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 = from_timer(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->rx_queue);
149 skb_queue_head_init(&call->recvmsg_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->tx_total_len = -1;
156 call->tx_jumbo_max = 1;
157 call->next_rx_timo = 20 * HZ;
158 call->next_req_timo = 1 * HZ;
159 call->ackr_window = 1;
160 call->ackr_wtop = 1;
161 call->delay_ack_at = KTIME_MAX;
162 call->rack_timo_at = KTIME_MAX;
163 call->ping_at = KTIME_MAX;
164 call->keepalive_at = KTIME_MAX;
165 call->expect_rx_by = KTIME_MAX;
166 call->expect_req_by = KTIME_MAX;
167 call->expect_term_by = KTIME_MAX;
168
169 memset(&call->sock_node, 0xed, sizeof(call->sock_node));
170
171 call->rx_winsize = rxrpc_rx_window_size;
172 call->tx_winsize = 16;
173
174 call->cong_cwnd = RXRPC_MIN_CWND;
175 call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
176
177 rxrpc_call_init_rtt(call);
178
179 call->rxnet = rxnet;
180 call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
181 atomic_inc(&rxnet->nr_calls);
182 return call;
183 }
184
185 /*
186 * Allocate a new client call.
187 */
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)188 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
189 struct rxrpc_conn_parameters *cp,
190 struct rxrpc_call_params *p,
191 gfp_t gfp,
192 unsigned int debug_id)
193 {
194 struct rxrpc_call *call;
195 ktime_t now;
196 int ret;
197
198 _enter("");
199
200 call = rxrpc_alloc_call(rx, gfp, debug_id);
201 if (!call)
202 return ERR_PTR(-ENOMEM);
203 now = ktime_get_real();
204 call->acks_latest_ts = now;
205 call->cong_tstamp = now;
206 call->dest_srx = cp->peer->srx;
207 call->dest_srx.srx_service = cp->service_id;
208 call->interruptibility = p->interruptibility;
209 call->tx_total_len = p->tx_total_len;
210 call->key = key_get(cp->key);
211 call->peer = rxrpc_get_peer(cp->peer, rxrpc_peer_get_call);
212 call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call);
213 call->security_level = cp->security_level;
214 if (p->kernel)
215 __set_bit(RXRPC_CALL_KERNEL, &call->flags);
216 if (cp->upgrade)
217 __set_bit(RXRPC_CALL_UPGRADE, &call->flags);
218 if (cp->exclusive)
219 __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
220
221 if (p->timeouts.normal)
222 call->next_rx_timo = umin(p->timeouts.normal, 1);
223 if (p->timeouts.idle)
224 call->next_req_timo = umin(p->timeouts.idle, 1);
225 if (p->timeouts.hard)
226 call->hard_timo = p->timeouts.hard;
227
228 ret = rxrpc_init_client_call_security(call);
229 if (ret < 0) {
230 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret);
231 rxrpc_put_call(call, rxrpc_call_put_discard_error);
232 return ERR_PTR(ret);
233 }
234
235 rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN);
236
237 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
238 p->user_call_ID, rxrpc_call_new_client);
239
240 _leave(" = %p", call);
241 return call;
242 }
243
244 /*
245 * Initiate the call ack/resend/expiry timer.
246 */
rxrpc_start_call_timer(struct rxrpc_call * call)247 void rxrpc_start_call_timer(struct rxrpc_call *call)
248 {
249 if (call->hard_timo) {
250 ktime_t delay = ms_to_ktime(call->hard_timo * 1000);
251
252 call->expect_term_by = ktime_add(ktime_get_real(), delay);
253 trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
254 }
255 call->timer.expires = jiffies;
256 }
257
258 /*
259 * Wait for a call slot to become available.
260 */
rxrpc_get_call_slot(struct rxrpc_call_params * p,gfp_t gfp)261 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
262 {
263 struct semaphore *limiter = &rxrpc_call_limiter;
264
265 if (p->kernel)
266 limiter = &rxrpc_kernel_call_limiter;
267 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
268 down(limiter);
269 return limiter;
270 }
271 return down_interruptible(limiter) < 0 ? NULL : limiter;
272 }
273
274 /*
275 * Release a call slot.
