Saw NACKs in packet */
732 bool new_low_nack; /* T if new low NACK found */
733 bool retrans_timeo; /* T if reTx due to timeout happened */
734 u8 flight_size; /* Number of unreceived transmissions */
735 /* Place to stash values for tracing */
736 enum rxrpc_congest_mode mode:8;
737 u8 cwnd;
738 u8 ssthresh;
739 u8 dup_acks;
740 u8 cumulative_acks;
741};
742
743/*
744 * sendmsg() cmsg-specified parameters.
745 */
746enum rxrpc_command {
747 RXRPC_CMD_SEND_DATA, /* send data message */
748 RXRPC_CMD_SEND_ABORT, /* request abort generation */
749 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
750 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */
751};
752
753struct rxrpc_call_params {
754 s64 tx_total_len; /* Total Tx data length (if send data) */
755 unsigned long user_call_ID; /* User's call ID */
756 struct {
757 u32 hard; /* Maximum lifetime (sec) */
758 u32 idle; /* Max time since last data packet (msec) */
759 u32 normal; /* Max time since last call packet (msec) */
760 } timeouts;
761 u8 nr_timeouts; /* Number of timeouts specified */
762 bool kernel; /* T if kernel is making the call */
763 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */
764};
765
766struct rxrpc_send_params {
767 struct rxrpc_call_params call;
768 u32 abort_code; /* Abort code to Tx (if abort) */
769 enum rxrpc_command command : 8; /* The command to implement */
770 bool exclusive; /* Shared or exclusive call */
771 bool upgrade; /* If the connection is upgradeable */
772};
773
774/*
775 * Buffer of data to be output as a packet.
776 */
777struct rxrpc_txbuf {
778 struct rcu_head rcu;
779 struct list_head call_link; /* Link in call->tx_sendmsg/tx_buffer */
780 struct list_head tx_link; /* Link in live Enc queue or Tx queue */
781 ktime_t last_sent; /* Time at which last transmitted */
782 refcount_t ref;
783 rxrpc_seq_t seq; /* Sequence number of this packet */
784 unsigned int call_debug_id;
785 unsigned int debug_id;
786 unsigned int len; /* Amount of data in buffer */
787 unsigned int space; /* Remaining data space */
788 unsigned int offset; /* Offset of fill point */
789 unsigned long flags;
790#define RXRPC_TXBUF_LAST 0 /* Set if last packet in Tx phase */
791#define RXRPC_TXBUF_RESENT 1 /* Set if has been resent */
792 u8 /*enum rxrpc_propose_ack_trace*/ ack_why; /* If ack, why */
793 struct {
794 /* The packet for encrypting and DMA'ing. We align it such
795 * that data[] aligns correctly for any crypto blocksize.
796 */
797 u8 pad[64 - sizeof(struct rxrpc_wire_header)];
798 struct rxrpc_wire_header wire; /* Network-ready header */
799 union {
800 u8 data[RXRPC_JUMBO_DATALEN]; /* Data packet */
801 struct {
802 struct rxrpc_ackpacket ack;
803 DECLARE_FLEX_ARRAY(u8, acks);
804 };
805 };
806 } __aligned(64);
807};
808
809static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb)
810{
811 return txb->wire.flags & RXRPC_CLIENT_INITIATED;
812}
813
814static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb)
815{
816 return !rxrpc_sending_to_server(txb);
817}
818
819#include <trace/events/rxrpc.h>
820
821/*
822 * af_rxrpc.c
823 */
824extern atomic_t rxrpc_n_rx_skbs;
825extern struct workqueue_struct *rxrpc_workqueue;
826
827/*
828 * call_accept.c
829 */
830int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
831void rxrpc_discard_prealloc(struct rxrpc_sock *);
832bool rxrpc_new_incoming_call(struct rxrpc_local *local,
833 struct rxrpc_peer *peer,
834 struct rxrpc_connection *conn,
835 struct sockaddr_rxrpc *peer_srx,
836 struct sk_buff *skb);
837void rxrpc_accept_incoming_calls(struct rxrpc_local *);
838int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long);
839
840/*
841 * call_event.c
842 */
843void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial,
844 enum rxrpc_propose_ack_trace why);
845void rxrpc_send_ACK(struct rxrpc_call *, u8, rxrpc_serial_t, enum rxrpc_propose_ack_trace);
846void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t,
847 enum rxrpc_propose_ack_trace);
848void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *);
849void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb);
850
851void rxrpc_reduce_call_timer(struct rxrpc_call *call,
852 unsigned long expire_at,
853 unsigned long now,
854 enum rxrpc_timer_trace why);
855
856bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb);
857
858/*
859 * call_object.c
860 */
861extern const char *const rxrpc_call_states[];
