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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
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_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_SECURING] = "SvSecure",
26 [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
27 [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
28 [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
29 [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
30 [RXRPC_CALL_COMPLETE] = "Complete",
31};
32
33const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
34 [RXRPC_CALL_SUCCEEDED] = "Complete",
35 [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
36 [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
37 [RXRPC_CALL_LOCAL_ERROR] = "LocError",
38 [RXRPC_CALL_NETWORK_ERROR] = "NetError",
39};
40
41struct kmem_cache *rxrpc_call_jar;
42
43static struct semaphore rxrpc_call_limiter =
44 __SEMAPHORE_INITIALIZER(rxrpc_call_limiter, 1000);
45static struct semaphore rxrpc_kernel_call_limiter =
46 __SEMAPHORE_INITIALIZER(rxrpc_kernel_call_limiter, 1000);
47
48void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what)
49{
50 struct rxrpc_local *local = call->local;
51 bool busy;
52
53 if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) {
54 spin_lock_bh(&local->lock);
55 busy = !list_empty(&call->attend_link);
56 trace_rxrpc_poke_call(call, busy, what);
57 if (!busy) {
58 rxrpc_get_call(call, rxrpc_call_get_poke);
59 list_add_tail(&call->attend_link, &local->call_attend_q);
60 }
61 spin_unlock_bh(&local->lock);
62 rxrpc_wake_up_io_thread(local);
63 }
64}
65
66static void rxrpc_call_timer_expired(struct timer_list *t)
67{
68 struct rxrpc_call *call = from_timer(call, t, timer);
69
70 _enter("%d", call->debug_id);
71
72 if (!__rxrpc_call_is_complete(call)) {
73 trace_rxrpc_timer_expired(call, jiffies);
74 rxrpc_poke_call(call, rxrpc_call_poke_timer);
75 }
76}
77
78void rxrpc_reduce_call_timer(struct rxrpc_call *call,
79 unsigned long expire_at,
80 unsigned long now,
81 enum rxrpc_timer_trace why)
82{
83 trace_rxrpc_timer(call, why, now);
84 timer_reduce(&call->timer, expire_at);
85}
86
87static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
88
89static void rxrpc_destroy_call(struct work_struct *);
90
91/*
92 * find an extant server call
93 * - called in process context with IRQs enabled
94 */
95struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
96 unsigned long user_call_ID)
97{
98 struct rxrpc_call *call;
99 struct rb_node *p;
100
101 _enter("%p,%lx", rx, user_call_ID);
102
103 read_lock(&rx->call_lock);
104
105 p = rx->calls.rb_node;
106 while (p) {
107 call = rb_entry(p, struct rxrpc_call, sock_node);
108
109 if (user_call_ID < call->user_call_ID)
110 p = p->rb_left;
111 else if (user_call_ID > call->user_call_ID)
112 p = p->rb_right;
113 else
114 goto found_extant_call;
115 }
116
117 read_unlock(&rx->call_lock);
118 _leave(" = NULL");
119 return NULL;
120
121found_extant_call:
122 rxrpc_get_call(call, rxrpc_call_get_sendmsg);
123 read_unlock(&rx->call_lock);
124 _leave(" = %p [%d]", call, refcount_read(&call->ref));
125 return call;
126}
127
128/*
129 * allocate a new call
130 */
131struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
132 unsigned int debug_id)
133{
134 struct rxrpc_call *call;
135 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
136
137 call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
138 if (!call)
139 return NULL;
140
141 mutex_init(&call->user_mutex);
142
143 /* Prevent lockdep reporting a deadlock false positive between the afs
144 * filesystem and sys_sendmsg() via the mmap sem.