276 */
rxrpc_put_call_slot(struct rxrpc_call * call)277 static void rxrpc_put_call_slot(struct rxrpc_call *call)
278 {
279 struct semaphore *limiter = &rxrpc_call_limiter;
280
281 if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
282 limiter = &rxrpc_kernel_call_limiter;
283 up(limiter);
284 }
285
286 /*
287 * Start the process of connecting a call. We obtain a peer and a connection
288 * bundle, but the actual association of a call with a connection is offloaded
289 * to the I/O thread to simplify locking.
290 */
rxrpc_connect_call(struct rxrpc_call * call,gfp_t gfp)291 static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
292 {
293 struct rxrpc_local *local = call->local;
294 int ret = -ENOMEM;
295
296 _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
297
298 ret = rxrpc_look_up_bundle(call, gfp);
299 if (ret < 0)
300 goto error;
301
302 trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
303 rxrpc_get_call(call, rxrpc_call_get_io_thread);
304 spin_lock_irq(&local->client_call_lock);
305 list_add_tail(&call->wait_link, &local->new_client_calls);
306 spin_unlock_irq(&local->client_call_lock);
307 rxrpc_wake_up_io_thread(local);
308 return 0;
309
310 error:
311 __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
312 return ret;
313 }
314
315 /*
316 * Set up a call for the given parameters.
317 * - Called with the socket lock held, which it must release.
318 * - If it returns a call, the call's lock will need releasing by the caller.
319 */
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)320 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
321 struct rxrpc_conn_parameters *cp,
322 struct rxrpc_call_params *p,
323 gfp_t gfp,
324 unsigned int debug_id)
325 __releases(&rx->sk.sk_lock.slock)
326 __acquires(&call->user_mutex)
327 {
328 struct rxrpc_call *call, *xcall;
329 struct rxrpc_net *rxnet;
330 struct semaphore *limiter;
331 struct rb_node *parent, **pp;
332 int ret;
333
334 _enter("%p,%lx", rx, p->user_call_ID);
335
336 if (WARN_ON_ONCE(!cp->peer)) {
337 release_sock(&rx->sk);
338 return ERR_PTR(-EIO);
339 }
340
341 limiter = rxrpc_get_call_slot(p, gfp);
342 if (!limiter) {
343 release_sock(&rx->sk);
344 return ERR_PTR(-ERESTARTSYS);
345 }
346
347 call = rxrpc_alloc_client_call(rx, cp, p, gfp, debug_id);
348 if (IS_ERR(call)) {
349 release_sock(&rx->sk);
350 up(limiter);
351 _leave(" = %ld", PTR_ERR(call));
352 return call;
353 }
354
355 /* We need to protect a partially set up call against the user as we
356 * will be acting outside the socket lock.
357 */
358 mutex_lock(&call->user_mutex);
359
360 /* Publish the call, even though it is incompletely set up as yet */
361 write_lock(&rx->call_lock);
362
363 pp = &rx->calls.rb_node;
364 parent = NULL;
365 while (*pp) {
366 parent = *pp;
367 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
368
369 if (p->user_call_ID < xcall->user_call_ID)
370 pp = &(*pp)->rb_left;
371 else if (p->user_call_ID > xcall->user_call_ID)
372 pp = &(*pp)->rb_right;
373 else
374 goto error_dup_user_ID;
375 }
376
377 rcu_assign_pointer(call->socket, rx);
378 call->user_call_ID = p->user_call_ID;
379 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
380 rxrpc_get_call(call, rxrpc_call_get_userid);
381 rb_link_node(&call->sock_node, parent, pp);
382 rb_insert_color(&call->sock_node, &rx->calls);
383 list_add(&call->sock_link, &rx->sock_calls);
384
385 write_unlock(&rx->call_lock);
386
387 rxnet = call->rxnet;
388 spin_lock(&rxnet->call_lock);
389 list_add_tail_rcu(&call->link, &rxnet->calls);
390 spin_unlock(&rxnet->call_lock);
391
392 /* From this point on, the call is protected by its own lock. */
393 release_sock(&rx->sk);
394
395 /* Set up or get a connection record and set the protocol parameters,
396 * including channel number and call ID.