862extern const char *const rxrpc_call_completions[];
863extern struct kmem_cache *rxrpc_call_jar;
864
865void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what);
866struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
867struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
868struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
869 struct rxrpc_conn_parameters *,
870 struct sockaddr_rxrpc *,
871 struct rxrpc_call_params *, gfp_t,
872 unsigned int);
873void rxrpc_start_call_timer(struct rxrpc_call *call);
874void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
875 struct sk_buff *);
876void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
877void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
878void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace);
879struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
880void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
881void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
882void rxrpc_cleanup_call(struct rxrpc_call *);
883void rxrpc_destroy_all_calls(struct rxrpc_net *);
884
885static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
886{
887 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
888}
889
890static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
891{
892 return !rxrpc_is_service_call(call);
893}
894
895/*
896 * call_state.c
897 */
898bool rxrpc_set_call_completion(struct rxrpc_call *call,
899 enum rxrpc_call_completion compl,
900 u32 abort_code,
901 int error);
902bool rxrpc_call_completed(struct rxrpc_call *call);
903bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
904 u32 abort_code, int error, enum rxrpc_abort_reason why);
905void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl,
906 int error);
907
908static inline void rxrpc_set_call_state(struct rxrpc_call *call,
909 enum rxrpc_call_state state)
910{
911 /* Order write of completion info before write of ->state. */
912 smp_store_release(&call->_state, state);
913 wake_up(&call->waitq);
914}
915
916static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call)
917{
918 return call->_state; /* Only inside I/O thread */
919}
920
921static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call)
922{
923 return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
924}
925
926static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call)
927{
928 /* Order read ->state before read of completion info. */
929 return smp_load_acquire(&call->_state);
930}
931
932static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call)
933{
934 return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
935}
936
937static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call)
938{
939 return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED;
940}
941
942/*
943 * conn_client.c
944 */
945extern unsigned int rxrpc_reap_client_connections;
946extern unsigned long rxrpc_conn_idle_client_expiry;
947extern unsigned long rxrpc_conn_idle_client_fast_expiry;
948
949void rxrpc_purge_client_connections(struct rxrpc_local *local);
950struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
951void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
952int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp);
953void rxrpc_connect_client_calls(struct rxrpc_local *local);
954void rxrpc_expose_client_call(struct rxrpc_call *);
955void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *);
956void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle);
957void rxrpc_put_client_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
958void rxrpc_discard_expired_client_conns(struct rxrpc_local *local);
959void rxrpc_clean_up_local_conns(struct rxrpc_local *);
960
961/*
962 * conn_event.c
963 */
964void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb,
965 unsigned int channel);
966int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb,
967 s32 abort_code, int err, enum rxrpc_abort_reason why);
968void rxrpc_process_connection(struct work_struct *);
969void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
970bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb);
971void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb);
972
973static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn)
974{
975 /* Order reading the abort info after the state check. */
976 return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED;
