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 struct semaphore rxrpc_call_limiter =
44 __SEMAPHORE_INITIALIZER(rxrpc_call_limiter, 1000);
45 static struct semaphore rxrpc_kernel_call_limiter =
46 __SEMAPHORE_INITIALIZER(rxrpc_kernel_call_limiter, 1000);
47
rxrpc_call_timer_expired(struct timer_list * t)48 static void rxrpc_call_timer_expired(struct timer_list *t)
49 {
50 struct rxrpc_call *call = from_timer(call, t, timer);
51
52 _enter("%d", call->debug_id);
53
54 if (call->state < RXRPC_CALL_COMPLETE) {
55 trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies);
56 __rxrpc_queue_call(call);
57 } else {
58 rxrpc_put_call(call, rxrpc_call_put);
59 }
60 }
61
rxrpc_reduce_call_timer(struct rxrpc_call * call,unsigned long expire_at,unsigned long now,enum rxrpc_timer_trace why)62 void rxrpc_reduce_call_timer(struct rxrpc_call *call,
63 unsigned long expire_at,
64 unsigned long now,
65 enum rxrpc_timer_trace why)
66 {
67 if (rxrpc_try_get_call(call, rxrpc_call_got_timer)) {
68 trace_rxrpc_timer(call, why, now);
69 if (timer_reduce(&call->timer, expire_at))
70 rxrpc_put_call(call, rxrpc_call_put_notimer);
71 }
72 }
73
rxrpc_delete_call_timer(struct rxrpc_call * call)74 void rxrpc_delete_call_timer(struct rxrpc_call *call)
75 {
76 if (del_timer_sync(&call->timer))
77 rxrpc_put_call(call, rxrpc_call_put_timer);
78 }
79
80 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
81
82 /*
83 * find an extant server call
84 * - called in process context with IRQs enabled
85 */
rxrpc_find_call_by_user_ID(struct rxrpc_sock * rx,unsigned long user_call_ID)86 struct 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
112 found_extant_call:
113 rxrpc_get_call(call, rxrpc_call_got);
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 */
rxrpc_alloc_call(struct rxrpc_sock * rx,gfp_t gfp,unsigned int debug_id)122 struct 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 call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
133 sizeof(struct sk_buff *),
134 gfp);
135 if (!call->rxtx_buffer)
136 goto nomem;
137
138 call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
139 if (!call->rxtx_annotations)
140 goto nomem_2;
141
142 mutex_init(&call->user_mutex);
143
144 /* Prevent lockdep reporting a deadlock false positive between the afs
145 * filesystem and sys_sendmsg() via the mmap sem.
146 */
147 if (rx->sk.sk_kern_sock)
148 lockdep_set_class(&call->user_mutex,
149 &rxrpc_call_user_mutex_lock_class_key);
150
151 timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
152 INIT_WORK(&call->processor, &rxrpc_process_call);
153 INIT_LIST_HEAD(&call->link);
154 INIT_LIST_HEAD(&call->chan_wait_link);
155 INIT_LIST_HEAD(&call->accept_link);
156 INIT_LIST_HEAD(&call->recvmsg_link);
157 INIT_LIST_HEAD(&call->sock_link);
158 init_waitqueue_head(&call->waitq);
159 spin_lock_init(&call->lock);
160 spin_lock_init(&call->notify_lock);
161 spin_lock_init(&call->input_lock);
162 rwlock_init(&call->state_lock);
163 refcount_set(&call->ref, 1);
164 call->debug_id = debug_id;
165 call->tx_total_len = -1;
166 call->next_rx_timo = 20 * HZ;
167 call->next_req_timo = 1 * HZ;
168
169 memset(&call->sock_node, 0xed, sizeof(call->sock_node));
170
171 /* Leave space in the ring to handle a maxed-out jumbo packet */
172 call->rx_winsize = rxrpc_rx_window_size;
173 call->tx_winsize = 16;
174 call->rx_expect_next = 1;
175
176 call->cong_cwnd = 2;
177 call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1;
178
179 call->rxnet = rxnet;
180 call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK;
181 atomic_inc(&rxnet->nr_calls);
182 return call;
183
184 nomem_2:
185 kfree(call->rxtx_buffer);
186 nomem:
187 kmem_cache_free(rxrpc_call_jar, call);
188 return NULL;
189 }
190
191 /*
192 * Allocate a new client call.
