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 bundle_proc_list; /* List of bundles for proc */
72 struct list_head conn_proc_list; /* List of conns in this namespace for proc */
73 struct list_head service_conns; /* Service conns in this namespace */
74 rwlock_t conn_lock; /* Lock for ->conn_proc_list, ->service_conns */
75 struct work_struct service_conn_reaper;
76 struct timer_list service_conn_reap_timer;
77
78 bool live;
79
80 atomic_t nr_client_conns;
81
82 struct hlist_head local_endpoints;
83 struct mutex local_mutex; /* Lock for ->local_endpoints */
84
85 DECLARE_HASHTABLE (peer_hash, 10);
86 spinlock_t peer_hash_lock; /* Lock for ->peer_hash */
87
88 #define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
89 u8 peer_keepalive_cursor;
90 time64_t peer_keepalive_base;
91 struct list_head peer_keepalive[32];
92 struct list_head peer_keepalive_new;
93 struct timer_list peer_keepalive_timer;
94 struct work_struct peer_keepalive_work;
95
96 atomic_t stat_tx_data;
97 atomic_t stat_tx_data_retrans;
98 atomic_t stat_tx_data_send;
99 atomic_t stat_tx_data_send_frag;
100 atomic_t stat_tx_data_send_fail;
101 atomic_t stat_tx_data_underflow;
102 atomic_t stat_tx_data_cwnd_reset;
103 atomic_t stat_rx_data;
104 atomic_t stat_rx_data_reqack;
105 atomic_t stat_rx_data_jumbo;
106
107 atomic_t stat_tx_ack_fill;
108 atomic_t stat_tx_ack_send;
109 atomic_t stat_tx_ack_skip;
110 atomic_t stat_tx_acks[256];
111 atomic_t stat_rx_acks[256];
112
113 atomic_t stat_why_req_ack[8];
114
115 atomic_t stat_io_loop;
116 };
117
118 /*
119 * Service backlog preallocation.
120 *
121 * This contains circular buffers of preallocated peers, connections and calls
122 * for incoming service calls and their head and tail pointers. This allows
123 * calls to be set up in the data_ready handler, thereby avoiding the need to
124 * shuffle packets around so much.
125 */
126 struct rxrpc_backlog {
127 unsigned short peer_backlog_head;
128 unsigned short peer_backlog_tail;
129 unsigned short conn_backlog_head;
130 unsigned short conn_backlog_tail;
131 unsigned short call_backlog_head;
132 unsigned short call_backlog_tail;
133 #define RXRPC_BACKLOG_MAX 32
134 struct rxrpc_peer *peer_backlog[RXRPC_BACKLOG_MAX];
135 struct rxrpc_connection *conn_backlog[RXRPC_BACKLOG_MAX];
136 struct rxrpc_call *call_backlog[RXRPC_BACKLOG_MAX];
137 };
138
139 /*
140 * RxRPC socket definition
141 */
142 struct rxrpc_sock {
143 /* WARNING: sk has to be the first member */
144 struct sock sk;
145 rxrpc_notify_new_call_t notify_new_call; /* Func to notify of new call */
146 rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
147 struct rxrpc_local *local; /* local endpoint */
148 struct rxrpc_backlog *backlog; /* Preallocation for services */
149 spinlock_t incoming_lock; /* Incoming call vs service shutdown lock */
150 struct list_head sock_calls; /* List of calls owned by this socket */
151 struct list_head to_be_accepted; /* calls awaiting acceptance */
152 struct list_head recvmsg_q; /* Calls awaiting recvmsg's attention */
153 spinlock_t recvmsg_lock; /* Lock for recvmsg_q */
154 struct key *key; /* security for this socket */
155 struct key *securities; /* list of server security descriptors */
156 struct rb_root calls; /* User ID -> call mapping */
157 unsigned long flags;
158 #define RXRPC_SOCK_CONNECTED 0 /* connect_srx is set */
159 rwlock_t call_lock; /* lock for calls */
160 u32 min_sec_level; /* minimum security level */
161 #define RXRPC_SECURITY_MAX RXRPC_SECURITY_ENCRYPT
162 bool exclusive; /* Exclusive connection for a client socket */
163 u16 second_service; /* Additional service bound to the endpoint */
164 struct {
165 /* Service upgrade information */
166 u16 from; /* Service ID to upgrade (if not 0) */
167 u16 to; /* service ID to upgrade to */
168 } service_upgrade;
169 sa_family_t family; /* Protocol family created with */
170 struct sockaddr_rxrpc srx; /* Primary Service/local addresses */
171 struct sockaddr_rxrpc connect_srx; /* Default client address from connect() */
172 };
173
174 #define rxrpc_sk(__sk) container_of((__sk), struct rxrpc_sock, sk)
175
176 /*
177 * CPU-byteorder normalised Rx packet header.
178 */
179 struct rxrpc_host_header {
180 u32 epoch; /* client boot timestamp */
181 u32 cid; /* connection and channel ID */
182 u32 callNumber; /* call ID (0 for connection-level packets) */
183 u32 seq; /* sequence number of pkt in call stream */
184 u32 serial; /* serial number of pkt sent to network */
185 u8 type; /* packet type */
186 u8 flags; /* packet flags */
187 u8 userStatus; /* app-layer defined status */
188 u8 securityIndex; /* security protocol ID */
189 union {
190 u16 _rsvd; /* reserved */
191 u16 cksum; /* kerberos security checksum */
192 };
193 u16 serviceId; /* service ID */
194 } __packed;
195
196 /*
197 * RxRPC socket buffer private variables
198 * - max 48 bytes (struct sk_buff::cb)
199 */
200 struct rxrpc_skb_priv {
201 union {
202 struct rxrpc_connection *conn; /* Connection referred to (poke packet) */
203 struct {
204 u16 offset; /* Offset of data */
205 u16 len; /* Length of data */
206 u8 flags;
207 #define RXRPC_RX_VERIFIED 0x01
208 };
209 struct {
210 rxrpc_seq_t first_ack; /* First packet in acks table */
211 rxrpc_seq_t prev_ack; /* Highest seq seen */
212 rxrpc_serial_t acked_serial; /* Packet in response to (or 0) */
213 u8 reason; /* Reason for ack */
214 u8 nr_acks; /* Number of acks+nacks */
215 u8 nr_nacks; /* Number of nacks */
216 } ack;
217 };
218 struct rxrpc_host_header hdr; /* RxRPC packet header from this packet */
219 };
220
221 #define rxrpc_skb(__skb) ((struct rxrpc_skb_priv *) &(__skb)->cb)
222
223 /*
224 * RxRPC security module interface
225 */
226 struct rxrpc_security {
227 const char *name; /* name of this service */
228 u8 security_index; /* security type provided */
229 u32 no_key_abort; /* Abort code indicating no key */
230
231 /* Initialise a security service */
232 int (*init)(void);
233
234 /* Clean up a security service */
235 void (*exit)(void);
236
237 /* Parse the information from a server key */
238 int (*preparse_server_key)(struct key_preparsed_payload *);
239
240 /* Clean up the preparse buffer after parsing a server key */
241 void (*free_preparse_server_key)(struct key_preparsed_payload *);
242
243 /* Destroy the payload of a server key */
244 void (*destroy_server_key)(struct key *);
245
246 /* Describe a server key */
247 void (*describe_server_key)(const struct key *, struct seq_file *);
248
249 /* initialise a connection's security */
250 int (*init_connection_security)(struct rxrpc_connection *,
251 struct rxrpc_key_token *);
252
253 /* Work out how much data we can store in a packet, given an estimate
254 * of the amount of data remaining and allocate a data buffer.
