projects/linux·blob master · refs

777 lines · 20.7 KiB

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 ([email protected])
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
18const 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_PRE_SEND] = "ClPreSnd",
22 [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
23 [RXRPC_CALL_CLIENT_AWAIT_ACK] = "ClAwtAck",
24 [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
25 [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
26 [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc",
27 [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
28 [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
29 [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
30 [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
31 [RXRPC_CALL_COMPLETE] = "Complete",
32};
33
34const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
35 [RXRPC_CALL_SUCCEEDED] = "Complete",
36 [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
37 [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
38 [RXRPC_CALL_LOCAL_ERROR] = "LocError",
39 [RXRPC_CALL_NETWORK_ERROR] = "NetError",
40};
41
42struct kmem_cache *rxrpc_call_jar;
43
44static DEFINE_SEMAPHORE(rxrpc_call_limiter, 1000);
45static DEFINE_SEMAPHORE(rxrpc_kernel_call_limiter, 1000);
46
47void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what)
48{
49 struct rxrpc_local *local = call->local;
50 bool busy;
51
52 if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) {
53 spin_lock_irq(&local->lock);
54 busy = !list_empty(&call->attend_link);
55 trace_rxrpc_poke_call(call, busy, what);
56 if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke))
57 busy = true;
58 if (!busy) {
59 list_add_tail(&call->attend_link, &local->call_attend_q);
60 }
61 spin_unlock_irq(&local->lock);
62 if (!busy)
63 rxrpc_wake_up_io_thread(local);
64 }
65}
66
67static void rxrpc_call_timer_expired(struct timer_list *t)
68{
69 struct rxrpc_call *call = timer_container_of(call, t, timer);
70
71 _enter("%d", call->debug_id);
72
73 if (!__rxrpc_call_is_complete(call)) {
74 trace_rxrpc_timer_expired(call);
75 rxrpc_poke_call(call, rxrpc_call_poke_timer);
76 }
77}
78
79static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
80
81static void rxrpc_destroy_call(struct work_struct *);
82
83/*
84 * find an extant server call
85 * - called in process context with IRQs enabled
86 */
87struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
88 unsigned long user_call_ID)
89{
90 struct rxrpc_call *call;
91 struct rb_node *p;
92
93 _enter("%p,%lx", rx, user_call_ID);
94
95 read_lock(&rx->call_lock);
96
97 p = rx->calls.rb_node;
98 while (p) {
99 call = rb_entry(p, struct rxrpc_call, sock_node);
100
101 if (user_call_ID < call->user_call_ID)
102 p = p->rb_left;
103 else if (user_call_ID > call->user_call_ID)
104 p = p->rb_right;
105 else
106 goto found_extant_call;
107 }
108
109 read_unlock(&rx->call_lock);
110 _leave(" = NULL");
111 return NULL;
112
113found_extant_call:
114 rxrpc_get_call(call, rxrpc_call_get_sendmsg);
115 read_unlock(&rx->call_lock);
116 _leave(" = %p [%d]", call, refcount_read(&call->ref));
117 return call;
118}
119
120/*
121 * allocate a new call
122 */
123struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
124 unsigned int debug_id)
125{
126 struct rxrpc_call *call;
127 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
128
129 call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
130 if (!call)
131 return NULL;
132
133 mutex_init(&call->user_mutex);
134
135 /* Prevent lockdep reporting a deadlock false positive between the afs
136 * filesystem and sys_sendmsg() via the mmap sem.