193 */
rxrpc_alloc_client_call(struct rxrpc_sock * rx,struct sockaddr_rxrpc * srx,gfp_t gfp,unsigned int debug_id)194 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
195 struct sockaddr_rxrpc *srx,
196 gfp_t gfp,
197 unsigned int debug_id)
198 {
199 struct rxrpc_call *call;
200 ktime_t now;
201
202 _enter("");
203
204 call = rxrpc_alloc_call(rx, gfp, debug_id);
205 if (!call)
206 return ERR_PTR(-ENOMEM);
207 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
208 call->service_id = srx->srx_service;
209 call->tx_phase = true;
210 now = ktime_get_real();
211 call->acks_latest_ts = now;
212 call->cong_tstamp = now;
213
214 _leave(" = %p", call);
215 return call;
216 }
217
218 /*
219 * Initiate the call ack/resend/expiry timer.
220 */
rxrpc_start_call_timer(struct rxrpc_call * call)221 static void rxrpc_start_call_timer(struct rxrpc_call *call)
222 {
223 unsigned long now = jiffies;
224 unsigned long j = now + MAX_JIFFY_OFFSET;
225
226 call->ack_at = j;
227 call->ack_lost_at = j;
228 call->resend_at = j;
229 call->ping_at = j;
230 call->expect_rx_by = j;
231 call->expect_req_by = j;
232 call->expect_term_by = j;
233 call->timer.expires = now;
234 }
235
236 /*
237 * Wait for a call slot to become available.
238 */
rxrpc_get_call_slot(struct rxrpc_call_params * p,gfp_t gfp)239 static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp)
240 {
241 struct semaphore *limiter = &rxrpc_call_limiter;
242
243 if (p->kernel)
244 limiter = &rxrpc_kernel_call_limiter;
245 if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) {
246 down(limiter);
247 return limiter;
248 }
249 return down_interruptible(limiter) < 0 ? NULL : limiter;
250 }
251
252 /*
253 * Release a call slot.
254 */
rxrpc_put_call_slot(struct rxrpc_call * call)255 static void rxrpc_put_call_slot(struct rxrpc_call *call)
256 {
257 struct semaphore *limiter = &rxrpc_call_limiter;
258
259 if (test_bit(RXRPC_CALL_KERNEL, &call->flags))
260 limiter = &rxrpc_kernel_call_limiter;
261 up(limiter);
262 }
263
264 /*
265 * Set up a call for the given parameters.
266 * - Called with the socket lock held, which it must release.
267 * - If it returns a call, the call's lock will need releasing by the caller.
268 */
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)269 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
270 struct rxrpc_conn_parameters *cp,
271 struct sockaddr_rxrpc *srx,
272 struct rxrpc_call_params *p,
273 gfp_t gfp,
274 unsigned int debug_id)
275 __releases(&rx->sk.sk_lock.slock)
276 __acquires(&call->user_mutex)
277 {
278 struct rxrpc_call *call, *xcall;
279 struct rxrpc_net *rxnet;
280 struct semaphore *limiter;
281 struct rb_node *parent, **pp;
282 const void *here = __builtin_return_address(0);
283 int ret;
284
285 _enter("%p,%lx", rx, p->user_call_ID);
286
287 limiter = rxrpc_get_call_slot(p, gfp);
288 if (!limiter) {
289 release_sock(&rx->sk);
290 return ERR_PTR(-ERESTARTSYS);
291 }
292
293 call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id);
294 if (IS_ERR(call)) {
295 release_sock(&rx->sk);
296 up(limiter);
297 _leave(" = %ld", PTR_ERR(call));
298 return call;
299 }
300
301 call->interruptibility = p->interruptibility;
302 call->tx_total_len = p->tx_total_len;
303 trace_rxrpc_call(call->debug_id, rxrpc_call_new_client,
304 refcount_read(&call->ref),
305 here, (const void *)p->user_call_ID);
306 if (p->kernel)
307 __set_bit(RXRPC_CALL_KERNEL, &call->flags);
308
309 /* We need to protect a partially set up call against the user as we
310 * will be acting outside the socket lock.