255 */
256 struct rxrpc_txbuf *(*alloc_txbuf)(struct rxrpc_call *call, size_t remaining, gfp_t gfp);
257
258 /* impose security on a packet */
259 int (*secure_packet)(struct rxrpc_call *, struct rxrpc_txbuf *);
260
261 /* verify the security on a received packet */
262 int (*verify_packet)(struct rxrpc_call *, struct sk_buff *);
263
264 /* Free crypto request on a call */
265 void (*free_call_crypto)(struct rxrpc_call *);
266
267 /* issue a challenge */
268 int (*issue_challenge)(struct rxrpc_connection *);
269
270 /* respond to a challenge */
271 int (*respond_to_challenge)(struct rxrpc_connection *,
272 struct sk_buff *);
273
274 /* verify a response */
275 int (*verify_response)(struct rxrpc_connection *,
276 struct sk_buff *);
277
278 /* clear connection security */
279 void (*clear)(struct rxrpc_connection *);
280 };
281
282 /*
283 * RxRPC local transport endpoint description
284 * - owned by a single AF_RXRPC socket
285 * - pointed to by transport socket struct sk_user_data
286 */
287 struct rxrpc_local {
288 struct rcu_head rcu;
289 atomic_t active_users; /* Number of users of the local endpoint */
290 refcount_t ref; /* Number of references to the structure */
291 struct net *net; /* The network namespace */
292 struct rxrpc_net *rxnet; /* Our bits in the network namespace */
293 struct hlist_node link;
294 struct socket *socket; /* my UDP socket */
295 struct task_struct *io_thread;
296 struct completion io_thread_ready; /* Indication that the I/O thread started */
297 struct page_frag_cache tx_alloc; /* Tx control packet allocation (I/O thread only) */
298 struct rxrpc_sock *service; /* Service(s) listening on this endpoint */
299 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
300 struct sk_buff_head rx_delay_queue; /* Delay injection queue */
301 #endif
302 struct sk_buff_head rx_queue; /* Received packets */
303 struct list_head conn_attend_q; /* Conns requiring immediate attention */
304 struct list_head call_attend_q; /* Calls requiring immediate attention */
305
306 struct rb_root client_bundles; /* Client connection bundles by socket params */
307 spinlock_t client_bundles_lock; /* Lock for client_bundles */
308 bool kill_all_client_conns;
309 struct list_head idle_client_conns;
310 struct timer_list client_conn_reap_timer;
311 unsigned long client_conn_flags;
312 #define RXRPC_CLIENT_CONN_REAP_TIMER 0 /* The client conn reap timer expired */
313
314 spinlock_t lock; /* access lock */
315 rwlock_t services_lock; /* lock for services list */
316 int debug_id; /* debug ID for printks */
317 bool dead;
318 bool service_closed; /* Service socket closed */
319 struct idr conn_ids; /* List of connection IDs */
320 struct list_head new_client_calls; /* Newly created client calls need connection */
321 spinlock_t client_call_lock; /* Lock for ->new_client_calls */
322 struct sockaddr_rxrpc srx; /* local address */
323 };
324
325 /*
326 * RxRPC remote transport endpoint definition
327 * - matched by local endpoint, remote port, address and protocol type
328 */
329 struct rxrpc_peer {
330 struct rcu_head rcu; /* This must be first */
331 refcount_t ref;
332 unsigned long hash_key;
333 struct hlist_node hash_link;
334 struct rxrpc_local *local;
335 struct hlist_head error_targets; /* targets for net error distribution */
336 struct rb_root service_conns; /* Service connections */
337 struct list_head keepalive_link; /* Link in net->peer_keepalive[] */
338 time64_t last_tx_at; /* Last time packet sent here */
339 seqlock_t service_conn_lock;
340 spinlock_t lock; /* access lock */
341 unsigned int if_mtu; /* interface MTU for this peer */
342 unsigned int mtu; /* network MTU for this peer */
343 unsigned int maxdata; /* data size (MTU - hdrsize) */
344 unsigned short hdrsize; /* header size (IP + UDP + RxRPC) */
345 int debug_id; /* debug ID for printks */
346 struct sockaddr_rxrpc srx; /* remote address */
347
348 /* calculated RTT cache */
349 #define RXRPC_RTT_CACHE_SIZE 32
350 spinlock_t rtt_input_lock; /* RTT lock for input routine */
351 ktime_t rtt_last_req; /* Time of last RTT request */
352 unsigned int rtt_count; /* Number of samples we've got */
353
354 u32 srtt_us; /* smoothed round trip time << 3 in usecs */
355 u32 mdev_us; /* medium deviation */
356 u32 mdev_max_us; /* maximal mdev for the last rtt period */
357 u32 rttvar_us; /* smoothed mdev_max */
358 u32 rto_us; /* Retransmission timeout in usec */
359 u8 backoff; /* Backoff timeout (as shift) */
360
361 u8 cong_ssthresh; /* Congestion slow-start threshold */
362 };
363
364 /*
365 * Keys for matching a connection.
366 */
367 struct rxrpc_conn_proto {
368 union {
369 struct {
370 u32 epoch; /* epoch of this connection */
371 u32 cid; /* connection ID */
372 };
373 u64 index_key;
374 };
375 };
376
377 struct rxrpc_conn_parameters {
378 struct rxrpc_local *local; /* Representation of local endpoint */
379 struct rxrpc_peer *peer; /* Representation of remote endpoint */
380 struct key *key; /* Security details */
381 bool exclusive; /* T if conn is exclusive */
382 bool upgrade; /* T if service ID can be upgraded */
383 u16 service_id; /* Service ID for this connection */
384 u32 security_level; /* Security level selected */
385 };
386
387 /*
388 * Call completion condition (state == RXRPC_CALL_COMPLETE).
389 */
390 enum rxrpc_call_completion {
391 RXRPC_CALL_SUCCEEDED, /* - Normal termination */
392 RXRPC_CALL_REMOTELY_ABORTED, /* - call aborted by peer */
393 RXRPC_CALL_LOCALLY_ABORTED, /* - call aborted locally on error or close */
394 RXRPC_CALL_LOCAL_ERROR, /* - call failed due to local error */
395 RXRPC_CALL_NETWORK_ERROR, /* - call terminated by network error */
396 NR__RXRPC_CALL_COMPLETIONS
397 };
398
399 /*
400 * Bits in the connection flags.
401 */
402 enum rxrpc_conn_flag {
403 RXRPC_CONN_IN_SERVICE_CONNS, /* Conn is in peer->service_conns */
404 RXRPC_CONN_DONT_REUSE, /* Don't reuse this connection */
405 RXRPC_CONN_PROBING_FOR_UPGRADE, /* Probing for service upgrade */
406 RXRPC_CONN_FINAL_ACK_0, /* Need final ACK for channel 0 */
407 RXRPC_CONN_FINAL_ACK_1, /* Need final ACK for channel 1 */
408 RXRPC_CONN_FINAL_ACK_2, /* Need final ACK for channel 2 */
409 RXRPC_CONN_FINAL_ACK_3, /* Need final ACK for channel 3 */
410 };
411
412 #define RXRPC_CONN_FINAL_ACK_MASK ((1UL << RXRPC_CONN_FINAL_ACK_0) | \
413 (1UL << RXRPC_CONN_FINAL_ACK_1) | \
414 (1UL << RXRPC_CONN_FINAL_ACK_2) | \
415 (1UL << RXRPC_CONN_FINAL_ACK_3))
416
417 /*
418 * Events that can be raised upon a connection.
419 */
420 enum rxrpc_conn_event {
421 RXRPC_CONN_EV_CHALLENGE, /* Send challenge packet */
422 RXRPC_CONN_EV_ABORT_CALLS, /* Abort attached calls */
423 };
424
425 /*
426 * The connection protocol state.