145 */
146 if (rx->sk.sk_kern_sock)
147 lockdep_set_class(&call->user_mutex,
148 &rxrpc_call_user_mutex_lock_class_key);
149
150 timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
151 INIT_WORK(&call->destroyer, rxrpc_destroy_call);
152 INIT_LIST_HEAD(&call->link);
153 INIT_LIST_HEAD(&call->wait_link);
154 INIT_LIST_HEAD(&call->accept_link);
155 INIT_LIST_HEAD(&call->recvmsg_link);
156 INIT_LIST_HEAD(&call->sock_link);
157 INIT_LIST_HEAD(&call->attend_link);
158 INIT_LIST_HEAD(&call->tx_sendmsg);
159 INIT_LIST_HEAD(&call->tx_buffer);
160 skb_queue_head_init(&call->recvmsg_queue);
161 skb_queue_head_init(&call->rx_oos_queue);
162 init_waitqueue_head(&call->waitq);
163 spin_lock_init(&call->notify_lock);
164 spin_lock_init(&call->tx_lock);
165 refcount_set(&call->ref, 1);
166 call->debug_id = debug_id;
167 call->tx_total_len = -1;
168 call->next_rx_timo = 20 * HZ;
169 call->next_req_timo = 1 * HZ;
170 atomic64_set(&call->ackr_window, 0x100000001ULL);
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 if (RXRPC_TX_SMSS > 2190)
178 call->cong_cwnd = 2;
179 else if (RXRPC_TX_SMSS > 1095)
180 call->cong_cwnd = 3;
181 else
182 call->cong_cwnd = 4;
183 call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
184
185 call->rxnet = rxnet;
186 call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
187 atomic_inc(&rxnet->nr_calls);
188 return call;
189}
190
191/*
192 * Allocate a new client call.
193 */
194static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
195 struct sockaddr_rxrpc *srx,
196 struct rxrpc_conn_parameters *cp,
197 struct rxrpc_call_params *p,
198 gfp_t gfp,
199 unsigned int debug_id)
200{
201 struct rxrpc_call *call;
202 ktime_t now;
203 int ret;
204
205 _enter("");
206
207 call = rxrpc_alloc_call(rx, gfp, debug_id);
208 if (!call)
209 return ERR_PTR(-ENOMEM);
210 now = ktime_get_real();
211 call->acks_latest_ts = now;
212 call->cong_tstamp = now;
213 call->dest_srx = *srx;
214 call->interruptibility = p->interruptibility;
215 call->tx_total_len = p->tx_total_len;
216 call->key = key_get(cp->key);
217 call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call);
218 call->security_level = cp->security_level;
219 if (p->kernel)
220 __set_bit(RXRPC_CALL_KERNEL, &call->flags);
221 if (cp->upgrade)
222 __set_bit(RXRPC_CALL_UPGRADE, &call->flags);
223 if (cp->exclusive)
224 __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags);
225
226 ret = rxrpc_init_client_call_security(call);
227 if (ret < 0) {
228 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret);
229 rxrpc_put_call(call, rxrpc_call_put_discard_error);
230 return ERR_PTR(ret);
231 }
232
233 rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN);
234
235 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
236 p->user_call_ID, rxrpc_call_new_client);
237
238 _leave(" = %p", call);
239 return call;
240}
241
242/*
243 * Initiate the call ack/resend/expiry timer.
244 */
245void rxrpc_start_call_timer(struct rxrpc_call *call)
246{
247 unsigned long now = jiffies;
248 unsigned long j = now + MAX_JIFFY_OFFSET;
249
250 call->delay_ack_at = j;
251 call->ack_lost_at = j;
252 call->resend_at = j;
253 call->ping_at = j;
254 call->keepalive_at = j;
255 call->expect_rx_by = j;
256 call->expect_req_by = j;
257 call->expect_term_by = j;
258 call->timer.expires = now;
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 call->peer = rxrpc_lookup_peer(local, &call->dest_srx, gfp);
302 if (!call->peer)
303 goto error;
304
305 ret = rxrpc_look_up_bundle(call, gfp);
306 if (ret < 0)
307 goto error;
308
309 trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
310 rxrpc_get_call(call, rxrpc_call_get_io_thread);
311 spin_lock(&local->client_call_lock);
312 list_add_tail(&call->wait_link, &local->new_client_calls);
313 spin_unlock(&local->client_call_lock);
314 rxrpc_wake_up_io_thread(local);
315 return 0;
316
317error:
318 __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
319 return ret;
320}
321
322/*
323 * Set up a call for the given parameters.
324 * - Called with the socket lock held, which it must release.
325 * - If it returns a call, the call's lock will need releasing by the caller.