311 */
312 mutex_lock(&call->user_mutex);
313
314 /* Publish the call, even though it is incompletely set up as yet */
315 write_lock(&rx->call_lock);
316
317 pp = &rx->calls.rb_node;
318 parent = NULL;
319 while (*pp) {
320 parent = *pp;
321 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
322
323 if (p->user_call_ID < xcall->user_call_ID)
324 pp = &(*pp)->rb_left;
325 else if (p->user_call_ID > xcall->user_call_ID)
326 pp = &(*pp)->rb_right;
327 else
328 goto error_dup_user_ID;
329 }
330
331 rcu_assign_pointer(call->socket, rx);
332 call->user_call_ID = p->user_call_ID;
333 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
334 rxrpc_get_call(call, rxrpc_call_got_userid);
335 rb_link_node(&call->sock_node, parent, pp);
336 rb_insert_color(&call->sock_node, &rx->calls);
337 list_add(&call->sock_link, &rx->sock_calls);
338
339 write_unlock(&rx->call_lock);
340
341 rxnet = call->rxnet;
342 spin_lock_bh(&rxnet->call_lock);
343 list_add_tail_rcu(&call->link, &rxnet->calls);
344 spin_unlock_bh(&rxnet->call_lock);
345
346 /* From this point on, the call is protected by its own lock. */
347 release_sock(&rx->sk);
348
349 /* Set up or get a connection record and set the protocol parameters,
350 * including channel number and call ID.
351 */
352 ret = rxrpc_connect_call(rx, call, cp, srx, gfp);
353 if (ret < 0)
354 goto error_attached_to_socket;
355
356 trace_rxrpc_call(call->debug_id, rxrpc_call_connected,
357 refcount_read(&call->ref), here, NULL);
358
359 rxrpc_start_call_timer(call);
360
361 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
362
363 _leave(" = %p [new]", call);
364 return call;
365
366 /* We unexpectedly found the user ID in the list after taking
367 * the call_lock. This shouldn't happen unless the user races
368 * with itself and tries to add the same user ID twice at the
369 * same time in different threads.
370 */
371 error_dup_user_ID:
372 write_unlock(&rx->call_lock);
373 release_sock(&rx->sk);
374 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
375 RX_CALL_DEAD, -EEXIST);
376 trace_rxrpc_call(call->debug_id, rxrpc_call_error,
377 refcount_read(&call->ref), here, ERR_PTR(-EEXIST));
378 rxrpc_release_call(rx, call);
379 mutex_unlock(&call->user_mutex);
380 rxrpc_put_call(call, rxrpc_call_put);
381 _leave(" = -EEXIST");
382 return ERR_PTR(-EEXIST);
383
384 /* We got an error, but the call is attached to the socket and is in
385 * need of release. However, we might now race with recvmsg() when
386 * completing the call queues it. Return 0 from sys_sendmsg() and
387 * leave the error to recvmsg() to deal with.
388 */
389 error_attached_to_socket:
390 trace_rxrpc_call(call->debug_id, rxrpc_call_error,
391 refcount_read(&call->ref), here, ERR_PTR(ret));
392 set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);
393 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
394 RX_CALL_DEAD, ret);
395 _leave(" = c=%08x [err]", call->debug_id);
396 return call;
397 }
398
399 /*
400 * Set up an incoming call. call->conn points to the connection.
401 * This is called in BH context and isn't allowed to fail.
402 */
rxrpc_incoming_call(struct rxrpc_sock * rx,struct rxrpc_call * call,struct sk_buff * skb)403 void rxrpc_incoming_call(struct rxrpc_sock *rx,
404 struct rxrpc_call *call,
405 struct sk_buff *skb)
406 {
407 struct rxrpc_connection *conn = call->conn;
408 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
409 u32 chan;
410
411 _enter(",%d", call->conn->debug_id);
412
413 rcu_assign_pointer(call->socket, rx);
414 call->call_id = sp->hdr.callNumber;
415 call->service_id = sp->hdr.serviceId;
416 call->cid = sp->hdr.cid;
417 call->state = RXRPC_CALL_SERVER_SECURING;
418 call->cong_tstamp = skb->tstamp;
419
420 /* Set the channel for this call. We don't get channel_lock as we're
421 * only defending against the data_ready handler (which we're called
422 * from) and the RESPONSE packet parser (which is only really
423 * interested in call_counter and can cope with a disagreement with the
424 * call pointer).
425 */
426 chan = sp->hdr.cid & RXRPC_CHANNELMASK;
427 conn->channels[chan].call_counter = call->call_id;
428 conn->channels[chan].call_id = call->call_id;
429 rcu_assign_pointer(conn->channels[chan].call, call);
430
431 spin_lock(&conn->params.peer->lock);
432 hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets);
433 spin_unlock(&conn->params.peer->lock);
434
435 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
436
437 rxrpc_start_call_timer(call);
438 _leave("");
439 }
440
441 /*
442 * Queue a call's work processor, getting a ref to pass to the work queue.
