1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* RxRPC individual remote procedure call handling
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/slab.h>
11 #include <linux/module.h>
12 #include <linux/circ_buf.h>
13 #include <linux/spinlock_types.h>
14 #include <net/sock.h>
15 #include <net/af_rxrpc.h>
16 #include "ar-internal.h"
17
18 const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
19 [RXRPC_CALL_UNINITIALISED] = "Uninit ",
20 [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn",
21 [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
22 [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
23 [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
24 [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc",
25 [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
26 [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
27 [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
28 [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
29 [RXRPC_CALL_COMPLETE] = "Complete",
30 };
31
32 const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
33 [RXRPC_CALL_SUCCEEDED] = "Complete",
34 [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
35 [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
36 [RXRPC_CALL_LOCAL_ERROR] = "LocError",
37 [RXRPC_CALL_NETWORK_ERROR] = "NetError",
38 };
39
40 struct kmem_cache *rxrpc_call_jar;
41
42 static DEFINE_SEMAPHORE(rxrpc_call_limiter, 1000);
43 static DEFINE_SEMAPHORE(rxrpc_kernel_call_limiter, 1000);
44
rxrpc_poke_call(struct rxrpc_call * call,enum rxrpc_call_poke_trace what)45 void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what)
46 {
47 struct rxrpc_local *local = call->local;
48 bool busy;
49
50 if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) {
51 spin_lock_irq(&local->lock);
52 busy = !list_empty(&call->attend_link);
53 trace_rxrpc_poke_call(call, busy, what);
54 if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke))
55 busy = true;
56 if (!busy) {
57 list_add_tail(&call->attend_link, &local->call_attend_q);
58 }
59 spin_unlock_irq(&local->lock);
60 if (!busy)
61 rxrpc_wake_up_io_thread(local);
62 }
63 }
64
rxrpc_call_timer_expired(struct timer_list * t)65 static void rxrpc_call_timer_expired(struct timer_list *t)
66 {
67 struct rxrpc_call *call = timer_container_of(call, t, timer);
68
69 _enter("%d", call->debug_id);
70
71 if (!__rxrpc_call_is_complete(call)) {
72 trace_rxrpc_timer_expired(call);
73 rxrpc_poke_call(call, rxrpc_call_poke_timer);
74 }
75 }
76
77 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
78
79 static void rxrpc_destroy_call(struct work_struct *);
80
81 /*
82 * find an extant server call
83 * - called in process context with IRQs enabled
84 */
rxrpc_find_call_by_user_ID(struct rxrpc_sock * rx,unsigned long user_call_ID)85 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
86 unsigned long user_call_ID)
87 {
88 struct rxrpc_call *call;
89 struct rb_node *p;
90
91 _enter("%p,%lx", rx, user_call_ID);
92
93 read_lock(&rx->call_lock);
94
95 p = rx->calls.rb_node;
96 while (p) {
97 call = rb_entry(p, struct rxrpc_call, sock_node);
98
99 if (user_call_ID < call->user_call_ID)
100 p = p->rb_left;
101 else if (user_call_ID > call->user_call_ID)
102 p = p->rb_right;
103 else
104 goto found_extant_call;
105 }
106
107 read_unlock(&rx->call_lock);
108 _leave(" = NULL");
109 return NULL;
110
111 found_extant_call:
112 rxrpc_get_call(call, rxrpc_call_get_sendmsg);
113 read_unlock(&rx->call_lock);
114 _leave(" = %p [%d]", call, refcount_read(&call->ref));
115 return call;
116 }
117
118 /*
119 * allocate a new call
120 */
rxrpc_alloc_call(struct rxrpc_sock * rx,gfp_t gfp,unsigned int debug_id)121 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
122 unsigned int debug_id)
123 {
124 struct rxrpc_call *call;
125 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
126
127 call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
128 if (!call)
129 return NULL;
130
131 mutex_init(&call->user_mutex);
132
133 /* Prevent lockdep reporting a deadlock false positive between the afs
134 * filesystem and sys_sendmsg() via the mmap sem.