427 */
428 enum rxrpc_conn_proto_state {
429 RXRPC_CONN_UNUSED, /* Connection not yet attempted */
430 RXRPC_CONN_CLIENT_UNSECURED, /* Client connection needs security init */
431 RXRPC_CONN_CLIENT, /* Client connection */
432 RXRPC_CONN_SERVICE_PREALLOC, /* Service connection preallocation */
433 RXRPC_CONN_SERVICE_UNSECURED, /* Service unsecured connection */
434 RXRPC_CONN_SERVICE_CHALLENGING, /* Service challenging for security */
435 RXRPC_CONN_SERVICE, /* Service secured connection */
436 RXRPC_CONN_ABORTED, /* Conn aborted */
437 RXRPC_CONN__NR_STATES
438 };
439
440 /*
441 * RxRPC client connection bundle.
442 */
443 struct rxrpc_bundle {
444 struct rxrpc_local *local; /* Representation of local endpoint */
445 struct rxrpc_peer *peer; /* Remote endpoint */
446 struct key *key; /* Security details */
447 struct list_head proc_link; /* Link in net->bundle_proc_list */
448 const struct rxrpc_security *security; /* applied security module */
449 refcount_t ref;
450 atomic_t active; /* Number of active users */
451 unsigned int debug_id;
452 u32 security_level; /* Security level selected */
453 u16 service_id; /* Service ID for this connection */
454 bool try_upgrade; /* True if the bundle is attempting upgrade */
455 bool exclusive; /* T if conn is exclusive */
456 bool upgrade; /* T if service ID can be upgraded */
457 unsigned short alloc_error; /* Error from last conn allocation */
458 struct rb_node local_node; /* Node in local->client_conns */
459 struct list_head waiting_calls; /* Calls waiting for channels */
460 unsigned long avail_chans; /* Mask of available channels */
461 unsigned int conn_ids[4]; /* Connection IDs. */
462 struct rxrpc_connection *conns[4]; /* The connections in the bundle (max 4) */
463 };
464
465 /*
466 * RxRPC connection definition
467 * - matched by { local, peer, epoch, conn_id, direction }
468 * - each connection can only handle four simultaneous calls
469 */
470 struct rxrpc_connection {
471 struct rxrpc_conn_proto proto;
472 struct rxrpc_local *local; /* Representation of local endpoint */
473 struct rxrpc_peer *peer; /* Remote endpoint */
474 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */
475 struct key *key; /* Security details */
476 struct list_head attend_link; /* Link in local->conn_attend_q */
477
478 refcount_t ref;
479 atomic_t active; /* Active count for service conns */
480 struct rcu_head rcu;
481 struct list_head cache_link;
482
483 unsigned char act_chans; /* Mask of active channels */
484 struct rxrpc_channel {
485 unsigned long final_ack_at; /* Time at which to issue final ACK */
486 struct rxrpc_call *call; /* Active call */
487 unsigned int call_debug_id; /* call->debug_id */
488 u32 call_id; /* ID of current call */
489 u32 call_counter; /* Call ID counter */
490 u32 last_call; /* ID of last call */
491 u8 last_type; /* Type of last packet */
492 union {
493 u32 last_seq;
494 u32 last_abort;
495 };
496 } channels[RXRPC_MAXCALLS];
497
498 struct timer_list timer; /* Conn event timer */
499 struct work_struct processor; /* connection event processor */
500 struct work_struct destructor; /* In-process-context destroyer */
501 struct rxrpc_bundle *bundle; /* Client connection bundle */
502 struct rb_node service_node; /* Node in peer->service_conns */
503 struct list_head proc_link; /* link in procfs list */
504 struct list_head link; /* link in master connection list */
505 struct sk_buff_head rx_queue; /* received conn-level packets */
506 struct page_frag_cache tx_data_alloc; /* Tx DATA packet allocation */
507 struct mutex tx_data_alloc_lock;
508
509 struct mutex security_lock; /* Lock for security management */
510 const struct rxrpc_security *security; /* applied security module */
511 union {
512 struct {
513 struct crypto_sync_skcipher *cipher; /* encryption handle */
514 struct rxrpc_crypt csum_iv; /* packet checksum base */
515 u32 nonce; /* response re-use preventer */
516 } rxkad;
517 };
518 unsigned long flags;
519 unsigned long events;
520 unsigned long idle_timestamp; /* Time at which last became idle */
521 spinlock_t state_lock; /* state-change lock */
522 enum rxrpc_conn_proto_state state; /* current state of connection */
523 enum rxrpc_call_completion completion; /* Completion condition */
524 s32 abort_code; /* Abort code of connection abort */
525 int debug_id; /* debug ID for printks */
526 rxrpc_serial_t tx_serial; /* Outgoing packet serial number counter */
527 unsigned int hi_serial; /* highest serial number received */
528 u32 service_id; /* Service ID, possibly upgraded */
529 u32 security_level; /* Security level selected */
530 u8 security_ix; /* security type */
531 u8 out_clientflag; /* RXRPC_CLIENT_INITIATED if we are client */
532 u8 bundle_shift; /* Index into bundle->avail_chans */
533 bool exclusive; /* T if conn is exclusive */
534 bool upgrade; /* T if service ID can be upgraded */
535 u16 orig_service_id; /* Originally requested service ID */
536 short error; /* Local error code */
537 };
538
rxrpc_to_server(const struct rxrpc_skb_priv * sp)539 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
540 {
541 return sp->hdr.flags & RXRPC_CLIENT_INITIATED;
542 }
543
rxrpc_to_client(const struct rxrpc_skb_priv * sp)544 static inline bool rxrpc_to_client(const struct rxrpc_skb_priv *sp)
545 {
546 return !rxrpc_to_server(sp);
547 }
548
549 /*
550 * Flags in call->flags.
551 */
552 enum rxrpc_call_flag {
553 RXRPC_CALL_RELEASED, /* call has been released - no more message to userspace */
554 RXRPC_CALL_HAS_USERID, /* has a user ID attached */
555 RXRPC_CALL_IS_SERVICE, /* Call is service call */
556 RXRPC_CALL_EXPOSED, /* The call was exposed to the world */
557 RXRPC_CALL_RX_LAST, /* Received the last packet (at rxtx_top) */
558 RXRPC_CALL_TX_LAST, /* Last packet in Tx buffer (at rxtx_top) */
559 RXRPC_CALL_TX_ALL_ACKED, /* Last packet has been hard-acked */
560 RXRPC_CALL_SEND_PING, /* A ping will need to be sent */
561 RXRPC_CALL_RETRANS_TIMEOUT, /* Retransmission due to timeout occurred */
562 RXRPC_CALL_BEGAN_RX_TIMER, /* We began the expect_rx_by timer */
563 RXRPC_CALL_RX_HEARD, /* The peer responded at least once to this call */
564 RXRPC_CALL_DISCONNECTED, /* The call has been disconnected */
565 RXRPC_CALL_KERNEL, /* The call was made by the kernel */
566 RXRPC_CALL_UPGRADE, /* Service upgrade was requested for the call */
567 RXRPC_CALL_EXCLUSIVE, /* The call uses a once-only connection */
568 RXRPC_CALL_RX_IS_IDLE, /* recvmsg() is idle - send an ACK */
569 RXRPC_CALL_RECVMSG_READ_ALL, /* recvmsg() read all of the received data */
570 };
571
572 /*
573 * Events that can be raised on a call.
574 */
575 enum rxrpc_call_event {
576 RXRPC_CALL_EV_ACK_LOST, /* ACK may be lost, send ping */
577 RXRPC_CALL_EV_INITIAL_PING, /* Send initial ping for a new service call */
578 };
579
580 /*
581 * The states that a call can be in.
