1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* RxRPC individual remote procedure call handling
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/slab.h>
11 #include <linux/module.h>
12 #include <linux/circ_buf.h>
13 #include <linux/spinlock_types.h>
14 #include <net/sock.h>
15 #include <net/af_rxrpc.h>
16 #include "ar-internal.h"
17
18 const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
19 [RXRPC_CALL_UNINITIALISED] = "Uninit ",
20 [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn",
21 [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
22 [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
23 [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
24 [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc",
25 [RXRPC_CALL_SERVER_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
33 const 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
41 struct kmem_cache *rxrpc_call_jar;
42
43 static DEFINE_SEMAPHORE(rxrpc_call_limiter, 1000);
44 static DEFINE_SEMAPHORE(rxrpc_kernel_call_limiter, 1000);
45
rxrpc_poke_call(struct rxrpc_call * call,enum rxrpc_call_poke_trace what)46 void 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
rxrpc_call_timer_expired(struct timer_list * t)66 static 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
rxrpc_reduce_call_timer(struct rxrpc_call * call,unsigned long expire_at,unsigned long now,enum rxrpc_timer_trace why)78 void 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
87 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
88
89 static void rxrpc_destroy_call(struct work_struct *);
90
91 /*
92 * find an extant server call
93 * - called in process context with IRQs enabled
94 */
rxrpc_find_call_by_user_ID(struct rxrpc_sock * rx,unsigned long user_call_ID)95 struct 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
121 found_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 */
rxrpc_alloc_call(struct rxrpc_sock * rx,gfp_t gfp,unsigned int debug_id)131 struct 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 call->ackr_window = 1;
171 call->ackr_wtop = 1;
172
173 memset(&call->sock_node, 0xed, sizeof(call->sock_node));
174
175 call->rx_winsize = rxrpc_rx_window_size;
176 call->tx_winsize = 16;
177
178 call->cong_cwnd = RXRPC_MIN_CWND;
179 call->cong_ssthresh = RXRPC_TX_MAX_WINDOW;
180
181 call->rxnet = rxnet;
182 call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
183 atomic_inc(&rxnet->nr_calls);
184 return call;
185 }
186
187 /*
188 * Allocate a new client call.
189 */
rxrpc_alloc_client_call(struct rxrpc_sock * rx,struct sockaddr_rxrpc * srx,struct rxrpc_conn_parameters * cp,struct rxrpc_call_params * p,gfp_t gfp,unsigned int debug_id)190 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
191 struct sockaddr_rxrpc *srx,
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 = *srx;
210 call->interruptibility = p->interruptibility;
211 call->tx_total_len = p->tx_total_len;
212 call->key = key_get(cp->key);
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(msecs_to_jiffies(p->timeouts.normal), 1UL);
224 if (p->timeouts.idle)
225 call->next_req_timo = min(msecs_to_jiffies(p->timeouts.idle), 1UL);
226 if (p->timeouts.hard)
227 call->hard_timo = p->timeouts.hard * HZ;
228
229 ret = rxrpc_init_client_call_security(call);
230 if (ret < 0) {
231 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret);
232 rxrpc_put_call(call, rxrpc_call_put_discard_error);
233 return ERR_PTR(ret);
234 }
235
236 rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN);
237
238 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
239 p->user_call_ID, rxrpc_call_new_client);
240
241 _leave(" = %p", call);
242 return call;
243 }
244
245 /*
246 * Initiate the call ack/resend/expiry timer.
247 */
rxrpc_start_call_timer(struct rxrpc_call * call)248 void rxrpc_start_call_timer(struct rxrpc_call *call)
249 {
250 unsigned long now = jiffies;
251 unsigned long j = now + MAX_JIFFY_OFFSET;
252
253 call->delay_ack_at = j;
254 call->ack_lost_at = j;
255 call->resend_at = j;
256 call->ping_at = j;
257 call->keepalive_at = j;
258 call->expect_rx_by = j;
259 call->expect_req_by = j;
260 call->expect_term_by = j + call->hard_timo;
261 call->timer.expires = now;
262 }
263
264 /*
265 * Wait for a call slot to become available.