135 */
136 if (rx->sk.sk_kern_sock)
137 lockdep_set_class(&call->user_mutex,
138 &rxrpc_call_user_mutex_lock_class_key);
139
140 timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
141 INIT_WORK(&call->destroyer, rxrpc_destroy_call);
142 INIT_LIST_HEAD(&call->link);
143 INIT_LIST_HEAD(&call->wait_link);
144 INIT_LIST_HEAD(&call->accept_link);
145 INIT_LIST_HEAD(&call->recvmsg_link);
146 INIT_LIST_HEAD(&call->sock_link);
147 INIT_LIST_HEAD(&call->attend_link);
148 skb_queue_head_init(&call->recvmsg_queue);
149 skb_queue_head_init(&call->rx_queue);
150 skb_queue_head_init(&call->rx_oos_queue);
151 init_waitqueue_head(&call->waitq);
152 spin_lock_init(&call->notify_lock);
153 refcount_set(&call->ref, 1);
154 call->debug_id = debug_id;
155 call->rx_pkt_offset = USHRT_MAX;
156 call->tx_total_len = -1;
157 call->tx_jumbo_max = 1;
158 call->next_rx_timo = 20 * HZ;
159 call->next_req_timo = 1 * HZ;
160 call->ackr_window = 1;
161 call->ackr_wtop = 1;
162 call->delay_ack_at = KTIME_MAX;
163 call->rack_timo_at = KTIME_MAX;
164 call->ping_at = KTIME_MAX;
165 call->keepalive_at = KTIME_MAX;
166 call->expect_rx_by = KTIME_MAX;
167 call->expect_req_by = KTIME_MAX;
168 call->expect_term_by = KTIME_MAX;
169
170 memset(&call->sock_node, 0xed, sizeof(call->sock_node));
171
172 call->rx_winsize = rxrpc_rx_window_size;
173 call->tx_winsize = 16;
174
175 call->cong_cwnd = RXRPC_MIN_CWND;
176 call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
177
178 rxrpc_call_init_rtt(call);
179
180 call->rxnet = rxnet;
181 call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
182 atomic_inc(&rxnet->nr_calls);
183 return call;
184 }
185
186 /*
187 * Allocate a new client call.
188 */
rxrpc_alloc_client_call(struct rxrpc_sock * rx,struct rxrpc_conn_parameters * cp,struct rxrpc_call_params * p,gfp_t gfp,unsigned int debug_id)189 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
190 struct rxrpc_conn_parameters *cp,
191 struct rxrpc_call_params *p,
192 gfp_t gfp,
193 unsigned int debug_id)
194 {
195 struct rxrpc_call *call;
196 ktime_t now;
197 int ret;
198
199 _enter("");
200
201 call = rxrpc_alloc_call(rx, gfp, debug_id);
202 if (!call)
203 return ERR_PTR(-ENOMEM);
204 now = ktime_get_real();
205 call->acks_latest_ts = now;
206 call->cong_tstamp = now;
207 call->dest_srx = cp->peer->srx;
208 call->dest_srx.srx_service = cp->service_id;
209 call->interruptibility = p->interruptibility;
210 call->tx_total_len = p->tx_total_len;
211 call->key = key_get(cp->key);
212 call->peer = rxrpc_get_peer(cp->peer, rxrpc_peer_get_call);
213 call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call);
214 call->security_level = cp->security_level;
215 if (p->kernel)
216 __set_bit(RXRPC_CALL_KERNEL, &call->flags);
217 if (cp->upgrade)
218 __set_bit(RXRPC_CALL_UPGRADE, &call->flags);
219 if (cp->exclusive)
220 __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
221
222 if (p->timeouts.normal)
223 call->next_rx_timo = umin(p->timeouts.normal, 1);
224 if (p->timeouts.idle)
225 call->next_req_timo = umin(p->timeouts.idle, 1);
226 if (p->timeouts.hard)
227 call->hard_timo = p->timeouts.hard;
228
229 ret = rxrpc_init_client_call_security(call);
230 if (ret < 0) {
231 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret);
232 rxrpc_put_call(call, rxrpc_call_put_discard_error);
233 return ERR_PTR(ret);
234 }
235
236 rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN);
237
238 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
239 p->user_call_ID, rxrpc_call_new_client);
240
241 _leave(" = %p", call);
242 return call;
243 }
244
245 /*
246 * Initiate the call ack/resend/expiry timer.
247 */
rxrpc_start_call_timer(struct rxrpc_call * call)248 void rxrpc_start_call_timer(struct rxrpc_call *call)
249 {
250 if (call->hard_timo) {
251 ktime_t delay = ms_to_ktime(call->hard_timo * 1000);
252
253 call->expect_term_by = ktime_add(ktime_get_real(), delay);
254 trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
255 }
256 call->timer.expires = jiffies;
257 }
258
259 /*
260 * Wait for a call slot to become available.