137 */
138 if (rx->sk.sk_kern_sock)
139 lockdep_set_class(&call->user_mutex,
140 &rxrpc_call_user_mutex_lock_class_key);
141
142 timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
143 INIT_WORK(&call->destroyer, rxrpc_destroy_call);
144 INIT_LIST_HEAD(&call->link);
145 INIT_LIST_HEAD(&call->wait_link);
146 INIT_LIST_HEAD(&call->accept_link);
147 INIT_LIST_HEAD(&call->recvmsg_link);
148 INIT_LIST_HEAD(&call->sock_link);
149 INIT_LIST_HEAD(&call->attend_link);
150 skb_queue_head_init(&call->recvmsg_queue);
151 skb_queue_head_init(&call->rx_queue);
152 skb_queue_head_init(&call->rx_oos_queue);
153 init_waitqueue_head(&call->waitq);
154 spin_lock_init(&call->notify_lock);
155 refcount_set(&call->ref, 1);
156 call->debug_id = debug_id;
157 call->rx_pkt_offset = USHRT_MAX;
158 call->tx_total_len = -1;
159 call->tx_jumbo_max = 1;
160 call->next_rx_timo = 20 * HZ;
161 call->next_req_timo = 1 * HZ;
162 call->ackr_window = 1;
163 call->ackr_wtop = 1;
164 call->delay_ack_at = KTIME_MAX;
165 call->rack_timo_at = KTIME_MAX;
166 call->ping_at = KTIME_MAX;
167 call->keepalive_at = KTIME_MAX;
168 call->expect_rx_by = KTIME_MAX;
169 call->expect_req_by = KTIME_MAX;
170 call->expect_term_by = KTIME_MAX;
171
172 memset(&call->sock_node, 0xed, sizeof(call->sock_node));
173
174 call->rx_winsize = rxrpc_rx_window_size;
175 call->tx_winsize = 16;
176
177 call->cong_cwnd = RXRPC_MIN_CWND;
178 call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
179
180 rxrpc_call_init_rtt(call);
181
182 call->rxnet = rxnet;
183 call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
184 atomic_inc(&rxnet->nr_calls);
185 return call;
186}
187
188/*
189 * Allocate a new client call.
190 */
191static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
192 struct rxrpc_conn_parameters *cp,
193 struct rxrpc_call_params *p,
194 gfp_t gfp,
195 unsigned int debug_id)
196{
197 struct rxrpc_call *call;
198 ktime_t now;
199 int ret;
200
201 _enter("");
202
203 call = rxrpc_alloc_call(rx, gfp, debug_id);
204 if (!call)
205 return ERR_PTR(-ENOMEM);
206 now = ktime_get_real();
207 call->acks_latest_ts = now;
208 call->cong_tstamp = now;
209 call->dest_srx = cp->peer->srx;
210 call->dest_srx.srx_service = cp->service_id;
211 call->interruptibility = p->interruptibility;
212 call->tx_total_len = p->tx_total_len;
213 call->key = key_get(cp->key);
214 call->peer = rxrpc_get_peer(cp->peer, rxrpc_peer_get_call);
215 call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call);
216 call->security_level = cp->security_level;
217 if (p->kernel)
218 __set_bit(RXRPC_CALL_KERNEL, &call->flags);
219 if (cp->upgrade)
220 __set_bit(RXRPC_CALL_UPGRADE, &call->flags);
221 if (cp->exclusive)
222 __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
223
224 if (p->timeouts.normal)
225 call->next_rx_timo = umin(p->timeouts.normal, 1);
226 if (p->timeouts.idle)
227 call->next_req_timo = umin(p->timeouts.idle, 1);
228 if (p->timeouts.hard)
229 call->hard_timo = p->timeouts.hard;
230
231 ret = rxrpc_init_client_call_security(call);
232 if (ret < 0) {
233 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret);
234 rxrpc_put_call(call, rxrpc_call_put_discard_error);
235 return ERR_PTR(ret);
236 }
237
238 rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN);
239
240 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
241 p->user_call_ID, rxrpc_call_new_client);
242
243 _leave(" = %p", call);
244 return call;
245}
246
247/*
248 * Initiate the call ack/resend/expiry timer.