582 */
583 enum rxrpc_call_state {
584 RXRPC_CALL_UNINITIALISED,
585 RXRPC_CALL_CLIENT_AWAIT_CONN, /* - client waiting for connection to become available */
586 RXRPC_CALL_CLIENT_SEND_REQUEST, /* - client sending request phase */
587 RXRPC_CALL_CLIENT_AWAIT_REPLY, /* - client awaiting reply */
588 RXRPC_CALL_CLIENT_RECV_REPLY, /* - client receiving reply phase */
589 RXRPC_CALL_SERVER_PREALLOC, /* - service preallocation */
590 RXRPC_CALL_SERVER_SECURING, /* - server securing request connection */
591 RXRPC_CALL_SERVER_RECV_REQUEST, /* - server receiving request */
592 RXRPC_CALL_SERVER_ACK_REQUEST, /* - server pending ACK of request */
593 RXRPC_CALL_SERVER_SEND_REPLY, /* - server sending reply */
594 RXRPC_CALL_SERVER_AWAIT_ACK, /* - server awaiting final ACK */
595 RXRPC_CALL_COMPLETE, /* - call complete */
596 NR__RXRPC_CALL_STATES
597 };
598
599 /*
600 * Call Tx congestion management modes.
601 */
602 enum rxrpc_congest_mode {
603 RXRPC_CALL_SLOW_START,
604 RXRPC_CALL_CONGEST_AVOIDANCE,
605 RXRPC_CALL_PACKET_LOSS,
606 RXRPC_CALL_FAST_RETRANSMIT,
607 NR__RXRPC_CONGEST_MODES
608 };
609
610 /*
611 * RxRPC call definition
612 * - matched by { connection, call_id }
613 */
614 struct rxrpc_call {
615 struct rcu_head rcu;
616 struct rxrpc_connection *conn; /* connection carrying call */
617 struct rxrpc_bundle *bundle; /* Connection bundle to use */
618 struct rxrpc_peer *peer; /* Peer record for remote address */
619 struct rxrpc_local *local; /* Representation of local endpoint */
620 struct rxrpc_sock __rcu *socket; /* socket responsible */
621 struct rxrpc_net *rxnet; /* Network namespace to which call belongs */
622 struct key *key; /* Security details */
623 const struct rxrpc_security *security; /* applied security module */
624 struct mutex user_mutex; /* User access mutex */
625 struct sockaddr_rxrpc dest_srx; /* Destination address */
626 ktime_t delay_ack_at; /* When DELAY ACK needs to happen */
627 ktime_t ack_lost_at; /* When ACK is figured as lost */
628 ktime_t resend_at; /* When next resend needs to happen */
629 ktime_t ping_at; /* When next to send a ping */
630 ktime_t keepalive_at; /* When next to send a keepalive ping */
631 ktime_t expect_rx_by; /* When we expect to get a packet by */
632 ktime_t expect_req_by; /* When we expect to get a request DATA packet by */
633 ktime_t expect_term_by; /* When we expect call termination by */
634 u32 next_rx_timo; /* Timeout for next Rx packet (ms) */
635 u32 next_req_timo; /* Timeout for next Rx request packet (ms) */
636 u32 hard_timo; /* Maximum lifetime or 0 (s) */
637 struct timer_list timer; /* Combined event timer */
638 struct work_struct destroyer; /* In-process-context destroyer */
639 rxrpc_notify_rx_t notify_rx; /* kernel service Rx notification function */
640 struct list_head link; /* link in master call list */
641 struct list_head wait_link; /* Link in local->new_client_calls */
642 struct hlist_node error_link; /* link in error distribution list */
643 struct list_head accept_link; /* Link in rx->acceptq */
644 struct list_head recvmsg_link; /* Link in rx->recvmsg_q */
645 struct list_head sock_link; /* Link in rx->sock_calls */
646 struct rb_node sock_node; /* Node in rx->calls */
647 struct list_head attend_link; /* Link in local->call_attend_q */
648 struct rxrpc_txbuf *tx_pending; /* Tx buffer being filled */
649 wait_queue_head_t waitq; /* Wait queue for channel or Tx */
650 s64 tx_total_len; /* Total length left to be transmitted (or -1) */
651 unsigned long user_call_ID; /* user-defined call ID */
652 unsigned long flags;
653 unsigned long events;
654 spinlock_t notify_lock; /* Kernel notification lock */
655 unsigned int send_abort_why; /* Why the abort [enum rxrpc_abort_reason] */
656 s32 send_abort; /* Abort code to be sent */
657 short send_abort_err; /* Error to be associated with the abort */
658 rxrpc_seq_t send_abort_seq; /* DATA packet that incurred the abort (or 0) */
659 s32 abort_code; /* Local/remote abort code */
660 int error; /* Local error incurred */
661 enum rxrpc_call_state _state; /* Current state of call (needs barrier) */
662 enum rxrpc_call_completion completion; /* Call completion condition */
663 refcount_t ref;
664 u8 security_ix; /* Security type */
665 enum rxrpc_interruptibility interruptibility; /* At what point call may be interrupted */
666 u32 call_id; /* call ID on connection */
667 u32 cid; /* connection ID plus channel index */
668 u32 security_level; /* Security level selected */
669 int debug_id; /* debug ID for printks */
670 unsigned short rx_pkt_offset; /* Current recvmsg packet offset */
671 unsigned short rx_pkt_len; /* Current recvmsg packet len */
672
673 /* Transmitted data tracking. */
674 spinlock_t tx_lock; /* Transmit queue lock */
675 struct list_head tx_sendmsg; /* Sendmsg prepared packets */
676 struct list_head tx_buffer; /* Buffer of transmissible packets */
677 rxrpc_seq_t tx_bottom; /* First packet in buffer */
678 rxrpc_seq_t tx_transmitted; /* Highest packet transmitted */
679 rxrpc_seq_t tx_prepared; /* Highest Tx slot prepared. */
680 rxrpc_seq_t tx_top; /* Highest Tx slot allocated. */
681 u16 tx_backoff; /* Delay to insert due to Tx failure (ms) */
682 u8 tx_winsize; /* Maximum size of Tx window */
683 #define RXRPC_TX_MAX_WINDOW 128
684 ktime_t tx_last_sent; /* Last time a transmission occurred */
685
686 /* Received data tracking */
687 struct sk_buff_head recvmsg_queue; /* Queue of packets ready for recvmsg() */
688 struct sk_buff_head rx_oos_queue; /* Queue of out of sequence packets */
689
690 rxrpc_seq_t rx_highest_seq; /* Higest sequence number received */
691 rxrpc_seq_t rx_consumed; /* Highest packet consumed */
692 rxrpc_serial_t rx_serial; /* Highest serial received for this call */
693 u8 rx_winsize; /* Size of Rx window */
694
695 /* TCP-style slow-start congestion control [RFC5681]. Since the SMSS
696 * is fixed, we keep these numbers in terms of segments (ie. DATA
697 * packets) rather than bytes.
698 */
699 #define RXRPC_TX_SMSS RXRPC_JUMBO_DATALEN
700 #define RXRPC_MIN_CWND 4
701 u8 cong_cwnd; /* Congestion window size */
702 u8 cong_extra; /* Extra to send for congestion management */
703 u8 cong_ssthresh; /* Slow-start threshold */
704 enum rxrpc_congest_mode cong_mode:8; /* Congestion management mode */
705 u8 cong_dup_acks; /* Count of ACKs showing missing packets */
706 u8 cong_cumul_acks; /* Cumulative ACK count */
707 ktime_t cong_tstamp; /* Last time cwnd was changed */
708 struct sk_buff *cong_last_nack; /* Last ACK with nacks received */
709
710 /* Receive-phase ACK management (ACKs we send). */
711 u8 ackr_reason; /* reason to ACK */
712 u16 ackr_sack_base; /* Starting slot in SACK table ring */
713 rxrpc_seq_t ackr_window; /* Base of SACK window */
714 rxrpc_seq_t ackr_wtop; /* Base of SACK window */
715 unsigned int ackr_nr_unacked; /* Number of unacked packets */
716 atomic_t ackr_nr_consumed; /* Number of packets needing hard ACK */
717 struct {
718 #define RXRPC_SACK_SIZE 256
719 /* SACK table for soft-acked packets */
720 u8 ackr_sack_table[RXRPC_SACK_SIZE];
721 } __aligned(8);
722
723 /* RTT management */
724 rxrpc_serial_t rtt_serial[4]; /* Serial number of DATA or PING sent */
725 ktime_t rtt_sent_at[4]; /* Time packet sent */
726 unsigned long rtt_avail; /* Mask of available slots in bits 0-3,
727 * Mask of pending samples in 8-11 */
728 #define RXRPC_CALL_RTT_AVAIL_MASK 0xf
729 #define RXRPC_CALL_RTT_PEND_SHIFT 8
730
731 /* Transmission-phase ACK management (ACKs we've received). */
732 ktime_t acks_latest_ts; /* Timestamp of latest ACK received */
733 rxrpc_seq_t acks_first_seq; /* first sequence number received */
734 rxrpc_seq_t acks_prev_seq; /* Highest previousPacket received */
735 rxrpc_seq_t acks_hard_ack; /* Latest hard-ack point */
736 rxrpc_seq_t acks_lowest_nak; /* Lowest NACK in the buffer (or ==tx_hard_ack) */
737 rxrpc_serial_t acks_highest_serial; /* Highest serial number ACK'd */
738 };
739
740 /*
741 * Summary of a new ACK and the changes it made to the Tx buffer packet states.