261 */
rxrpc_get_call_slot(struct rxrpc_call_params * p,gfp_t gfp)262 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
263 {
264 struct semaphore *limiter = &rxrpc_call_limiter;
265
266 if (p->kernel)
267 limiter = &rxrpc_kernel_call_limiter;
268 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
269 down(limiter);
270 return limiter;
271 }
272 return down_interruptible(limiter) < 0 ? NULL : limiter;
273 }
274
275 /*
276 * Release a call slot.
277 */
rxrpc_put_call_slot(struct rxrpc_call * call)278 static void rxrpc_put_call_slot(struct rxrpc_call *call)
279 {
280 struct semaphore *limiter = &rxrpc_call_limiter;
281
282 if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
283 limiter = &rxrpc_kernel_call_limiter;
284 up(limiter);
285 }
286
287 /*
288 * Start the process of connecting a call. We obtain a peer and a connection
289 * bundle, but the actual association of a call with a connection is offloaded
290 * to the I/O thread to simplify locking.
291 */
rxrpc_connect_call(struct rxrpc_call * call,gfp_t gfp)292 static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
293 {
294 struct rxrpc_local *local = call->local;
295 int ret = -ENOMEM;
296
297 _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
298
299 ret = rxrpc_look_up_bundle(call, gfp);
300 if (ret < 0)
301 goto error;
302
303 trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
304 rxrpc_get_call(call, rxrpc_call_get_io_thread);
305 spin_lock_irq(&local->client_call_lock);
306 list_add_tail(&call->wait_link, &local->new_client_calls);
307 spin_unlock_irq(&local->client_call_lock);
308 rxrpc_wake_up_io_thread(local);
309 return 0;
310
311 error:
312 __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
313 return ret;
314 }
315
316 /*
317 * Set up a call for the given parameters.
318 * - Called with the socket lock held, which it must release.
319 * - If it returns a call, the call's lock will need releasing by the caller.
320 */
rxrpc_new_client_call(struct rxrpc_sock * rx,struct rxrpc_conn_parameters * cp,struct rxrpc_call_params * p,gfp_t gfp,unsigned int debug_id)321 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
322 struct rxrpc_conn_parameters *cp,
323 struct rxrpc_call_params *p,
324 gfp_t gfp,
325 unsigned int debug_id)
326 __releases(&rx->sk.sk_lock)
327 __acquires(&call->user_mutex)
328 {
329 struct rxrpc_call *call, *xcall;
330 struct rxrpc_net *rxnet;
331 struct semaphore *limiter;
332 struct rb_node *parent, **pp;
333 int ret;
334
335 _enter("%p,%lx", rx, p->user_call_ID);
336
337 if (WARN_ON_ONCE(!cp->peer)) {
338 release_sock(&rx->sk);
339 return ERR_PTR(-EIO);
340 }
341
342 limiter = rxrpc_get_call_slot(p, gfp);
343 if (!limiter) {
344 release_sock(&rx->sk);
345 return ERR_PTR(-ERESTARTSYS);
346 }
347
348 call = rxrpc_alloc_client_call(rx, cp, p, gfp, debug_id);
349 if (IS_ERR(call)) {
350 release_sock(&rx->sk);
351 up(limiter);
352 _leave(" = %ld", PTR_ERR(call));
353 return call;
354 }
355
356 /* We need to protect a partially set up call against the user as we
357 * will be acting outside the socket lock.
358 */
359 mutex_lock(&call->user_mutex);
360
361 /* Publish the call, even though it is incompletely set up as yet */
362 write_lock(&rx->call_lock);
363
364 pp = &rx->calls.rb_node;
365 parent = NULL;
366 while (*pp) {
367 parent = *pp;
368 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
369
370 if (p->user_call_ID < xcall->user_call_ID)
371 pp = &(*pp)->rb_left;
372 else if (p->user_call_ID > xcall->user_call_ID)
373 pp = &(*pp)->rb_right;
374 else
375 goto error_dup_user_ID;
376 }
377
378 rcu_assign_pointer(call->socket, rx);
379 call->user_call_ID = p->user_call_ID;
380 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
381 rxrpc_get_call(call, rxrpc_call_get_userid);
382 rb_link_node(&call->sock_node, parent, pp);
383 rb_insert_color(&call->sock_node, &rx->calls);
384 list_add(&call->sock_link, &rx->sock_calls);
385
386 write_unlock(&rx->call_lock);
387
388 rxnet = call->rxnet;
389 spin_lock(&rxnet->call_lock);
390 list_add_tail_rcu(&call->link, &rxnet->calls);
391 spin_unlock(&rxnet->call_lock);
392
393 /* From this point on, the call is protected by its own lock. */
394 release_sock(&rx->sk);
395
396 /* Set up or get a connection record and set the protocol parameters,
397 * including channel number and call ID.