397 */
398 ret = rxrpc_connect_call(call, gfp);
399 if (ret < 0)
400 goto error_attached_to_socket;
401
402 _leave(" = %p [new]", call);
403 return call;
404
405 /* We unexpectedly found the user ID in the list after taking
406 * the call_lock. This shouldn't happen unless the user races
407 * with itself and tries to add the same user ID twice at the
408 * same time in different threads.
409 */
410 error_dup_user_ID:
411 write_unlock(&rx->call_lock);
412 release_sock(&rx->sk);
413 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST);
414 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0,
415 rxrpc_call_see_userid_exists);
416 mutex_unlock(&call->user_mutex);
417 rxrpc_put_call(call, rxrpc_call_put_userid_exists);
418 _leave(" = -EEXIST");
419 return ERR_PTR(-EEXIST);
420
421 /* We got an error, but the call is attached to the socket and is in
422 * need of release. However, we might now race with recvmsg() when it
423 * completion notifies the socket. Return 0 from sys_sendmsg() and
424 * leave the error to recvmsg() to deal with.
425 */
426 error_attached_to_socket:
427 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret,
428 rxrpc_call_see_connect_failed);
429 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
430 _leave(" = c=%08x [err]", call->debug_id);
431 return call;
432 }
433
434 /*
435 * Set up an incoming call. call->conn points to the connection.
436 * This is called with interrupts disabled and isn't allowed to fail.
437 */
rxrpc_incoming_call(struct rxrpc_sock * rx,struct rxrpc_call * call,struct sk_buff * skb)438 void rxrpc_incoming_call(struct rxrpc_sock *rx,
439 struct rxrpc_call *call,
440 struct sk_buff *skb)
441 {
442 struct rxrpc_connection *conn = call->conn;
443 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
444 u32 chan;
445
446 _enter(",%d", call->conn->debug_id);
447
448 rcu_assign_pointer(call->socket, rx);
449 call->call_id = sp->hdr.callNumber;
450 call->dest_srx.srx_service = sp->hdr.serviceId;
451 call->cid = sp->hdr.cid;
452 call->cong_tstamp = skb->tstamp;
453
454 __set_bit(RXRPC_CALL_EXPOSED, &call->flags);
455 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
456
457 spin_lock(&conn->state_lock);
458
459 switch (conn->state) {
460 case RXRPC_CONN_SERVICE_UNSECURED:
461 case RXRPC_CONN_SERVICE_CHALLENGING:
462 __set_bit(RXRPC_CALL_CONN_CHALLENGING, &call->flags);
463 break;
464 case RXRPC_CONN_SERVICE:
465 break;
466
467 case RXRPC_CONN_ABORTED:
468 rxrpc_set_call_completion(call, conn->completion,
469 conn->abort_code, conn->error);
470 break;
471 default:
472 BUG();
473 }
474
475 rxrpc_get_call(call, rxrpc_call_get_io_thread);
476
477 /* Set the channel for this call. We don't get channel_lock as we're
478 * only defending against the data_ready handler (which we're called
479 * from) and the RESPONSE packet parser (which is only really
480 * interested in call_counter and can cope with a disagreement with the
481 * call pointer).
482 */
483 chan = sp->hdr.cid & RXRPC_CHANNELMASK;
484 conn->channels[chan].call_counter = call->call_id;
485 conn->channels[chan].call_id = call->call_id;
486 conn->channels[chan].call = call;
487 spin_unlock(&conn->state_lock);
488
489 spin_lock(&conn->peer->lock);
490 hlist_add_head(&call->error_link, &conn->peer->error_targets);
491 spin_unlock(&conn->peer->lock);
492
493 rxrpc_start_call_timer(call);
494 _leave("");
495 }
496
497 /*
498 * Note the re-emergence of a call.