977}
978
979/*
980 * conn_object.c
981 */
982extern unsigned int rxrpc_connection_expiry;
983extern unsigned int rxrpc_closed_conn_expiry;
984
985void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why);
986struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t);
987struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *,
988 struct sockaddr_rxrpc *,
989 struct sk_buff *);
990void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
991void rxrpc_disconnect_call(struct rxrpc_call *);
992void rxrpc_kill_client_conn(struct rxrpc_connection *);
993void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
994void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
995struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *,
996 enum rxrpc_conn_trace);
997struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *,
998 enum rxrpc_conn_trace);
999void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1000void rxrpc_service_connection_reaper(struct work_struct *);
1001void rxrpc_destroy_all_connections(struct rxrpc_net *);
1002
1003static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
1004{
1005 return conn->out_clientflag;
1006}
1007
1008static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
1009{
1010 return !rxrpc_conn_is_client(conn);
1011}
1012
1013static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
1014 unsigned long expire_at)
1015{
1016 timer_reduce(timer: &conn->timer, expires: expire_at);
1017}
1018
1019/*
1020 * conn_service.c
1021 */
1022struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
1023 struct sk_buff *);
1024struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
1025void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *,
1026 const struct rxrpc_security *, struct sk_buff *);
1027void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
1028
1029/*
1030 * input.c
1031 */
1032void rxrpc_congestion_degrade(struct rxrpc_call *);
1033void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *);
1034void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *);
1035
1036/*
1037 * io_thread.c
1038 */
1039int rxrpc_encap_rcv(struct sock *, struct sk_buff *);
1040void rxrpc_error_report(struct sock *);
1041bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
1042 s32 abort_code, int err);
1043int rxrpc_io_thread(void *data);
1044static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local)
1045{
1046 wake_up_process(tsk: local->io_thread);
1047}
1048
1049static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why)
1050{
1051 return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, err: -EPROTO);
1052}
1053
1054/*
1055 * insecure.c
1056 */
1057extern const struct rxrpc_security rxrpc_no_security;
1058
1059/*
1060 * key.c
1061 */
1062extern struct key_type key_type_rxrpc;
1063
1064int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int);
1065int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
1066 u32);
1067
1068/*
1069 * local_event.c
1070 */
1071void rxrpc_gen_version_string(void);
1072void rxrpc_send_version_request(struct rxrpc_local *local,
1073 struct rxrpc_host_header *hdr,
1074 struct sk_buff *skb);
1075
1076/*
1077 * local_object.c
1078 */
1079struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1080struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace);
1081struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace);
1082void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace);
1083struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace);
1084void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace);
1085void rxrpc_destroy_local(struct rxrpc_local *local);
1086void rxrpc_destroy_all_locals(struct rxrpc_net *);
1087
1088static inline bool __rxrpc_use_local(struct rxrpc_local *local,
1089 enum rxrpc_local_trace why)
1090{
1091 int r, u;
1092
1093 r = refcount_read(r: &local->ref);
1094 u = atomic_fetch_add_unless(v: &local->active_users, a: 1, u: 0);
1095 trace_rxrpc_local(local_debug_id: local->debug_id, op: why, ref: r, usage: u);
1096 return u != 0;
1097}
1098
1099static inline void rxrpc_see_local(struct rxrpc_local *local,
1100 enum rxrpc_local_trace why)
1101{
1102 int r, u;
1103
1104 r = refcount_read(r: &local->ref);
1105 u = atomic_read(v: &local->active_users);
1106 trace_rxrpc_local(local_debug_id: local->debug_id, op: why, ref: r, usage: u);
1107}
1108
1109/*
1110 * misc.c
1111 */