249 */
250void rxrpc_start_call_timer(struct rxrpc_call *call)
251{
252 if (call->hard_timo) {
253 ktime_t delay = ms_to_ktime(call->hard_timo * 1000);
254
255 call->expect_term_by = ktime_add(ktime_get_real(), delay);
256 trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard);
257 }
258 call->timer.expires = jiffies;
259}
260
261/*
262 * Wait for a call slot to become available.
263 */
264static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
265{
266 struct semaphore *limiter = &rxrpc_call_limiter;
267
268 if (p->kernel)
269 limiter = &rxrpc_kernel_call_limiter;
270 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
271 down(limiter);
272 return limiter;
273 }
274 return down_interruptible(limiter) < 0 ? NULL : limiter;
275}
276
277/*
278 * Release a call slot.
279 */
280static void rxrpc_put_call_slot(struct rxrpc_call *call)
281{
282 struct semaphore *limiter = &rxrpc_call_limiter;
283
284 if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
285 limiter = &rxrpc_kernel_call_limiter;
286 up(limiter);
287}
288
289/*
290 * Start the process of connecting a call. We obtain a peer and a connection
291 * bundle, but the actual association of a call with a connection is offloaded
292 * to the I/O thread to simplify locking.
293 */
294static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
295{
296 struct rxrpc_local *local = call->local;
297 int ret = -ENOMEM;
298
299 _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
300
301 ret = rxrpc_look_up_bundle(call, gfp);
302 if (ret < 0)
303 goto error;
304
305 trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
306 rxrpc_get_call(call, rxrpc_call_get_io_thread);
307 spin_lock_irq(&local->client_call_lock);
308 list_add_tail(&call->wait_link, &local->new_client_calls);
309 spin_unlock_irq(&local->client_call_lock);
310 rxrpc_wake_up_io_thread(local);
311 return 0;
312
313error:
314 __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
315 return ret;
316}
317
318/*
319 * Set up a call for the given parameters.
320 * - Called with the socket lock held, which it must release.
321 * - If it returns a call, the call's lock will need releasing by the caller.
322 */
323struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
324 struct rxrpc_conn_parameters *cp,
325 struct rxrpc_call_params *p,
326 gfp_t gfp,
327 unsigned int debug_id)
328 __releases(&rx->sk.sk_lock)
329 __acquires(&call->user_mutex)
330{
331 struct rxrpc_call *call, *xcall;
332 struct rxrpc_net *rxnet;
333 struct semaphore *limiter;
334 struct rb_node *parent, **pp;
335 int ret;
336
337 _enter("%p,%lx", rx, p->user_call_ID);
338
339 if (WARN_ON_ONCE(!cp->peer)) {
340 release_sock(&rx->sk);
341 return ERR_PTR(-EIO);
342 }
343
344 limiter = rxrpc_get_call_slot(p, gfp);
345 if (!limiter) {
346 release_sock(&rx->sk);
347 return ERR_PTR(-ERESTARTSYS);
348 }
349
350 call = rxrpc_alloc_client_call(rx, cp, p, gfp, debug_id);
351 if (IS_ERR(call)) {
352 release_sock(&rx->sk);
353 up(limiter);
354 _leave(" = %ld", PTR_ERR(call));
355 return call;
356 }
357
358 /* We need to protect a partially set up call against the user as we
359 * will be acting outside the socket lock.
360 */
361 mutex_lock(&call->user_mutex);
362
363 /* Publish the call, even though it is incompletely set up as yet */
364 write_lock(&rx->call_lock);
365
366 pp = &rx->calls.rb_node;
367 parent = NULL;
368 while (*pp) {
369 parent = *pp;
370 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
371
372 if (p->user_call_ID < xcall->user_call_ID)
373 pp = &(*pp)->rb_left;
374 else if (p->user_call_ID > xcall->user_call_ID)
375 pp = &(*pp)->rb_right;
376 else
377 goto error_dup_user_ID;
378 }
379
380 rcu_assign_pointer(call->socket, rx);
381 call->user_call_ID = p->user_call_ID;
382 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
383 rxrpc_get_call(call, rxrpc_call_get_userid);
384 rb_link_node(&call->sock_node, parent, pp);
385 rb_insert_color(&call->sock_node, &rx->calls);
386 list_add(&call->sock_link, &rx->sock_calls);
387
388 write_unlock(&rx->call_lock);
389
390 rxnet = call->rxnet;
391 spin_lock(&rxnet->call_lock);
392 list_add_tail_rcu(&call->link, &rxnet->calls);
393 spin_unlock(&rxnet->call_lock);
394
395 /* From this point on, the call is protected by its own lock. */
396 release_sock(&rx->sk);
397
398 /* Set up or get a connection record and set the protocol parameters,
399 * including channel number and call ID.