499 */
rxrpc_see_call(struct rxrpc_call * call,enum rxrpc_call_trace why)500 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
501 {
502 if (call) {
503 int r = refcount_read(&call->ref);
504
505 trace_rxrpc_call(call->debug_id, r, 0, why);
506 }
507 }
508
rxrpc_try_get_call(struct rxrpc_call * call,enum rxrpc_call_trace why)509 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
510 enum rxrpc_call_trace why)
511 {
512 int r;
513
514 if (!call || !__refcount_inc_not_zero(&call->ref, &r))
515 return NULL;
516 trace_rxrpc_call(call->debug_id, r + 1, 0, why);
517 return call;
518 }
519
520 /*
521 * Note the addition of a ref on a call.
522 */
rxrpc_get_call(struct rxrpc_call * call,enum rxrpc_call_trace why)523 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
524 {
525 int r;
526
527 __refcount_inc(&call->ref, &r);
528 trace_rxrpc_call(call->debug_id, r + 1, 0, why);
529 }
530
531 /*
532 * Clean up the transmission buffers.
533 */
rxrpc_cleanup_tx_buffers(struct rxrpc_call * call)534 static void rxrpc_cleanup_tx_buffers(struct rxrpc_call *call)
535 {
536 struct rxrpc_txqueue *tq, *next;
537
538 for (tq = call->tx_queue; tq; tq = next) {
539 next = tq->next;
540 for (int i = 0; i < RXRPC_NR_TXQUEUE; i++)
541 if (tq->bufs[i])
542 rxrpc_put_txbuf(tq->bufs[i], rxrpc_txbuf_put_cleaned);
543 trace_rxrpc_tq(call, tq, 0, rxrpc_tq_cleaned);
544 kfree(tq);
545 }
546 }
547
548 /*
549 * Clean up the receive buffers.
550 */
rxrpc_cleanup_rx_buffers(struct rxrpc_call * call)551 static void rxrpc_cleanup_rx_buffers(struct rxrpc_call *call)
552 {
553 rxrpc_purge_queue(&call->recvmsg_queue);
554 rxrpc_purge_queue(&call->rx_queue);
555 rxrpc_purge_queue(&call->rx_oos_queue);
556 }
557
558 /*
559 * Detach a call from its owning socket.
560 */
rxrpc_release_call(struct rxrpc_sock * rx,struct rxrpc_call * call)561 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
562 {
563 struct rxrpc_connection *conn = call->conn;
564 bool put = false, putu = false;
565
566 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
567
568 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
569 call->flags, rxrpc_call_see_release);
570
571 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
572 BUG();
573
574 rxrpc_put_call_slot(call);
575
576 /* Make sure we don't get any more notifications */
577 spin_lock_irq(&rx->recvmsg_lock);
578
579 if (!list_empty(&call->recvmsg_link)) {
580 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
581 call, call->events, call->flags);
582 list_del(&call->recvmsg_link);
583 put = true;
584 }
585
586 /* list_empty() must return false in rxrpc_notify_socket() */
587 call->recvmsg_link.next = NULL;
588 call->recvmsg_link.prev = NULL;
589
590 spin_unlock_irq(&rx->recvmsg_lock);
591 if (put)
592 rxrpc_put_call(call, rxrpc_call_put_unnotify);
593
594 write_lock(&rx->call_lock);
595
596 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
597 rb_erase(&call->sock_node, &rx->calls);
598 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
599 putu = true;
600 }
601
602 list_del(&call->sock_link);
603 write_unlock(&rx->call_lock);
604
605 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
606
607 if (putu)
608 rxrpc_put_call(call, rxrpc_call_put_userid);
609
610 _leave("");
611 }
612
613 /*
614 * release all the calls associated with a socket
615 */
rxrpc_release_calls_on_socket(struct rxrpc_sock * rx)616 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
617 {
618 struct rxrpc_call *call;
619
620 _enter("%p", rx);
621
622 while (!list_empty(&rx->to_be_accepted)) {
623 call = list_entry(rx->to_be_accepted.next,
624 struct rxrpc_call, accept_link);
625 list_del(&call->accept_link);
626 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
627 rxrpc_abort_call_sock_release_tba);
628 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
629 }
630
631 while (!list_empty(&rx->sock_calls)) {
632 call = list_entry(rx->sock_calls.next,