398 */
399 ret = rxrpc_connect_call(call, gfp);
400 if (ret < 0)
401 goto error_attached_to_socket;
402
403 _leave(" = %p [new]", call);
404 return call;
405
406 /* We unexpectedly found the user ID in the list after taking
407 * the call_lock. This shouldn't happen unless the user races
408 * with itself and tries to add the same user ID twice at the
409 * same time in different threads.
410 */
411 error_dup_user_ID:
412 write_unlock(&rx->call_lock);
413 release_sock(&rx->sk);
414 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST);
415 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0,
416 rxrpc_call_see_userid_exists);
417 mutex_unlock(&call->user_mutex);
418 rxrpc_put_call(call, rxrpc_call_put_userid_exists);
419 _leave(" = -EEXIST");
420 return ERR_PTR(-EEXIST);
421
422 /* We got an error, but the call is attached to the socket and is in
423 * need of release. However, we might now race with recvmsg() when it
424 * completion notifies the socket. Return 0 from sys_sendmsg() and
425 * leave the error to recvmsg() to deal with.
426 */
427 error_attached_to_socket:
428 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret,
429 rxrpc_call_see_connect_failed);
430 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
431 _leave(" = c=%08x [err]", call->debug_id);
432 return call;
433 }
434
435 /*
436 * Set up an incoming call. call->conn points to the connection.
437 * This is called with interrupts disabled and isn't allowed to fail.
438 */
rxrpc_incoming_call(struct rxrpc_sock * rx,struct rxrpc_call * call,struct sk_buff * skb)439 void rxrpc_incoming_call(struct rxrpc_sock *rx,
440 struct rxrpc_call *call,
441 struct sk_buff *skb)
442 {
443 struct rxrpc_connection *conn = call->conn;
444 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
445 u32 chan;
446
447 _enter(",%d", call->conn->debug_id);
448
449 rcu_assign_pointer(call->socket, rx);
450 call->call_id = sp->hdr.callNumber;
451 call->dest_srx.srx_service = sp->hdr.serviceId;
452 call->cid = sp->hdr.cid;
453 call->cong_tstamp = skb->tstamp;
454
455 __set_bit(RXRPC_CALL_EXPOSED, &call->flags);
456 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
457
458 spin_lock(&conn->state_lock);
459
460 switch (conn->state) {
461 case RXRPC_CONN_SERVICE_UNSECURED:
462 case RXRPC_CONN_SERVICE_CHALLENGING:
463 __set_bit(RXRPC_CALL_CONN_CHALLENGING, &call->flags);
464 break;
465 case RXRPC_CONN_SERVICE:
466 break;
467
468 case RXRPC_CONN_ABORTED:
469 rxrpc_set_call_completion(call, conn->completion,
470 conn->abort_code, conn->error);
471 break;
472 default:
473 BUG();
474 }
475
476 rxrpc_get_call(call, rxrpc_call_get_io_thread);
477
478 /* Set the channel for this call. We don't get channel_lock as we're
479 * only defending against the data_ready handler (which we're called
480 * from) and the RESPONSE packet parser (which is only really
481 * interested in call_counter and can cope with a disagreement with the
482 * call pointer).
483 */
484 chan = sp->hdr.cid & RXRPC_CHANNELMASK;
485 conn->channels[chan].call_counter = call->call_id;
486 conn->channels[chan].call_id = call->call_id;
487 conn->channels[chan].call = call;
488 spin_unlock(&conn->state_lock);
489
490 spin_lock(&conn->peer->lock);
491 hlist_add_head(&call->error_link, &conn->peer->error_targets);
492 spin_unlock(&conn->peer->lock);
493
494 rxrpc_start_call_timer(call);
495 _leave("");
496 }
497
498 /*
499 * Note the re-emergence of a call.
