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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// 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 DEFINE_SEMAPHORE(rxrpc_call_limiter, 1000);
44static DEFINE_SEMAPHORE(rxrpc_kernel_call_limiter, 1000);
45
46void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what)
47{
48 struct rxrpc_local *local = call->local;
49 bool busy;
50
51 if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) {
52 spin_lock_bh(&local->lock);
53 busy = !list_empty(&call->attend_link);
54 trace_rxrpc_poke_call(call, busy, what);
55 if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke))
56 busy = true;
57 if (!busy) {
58 list_add_tail(&call->attend_link, &local->call_attend_q);
59 }
60 spin_unlock_bh(&local->lock);
61 if (!busy)
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);
74 rxrpc_poke_call(call, rxrpc_call_poke_timer);
75 }
76}
77
78static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
79
80static void rxrpc_destroy_call(struct work_struct *);
81
82/*
83 * find an extant server call
84 * - called in process context with IRQs enabled
85 */
86struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
87 unsigned long user_call_ID)
88{
89 struct rxrpc_call *call;
90 struct rb_node *p;
91
92 _enter("%p,%lx", rx, user_call_ID);
93
94 read_lock(&rx->call_lock);
95
96 p = rx->calls.rb_node;
97 while (p) {
98 call = rb_entry(p, struct rxrpc_call, sock_node);
99
100 if (user_call_ID < call->user_call_ID)
101 p = p->rb_left;
102 else if (user_call_ID > call->user_call_ID)
103 p = p->rb_right;
104 else
105 goto found_extant_call;
106 }
107
108 read_unlock(&rx->call_lock);
109 _leave(" = NULL");
110 return NULL;
111
112found_extant_call:
113 rxrpc_get_call(call, rxrpc_call_get_sendmsg);
114 read_unlock(&rx->call_lock);
115 _leave(" = %p [%d]", call, refcount_read(&call->ref));
116 return call;
117}
118
119/*
120 * allocate a new call
121 */
122struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
123 unsigned int debug_id)
124{
125 struct rxrpc_call *call;
126 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
127
128 call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
129 if (!call)
130 return NULL;
131
132 mutex_init(&call->user_mutex);
133
134 /* Prevent lockdep reporting a deadlock false positive between the afs
135 * filesystem and sys_sendmsg() via the mmap sem.
136 */
137 if (rx->sk.sk_kern_sock)
138 lockdep_set_class(&call->user_mutex,
139 &rxrpc_call_user_mutex_lock_class_key);
140
141 timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
142 INIT_WORK(&call->destroyer, rxrpc_destroy_call);
143 INIT_LIST_HEAD(&call->link);
144 INIT_LIST_HEAD(&call->wait_link);
145 INIT_LIST_HEAD(&call->accept_link);
146 INIT_LIST_HEAD(&call->recvmsg_link);
147 INIT_LIST_HEAD(&call->sock_link);
148 INIT_LIST_HEAD(&call->attend_link);
149 INIT_LIST_HEAD(&call->tx_sendmsg);
150 INIT_LIST_HEAD(&call->tx_buffer);
151 skb_queue_head_init(&call->recvmsg_queue);
152 skb_queue_head_init(&call->rx_oos_queue);
153 init_waitqueue_head(&call->waitq);
154 spin_lock_init(&call->notify_lock);
155 spin_lock_init(&call->tx_lock);
156 refcount_set(&call->ref, 1);
157 call->debug_id = debug_id;
158 call->tx_total_len = -1;
159 call->next_rx_timo = 20 * HZ;
160 call->next_req_timo = 1 * HZ;
161 call->ackr_window = 1;
162 call->ackr_wtop = 1;
163 call->delay_ack_at = KTIME_MAX;
164 call->ack_lost_at = KTIME_MAX;
165 call->resend_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 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 */
189static 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 = min(p->timeouts.normal, 1);
224 if (p->timeouts.idle)
225 call->next_req_timo = min(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 */
248void 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 */
262static 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 */
278static 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 */
292static 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(&local->client_call_lock);
306 list_add_tail(&call->wait_link, &local->new_client_calls);
307 spin_unlock(&local->client_call_lock);
308 rxrpc_wake_up_io_thread(local);
309 return 0;
310
311error:
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 */
321struct 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.slock)
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 */
411error_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 */
427error_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 in BH context and isn't allowed to fail.