400 */
401 ret = rxrpc_connect_call(call, gfp);
402 if (ret < 0)
403 goto error_attached_to_socket;
404
405 _leave(" = %p [new]", call);
406 return call;
407
408 /* We unexpectedly found the user ID in the list after taking
409 * the call_lock. This shouldn't happen unless the user races
410 * with itself and tries to add the same user ID twice at the
411 * same time in different threads.
412 */
413error_dup_user_ID:
414 write_unlock(&rx->call_lock);
415 release_sock(&rx->sk);
416 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST);
417 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0,
418 rxrpc_call_see_userid_exists);
419 mutex_unlock(&call->user_mutex);
420 rxrpc_put_call(call, rxrpc_call_put_userid_exists);
421 _leave(" = -EEXIST");
422 return ERR_PTR(-EEXIST);
423
424 /* We got an error, but the call is attached to the socket and is in
425 * need of release. However, we might now race with recvmsg() when it
426 * completion notifies the socket. Return 0 from sys_sendmsg() and
427 * leave the error to recvmsg() to deal with.
428 */
429error_attached_to_socket:
430 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret,
431 rxrpc_call_see_connect_failed);
432 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
433 _leave(" = c=%08x [err]", call->debug_id);
434 return call;
435}
436
437/*
438 * Set up an incoming call. call->conn points to the connection.
439 * This is called with interrupts disabled and isn't allowed to fail.
440 */
441void rxrpc_incoming_call(struct rxrpc_sock *rx,
442 struct rxrpc_call *call,
443 struct sk_buff *skb)
444{
445 struct rxrpc_connection *conn = call->conn;
446 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
447 u32 chan;
448
449 _enter(",%d", call->conn->debug_id);
450
451 rcu_assign_pointer(call->socket, rx);
452 call->call_id = sp->hdr.callNumber;
453 call->dest_srx.srx_service = sp->hdr.serviceId;
454 call->cid = sp->hdr.cid;
455 call->cong_tstamp = skb->tstamp;
456
457 __set_bit(RXRPC_CALL_EXPOSED, &call->flags);
458 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
459
460 spin_lock(&conn->state_lock);
461
462 switch (conn->state) {
463 case RXRPC_CONN_SERVICE_UNSECURED:
464 case RXRPC_CONN_SERVICE_CHALLENGING:
465 __set_bit(RXRPC_CALL_CONN_CHALLENGING, &call->flags);
466 break;
467 case RXRPC_CONN_SERVICE:
468 break;
469
470 case RXRPC_CONN_ABORTED:
471 rxrpc_set_call_completion(call, conn->completion,
472 conn->abort_code, conn->error);
473 break;
474 default:
475 BUG();
476 }
477
478 rxrpc_get_call(call, rxrpc_call_get_io_thread);
479
480 /* Set the channel for this call. We don't get channel_lock as we're
481 * only defending against the data_ready handler (which we're called
482 * from) and the RESPONSE packet parser (which is only really
483 * interested in call_counter and can cope with a disagreement with the
484 * call pointer).