266 */
rxrpc_get_call_slot(struct rxrpc_call_params * p,gfp_t gfp)267 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
268 {
269 struct semaphore *limiter = &rxrpc_call_limiter;
270
271 if (p->kernel)
272 limiter = &rxrpc_kernel_call_limiter;
273 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
274 down(limiter);
275 return limiter;
276 }
277 return down_interruptible(limiter) < 0 ? NULL : limiter;
278 }
279
280 /*
281 * Release a call slot.
282 */
rxrpc_put_call_slot(struct rxrpc_call * call)283 static void rxrpc_put_call_slot(struct rxrpc_call *call)
284 {
285 struct semaphore *limiter = &rxrpc_call_limiter;
286
287 if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
288 limiter = &rxrpc_kernel_call_limiter;
289 up(limiter);
290 }
291
292 /*
293 * Start the process of connecting a call. We obtain a peer and a connection
294 * bundle, but the actual association of a call with a connection is offloaded
295 * to the I/O thread to simplify locking.
296 */
rxrpc_connect_call(struct rxrpc_call * call,gfp_t gfp)297 static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
298 {
299 struct rxrpc_local *local = call->local;
300 int ret = -ENOMEM;
301
302 _enter("{%d,%lx},", call->debug_id, call->user_call_ID);
303
304 call->peer = rxrpc_lookup_peer(local, &call->dest_srx, gfp);
305 if (!call->peer)
306 goto error;
307
308 ret = rxrpc_look_up_bundle(call, gfp);
309 if (ret < 0)
310 goto error;
311
312 trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call);
313 rxrpc_get_call(call, rxrpc_call_get_io_thread);
314 spin_lock(&local->client_call_lock);
315 list_add_tail(&call->wait_link, &local->new_client_calls);
316 spin_unlock(&local->client_call_lock);
317 rxrpc_wake_up_io_thread(local);
318 return 0;
319
320 error:
321 __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
322 return ret;
323 }
324
325 /*
326 * Set up a call for the given parameters.
327 * - Called with the socket lock held, which it must release.
328 * - If it returns a call, the call's lock will need releasing by the caller.
329 */
rxrpc_new_client_call(struct rxrpc_sock * rx,struct rxrpc_conn_parameters * cp,struct sockaddr_rxrpc * srx,struct rxrpc_call_params * p,gfp_t gfp,unsigned int debug_id)330 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
331 struct rxrpc_conn_parameters *cp,
332 struct sockaddr_rxrpc *srx,
333 struct rxrpc_call_params *p,
334 gfp_t gfp,
335 unsigned int debug_id)
336 __releases(&rx->sk.sk_lock.slock)
337 __acquires(&call->user_mutex)
338 {
339 struct rxrpc_call *call, *xcall;
340 struct rxrpc_net *rxnet;
341 struct semaphore *limiter;
342 struct rb_node *parent, **pp;
343 int ret;
344
345 _enter("%p,%lx", rx, p->user_call_ID);
346
347 limiter = rxrpc_get_call_slot(p, gfp);
348 if (!limiter) {
349 release_sock(&rx->sk);
350 return ERR_PTR(-ERESTARTSYS);
351 }
352
353 call = rxrpc_alloc_client_call(rx, srx, cp, p, gfp, debug_id);
354 if (IS_ERR(call)) {
355 release_sock(&rx->sk);
356 up(limiter);
357 _leave(" = %ld", PTR_ERR(call));
358 return call;
359 }
360
361 /* We need to protect a partially set up call against the user as we
362 * will be acting outside the socket lock.
363 */
364 mutex_lock(&call->user_mutex);
365
366 /* Publish the call, even though it is incompletely set up as yet */
367 write_lock(&rx->call_lock);
368
369 pp = &rx->calls.rb_node;
370 parent = NULL;
371 while (*pp) {
372 parent = *pp;
373 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
374
375 if (p->user_call_ID < xcall->user_call_ID)
376 pp = &(*pp)->rb_left;
377 else if (p->user_call_ID > xcall->user_call_ID)
378 pp = &(*pp)->rb_right;
379 else
380 goto error_dup_user_ID;
381 }
382
383 rcu_assign_pointer(call->socket, rx);
384 call->user_call_ID = p->user_call_ID;
385 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
386 rxrpc_get_call(call, rxrpc_call_get_userid);
387 rb_link_node(&call->sock_node, parent, pp);
388 rb_insert_color(&call->sock_node, &rx->calls);
389 list_add(&call->sock_link, &rx->sock_calls);
390
391 write_unlock(&rx->call_lock);
392
393 rxnet = call->rxnet;
394 spin_lock(&rxnet->call_lock);
395 list_add_tail_rcu(&call->link, &rxnet->calls);
396 spin_unlock(&rxnet->call_lock);
397
398 /* From this point on, the call is protected by its own lock. */
399 release_sock(&rx->sk);
400
401 /* Set up or get a connection record and set the protocol parameters,
402 * including channel number and call ID.