1112extern unsigned int rxrpc_max_backlog __read_mostly;
1113extern unsigned long rxrpc_soft_ack_delay;
1114extern unsigned long rxrpc_idle_ack_delay;
1115extern unsigned int rxrpc_rx_window_size;
1116extern unsigned int rxrpc_rx_mtu;
1117extern unsigned int rxrpc_rx_jumbo_max;
1118#ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
1119extern unsigned long rxrpc_inject_rx_delay;
1120#endif
1121
1122/*
1123 * net_ns.c
1124 */
1125extern unsigned int rxrpc_net_id;
1126extern struct pernet_operations rxrpc_net_ops;
1127
1128static inline struct rxrpc_net *rxrpc_net(struct net *net)
1129{
1130 return net_generic(net, id: rxrpc_net_id);
1131}
1132
1133/*
1134 * output.c
1135 */
1136int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
1137int rxrpc_send_abort_packet(struct rxrpc_call *);
1138int rxrpc_send_data_packet(struct rxrpc_call *, struct rxrpc_txbuf *);
1139void rxrpc_send_conn_abort(struct rxrpc_connection *conn);
1140void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb);
1141void rxrpc_send_keepalive(struct rxrpc_peer *);
1142void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
1143
1144/*
1145 * peer_event.c
1146 */
1147void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *);
1148void rxrpc_peer_keepalive_worker(struct work_struct *);
1149
1150/*
1151 * peer_object.c
1152 */
1153struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1154 const struct sockaddr_rxrpc *);
1155struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local,
1156 struct sockaddr_rxrpc *srx, gfp_t gfp);
1157struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t,
1158 enum rxrpc_peer_trace);
1159void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer);
1160void rxrpc_destroy_all_peers(struct rxrpc_net *);
1161struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1162struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace);
1163void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1164
1165/*
1166 * proc.c
1167 */
1168extern const struct seq_operations rxrpc_call_seq_ops;
1169extern const struct seq_operations rxrpc_connection_seq_ops;
1170extern const struct seq_operations rxrpc_peer_seq_ops;
1171extern const struct seq_operations rxrpc_local_seq_ops;
1172
1173/*
1174 * recvmsg.c
1175 */
1176void rxrpc_notify_socket(struct rxrpc_call *);
1177int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1178
1179/*
1180 * Abort a call due to a protocol error.
1181 */
1182static inline int rxrpc_abort_eproto(struct rxrpc_call *call,
1183 struct sk_buff *skb,
1184 s32 abort_code,
1185 enum rxrpc_abort_reason why)
1186{
1187 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
1188
1189 rxrpc_abort_call(call, seq: sp->hdr.seq, abort_code, error: -EPROTO, why);
1190 return -EPROTO;
1191}
1192
1193/*
1194 * rtt.c
1195 */
1196void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int,
1197 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1198unsigned long rxrpc_get_rto_backoff(struct rxrpc_peer *, bool);
1199void rxrpc_peer_init_rtt(struct rxrpc_peer *);
1200
1201/*
1202 * rxkad.c
1203 */
1204#ifdef CONFIG_RXKAD
1205extern const struct rxrpc_security rxkad;
1206#endif
1207
1208/*
1209 * security.c
1210 */
1211int __init rxrpc_init_security(void);
1212const struct rxrpc_security *rxrpc_security_lookup(u8);
1213void rxrpc_exit_security(void);
1214int rxrpc_init_client_call_security(struct rxrpc_call *);
1215int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1216const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *,
1217 struct sk_buff *);
1218struct key *rxrpc_look_up_server_security(struct rxrpc_connection *,
1219 struct sk_buff *, u32, u32);
1220
1221/*
1222 * sendmsg.c
1223 */
1224bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error,
1225 enum rxrpc_abort_reason why);
1226int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1227
1228/*
1229 * server_key.c
1230 */
1231extern struct key_type key_type_rxrpc_s;
1232
1233int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int);
1234
1235/*
1236 * skbuff.c
1237 */
1238void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1239void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1240void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1241void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
1242void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1243void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1244void rxrpc_purge_queue(struct sk_buff_head *);