742 */
743 struct rxrpc_ack_summary {
744 u16 nr_acks; /* Number of ACKs in packet */
745 u16 nr_new_acks; /* Number of new ACKs in packet */
746 u16 nr_new_nacks; /* Number of new nacks in packet */
747 u16 nr_retained_nacks; /* Number of nacks retained between ACKs */
748 u8 ack_reason;
749 bool saw_nacks; /* Saw NACKs in packet */
750 bool new_low_nack; /* T if new low NACK found */
751 bool retrans_timeo; /* T if reTx due to timeout happened */
752 u8 flight_size; /* Number of unreceived transmissions */
753 /* Place to stash values for tracing */
754 enum rxrpc_congest_mode mode:8;
755 u8 cwnd;
756 u8 ssthresh;
757 u8 dup_acks;
758 u8 cumulative_acks;
759 };
760
761 /*
762 * sendmsg() cmsg-specified parameters.
763 */
764 enum rxrpc_command {
765 RXRPC_CMD_SEND_DATA, /* send data message */
766 RXRPC_CMD_SEND_ABORT, /* request abort generation */
767 RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */
768 RXRPC_CMD_CHARGE_ACCEPT, /* [server] charge accept preallocation */
769 };
770
771 struct rxrpc_call_params {
772 s64 tx_total_len; /* Total Tx data length (if send data) */
773 unsigned long user_call_ID; /* User's call ID */
774 struct {
775 u32 hard; /* Maximum lifetime (sec) */
776 u32 idle; /* Max time since last data packet (msec) */
777 u32 normal; /* Max time since last call packet (msec) */
778 } timeouts;
779 u8 nr_timeouts; /* Number of timeouts specified */
780 bool kernel; /* T if kernel is making the call */
781 enum rxrpc_interruptibility interruptibility; /* How is interruptible is the call? */
782 };
783
784 struct rxrpc_send_params {
785 struct rxrpc_call_params call;
786 u32 abort_code; /* Abort code to Tx (if abort) */
787 enum rxrpc_command command : 8; /* The command to implement */
788 bool exclusive; /* Shared or exclusive call */
789 bool upgrade; /* If the connection is upgradeable */
790 };
791
792 /*
793 * Buffer of data to be output as a packet.
794 */
795 struct rxrpc_txbuf {
796 struct list_head call_link; /* Link in call->tx_sendmsg/tx_buffer */
797 struct list_head tx_link; /* Link in live Enc queue or Tx queue */
798 ktime_t last_sent; /* Time at which last transmitted */
799 refcount_t ref;
800 rxrpc_seq_t seq; /* Sequence number of this packet */
801 rxrpc_serial_t serial; /* Last serial number transmitted with */
802 unsigned int call_debug_id;
803 unsigned int debug_id;
804 unsigned int len; /* Amount of data in buffer */
805 unsigned int space; /* Remaining data space */
806 unsigned int offset; /* Offset of fill point */
807 unsigned int flags;
808 #define RXRPC_TXBUF_WIRE_FLAGS 0xff /* The wire protocol flags */
809 #define RXRPC_TXBUF_RESENT 0x100 /* Set if has been resent */
810 __be16 cksum; /* Checksum to go in header */
811 unsigned short ack_rwind; /* ACK receive window */
812 u8 /*enum rxrpc_propose_ack_trace*/ ack_why; /* If ack, why */
813 u8 nr_kvec; /* Amount of kvec[] used */
814 struct kvec kvec[3];
815 };
816
rxrpc_sending_to_server(const struct rxrpc_txbuf * txb)817 static inline bool rxrpc_sending_to_server(const struct rxrpc_txbuf *txb)
818 {
819 return txb->flags & RXRPC_CLIENT_INITIATED;
820 }
821
rxrpc_sending_to_client(const struct rxrpc_txbuf * txb)822 static inline bool rxrpc_sending_to_client(const struct rxrpc_txbuf *txb)
823 {
824 return !rxrpc_sending_to_server(txb);
825 }
826
827 #include <trace/events/rxrpc.h>
828
829 /*
830 * Allocate the next serial number on a connection. 0 must be skipped.
831 */
rxrpc_get_next_serial(struct rxrpc_connection * conn)832 static inline rxrpc_serial_t rxrpc_get_next_serial(struct rxrpc_connection *conn)
833 {
834 rxrpc_serial_t serial;
835
836 serial = conn->tx_serial;
837 if (serial == 0)
838 serial = 1;
839 conn->tx_serial = serial + 1;
840 return serial;
841 }
842
843 /*
844 * af_rxrpc.c
845 */
846 extern atomic_t rxrpc_n_rx_skbs;
847 extern struct workqueue_struct *rxrpc_workqueue;
848
849 /*
850 * call_accept.c
851 */
852 int rxrpc_service_prealloc(struct rxrpc_sock *, gfp_t);
853 void rxrpc_discard_prealloc(struct rxrpc_sock *);
854 bool rxrpc_new_incoming_call(struct rxrpc_local *local,
855 struct rxrpc_peer *peer,
856 struct rxrpc_connection *conn,
857 struct sockaddr_rxrpc *peer_srx,
858 struct sk_buff *skb);
859 void rxrpc_accept_incoming_calls(struct rxrpc_local *);
860 int rxrpc_user_charge_accept(struct rxrpc_sock *, unsigned long);
861
862 /*
863 * call_event.c
864 */
865 void rxrpc_propose_ping(struct rxrpc_call *call, u32 serial,
866 enum rxrpc_propose_ack_trace why);
867 void rxrpc_propose_delay_ACK(struct rxrpc_call *, rxrpc_serial_t,
868 enum rxrpc_propose_ack_trace);
869 void rxrpc_shrink_call_tx_buffer(struct rxrpc_call *);
870 void rxrpc_resend(struct rxrpc_call *call, struct sk_buff *ack_skb);
871
872 bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb);
873
874 /*
875 * call_object.c
876 */
877 extern const char *const rxrpc_call_states[];
878 extern const char *const rxrpc_call_completions[];
879 extern struct kmem_cache *rxrpc_call_jar;
880
881 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what);
882 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
883 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *, gfp_t, unsigned int);
884 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
885 struct rxrpc_conn_parameters *,
886 struct rxrpc_call_params *, gfp_t,
887 unsigned int);
888 void rxrpc_start_call_timer(struct rxrpc_call *call);
889 void rxrpc_incoming_call(struct rxrpc_sock *, struct rxrpc_call *,
890 struct sk_buff *);
891 void rxrpc_release_call(struct rxrpc_sock *, struct rxrpc_call *);
892 void rxrpc_release_calls_on_socket(struct rxrpc_sock *);
893 void rxrpc_see_call(struct rxrpc_call *, enum rxrpc_call_trace);
894 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
895 void rxrpc_get_call(struct rxrpc_call *, enum rxrpc_call_trace);
896 void rxrpc_put_call(struct rxrpc_call *, enum rxrpc_call_trace);
897 void rxrpc_cleanup_call(struct rxrpc_call *);
898 void rxrpc_destroy_all_calls(struct rxrpc_net *);