438 */
439void 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_SECURING);
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 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
464 break;
465 case RXRPC_CONN_SERVICE:
466 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
467 break;
468
469 case RXRPC_CONN_ABORTED:
470 rxrpc_set_call_completion(call, conn->completion,
471 conn->abort_code, conn->error);
472 break;
473 default:
474 BUG();
475 }
476
477 rxrpc_get_call(call, rxrpc_call_get_io_thread);
478
479 /* Set the channel for this call. We don't get channel_lock as we're
480 * only defending against the data_ready handler (which we're called
481 * from) and the RESPONSE packet parser (which is only really
482 * interested in call_counter and can cope with a disagreement with the
483 * call pointer).
484 */
485 chan = sp->hdr.cid & RXRPC_CHANNELMASK;
486 conn->channels[chan].call_counter = call->call_id;
487 conn->channels[chan].call_id = call->call_id;
488 conn->channels[chan].call = call;
489 spin_unlock(&conn->state_lock);
490
491 spin_lock(&conn->peer->lock);
492 hlist_add_head(&call->error_link, &conn->peer->error_targets);
493 spin_unlock(&conn->peer->lock);
494
495 rxrpc_start_call_timer(call);
496 _leave("");
497}
498
499/*
500 * Note the re-emergence of a call.
501 */
502void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
503{
504 if (call) {
505 int r = refcount_read(&call->ref);
506
507 trace_rxrpc_call(call->debug_id, r, 0, why);
508 }
509}
510
511struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
512 enum rxrpc_call_trace why)
513{
514 int r;
515
516 if (!call || !__refcount_inc_not_zero(&call->ref, &r))
517 return NULL;
518 trace_rxrpc_call(call->debug_id, r + 1, 0, why);
519 return call;
520}
521
522/*
523 * Note the addition of a ref on a call.
524 */
525void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
526{
527 int r;
528
529 __refcount_inc(&call->ref, &r);
530 trace_rxrpc_call(call->debug_id, r + 1, 0, why);
531}
532
533/*
534 * Clean up the Rx skb ring.
535 */
536static void rxrpc_cleanup_ring(struct rxrpc_call *call)
537{
538 rxrpc_purge_queue(&call->recvmsg_queue);
539 rxrpc_purge_queue(&call->rx_oos_queue);
540}
541
542/*
543 * Detach a call from its owning socket.
544 */
545void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
546{
547 struct rxrpc_connection *conn = call->conn;
548 bool put = false, putu = false;
549
550 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
551
552 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
553 call->flags, rxrpc_call_see_release);
554
555 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
556 BUG();
557
558 rxrpc_put_call_slot(call);
559
560 /* Make sure we don't get any more notifications */
561 spin_lock(&rx->recvmsg_lock);
562
563 if (!list_empty(&call->recvmsg_link)) {
564 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
565 call, call->events, call->flags);
566 list_del(&call->recvmsg_link);
567 put = true;
568 }
569
570 /* list_empty() must return false in rxrpc_notify_socket() */
571 call->recvmsg_link.next = NULL;
572 call->recvmsg_link.prev = NULL;
573
574 spin_unlock(&rx->recvmsg_lock);
575 if (put)
576 rxrpc_put_call(call, rxrpc_call_put_unnotify);
577
578 write_lock(&rx->call_lock);
579
580 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
581 rb_erase(&call->sock_node, &rx->calls);
582 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
583 putu = true;
584 }
585
586 list_del(&call->sock_link);
587 write_unlock(&rx->call_lock);
588
589 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
590
591 if (putu)
592 rxrpc_put_call(call, rxrpc_call_put_userid);
593
594 _leave("");
595}
596
597/*
598 * release all the calls associated with a socket
599 */
600void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
601{
602 struct rxrpc_call *call;
603
604 _enter("%p", rx);
605
606 while (!list_empty(&rx->to_be_accepted)) {
607 call = list_entry(rx->to_be_accepted.next,