326 */
327struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
328 struct rxrpc_conn_parameters *cp,
329 struct sockaddr_rxrpc *srx,
330 struct rxrpc_call_params *p,
331 gfp_t gfp,
332 unsigned int debug_id)
333 __releases(&rx->sk.sk_lock.slock)
334 __acquires(&call->user_mutex)
335{
336 struct rxrpc_call *call, *xcall;
337 struct rxrpc_net *rxnet;
338 struct semaphore *limiter;
339 struct rb_node *parent, **pp;
340 int ret;
341
342 _enter("%p,%lx", rx, p->user_call_ID);
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, srx, 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 in BH context 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_SECURING);
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 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
466 break;
467 case RXRPC_CONN_SERVICE:
468 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
469 break;
470
471 case RXRPC_CONN_ABORTED:
472 rxrpc_set_call_completion(call, conn->completion,
473 conn->abort_code, conn->error);
474 break;
475 default:
476 BUG();
477 }
478
479 rxrpc_get_call(call, rxrpc_call_get_io_thread);
480
481 /* Set the channel for this call. We don't get channel_lock as we're
482 * only defending against the data_ready handler (which we're called
483 * from) and the RESPONSE packet parser (which is only really
484 * interested in call_counter and can cope with a disagreement with the
485 * call pointer).
486 */
487 chan = sp->hdr.cid & RXRPC_CHANNELMASK;
488 conn->channels[chan].call_counter = call->call_id;
489 conn->channels[chan].call_id = call->call_id;
490 conn->channels[chan].call = call;
491 spin_unlock(&conn->state_lock);
492
493 spin_lock(&conn->peer->lock);
494 hlist_add_head(&call->error_link, &conn->peer->error_targets);
495 spin_unlock(&conn->peer->lock);
496
497 rxrpc_start_call_timer(call);
498 _leave("");
499}
500
501/*
502 * Note the re-emergence of a call.
503 */
504void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
505{
506 if (call) {
507 int r = refcount_read(&call->ref);
508
509 trace_rxrpc_call(call->debug_id, r, 0, why);
510 }
511}
512
513struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
514 enum rxrpc_call_trace why)
515{
516 int r;
517
518 if (!call || !__refcount_inc_not_zero(&call->ref, &r))
519 return NULL;
520 trace_rxrpc_call(call->debug_id, r + 1, 0, why);
521 return call;
522}
523
524/*
525 * Note the addition of a ref on a call.
526 */
527void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
528{
529 int r;
530
531 __refcount_inc(&call->ref, &r);
532 trace_rxrpc_call(call->debug_id, r + 1, 0, why);
533}
534
535/*
536 * Clean up the Rx skb ring.
537 */
538static void rxrpc_cleanup_ring(struct rxrpc_call *call)
539{
540 skb_queue_purge(&call->recvmsg_queue);
541 skb_queue_purge(&call->rx_oos_queue);
542}
543
544/*
545 * Detach a call from its owning socket.
546 */
547void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
548{
549 struct rxrpc_connection *conn = call->conn;
550 bool put = false, putu = false;
551
552 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
553
554 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
555 call->flags, rxrpc_call_see_release);
556
557 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
558 BUG();
559
560 rxrpc_put_call_slot(call);
561
562 /* Make sure we don't get any more notifications */
563 write_lock(&rx->recvmsg_lock);
564
565 if (!list_empty(&call->recvmsg_link)) {
566 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
567 call, call->events, call->flags);
568 list_del(&call->recvmsg_link);
569 put = true;
570 }
571
572 /* list_empty() must return false in rxrpc_notify_socket() */
573 call->recvmsg_link.next = NULL;
574 call->recvmsg_link.prev = NULL;
575
576 write_unlock(&rx->recvmsg_lock);
577 if (put)
578 rxrpc_put_call(call, rxrpc_call_put_unnotify);
579
580 write_lock(&rx->call_lock);
581
582 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
583 rb_erase(&call->sock_node, &rx->calls);
584 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
585 putu = true;
586 }
587
588 list_del(&call->sock_link);
589 write_unlock(&rx->call_lock);
590
591 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
592
593 if (putu)
594 rxrpc_put_call(call, rxrpc_call_put_userid);
595
596 _leave("");
597}
598
599/*
600 * release all the calls associated with a socket
601 */
602void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
603{
604 struct rxrpc_call *call;
605
606 _enter("%p", rx);
607
608 while (!list_empty(&rx->to_be_accepted)) {
609 call = list_entry(rx->to_be_accepted.next,
610 struct rxrpc_call, accept_link);
611 list_del(&call->accept_link);
612 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
613 rxrpc_abort_call_sock_release_tba);
614 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
615 }
616
617 while (!list_empty(&rx->sock_calls)) {
618 call = list_entry(rx->sock_calls.next,
619 struct rxrpc_call, sock_link);
620 rxrpc_get_call(call, rxrpc_call_get_release_sock);
621 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
622 rxrpc_abort_call_sock_release);
623 rxrpc_release_call(rx, call);
624 rxrpc_put_call(call, rxrpc_call_put_release_sock);
625 }
626
627 _leave("");
628}
629
630/*
631 * release a call
632 */
633void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
634{
635 struct rxrpc_net *rxnet = call->rxnet;
636 unsigned int debug_id = call->debug_id;
637 bool dead;
638 int r;
639
640 ASSERT(call != NULL);
641
642 dead = __refcount_dec_and_test(&call->ref, &r);
643 trace_rxrpc_call(debug_id, r - 1, 0, why);
644 if (dead) {
645 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
646
647 if (!list_empty(&call->link)) {
648 spin_lock(&rxnet->call_lock);
649 list_del_init(&call->link);
650 spin_unlock(&rxnet->call_lock);
651 }
652
653 rxrpc_cleanup_call(call);
654 }
655}
656
657/*
658 * Free up the call under RCU.