1245
1246/*
1247 * stats.c
1248 */
1249int rxrpc_stats_show(struct seq_file *seq, void *v);
1250int rxrpc_stats_clear(struct file *file, char *buf, size_t size);
1251
1252#define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s)
1253#define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s)
1254
1255/*
1256 * sysctl.c
1257 */
1258#ifdef CONFIG_SYSCTL
1259extern int __init rxrpc_sysctl_init(void);
1260extern void rxrpc_sysctl_exit(void);
1261#else
1262static inline int __init rxrpc_sysctl_init(void) { return 0; }
1263static inline void rxrpc_sysctl_exit(void) {}
1264#endif
1265
1266/*
1267 * txbuf.c
1268 */
1269extern atomic_t rxrpc_nr_txbuf;
1270struct rxrpc_txbuf *rxrpc_alloc_txbuf(struct rxrpc_call *call, u8 packet_type,
1271 gfp_t gfp);
1272void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1273void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1274void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1275
1276/*
1277 * utils.c
1278 */
1279int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1280
1281static inline bool before(u32 seq1, u32 seq2)
1282{
1283 return (s32)(seq1 - seq2) < 0;
1284}
1285static inline bool before_eq(u32 seq1, u32 seq2)
1286{
1287 return (s32)(seq1 - seq2) <= 0;
1288}
1289static inline bool after(u32 seq1, u32 seq2)
1290{
1291 return (s32)(seq1 - seq2) > 0;
1292}
1293static inline bool after_eq(u32 seq1, u32 seq2)
1294{
1295 return (s32)(seq1 - seq2) >= 0;
1296}
1297
1298/*
1299 * debug tracing
1300 */
1301extern unsigned int rxrpc_debug;
1302
1303#define dbgprintk(FMT,...) \
1304 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1305
1306#define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1307#define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1308#define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1309
1310
1311#if defined(__KDEBUG)
1312#define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1313#define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1314#define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1315
1316#elif defined(CONFIG_AF_RXRPC_DEBUG)
1317#define RXRPC_DEBUG_KENTER 0x01
1318#define RXRPC_DEBUG_KLEAVE 0x02
1319#define RXRPC_DEBUG_KDEBUG 0x04
1320
1321#define _enter(FMT,...) \
1322do { \
1323 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1324 kenter(FMT,##__VA_ARGS__); \
1325} while (0)
1326
1327#define _leave(FMT,...) \
1328do { \
1329 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1330 kleave(FMT,##__VA_ARGS__); \
1331} while (0)
1332
1333#define _debug(FMT,...) \
1334do { \
1335 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1336 kdebug(FMT,##__VA_ARGS__); \
1337} while (0)
1338
1339#else
1340#define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1341#define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1342#define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1343#endif
1344
1345/*
1346 * debug assertion checking
1347 */
1348#if 1 // defined(__KDEBUGALL)
1349
1350#define ASSERT(X) \
1351do { \
1352 if (unlikely(!(X))) { \
1353 pr_err("Assertion failed\n"); \
1354 BUG(); \
1355 } \
1356} while (0)
1357
1358#define ASSERTCMP(X, OP, Y) \
1359do { \
1360 __typeof__(X) _x = (X); \
1361 __typeof__(Y) _y = (__typeof__(X))(Y); \
1362 if (unlikely(!(_x OP _y))) { \
1363 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1364 (unsigned long)_x, (unsigned long)_x, #OP, \
1365 (unsigned long)_y, (unsigned long)_y); \
1366 BUG(); \
1367 } \
1368} while (0)
1369
1370#define ASSERTIF(C, X) \
1371do { \
1372 if (unlikely((C) && !(X))) { \
1373 pr_err("Assertion failed\n"); \
1374 BUG(); \
1375 } \
1376} while (0)
1377
1378#define ASSERTIFCMP(C, X, OP, Y) \
1379do { \
1380 __typeof__(X) _x = (X); \
1381 __typeof__(Y) _y = (__typeof__(X))(Y); \
1382 if (unlikely((C) && !(_x OP _y))) { \
1383 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1384 (unsigned long)_x, (unsigned long)_x, #OP, \
1385 (unsigned long)_y, (unsigned long)_y); \
1386 BUG(); \
1387 } \
1388} while (0)
1389
1390#else
1391
1392#define ASSERT(X) \
1393do { \
1394} while (0)
1395
1396#define ASSERTCMP(X, OP, Y) \
1397do { \
1398} while (0)
1399
1400#define ASSERTIF(C, X) \
1401do { \
1402} while (0)
1403
1404#define ASSERTIFCMP(C, X, OP, Y) \
1405do { \
1406} while (0)
1407
1408#endif /* __KDEBUGALL */
1409

source code of linux/net/rxrpc/ar-internal.h