633 struct rxrpc_call, sock_link);
634 rxrpc_get_call(call, rxrpc_call_get_release_sock);
635 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
636 rxrpc_abort_call_sock_release);
637 rxrpc_release_call(rx, call);
638 rxrpc_put_call(call, rxrpc_call_put_release_sock);
639 }
640
641 _leave("");
642 }
643
644 /*
645 * release a call
646 */
rxrpc_put_call(struct rxrpc_call * call,enum rxrpc_call_trace why)647 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
648 {
649 struct rxrpc_net *rxnet = call->rxnet;
650 unsigned int debug_id = call->debug_id;
651 bool dead;
652 int r;
653
654 ASSERT(call != NULL);
655
656 dead = __refcount_dec_and_test(&call->ref, &r);
657 trace_rxrpc_call(debug_id, r - 1, 0, why);
658 if (dead) {
659 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
660
661 if (!list_empty(&call->link)) {
662 spin_lock(&rxnet->call_lock);
663 list_del_init(&call->link);
664 spin_unlock(&rxnet->call_lock);
665 }
666
667 rxrpc_cleanup_call(call);
668 }
669 }
670
671 /*
672 * Free up the call under RCU.
673 */
rxrpc_rcu_free_call(struct rcu_head * rcu)674 static void rxrpc_rcu_free_call(struct rcu_head *rcu)
675 {
676 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
677 struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
678
679 kmem_cache_free(rxrpc_call_jar, call);
680 if (atomic_dec_and_test(&rxnet->nr_calls))
681 wake_up_var(&rxnet->nr_calls);
682 }
683
684 /*
685 * Final call destruction - but must be done in process context.
686 */
rxrpc_destroy_call(struct work_struct * work)687 static void rxrpc_destroy_call(struct work_struct *work)
688 {
689 struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
690
691 del_timer_sync(&call->timer);
692
693 rxrpc_cleanup_tx_buffers(call);
694 rxrpc_cleanup_rx_buffers(call);
695 rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
696 rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
697 rxrpc_deactivate_bundle(call->bundle);
698 rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
699 rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
700 rxrpc_put_local(call->local, rxrpc_local_put_call);
701 call_rcu(&call->rcu, rxrpc_rcu_free_call);
702 }
703
704 /*
705 * clean up a call
706 */
rxrpc_cleanup_call(struct rxrpc_call * call)707 void rxrpc_cleanup_call(struct rxrpc_call *call)
708 {
709 memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
710
711 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
712 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
713
714 del_timer(&call->timer);
715
716 if (rcu_read_lock_held())
717 /* Can't use the rxrpc workqueue as we need to cancel/flush
718 * something that may be running/waiting there.
719 */
720 schedule_work(&call->destroyer);
721 else
722 rxrpc_destroy_call(&call->destroyer);
723 }
724
725 /*
726 * Make sure that all calls are gone from a network namespace. To reach this
727 * point, any open UDP sockets in that namespace must have been closed, so any
728 * outstanding calls cannot be doing I/O.
729 */
rxrpc_destroy_all_calls(struct rxrpc_net * rxnet)730 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
731 {
732 struct rxrpc_call *call;
733
734 _enter("");
735
736 if (!list_empty(&rxnet->calls)) {
737 spin_lock(&rxnet->call_lock);
738
739 while (!list_empty(&rxnet->calls)) {
740 call = list_entry(rxnet->calls.next,
741 struct rxrpc_call, link);
742 _debug("Zapping call %p", call);
743
744 rxrpc_see_call(call, rxrpc_call_see_zap);
745 list_del_init(&call->link);
746
747 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
748 call, refcount_read(&call->ref),
749 rxrpc_call_states[__rxrpc_call_state(call)],
750 call->flags, call->events);
751
752 spin_unlock(&rxnet->call_lock);
753 cond_resched();
754 spin_lock(&rxnet->call_lock);
755 }
756
757 spin_unlock(&rxnet->call_lock);
758 }
759
760 atomic_dec(&rxnet->nr_calls);
761 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
762 }
763