403 */
404 ret = rxrpc_connect_call(call, gfp);
405 if (ret < 0)
406 goto error_attached_to_socket;
407
408 _leave(" = %p [new]", call);
409 return call;
410
411 /* We unexpectedly found the user ID in the list after taking
412 * the call_lock. This shouldn't happen unless the user races
413 * with itself and tries to add the same user ID twice at the
414 * same time in different threads.
415 */
416 error_dup_user_ID:
417 write_unlock(&rx->call_lock);
418 release_sock(&rx->sk);
419 rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST);
420 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0,
421 rxrpc_call_see_userid_exists);
422 mutex_unlock(&call->user_mutex);
423 rxrpc_put_call(call, rxrpc_call_put_userid_exists);
424 _leave(" = -EEXIST");
425 return ERR_PTR(-EEXIST);
426
427 /* We got an error, but the call is attached to the socket and is in
428 * need of release. However, we might now race with recvmsg() when it
429 * completion notifies the socket. Return 0 from sys_sendmsg() and
430 * leave the error to recvmsg() to deal with.
431 */
432 error_attached_to_socket:
433 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret,
434 rxrpc_call_see_connect_failed);
435 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);
436 _leave(" = c=%08x [err]", call->debug_id);
437 return call;
438 }
439
440 /*
441 * Set up an incoming call. call->conn points to the connection.
442 * This is called in BH context and isn't allowed to fail.
443 */
rxrpc_incoming_call(struct rxrpc_sock * rx,struct rxrpc_call * call,struct sk_buff * skb)444 void rxrpc_incoming_call(struct rxrpc_sock *rx,
445 struct rxrpc_call *call,
446 struct sk_buff *skb)
447 {
448 struct rxrpc_connection *conn = call->conn;
449 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
450 u32 chan;
451
452 _enter(",%d", call->conn->debug_id);
453
454 rcu_assign_pointer(call->socket, rx);
455 call->call_id = sp->hdr.callNumber;
456 call->dest_srx.srx_service = sp->hdr.serviceId;
457 call->cid = sp->hdr.cid;
458 call->cong_tstamp = skb->tstamp;
459
460 __set_bit(RXRPC_CALL_EXPOSED, &call->flags);
461 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
462
463 spin_lock(&conn->state_lock);
464
465 switch (conn->state) {
466 case RXRPC_CONN_SERVICE_UNSECURED:
467 case RXRPC_CONN_SERVICE_CHALLENGING:
468 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING);
469 break;
470 case RXRPC_CONN_SERVICE:
471 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
472 break;
473
474 case RXRPC_CONN_ABORTED:
475 rxrpc_set_call_completion(call, conn->completion,
476 conn->abort_code, conn->error);
477 break;
478 default:
479 BUG();
480 }
481
482 rxrpc_get_call(call, rxrpc_call_get_io_thread);
483
484 /* Set the channel for this call. We don't get channel_lock as we're
485 * only defending against the data_ready handler (which we're called
486 * from) and the RESPONSE packet parser (which is only really
487 * interested in call_counter and can cope with a disagreement with the
488 * call pointer).
489 */
490 chan = sp->hdr.cid & RXRPC_CHANNELMASK;
491 conn->channels[chan].call_counter = call->call_id;
492 conn->channels[chan].call_id = call->call_id;
493 conn->channels[chan].call = call;
494 spin_unlock(&conn->state_lock);
495
496 spin_lock(&conn->peer->lock);
497 hlist_add_head(&call->error_link, &conn->peer->error_targets);
498 spin_unlock(&conn->peer->lock);
499
500 rxrpc_start_call_timer(call);
501 _leave("");
502 }
503
504 /*
505 * Note the re-emergence of a call.