659 */
660static void rxrpc_rcu_free_call(struct rcu_head *rcu)
661{
662 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
663 struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
664
665 kmem_cache_free(rxrpc_call_jar, call);
666 if (atomic_dec_and_test(&rxnet->nr_calls))
667 wake_up_var(&rxnet->nr_calls);
668}
669
670/*
671 * Final call destruction - but must be done in process context.
672 */
673static void rxrpc_destroy_call(struct work_struct *work)
674{
675 struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
676 struct rxrpc_txbuf *txb;
677
678 del_timer_sync(&call->timer);
679
680 rxrpc_cleanup_ring(call);
681 while ((txb = list_first_entry_or_null(&call->tx_sendmsg,
682 struct rxrpc_txbuf, call_link))) {
683 list_del(&txb->call_link);
684 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
685 }
686 while ((txb = list_first_entry_or_null(&call->tx_buffer,
687 struct rxrpc_txbuf, call_link))) {
688 list_del(&txb->call_link);
689 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
690 }
691
692 rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
693 rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
694 rxrpc_deactivate_bundle(call->bundle);
695 rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
696 rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
697 rxrpc_put_local(call->local, rxrpc_local_put_call);
698 call_rcu(&call->rcu, rxrpc_rcu_free_call);
699}
700
701/*
702 * clean up a call
703 */
704void 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 del_timer(&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 */
727void 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 spin_lock(&rxnet->call_lock);
735
736 while (!list_empty(&rxnet->calls)) {
737 call = list_entry(rxnet->calls.next,
738 struct rxrpc_call, link);
739 _debug("Zapping call %p", call);
740
741 rxrpc_see_call(call, rxrpc_call_see_zap);
742 list_del_init(&call->link);
743
744 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
745 call, refcount_read(&call->ref),
746 rxrpc_call_states[__rxrpc_call_state(call)],
747 call->flags, call->events);
748
749 spin_unlock(&rxnet->call_lock);
750 cond_resched();
751 spin_lock(&rxnet->call_lock);
752 }
753
754 spin_unlock(&rxnet->call_lock);
755 }
756
757 atomic_dec(&rxnet->nr_calls);
758 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
759}
1/* RxRPC individual remote procedure call handling
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/slab.h>
15#include <linux/module.h>
16#include <linux/circ_buf.h>
17#include <linux/spinlock_types.h>
18#include <net/sock.h>
19#include <net/af_rxrpc.h>
20#include "ar-internal.h"
21
22const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
23 [RXRPC_CALL_UNINITIALISED] = "Uninit ",
24 [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn",
25 [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
26 [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
27 [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
28 [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc",
29 [RXRPC_CALL_SERVER_SECURING] = "SvSecure",
30 [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept",
31 [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
32 [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
33 [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
34 [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
35 [RXRPC_CALL_COMPLETE] = "Complete",
36};
37
38const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
39 [RXRPC_CALL_SUCCEEDED] = "Complete",
40 [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