443 */
rxrpc_queue_call(struct rxrpc_call * call)444 bool rxrpc_queue_call(struct rxrpc_call *call)
445 {
446 const void *here = __builtin_return_address(0);
447 int n;
448
449 if (!__refcount_inc_not_zero(&call->ref, &n))
450 return false;
451 if (rxrpc_queue_work(&call->processor))
452 trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1,
453 here, NULL);
454 else
455 rxrpc_put_call(call, rxrpc_call_put_noqueue);
456 return true;
457 }
458
459 /*
460 * Queue a call's work processor, passing the callers ref to the work queue.
461 */
__rxrpc_queue_call(struct rxrpc_call * call)462 bool __rxrpc_queue_call(struct rxrpc_call *call)
463 {
464 const void *here = __builtin_return_address(0);
465 int n = refcount_read(&call->ref);
466 ASSERTCMP(n, >=, 1);
467 if (rxrpc_queue_work(&call->processor))
468 trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n,
469 here, NULL);
470 else
471 rxrpc_put_call(call, rxrpc_call_put_noqueue);
472 return true;
473 }
474
475 /*
476 * Note the re-emergence of a call.
477 */
rxrpc_see_call(struct rxrpc_call * call)478 void rxrpc_see_call(struct rxrpc_call *call)
479 {
480 const void *here = __builtin_return_address(0);
481 if (call) {
482 int n = refcount_read(&call->ref);
483
484 trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n,
485 here, NULL);
486 }
487 }
488
rxrpc_try_get_call(struct rxrpc_call * call,enum rxrpc_call_trace op)489 bool rxrpc_try_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
490 {
491 const void *here = __builtin_return_address(0);
492 int n;
493
494 if (!__refcount_inc_not_zero(&call->ref, &n))
495 return false;
496 trace_rxrpc_call(call->debug_id, op, n + 1, here, NULL);
497 return true;
498 }
499
500 /*
501 * Note the addition of a ref on a call.
502 */
rxrpc_get_call(struct rxrpc_call * call,enum rxrpc_call_trace op)503 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
504 {
505 const void *here = __builtin_return_address(0);
506 int n;
507
508 __refcount_inc(&call->ref, &n);
509 trace_rxrpc_call(call->debug_id, op, n + 1, here, NULL);
510 }
511
512 /*
513 * Clean up the RxTx skb ring.
514 */
rxrpc_cleanup_ring(struct rxrpc_call * call)515 static void rxrpc_cleanup_ring(struct rxrpc_call *call)
516 {
517 int i;
518
519 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
520 rxrpc_free_skb(call->rxtx_buffer[i], rxrpc_skb_cleaned);
521 call->rxtx_buffer[i] = NULL;
522 }
523 }
524
525 /*
526 * Detach a call from its owning socket.
527 */
rxrpc_release_call(struct rxrpc_sock * rx,struct rxrpc_call * call)528 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
529 {
530 const void *here = __builtin_return_address(0);
531 struct rxrpc_connection *conn = call->conn;
532 bool put = false;
533
534 _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref));
535
536 trace_rxrpc_call(call->debug_id, rxrpc_call_release,
537 refcount_read(&call->ref),
538 here, (const void *)call->flags);
539
540 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
541
542 spin_lock_bh(&call->lock);
543 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
544 BUG();
545 spin_unlock_bh(&call->lock);
546
547 rxrpc_put_call_slot(call);
548 rxrpc_delete_call_timer(call);
549
550 /* Make sure we don't get any more notifications */
551 write_lock_bh(&rx->recvmsg_lock);
552
553 if (!list_empty(&call->recvmsg_link)) {
554 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
555 call, call->events, call->flags);
556 list_del(&call->recvmsg_link);
557 put = true;
558 }
559
560 /* list_empty() must return false in rxrpc_notify_socket() */
561 call->recvmsg_link.next = NULL;
562 call->recvmsg_link.prev = NULL;
563
564 write_unlock_bh(&rx->recvmsg_lock);
565 if (put)
566 rxrpc_put_call(call, rxrpc_call_put);
567
568 write_lock(&rx->call_lock);
569
570 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
571 rb_erase(&call->sock_node, &rx->calls);
572 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
573 rxrpc_put_call(call, rxrpc_call_put_userid);
574 }
575
576 list_del(&call->sock_link);
577 write_unlock(&rx->call_lock);
578
579 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
580
581 if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
582 rxrpc_disconnect_call(call);
583 if (call->security)
584 call->security->free_call_crypto(call);
585 _leave("");
586 }
587
588 /*
589 * release all the calls associated with a socket