608 struct rxrpc_call, accept_link);
609 list_del(&call->accept_link);
610 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
611 rxrpc_abort_call_sock_release_tba);
612 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
613 }
614
615 while (!list_empty(&rx->sock_calls)) {
616 call = list_entry(rx->sock_calls.next,
617 struct rxrpc_call, sock_link);
618 rxrpc_get_call(call, rxrpc_call_get_release_sock);
619 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
620 rxrpc_abort_call_sock_release);
621 rxrpc_release_call(rx, call);
622 rxrpc_put_call(call, rxrpc_call_put_release_sock);
623 }
624
625 _leave("");
626}
627
628/*
629 * release a call
630 */
631void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
632{
633 struct rxrpc_net *rxnet = call->rxnet;
634 unsigned int debug_id = call->debug_id;
635 bool dead;
636 int r;
637
638 ASSERT(call != NULL);
639
640 dead = __refcount_dec_and_test(&call->ref, &r);
641 trace_rxrpc_call(debug_id, r - 1, 0, why);
642 if (dead) {
643 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
644
645 if (!list_empty(&call->link)) {
646 spin_lock(&rxnet->call_lock);
647 list_del_init(&call->link);
648 spin_unlock(&rxnet->call_lock);
649 }
650
651 rxrpc_cleanup_call(call);
652 }
653}
654
655/*
656 * Free up the call under RCU.
657 */
658static void rxrpc_rcu_free_call(struct rcu_head *rcu)
659{
660 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
661 struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
662
663 kmem_cache_free(rxrpc_call_jar, call);
664 if (atomic_dec_and_test(&rxnet->nr_calls))
665 wake_up_var(&rxnet->nr_calls);
666}
667
668/*
669 * Final call destruction - but must be done in process context.
670 */
671static void rxrpc_destroy_call(struct work_struct *work)
672{
673 struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
674 struct rxrpc_txbuf *txb;
675
676 del_timer_sync(&call->timer);
677
678 rxrpc_free_skb(call->cong_last_nack, rxrpc_skb_put_last_nack);
679 rxrpc_cleanup_ring(call);
680 while ((txb = list_first_entry_or_null(&call->tx_sendmsg,
681 struct rxrpc_txbuf, call_link))) {
682 list_del(&txb->call_link);
683 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
684 }
685 while ((txb = list_first_entry_or_null(&call->tx_buffer,
686 struct rxrpc_txbuf, call_link))) {
687 list_del(&txb->call_link);
688 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
689 }
690
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 call_rcu(&call->rcu, rxrpc_rcu_free_call);
698}
699
700/*
701 * clean up a call
702 */
703void rxrpc_cleanup_call(struct rxrpc_call *call)
704{
705 memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
706
707 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
708 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
709
710 del_timer(&call->timer);
711
712 if (rcu_read_lock_held())
713 /* Can't use the rxrpc workqueue as we need to cancel/flush
714 * something that may be running/waiting there.
715 */
716 schedule_work(&call->destroyer);
717 else
718 rxrpc_destroy_call(&call->destroyer);
719}
720
721/*
722 * Make sure that all calls are gone from a network namespace. To reach this
723 * point, any open UDP sockets in that namespace must have been closed, so any
724 * outstanding calls cannot be doing I/O.
725 */
726void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
727{
728 struct rxrpc_call *call;
729
730 _enter("");
731
732 if (!list_empty(&rxnet->calls)) {
733 spin_lock(&rxnet->call_lock);
734
735 while (!list_empty(&rxnet->calls)) {
736 call = list_entry(rxnet->calls.next,
737 struct rxrpc_call, link);
738 _debug("Zapping call %p", call);
739
740 rxrpc_see_call(call, rxrpc_call_see_zap);
741 list_del_init(&call->link);
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 spin_unlock(&rxnet->call_lock);
749 cond_resched();
750 spin_lock(&rxnet->call_lock);
751 }
752
753 spin_unlock(&rxnet->call_lock);
754 }
755
756 atomic_dec(&rxnet->nr_calls);
757 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
758}