41 [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
42 [RXRPC_CALL_LOCAL_ERROR] = "LocError",
43 [RXRPC_CALL_NETWORK_ERROR] = "NetError",
44};
45
46const char rxrpc_call_traces[rxrpc_call__nr_trace][4] = {
47 [rxrpc_call_new_client] = "NWc",
48 [rxrpc_call_new_service] = "NWs",
49 [rxrpc_call_queued] = "QUE",
50 [rxrpc_call_queued_ref] = "QUR",
51 [rxrpc_call_connected] = "CON",
52 [rxrpc_call_release] = "RLS",
53 [rxrpc_call_seen] = "SEE",
54 [rxrpc_call_got] = "GOT",
55 [rxrpc_call_got_userid] = "Gus",
56 [rxrpc_call_got_kernel] = "Gke",
57 [rxrpc_call_put] = "PUT",
58 [rxrpc_call_put_userid] = "Pus",
59 [rxrpc_call_put_kernel] = "Pke",
60 [rxrpc_call_put_noqueue] = "PNQ",
61 [rxrpc_call_error] = "*E*",
62};
63
64struct kmem_cache *rxrpc_call_jar;
65LIST_HEAD(rxrpc_calls);
66DEFINE_RWLOCK(rxrpc_call_lock);
67
68static void rxrpc_call_timer_expired(unsigned long _call)
69{
70 struct rxrpc_call *call = (struct rxrpc_call *)_call;
71
72 _enter("%d", call->debug_id);
73
74 if (call->state < RXRPC_CALL_COMPLETE)
75 rxrpc_set_timer(call, rxrpc_timer_expired, ktime_get_real());
76}
77
78/*
79 * find an extant server call
80 * - called in process context with IRQs enabled
81 */
82struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
83 unsigned long user_call_ID)
84{
85 struct rxrpc_call *call;
86 struct rb_node *p;
87
88 _enter("%p,%lx", rx, user_call_ID);
89
90 read_lock(&rx->call_lock);
91
92 p = rx->calls.rb_node;
93 while (p) {
94 call = rb_entry(p, struct rxrpc_call, sock_node);
95
96 if (user_call_ID < call->user_call_ID)
97 p = p->rb_left;
98 else if (user_call_ID > call->user_call_ID)
99 p = p->rb_right;
100 else
101 goto found_extant_call;
102 }
103
104 read_unlock(&rx->call_lock);
105 _leave(" = NULL");
106 return NULL;
107
108found_extant_call:
109 rxrpc_get_call(call, rxrpc_call_got);
110 read_unlock(&rx->call_lock);
111 _leave(" = %p [%d]", call, atomic_read(&call->usage));
112 return call;
113}
114
115/*
116 * allocate a new call
117 */
118struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
119{
120 struct rxrpc_call *call;
121
122 call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
123 if (!call)
124 return NULL;
125
126 call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
127 sizeof(struct sk_buff *),
128 gfp);
129 if (!call->rxtx_buffer)
130 goto nomem;
131
132 call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
133 if (!call->rxtx_annotations)
134 goto nomem_2;
135
136 setup_timer(&call->timer, rxrpc_call_timer_expired,
137 (unsigned long)call);
138 INIT_WORK(&call->processor, &rxrpc_process_call);
139 INIT_LIST_HEAD(&call->link);
140 INIT_LIST_HEAD(&call->chan_wait_link);
141 INIT_LIST_HEAD(&call->accept_link);
142 INIT_LIST_HEAD(&call->recvmsg_link);
143 INIT_LIST_HEAD(&call->sock_link);
144 init_waitqueue_head(&call->waitq);
145 spin_lock_init(&call->lock);
146 rwlock_init(&call->state_lock);
147 atomic_set(&call->usage, 1);
148 call->debug_id = atomic_inc_return(&rxrpc_debug_id);
149
150 memset(&call->sock_node, 0xed, sizeof(call->sock_node));
151
152 /* Leave space in the ring to handle a maxed-out jumbo packet */
153 call->rx_winsize = rxrpc_rx_window_size;
154 call->tx_winsize = 16;
155 call->rx_expect_next = 1;
156
157 if (RXRPC_TX_SMSS > 2190)
158 call->cong_cwnd = 2;
159 else if (RXRPC_TX_SMSS > 1095)
160 call->cong_cwnd = 3;
161 else
162 call->cong_cwnd = 4;
163 call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1;
164 return call;
165
166nomem_2:
167 kfree(call->rxtx_buffer);
168nomem:
169 kmem_cache_free(rxrpc_call_jar, call);
170 return NULL;
171}
172
173/*
174 * Allocate a new client call.