485 */
486 chan = sp->hdr.cid & RXRPC_CHANNELMASK;
487 conn->channels[chan].call_counter = call->call_id;
488 conn->channels[chan].call_id = call->call_id;
489 conn->channels[chan].call = call;
490 spin_unlock(&conn->state_lock);
491
492 spin_lock(&conn->peer->lock);
493 hlist_add_head(&call->error_link, &conn->peer->error_targets);
494 spin_unlock(&conn->peer->lock);
495
496 rxrpc_start_call_timer(call);
497 _leave("");
498}
499
500/*
501 * Note the re-emergence of a call.
502 */
503void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
504{
505 if (call) {
506 int r = refcount_read(&call->ref);
507
508 trace_rxrpc_call(call->debug_id, r, 0, why);
509 }
510}
511
512struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
513 enum rxrpc_call_trace why)
514{
515 int r;
516
517 if (!call || !__refcount_inc_not_zero(&call->ref, &r))
518 return NULL;
519 trace_rxrpc_call(call->debug_id, r + 1, 0, why);
520 return call;
521}
522
523/*
524 * Note the addition of a ref on a call.
525 */
526void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
527{
528 int r;
529
530 __refcount_inc(&call->ref, &r);
531 trace_rxrpc_call(call->debug_id, r + 1, 0, why);
532}
533
534/*
535 * Clean up the transmission buffers.
536 */
537static void rxrpc_cleanup_tx_buffers(struct rxrpc_call *call)
538{
539 struct rxrpc_txqueue *tq, *next;
540
541 for (tq = call->tx_queue; tq; tq = next) {
542 next = tq->next;
543 for (int i = 0; i < RXRPC_NR_TXQUEUE; i++)
544 if (tq->bufs[i])
545 rxrpc_put_txbuf(tq->bufs[i], rxrpc_txbuf_put_cleaned);
546 trace_rxrpc_tq(call, tq, 0, rxrpc_tq_cleaned);
547 kfree(tq);
548 }
549}
550
551/*
552 * Clean up the receive buffers.
553 */
554static void rxrpc_cleanup_rx_buffers(struct rxrpc_call *call)
555{
556 rxrpc_purge_queue(&call->recvmsg_queue);
557 rxrpc_purge_queue(&call->rx_queue);
558 rxrpc_purge_queue(&call->rx_oos_queue);
559 kfree(call->rx_dec_buffer);
560}
561
562/*
563 * Detach a call from its owning socket.
564 */
565void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
566{
567 struct rxrpc_connection *conn = call->conn;
568 bool putu = false;
569
570 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
571
572 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
573 call->flags, rxrpc_call_see_release);
574
575 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
576 BUG();
577
578 rxrpc_put_call_slot(call);
579
580 /* Note that at this point, the call may still be on or may have been
581 * added back on to the socket receive queue. recvmsg() must discard
582 * released calls. The CALL_RELEASED flag should prevent further
583 * notifications.
584 */
585 spin_lock_irq(&rx->recvmsg_lock);
586 spin_unlock_irq(&rx->recvmsg_lock);
587
588 write_lock(&rx->call_lock);
589
590 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
591 rb_erase(&call->sock_node, &rx->calls);
592 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
593 putu = true;
594 }
595
596 list_del(&call->sock_link);
597 write_unlock(&rx->call_lock);
598
599 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
600
601 if (putu)
602 rxrpc_put_call(call, rxrpc_call_put_userid);
603
604 _leave("");
605}
606
607/*
608 * release all the calls associated with a socket
609 */
610void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
611{
612 struct rxrpc_call *call;
613
614 _enter("%p", rx);
615
616 while (!list_empty(&rx->to_be_accepted)) {
617 call = list_entry(rx->to_be_accepted.next,
618 struct rxrpc_call, accept_link);
619 list_del(&call->accept_link);
620 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
621 rxrpc_abort_call_sock_release_tba);
622 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
623 }
624
625 while (!list_empty(&rx->sock_calls)) {
626 call = list_entry(rx->sock_calls.next,
627 struct rxrpc_call, sock_link);
628 rxrpc_get_call(call, rxrpc_call_get_release_sock);
629 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
630 rxrpc_abort_call_sock_release);
631 rxrpc_release_call(rx, call);
632 rxrpc_put_call(call, rxrpc_call_put_release_sock);
633 }
634
635 while ((call = list_first_entry_or_null(&rx->recvmsg_q,
636 struct rxrpc_call, recvmsg_link))) {
637 list_del_init(&call->recvmsg_link);
638 rxrpc_put_call(call, rxrpc_call_put_release_recvmsg_q);
639 }
640
641 _leave("");
642}
643
644/*
645 * release a call
646 */
647void 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 spin_lock(&rxnet->call_lock);
662 list_del_rcu(&call->link);
663 spin_unlock(&rxnet->call_lock);
664
665 rxrpc_cleanup_call(call);
666 }
667}
668
669/*
670 * Free up the call under RCU.