506 */
rxrpc_see_call(struct rxrpc_call * call,enum rxrpc_call_trace why)507 void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
508 {
509 if (call) {
510 int r = refcount_read(&call->ref);
511
512 trace_rxrpc_call(call->debug_id, r, 0, why);
513 }
514 }
515
rxrpc_try_get_call(struct rxrpc_call * call,enum rxrpc_call_trace why)516 struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call,
517 enum rxrpc_call_trace why)
518 {
519 int r;
520
521 if (!call || !__refcount_inc_not_zero(&call->ref, &r))
522 return NULL;
523 trace_rxrpc_call(call->debug_id, r + 1, 0, why);
524 return call;
525 }
526
527 /*
528 * Note the addition of a ref on a call.
529 */
rxrpc_get_call(struct rxrpc_call * call,enum rxrpc_call_trace why)530 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
531 {
532 int r;
533
534 __refcount_inc(&call->ref, &r);
535 trace_rxrpc_call(call->debug_id, r + 1, 0, why);
536 }
537
538 /*
539 * Clean up the Rx skb ring.
540 */
rxrpc_cleanup_ring(struct rxrpc_call * call)541 static void rxrpc_cleanup_ring(struct rxrpc_call *call)
542 {
543 rxrpc_purge_queue(&call->recvmsg_queue);
544 rxrpc_purge_queue(&call->rx_oos_queue);
545 }
546
547 /*
548 * Detach a call from its owning socket.
549 */
rxrpc_release_call(struct rxrpc_sock * rx,struct rxrpc_call * call)550 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
551 {
552 struct rxrpc_connection *conn = call->conn;
553 bool put = false, putu = false;
554
555 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
556
557 trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
558 call->flags, rxrpc_call_see_release);
559
560 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
561 BUG();
562
563 rxrpc_put_call_slot(call);
564
565 /* Make sure we don't get any more notifications */
566 spin_lock(&rx->recvmsg_lock);
567
568 if (!list_empty(&call->recvmsg_link)) {
569 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
570 call, call->events, call->flags);
571 list_del(&call->recvmsg_link);
572 put = true;
573 }
574
575 /* list_empty() must return false in rxrpc_notify_socket() */
576 call->recvmsg_link.next = NULL;
577 call->recvmsg_link.prev = NULL;
578
579 spin_unlock(&rx->recvmsg_lock);
580 if (put)
581 rxrpc_put_call(call, rxrpc_call_put_unnotify);
582
583 write_lock(&rx->call_lock);
584
585 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
586 rb_erase(&call->sock_node, &rx->calls);
587 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
588 putu = true;
589 }
590
591 list_del(&call->sock_link);
592 write_unlock(&rx->call_lock);
593
594 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
595
596 if (putu)
597 rxrpc_put_call(call, rxrpc_call_put_userid);
598
599 _leave("");
600 }
601
602 /*
603 * release all the calls associated with a socket
604 */
rxrpc_release_calls_on_socket(struct rxrpc_sock * rx)605 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
606 {
607 struct rxrpc_call *call;
608
609 _enter("%p", rx);
610
611 while (!list_empty(&rx->to_be_accepted)) {
612 call = list_entry(rx->to_be_accepted.next,
613 struct rxrpc_call, accept_link);
614 list_del(&call->accept_link);
615 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
616 rxrpc_abort_call_sock_release_tba);
617 rxrpc_put_call(call, rxrpc_call_put_release_sock_tba);
618 }
619
620 while (!list_empty(&rx->sock_calls)) {
621 call = list_entry(rx->sock_calls.next,
622 struct rxrpc_call, sock_link);
623 rxrpc_get_call(call, rxrpc_call_get_release_sock);
624 rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET,
625 rxrpc_abort_call_sock_release);
626 rxrpc_release_call(rx, call);
627 rxrpc_put_call(call, rxrpc_call_put_release_sock);
628 }
629
630 _leave("");
631 }
632
633 /*
634 * release a call
635 */
rxrpc_put_call(struct rxrpc_call * call,enum rxrpc_call_trace why)636 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why)
637 {
638 struct rxrpc_net *rxnet = call->rxnet;
639 unsigned int debug_id = call->debug_id;
640 bool dead;
641 int r;
642
643 ASSERT(call != NULL);
644
645 dead = __refcount_dec_and_test(&call->ref, &r);
646 trace_rxrpc_call(debug_id, r - 1, 0, why);
647 if (dead) {
648 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
649
650 if (!list_empty(&call->link)) {
651 spin_lock(&rxnet->call_lock);
652 list_del_init(&call->link);
653 spin_unlock(&rxnet->call_lock);
654 }
655
656 rxrpc_cleanup_call(call);
657 }
658 }
659
660 /*
661 * Free up the call under RCU.