175 */
176static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx,
177 gfp_t gfp)
178{
179 struct rxrpc_call *call;
180 ktime_t now;
181
182 _enter("");
183
184 call = rxrpc_alloc_call(gfp);
185 if (!call)
186 return ERR_PTR(-ENOMEM);
187 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
188 call->service_id = srx->srx_service;
189 call->tx_phase = true;
190 now = ktime_get_real();
191 call->acks_latest_ts = now;
192 call->cong_tstamp = now;
193
194 _leave(" = %p", call);
195 return call;
196}
197
198/*
199 * Initiate the call ack/resend/expiry timer.
200 */
201static void rxrpc_start_call_timer(struct rxrpc_call *call)
202{
203 ktime_t now = ktime_get_real(), expire_at;
204
205 expire_at = ktime_add_ms(now, rxrpc_max_call_lifetime);
206 call->expire_at = expire_at;
207 call->ack_at = expire_at;
208 call->ping_at = expire_at;
209 call->resend_at = expire_at;
210 call->timer.expires = jiffies + LONG_MAX / 2;
211 rxrpc_set_timer(call, rxrpc_timer_begin, now);
212}
213
214/*
215 * set up a call for the given data
216 * - called in process context with IRQs enabled
217 */
218struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
219 struct rxrpc_conn_parameters *cp,
220 struct sockaddr_rxrpc *srx,
221 unsigned long user_call_ID,
222 gfp_t gfp)
223{
224 struct rxrpc_call *call, *xcall;
225 struct rb_node *parent, **pp;
226 const void *here = __builtin_return_address(0);
227 int ret;
228
229 _enter("%p,%lx", rx, user_call_ID);
230
231 call = rxrpc_alloc_client_call(srx, gfp);
232 if (IS_ERR(call)) {
233 _leave(" = %ld", PTR_ERR(call));
234 return call;
235 }
236
237 trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage),
238 here, (const void *)user_call_ID);
239
240 /* Publish the call, even though it is incompletely set up as yet */
241 write_lock(&rx->call_lock);
242
243 pp = &rx->calls.rb_node;
244 parent = NULL;
245 while (*pp) {
246 parent = *pp;
247 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
248
249 if (user_call_ID < xcall->user_call_ID)
250 pp = &(*pp)->rb_left;
251 else if (user_call_ID > xcall->user_call_ID)
252 pp = &(*pp)->rb_right;
253 else
254 goto error_dup_user_ID;
255 }
256
257 rcu_assign_pointer(call->socket, rx);
258 call->user_call_ID = user_call_ID;
259 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
260 rxrpc_get_call(call, rxrpc_call_got_userid);
261 rb_link_node(&call->sock_node, parent, pp);
262 rb_insert_color(&call->sock_node, &rx->calls);
263 list_add(&call->sock_link, &rx->sock_calls);
264
265 write_unlock(&rx->call_lock);
266
267 write_lock(&rxrpc_call_lock);
268 list_add_tail(&call->link, &rxrpc_calls);
269 write_unlock(&rxrpc_call_lock);
270
271 /* Set up or get a connection record and set the protocol parameters,
272 * including channel number and call ID.
273 */
274 ret = rxrpc_connect_call(call, cp, srx, gfp);
275 if (ret < 0)
276 goto error;
277
278 trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage),
279 here, NULL);
280
281 spin_lock_bh(&call->conn->params.peer->lock);
282 hlist_add_head(&call->error_link,
283 &call->conn->params.peer->error_targets);
284 spin_unlock_bh(&call->conn->params.peer->lock);
285
286 rxrpc_start_call_timer(call);
287
288 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
289
290 _leave(" = %p [new]", call);
291 return call;
292
293 /* We unexpectedly found the user ID in the list after taking
294 * the call_lock. This shouldn't happen unless the user races
295 * with itself and tries to add the same user ID twice at the
296 * same time in different threads.
297 */
298error_dup_user_ID:
299 write_unlock(&rx->call_lock);
300 ret = -EEXIST;
301
302error:
303 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
304 RX_CALL_DEAD, ret);
305 trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
306 here, ERR_PTR(ret));
307 rxrpc_release_call(rx, call);
308 rxrpc_put_call(call, rxrpc_call_put);
309 _leave(" = %d", ret);
310 return ERR_PTR(ret);
311}
312
313/*
314 * Set up an incoming call. call->conn points to the connection.