899
rxrpc_is_service_call(const struct rxrpc_call * call)900 static inline bool rxrpc_is_service_call(const struct rxrpc_call *call)
901 {
902 return test_bit(RXRPC_CALL_IS_SERVICE, &call->flags);
903 }
904
rxrpc_is_client_call(const struct rxrpc_call * call)905 static inline bool rxrpc_is_client_call(const struct rxrpc_call *call)
906 {
907 return !rxrpc_is_service_call(call);
908 }
909
910 /*
911 * call_state.c
912 */
913 bool rxrpc_set_call_completion(struct rxrpc_call *call,
914 enum rxrpc_call_completion compl,
915 u32 abort_code,
916 int error);
917 bool rxrpc_call_completed(struct rxrpc_call *call);
918 bool rxrpc_abort_call(struct rxrpc_call *call, rxrpc_seq_t seq,
919 u32 abort_code, int error, enum rxrpc_abort_reason why);
920 void rxrpc_prefail_call(struct rxrpc_call *call, enum rxrpc_call_completion compl,
921 int error);
922
rxrpc_set_call_state(struct rxrpc_call * call,enum rxrpc_call_state state)923 static inline void rxrpc_set_call_state(struct rxrpc_call *call,
924 enum rxrpc_call_state state)
925 {
926 /* Order write of completion info before write of ->state. */
927 smp_store_release(&call->_state, state);
928 wake_up(&call->waitq);
929 }
930
__rxrpc_call_state(const struct rxrpc_call * call)931 static inline enum rxrpc_call_state __rxrpc_call_state(const struct rxrpc_call *call)
932 {
933 return call->_state; /* Only inside I/O thread */
934 }
935
__rxrpc_call_is_complete(const struct rxrpc_call * call)936 static inline bool __rxrpc_call_is_complete(const struct rxrpc_call *call)
937 {
938 return __rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
939 }
940
rxrpc_call_state(const struct rxrpc_call * call)941 static inline enum rxrpc_call_state rxrpc_call_state(const struct rxrpc_call *call)
942 {
943 /* Order read ->state before read of completion info. */
944 return smp_load_acquire(&call->_state);
945 }
946
rxrpc_call_is_complete(const struct rxrpc_call * call)947 static inline bool rxrpc_call_is_complete(const struct rxrpc_call *call)
948 {
949 return rxrpc_call_state(call) == RXRPC_CALL_COMPLETE;
950 }
951
rxrpc_call_has_failed(const struct rxrpc_call * call)952 static inline bool rxrpc_call_has_failed(const struct rxrpc_call *call)
953 {
954 return rxrpc_call_is_complete(call) && call->completion != RXRPC_CALL_SUCCEEDED;
955 }
956
957 /*
958 * conn_client.c
959 */
960 extern unsigned int rxrpc_reap_client_connections;
961 extern unsigned long rxrpc_conn_idle_client_expiry;
962 extern unsigned long rxrpc_conn_idle_client_fast_expiry;
963
964 void rxrpc_purge_client_connections(struct rxrpc_local *local);
965 struct rxrpc_bundle *rxrpc_get_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
966 void rxrpc_put_bundle(struct rxrpc_bundle *, enum rxrpc_bundle_trace);
967 int rxrpc_look_up_bundle(struct rxrpc_call *call, gfp_t gfp);
968 void rxrpc_connect_client_calls(struct rxrpc_local *local);
969 void rxrpc_expose_client_call(struct rxrpc_call *);
970 void rxrpc_disconnect_client_call(struct rxrpc_bundle *, struct rxrpc_call *);
971 void rxrpc_deactivate_bundle(struct rxrpc_bundle *bundle);
972 void rxrpc_put_client_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
973 void rxrpc_discard_expired_client_conns(struct rxrpc_local *local);
974 void rxrpc_clean_up_local_conns(struct rxrpc_local *);
975
976 /*
977 * conn_event.c
978 */
979 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb,
980 unsigned int channel);
981 int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb,
982 s32 abort_code, int err, enum rxrpc_abort_reason why);
983 void rxrpc_process_connection(struct work_struct *);
984 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
985 bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb);
986 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb);
987
rxrpc_is_conn_aborted(const struct rxrpc_connection * conn)988 static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn)
989 {
990 /* Order reading the abort info after the state check. */
991 return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED;
992 }
993
994 /*
995 * conn_object.c
996 */
997 extern unsigned int rxrpc_connection_expiry;
998 extern unsigned int rxrpc_closed_conn_expiry;
999
1000 void rxrpc_poke_conn(struct rxrpc_connection *conn, enum rxrpc_conn_trace why);
1001 struct rxrpc_connection *rxrpc_alloc_connection(struct rxrpc_net *, gfp_t);
1002 struct rxrpc_connection *rxrpc_find_client_connection_rcu(struct rxrpc_local *,
1003 struct sockaddr_rxrpc *,
1004 struct sk_buff *);
1005 void __rxrpc_disconnect_call(struct rxrpc_connection *, struct rxrpc_call *);
1006 void rxrpc_disconnect_call(struct rxrpc_call *);
1007 void rxrpc_kill_client_conn(struct rxrpc_connection *);
1008 void rxrpc_queue_conn(struct rxrpc_connection *, enum rxrpc_conn_trace);
1009 void rxrpc_see_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1010 struct rxrpc_connection *rxrpc_get_connection(struct rxrpc_connection *,
1011 enum rxrpc_conn_trace);
1012 struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *,
1013 enum rxrpc_conn_trace);
1014 void rxrpc_put_connection(struct rxrpc_connection *, enum rxrpc_conn_trace);
1015 void rxrpc_service_connection_reaper(struct work_struct *);
1016 void rxrpc_destroy_all_connections(struct rxrpc_net *);
1017
rxrpc_conn_is_client(const struct rxrpc_connection * conn)1018 static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
1019 {
1020 return conn->out_clientflag;
1021 }
1022
rxrpc_conn_is_service(const struct rxrpc_connection * conn)1023 static inline bool rxrpc_conn_is_service(const struct rxrpc_connection *conn)
1024 {
1025 return !rxrpc_conn_is_client(conn);
1026 }
1027
rxrpc_reduce_conn_timer(struct rxrpc_connection * conn,unsigned long expire_at)1028 static inline void rxrpc_reduce_conn_timer(struct rxrpc_connection *conn,
1029 unsigned long expire_at)
1030 {
1031 timer_reduce(&conn->timer, expire_at);
1032 }
1033
1034 /*
1035 * conn_service.c
1036 */
1037 struct rxrpc_connection *rxrpc_find_service_conn_rcu(struct rxrpc_peer *,