662 */
rxrpc_rcu_free_call(struct rcu_head * rcu)663 static void rxrpc_rcu_free_call(struct rcu_head *rcu)
664 {
665 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
666 struct rxrpc_net *rxnet = READ_ONCE(call->rxnet);
667
668 kmem_cache_free(rxrpc_call_jar, call);
669 if (atomic_dec_and_test(&rxnet->nr_calls))
670 wake_up_var(&rxnet->nr_calls);
671 }
672
673 /*
674 * Final call destruction - but must be done in process context.
675 */
rxrpc_destroy_call(struct work_struct * work)676 static void rxrpc_destroy_call(struct work_struct *work)
677 {
678 struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer);
679 struct rxrpc_txbuf *txb;
680
681 del_timer_sync(&call->timer);
682
683 rxrpc_free_skb(call->cong_last_nack, rxrpc_skb_put_last_nack);
684 rxrpc_cleanup_ring(call);
685 while ((txb = list_first_entry_or_null(&call->tx_sendmsg,
686 struct rxrpc_txbuf, call_link))) {
687 list_del(&txb->call_link);
688 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
689 }
690 while ((txb = list_first_entry_or_null(&call->tx_buffer,
691 struct rxrpc_txbuf, call_link))) {
692 list_del(&txb->call_link);
693 rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned);
694 }
695
696 rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned);
697 rxrpc_put_connection(call->conn, rxrpc_conn_put_call);
698 rxrpc_deactivate_bundle(call->bundle);
699 rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call);
700 rxrpc_put_peer(call->peer, rxrpc_peer_put_call);
701 rxrpc_put_local(call->local, rxrpc_local_put_call);
702 call_rcu(&call->rcu, rxrpc_rcu_free_call);
703 }
704
705 /*
706 * clean up a call
707 */
rxrpc_cleanup_call(struct rxrpc_call * call)708 void rxrpc_cleanup_call(struct rxrpc_call *call)
709 {
710 memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
711
712 ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE);
713 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
714
715 del_timer(&call->timer);
716
717 if (rcu_read_lock_held())
718 /* Can't use the rxrpc workqueue as we need to cancel/flush
719 * something that may be running/waiting there.
720 */
721 schedule_work(&call->destroyer);
722 else
723 rxrpc_destroy_call(&call->destroyer);
724 }
725
726 /*
727 * Make sure that all calls are gone from a network namespace. To reach this
728 * point, any open UDP sockets in that namespace must have been closed, so any
729 * outstanding calls cannot be doing I/O.
730 */
rxrpc_destroy_all_calls(struct rxrpc_net * rxnet)731 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
732 {
733 struct rxrpc_call *call;
734
735 _enter("");
736
737 if (!list_empty(&rxnet->calls)) {
738 spin_lock(&rxnet->call_lock);
739
740 while (!list_empty(&rxnet->calls)) {
741 call = list_entry(rxnet->calls.next,
742 struct rxrpc_call, link);
743 _debug("Zapping call %p", call);
744
745 rxrpc_see_call(call, rxrpc_call_see_zap);
746 list_del_init(&call->link);
747
748 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
749 call, refcount_read(&call->ref),
750 rxrpc_call_states[__rxrpc_call_state(call)],
751 call->flags, call->events);
752
753 spin_unlock(&rxnet->call_lock);
754 cond_resched();
755 spin_lock(&rxnet->call_lock);
756 }
757
758 spin_unlock(&rxnet->call_lock);
759 }
760
761 atomic_dec(&rxnet->nr_calls);
762 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
763 }
764