500 */
rxrpc_see_call(struct rxrpc_call * call,enum rxrpc_call_trace why)501 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
502 {
503 if (call) {
504 int r = refcount_read(&call->ref);
505
506 trace_rxrpc_call(call->debug_id, r, 0, why);
507 }
508 }
509
rxrpc_try_get_call(struct rxrpc_call * call,enum rxrpc_call_trace why)510 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
511 enum rxrpc_call_trace why)
512 {
513 int r;
514
515 if (!call || !__refcount_inc_not_zero(&call->ref, &r))
516 return NULL;
517 trace_rxrpc_call(call->debug_id, r + 1, 0, why);
518 return call;
519 }
520
521 /*
522 * Note the addition of a ref on a call.
523 */
rxrpc_get_call(struct rxrpc_call * call,enum rxrpc_call_trace why)524 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
525 {
526 int r;
527
528 __refcount_inc(&call->ref, &r);
529 trace_rxrpc_call(call->debug_id, r + 1, 0, why);
530 }
531
532 /*
533 * Clean up the transmission buffers.
534 */
rxrpc_cleanup_tx_buffers(struct rxrpc_call * call)535 static void rxrpc_cleanup_tx_buffers(struct rxrpc_call *call)
536 {
537 struct rxrpc_txqueue *tq, *next;
538
539 for (tq = call->tx_queue; tq; tq = next) {
540 next = tq->next;
541 for (int i = 0; i < RXRPC_NR_TXQUEUE; i++)
542 if (tq->bufs[i])
543 rxrpc_put_txbuf(tq->bufs[i], rxrpc_txbuf_put_cleaned);
544 trace_rxrpc_tq(call, tq, 0, rxrpc_tq_cleaned);
545 kfree(tq);
546 }
547 }
548
549 /*
550 * Clean up the receive buffers.
551 */
rxrpc_cleanup_rx_buffers(struct rxrpc_call * call)552 static void rxrpc_cleanup_rx_buffers(struct rxrpc_call *call)
553 {
554 rxrpc_purge_queue(&call->recvmsg_queue);
555 rxrpc_purge_queue(&call->rx_queue);
556 rxrpc_purge_queue(&call->rx_oos_queue);
557 kfree(call->rx_dec_buffer);
558 }
559
560 /*
561 * Detach a call from its owning socket.
562 */
rxrpc_release_call(struct rxrpc_sock * rx,struct rxrpc_call * call)563 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
564 {
565 struct rxrpc_connection *conn = call->conn;
566 bool putu = false;
567
568 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
569
570 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
571 call->flags, rxrpc_call_see_release);
572
573 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
574 BUG();
575
576 rxrpc_put_call_slot(call);
577
578 /* Note that at this point, the call may still be on or may have been
579 * added back on to the socket receive queue. recvmsg() must discard
580 * released calls. The CALL_RELEASED flag should prevent further
581 * notifications.
582 */
583 spin_lock_irq(&rx->recvmsg_lock);
584 spin_unlock_irq(&rx->recvmsg_lock);
585
586 write_lock(&rx->call_lock);
587
588 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
589 rb_erase(&call->sock_node, &rx->calls);
590 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
591 putu = true;
592 }
593
594 list_del(&call->sock_link);
595 write_unlock(&rx->call_lock);
596
597 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
598
599 if (putu)
600 rxrpc_put_call(call, rxrpc_call_put_userid);
601
602 _leave("");
603 }
604
605 /*
606 * release all the calls associated with a socket
607 */
rxrpc_release_calls_on_socket(struct rxrpc_sock * rx)608 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
609 {
610 struct rxrpc_call *call;
611
612 _enter("%p", rx);
613
614 while (!list_empty(&rx->to_be_accepted)) {
615 call = list_entry(rx->to_be_accepted.next,
616 struct rxrpc_call, accept_link);
617 list_del(&call->accept_link);
618 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
619 rxrpc_abort_call_sock_release_tba);
620 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
621 }
622
623 while (!list_empty(&rx->sock_calls)) {
624 call = list_entry(rx->sock_calls.next,
625 struct rxrpc_call, sock_link);
626 rxrpc_get_call(call, rxrpc_call_get_release_sock);
627 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
628 rxrpc_abort_call_sock_release);
629 rxrpc_release_call(rx, call);
630 rxrpc_put_call(call, rxrpc_call_put_release_sock);
631 }
632
633 while ((call = list_first_entry_or_null(&rx->recvmsg_q,
634 struct rxrpc_call, recvmsg_link))) {
635 list_del_init(&call->recvmsg_link);
636 rxrpc_put_call(call, rxrpc_call_put_release_recvmsg_q);
637 }
638
639 _leave("");
640 }
641
642 /*
643 * release a call
644 */
rxrpc_put_call(struct rxrpc_call * call,enum rxrpc_call_trace why)645 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
646 {
647 struct rxrpc_net *rxnet = call->rxnet;
648 unsigned int debug_id = call->debug_id;
649 bool dead;
650 int r;
651
652 ASSERT(call != NULL);
653
654 dead = __refcount_dec_and_test(&call->ref, &r);
655 trace_rxrpc_call(debug_id, r - 1, 0, why);
656 if (dead) {
657 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
658
659 spin_lock(&rxnet->call_lock);
660 list_del_rcu(&call->link);
661 spin_unlock(&rxnet->call_lock);
662
663 rxrpc_cleanup_call(call);
664 }
665 }
666
667 /*
668 * Free up the call under RCU.