1038 struct sk_buff *);
1039 struct rxrpc_connection *rxrpc_prealloc_service_connection(struct rxrpc_net *, gfp_t);
1040 void rxrpc_new_incoming_connection(struct rxrpc_sock *, struct rxrpc_connection *,
1041 const struct rxrpc_security *, struct sk_buff *);
1042 void rxrpc_unpublish_service_conn(struct rxrpc_connection *);
1043
1044 /*
1045 * input.c
1046 */
1047 void rxrpc_congestion_degrade(struct rxrpc_call *);
1048 void rxrpc_input_call_packet(struct rxrpc_call *, struct sk_buff *);
1049 void rxrpc_implicit_end_call(struct rxrpc_call *, struct sk_buff *);
1050
1051 /*
1052 * io_thread.c
1053 */
1054 int rxrpc_encap_rcv(struct sock *, struct sk_buff *);
1055 void rxrpc_error_report(struct sock *);
1056 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
1057 s32 abort_code, int err);
1058 int rxrpc_io_thread(void *data);
rxrpc_wake_up_io_thread(struct rxrpc_local * local)1059 static inline void rxrpc_wake_up_io_thread(struct rxrpc_local *local)
1060 {
1061 wake_up_process(local->io_thread);
1062 }
1063
rxrpc_protocol_error(struct sk_buff * skb,enum rxrpc_abort_reason why)1064 static inline bool rxrpc_protocol_error(struct sk_buff *skb, enum rxrpc_abort_reason why)
1065 {
1066 return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EPROTO);
1067 }
1068
1069 /*
1070 * insecure.c
1071 */
1072 extern const struct rxrpc_security rxrpc_no_security;
1073
1074 /*
1075 * key.c
1076 */
1077 extern struct key_type key_type_rxrpc;
1078
1079 int rxrpc_request_key(struct rxrpc_sock *, sockptr_t , int);
1080 int rxrpc_get_server_data_key(struct rxrpc_connection *, const void *, time64_t,
1081 u32);
1082
1083 /*
1084 * local_event.c
1085 */
1086 void rxrpc_gen_version_string(void);
1087 void rxrpc_send_version_request(struct rxrpc_local *local,
1088 struct rxrpc_host_header *hdr,
1089 struct sk_buff *skb);
1090
1091 /*
1092 * local_object.c
1093 */
1094 void rxrpc_local_dont_fragment(const struct rxrpc_local *local, bool set);
1095 struct rxrpc_local *rxrpc_lookup_local(struct net *, const struct sockaddr_rxrpc *);
1096 struct rxrpc_local *rxrpc_get_local(struct rxrpc_local *, enum rxrpc_local_trace);
1097 struct rxrpc_local *rxrpc_get_local_maybe(struct rxrpc_local *, enum rxrpc_local_trace);
1098 void rxrpc_put_local(struct rxrpc_local *, enum rxrpc_local_trace);
1099 struct rxrpc_local *rxrpc_use_local(struct rxrpc_local *, enum rxrpc_local_trace);
1100 void rxrpc_unuse_local(struct rxrpc_local *, enum rxrpc_local_trace);
1101 void rxrpc_destroy_local(struct rxrpc_local *local);
1102 void rxrpc_destroy_all_locals(struct rxrpc_net *);
1103
__rxrpc_use_local(struct rxrpc_local * local,enum rxrpc_local_trace why)1104 static inline bool __rxrpc_use_local(struct rxrpc_local *local,
1105 enum rxrpc_local_trace why)
1106 {
1107 int r, u;
1108
1109 r = refcount_read(&local->ref);
1110 u = atomic_fetch_add_unless(&local->active_users, 1, 0);
1111 trace_rxrpc_local(local->debug_id, why, r, u);
1112 return u != 0;
1113 }
1114
rxrpc_see_local(struct rxrpc_local * local,enum rxrpc_local_trace why)1115 static inline void rxrpc_see_local(struct rxrpc_local *local,
1116 enum rxrpc_local_trace why)
1117 {
1118 int r, u;
1119
1120 r = refcount_read(&local->ref);
1121 u = atomic_read(&local->active_users);
1122 trace_rxrpc_local(local->debug_id, why, r, u);
1123 }
1124
1125 /*
1126 * misc.c
1127 */
1128 extern unsigned int rxrpc_max_backlog __read_mostly;
1129 extern unsigned long rxrpc_soft_ack_delay;
1130 extern unsigned long rxrpc_idle_ack_delay;
1131 extern unsigned int rxrpc_rx_window_size;
1132 extern unsigned int rxrpc_rx_mtu;
1133 extern unsigned int rxrpc_rx_jumbo_max;
1134 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
1135 extern unsigned long rxrpc_inject_rx_delay;
1136 #endif
1137
1138 /*
1139 * net_ns.c
1140 */
1141 extern unsigned int rxrpc_net_id;
1142 extern struct pernet_operations rxrpc_net_ops;
1143
rxrpc_net(struct net * net)1144 static inline struct rxrpc_net *rxrpc_net(struct net *net)
1145 {
1146 return net_generic(net, rxrpc_net_id);
1147 }
1148
1149 /*
1150 * output.c
1151 */
1152 void rxrpc_send_ACK(struct rxrpc_call *call, u8 ack_reason,
1153 rxrpc_serial_t serial, enum rxrpc_propose_ack_trace why);
1154 int rxrpc_send_abort_packet(struct rxrpc_call *);
1155 void rxrpc_send_conn_abort(struct rxrpc_connection *conn);
1156 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb);
1157 void rxrpc_send_keepalive(struct rxrpc_peer *);
1158 void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
1159
1160 /*
1161 * peer_event.c
1162 */
1163 void rxrpc_input_error(struct rxrpc_local *, struct sk_buff *);
1164 void rxrpc_peer_keepalive_worker(struct work_struct *);
1165
1166 /*
1167 * peer_object.c
1168 */
1169 struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *,
1170 const struct sockaddr_rxrpc *);
1171 struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_local *local,
1172 struct sockaddr_rxrpc *srx, gfp_t gfp);
1173 struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *, gfp_t,
1174 enum rxrpc_peer_trace);
1175 void rxrpc_new_incoming_peer(struct rxrpc_local *local, struct rxrpc_peer *peer);
1176 void rxrpc_destroy_all_peers(struct rxrpc_net *);
1177 struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1178 struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *, enum rxrpc_peer_trace);
1179 void rxrpc_put_peer(struct rxrpc_peer *, enum rxrpc_peer_trace);
1180
1181 /*
1182 * proc.c
1183 */
1184 extern const struct seq_operations rxrpc_call_seq_ops;
1185 extern const struct seq_operations rxrpc_connection_seq_ops;
1186 extern const struct seq_operations rxrpc_bundle_seq_ops;
1187 extern const struct seq_operations rxrpc_peer_seq_ops;
1188 extern const struct seq_operations rxrpc_local_seq_ops;
1189
1190 /*
1191 * recvmsg.c
1192 */
1193 void rxrpc_notify_socket(struct rxrpc_call *);
1194 int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
1195
1196 /*
1197 * Abort a call due to a protocol error.