315 * This is called in BH context and isn't allowed to fail.
316 */
317void rxrpc_incoming_call(struct rxrpc_sock *rx,
318 struct rxrpc_call *call,
319 struct sk_buff *skb)
320{
321 struct rxrpc_connection *conn = call->conn;
322 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
323 u32 chan;
324
325 _enter(",%d", call->conn->debug_id);
326
327 rcu_assign_pointer(call->socket, rx);
328 call->call_id = sp->hdr.callNumber;
329 call->service_id = sp->hdr.serviceId;
330 call->cid = sp->hdr.cid;
331 call->state = RXRPC_CALL_SERVER_ACCEPTING;
332 if (sp->hdr.securityIndex > 0)
333 call->state = RXRPC_CALL_SERVER_SECURING;
334 call->cong_tstamp = skb->tstamp;
335
336 /* Set the channel for this call. We don't get channel_lock as we're
337 * only defending against the data_ready handler (which we're called
338 * from) and the RESPONSE packet parser (which is only really
339 * interested in call_counter and can cope with a disagreement with the
340 * call pointer).
341 */
342 chan = sp->hdr.cid & RXRPC_CHANNELMASK;
343 conn->channels[chan].call_counter = call->call_id;
344 conn->channels[chan].call_id = call->call_id;
345 rcu_assign_pointer(conn->channels[chan].call, call);
346
347 spin_lock(&conn->params.peer->lock);
348 hlist_add_head(&call->error_link, &conn->params.peer->error_targets);
349 spin_unlock(&conn->params.peer->lock);
350
351 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
352
353 rxrpc_start_call_timer(call);
354 _leave("");
355}
356
357/*
358 * Queue a call's work processor, getting a ref to pass to the work queue.
359 */
360bool rxrpc_queue_call(struct rxrpc_call *call)
361{
362 const void *here = __builtin_return_address(0);
363 int n = __atomic_add_unless(&call->usage, 1, 0);
364 if (n == 0)
365 return false;
366 if (rxrpc_queue_work(&call->processor))
367 trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL);
368 else
369 rxrpc_put_call(call, rxrpc_call_put_noqueue);
370 return true;
371}
372
373/*
374 * Queue a call's work processor, passing the callers ref to the work queue.
375 */
376bool __rxrpc_queue_call(struct rxrpc_call *call)
377{
378 const void *here = __builtin_return_address(0);
379 int n = atomic_read(&call->usage);
380 ASSERTCMP(n, >=, 1);
381 if (rxrpc_queue_work(&call->processor))
382 trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL);
383 else
384 rxrpc_put_call(call, rxrpc_call_put_noqueue);
385 return true;
386}
387
388/*
389 * Note the re-emergence of a call.
390 */
391void rxrpc_see_call(struct rxrpc_call *call)
392{
393 const void *here = __builtin_return_address(0);
394 if (call) {
395 int n = atomic_read(&call->usage);
396
397 trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL);
398 }
399}
400
401/*
402 * Note the addition of a ref on a call.
403 */
404void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
405{
406 const void *here = __builtin_return_address(0);
407 int n = atomic_inc_return(&call->usage);
408
409 trace_rxrpc_call(call, op, n, here, NULL);
410}
411
412/*
413 * Detach a call from its owning socket.