590 */
rxrpc_release_calls_on_socket(struct rxrpc_sock * rx)591 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
592 {
593 struct rxrpc_call *call;
594
595 _enter("%p", rx);
596
597 while (!list_empty(&rx->to_be_accepted)) {
598 call = list_entry(rx->to_be_accepted.next,
599 struct rxrpc_call, accept_link);
600 list_del(&call->accept_link);
601 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET);
602 rxrpc_put_call(call, rxrpc_call_put);
603 }
604
605 while (!list_empty(&rx->sock_calls)) {
606 call = list_entry(rx->sock_calls.next,
607 struct rxrpc_call, sock_link);
608 rxrpc_get_call(call, rxrpc_call_got);
609 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET);
610 rxrpc_send_abort_packet(call);
611 rxrpc_release_call(rx, call);
612 rxrpc_put_call(call, rxrpc_call_put);
613 }
614
615 _leave("");
616 }
617
618 /*
619 * release a call
620 */
rxrpc_put_call(struct rxrpc_call * call,enum rxrpc_call_trace op)621 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
622 {
623 struct rxrpc_net *rxnet = call->rxnet;
624 const void *here = __builtin_return_address(0);
625 unsigned int debug_id = call->debug_id;
626 bool dead;
627 int n;
628
629 ASSERT(call != NULL);
630
631 dead = __refcount_dec_and_test(&call->ref, &n);
632 trace_rxrpc_call(debug_id, op, n, here, NULL);
633 if (dead) {
634 _debug("call %d dead", call->debug_id);
635 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
636
637 if (!list_empty(&call->link)) {
638 spin_lock_bh(&rxnet->call_lock);
639 list_del_init(&call->link);
640 spin_unlock_bh(&rxnet->call_lock);
641 }
642
643 rxrpc_cleanup_call(call);
644 }
645 }
646
647 /*
648 * Final call destruction - but must be done in process context.
649 */
rxrpc_destroy_call(struct work_struct * work)650 static void rxrpc_destroy_call(struct work_struct *work)
651 {
652 struct rxrpc_call *call = container_of(work, struct rxrpc_call, processor);
653 struct rxrpc_net *rxnet = call->rxnet;
654
655 rxrpc_delete_call_timer(call);
656
657 rxrpc_put_connection(call->conn);
658 rxrpc_put_peer(call->peer);
659 kfree(call->rxtx_buffer);
660 kfree(call->rxtx_annotations);
661 kmem_cache_free(rxrpc_call_jar, call);
662 if (atomic_dec_and_test(&rxnet->nr_calls))
663 wake_up_var(&rxnet->nr_calls);
664 }
665
666 /*
667 * Final call destruction under RCU.
668 */
rxrpc_rcu_destroy_call(struct rcu_head * rcu)669 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
670 {
671 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
672
673 if (in_softirq()) {
674 INIT_WORK(&call->processor, rxrpc_destroy_call);
675 if (!rxrpc_queue_work(&call->processor))
676 BUG();
677 } else {
678 rxrpc_destroy_call(&call->processor);
679 }
680 }
681
682 /*
683 * clean up a call
684 */
rxrpc_cleanup_call(struct rxrpc_call * call)685 void rxrpc_cleanup_call(struct rxrpc_call *call)
686 {
687 _net("DESTROY CALL %d", call->debug_id);
688
689 memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
690
691 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
692 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
693
694 rxrpc_cleanup_ring(call);
695 rxrpc_free_skb(call->tx_pending, rxrpc_skb_cleaned);
696
697 call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
698 }
699
700 /*
701 * Make sure that all calls are gone from a network namespace. To reach this
702 * point, any open UDP sockets in that namespace must have been closed, so any
703 * outstanding calls cannot be doing I/O.
704 */
rxrpc_destroy_all_calls(struct rxrpc_net * rxnet)705 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
706 {
707 struct rxrpc_call *call;
708
709 _enter("");
710
711 if (!list_empty(&rxnet->calls)) {
712 spin_lock_bh(&rxnet->call_lock);
713
714 while (!list_empty(&rxnet->calls)) {
715 call = list_entry(rxnet->calls.next,
716 struct rxrpc_call, link);
717 _debug("Zapping call %p", call);
718
719 rxrpc_see_call(call);
720 list_del_init(&call->link);
721
722 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
723 call, refcount_read(&call->ref),
724 rxrpc_call_states[call->state],
725 call->flags, call->events);
726
727 spin_unlock_bh(&rxnet->call_lock);
728 cond_resched();
729 spin_lock_bh(&rxnet->call_lock);
730 }
731
732 spin_unlock_bh(&rxnet->call_lock);
733 }
734
735 atomic_dec(&rxnet->nr_calls);
736 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
737 }
738