671 */
672static void rxrpc_rcu_free_call(struct rcu_head *rcu)
673{
674 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
675 struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
676
677 kmem_cache_free(rxrpc_call_jar, call);
678 if (atomic_dec_and_test(&rxnet->nr_calls))
679 wake_up_var(&rxnet->nr_calls);
680}
681
682/*
683 * Final call destruction - but must be done in process context.
684 */
685static void rxrpc_destroy_call(struct work_struct *work)
686{
687 struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
688
689 timer_delete_sync(&call->timer);
690
691 rxrpc_cleanup_tx_buffers(call);
692 rxrpc_cleanup_rx_buffers(call);
693 rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
694 rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
695 rxrpc_deactivate_bundle(call->bundle);
696 rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
697 rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
698 rxrpc_put_local(call->local, rxrpc_local_put_call);
699 key_put(call->key);
700 call_rcu(&call->rcu, rxrpc_rcu_free_call);
701}
702
703/*
704 * clean up a call
705 */
706void rxrpc_cleanup_call(struct rxrpc_call *call)
707{
708 memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
709
710 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
711 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
712
713 timer_delete(&call->timer);
714
715 if (rcu_read_lock_held())
716 /* Can't use the rxrpc workqueue as we need to cancel/flush
717 * something that may be running/waiting there.
718 */
719 schedule_work(&call->destroyer);
720 else
721 rxrpc_destroy_call(&call->destroyer);
722}
723
724/*
725 * Make sure that all calls are gone from a network namespace. To reach this
726 * point, any open UDP sockets in that namespace must have been closed, so any
727 * outstanding calls cannot be doing I/O.
728 */
729void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
730{
731 struct rxrpc_call *call;
732
733 _enter("");
734
735 if (!list_empty(&rxnet->calls)) {
736 int shown = 0;
737
738 spin_lock(&rxnet->call_lock);
739
740 list_for_each_entry(call, &rxnet->calls, link) {
741 rxrpc_see_call(call, rxrpc_call_see_still_live);
742
743 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
744 call, refcount_read(&call->ref),
745 rxrpc_call_states[__rxrpc_call_state(call)],
746 call->flags, call->events);
747
748 if (++shown >= 10)
749 break;
750 }
751
752 spin_unlock(&rxnet->call_lock);
753 }
754
755 atomic_dec(&rxnet->nr_calls);
756 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
757}
758
759/**
760 * rxrpc_kernel_query_call_security - Query call's security parameters
761 * @call: The call to query
762 * @_service_id: Where to return the service ID
763 * @_enctype: Where to return the "encoding type"
764 *
765 * This queries the security parameters of a call, setting *@_service_id and
766 * *@_enctype and returning the security class.
767 *
768 * Return: The security class protocol number.
769 */
770u8 rxrpc_kernel_query_call_security(struct rxrpc_call *call,
771 u16 *_service_id, u32 *_enctype)
772{
773 *_service_id = call->dest_srx.srx_service;
774 *_enctype = call->security_enctype;
775 return call->security_ix;
776}
777EXPORT_SYMBOL(rxrpc_kernel_query_call_security);