414 */
415void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
416{
417 const void *here = __builtin_return_address(0);
418 struct rxrpc_connection *conn = call->conn;
419 bool put = false;
420 int i;
421
422 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
423
424 trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage),
425 here, (const void *)call->flags);
426
427 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
428
429 spin_lock_bh(&call->lock);
430 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
431 BUG();
432 spin_unlock_bh(&call->lock);
433
434 del_timer_sync(&call->timer);
435
436 /* Make sure we don't get any more notifications */
437 write_lock_bh(&rx->recvmsg_lock);
438
439 if (!list_empty(&call->recvmsg_link)) {
440 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
441 call, call->events, call->flags);
442 list_del(&call->recvmsg_link);
443 put = true;
444 }
445
446 /* list_empty() must return false in rxrpc_notify_socket() */
447 call->recvmsg_link.next = NULL;
448 call->recvmsg_link.prev = NULL;
449
450 write_unlock_bh(&rx->recvmsg_lock);
451 if (put)
452 rxrpc_put_call(call, rxrpc_call_put);
453
454 write_lock(&rx->call_lock);
455
456 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
457 rb_erase(&call->sock_node, &rx->calls);
458 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
459 rxrpc_put_call(call, rxrpc_call_put_userid);
460 }
461
462 list_del(&call->sock_link);
463 write_unlock(&rx->call_lock);
464
465 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
466
467 if (conn)
468 rxrpc_disconnect_call(call);
469
470 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
471 rxrpc_free_skb(call->rxtx_buffer[i],
472 (call->tx_phase ? rxrpc_skb_tx_cleaned :
473 rxrpc_skb_rx_cleaned));
474 call->rxtx_buffer[i] = NULL;
475 }
476
477 _leave("");
478}
479
480/*
481 * release all the calls associated with a socket
482 */
483void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
484{
485 struct rxrpc_call *call;
486
487 _enter("%p", rx);
488
489 while (!list_empty(&rx->to_be_accepted)) {
490 call = list_entry(rx->to_be_accepted.next,
491 struct rxrpc_call, accept_link);
492 list_del(&call->accept_link);
493 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, ECONNRESET);
494 rxrpc_put_call(call, rxrpc_call_put);
495 }
496
497 while (!list_empty(&rx->sock_calls)) {
498 call = list_entry(rx->sock_calls.next,
499 struct rxrpc_call, sock_link);
500 rxrpc_get_call(call, rxrpc_call_got);
501 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET);
502 rxrpc_send_abort_packet(call);
503 rxrpc_release_call(rx, call);
504 rxrpc_put_call(call, rxrpc_call_put);
505 }
506
507 _leave("");
508}
509
510/*
511 * release a call
512 */
513void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
514{
515 const void *here = __builtin_return_address(0);
516 int n;
517
518 ASSERT(call != NULL);
519
520 n = atomic_dec_return(&call->usage);
521 trace_rxrpc_call(call, op, n, here, NULL);
522 ASSERTCMP(n, >=, 0);
523 if (n == 0) {
524 _debug("call %d dead", call->debug_id);
525 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
526
527 write_lock(&rxrpc_call_lock);
528 list_del_init(&call->link);
529 write_unlock(&rxrpc_call_lock);
530
531 rxrpc_cleanup_call(call);
532 }
533}
534
535/*
536 * Final call destruction under RCU.
537 */
538static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
539{
540 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
541
542 rxrpc_put_peer(call->peer);
543 kfree(call->rxtx_buffer);
544 kfree(call->rxtx_annotations);
545 kmem_cache_free(rxrpc_call_jar, call);
546}
547
548/*
549 * clean up a call
550 */
551void rxrpc_cleanup_call(struct rxrpc_call *call)
552{
553 int i;
554
555 _net("DESTROY CALL %d", call->debug_id);
556
557 memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
558
559 del_timer_sync(&call->timer);
560
561 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
562 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
563 ASSERTCMP(call->conn, ==, NULL);
564
565 /* Clean up the Rx/Tx buffer */
566 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++)
567 rxrpc_free_skb(call->rxtx_buffer[i],
568 (call->tx_phase ? rxrpc_skb_tx_cleaned :
569 rxrpc_skb_rx_cleaned));
570
571 rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned);
572
573 call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
574}
575
576/*
577 * Make sure that all calls are gone.
578 */
579void __exit rxrpc_destroy_all_calls(void)
580{
581 struct rxrpc_call *call;
582
583 _enter("");
584
585 if (list_empty(&rxrpc_calls))
586 return;
587
588 write_lock(&rxrpc_call_lock);
589
590 while (!list_empty(&rxrpc_calls)) {
591 call = list_entry(rxrpc_calls.next, struct rxrpc_call, link);
592 _debug("Zapping call %p", call);
593
594 rxrpc_see_call(call);
595 list_del_init(&call->link);
596
597 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
598 call, atomic_read(&call->usage),
599 rxrpc_call_states[call->state],
600 call->flags, call->events);
601
602 write_unlock(&rxrpc_call_lock);
603 cond_resched();
604 write_lock(&rxrpc_call_lock);
605 }
606
607 write_unlock(&rxrpc_call_lock);
608}