1198 */
rxrpc_abort_eproto(struct rxrpc_call * call,struct sk_buff * skb,s32 abort_code,enum rxrpc_abort_reason why)1199 static inline int rxrpc_abort_eproto(struct rxrpc_call *call,
1200 struct sk_buff *skb,
1201 s32 abort_code,
1202 enum rxrpc_abort_reason why)
1203 {
1204 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
1205
1206 rxrpc_abort_call(call, sp->hdr.seq, abort_code, -EPROTO, why);
1207 return -EPROTO;
1208 }
1209
1210 /*
1211 * rtt.c
1212 */
1213 void rxrpc_peer_add_rtt(struct rxrpc_call *, enum rxrpc_rtt_rx_trace, int,
1214 rxrpc_serial_t, rxrpc_serial_t, ktime_t, ktime_t);
1215 ktime_t rxrpc_get_rto_backoff(struct rxrpc_peer *peer, bool retrans);
1216 void rxrpc_peer_init_rtt(struct rxrpc_peer *);
1217
1218 /*
1219 * rxkad.c
1220 */
1221 #ifdef CONFIG_RXKAD
1222 extern const struct rxrpc_security rxkad;
1223 #endif
1224
1225 /*
1226 * security.c
1227 */
1228 int __init rxrpc_init_security(void);
1229 const struct rxrpc_security *rxrpc_security_lookup(u8);
1230 void rxrpc_exit_security(void);
1231 int rxrpc_init_client_call_security(struct rxrpc_call *);
1232 int rxrpc_init_client_conn_security(struct rxrpc_connection *);
1233 const struct rxrpc_security *rxrpc_get_incoming_security(struct rxrpc_sock *,
1234 struct sk_buff *);
1235 struct key *rxrpc_look_up_server_security(struct rxrpc_connection *,
1236 struct sk_buff *, u32, u32);
1237
1238 /*
1239 * sendmsg.c
1240 */
1241 bool rxrpc_propose_abort(struct rxrpc_call *call, s32 abort_code, int error,
1242 enum rxrpc_abort_reason why);
1243 int rxrpc_do_sendmsg(struct rxrpc_sock *, struct msghdr *, size_t);
1244
1245 /*
1246 * server_key.c
1247 */
1248 extern struct key_type key_type_rxrpc_s;
1249
1250 int rxrpc_server_keyring(struct rxrpc_sock *, sockptr_t, int);
1251
1252 /*
1253 * skbuff.c
1254 */
1255 void rxrpc_kernel_data_consumed(struct rxrpc_call *, struct sk_buff *);
1256 void rxrpc_new_skb(struct sk_buff *, enum rxrpc_skb_trace);
1257 void rxrpc_see_skb(struct sk_buff *, enum rxrpc_skb_trace);
1258 void rxrpc_eaten_skb(struct sk_buff *, enum rxrpc_skb_trace);
1259 void rxrpc_get_skb(struct sk_buff *, enum rxrpc_skb_trace);
1260 void rxrpc_free_skb(struct sk_buff *, enum rxrpc_skb_trace);
1261 void rxrpc_purge_queue(struct sk_buff_head *);
1262
1263 /*
1264 * stats.c
1265 */
1266 int rxrpc_stats_show(struct seq_file *seq, void *v);
1267 int rxrpc_stats_clear(struct file *file, char *buf, size_t size);
1268
1269 #define rxrpc_inc_stat(rxnet, s) atomic_inc(&(rxnet)->s)
1270 #define rxrpc_dec_stat(rxnet, s) atomic_dec(&(rxnet)->s)
1271
1272 /*
1273 * sysctl.c
1274 */
1275 #ifdef CONFIG_SYSCTL
1276 extern int __init rxrpc_sysctl_init(void);
1277 extern void rxrpc_sysctl_exit(void);
1278 #else
rxrpc_sysctl_init(void)1279 static inline int __init rxrpc_sysctl_init(void) { return 0; }
rxrpc_sysctl_exit(void)1280 static inline void rxrpc_sysctl_exit(void) {}
1281 #endif
1282
1283 /*
1284 * txbuf.c
1285 */
1286 extern atomic_t rxrpc_nr_txbuf;
1287 struct rxrpc_txbuf *rxrpc_alloc_data_txbuf(struct rxrpc_call *call, size_t data_size,
1288 size_t data_align, gfp_t gfp);
1289 struct rxrpc_txbuf *rxrpc_alloc_ack_txbuf(struct rxrpc_call *call, size_t sack_size);
1290 void rxrpc_get_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1291 void rxrpc_see_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1292 void rxrpc_put_txbuf(struct rxrpc_txbuf *txb, enum rxrpc_txbuf_trace what);
1293
1294 /*
1295 * utils.c
1296 */
1297 int rxrpc_extract_addr_from_skb(struct sockaddr_rxrpc *, struct sk_buff *);
1298
before(u32 seq1,u32 seq2)1299 static inline bool before(u32 seq1, u32 seq2)
1300 {
1301 return (s32)(seq1 - seq2) < 0;
1302 }
before_eq(u32 seq1,u32 seq2)1303 static inline bool before_eq(u32 seq1, u32 seq2)
1304 {
1305 return (s32)(seq1 - seq2) <= 0;
1306 }
after(u32 seq1,u32 seq2)1307 static inline bool after(u32 seq1, u32 seq2)
1308 {
1309 return (s32)(seq1 - seq2) > 0;
1310 }
after_eq(u32 seq1,u32 seq2)1311 static inline bool after_eq(u32 seq1, u32 seq2)
1312 {
1313 return (s32)(seq1 - seq2) >= 0;
1314 }
1315
1316 /*
1317 * debug tracing
1318 */
1319 extern unsigned int rxrpc_debug;
1320
1321 #define dbgprintk(FMT,...) \
1322 printk("[%-6.6s] "FMT"\n", current->comm ,##__VA_ARGS__)
1323
1324 #define kenter(FMT,...) dbgprintk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1325 #define kleave(FMT,...) dbgprintk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1326 #define kdebug(FMT,...) dbgprintk(" "FMT ,##__VA_ARGS__)
1327
1328
1329 #if defined(__KDEBUG)
1330 #define _enter(FMT,...) kenter(FMT,##__VA_ARGS__)
1331 #define _leave(FMT,...) kleave(FMT,##__VA_ARGS__)
1332 #define _debug(FMT,...) kdebug(FMT,##__VA_ARGS__)
1333
1334 #elif defined(CONFIG_AF_RXRPC_DEBUG)
1335 #define RXRPC_DEBUG_KENTER 0x01
1336 #define RXRPC_DEBUG_KLEAVE 0x02
1337 #define RXRPC_DEBUG_KDEBUG 0x04
1338
1339 #define _enter(FMT,...) \
1340 do { \
1341 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KENTER)) \
1342 kenter(FMT,##__VA_ARGS__); \
1343 } while (0)
1344
1345 #define _leave(FMT,...) \
1346 do { \
1347 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KLEAVE)) \
1348 kleave(FMT,##__VA_ARGS__); \
1349 } while (0)
1350
1351 #define _debug(FMT,...) \
1352 do { \
1353 if (unlikely(rxrpc_debug & RXRPC_DEBUG_KDEBUG)) \
1354 kdebug(FMT,##__VA_ARGS__); \
1355 } while (0)
1356
1357 #else
1358 #define _enter(FMT,...) no_printk("==> %s("FMT")",__func__ ,##__VA_ARGS__)
1359 #define _leave(FMT,...) no_printk("<== %s()"FMT"",__func__ ,##__VA_ARGS__)
1360 #define _debug(FMT,...) no_printk(" "FMT ,##__VA_ARGS__)
1361 #endif
1362
1363 /*
1364 * debug assertion checking
1365 */
1366 #if 1 // defined(__KDEBUGALL)
1367
1368 #define ASSERT(X) \
1369 do { \
1370 if (unlikely(!(X))) { \
1371 pr_err("Assertion failed\n"); \
1372 BUG(); \
1373 } \
1374 } while (0)
1375
1376 #define ASSERTCMP(X, OP, Y) \
1377 do { \
1378 __typeof__(X) _x = (X); \
1379 __typeof__(Y) _y = (__typeof__(X))(Y); \
1380 if (unlikely(!(_x OP _y))) { \
1381 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1382 (unsigned long)_x, (unsigned long)_x, #OP, \
1383 (unsigned long)_y, (unsigned long)_y); \
1384 BUG(); \
1385 } \
1386 } while (0)
1387
1388 #define ASSERTIF(C, X) \
1389 do { \
1390 if (unlikely((C) && !(X))) { \
1391 pr_err("Assertion failed\n"); \
1392 BUG(); \
1393 } \
1394 } while (0)
1395
1396 #define ASSERTIFCMP(C, X, OP, Y) \
1397 do { \
1398 __typeof__(X) _x = (X); \
1399 __typeof__(Y) _y = (__typeof__(X))(Y); \
1400 if (unlikely((C) && !(_x OP _y))) { \
1401 pr_err("Assertion failed - %lu(0x%lx) %s %lu(0x%lx) is false\n", \
1402 (unsigned long)_x, (unsigned long)_x, #OP, \
1403 (unsigned long)_y, (unsigned long)_y); \
1404 BUG(); \
1405 } \
1406 } while (0)
1407
1408 #else
1409
1410 #define ASSERT(X) \
1411 do { \
1412 } while (0)
1413
1414 #define ASSERTCMP(X, OP, Y) \
1415 do { \
1416 } while (0)
1417
1418 #define ASSERTIF(C, X) \
1419 do { \
1420 } while (0)
1421
1422 #define ASSERTIFCMP(C, X, OP, Y) \
1423 do { \
1424 } while (0)
1425
1426 #endif /* __KDEBUGALL */
1427