669 */
rxrpc_rcu_free_call(struct rcu_head * rcu)670 static void rxrpc_rcu_free_call(struct rcu_head *rcu)
671 {
672 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
673 struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
674
675 kmem_cache_free(rxrpc_call_jar, call);
676 if (atomic_dec_and_test(&rxnet->nr_calls))
677 wake_up_var(&rxnet->nr_calls);
678 }
679
680 /*
681 * Final call destruction - but must be done in process context.
682 */
rxrpc_destroy_call(struct work_struct * work)683 static void rxrpc_destroy_call(struct work_struct *work)
684 {
685 struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
686
687 timer_delete_sync(&call->timer);
688
689 rxrpc_cleanup_tx_buffers(call);
690 rxrpc_cleanup_rx_buffers(call);
691 rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
692 rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
693 rxrpc_deactivate_bundle(call->bundle);
694 rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
695 rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
696 rxrpc_put_local(call->local, rxrpc_local_put_call);
697 key_put(call->key);
698 call_rcu(&call->rcu, rxrpc_rcu_free_call);
699 }
700
701 /*
702 * clean up a call
703 */
rxrpc_cleanup_call(struct rxrpc_call * call)704 void rxrpc_cleanup_call(struct rxrpc_call *call)
705 {
706 memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
707
708 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
709 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
710
711 timer_delete(&call->timer);
712
713 if (rcu_read_lock_held())
714 /* Can't use the rxrpc workqueue as we need to cancel/flush
715 * something that may be running/waiting there.
716 */
717 schedule_work(&call->destroyer);
718 else
719 rxrpc_destroy_call(&call->destroyer);
720 }
721
722 /*
723 * Make sure that all calls are gone from a network namespace. To reach this
724 * point, any open UDP sockets in that namespace must have been closed, so any
725 * outstanding calls cannot be doing I/O.
726 */
rxrpc_destroy_all_calls(struct rxrpc_net * rxnet)727 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
728 {
729 struct rxrpc_call *call;
730
731 _enter("");
732
733 if (!list_empty(&rxnet->calls)) {
734 int shown = 0;
735
736 spin_lock(&rxnet->call_lock);
737
738 list_for_each_entry(call, &rxnet->calls, link) {
739 rxrpc_see_call(call, rxrpc_call_see_still_live);
740
741 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
742 call, refcount_read(&call->ref),
743 rxrpc_call_states[__rxrpc_call_state(call)],
744 call->flags, call->events);
745
746 if (++shown >= 10)
747 break;
748 }
749
750 spin_unlock(&rxnet->call_lock);
751 }
752
753 atomic_dec(&rxnet->nr_calls);
754 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
755 }
756
757 /**
758 * rxrpc_kernel_query_call_security - Query call's security parameters
759 * @call: The call to query
760 * @_service_id: Where to return the service ID
761 * @_enctype: Where to return the "encoding type"
762 *
763 * This queries the security parameters of a call, setting *@_service_id and
764 * *@_enctype and returning the security class.
765 *
766 * Return: The security class protocol number.
767 */
rxrpc_kernel_query_call_security(struct rxrpc_call * call,u16 * _service_id,u32 * _enctype)768 u8 rxrpc_kernel_query_call_security(struct rxrpc_call *call,
769 u16 *_service_id, u32 *_enctype)
770 {
771 *_service_id = call->dest_srx.srx_service;
772 *_enctype = call->security_enctype;
773 return call->security_ix;
774 }
775 EXPORT_SYMBOL(rxrpc_kernel_query_call_security);
776